Filed Pursuant to Rule 424(b)(5)
Registration No. 333-255318
Prospectus Supplement
(To prospectus dated April 29, 2021)
10,130,000 Shares
Pre-Funded Warrants to Purchase up to
1,870,000 Shares
Warrants to Purchase up to 12,000,000
Shares
Common Stock
We are offering on a “reasonable best
efforts” basis 10,130,000 shares of our common stock, par value $0.0001
per share, pre-funded warrants to purchase up to 1,870,000 shares of
our common stock (and the shares of common stock issuable from time to time upon exercise of such pre-funded warrants) and warrants
to purchase up to 12,000,000 shares of our
common stock (and the shares of common stock issuable from time to time upon exercise of such warrants) pursuant to this prospectus
supplement and the accompanying prospectus. Each share of common stock sold in this offering will be accompanied by a warrant to
purchase one share of our common stock at an exercise price of $0.75 per share at a combined purchase price equal
to $0.75 per share and accompanying warrant. The shares of common stock (or pre-funded
warrants sold in lieu thereof) and the accompanying warrants can only be purchased together in this offering but will be issued
separately and will be immediately separable upon issuance.
We are offering pre-funded warrants in lieu of
shares of common stock to the investors whose purchase of shares of common stock in this offering would otherwise result in such investor,
together with its affiliates, beneficially owning more than 4.99% (or, at the election of the investor, 9.99%) of our common stock. Each
pre-funded warrant sold in this offering will be accompanied by a warrant to purchase one share of our common stock at an exercise price
of $0.75 per share at a combined purchase price equal to $0.7499 (equal to the purchase price per share of common stock, minus $0.0001). The per
share exercise price for the pre-funded warrants will be $0.0001, and the pre-funded warrants are immediately exercisable and may be exercised
at any time until all of the pre-funded warrants are exercised in full.
Subject to certain ownership limitations, the
warrants will be exercisable immediately, and the warrants will expire on the fifth anniversary of the initial exercise date. We refer
to the shares of common stock and the pre-funded warrants issued in this offering and the accompanying warrants to purchase shares of
common stock issued in this offering, collectively, as the securities.
Our common stock is currently trading on The
Nasdaq Capital Market, or Nasdaq, under the stock symbol “SLS.” On January 4, 2024, the closing price for our common
stock, as reported on Nasdaq, was $0.5816 per share.
There is no established public trading market
for the pre-funded warrants and the warrants and we do not expect a market to develop. In addition, we do not intend to list the pre-funded
warrants and the warrants, nor do we expect the pre-funded warrants and the warrants to be quoted, on Nasdaq or any other national securities
exchange or any other nationally recognized trading system. Without an active trading market, the liquidity of the pre-funded warrants
and the warrants will be limited.
Investing in our securities involves a high
degree of risk. See “Risk Factors” beginning on page S-6 of this prospectus supplement, as well as those risks described
in our most recent Annual Report on Form 10-K for the year ended December 31, 2022 and in our other filings with the Securities
and Exchange Commission that are incorporated by reference into this prospectus supplement.
Neither the Securities and Exchange Commission
nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement or the
accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.
We have engaged A.G.P./Alliance Global
Partners to act as our exclusive placement agent, or the Placement Agent, in connection with this offering. The Placement Agent is
not purchasing or selling any of the securities offered by this prospectus supplement and has no obligation to buy
any of the securities from us or to arrange for the purchase or sale of any specific number or dollar amount of securities. The Placement Agent has
agreed to use its reasonable best efforts to sell the securities offered by this prospectus supplement. We have agreed to pay the
Placement Agent a fee based on the aggregate proceeds raised in this offering as set forth in the table below:
| |
Per Share and Accompanying Warrant (1) | | |
Per Pre-Funded Warrant and Accompanying Warrant (1) | | |
Total | |
Public offering price | |
$ | 0.7500 | | |
$ | 0.7499 | | |
$ | 8,999,813.00 | |
Placement Agent Fees (2) | |
$ | 0.0525 | | |
$ | 0.0525 | | |
$ | 629,986.91 | |
Proceeds to SELLAS Life Sciences Group, Inc., before expenses | |
$ | 0.6975 | | |
$ | 0.6974 | | |
$ | 8,369,826.09 | |
(1) Includes $0.01 per warrant for the accompanying warrants.
(2) In addition, we have agreed to reimburse certain expenses
of the placement agent in connection with the offering. See “Plan of Distribution” for additional disclosure regarding placement
agent’s compensation.
Delivery of the securities being offered
pursuant to this prospectus supplement and the accompanying prospectus is expected to be made on or about January 8, 2024.
Sole Placement Agent
A.G.P.
The date of this prospectus supplement is January 4,
2024
TABLE OF CONTENTS
Prospectus supplement
Prospectus
ABOUT THIS PROSPECTUS SUPPLEMENT
This document is in two parts. The first part
is this prospectus supplement, which describes the terms of this offering of securities and also adds to and updates information contained
in the accompanying prospectus and the documents incorporated by reference into this prospectus supplement and the accompanying prospectus.
The second part, the accompanying prospectus dated April 29, 2021, including the documents incorporated by reference therein, provides
more general information. Generally, when we refer to this prospectus, we are referring to both parts of this document combined. To the
extent there is a conflict between the information contained in this prospectus supplement, on the one hand, and the information contained
in the accompanying prospectus or in any document incorporated by reference that was filed with the Securities and Exchange Commission,
or the SEC, before the date of this prospectus supplement, on the other hand, you should rely on the information in this prospectus supplement.
If any statement in one of these documents is inconsistent with a statement in another document having a later date—for example,
a document incorporated by reference in the accompanying prospectus—the statement in the document having the later date modifies
or supersedes the earlier statement.
This prospectus supplement is part of a registration
statement that we filed with the SEC using a “shelf” registration process. Under the shelf registration process, we may from
time to time offer and sell any combination of the securities described in the accompanying prospectus up to a total dollar amount of
$150 million, of which this offering is a part.
The distribution of this prospectus supplement
and the accompanying prospectus and the offering of our securities in certain jurisdictions may be restricted by law. We are not, and
the placement agent is not, making an offer of these securities in any jurisdiction where the offer is not permitted. Persons who come
into possession of this prospectus supplement and the accompanying prospectus should inform themselves about and observe any such restrictions.
This prospectus supplement and the accompanying prospectus do not constitute, and may not be used in connection with, an offer or solicitation
by anyone in any jurisdiction in which such offer or solicitation is not authorized or in which the person making such offer or solicitation
is not qualified to do so or to any person to whom it is unlawful to make such offer or solicitation.
You should rely only on the information contained
in or incorporated by reference in this prospectus supplement, the accompanying prospectus, and any free writing prospectus prepared by
or on behalf of us or to which we have referred you. We have not, and the placement agent has not, authorized any person to provide you
with any information or to make any representation other than as contained in this prospectus supplement or in the accompanying prospectus
and the information incorporated by reference herein and therein. We and the placement agent do not take any responsibility for, and can
provide no assurance as to the reliability of, any information that others may provide you. The information appearing or incorporated
by reference in this prospectus supplement and the accompanying prospectus is accurate only as of the date of this prospectus supplement
or the date of the document in which incorporated information appears unless otherwise noted in such documents. Our business, financial
condition, results of operations and prospects may have changed since those dates. You should assume that the information appearing in
this prospectus supplement, the accompanying prospectus, and the documents incorporated by reference herein and therein is accurate only
as of the date of those respective documents. Our business, financial condition, results of operations and prospects may have changed
since those dates. You should carefully read this entire prospectus supplement and the accompanying prospectus, including the information
included and referred to under “Risk Factors” below, the information incorporated by reference in this prospectus supplement
and in the accompanying prospectus, and the financial statements and the other information incorporated by reference in the accompanying
prospectus, before making an investment decision.
Except as otherwise indicated herein or as the
context otherwise requires, references in this prospectus supplement, the accompanying prospectus and the information incorporated by
referenced herein or therein to “Sellas,” “the Company,” “we,” “us,” “our”
and similar terms refer to SELLAS Life Sciences Group, Inc. and, where appropriate, our subsidiaries.
PROSPECTUS SUPPLEMENT SUMMARY
This summary highlights information contained
elsewhere or incorporated by reference in this prospectus supplement. This summary does not contain all of the information you should
consider before investing in our securities. Before you decide to invest in our securities, you should carefully read the prospectus supplement
and the accompanying prospectus, including the section titled “Risk factors” contained in this prospectus supplement, the
accompanying prospectus and in the documents incorporated by reference into this prospectus supplement. You should also carefully read
the information incorporated by reference into this prospectus supplement and the accompanying prospectus, including our consolidated
financial statements, and the exhibits to the registration statement of which this prospectus supplement and the accompanying prospectus
are a part.
Overview
We are a late-stage clinical biopharmaceutical company focused on the
development of novel therapeutics for a broad range of cancer indications. Our product candidates currently include galinpepimut-S, or
GPS, a peptide immunotherapy directed against the Wilms tumor 1, or WT1, antigen, and SLS009 (formerly GFH009), a highly selective small
molecule cyclin-dependent kinase 9, or CDK9, inhibitor.
Galinpepimut-S
Our lead product candidate, GPS, is a cancer immunotherapeutic agent
licensed from Memorial Sloan Kettering Cancer Center, or MSK, that targets the WT1 protein, which is present in 20 or more cancer types.
Based on its mechanism of action as a directly immunizing agent, GPS has potential as a monotherapy or in combination with other immunotherapeutic
agents to address a broad spectrum of hematologic, or blood, cancers and solid tumor indications.
In January 2020, we commenced in the
United States an open label randomized Phase 3 clinical trial, the REGAL study, for GPS monotherapy in patients with acute myeloid
leukemia, or AML, in the maintenance setting after achievement of second complete remission, or CR2, following successful completion
of second-line antileukemic therapy. Patients are randomized (1:1) to receive either GPS or best available treatment, or BAT. We
expect this study will be used as the basis for submission of a Biologics License Application, or BLA, subject to a statistically
significant and clinically meaningful data outcome and agreement with the U.S. Food and Drug Administration, or the FDA. The primary
endpoint of the clinical trial is overall survival. We plan to enroll approximately 125 to 140 patients at approximately 95 clinical
sites in North America, Europe and Asia with a planned interim safety, efficacy and futility analysis after 60 events (deaths). The
Company completed our target enrollment in the REGAL study, other than the 20-25 patients anticipated to be enrolled in China, in
November 2023 and is continuing to enroll patients in the United States, Europe and Asia to reach 126 patients, per the statistical analysis plan, for
full enrollment in the first quarter of 2024. Under our current assumptions with respect to completion of enrollment and the estimated survival times for
both the treated and control groups in the study, we believe, after previous discussions with our external statisticians and
experts, that the planned interim analysis after 60 events (deaths) per the protocol will occur in the first quarter of 2024 and the
final analysis after 80 events will occur by the end of 2024. It is important to note that because these analyses are event driven,
they may occur at a different time than currently expected.
In December 2020, we entered into an
exclusive license agreement, or 3DMed License Agreement, with 3D Medicines Inc., or 3D Medicines, a China-based biopharmaceutical
company developing next-generation immuno-oncology drugs, for the development and commercialization of GPS, as well as the
Company’s next generation heptavalent immunotherapeutic GPS+, which is at preclinical stage, across all therapeutic and
diagnostic uses in mainland China, Hong Kong, Macau and Taiwan, which we refer to, collectively, as Greater China or the 3DMed
Territory. We have retained sole rights to GPS and GPS+ outside of Greater China. In November 2022, we announced that we had
agreed with 3D Medicines for 3D Medicines to participate in the REGAL study through the inclusion of approximately 20-25 patients
from mainland China. We had expected that 3D Medicines would have begun enrolling patients in mainland China in the second half of
2023 and subsequently make two development milestone payments totaling $13.0 million. However, on December 22, 2023 we
announced that we and 3D Medicines are currently engaged in a dispute regarding, among other things, the trigger and payment of the
relevant milestone payments due to the Company as well as 3D Medicines’ failure to use commercially reasonable best efforts to
develop GPS in the 3D Med Territory, and particularly in mainland China. Over the last three to four months, we have attempted to
resolve the aforementioned matters in good faith under the dispute resolution provisions of the 3D Med License Agreement but have
been unable to reach a resolution. Accordingly, we have commenced a binding arbitration proceeding administered by the Hong Kong
International Arbitration Centre governed by New York State law as per the 3DMed License Agreement. As of September 30, 2023,
we have received an aggregate of $10.5 million in upfront and milestone payments under our license agreement with 3D Medicines and a
total of $191.5 million in potential future development, regulatory and sales milestones, not including future royalties, remains
under the license agreement, which milestones are variable in nature and not under our control.
In December 2018, pursuant to a
Clinical Trial Collaboration and Supply Agreement, we initiated a Phase 1/2 multi-arm "basket" type clinical study of GPS
in combination with Merck & Co., Inc.’s anti-PD-1 therapy, pembrolizumab (Keytruda). In 2020, we, together with
Merck, determined to focus on ovarian cancer (second or third line). In November 2022, we reported topline clinical and initial
immune response data from this study, which showed that treatment with the combination of GPS and pembrolizumab compared favorably
to treatment with anti-PD-1 therapy alone in a similar patient population. In November 2023, positive
immunobiological and clinical data from the completed Phase 1/2 clinical trial was presented at the International Gynecologic Cancer
Society 2023 annual global meeting.
In February 2020, a Phase 1 open-label investigator-sponsored
clinical trial of GPS, in combination with Bristol-Myers Squibb’s anti-PD-1 therapy, nivolumab (Opdivo), in patients with malignant
pleural mesothelioma, or MPM, who harbor relapsed or refractory disease after having received frontline standard of care multimodality
therapy was commenced at MSK. Enrollment of a target total of 10 evaluable patients was completed at the end of 2022. In June 2023,
we reported that the primary endpoint of safety and the efficacy endpoint were both met with clinical activity and increased survival
in this study. In December 2023, we reported positive follow-up immune response and survival data.
GPS was granted Orphan Drug Product Designations, or ODD, from the
FDA, as well as Orphan Medicinal Product Designations from the European Medicines Agency, or EMA, for GPS in AML, MPM, and multiple myeloma,
or MM, as well as Fast Track Designation for AML, MPM, and MM from the FDA.
SLS009: Highly Selective Next Generation CDK9 Inhibitor
On March 31, 2022, we entered into an exclusive license agreement,
or the SLS009 Agreement, with GenFleet Therapeutics (Shanghai), Inc., or GenFleet, a clinical-stage biotechnology company developing
cutting-edge therapeutics in oncology and immunology, that grants rights to us for the development and commercialization of SLS009, a
highly selective small molecule CDK9 inhibitor, across all therapeutic and diagnostic uses worldwide, except for Greater China.
CDK9 activity has been shown to correlate negatively with overall survival
in a number of cancer types, including hematologic cancers, such as AML and lymphomas, as well as solid cancers, such as osteosarcoma,
pediatric soft tissue sarcomas, melanoma, endometrial, lung, prostate, breast and ovarian. As demonstrated in preclinical and clinical
data, to date, SLS009’s high selectivity has the potential to reduce toxicity as compared to older CDK9 inhibitors and other next-generation
CDK9 inhibitors currently in clinical development and to potentially be more efficacious.
In the second quarter of 2023, we announced the completion of the safety
evaluation stage of the highest dose cohort of patients with AML who relapsed after or were refractory to available antileukemic therapies
in our Phase 1 dose escalation clinical trial of SLS009 as well as positive topline data, and that the recommended Phase 2 dose, or RP2D,
in AML, was established and submitted to the U.S. Food and Drug Administration. Anti-tumor activity and clinical responses across dose levels were observed, indicating a broad therapeutic index. Meaningful cell killing
activity, defined as ≥50% reduction in blasts in the bone marrow, was observed at several dose levels. A durable complete remission,
or CR),with no minimal residual disease was observed in one patient with AML who had failed prior venetoclax plus azacytidine, or aza/ven,
therapy. The patient continued to be alive 11 months following commencement of treatment per last follow-up.
In June 2023, we announced that the first patient was dosed (45
mg) in a Phase 2a clinical trial with SLS009 in combination with aza/ven in patients with AML who relapsed
after or are refractory to treatment with venetoclax-based therapies. The trial is an open label, single arm, multi-center study that
is designed to evaluate safety, tolerability, and efficacy at two dose levels of SLS009 (once weekly 45 mg or 60 mg) in combination with
aza/ven. In addition to safety and tolerability of SLS009 in combination with aza/ven, the primary endpoints are complete response composite
rate and duration of response. Additional endpoints include event free survival, overall survival, and pharmacokinetic and pharmacodynamic
assessments. The trial includes several sites in the United States and, based on initial results, may be expanded into a registrational
trial. Enrollment in the 45 mg cohort was completed in the fourth quarter of 2023. Also in the fourth quarter we announced the dosing
of the first patients in the 60 mg dose cohort. The patients in the 60 mg dose cohort will be dosed with 60 mg once per week or 30 mg
twice per week. Early topline data for the patients dosed at the 45 mg level (n=9) include one patient with a complete response (CR) while
significant anti-leukemic effects (≥50% decrease in bone marrow blasts) were observed in five out of six assessable patients with no
significant safety issues to date.
Initial data for the recommended Phase 2 dose (60mg) is expected in
the first quarter of 2024.
In September 2023, we announced positive topline data for the
patient group with relapsed/refractory (r/r) lymphomas from the Phase 1 dose-escalation trial of SLS009 as well as the RP2D of 100 mg
for this patient population. All primary and secondary study objectives, including safety, clinical activity, pharmacokinetics (PK), and
pharmacodynamics (PD), were successfully achieved for the group of patients with lymphomas. In October 2023, we announced that our
partner, GenFleet, dosed the first patient in a Phase 1b/2 trial evaluating SLS009 in relapsed/refractory Peripheral T-cell Lymphomas,
or PTCL. The open-label, single-arm trial will enroll up to 95 patients to evaluate safety and efficacy and, based on the results, may
serve as a registrational study. This initial PTCL study is fully funded by GenFleet and is being conducted in China.
SLS009 is also currently being evaluated in pediatric solid tumors
and leukemia models through the NCI Pediatric Preclinical in Vivo Testing, or PIVOT, program. Studies are supported through cooperative
agreement grants from the NCI to the seven PIVOT research programs performing the PK and efficacy testing in pediatric tumors and a centralized
coordinating center. Preclinical data are scheduled to be generated continuously through the first half of 2024.
In October 2023, we announced that SLS009 was granted ODD for
AML and Fast Track Designation for PTCL by the FDA. In December 2023, we announced that SLS009 was granted ODD for PTCL.
Corporate information
We were incorporated on April 3, 2006 in
Delaware as Argonaut Pharmaceuticals, Inc. On November 28, 2006, we changed our name to RXi Pharmaceuticals Corporation and
began operations January 2007. On September 26, 2011, we changed our name to Galena Biopharma, Inc. In December 2017,
we completed a business combination with SELLAS Life Sciences Group, Ltd., and changed our name to “SELLAS Life Sciences Group, Inc.”
Our principal executive offices are located at
7 Times Square, Suite 2503, New York, NY 10036, and our phone number is (646) 200-5278. Our website address is www.sellaslifesciences.com.
The information contained on, or that can be accessed through, our website is not part of, and is not incorporated by reference into,
this prospectus and should not be considered to be part of this prospectus.
Smaller reporting company
We are a “smaller reporting company”
as defined in the Securities Exchange Act of 1934, as amended, or the Exchange Act. We may take advantage of certain of the scaled disclosures
available to smaller reporting companies and will be able to take advantage of these scaled disclosures for so long as our voting and
non-voting common stock held by non-affiliates is less than $250.0 million measured on the last business day of our second fiscal quarter,
or our annual revenue is less than $100.0 million during the most recently completed fiscal year and our voting and non-voting common
stock held by non-affiliates is less than $700.0 million measured on the last business day of our second fiscal quarter.
THE OFFERING
Common stock offered by us |
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10,130,000 shares of common stock. |
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Pre-Funded Warrants offered by us |
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We are offering pre-funded warrants to purchase an aggregate of 1,870,000
shares of our common stock in lieu of shares of common stock to certain
investors whose purchase of shares of common stock in this offering would otherwise result in the investor, together with its
affiliates, beneficially owning more than 4.99% (or, at the election of the purchaser, 9.99%) of our outstanding common stock
immediately following the consummation of this offering. The purchase price of each pre-funded warrant is equal to the price at
which a share of common stock is sold to the public in this offering, minus $0.0001, and the exercise price of each pre-funded
warrant is $0.0001 per share. Each pre-funded warrant will be exercisable immediately and may be exercised at any time until all of
the pre-funded warrants are exercised in full. This prospectus supplement and accompanying prospectus also relate to the
offering of the shares of common stock issuable upon exercise of the pre-funded warrants. For additional information regarding the
warrants, see “Description of Capital Stock—Pre-Funded Warrants” below. |
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Warrants offered by us |
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We are offering warrants
to purchase an aggregate of 12,000,000 shares of our common stock. Each share of our
common stock is being sold together with a warrant to purchase one share of our common stock. Each warrant has an exercise price of
$0.75 per share, is immediately exercisable and will expire on the five
year anniversary of the date of issuance. This prospectus supplement also relates to the offering of the shares of common stock
issuable upon exercise of the warrants. There is no established public trading market for the warrants being offered in this
offering, and we do not expect a market to develop. In addition, we do not intend to apply for a listing of the warrants on any
securities exchange. Without an active market, the liquidity of the warrants will be limited. This prospectus supplement and
accompanying prospectus also relate to the offering of the shares of common stock issuable upon exercise of the warrants. For
additional information regarding the warrants, see “Description of Capital Stock—Warrants” below. |
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Common stock to be outstanding immediately after this offering |
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38,523,958 shares of common stock assuming no exercise of any pre-funded warrants or warrants issued
in this offering. |
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Best Efforts |
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We have agreed to issue and sell the securities offered hereby to the purchasers through the Placement Agent, and the Placement Agent has agreed to offer and sell such securities on a “reasonable best efforts” basis. The Placement Agent is not required to sell any specific number or dollar amount of the securities offered hereby, but will use its reasonable best efforts to sell such securities. See the section entitled “Plan of Distribution” on page S-29 of this prospectus supplement. |
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Use of proceeds |
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We estimate that our net
proceeds from this offering will be approximately $8.2
million, after deducting placement agent’s fees
and estimated offering expenses payable by us and assuming no exercise of the pre-funded warrants and the warrants. |
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The principal purposes of this offering are to obtain additional capital to support our operations. We expect to use the net proceeds of this offering, in addition to our existing cash resources, for funding of ongoing operations, including clinical development of the product candidates noted in this prospectus supplement, and for working capital and other general corporate purposes. See “Use of proceeds” for additional information. |
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Risk factors |
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See “Risk factors” beginning on page S-6 of this prospectus supplement and other information included and incorporated by reference in this prospectus supplement and the accompanying prospectus for a discussion of factors that you should carefully consider before deciding to invest in our securities. |
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Market symbol |
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Our common stock currently is listed on Nasdaq under the symbol “SLS.”
We do not intend to list the warrants or pre-funded warrants, nor do we expect the warrants or pre-funded to be quoted, on the Nasdaq
or any other national securities exchange or any other nationally recognized trading system. |
Upon completion of this offering, we will
take such steps as are necessary to (i) reduce the exercise price of an aggregate of 3,863,851
warrants that were issued on April 5, 2022 to certain investors
participating in this offering to $0.75, the combined purchase price, (ii) reduce the exercise price
of an aggregate of 3,652,300 warrants that were issued on November 2, 2023 to a certain investor participating in this offering to
$0.75, the combined purchase price, and (iii) extend the termination date of such warrants
to January 8, 2029.
The number of shares of our common stock to be
outstanding after this offering set forth above is based on 28,393,958 shares of our common stock outstanding as of September 30,
2023 and excludes:
| · | 1,643,070 shares of our common stock issuable upon the exercise of stock options outstanding as of September 30, 2023, at a weighted-average
exercise price of $5.87 per share; |
| · | 432,986 shares of common stock issuable upon the vesting and settlement of restricted stock units (“RSUs”) outstanding
as of September 30, 2023; |
| · | 12,221,059 shares of our common stock issuable upon the exercise of warrants outstanding as of September 30, 2023, at a weighted-average
exercise price of $3.31 per share; |
| · | 3,904,661 shares of our common stock reserved for future issuance under our 2023 Amended and Restated Equity Incentive Plan (the “2023
Plan”) as of September 30, 2023; |
| · | 183,457 shares of our common stock reserved for future issuance under our 2021 Employee Stock Purchase Plan (the “2021 Employee
Plan”) as of September 30, 2023; |
| · | 3,100,000 shares of our common stock and 552,300 pre-funded warrants
exercisable for shares of our common stock, together with accompanying warrants to purchase an aggregate of 3,652,300 shares of our common
stock at an exercise price of $0.9702 per share, which were issued after September 30, 2023 in a registered direct offering completed
by us on November 2, 2023 (the “November 2023 Registered Direct Offering”); and |
| · | 16,000 shares of our common stock issued under our Controlled Equity Offering SM Sales
Agreement (the “Sales Agreement”) with Cantor Fitzgerald & Co. after September 30, 2023 until the date of
this Prospectus Supplement. |
Unless otherwise indicated, all information in
this prospectus supplement assumes no exercise of the outstanding options and warrants described above after September 30, 2023 and
no sale of the pre-funded warrants and no exercise of the warrants issued in this offering.
RISK FACTORS
Investing in our securities involves a high
degree of risk. Before making an investment decision, you should carefully consider the risks described below and in our most recent Annual
Report on Form 10-K for the year ended December 31, 2022, as updated or superseded by the risks and uncertainties described
in our subsequent filings under the Exchange Act, each of which is incorporated by reference into this prospectus supplement and the accompanying
prospectus, and all of the other information in this prospectus supplement and the accompanying prospectus, including our financial statements
and related notes incorporated by reference in this prospectus supplement and the accompanying prospectus. If any of these risks is realized,
our business, financial condition, results of operations and prospects could be harmed. In that event, the trading price of our common
stock could decline and you could lose part or all of your investment. Additional risks and uncertainties that are not yet identified
or that we think are immaterial may also harm our business, operating results and financial condition and could result in a complete loss
of your investment.
Risks related to this offering
We have broad discretion in the use of the
net proceeds from this offering and may not use them effectively.
Our management will have broad discretion in the
application of the net proceeds from this offering and could spend the net proceeds in ways that do not improve our results of operations
or enhance the value of our common stock. Furthermore, you will not have the opportunity as part of your investment decision to assess
whether such proceeds are being used appropriately. Because of the number and variability of factors that will determine our use of our
cash and cash equivalents, including the net proceeds from this offering, their ultimate use may vary substantially from their currently
intended use. The failure by our management to apply these funds effectively could result in financial losses that could have a material
adverse effect on our business, cause the price of our common stock to decline and delay the development of our drug candidates. Pending
their use, we may invest the net proceeds from this offering in short-term, investment-grade, interest-bearing instruments, which may
not yield a favorable return to our stockholders.
If you purchase securities in this offering,
you will suffer immediate dilution of your investment.
We expect that the combined public offering
price of our common stock and the accompanying warrant in this offering will be higher than the net tangible book deficit per share of
our common stock. Therefore, if you purchase shares of our common stock and accompanying warrants in this offering, you will pay a
price per share and accompanying warrant that substantially exceeds our net tangible book deficit per share after this offering. Based
on the public offering price of $0.75 per share and accompanying warrant, our as adjusted net tangible book value as of
September 30, 2023 would have been $5.9 million, or $0.14 per share, resulting in an immediate increase in the net tangible
book deficit per share of $0.21 to existing stockholders and an immediate
dilution of $0.61 in the net tangible book deficit per share to investors purchasing common
stock in this offering, representing the difference between our as adjusted net tangible book value per share after giving effect to
this offering and the assumed public offering price. To the extent outstanding stock options or warrants are exercised, there will
be further dilution to new investors. See “Dilution.”
You may experience future dilution as a
result of future equity offerings.
In order to raise additional capital, we expect
to offer additional shares of our common stock or other securities convertible into or exchangeable for our common stock in the future.
We cannot assure you that we will be able to sell shares or other securities in any other offering at a price that is equal to or greater
than the price per share and accompanying warrant paid by investors in this offering, and investors purchasing shares or other securities
in the future could have rights superior to existing stockholders. The price at which we sell additional shares of our common stock or
other securities convertible into or exchangeable for our common stock in future transactions may be higher or lower than the price per
share and accompanying warrant in this offering.
We do not intend to pay dividends on our
common stock so any returns will be limited to the value of our stock.
You should not rely on an investment in our common
stock to provide dividend income. We do not anticipate that we will pay any cash dividends to holders of our common stock in the foreseeable
future. Instead, we plan to retain any earnings to maintain and expand our operations. Accordingly, investors must rely on sales of their
common stock after price appreciation, which may never occur, as the only way to realize any return on their investment. As a result,
investors seeking cash dividends should not purchase our common stock.
The market price and trading volume of shares
of our common stock may be volatile.
The market price of shares of our common stock
has exhibited substantial volatility. Between January 3, 2023 and January 3, 2024, the daily closing price of shares of our
common stock as reported on Nasdaq ranged from a low of $0.88 to a high of $3.86. The market price of shares of our common stock could
continue to fluctuate significantly for many reasons, including the following factors:
| · | reports of the results of our clinical trials regarding the safety or efficacy of our product candidates
and surrogate markers; |
| · | announcements of regulatory developments or technological innovations by us or our competitors; |
| · | announcements of business or strategic transactions or our success in finalizing such a transaction; |
| · | announcements of legal or regulatory actions against us or any adverse outcome of any such actions; |
| · | changes in our relationships with our licensors, licensees and other strategic partners; |
| · | low volume in the number of shares of our common stock traded on Nasdaq; |
| · | our quarterly or annual operating results; |
| · | announcements of dilutive financing; |
| · | announcements of additional potential reverse stock splits; |
| · | developments in patent or other technology ownership rights; |
| · | additional funds may not be available on terms that are favorable to us and, in the case of equity financings,
may result in dilution to our stockholders; |
| · | government regulation of drug pricing; and |
| · | general changes in the economy, the financial markets or the pharmaceutical or biotechnology industries. |
Factors beyond our control may also have an impact
on the market price of shares of our common stock. For example, to the extent that other companies within our industry experience declines
in their stock prices, the market price of shares of our common stock may decline as well.
Sales of a substantial number of shares
of our common stock by our existing shareholders in the public market or the exercise of common stock warrants could cause our stock price
to fall.
If our existing shareholders sell, or indicate
an intention to sell, substantial amounts of our common stock in the public market or exercise, or indicate an intention to exercise,
substantial amounts of warrants of our common stock in the public market, the trading price of our common stock could decline. In addition,
a substantial number of shares of common stock are subject to outstanding options or will become eligible for sale in the public market
to the extent permitted by the provisions of various vesting schedules. If these additional shares of common stock are sold, or if it
is perceived that they will be sold, in the public market, the trading price of our common stock could decline.
We and our executive officers and directors
have agreed for a period of 60 days from the date of this prospectus supplement, without the prior written consent of the purchaser
party to the securities purchase agreement, with certain limited exceptions, not to offer, pledge, sell, contract to sell, or
otherwise dispose of any shares of our common stock. The lock-up provisions apply to common stock and to securities convertible into
or exchangeable or exercisable for common stock. They also apply to common stock owned now or acquired later by the person executing
the lock-up agreement or for which the person executing the lock-up agreement later acquires the power of disposition.
This offering is being conducted on a “reasonable
best efforts” basis.
The Placement Agent is offering the shares on
a “reasonable best efforts” basis, and the Placement Agent is under no obligation to purchase any shares for its own account.
The Placement Agent is not required to sell any specific number or dollar amount of shares of common stock in this offering but will use
its best efforts to sell the securities offered in this prospectus supplement. As a “reasonable best efforts” offering, there
can be no assurance that the offering contemplated hereby will ultimately be consummated.
Purchasers who
purchase our securities in this offering pursuant to a securities purchase agreement may have rights not available to purchasers that
purchase without the benefit of a securities purchase agreement.
In addition to rights
and remedies available to all purchasers in this offering under federal securities and state law, the purchasers that enter into a securities
purchase agreement will also be able to bring claims of breach of contract against us. The ability to pursue a claim for breach of contract
provides those investors with the means to enforce the covenants uniquely available to them under the securities purchase agreement.
Risks related to the warrants
There is no public market for the warrants
to purchase shares of our common stock being offered in this offering.
There is no established public trading market
for the warrants being offered in this offering, and we do not expect a market to develop. In addition, we do not intend to apply to list
the warrants on any national securities exchange or other nationally recognized trading system, including the Nasdaq. Without an active
market, the liquidity of the warrants will be limited.
Holders of our warrants will have no rights
as a common stockholder until they acquire our common stock.
Until you acquire shares of our common stock upon
exercise of the warrants, you will have no rights with respect to shares of our common stock issuable upon exercise of the warrants. Upon
exercise of your warrants, you will be entitled to exercise the rights of a common stockholder only as to matters for which the record
date occurs after the exercise date.
The warrants are speculative in nature.
The warrants offered hereby do not confer
any rights of common stock ownership on their holders, such as voting rights or the right to receive dividends, but rather merely
represent the right to acquire shares of common stock at a fixed price. Specifically, commencing on the date of issuance, holders of
the warrants may acquire the common stock issuable upon exercise of such warrants at an exercise price of $0.75 per share. Moreover,
following this offering, the market value of the warrants is uncertain and there can be no assurance that the market value of the
warrants will equal or exceed their public offering price. There can be no assurance that the market price of the common stock will
ever equal or exceed the exercise price of the warrants and consequently, whether it will ever be profitable for holders of the
warrants to exercise the warrants.
Risks related to the pre-funded warrants
We do not intend to apply for any listing
of the pre-funded warrants on any exchange or nationally recognized trading system, and we do not expect a market to develop for the pre-funded
warrants.
We do not intend to apply for any listing of
the pre-funded warrants on the Nasdaq Capital Market or any other securities exchange or nationally recognized trading system, and
we do not expect a market to develop for the pre-funded warrants. Without an active market, the liquidity of the pre-funded warrants
will be limited. Further, the existence of the pre-funded warrants may act to reduce both the trading volume and the trading price
of our common stock.
Except as otherwise provided in the pre-funded
warrants, holders of pre-funded warrants purchased in this offering will have no rights as stockholders of common stock until such holders
exercise their warrants or pre-funded warrants and acquire our common stock.
The pre-funded warrants offered in this offering
do not confer any rights of common stock ownership on their holders, such as voting rights or the right to receive dividends, but rather
merely represent the right to acquire shares of our common stock at a fixed price. A holder of a pre-funded warrant may exercise the right
to acquire a share of common stock and pay a nominal exercise price of $0.0001 at any time. Upon exercise of the pre-funded warrants,
the holders thereof will be entitled to exercise the rights of a holder of common stock only as to matters for which the record date occurs
after the exercise date.
In certain circumstances, we may be required
to settle the value of the pre-funded warrants in cash.
If, at any time while the pre-funded warrants
are outstanding, we enter into a “Fundamental Transaction” (as defined in the pre-funded warrants), which includes, but is
not limited to, a purchase offer, tender offer or exchange offer, a stock or share purchase agreement or other business combination (including,
without limitation, a reorganization, recapitalization, spin-off or other scheme of arrangement), then each registered holder of outstanding
pre-funded warrants as at any time concurrently shall have the right to receive, for each share underlying the pre-funded warrants that
would have been issuable upon such exercise immediately prior to the occurrence of such Fundamental Transaction, at the option of the
holder, the number of shares of common stock of the successor or acquiring corporation or of the Company.
We may not receive any additional funds
upon the exercise of the pre-funded warrants.
Each pre-funded warrant may be exercised by way
of a cashless exercise, meaning that the holder may not pay a cash purchase price upon exercise, but instead would receive upon such exercise
the net number of shares of our common stock determined according to the formula set forth in the pre-funded warrant. Accordingly, we
may not receive any additional funds upon the exercise of the pre-funded warrants.
Risks related to our common stock
Our failure to meet the continued listing
requirements of The Nasdaq Capital Market could result in a delisting of our common stock.
Our shares of common stock are currently listed
on The Nasdaq Capital Market. If we fail to satisfy the continued listing requirements of Nasdaq, such as the corporate
governance requirements, minimum bid price requirement or the minimum stockholder’s equity requirement, The Nasdaq Stock
Market LLC may take steps to delist our common stock. A delisting of our common stock from The Nasdaq Capital Market could materially
reduce the liquidity of our common stock and result in a corresponding material reduction in the price of our common stock. In addition,
delisting could harm our ability to raise capital through alternative financing sources on terms acceptable to us, or at all, and may
result in the potential loss of confidence by investors, suppliers, customers and employees and fewer business development opportunities.
On December 6, 2023, we received a letter
from Nasdaq notifying us that we no longer meet Nasdaq’s requirements for continued listing on The Nasdaq Capital Market under Nasdaq
Listing Rule 5550(b)(2), or the MVLS Rule, because, for a period of 30 consecutive business days, the market value of our common
stock, calculated based upon the most recent total shares outstanding multiplied by the closing bid price per share, has not maintained
a minimum of $35.0 million.
The letter does not impact our listing on The
Nasdaq Capital Market at this time, and our common stock currently remains listed on The Nasdaq Capital Market under the symbol SLS.
In accordance with Nasdaq Listing Rule 5810(c)(3)(C),
we have been provided a period of 180 calendar days, or until June 3, 2024, in which to regain compliance with the MVLS Rule. To
regain compliance, the market value of our common stock must meet or exceed $35.0 million for a minimum of 10 consecutive business days
during the 180-day compliance period. If we have not regained compliance with the MVLS Rule by June 3, 2024, Nasdaq will provide
notice to us that our securities will be subject to delisting, in which case we may appeal the delisting determination to a Nasdaq Hearings
Panel.
Risks related to our financial position and capital needs
Price protection provisions attached to our common stock purchase
warrants issued on February 28, 2023 (the “February 2023 Warrants”) reduced the amount of capital we will receive upon exercise
of such February 2023 Warrants and may also result in dilution to our stockholders.
Pursuant to the terms of the February 2023 Warrants, the exercise price
will reset to $0.75 (the “Adjusted Exercise Price”) on the date of the closing of this offering and shall be further subject to
adjustment as provided in the February 2023 Warrants. The exercise price of the February 2023 Warrants is further subject to appropriate
adjustment in the event of certain stock dividends and distributions, stock splits, stock combinations, reclassifications or similar events
affecting the common stock. Holders of February 2023 Warrants are entitled to exercise their February 2023 Warrants at the Adjusted Exercise
Price.
Because these price protection provisions lowered the price at which
shares of our common stock will be issued upon exercise of the February 2023 Warrants, if such February 2023 Warrants are exercised for
cash, we will receive reduced proceeds. Such reduction in proceeds may have an adverse effect on our future working capital requirements.
Stockholders may also experience dilution as a result of the additional shares of common stock issuable upon exercise of the February
2023 Warrants at the Adjusted Exercise Price if such February 2023 Warrants are exercised.
SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS
This prospectus supplement, the accompanying prospectus
and the documents incorporated by reference herein and therein contain forward-looking statements within the meaning of Section 27A
of the Securities Act of 1933, as amended, or the Securities Act, and Section 21E of the Exchange Act, and the Private Securities
Litigation Reform Act of 1995. These statements are based on our management’s current beliefs, expectations and assumptions about
future events, conditions and results and on information currently available to us. All statements other than statements of historical
facts contained in this prospectus supplement and the accompanying prospectus, including statements regarding our strategy, future operations,
future financial position, future revenue, projected costs, prospects, plan, objectives of management, results of preclinical studies
or clinical trials and expected market growth are forward-looking statements. In some cases, forward-looking statements can be identified
by terminology such as “plan,” “expect,” “anticipate,” “may,” “might,” “will,”
“should,” “project,” “believe,” “estimate,” “predict,” “potential,”
“intend,” or “continue” and other words or terms of similar meaning.
We have based these forward-looking statements
largely on our current expectations and projections about future events and financial trends that we believe may affect our financial
condition, results of operations, business strategy and financial needs. These forward-looking statements are subject to a number of known
and unknown risks, uncertainties and assumptions, including risks described in the section titled “Risk Factors” contained
in our most recent Annual Report on Form 10-K and incorporated by reference in this prospectus, as the same may be amended, supplemented
or superseded by the risks and uncertainties described under similar headings in the other documents that are filed after the date hereof
and incorporated by reference into this prospectus, regarding, among other things:
| · | our ability to continue to operate despite incurring substantial losses since our inception and our expectation
that we will continue to incur substantial and increasing losses for the foreseeable future; |
| · | our ability to continue as a going concern; |
| · | our ability to obtain the substantial additional financing necessary to achieve our goals; |
| · | whether we will generate revenues and achieve profitability in the future; |
| · | the ability of investors to evaluate the success of our business and to assess our future viability given
our limited operating history; |
| · | our expectations regarding our continuing to incur significant operating and non-operating expenses; |
| · | the impact of the COVID-19 pandemic; |
| · | the initiation of legal or administrative actions against us; |
| · | our ability to use net operating losses to offset future taxable income; |
| · | our ability to comply with the regulatory and environmental provisions and laws to which we are subject; |
| · | our ability to develop our product candidates, including GPS and GFH009; |
| · | our ability to obtain regulatory approval of our product candidates; |
| · | whether the results of our clinical trials will be sufficient to support domestic or global regulatory
approvals; |
| · | the initiation, timing, progress and results of our pre-clinical and clinical trials; |
| · | the success of our lead product candidate, GPS, and our ability to successfully complete clinical trials
and obtain regulatory approval for our other product candidates; |
| · | whether our product development program will uncover all possible adverse events that patients who take
our product candidates may experience; |
| · | whether we can maintain orphan drug exclusivity and Fast Track designation for certain of our product
candidates and whether we will receive orphan drug product designation and Fast Track designation for additional product candidates should
we seek such designations; |
| · | our ability to successfully identify, acquire, develop or commercialize new potential product candidates; |
| · | our ability to realize benefits from strategic alliances that we may form in the future; |
| · | whether we can continue to rely on third parties to conduct our preclinical studies and clinical trials; |
| · | whether we can continue to rely on third parties to manufacture our product candidates; |
| · | whether we can rely on third parties to develop or potentially commercialize some or all of our product
candidates; |
| · | developments or disputes concerning our intellectual property or other proprietary rights; |
| · | our expectations regarding the potential market size and the size of the patient populations for our product
candidates, if approved, for commercial use; |
| · | the impact of legislation developments regarding pricing regulations; |
| · | the implementation of our business model and strategic plans for our business and product candidates; |
| · | our ability to maintain and establish collaborations or obtain additional funding; |
| · | our ability to regain compliance with Nasdaq Listing rules; |
| · | the market price and value of our common stock; |
| · | our ability to compete in the markets we serve; and |
| · | other factors that may impact our financial results. |
All of our forward-looking statements are as of
the date of this prospectus supplement only. In each case, actual results may differ materially from such forward-looking information.
We can give no assurance that such expectations or forward-looking statements will prove to be correct. An occurrence of or any material
adverse change in one or more of the risk factors or risks and uncertainties referred to in this prospectus supplement or included in
our other public disclosures or our other periodic reports or other documents or filings filed with or furnished to the SEC, could materially
and adversely affect our business, prospects, financial condition and results of operations. Except as required by law, we do not undertake
or plan to update or revise any such forward-looking statements to reflect actual results, changes in plans, assumptions, estimates or
projections or other circumstances affecting such forward-looking statements occurring after the date of this prospectus supplement, even
if such results, changes or circumstances make it clear that any forward-looking information will not be realized. Any public statements
or disclosures by us following this prospectus supplement that modify or impact any of the forward-looking statements contained herein
will be deemed to modify or supersede such statements in this prospectus supplement.
USE OF PROCEEDS
We expect to receive net proceeds of
approximately $8.2 million from this offering, after deducting the placement agent’s fee and estimated offering expenses
payable by us and excluding the proceeds, if any, from the exercise of the warrants and pre-funded warrants issued in this offering.
If all the warrants are exercised for cash at an exercise price of $0.75 per share and all of the pre-funded warrants are exercised
for cash at an exercise price of $0.0001 per share, then our net proceeds will be approximately $17.2 million, after deducting the
placement agent’s fee and estimated offering expenses payable by us. We cannot predict when or if the warrants or pre-funded
warrants will be exercised. It is possible that the warrants may expire and may never be exercised.
We expect to use the net proceeds of this offering,
in addition to our existing cash resources, for funding of ongoing operations, including clinical development of the product candidates
noted in this prospectus supplement, and for working capital and other general corporate purposes.
The amounts and timing of our actual expenditures
will depend on numerous factors, including the time and cost necessary to conduct our planned clinical trials, the results of our planned
clinical trials and other factors described in the section titled “Risk factors” in this prospectus supplement and the accompanying
prospectus, as well as the amount of cash used in our operations and any unforeseen cash needs. Therefore, our actual expenditures may
differ materially from the estimates described above. We may find it necessary or advisable to use the net proceeds for other purposes,
and we will have broad discretion in the application of the net proceeds from this offering.
DIVIDEND POLICY
We have never declared or paid cash dividends
on our capital stock. We intend to retain all of our future earnings, if any, to finance the growth and development of our business. We
do not intend to pay cash dividends to our stockholders in the foreseeable future. As a result, investors seeking cash dividends should
not purchase our common stock.
DILUTION
As of September 30, 2023, we had a historical
net tangible book deficit of $5.7 million, or $0.20 per share of common stock, based on 28,393,958 shares of common stock outstanding.
Our historical net tangible book deficit per share represents total tangible assets less total liabilities, divided by the number of shares
of common stock outstanding.
Our pro forma net tangible book deficit as of
September 30, 2023 was $2.3 million, or $0.07 per share of common stock. Pro forma net tangible book deficit per share represents
total tangible assets less total liabilities, divided by the number of shares of common stock outstanding as of September 30, 2023,
after giving effect to the issuance of 3,100,000 shares of common stock and the exercise of 552,300 pre-funded warrants, together with
the issuance of accompanying warrants to purchase an aggregate of 3,652,300 shares of common stock, which were issued in a registered
direct offering completed by us after September 30, 2023.
After giving effect to the sale by us of (i)
10,130,000 shares of common stock and accompanying warrants in this offering at
the public offering price of $0.75 per share and accompanying warrant and (ii) 1,870,000 pre-funded warrants and accompanying warrants in this offering at the public
offering price of $0.7499 per pre-funded warrant and accompanying warrant, and
after deducting fees, commissions and estimated offering expenses payable by us and excluding the proceeds and shares issuable, if
any, from the exercise of the pre-funded warrants and warrants issued pursuant to this offering, our as adjusted net tangible book
value as of September 30, 2023 would have been $5.9 million, or $0.14
per share. This amount represents an immediate increase in our net tangible
book deficit of $0.21 per share to our existing stockholders and an
immediate dilution in our net tangible book deficit of $0.61 per share to
investors participating in this offering. We determine dilution by subtracting our as adjusted net tangible book deficit per share
after this offering from the amount of cash paid by an investor for a share of common stock in this offering. The following table
illustrates this dilution on a per share basis:
Public offering price per share and accompanying warrant |
|
|
|
|
|
$ |
0.75 |
|
Historical net tangible book value (deficit) per share as of September 30, 2023 |
|
$ |
(0.20 |
) |
|
|
|
|
Increase in net tangible book value (deficit) per share attributable to pro forma adjustments |
|
$ |
0.13 |
|
|
|
|
|
Pro forma net tangible book value (deficit) per share as of September 30, 2023 |
|
|
|
|
|
$ |
(0.07 |
) |
Increase in net tangible book value (deficit) per share attributable to new investors in this offering |
|
$ |
0.21 |
|
|
|
|
|
As adjusted net tangible book value (deficit) per share after this offering |
|
|
|
|
|
$ |
0.14 |
|
Dilution in net tangible book value (deficit) per share to new investors in this offering |
|
|
|
|
|
$ |
0.61 |
|
The discussion and table above assume no sale of any pre-funded warrants
and no exercise of any warrants sold in this offering.
The number of shares of our common stock to be
outstanding after this offering set forth above is based on 28,393,958 shares of our common stock outstanding as of September 30,
2023 and excludes:
| o | 1,643,070 shares of our common stock issuable upon the exercise of stock options outstanding as of September 30, 2023, at a weighted-average
exercise price of $5.87 per share; |
| o | 432,986 shares of common stock issuable upon the vesting and settlement of RSUs outstanding as of September 30, 2023; |
| o | 12,221,059 shares of our common stock issuable upon the exercise of
warrants outstanding as of September 30, 2023, at a weighted-average exercise price of $3.31 per share, and 3,652,300 shares of our
common stock issuable upon the exercise of warrants issued after September 30, 2023, at an exercise price of $0.9702 per share; |
| o | 3,904,661 shares of our common stock reserved for future issuance under the 2023 Plan as of September 30, 2023; |
| o | 183,457 shares of our common stock reserved for future issuance under the 2021 Employee Plan as of September 30, 2023; and |
| o | 16,000 shares of our common stock issued under the Sales Agreement with Cantor Fitzgerald & Co. after September 30,
2023, up to the date of this Prospectus Supplement. |
MATERIAL U.S. FEDERAL INCOME TAX CONSIDERATIONS
The following discussion is a summary of the material
U.S. federal income tax considerations of the acquisition, ownership and disposition of shares of our common stock, pre-funded warrants
and warrants acquired in this offering by non-U.S. holders (as defined below) and the acquisition, ownership and disposition of pre-funded
warrants and warrants acquired in this offering by U.S. holders (as defined below) that, in each case, hold such shares, pre-funded warrants
or warrants as a capital asset within the meaning of Section 1221 of the Code (generally, property held for investment).
This section is based on current provisions of
the U.S. Internal Revenue Code of 1986, as amended, or the Code, U.S. Treasury Regulations promulgated thereunder, administrative rulings
and judicial decisions, all as in effect as of the date of this prospectus supplement and all of which are subject to change or to differing
interpretation, possibly with retroactive effect. Any such change or differing interpretation could alter the tax consequences to holders
described in this prospectus supplement. There can be no assurance that the U.S. Internal Revenue Service, or the IRS, will not challenge
one or more of the tax consequences described herein.
This discussion does not address all aspects of
U.S. federal income taxation that may be relevant to a particular holder in light of that holder’s individual circumstances nor
does it address U.S. state, local or non-U.S. taxes, U.S. federal estate or gift tax laws, any alternative minimum tax levied under the
Code, the Medicare tax on net investment income or any other aspect of any U.S. federal tax other than the income tax. This discussion
also does not consider any specific facts or circumstances that may apply to a holder and does not address the special tax rules applicable
to certain holders, such as:
| · | regulated investment companies and real estate investment trusts; |
| · | tax-exempt or governmental organizations; |
| · | brokers or dealers in securities; |
| · | traders that have elected to mark securities to market; |
| · | regulated investment companies; |
| · | corporations that accumulate earnings to avoid U.S. federal income tax; |
| · | “qualified foreign pension funds” as defined in Section 897(l)(2) of the Code and
entities all of the interests of which are held by qualified foreign pension funds; |
| · | persons deemed to sell our common stock or warrants under the constructive sale provisions of the Code; |
| · | persons that hold our common stock or warrants as part of a straddle, hedge, conversion transaction, synthetic
security or other integrated investment; |
| · | persons who hold or receive our common stock or warrants pursuant to the exercise of an employee stock
option or otherwise as compensation; |
| · | U.S. holders whose functional currency is not the U.S. dollar; and |
| · | certain U.S. expatriates. |
This discussion does not address the tax treatment
of partnerships (including any entity or arrangements treated as a partnership for U.S. federal income tax purposes) or persons that hold
their common stock, pre-funded warrants or warrants through such a partnerships. If an entity or arrangement treated as a partnership
for U.S. federal income tax purposes holds our common stock, pre-funded warrants or warrants, the tax treatment of a partner in the partnership
will depend on the status of the partner, the activities of the partnership and certain determinations made at the partner level. A partner
in a partnership or other pass-through entity (including an entity or arrangement that is treated as partnerships for U.S. federal income
tax purposes) that will hold our common stock, pre-funded warrants or warrants should consult his, her or its tax advisor regarding the
tax consequences of acquiring, holding and disposing of our common stock, pre-funded warrants or warrants through a partnership or other
pass-through entity, as applicable.
This discussion is for general information only
and is not intended to be, and may not be construed as, tax advice. Accordingly, all prospective holders of our common stock, pre-funded
warrants or warrants should consult their tax advisors with respect to the U.S. federal, state, local and non-U.S. tax consequences of
the purchase, ownership and disposition of our common stock, pre-funded warrants or warrants.
Treatment of Pre-Funded
Warrants
Although it is not entirely
free from doubt, a pre-funded warrant should be treated as a share of our common stock for U.S. federal income tax purposes and a holder
of pre-funded warrants should generally be taxed in the same manner as a holder of common stock, as described below. Accordingly, no gain
or loss should be recognized upon the exercise of a pre-funded warrant and, upon exercise, the holding period of a pre-funded warrant
should carry over to the share of common stock received. Similarly, the tax basis of the pre-funded warrant should carry over to the share
of common stock received upon exercise, increased by the exercise price of $0.0001. Each holder should consult his, her or its own tax
advisor regarding the risks associated with the acquisition of pre-funded warrants pursuant to this offering (including potential alternative
characterizations). The balance of this discussion generally assumes that the characterization described above is respected for U.S. federal
income tax purposes.
Material U.S. Federal Income Tax Considerations of Owning and Disposing
of Common Stock, Pre-Funded Warrants or Warrants for U.S. Holders
The following discusses the material U.S. federal
income tax consideration of owning and disposing of our common stock, pre-funded warrants or warrants for a U.S. holder. This section
does not address the U.S. federal income tax considerations for U.S. holders of backup withholding and information reporting.
For purposes of this discussion, a U.S. holder
is any beneficial owner of our common stock, pre-funded warrants or warrants that, for U.S. federal income tax purposes, is:
| · | an individual who is a citizen or resident of the United States; |
| · | an estate, the income of which is subject to U.S. federal income tax regardless of its source; or |
| · | a trust, if (A) a U.S. court is able to exercise primary supervision over the trust’s administration
and one or more U.S. persons have authority to control all of the trust’s substantial decisions or (B) the trust has validly
elected to be treated as a U.S. person for U.S. federal income tax purposes. |
Allocation of Purchase Price Between Shares or Pre-Funded Warrants
and Warrants
Because our common stock and accompanying warrants,
or pre-funded warrants and accompanying warrants as applicable, are sold together, a purchaser of shares of our common stock and accompanying
warrants, or pre-funded warrants and accompanying warrants as applicable, must allocate its purchase price between each share or pre-funded
warrant, as applicable, and the accompanying warrant based on their respective relative fair market values at the time of issuance. This
allocation of the purchase price will establish the holder’s initial tax basis for U.S. federal income tax purposes for each share
or pre-funded warrant, as applicable, and warrant. A holder’s allocation of the purchase price among the shares or pre-funded warrants,
as applicable, and warrants is not binding on the IRS or the courts, and no assurance can be given that the IRS or the courts will agree
with a holder’s allocation. Each holder should consult its own tax advisor regarding the allocation of the purchase price among
the shares or pre-funded warrants, as applicable, and warrants.
Distributions on Our Common Stock, Pre-Funded
Warrants and Warrants
As described in the section
titled “Dividend Policy,” we do not anticipate paying any future distributions on our shares. However, if we do make cash
or other property distributions on our common stock or pre-funded warrants, such distributions will constitute dividends for U.S. federal
income tax purposes to the extent paid out of our current or accumulated earnings and profits, as determined for U.S. federal income tax
purposes. Amounts not treated as dividends for U.S. federal income tax purposes will constitute a return of capital to the extent of the
holder’s tax basis in our common stock or pre-funded warrants, and, thereafter, as gain on the sale or other disposition of our
common stock or pre-funded warrants, which is taxed as described under “—Gains on Sale or Other Taxable Disposition of
Our Common Stock or Pre-Funded Warrants” below.
Dividends received by
a corporate U.S. holder may be eligible for a dividends received deduction, subject to applicable limitations. Dividends received by certain
non-corporate U.S. holders, including individuals, are generally taxed at the lower applicable capital gains rate provided certain holding
period and other requirements are satisfied.
Gains on Sale or Other
Taxable Disposition of Our Common Stock or Pre-Funded Warrants
Upon the sale or other
taxable disposition of our common stock or pre-funded warrants, a U.S. holder generally will recognize capital gain or loss equal to the
difference between (i) the amount of cash and the fair market value of any property received upon the sale or other taxable disposition
and (ii) such U.S. holder’s adjusted tax basis in the common stock or pre-funded warrants. Such capital gain or loss will be
long-term capital gain or loss if the U.S. holder’s holding period in such common stock or pre-funded warrants is more than one
year at the time of the sale or other taxable disposition. Long-term capital gains recognized by certain non-corporate U.S. holders, including
individuals, generally will be subject to reduced rates of U.S. federal income tax. The deductibility of capital losses is subject to
certain limitations.
Sale or Other Taxable Disposition of Warrants
Upon the sale or other
taxable disposition of a common warrant (other than by exercise), a U.S. holder will generally recognize capital gain or loss equal to
the difference between the amount realized on the sale or other taxable disposition and the U.S. holder’s tax basis in the common
warrant. This capital gain or loss will be long-term capital gain or loss if the U.S. holder’s holding period in such common warrant
is more than one year at the time of the sale or other disposition. The deductibility of capital losses is subject to certain limitations.
Exercise of Warrants
A U.S. holder generally will not recognize gain
or loss for U.S. federal income tax purposes on the exercise of a common warrant and the related receipt of common stock. A
U.S. holder’s tax basis in the common stock received upon exercise of the common warrant generally will equal the sum of the U.S.
holder’s tax basis in the warrant and the exercise price. It is unclear whether the U.S. holder’s holding period for the common
stock received upon exercise of the warrants will begin on the date following the date of exercise or on the date of exercise of the warrants;
in either case, the holding period will not include the period during which the U.S. holder held the warrants.
In certain circumstances,
the warrants may be exercised on a cashless basis. The U.S. federal income tax treatment of an exercise of a warrant on a cashless basis
is not clear under current law, and could differ from the consequences described above. It is possible that a cashless exercise is a non-taxable
transaction, either because the exercise is not treated as a realization event or because the exercise is treated as a tax-free recapitalization
for U.S. federal income tax purposes. Under either characterization, a U.S. holder’s tax basis in the common stock received generally
would equal the U.S. holder’s tax basis in the warrants. If the cashless exercise was not a realization event, it is unclear whether
a U.S. holder’s holding period for the shares of common stock acquired pursuant to the cashless exercise will commence on the date
of exercise of the warrant or the day following the date of exercise of the warrant. If the cashless exercise were treated as a recapitalization,
the holding period of the shares of common stock acquired pursuant to it would include the holding period of the warrants.
It is also possible that
a cashless exercise is treated as a taxable exchange in which gain or loss would be recognized. In such event, a U.S. holder may be deemed
to have surrendered warrants with an aggregate fair market value equal to the exercise price for the total number of warrants to be exercised.
The U.S. holder would recognize capital gain or loss in an amount equal to the difference between the fair market value of the warrants
deemed surrendered and the U.S. holder’s tax basis in such warrants (such gain or loss would be long-term or short-term, depending
on the U.S. holder’s holding period in the warrants deemed surrendered). In this case, a U.S. holder’s tax basis in the shares
of common stock received pursuant to the cashless exercise would equal the sum of the U.S. holder’s tax basis in the warrants exercised
and the exercise price of such warrants. It is unclear whether a U.S. holder’s holding period for the common stock would commence
on the date of exercise of the warrant or the day following the date of exercise of the warrant.
Due
to the absence of authority on the U.S. federal income tax treatment of a cashless exercise, there can be no assurance which, if any,
of the alternative tax consequences and holding periods described above would be adopted by the IRS or a court of law. Holders
are urged to consult their tax advisors as to the consequences of an exercise of a common warrant on a cashless basis, including with
respect to their holding period and tax basis in the common stock received.
Lapse of Warrants
If U.S. holder allows a common warrant to expire
unexercised, such holder will generally recognize a capital loss for U.S. federal income tax purposes in an amount equal to such holder’s
tax basis in the common warrant. Any such loss generally will be a capital loss and will be long-term capital loss if the common warrant
is held for more than one year. The deductibility of capital losses is subject to limitations.
Contingent Payments on the Warrants
The warrants entitle a holder to receive payments
upon the occurrence of certain contingencies, including a distribution on shares of our common stock or our failure to deliver shares
of common stock upon exercise of a common warrant. The tax treatment of such payments, if made, is subject to substantial uncertainty.
Holders should consult their own tax advisors as to the appropriate U.S. federal income tax treatment of any such contingent payments
that may be made to them in respect of the warrants.
Adjustments to Warrant Conversion Ratio
Under Section 305 of the Code, an adjustment
to the number of shares of our common stock that will be issued on exercise of the warrants, or an adjustment to the exercise price of
the warrants, may be treated as a constructive distribution to a holder of the warrants if, and to the extent that, such adjustment has
the effect for U.S. federal income tax purposes of increasing such U.S. holder’s proportionate interest in our earnings and profits
or assets, depending on the circumstances of such adjustment. Adjustments made pursuant to a bona fide reasonable adjustment formula which
has the effect of preventing the dilution of the interest of the holders of warrants generally will not be deemed to result in a constructive
distribution. A constructive distribution under these rules would be subject to tax in the same manner as if the U.S. holders of
the warrants received a cash distribution from us equal to the fair market value of such increased interest resulting from the adjustment.
Material U.S. Federal Income Tax Consequences for Non-U.S. Holders
The following discusses the material U.S. federal
income tax consequences of acquiring, owning and disposing of shares of our common stock, pre-funded warrants and warrants to a non-U.S.
holder. For purposes of this discussion, a U.S. holder is any beneficial owner of shares of our common stock, pre-funded warrants or warrants
that, for U.S. federal income tax purposes, is:
| · | a non-resident alien individual; |
| · | a foreign corporation or any other foreign association taxable as a corporation for U.S. federal income
tax purposes; or |
| · | a foreign estate or trust the income of which is not subject to U.S. federal income tax on a net income
basis. |
Allocation of Purchase Price Between Shares or Pre-Funded Warrants
and Warrants
If it is relevant for a non-U.S. holder to determine
its tax basis in shares of common stock, pre-funded warrants or warrants for U.S. federal income tax purposes, a U.S. holder will determined
such tax basis based on the allocation of the purchase price as described above under “Material U.S. Federal Income Tax Considerations
of Owning and Disposing of Pre-Funded Warrants or Warrants for U.S. Holders -- Allocation of Purchase Price Between Shares or Pre-Funded
Warrants and Warrants”.
Warrants
The
U.S. federal income tax treatment of a non-U.S. holder’s exercise of a warrant, or the lapse of a warrant held by a non-U.S. holder,
generally will correspond to the U.S. federal income tax treatment of the exercise or lapse of a warrant by a U.S. holder, as described
under “Material U.S. Federal Income Tax Considerations of Owning and Disposing of Pre-Funded Warrants or Warrants for
U.S. Holders” above, although to the extent a cashless exercise results in a taxable exchange,
the rules described below under “Material U.S. Federal Income Tax Consequences for Non-U.S. Holders—Gains on
Sale or Other Taxable Disposition of Our Common Stock, Pre-Funded Warrants or Warrants” would apply.
If contingent payments are made with respect to
a common warrant, as described above under “Material U.S. Federal Income Tax Considerations of Owning and Disposing of Pre-Funded
Warrants or Warrants for U.S. Holders—Contingent Payments on the Warrants”, such
payments may be subject to a U.S. withholding tax. Any U.S. federal income tax required to be withheld on any portion of such contingent
payment may be withheld from common stock delivered, sales proceeds subsequently paid or credited, or other amounts payable or distributable
to a non-U.S. holder.
Distributions on Our Common Stock, Pre-Funded Warrants and Warrants
As described in the section titled “Dividend
Policy,” we do not anticipate paying any future distributions on our shares. However, if we do make distributions on our shares
or pre-funded warrants, such distributions will constitute dividends to the extent paid from our current or accumulated earnings and profits,
as determined under U.S. federal income tax principles. If a distribution exceeds our current and accumulated earnings and profits, the
excess will be treated as a tax-free return of the non-U.S. holder’s investment, up to such holder’s adjusted tax basis in
the shares. Any remaining excess will be treated as capital gain from the sale or exchange of such shares, subject to the tax treatment
described below in “—Gain on Sale or Other Taxable Disposition of Our Common Stock or Pre-Funded Warrants.” Any
such distributions will also be subject to the discussions below in the sections titled “—Backup Withholding and Information
Reporting” and “FATCA.”
Subject to the discussion in the remainder of
this section, dividends (including any portion of constructive distributions treated as dividends) paid to a non-U.S. holder generally
will be subject to withholding of U.S. federal income tax at a 30% rate or such lower rate as may be specified by an applicable income
tax treaty between the United States and such holder’s country of residence. Dividends that are treated as effectively connected
with a trade or business conducted by a non-U.S. holder within the United States and, if an applicable income tax treaty so provides,
that are attributable to a permanent establishment or a fixed base maintained by the non-U.S. holder within the United States, are generally
exempt from the 30% withholding tax if that non-U.S. holder has furnished to us or our paying agent an Internal Revenue Service Form W-8ECI
(or applicable successor form), certifying under penalties of perjury that the dividend is effectively connected with the non-U.S. holder’s
conduct of a trade or business in the United States (and, if an applicable income tax treaty so provides, attributable to a permanent
establishment or fixed base maintained in the United States). However, such U.S. effectively connected income, net of specified deductions
and credits, is generally taxed on a net income basis in the same manner and at the same regular U.S. federal income tax rates applicable
to United States persons (as defined in the Code). Any U.S. effectively connected income received by a corporate non-U.S. holder may also,
under certain circumstances, be subject to an additional “branch profits tax” at a 30% rate or such lower rate as may be specified
by an applicable income tax treaty between the United States and such holder’s country of residence.
A non-U.S. holder of our common stock who claims
the benefit of an applicable income tax treaty between the United States and such holder’s country of residence generally will be
required to provide a properly executed IRS Form W-8BEN or W-8BEN-E (or successor form) to the applicable withholding agent and satisfy
applicable certification and other requirements. A non-U.S. holder that holds our shares through a financial institution or other agent
will be required to provide appropriate documentation to the financial institution or other agent, which then will be required to provide
certification to us or our paying agent either directly or through other intermediaries. Non-U.S. holders are urged to consult their tax
advisors regarding their entitlement to benefits under a relevant income tax treaty. A non-U.S. holder that is eligible for a reduced
rate of U.S. withholding tax under an income tax treaty may obtain a refund or credit of any excess amounts withheld by timely filing
a U.S. tax return with the IRS.
The taxation of a distribution received with respect
to a pre-funded warrant is unclear. It is possible such a distribution would be treated as a distribution as described in this section,
although other treatments may also be possible. Non-U.S. Holders should consult their own tax advisors regarding the proper treatment
of any payments in respect of the pre-funded warrants.
Gains on Sale or Other Taxable Disposition of Our Common Stock,
Pre-Funded Warrants or Warrants
Subject to the discussions below under “—Backup
Withholding and Information Reporting” and “—FATCA,” a non-U.S. holder generally will not be subject
to any U.S. federal income or withholding tax on any gain realized upon such holder’s sale or other taxable disposition of shares
of our common stock, pre-funded warrants or warrants unless:
· |
the gain is effectively connected with the non-U.S. holder’s conduct of a U.S. trade or business and, if an applicable income tax treaty so provides, is attributable to a permanent establishment or a fixed base maintained by such non-U.S. holder in the United States, in which case the non-U.S. holder generally will be taxed on a net income basis at the regular U.S. federal income tax rates applicable to United States persons (as defined in the Code) and, if the non-U.S. holder is a foreign corporation, the branch profits tax described above in “Distributions on Our Common Stock” also may apply; |
· |
the non-U.S. holder is a nonresident alien individual who is present in the United States for 183 days or more in the taxable year of the disposition and certain other conditions are met, in which case the non-U.S. holder will be subject to a 30% tax (or such lower rate as may be specified by an applicable income tax treaty between the United States and such holder’s country of residence) on the net gain derived from the sale or other taxable disposition of the shares of common stock or warrants, as applicable, which may be offset by certain U.S. source capital losses of the non-U.S. holder, if any (even though the individual is not considered a resident of the United States), provided that the non-U.S. holder has timely filed U.S. federal income tax returns with respect to such losses; or |
· |
we are, or have been, at any time during the five-year period preceding such sale or other taxable disposition (or the non-U.S. holder’s holding period, if shorter) of such shares of common stock or warrants, as applicable, a U.S. real property holding corporation, unless our common stock is regularly traded on an established securities market and the non-U.S. holder holds no more than 5% (by value) of our outstanding common stock or warrants, as applicable, directly or indirectly, actually or constructively, during the shorter of the 5-year period ending on the date of the disposition or the period that the non-U.S. holder held our common stock or warrants. If we are or were a U.S. real property holding corporation during the relevant period and the foregoing exception does not apply, the non-U.S. holder generally will be taxed on its net gain derived from the disposition at the regular U.S. federal income tax rates applicable to United States persons (as defined in the Code). Generally, a corporation is a U.S. real property holding corporation only if the fair market value of its U.S. real property interests equals or exceeds 50% of the sum of the fair market value of its worldwide real property interests plus its other assets used or held for use in a trade or business. Although there can be no assurance, we do not believe that we are, or have been, a U.S. real property holding corporation, or that we are likely to become one in the future. No assurance can be provided that our common stock will be regularly traded on an established securities market for purposes of the rules described above. Special rules may apply to non-U.S. holders of pre-funded warrants, who should consult their tax advisors. |
Backup Withholding and Information Reporting
We must report annually to the IRS and to each
non-U.S. holder the gross amount of the distributions on our securities paid to such holder and the tax withheld, if any, with respect
to such distributions. A non-U.S. holder may have to comply with specific certification procedures to establish that such holder is not
a United States person (as defined in the Code) in order to avoid backup withholding at the applicable rate with respect to dividends
on our securities. Dividends paid to non-U.S. holders subject to withholding of U.S. federal income tax, as described above in “—Distributions
on Our Common Stock, Pre-Funded Warrants and Warrants,” generally will be exempt from U.S. backup withholding.
Information reporting and backup withholding will
generally apply to the proceeds of a disposition of our securities by a non-U.S. holder effected by or through the U.S. office of any
broker, U.S. or foreign, unless the holder certifies its status as a non-U.S. holder and satisfies certain other requirements, or otherwise
establishes an exemption. Generally, information reporting and backup withholding will not apply to a payment of disposition proceeds
to a non-U.S. holder where the transaction is effected outside the United States through a non-U.S. office of a broker. However, for information
reporting purposes, dispositions effected through a non-U.S. office of a broker with substantial U.S. ownership or operations generally
will be treated in a manner similar to dispositions effected through a U.S. office of a broker.
Backup withholding is not an additional tax. Any
amounts withheld under the backup withholding rules from a payment to a non-U.S. holder can be refunded or credited against the non-U.S.
holder’s U.S. federal income tax liability, if any, provided that an appropriate claim is filed with the IRS in a timely manner.
Non-U.S. holders should consult their tax advisors
regarding the application of the information reporting and backup withholding rules to them. Copies of information returns may be
made available to the tax authorities of the country in which the non-U.S. holder resides or is incorporated under the provisions of a
specific treaty or agreement.
FATCA
Provisions of the Code commonly referred to as
the Foreign Account Tax Compliance Act, or FATCA, generally impose a U.S. federal withholding tax at a rate of 30% on payments of dividends
on our common stock paid to a foreign entity unless (i) if the foreign entity is a “foreign financial institution,” such
foreign entity undertakes certain due diligence, reporting, withholding, and certification obligations, (ii) if the foreign entity
is not a “foreign financial institution,” such foreign entity either certifies it does not have any substantial U.S. owners
or furnishes identifying information regarding each substantial U.S. owner and such entity meets certain other specified requirements,
or (iii) the foreign entity is otherwise exempt under FATCA. Such withholding may also apply to gross proceeds from the sale or other
disposition of our common stock or warrants, although under proposed U.S. Treasury Regulations, no withholding would apply to such gross
proceeds. The preamble to the proposed regulations specifies that taxpayers (including withholding agents) are permitted to rely on the
proposed regulations pending finalization. Under certain circumstances, a non-U.S. holder may be eligible for refunds or credits of this
withholding tax. An intergovernmental agreement between the United States and an applicable foreign country may modify the requirements
described in this paragraph. Non-U.S. holders should consult their tax advisors regarding the possible implications of this legislation
on their investment in our common stock and the entities through which they hold our common stock, including, without limitation, the
process and deadlines for meeting the applicable requirements to prevent the imposition of the 30% withholding tax under FATCA.
The preceding discussion of U.S. federal income
tax considerations is for general information only. It is not tax advice. Each prospective investor should consult its tax advisor regarding
the particular U.S. federal, state and local and non-U.S. tax consequences of purchasing, holding and disposing of our common stock, pre-funded
warrants or warrants, including the consequences of any proposed change in applicable laws.
DESCRIPTION OF CAPITAL STOCK
We are offering 10,130,000 shares of our
common stock, pre-funded warrants to purchase 1,870,000 shares of our common stock and accompanying warrants to purchase 12,000,000
shares of our common stock. Each share of common stock we sell
will be accompanied by a warrant to purchase one share of common stock. The shares of common stock and warrants will be issued
separately. We are also registering the shares of common stock issuable from time to time upon exercise of the common warrants
offered hereby.
We are also offering pre-funded warrants in lieu
of shares of common stock to the investors whose purchase of shares of common stock in this offering would otherwise result in such investor,
together with its affiliates, beneficially owning more than 4.99% (or, at the election of the investor, 9.99%) of our common stock. Each
pre-funded warrant sold in this offering will be accompanied by a warrant to purchase one share of our common stock. The pre-funded warrants
and the accompanying warrants will be issued separately. We are also registering the shares of common stock issuable from time to time
upon exercise of the pre-funded warrants offered hereby.
As of the date of this prospectus supplement,
our amended and restated certificate of incorporation authorizes us to issue up to 350,000,000 shares of common stock, $0.0001 par value
per share, and 5,000,000 shares of preferred stock, $0.0001 par value per share.
The following is a summary of the rights of our
common, preferred stock, pre-funded warrants and warrants and some of the provisions of our amended and restated certificate of incorporation
and amended and restated bylaws and Delaware General Corporation Law. This is only a summary and is qualified in its entirety by reference
to our amended and restated certificate of incorporation and our amended and restated bylaws, which are incorporated by reference into
the registration statement of which this prospectus supplement is a part.
Common stock
Voting
Each holder of our common stock is entitled to
one vote for each share on all matters submitted to a vote of the stockholders, including the election of directors. Our amended and restated
certificate of incorporation and amended and restated bylaws do not provide for cumulative voting rights. Because of this absence of cumulative
voting, the holders of a majority of the shares of common stock entitled to vote in any election of directors can elect all the directors
standing for election, if they should so choose.
Dividends
Subject to preferences that may be applicable
to any then outstanding shares of preferred stock, holders of common stock are entitled to receive ratably those dividends, if any, as
may be declared from time to time by our board of directors out of legally available funds.
Liquidation
In the event of our dissolution or liquidation,
holders of common stock will be entitled to share ratably in the net assets legally available for distribution to stockholders after the
payment of all our debts and other liabilities and the satisfaction of any preferential rights that may be granted to the holders of any
then outstanding shares of preferred stock.
Rights and Preferences
Holders of common stock have no preemptive, conversion
or subscription rights, and there are no redemption or sinking fund provisions applicable to the common stock. The rights, preferences,
and privileges of the holders of common stock are subject to, and may be adversely affected by, the rights of the holders of shares of
any series of preferred stock.
Fully-paid
All of the outstanding shares of our common stock
are, and the shares of common stock issued upon the conversion of any securities convertible into our common stock will be, fully paid
and non-assessable. The shares of common stock offered by this prospectus or upon the conversion of any preferred stock or debt securities
or exercise of any warrants offered pursuant to this prospectus, when issued and paid for, will also be, fully paid and non-assessable.
Pre-Funded Warrants
The following summary of certain terms and provisions
of the pre-funded warrants that are being offered hereby is not complete and is subject to, and qualified in its entirety by, the provisions
of the pre-funded warrant, the form of which will be filed as an exhibit to our Current Report on Form 8-K. Prospective investors
should carefully review the terms and provisions of the form of pre-funded warrant for a complete description of the terms and conditions
of the pre-funded warrants.
Each pre-funded warrant will be sold in this offering
at a purchase price equal to $0.7499 (equal to the purchase price per share of common stock, minus $0.0001). The purpose of the pre-funded warrants
is to enable investors that may have restrictions on their ability to beneficially own more than 4.99% (or, upon election of the holder,
9.99%) of our outstanding common stock following the consummation of this offering the opportunity to make an investment in the Company
without triggering their ownership restrictions, by receiving pre-funded warrants in lieu of our common stock which would result in such
ownership of more than 4.99% (or 9.99%), and receive the ability to exercise their option to purchase the shares underlying the pre-funded
warrants at such nominal price at a later date.
Exercise Price and Duration
The pre-funded warrants will have an exercise
price of $0.0001 per share. The pre-funded warrants are exercisable immediately upon issuance, and may be exercised at any time until
all of the pre-funded warrants are exercised in full. The exercise price is subject to appropriate adjustment in the event of certain
stock dividends and distributions, stock splits, stock combinations, reclassifications or similar events affecting our shares of common
stock and also upon any distributions of assets, including cash, stock or other property to our shareholders.
Exercisability
The pre-funded warrants will be exercisable, at
the option of each holder, in whole or in part by delivering to us a duly executed exercise notice and, at any time a registration statement
registering the issuance of the shares of common stock underlying the pre-funded warrants under the Securities Act is effective and available
for the issuance of such shares, or an exemption from registration under the Securities Act is available for the issuance of such shares,
by payment in full in immediately available funds for the number of common shares purchased upon such exercise.
Cashless Exercise
If, at the time of exercise there is no effective
registration statement registering, or the prospectus contained therein is not available for the issuance of, the shares of common stock
underlying the pre-funded warrants, then the pre-funded warrants may also be exercised, in whole or in part, at such time by means of
a cashless exercise, in which case the holder would receive upon such exercise the net number of common shares determined according to
the formula set forth in the pre-funded warrant.
Exercise Limitation
A holder will not have the right to exercise any
portion of the pre-funded warrant if the holder (together with its affiliates) would beneficially own in excess of 4.99% (or 9.99% upon
the request of the holder) of the number of common shares outstanding immediately after giving effect to the exercise, as such percentage
ownership is determined in accordance with the terms of the pre-funded warrants. However, any holder may increase or decrease such percentage,
provided that any increase will not be effective until the 61st day after such election.
Transferability
Subject to applicable laws, the pre-funded warrants
may be offered for sale, sold, transferred or assigned without our consent.
Fractional Shares
No fractional common shares will be issued upon
the exercise of the pre-funded warrants. Rather, the number of common shares to be issued will be rounded to the nearest whole number.
Trading Market
There is no established public trading market
for the warrants being issued in this offering, and we do not expect a market to develop. We do not intend to apply for listing of the
warrants on any securities exchange or other nationally recognized trading system. Without an active trading market, the liquidity of
the pre-funded warrants will be limited.
Fundamental Transactions
If a fundamental transaction occurs, then the
successor entity will succeed to, and be substituted for us, and may exercise every right and power that we may exercise and will assume
all of our obligations under the pre-funded warrants with the same effect as if such successor entity had been named in the pre-funded
warrant itself. If holders of our common shares are given a choice as to the securities, cash or property to be received in a fundamental
transaction, then the holder shall be given the same choice as to the consideration it receives upon any exercise of the pre-funded warrant
following such fundamental transaction.
Rights as a Shareholder
Except as otherwise provided in the pre-funded
warrants or by virtue of such holder’s ownership of our shares of common stock, the holder of a pre-funded warrant does not have
the rights or privileges of a holder of our common shares, including any voting rights, until the holder exercises the pre-funded warrant.
Amendment and Waiver
The pre-funded warrants may be modified or amended
or the provisions thereof waived with the written consent of our company and the respective holder.
Warrants
The following is a summary of the material terms
and provisions of the warrants that are being offered hereby. This summary is subject to and qualified in its entirety by the form of
warrant, which will be filed with the SEC as an exhibit to a Current Report on Form 8-K in connection with this offering and incorporated
by reference into the registration statement of which this prospectus supplement and the accompanying prospectus form a part. Prospective
investors should carefully review the terms and provisions of the form of warrant for a complete description of the terms and conditions
of the warrants.
Duration
and Exercise Price. The warrants offered hereby will have an exercise price of $0.75 per share and will expire on the
five-year anniversary of the initial exercise date. The exercise price and number of shares of common stock issuable upon exercise
of the warrants are subject to appropriate adjustment in the event of stock dividends, stock splits, reorganizations or similar
events affecting our common stock.
Exercisability.
The warrants will be exercisable, at the option of each holder, in whole or in part, by delivering a duly executed exercise notice accompanied
by payment in full for the number of shares of our common stock purchased upon such exercise (except in the case of a cashless exercise
as discussed below). A holder (together with its affiliates) may not exercise any portion of such holder’s common warrants to the
extent that the holder would own more than 9.99% of our outstanding common stock immediately after exercise.
Exercise
Limitations. We may not effect the exercise of any warrant, and a holder will not be entitled to exercise any portion of any
common warrant that, upon giving effect to such exercise, would cause the aggregate number of shares of common stock beneficially owned
by such holder (together with its affiliates) to exceed 4.99% or 9.99% (at the election of the holder) of the number of shares of common
stock outstanding immediately after giving effect to the exercise. However, any holder of a warrant may increase or decrease such percentage
upon at least 61 days’ prior written notice from the holder to us, provided that such percentage in no event exceeds 9.99%.
Cashless
Exercise. If, at the time a holder exercises its warrants a registration statement registering the issuance of the shares of
common stock underlying such warrants under the Securities Act is not then effective or available for the issuance of such shares, or
the prospectus contained therein is not available for the issuance of such shares, then in lieu of making the cash payment to us upon
such exercise in payment of the aggregate exercise price, the holder may elect instead to receive upon such exercise (either in whole
or in part) the net number of shares of common stock determined according to a formula set forth in the warrant.
Transferability.
Subject to applicable laws, the warrants may be offered for sale, sold, transferred or assigned without our consent.
Trading
Market. There is no established trading market for any of the warrants, and we do not expect a market to develop. We do not
intend to apply for a listing for any of the warrants on any securities exchange or other nationally recognized trading system. Without
an active trading market, the liquidity of the warrants will be limited.
Rights
as a Shareholder. Except as otherwise provided in the warrants or by virtue of the holders’ ownership of shares of our
common stock, the holders of warrants do not have the rights or privileges of the holders of our common stock, including any voting rights,
until such warrant holders exercise their warrants.
Fundamental
Transaction. If a fundamental transaction occurs, then the successor entity will succeed to, and be substituted for us, and
may exercise every right and power that we may exercise and will assume all of our obligations under the pre-funded warrants with the
same effect as if such successor entity had been named in the pre-funded warrant itself. If holders of our common shares are given a choice
as to the securities, cash or property to be received in a fundamental transaction, then the holder shall be given the same choice as
to the consideration it receives upon any exercise of the pre-funded warrant following such fundamental transaction. Additionally, as
more fully described in the form of warrant, in the event of certain fundamental transactions, the holders of the pre-funded warrants
will be entitled to receive consideration in an amount equal to the Black Scholes value of the warrants on the date of consummation of
the transaction.
Preferred stock
Under our amended and restated certificate of
incorporation, our board of directors has the authority, without further action by our stockholders, to issue up to 5,000,000 shares of
preferred stock in one or more series and to fix the rights, preferences, privileges and restrictions thereof. These rights, preferences
and privileges could include dividend rights, conversion rights, voting rights, terms of redemption, liquidation preferences, sinking
fund terms and the number of shares constituting any series or the designation of such series, any or all of which may be greater than
the rights of common stock. The issuance of our preferred stock could adversely affect the voting power of holders of common stock and
the likelihood that such holders will receive dividend payments and payments upon liquidation. In addition, the issuance of preferred
stock could have the effect of delaying, deferring or preventing a change of control of our company or other corporate action.
The following summary of terms of our preferred
stock is not complete. You should refer to the provisions of our amended and restated certificate of incorporation and amended and restated
bylaws and the resolutions containing the terms of each class or series of the preferred stock which have been or will be filed with the
SEC at or prior to the time of issuance of such class or series of preferred stock and described in the applicable prospectus supplement.
The applicable prospectus supplement may also state that any of the terms set forth herein are inapplicable to such series of preferred
stock, provided that the information set forth in such prospectus supplement does not constitute material changes to the information herein
such that it alters the nature of the offering or the securities offered.
Our board of directors will fix the designations,
voting powers, preferences and rights of the preferred stock of each series we issue under this prospectus, as well as the qualifications,
limitations or restrictions thereof, in the certificate of designation relating to that series. We will file as an exhibit to the registration
statement of which this prospectus is a part, or will incorporate by reference from reports that we file with the SEC, the form of any
certificate of designation that describes the terms of the series of preferred stock we are offering. We will describe in the applicable
prospectus supplement the terms of the series of preferred stock being offered, including, to the extent applicable:
| · | the title and stated value; |
| · | the number of shares we are offering; |
| · | the liquidation preference per share; |
| · | the dividend rate, period and payment date and method of calculation for dividends; |
| · | whether dividends will be cumulative or non-cumulative and, if cumulative, the date from which dividends will accumulate; |
| · | the procedures for any auction and remarketing; |
| · | the provisions for a sinking fund; |
| · | the provisions for redemption or repurchase and any restrictions on our ability to exercise those redemption and repurchase rights; |
| · | any listing of the preferred stock on any securities exchange or market; |
| · | whether the preferred stock will be convertible into our common stock or other securities, and the conversion rate or conversion price,
or how they will be calculated, and the conversion period; |
| · | whether the preferred stock will be exchangeable into debt securities, and the exchange rate or exchange price, or how they will be
calculated, and the exchange period; |
| · | voting rights of the preferred stock; |
| · | restrictions on transfer, sale or other assignment; |
| · | whether interests in the preferred stock will be represented by depositary shares; |
| · | a discussion of material or special U.S. federal income tax considerations applicable to the preferred stock; |
| · | the relative ranking and preferences of the preferred stock as to dividend rights and rights if we liquidate, dissolve or wind up
our affairs; |
| · | any limitations on the issuance of any class or series of preferred stock ranking senior to or on parity with the series of preferred
stock as to dividend |
| · | rights and rights if we liquidate, dissolve or wind up our affairs; and |
| · | any other specific terms, preferences, rights or limitations of, or restrictions on, the preferred stock. |
If we issue shares of preferred stock under this
prospectus, they will be validly issued, fully paid and non-assessable.
The DGCL provides that the holders of preferred
stock will have the right to vote separately as a class on any proposal involving fundamental changes in the rights of holders of such
preferred stock. This right is in addition to any voting rights that may be provided for in the applicable certificate of designation.
The issuance of our preferred stock could adversely
affect the voting power, conversion or other rights of holders of common stock and reduce the likelihood that such holders will receive
dividend payments and payments upon liquidation. In addition, the issuance of preferred stock could have the effect of delaying, deferring
or preventing a change in control of our company or other corporate action. Additionally, the issuance of preferred stock may have the
effect of decreasing the market price of our common stock.
Possible Anti-Takeover Effects of Delaware
Law and Our Certificate of Incorporation and Bylaws
Provisions of the DGCL and our amended and restated
certificate of incorporation and amended and restated bylaws could make it more difficult to acquire our company by means of a tender
offer, a proxy contest or otherwise, or to remove incumbent officers and directors. These provisions, summarized below, are expected to
discourage certain types of coercive takeover practices and takeover bids that our board of directors may consider inadequate and to encourage
persons seeking to acquire control of our company to first negotiate with our board of directors. We believe that the benefits of increased
protection of our ability to negotiate with the proponent of an unfriendly or unsolicited proposal to acquire or restructure our company
outweigh the disadvantages of discouraging takeover or acquisition proposals because, among other things, negotiation of these proposals
could result in an improvement of their terms.
Classified Board
Our amended and restated certificate of incorporation
and our amended and restated bylaws provide that our board of directors is divided into three classes. The directors designated as Class II
directors have terms expiring at the annual meeting of stockholders in 2024. The directors designated as Class I directors will have
terms expiring at the annual meeting of stockholders in 2025, and the directors designated as Class I directors will have terms expiring
at the annual meeting of stockholders in 2026. Directors for each class will be elected at the annual meeting of stockholders held in
the year in which the term for that class expires and thereafter will serve for a term of three years. At any meeting of stockholders
for the election of directors at which a quorum is present, the election will be determined by a plurality of the votes cast by the stockholders
entitled to vote at the election. Under the classified board provisions, it would take at least two elections of directors for any individual
or group to gain control of our board. Accordingly, these provisions could discourage a third party from initiating a proxy contest, making
a tender offer or otherwise attempting to gain control of our company.
Removal of Directors
Our amended and restated bylaws provide that our
stockholders may only remove our directors with cause.
Amendment
Our amended and restated certificate of incorporation
and our amended and restated bylaws provide that the affirmative vote of the holders of at least 75% of our voting stock then outstanding
is required to amend certain provisions relating to the number, term, election and removal of our directors, the filling of our board
vacancies, stockholder notice procedures, the calling of special meetings of stockholders and the indemnification of directors. Further,
any amendments of our bylaws must be approved by our stockholders as our amended and restated certificate of incorporation does not authorize
our board of directors to amend our bylaws.
Size of Board and Vacancies
Our amended and restated bylaws provide that the
number of directors on our board of directors is fixed exclusively by our board of directors. Newly created directorships resulting from
any increase in our authorized number of directors will be filled by a majority of our board of directors then in office, provided that
a majority of the entire board of directors, or a quorum, is present and any vacancies in our board of directors resulting from death,
resignation, retirement, disqualification, removal from office or other cause will be filled generally by the majority vote of our remaining
directors in office, even if less than a quorum is present.
Special Stockholder Meetings
Our amended and restated certificate of incorporation
provides that only the Chairman of our board of directors, our Chief Executive Officer or our board of directors pursuant to a resolution
adopted by a majority of the total number of directors we would have if there were no vacancies may call special meetings of our stockholders.
Stockholder Action by Unanimous Written Consent
Our amended and restated certificate of incorporation
expressly eliminates the right of our stockholders to act by written consent.
Requirements for Advance Notification of Stockholder
Nominations and Proposals
Our amended and restated bylaws provide advance
notice procedures with respect to stockholder proposals and nomination of candidates for election as directors other than nominations
made by or at the direction of board of directors or a committee of our board of directors.
No Cumulative Voting
The DGCL provides that stockholders are denied
the right to cumulate votes in the election of directors unless our certificate of incorporation provides otherwise. Our amended and restated
certificate of incorporation does not provide for cumulative voting.
Undesignated Preferred Stock
The authority that is possessed by our board of
directors to issue preferred stock could potentially be used to discourage attempts by third parties to obtain control of our company
through a merger, tender offer, proxy contest, or otherwise by making it more difficult or costlier to obtain control of our company.
Our board of directors may issue preferred stock with voting rights or conversion rights that, if exercised, could adversely affect the
voting power of the holders of common stock.
Authorized but Unissued Shares
Our authorized but unissued shares of common stock
and preferred stock will be available for future issuance without stockholder approval. We may use additional shares for a variety of
purposes, including future public offerings to raise additional capital, to fund acquisitions and as employee compensation. The existence
of authorized but unissued shares of common stock and preferred stock could render more difficult or discourage an attempt to obtain control
of our company by means of a proxy contest, tender offer, merger or otherwise.
The above provisions may deter a hostile takeover
or delay a change in control or management of our company.
Listing on the Nasdaq Capital Market
Our common stock is listed on the Nasdaq
Capital Market under the symbol “SLS”. On January 4, 2024, the closing price of our common stock was $0.5816 per
share. As of January 4, 2024, we had approximately 37 stockholders of
record.
Transfer Agent and Registrar
The transfer agent and registrar for our capital
stock is Computershare Trust Company, N.A. Its address is 250 Royall Street, Canton, MA 02021. Its telephone number is (201) 680-4503.
PLAN OF DISTRIBUTION
A.G.P./Alliance Global Partners, or the
Placement Agent, has agreed to act as our exclusive placement agent in connection with this offering subject to the terms and
conditions of the placement agent agreement dated January 4, 2024. The
Placement Agent is not purchasing or selling any of the securities offered by this prospectus supplement, nor is it required to
arrange the purchase or sale of any specific number or dollar amount of securities, but has agreed to use its reasonable best
efforts to arrange for the sale of all of the securities offered hereby. We have entered into a securities purchase agreement directly
with the investors, at the investor’s option, who purchased our securities in this offering. Investors who did not enter into a
securities purchase agreement shall rely solely on this prospectus in connection with the purchase of our securities in this
offering.
We will deliver the securities being issued
to the investor upon receipt of such investor’s funds for the purchase of the securities offered pursuant to this prospectus
supplement. We expect to deliver the securities being offered pursuant to this prospectus supplement on or about January 8, 2024.
We have agreed to indemnify the Placement Agent
against specified liabilities, including liabilities under the Securities Act, and to contribute to payments the Placement Agent may be
required to make in respect thereof.
Fees and Expenses
We have engaged A.G.P. as our placement agent
in connection with this offering. This offering is being conducted on a “reasonable best efforts” basis and the Placement
Agent has no obligation to buy any of the securities from us or to arrange for the purchase or sale of any specific number or dollar amount
of securities. We have agreed to pay the Placement Agent a fee based on the aggregate proceeds as set forth in the table below.
| |
Per Share and Accompanying Warrant | | |
Per Pre-Funded
Warrant and Accompanying Warrant | | |
Total | |
Public Offering Price | |
$ | 0.7500 | | |
$ | 0.7499 | | |
$ | 8,999,813.00 | |
Placement Agent Fees(1) | |
$ | 0.0525 | | |
$ | 0.0525 | | |
$ | 629,986.91 | |
Proceeds, before expenses, to us(2) | |
$ | 0.6975 | | |
$ | 0.6974 | | |
$ | 8,369,826.09 | |
(1) |
We have agreed to pay the Placement Agent a cash placement commission equal to 7.0% of the aggregate proceeds from the sale of the securities sold in this offering. We have also agreed to reimburse the Placement Agent for certain expenses incurred in connection with this offering. |
(2) |
The amount of the offering proceeds to us presented in this table does not give effect to any exercise of the pre-funded warrants or warrants being issued in this offering. |
We estimate that the total expenses of the offering
payable by us, excluding the placement agent’s fees, will be approximately $0.2 million, which includes up to $60,000 of legal fees and expenses
that we have agreed to reimburse A.G.P./Alliance Global Partners in connection with this offering.
The placement agent may be deemed to be underwriters
within the meaning of Section 2(a)(11) of the Securities Act, and any commissions received by them and any profit realized on the
resale of the securities sold by them while acting as principal might be deemed to be underwriting discounts or commissions under the
Securities Act. As underwriters, the placement agent would be required to comply with the requirements of the Securities Act and the Exchange
Act, including, without limitation, Rule 415(a)(4) under the Securities Act and Rule 10b-5 and Regulation M under the Exchange
Act. These rules and regulations may limit the timing of purchases and sales of securities by the placement agent acting as principal.
Under these rules and regulations, the placement agent:
| · | may not engage in any stabilization activity in connection with our securities; and |
| · | may not bid for or purchase any of our securities or attempt to induce any person to purchase any of our
securities, other than as permitted under the Exchange Act, until it has completed its participation in the distribution. |
Discretionary Accounts
The placement agent does not intend to confirm
sales of the securities offered hereby to any accounts over which it has discretionary authority.
Listing
Our common stock is listed on The Nasdaq
Capital Market under the symbol “SLS.” We do not intend to list the warrants or pre-funded warrants on any national
securities exchange or any other nationally recognized trading system.
Lock-Up Agreements
Our directors and officers have entered into lock-up
agreements. Under these agreements, these individuals have agreed, subject to specified exceptions, not to sell or transfer any shares
of common stock or securities convertible into, or exchangeable or exercisable for, our common stock during a period ending 60 days after
the date of this prospectus supplement, without first obtaining the written consent of the purchaser party to the securities purchase
agreement. Specifically, these individuals have agreed, in part, not to:
· |
sell, offer, contract or grant any option to sell (including any short sale), pledge, transfer, establish an open “put equivalent position” within the meaning of Rule 16a-l(h) under the Securities Exchange Act of 1934, as amended; |
· |
enter into any swap or other agreement, arrangement, hedge or transaction that transfers to another, in whole or in part, directly or indirectly, any of the economic consequences of ownership of our securities, whether any such transaction is to be settled by delivery of shares of our common stock, in cash or otherwise; |
· |
publicly announce the intention to make any offer, sale, pledge or disposition, or to enter into any transaction, swap, hedge; or |
· |
other arrangement relating to any of our securities. |
Notwithstanding these limitations, these shares
of common stock may be transferred under limited circumstances, including, without limitation, by gift, will or intestate succession.
In addition, we have agreed that (i) we will
not conduct any issuances of our shares of common stock for a period of 60 days following closing of this offering, and that (ii) we
will not enter into a variable rate transaction for a period of two years following the closing of this offering, with the exception of an at-the-market transaction, which we will not enter into for a period of eight months following the closing
of this offering.
Other Relationships
The placement agent and certain of its affiliates
are full service financial institutions engaged in various activities, which may include securities trading, commercial and investment
banking, financial advisory, investment management, investment research, principal investment, hedging, financing and brokerage activities.
The placement agent and certain of its affiliates have, from time to time, performed, and may in the future perform, various commercial
and investment banking and financial advisory services for us and our affiliates, for which they received or will receive customary fees
and expenses.
In the ordinary course of their various business
activities, the placement agent and certain of its affiliates may make or hold a broad array of investments and actively trade debt and
equity securities (or related derivative securities) and financial instruments (including bank loans) for their own account and for the
accounts of their customers, and such investment and securities activities may involve securities and/or instruments issued by us and
our affiliates. If the placement agent or its affiliates have a lending relationship with us, they routinely hedge their credit exposure
to us consistent with their customary risk management policies. The placement agent and its affiliates may hedge such exposure by entering
into transactions that consist of either the purchase of credit default swaps or the creation of short positions in our securities or
the securities of our affiliates, including potentially the securities offered hereby. Any such short positions could adversely affect
future trading prices of the securities offered hereby. The placement agent and certain of its affiliates may also communicate independent
investment recommendations, market color or trading ideas and/or publish or express independent research views in respect of such securities
or instruments and may at any time hold, or recommend to clients that they acquire, long and/or short positions in such securities and
instruments.
LEGAL MATTERS
Mintz, Levin, Cohn, Ferris, Glovsky and Popeo,
P.C., New York, New York, which has acted as our counsel in connection with this offering, will pass upon the validity of the securities
offered hereby. Sullivan & Worcester LLP, New York, New York, is counsel to the placement agent in connection with this offering.
EXPERTS
The consolidated financial statements of SELLAS
Life Sciences Group, Inc. (the “Company”) incorporated in this Prospectus Supplement by reference from the Annual Report
on Form 10-K of the Company for the year ended December 31, 2022, have been audited by Moss Adams LLP, an independent registered
public accounting firm, as stated in their report (which report expresses an unqualified opinion and includes an explanatory paragraph
related to a going concern uncertainty), which is incorporated herein by reference. Such consolidated financial statements are incorporated
by reference in reliance upon the report of such firm given their authority as experts in accounting and auditing.
WHERE YOU CAN FIND MORE INFORMATION
This prospectus supplement and the accompanying
prospectus are part of a registration statement on Form S-3 we filed with the SEC under the Securities Act and do not contain all
of the information set forth in the registration statement and the exhibits thereto. Whenever a reference is made in this prospectus supplement
or the accompanying prospectus to any of our contracts, agreements or other documents, the reference may not be complete and you should
refer to the exhibits that are a part of the registration statement or the exhibits to the reports or other documents incorporated by
reference therein. For further information with respect to us and the common stock we are offering under this prospectus supplement, we
refer you to the registration statement and the exhibits and schedules filed as a part of the registration statement.
We file annual, quarterly and current reports,
proxy statements and other information with the SEC. The SEC maintains a website that contains reports, proxy statements and other information
regarding issuers that file electronically with the SEC, including us. The address of the SEC website is www.sec.gov.
Copies of certain information filed by us with
the SEC are also available on our website at www.sellaslifesciences.com. Information contained in or accessible through our website does
not constitute a part of this prospectus supplement or the accompanying prospectus and is not incorporated by reference into this prospectus
supplement or the accompanying prospectus.
INCORPORATION OF CERTAIN INFORMATION BY REFERENCE
The SEC allows us to “incorporate by reference”
information from other documents that we file with it, which means that we can disclose important information to you by referring you
to those documents instead of having to repeat the information in this prospectus supplement or the accompanying prospectus. The information
incorporated by reference is considered to be part of this prospectus supplement and the accompanying prospectus, and later information
that we file with the SEC will automatically update and supersede this information. We incorporate by reference the documents listed below
and any future filings made by us with the SEC (other than Current Reports or portions thereof furnished under Item 2.02 or Item 7.01
of Form 8-K and exhibits filed on such form that are related to such items and other portions of documents that are furnished, but
not filed, pursuant to applicable rules promulgated by the SEC) that are filed by us with the SEC pursuant to Sections 13(a), 13(c),
14 or 15(d) of the Exchange Act after the filing and concurrent effectiveness of the registration statement but prior to the termination
of all offerings covered by this prospectus supplement:
| · | our Quarterly Reports on Form 10-Q for the quarters ended March 31, 2023, filed with the SEC on May 11, 2023, June 30,
2023, filed with the SEC on August 10, 2023, and September 30, 2023, filed with the SEC on November 9, 2023; |
| · | our Current Reports on Form 8-K filed with the SEC on June 21,
2023, October 13,
2023; October 16,
2023, October 31,
2023, December 8,
2023, December 13,
2023, December 22,
2023 and January 3, 2024 (except for any information furnished under Items 2.02 or 7.01 and exhibits furnished thereto);
and |
Any statement contained in a document incorporated
by reference herein shall be deemed to be modified or superseded for all purposes to the extent that a statement contained in this prospectus
or in any other subsequently filed document which is also incorporated or deemed to be incorporated by reference, modifies or supersedes
such statement. Any statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part
of this prospectus. You may request a copy of these filings (other than an exhibit to a filing unless that exhibit is specifically incorporated
by reference into that filing) at no cost by writing, telephoning or e-mailing us at the following address or telephone number:
SELLAS Life Sciences Group, Inc.,
Attention: Corporate Secretary
7 Times Square
Suite 2503
New York, New York 10036
(646) 200-5278
You may also access these documents, free of charge
on the SEC’s website at www.sec.gov or on our website at www.sellaslifesciences.com. Information contained on our website is not
incorporated by reference into this prospectus, and you should not consider any information on, or that can be accessed from, our website
as part of this prospectus or any accompanying prospectus supplement.
$150,000,000
Common Stock
Preferred Stock
Debt Securities
Warrants
Rights
Units
From time to time, we may offer and sell up to an aggregate amount
of $150,000,000 of any combination of the securities described in this prospectus in one or more offerings. We may also offer such securities
as may be issuable upon conversion, redemption, repurchase, exchange or exercise of any securities registered hereunder, including any
applicable anti-dilution provisions.
This prospectus provides a general description of the securities we
may offer. Each time we sell securities pursuant to this prospectus, we will provide the specific terms of these offerings in one or more
supplements to this prospectus. We may also authorize one or more free writing prospectuses to be provided to you in connection with these
offerings. The prospectus supplement and any related free writing prospectus may also add, update or change information contained in this
prospectus. You should carefully read this prospectus, the applicable prospectus supplement and any related free writing prospectus, as
well as any documents incorporated by reference, before buying any of the securities being offered.
This prospectus may not be used to consummate a sale of securities
unless it is accompanied by the applicable prospectus supplement.
Our common stock is traded on the Nasdaq Capital Market under the symbol
“SLS.” On April 15, 2021, the closing price of our common stock, as reported on the Nasdaq Capital Market, was $7.89 per share.
The applicable prospectus supplement will contain information, where applicable, as to any other listings on the Nasdaq Capital Market
or any securities market or other exchange of the securities, if any, covered by the prospectus supplement.
Investing in our securities involves a high degree of risk. You
should review carefully the risks and uncertainties described under the heading “Risk Factors” contained in this prospectus
beginning on page 7 and any applicable prospectus supplement and in any free writing prospectuses we have authorized for use in connection
with a specific offering, and under similar headings in the other documents that are incorporated by reference into this prospectus.
The securities may be sold directly by us to
investors, through agents designated from time to time or to or through underwriters or dealers, on a continuous or delayed basis.
For additional information on the methods of sale, you should refer to the section titled “Plan of Distribution” in this
prospectus. If any agents or underwriters are involved in the sale of any securities with respect to which this prospectus is being
delivered, the names of such agents or underwriters and any applicable fees, commissions, discounts and over-allotment options will
be set forth in a prospectus supplement. The price to the public of such securities and the net proceeds we expect to receive from
such sale will also be set forth in a prospectus supplement.
Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation
to the contrary is a criminal offense.
The date of this prospectus is April 29,
2021.
TABLE OF CONTENTS
ABOUT THIS PROSPECTUS
This prospectus is part of a registration statement that we filed with
the Securities and Exchange Commission, or the SEC, using a “shelf” registration process. Under this shelf registration process,
we may, from time to time, offer and sell, either individually or in combination, in one or more offerings, up to a total dollar amount
of $150,000,000 of any combination of the securities described in this prospectus. This prospectus provides you with a general description
of the securities we may offer.
Each time we offer securities under this prospectus, we will provide
a prospectus supplement that will contain more specific information about the terms of that offering. We may also authorize one or more
free writing prospectuses to be provided to you that may contain material information relating to these offerings. The prospectus supplement
and any related free writing prospectus that we may authorize to be provided to you may also add, update or change any of the information
contained in this prospectus or in the documents that we have incorporated by reference into this prospectus. We urge you to carefully
read this prospectus, any applicable prospectus supplement and any related free writing prospectuses we have authorized for use in connection
with a specific offering, together with the information incorporated herein by reference as described under the heading “Incorporation
By Reference,” before buying any of the securities being offered.
This prospectus may not be used to consummate a sale of securities
unless it is accompanied by a prospectus supplement.
You should rely only on the information contained in, or incorporated
by reference into, this prospectus and any applicable prospectus supplement, along with the information contained in any free writing
prospectuses we have authorized for use in connection with a specific offering. We have not authorized anyone to provide you with information
in addition to or different from that contained in this prospectus, any applicable prospectus supplement and any related free writing
prospectus. We take no responsibility for, and can provide no assurances as to the reliability of, any information not contained in this
prospectus, any applicable prospectus supplement or any related free writing prospectus that we may authorize to be provided to you. This
prospectus is an offer to sell only the securities offered hereby, but only under circumstances and in jurisdictions where it is lawful
to do so.
You should assume that the information in this prospectus, any applicable
prospectus supplement or any related free writing prospectus, is accurate only as of the date on the front of the document and that any
information incorporated by reference is accurate only as of the date of the document incorporated by reference, regardless of the time
of delivery of this prospectus, any applicable prospectus supplement or any related free writing prospectus, or any sale of a security.
Our business, financial condition, results of operations and prospects may have changed since those dates.
To the extent there is a conflict between the information contained
in this prospectus, on the one hand, and the information contained in any document incorporated by reference filed with the SEC before
the date of this prospectus, on the other hand, you should rely on the information in this prospectus. If any statement in a document
incorporated by reference is inconsistent with a statement in another document incorporated by reference having a later date, the statement
in the document having the later date modifies or supersedes the earlier statement.
This prospectus contains summaries of certain provisions contained
in some of the documents described herein, but reference is made to the actual documents for complete information. All of the summaries
are qualified in their entirety by the actual documents. Copies of some of the documents referred to herein have been filed, will be filed
or will be incorporated by reference as exhibits to the registration statement of which this prospectus is a part, and you may obtain
copies of those documents as described below in the section titled “Where You Can Find More Information.”
The names “SELLAS Life Sciences Group, Inc.,” “SELLAS,”
the SELLAS logo, and other trademarks or service marks of SELLAS Life Sciences Group, Inc. appearing in this prospectus are the property
of SELLAS Life Sciences Group, Inc. Other trademarks, service marks or trade names appearing in this prospectus are the property of their
respective owners. We do not intend the use or display of other companies’ trade names, trademarks or service marks to imply a relationship
with, or endorsement or sponsorship of or by either, of these other companies.
PROSPECTUS SUMMARY
This summary highlights information contained elsewhere in this
prospectus or incorporated by reference in this prospectus. This summary provides an overview of selected information and does not contain
all of the information you should consider before investing in our securities. You should read this entire prospectus and the applicable
prospectus supplement carefully, especially the sections titled “Risk Factors” and our consolidated financial statements and
related notes included elsewhere in this prospectus, the applicable prospectus supplement and the documents incorporated by reference
therein before making an investment decision. Except as otherwise indicated or unless the context otherwise requires, references to “company,”
“we,” “us,” “our” or “SELLAS,” refer to SELLAS Life Sciences Group, Inc. and its consolidated
subsidiaries.
Overview
We are a late-stage clinical biopharmaceutical
company focused on developing novel cancer immunotherapeutics for a broad range of cancer indications. Our product candidates currently
include galinpepimut-S and nelipepimut-S.
Galinpepimut-S, or GPS
Our lead product candidate, galinpepimut-S, or
GPS, is a cancer immunotherapeutic agent licensed from Memorial Sloan Kettering Cancer Center, or MSK, that targets the Wilms tumor 1,
or WT1, protein, which is present in 20 or more cancer types. Based on its mechanism of action as a directly immunizing agent, GPS has
potential as a monotherapy or in combination with other immunotherapeutic agents to address a broad spectrum of hematologic, or blood,
cancers and solid tumor indications.
In January 2020, we commenced in the United States
a Phase 3 clinical trial, the REGAL study, for GPS monotherapy in patients with acute myeloid leukemia, or AML, in the maintenance
setting after achievement of second complete remission, or CRem2, following successful completion of second-line antileukemic therapy.
We expect this study will be used as the basis for submission of a Biologics License Application, or BLA, subject to a statistically significant
and clinically meaningful data outcome and agreement with the U.S. Food & Drug Administration, or the FDA. In the second half of 2020,
we received approval from each of the French and German regulatory authorities to advance the REGAL study in France and Germany, respectively. We
expect approvals from additional European health authorities in early 2021 which will allow us to expand AML patient enrollment for the
REGAL study in Europe. We plan to enroll approximately 116 patients at up to approximately 135 clinical sites primarily in the United
States and Europe with a planned interim safety and futility analysis after 80 events (deaths) which we anticipate will take place in
the first half of 2022, provided that the ongoing COVID-19 pandemic does not significantly adversely impact our projected timeline for
enrollment.
In December 2020, we entered into an exclusive
license agreement with 3D Medicines Inc., a China-based biopharmaceutical company developing next-generation immuno-oncology drugs, for
the development and commercialization of GPS, as well as the Company’s next generation heptavalent immunotherapeutic GPS+, which
is at preclinical stage, across all therapeutic and diagnostic uses in the Greater China territory (mainland China, Hong Kong, Macau and
Taiwan). We have retained sole rights to GPS and GPS+ outside of the Greater China area.
In December 2018, pursuant to a Clinical Trial
Collaboration and Supply Agreement, we initiated a Phase 1/2 multi-arm "basket" type clinical study of GPS in combination with
Merck & Co., Inc.’s anti-PD-1 therapy, Keytruda® (pembrolizumab). The tumor type currently being studied is ovarian
cancer (second or third line). We reported initial data from this study in December 2020 and we expect to report further clinical and
immunobiological data by the end of the first half of 2021. We, together with Merck, have determined not to pursue the following indications
as part of the basket study: colorectal cancer, triple negative breast cancer, small cell lung cancer, or SCLC, or AML, and we are exploring
other additional potential indications to investigate in the study.
In February 2020, a Phase I open-label investigator-sponsored
clinical trial of GPS, in combination with Bristol-Myers Squibb’s anti-PD-1 therapy, nivolumab (Opdivo®), in patients with malignant
pleural mesothelioma, or MPM, who harbor relapsed or refractory disease after having received frontline standard of care multimodality
therapy was commenced at MSK. In December 2020, we announced initial data from this study and we expect to report further clinical
and immunobiological data by the end of the first half of 2021.
GPS was granted Orphan Drug Product Designations
from the FDA, as well as Orphan Medicinal Product Designations from the European Medicines Agency, or EMA, for GPS in AML, MPM, and multiple
myeloma, or MM, as well as Fast Track Designation for AML, MPM, and MM from the FDA.
Nelipepimut-S, or NPS
Nelipepimut-S, or NPS, is a cancer immunotherapy
targeting the human epidermal growth factor receptor 2, or HER2, expressing cancers. Data presented in 2018 from a Phase 2b clinical trial
of the combination of trastuzumab (Herceptin®) plus NPS in HER2 low expressing (1+ or 2+ per immunohistochemistry, or IHC) breast
cancer patients in the adjuvant setting to prevent recurrences showed a clinically and statistically significant improvement in the disease-free
survival, or DFS, rate for the TNBC cohort at 24 months for patients treated with NPS plus trastuzumab of 92.6% compared to 70.2% for
those treated with trastuzumab alone. Following discussions with the FDA and based upon written feedback from the FDA and on the totality
of clinical, safety and translational NPS data to date, we have finalized the design and plan for a Phase 3 registration-enabling study
of NPS in combination with trastuzumab for the treatment of patients with TNBC in the adjuvant setting after standard treatment. If
successful, we believe this study may be considered as the basis for a BLA submission to the FDA. We are seeking out-licensing opportunities
to fund and conduct the future clinical development of NPS in order to maximize the potential of the program and we do not plan to conduct
and fund a Phase 3 program for NPS on our own.
FBP-targeting bivalent vaccine (GALE-301/-302)
In order to prioritize development of our core
assets, we determined to cease development of GALE-301 and GALE-302, cancer immunotherapies that target the E39 peptide derived from the
folate binding protein, or FBP, which were licensed in from The Henry M. Jackson Foundation, or HJF, and the MD Anderson Cancer Center,
or MDACC. We entered into a Termination Agreement with HJF and MDACC in February 2021.
The chart below summarizes the current status
of our clinical development pipeline:
Impact of COVID-19
On March 11, 2020, the World Health
Organization declared the outbreak of a new coronavirus to be a “pandemic”. The COVID-19 pandemic continues to present
substantial public health and economic challenges around the world which have impacted, and will continue to impact, millions of
individuals and business worldwide. Efforts to contain the spread of the coronavirus since March 2020 have led to travel bans and
restrictions, quarantines, shelter-in-place orders and shutdowns. As we have historically functioned operationally as a semi-virtual
company, the transition to “work-from-home” for our employees has not materially altered our business operations. We
have implemented a return-to-work policy in compliance with federal, state and local requirements and guidance which provides for a
hybrid of remote and in-office work, and we expect to operate on such a semi-virtual basis for at least the first half of 2021. We
are continuously monitoring the impact of the pandemic on our clinical development programs. Our Phase 3 REGAL study is progressing,
with the necessary work to activate additional sites in the United States and Europe continuing. Throughout 2020 and early 2021, we
initiated additional sites as planned. However, we have observed that clinical site initiations and patient enrollment may be
delayed due to prioritization of hospital resources towards the COVID-19 pandemic. Clinicians and patients may not be able to comply
with clinical trial protocols if quarantines impede patient movement or interrupt operations at sites. Accordingly, we are uncertain
at this time the extent to which these newly initiated sites will be fully operational, which we believe could have an impact on the
projected timing of the REGAL study. Additionally, several European Union countries in which we plan to initiate clinical sites,
including Germany, France, and Italy, continue to impose restrictions in response to the continued surge in coronavirus cases
throughout the European Union. We believe that the COVID-19 pandemic has not materially impacted our efforts to out-license NPS. The
full extent to which the COVID-19 pandemic directly or indirectly impacts our business, results of operations and financial
condition will depend on future developments that are highly uncertain, subject to change and cannot be predicted with confidence,
including the actions taken to contain or treat COVID-19, the overall duration of the outbreak, the availability, effectiveness and
uptake of vaccines for COVID-19, the emergence of new variants of COVID-19 and whether existing vaccines are effective with respect
to such variants, and the emergence of new geographic hotspots where the coronavirus is spreading more rapidly. In particular, the
continued spread of the coronavirus globally could adversely impact our clinical trial operations and could have an adverse impact
on our business and the financial results.
Recent Developments
Proceeds from Warrant Exercises
Subsequent to December 31, 2020, we received $3.0
million of gross proceeds from the exercise of 830,200 warrants to acquire shares of common stock at a weighted average exercise price
of $3.61.
3D Medicines Milestone Payment
In February 2021, we triggered a milestone in
the amount of $1.0 million related to the completion of a technology transfer plan under our license agreement with 3D Medicines, Inc.
We received payment of this milestone during the first quarter of 2021.
Corporate Information
We were incorporated on April 3, 2006 in Delaware
as Argonaut Pharmaceuticals, Inc. On November 28, 2006, we changed our name to RXi Pharmaceuticals Corporation and began operations January
2007. On September 26, 2011, we changed our name to Galena Biopharma, Inc. In December 2017, we completed the Merger with Private SELLAS,
and changed our name to “SELLAS Life Sciences Group, Inc.”
Our principal executive offices are located at 7 Times Square, Suite
2503, New York, NY 10036, and our phone number is (646) 200-5278. Our website address is www.sellaslife.com. The information contained
on, or that can be accessed through, our website is not part of, and is not incorporated by reference into this prospectus and should
not be considered to be part of this prospectus.
The Securities We May Offer
We may offer shares of our common stock and preferred stock, various
series of debt securities and/or warrants, rights or units to purchase any such securities, either individually or in combination, up
to a total dollar amount of $150,000,000, from time to time under this prospectus, together with any applicable prospectus supplement
and any related free writing prospectuses, at prices and on terms to be determined by market conditions at the time of any offering. We
may also offer common stock, preferred stock and/or debt securities upon the exercise of warrants, rights or units. This prospectus provides
you with a general description of the securities we may offer. Each time we offer a type or series of securities under this prospectus,
we will provide a prospectus supplement that will describe the specific amounts, prices and other important terms of the securities, including,
to the extent applicable:
| · | designation or classification; |
| · | aggregate principal amount or aggregate offering price; |
| · | maturity date, if applicable; |
| · | original issue discount, if any; |
| · | rates and times of payment of interest or dividends, if any; |
| · | redemption, conversion, exercise, exchange or sinking fund terms, if any; |
| · | conversion or exchange prices or rates, if any, and, if applicable, any provisions for changes to or adjustments in the conversion
or exchange prices or rates and in the securities or other property receivable upon conversion or exchange; |
| · | restrictive covenants, if any; |
| · | voting or other rights, if any; and |
| · | material or special U.S. federal income tax considerations, if any. |
Any applicable prospectus supplement and any related free writing prospectus
that we may authorize to be provided to you may also add, update or change any of the information contained in this prospectus or in the
documents we have incorporated by reference. However, no prospectus supplement or free writing prospectus will offer any security that
is not registered and described in this prospectus at the time of the effectiveness of the registration statement of which this prospectus
is a part.
This prospectus may not be used to consummate a sale of our securities
unless it is accompanied by a prospectus supplement.
We may sell the securities directly to investors or to or through agents,
underwriters or dealers. We, and our agents or underwriters, reserve the right to accept or reject all or part of any proposed purchase
of securities. If we do offer securities to or through agents or underwriters, we will include in the applicable prospectus supplement:
| · | the names of those agents or underwriters; |
| · | applicable fees, discounts and commissions to be paid to them; |
| · | details regarding over-allotment options, if any; and |
| · | the estimated net proceeds to us. |
Common Stock
We may issue shares of our common stock from time to time. The holders
of our common stock are entitled to one vote for each share held of record on all matters submitted to a vote of stockholders. Subject
to preferences that may be applicable to any then outstanding shares of preferred stock, the holders of common stock are entitled to receive
ratably such dividends as may be declared by our board of directors out of legally available funds. Upon our liquidation, dissolution
or winding up, holders of our common stock are entitled to share ratably in all assets legally available for distribution to stockholders
remaining after payment of liabilities and the liquidation preferences of any outstanding shares of preferred stock. Holders of common
stock have no preemptive rights and no right to convert their common stock into any other securities. There are no redemption or sinking
fund provisions applicable to our common stock. When we issue shares of common stock under this prospectus, the shares will be fully paid
and non-assessable. The rights, preferences and privileges of the holders of common stock are subject to, and may be adversely affected
by, the rights of the holders of shares of any series of preferred stock that we may designate in the future. In this prospectus, we have
summarized certain general features of the common stock under “Description of Capital Stock—Common Stock.” We urge you,
however, to read the applicable prospectus supplement (and any related free writing prospectus that we may authorize to be provided to
you) related to any common stock being offered.
Preferred Stock
We may issue shares of our preferred stock from time to time, in
one or more series. If we sell any series of preferred stock under this prospectus and any applicable prospectus supplement, our
board of directors will determine the designations, voting powers, preferences and rights of the preferred stock being offered, as
well as the qualifications, limitations or restrictions thereof, including dividend rights, conversion rights, preemptive rights,
terms of redemption or repurchase, liquidation preferences, sinking fund terms and the number of shares constituting any series or
the designation of any series. Convertible preferred stock may be convertible into our common stock or exchangeable for our other
securities. Conversion may be mandatory or at the holder’s option and would be at prescribed conversion rates.
We will file as an exhibit to the registration statement of which this
prospectus is a part, or will incorporate by reference from reports that we file with the SEC, the form of the certificate of designation
that describes the terms of the series of preferred stock that we are offering before the issuance of the related series of preferred
stock. We urge you to read the applicable prospectus supplement (and any free writing prospectus that we may authorize to be provided
to you) related to the series of preferred stock being offered, as well as the complete certificate of designation that contains the terms
of the applicable series of preferred stock.
Debt Securities
We may issue debt securities from time to time, in one or more series,
as either senior or subordinated debt or as senior or subordinated convertible debt. The senior debt securities will rank equally with
any other unsecured and unsubordinated debt. The subordinated debt securities will be subordinate and junior in right of payment, to the
extent and in the manner described in the instrument governing the debt, to all of our senior indebtedness. Convertible debt securities
will be convertible into our common stock or other securities. Conversion may be mandatory or at the holder’s option and would be
at prescribed conversion rates.
Any debt securities issued under this prospectus will be issued under
one or more documents called indentures, which are contracts between us and a national banking association or other eligible party, as
trustee. Forms of senior and subordinated indentures have been filed as exhibits to the registration statement of which this prospectus
is a part, and supplemental indentures and forms of debt securities containing the terms of the debt securities being offered will be
filed as exhibits to the registration statement of which this prospectus is a part or will be incorporated by reference from reports that
we file with the SEC. In this prospectus, we have summarized certain general features of the debt securities under “Description
of Debt Securities.” We urge you, however, to read the applicable prospectus supplement (and any related free writing prospectus
that we may authorize to be provided to you) related to the series of debt securities being offered, as well as the complete indentures
that contain the terms of the debt securities.
Warrants
We may issue warrants for the purchase of common stock, preferred stock
and/or debt securities in one or more series. We may issue warrants independently or together with common stock, preferred stock and/or
debt securities, and the warrants may be attached to or separate from these securities. Forms of the warrant agreements and forms of warrant
certificates containing the terms of the warrants being offered have been filed as exhibits to the registration statement of which this
prospectus is a part, and supplemental warrant agreements and forms of warrant certificates will be filed as exhibits to the registration
statement of which this prospectus is a part or will be incorporated by reference from reports that we file with the SEC. We urge you
to read the applicable prospectus supplement (and any free writing prospectus that we may authorize to be provided to you) related to
the particular series of warrants being offered, as well as the complete warrant agreements and warrant certificates that contain the
terms of the warrants.
Any warrants issued under this prospectus may be evidenced by warrant
certificates. Warrants may also be issued under an applicable warrant agreement that we enter into with a warrant agent. We will indicate
the name and address of the warrant agent, if applicable, in the prospectus supplement relating to the particular series of warrants being
offered.
Rights
We may issue rights for the purchase of common stock, preferred
stock or debt securities. We may issue subscription rights independently or together with common stock, preferred stock and/or debt
securities, and the rights may be attached to or separate from these securities. Each series of rights will be issued under a
separate rights agreement to be entered into between us and a bank or trust company, as rights agent. The rights agent will act
solely as our agent in connection with the certificates relating to the rights of the series of certificates and will not assume any
obligation or relationship of agency or trust for or with any holders of rights certificates or beneficial owners of rights. We urge
you to read the applicable prospectus supplement (and any free writing prospectus that we may authorize to be provided to you)
related to the particular series of rights being offered, as well as the complete rights agreements that contain the terms of the
rights.
Units
We may issue units consisting of common stock, preferred stock, one
or more debt securities, warrants or rights for the purchase of common stock, preferred stock and/or debt securities in one or more series,
in any combination. Each unit will be issued so that the holder of the unit is also the holder of each security included in the unit.
Thus, the holder of a unit will have the rights and obligations of a holder of each security included in the unit. The unit agreement
under which a unit is issued may provide that the securities included in the unit may not be held or transferred separately, at any time
or at any time before a specified date. We urge you to read the applicable prospectus supplement (and any free writing prospectus that
we may authorize to be provided to you) related to the particular series of units being offered, as well as the complete unit agreements
that contain the terms of the units.
Use of Proceeds
Except as described in any applicable prospectus supplement or in any
free writing prospectuses we have authorized for use in connection with a specific offering, we currently intend to use the net proceeds
from the sale of the securities offered by us hereunder, if any, for working capital and general corporate purposes, including research
and development of our product candidates (including clinical trial activities), and general and administrative expenses. See “Use
of Proceeds” in this prospectus.
Nasdaq Capital Market Listing
Our common stock is listed on the Nasdaq Capital Market under the symbol
“SLS.” The applicable prospectus supplement will contain information, where applicable, as to other listings, if any, on the
Nasdaq Capital Market or other securities exchange of the securities covered by the applicable prospectus supplement.
RISK FACTORS
Investing in our securities involves a high degree of risk. Before
deciding whether to invest in our securities, you should carefully consider the risks described in the documents incorporated by reference
in this prospectus and any applicable prospectus supplement, as well as other information we include or incorporate by reference into
this prospectus and any applicable prospectus supplement, before making an investment decision. Our business, financial condition or results
of operations could be materially adversely affected by any of these risks. The trading price of our securities could decline due to the
occurrence of any of these risks, and you may lose all or part of your investment. This prospectus and the documents incorporated herein
by reference also contain forward-looking statements that involve risks and uncertainties. Actual results could differ materially from
those anticipated in these forward-looking statements as a result of certain factors, including the risks described in the documents incorporated
herein by reference, including in (1) our most recent Annual Report on Form 10-K on file with the SEC, (2) our most recent Quarterly Reports
on Form 10-Q on file with the SEC and (3) any amendments thereto reflected in subsequent filings with the SEC, all of which are incorporated
by reference into this prospectus in their entirety, together with other information in this prospectus, the applicable prospectus supplement
and the documents incorporated by reference that we may authorize for use in connection with a specific offering. Please also read carefully
the section below entitled “Special Note Regarding Forward-Looking Statements.”
SPECIAL NOTE REGARDING
FORWARD-LOOKING STATEMENTS
This prospectus, the applicable prospectus supplement, and the documents
incorporated by reference contain forward-looking statements about us and our industry that involve substantial risks and uncertainties.
All statements other than statements of historical facts contained in this prospectus, the applicable prospectus supplement, and the documented
incorporated by reference, including statements regarding our future financial condition, business strategy and plans, and objectives
of management for future operations, are forward-looking statements. In some cases, you can identify forward-looking statements by terminology
such as “aim,” “anticipate,” “assume,” “believe,” “contemplate,” “continue,”
“could,” “design,” “due,” “estimate,” “expect,” “goal,” “intend,”
“may,” “objective,” “plan,” “predict,” “positioned,” “potential,”
“seek,” “should,” “target,” “will,” “would” and other similar expressions
that are predictions of or indicate future events and future trends, or the negative of these terms or other comparable terminology.
We have based these forward-looking statements largely on our current
expectations and projections about future events and financial trends that we believe may affect our financial condition, results of operations,
business strategy and financial needs. These forward-looking statements are subject to a number of known and unknown risks, uncertainties
and assumptions, including risks described in the section titled “Risk Factors” contained in our most recent Annual Report
on Form 10-K and Quarterly Reports on Form 10-Q and incorporated by reference in this prospectus, as the same may be amended, supplemented
or superseded by the risks and uncertainties described under similar headings in the other documents that are filed after the date hereof
and incorporated by reference into this prospectus, regarding, among other things:
| · | our ability to continue to operate despite incurring substantial losses since our inception and our expectation that we will continue
to incur substantial and increasing losses for the foreseeable future; |
| · | our ability to continue as a going concern; |
| · | our ability to obtain the substantial additional financing necessary to achieve our goals; |
| · | whether we will generate revenues and achieve profitability in the future; |
| · | the ability of investors to evaluate the success of our business and to assess our future viability given our limited operating history; |
| · | our expectations regarding our continuing to incur significant operating and non-operating expenses; |
| · | the impact of the COVID-19 pandemic; |
| · | the initiation of legal or administrative actions against us; |
| · | our ability to use net operating losses to offset future taxable income; |
| · | our ability to comply with the regulatory and environmental provisions and laws to which we are subject; |
| · | our ability to obtain regulatory approval of our product candidates; |
| · | whether the results of our clinical trials will be sufficient to support domestic or global regulatory approvals; |
| · | the initiation, timing, progress and results of our pre-clinical and clinical trials; |
| · | the success of our lead product candidate, GPS, and our ability to successfully complete clinical trials and obtain regulatory approval
for our other product candidates; |
| · | whether our product development program will uncover all possible adverse events that patients who take our product candidates may
experience; |
| · | whether we can maintain Orphan Drug exclusivity and Fast Track designation for certain of our product candidates and whether we will
receive orphan drug product designation and fast track designation for additional product candidates should we seek such designations; |
| · | our ability to successfully identify, acquire, develop or commercialize new potential product candidates; |
| · | our ability to realize benefits from strategic alliances that we may form in the future; |
| · | whether we can continue to rely on third parties to conduct our preclinical studies and clinical trials; |
| · | whether we can continue to rely on third parties to manufacture our product candidates; |
| · | whether we can rely on third parties to develop or potentially commercialize some or all of our product candidates; |
| · | developments or disputes concerning our intellectual property or other proprietary rights; |
| · | our expectations regarding the potential market size and the size of the patient populations for our product candidates, if approved,
for commercial use; |
| · | the impact of legislation developments regarding pricing regulations; |
| · | the implementation of our business model and strategic plans for our business and product candidates; |
| · | our ability to maintain and establish collaborations or obtain additional funding; |
| · | the market price and value of our common stock; |
| · | our ability to compete in the markets we serve; and |
| · | other factors that may impact our financial results. |
These risks are not exhaustive. Other sections of this prospectus,
the applicable prospectus supplement, or the documents incorporated herein by reference may include additional factors that could harm
our business and financial performance. Moreover, we operate in a very competitive and rapidly changing environment. New risk factors
emerge from time to time, and it is not possible for our management to predict all risk factors, nor can we assess the impact of all factors
on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those
contained in, or implied by, any forward-looking statements.
You should not rely upon forward-looking statements as predictions
of future events. We cannot assure you that the events and circumstances reflected in the forward-looking statements will be achieved
or occur. Although we believe that the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee future
results, levels of activity, performance or achievements. Except as required by law, we undertake no obligation to update publicly any
forward-looking statements for any reason after the date of this prospectus or to conform these statements to actual results or to changes
in our expectations.
You should carefully read this prospectus, and the applicable
prospectus supplement, together with the information incorporated herein by reference as described under the heading
“Incorporation by Reference,” as well as the documents filed as exhibits to the registration statement of which this
prospectus is a part with the understanding that our actual future results, levels of activity, performance and achievements may be
materially different from what we expect. We qualify all of our forward-looking statements by these cautionary statements.
Except as required by law, we assume no obligation to update these
forward-looking statements publicly, or to update the reasons actual results could differ materially from those anticipated in these forward-looking
statements, even if new information becomes available in the future.
USE OF PROCEEDS
Except as described in any applicable prospectus supplement or in any
related free writing prospectuses we may authorize for use in connection with a specific offering, we currently intend to use the net
proceeds from the sale of the securities offered by us hereunder, if any, for working capital, capital expenditures and other general
corporate purposes including research and development of our product candidates (including clinical trial activities), and general and
administrative expenses. In addition, we may use a portion of the proceeds for the acquisition of, or investment in, technologies, solutions
or businesses that complement our business, although we have no present commitments or agreements to enter into any such acquisitions
or investments. As of the date of this prospectus, we cannot specify with certainty all of the particular uses for the net proceeds to
us from the sale of the securities offered by us hereunder. We will set forth in the applicable prospectus supplement or free writing
prospectus our intended use for the net proceeds received from the sale of any securities sold pursuant to the prospectus supplement or
free writing prospectus.
DILUTION
We will set forth in a prospectus supplement the following information
regarding any material dilution of the equity interests of investors purchasing securities in an offering under this prospectus:
| · | the net tangible book value per share of our equity securities before and after the offering; |
| · | the amount of the increase in such net tangible book value per share attributable to the cash payments made by purchasers in the offering;
and |
| · | the amount of the immediate dilution from the public offering price which will be absorbed by such purchasers. |
DESCRIPTION OF
CAPITAL STOCK
The following description of our capital stock summarizes the material
terms and provisions of our common stock and our preferred stock. For the complete terms of our common stock, please refer to our amended
and restated certificate of incorporation and our amended and restated bylaws, each as amended to date, that are incorporated by reference
into the registration statement of which this prospectus is a part or may be incorporated by reference into this prospectus. The terms
of these securities may also be affected by the Delaware General Corporation Law. The summary below is qualified in its entirety by reference
to our amended and restated certificate of incorporation and amended and restated bylaws, which are filed as exhibits to the registration
statement of which this prospectus is a part.
General
Our amended and restated certificate of incorporation authorizes us
to issue up to 350,000,000 shares of common stock, $0.0001 par value per share, and 5,000,000 shares of preferred stock, $0.0001 par value
per share.
As of December 31, 2020, there were:
| · | 14,254,554 shares of common stock outstanding; |
| · | 0 shares of preferred stock outstanding; |
| · | 207,520 shares of common stock issuable upon exercise of outstanding options; |
| · | 170,000 shares of common stock issuable upon vesting of outstanding restricted stock units; and |
| · | warrants outstanding for the purchase of an aggregate of 1,391,650 shares of common stock. |
Common stock
Voting
Each holder of our common stock is entitled to one vote for each share
on all matters submitted to a vote of the stockholders, including the election of directors. Our amended and restated certificate of incorporation
and amended and restated bylaws do not provide for cumulative voting rights. Because of this absence of cumulative voting, the holders
of a majority of the shares of common stock entitled to vote in any election of directors can elect all the directors standing for election,
if they should so choose.
Dividends
Subject to preferences that may be applicable to any then outstanding
shares of preferred stock, holders of common stock are entitled to receive ratably those dividends, if any, as may be declared from time
to time by our board of directors out of legally available funds.
Liquidation
In the event of our dissolution or liquidation, holders of common stock
will be entitled to share ratably in the net assets legally available for distribution to stockholders after the payment of all our debts
and other liabilities and the satisfaction of any preferential rights that may be granted to the holders of any then outstanding shares
of preferred stock.
Rights and Preferences
Holders of common stock have no preemptive, conversion or subscription
rights, and there are no redemption or sinking fund provisions applicable to the common stock. The rights, preferences, and privileges
of the holders of common stock are subject to, and may be adversely affected by, the rights of the holders of shares of any series of
preferred stock.
Fully-paid
All of the outstanding shares of our common stock are, and the shares
of common stock issued upon the conversion of any securities convertible into our common stock will be, fully paid and non-assessable.
The shares of common stock offered by this prospectus or upon the conversion of any preferred stock or debt securities or exercise of
any warrants offered pursuant to this prospectus, when issued and paid for, will also be, fully paid and non-assessable.
Preferred stock
Under our amended and restated certificate of incorporation, our board
of directors has the authority, without further action by our stockholders, to issue up to 5,000,000 shares of preferred stock in one
or more series and to fix the rights, preferences, privileges and restrictions thereof. These rights, preferences and privileges could
include dividend rights, conversion rights, voting rights, terms of redemption, liquidation preferences, sinking fund terms and the number
of shares constituting any series or the designation of such series, any or all of which may be greater than the rights of common stock.
The issuance of our preferred stock could adversely affect the voting power of holders of common stock and the likelihood that such holders
will receive dividend payments and payments upon liquidation. In addition, the issuance of preferred stock could have the effect of delaying,
deferring or preventing a change of control of our company or other corporate action.
The following summary of terms of our preferred stock is not complete.
You should refer to the provisions of our amended and restated certificate of incorporation and amended and restated bylaws and the resolutions
containing the terms of each class or series of the preferred stock which have been or will be filed with the SEC at or prior to the time
of issuance of such class or series of preferred stock and described in the applicable prospectus supplement. The applicable prospectus
supplement may also state that any of the terms set forth herein are inapplicable to such series of preferred stock, provided that the
information set forth in such prospectus supplement does not constitute material changes to the information herein such that it alters
the nature of the offering or the securities offered.
Our board of directors will fix the designations, voting powers,
preferences and rights of the preferred stock of each series we issue under this prospectus, as well as the qualifications,
limitations or restrictions thereof, in the certificate of designation relating to that series. We will file as an exhibit to the
registration statement of which this prospectus is a part, or will incorporate by reference from reports that we file with the SEC,
the form of any certificate of designation that describes the terms of the series of preferred stock we are offering. We will
describe in the applicable prospectus supplement the terms of the series of preferred stock being offered, including, to the extent
applicable:
| · | the title and stated value; |
| · | the number of shares we are offering; |
| · | the liquidation preference per share; |
| · | the dividend rate, period and payment date and method of calculation for dividends; |
| · | whether dividends will be cumulative or non-cumulative and, if cumulative, the date from which dividends will accumulate; |
| · | the procedures for any auction and remarketing; |
| · | the provisions for a sinking fund; |
| · | the provisions for redemption or repurchase and any restrictions on our ability to exercise those redemption and repurchase rights; |
| · | any listing of the preferred stock on any securities exchange or market; |
| · | whether the preferred stock will be convertible into our common stock or other securities, and the conversion rate or conversion price,
or how they will be calculated, and the conversion period; |
| · | whether the preferred stock will be exchangeable into debt securities, and the exchange rate or exchange price, or how they will be
calculated, and the exchange period; |
| · | voting rights of the preferred stock; |
| · | restrictions on transfer, sale or other assignment; |
| · | whether interests in the preferred stock will be represented by depositary shares; |
| · | a discussion of material or special U.S. federal income tax considerations applicable to the preferred stock; |
| · | the relative ranking and preferences of the preferred stock as to dividend rights and rights if we liquidate, dissolve or wind up
our affairs; |
| · | any limitations on the issuance of any class or series of preferred stock ranking senior to or on parity with the series of preferred
stock as to dividend rights and rights if we liquidate, dissolve or wind up our affairs; and |
| · | any other specific terms, preferences, rights or limitations of, or restrictions on, the preferred stock. |
If we issue shares of preferred stock under this prospectus, they will
be validly issued, fully paid and non-assessable.
The DGCL provides that the holders of preferred stock will have the
right to vote separately as a class on any proposal involving fundamental changes in the rights of holders of such preferred stock. This
right is in addition to any voting rights that may be provided for in the applicable certificate of designation.
The issuance of our preferred stock could adversely affect the voting
power, conversion or other rights of holders of common stock and reduce the likelihood that such holders will receive dividend payments
and payments upon liquidation. In addition, the issuance of preferred stock could have the effect of delaying, deferring or preventing
a change in control of our company or other corporate action. Additionally, the issuance of preferred stock may have the effect of decreasing
the market price of our common stock.
Possible Anti-Takeover Effects of Delaware Law and Our Certificate
of Incorporation and Bylaws
Provisions of the DGCL and our amended and restated certificate
of incorporation and amended and restated bylaws could make it more difficult to acquire our company by means of a tender offer, a
proxy contest or otherwise, or to remove incumbent officers and directors. These provisions, summarized below, are expected to
discourage certain types of coercive takeover practices and takeover bids that our board of directors may consider inadequate and to
encourage persons seeking to acquire control of our company to first negotiate with our board of directors. We believe that the
benefits of increased protection of our ability to negotiate with the proponent of an unfriendly or unsolicited proposal to acquire
or restructure our company outweigh the disadvantages of discouraging takeover or acquisition proposals because, among other things,
negotiation of these proposals could result in an improvement of their terms.
Classified Board
Our amended and restated certificate of incorporation and our amended
and restated bylaws provide that our board of directors is divided into three classes. The directors designated as Class I directors have
terms expiring at the annual meeting of stockholders in 2023. The directors designated as Class II directors will have terms expiring
at the annual meeting of stockholders in 2021, and the directors designated as Class III directors will have terms expiring at the annual
meeting of stockholders in 2022. Directors for each class will be elected at the annual meeting of stockholders held in the year in which
the term for that class expires and thereafter will serve for a term of three years. At any meeting of stockholders for the election of
directors at which a quorum is present, the election will be determined by a plurality of the votes cast by the stockholders entitled
to vote at the election. Under the classified board provisions, it would take at least two elections of directors for any individual or
group to gain control of our board. Accordingly, these provisions could discourage a third party from initiating a proxy contest, making
a tender offer or otherwise attempting to gain control of our company.
Removal of Directors
Our amended and restated bylaws provide that our stockholders may only
remove our directors with cause.
Amendment
Our amended and restated certificate of incorporation and our amended
and restated bylaws provide that the affirmative vote of the holders of at least 75% of our voting stock then outstanding is required
to amend certain provisions relating to the number, term, election and removal of our directors, the filling of our board vacancies, stockholder
notice procedures, the calling of special meetings of stockholders and the indemnification of directors. Further, any amendments of our
bylaws must be approved by our stockholders as our amended and restated certificate of incorporation does not authorize our board of directors
to amend our bylaws.
Size of Board and Vacancies
Our amended and restated bylaws provide that the number of directors
on our board of directors is fixed exclusively by our board of directors. Newly created directorships resulting from any increase in our
authorized number of directors will be filled by a majority of our board of directors then in office, provided that a majority of the
entire board of directors, or a quorum, is present and any vacancies in our board of directors resulting from death, resignation, retirement,
disqualification, removal from office or other cause will be filled generally by the majority vote of our remaining directors in office,
even if less than a quorum is present.
Special Stockholder Meetings
Our amended and restated certificate of incorporation provides that
only the Chairman of our board of directors, our Chief Executive Officer or our board of directors pursuant to a resolution adopted by
a majority of the total number of directors we would have if there were no vacancies may call special meetings of our stockholders.
Stockholder Action by Unanimous Written Consent
Our amended and restated certificate of incorporation expressly eliminates
the right of our stockholders to act by written consent.
Requirements for Advance Notification of Stockholder Nominations
and Proposals
Our amended and restated bylaws provide advance notice procedures with
respect to stockholder proposals and nomination of candidates for election as directors other than nominations made by or at the direction
of board of directors or a committee of our board of directors.
No Cumulative Voting
The DGCL provides that stockholders are denied the right to cumulate
votes in the election of directors unless our certificate of incorporation provides otherwise. Our amended and restated certificate of
incorporation does not provide for cumulative voting.
Undesignated Preferred Stock
The authority that is possessed by our board of directors to issue
preferred stock could potentially be used to discourage attempts by third parties to obtain control of our company through a merger, tender
offer, proxy contest, or otherwise by making it more difficult or costlier to obtain control of our company. Our board of directors may
issue preferred stock with voting rights or conversion rights that, if exercised, could adversely affect the voting power of the holders
of common stock.
Authorized but Unissued Shares
Our authorized but unissued shares of common stock and preferred stock
will be available for future issuance without stockholder approval. We may use additional shares for a variety of purposes, including
future public offerings to raise additional capital, to fund acquisitions and as employee compensation. The existence of authorized but
unissued shares of common stock and preferred stock could render more difficult or discourage an attempt to obtain control of our company
by means of a proxy contest, tender offer, merger or otherwise.
The above provisions may deter a hostile takeover or delay a change
in control or management of our company.
Listing on the Nasdaq Capital Market
Our common stock is listed on the Nasdaq Capital Market under the symbol
“SLS”. On April 15, 2021, the closing price of our common stock was $7.89 per share. As of April 13, 2021, we had approximately
17 stockholders of record.
The applicable prospectus supplement will contain information, where
applicable, as to other listing, if any, on the Nasdaq Capital Market or other securities exchange of the preferred stock covered by such
prospectus supplement.
Transfer Agent and Registrar
The transfer agent and registrar for our capital stock is Computershare
Trust Company, N.A. Its address is 250 Royall Street, Canton, MA 02021. Its telephone number is (201) 680-4503.
DESCRIPTION OF
DEBT SECURITIES
We may issue debt securities from time to time, in one or more series,
as either senior or subordinated debt or as senior or subordinated convertible debt. While the terms we have summarized below will apply
generally to any debt securities that we may offer under this prospectus, we will describe the particular terms of any debt securities
that we may offer in more detail in the applicable prospectus supplement. The terms of any debt securities offered under a prospectus
supplement may differ from the terms described below. Unless the context requires otherwise, whenever we refer to the indenture, we also
are referring to any supplemental indentures that specify the terms of a particular series of debt securities.
We will issue the debt securities under the indenture that we will
enter into with the trustee named in the indenture. The indenture will be qualified under the Trust Indenture Act of 1939, as amended,
or the Trust Indenture Act. We have filed forms of senior and subordinated indentures as exhibits to the registration statement of which
this prospectus is a part, and supplemental indentures and forms of debt securities containing the terms of the debt securities being
offered will be filed as exhibits to the registration statement of which this prospectus is a part or will be incorporated by reference
from reports that we file with the SEC.
The following summary of material provisions of the debt securities
and the indenture is subject to, and qualified in its entirety by reference to, all of the provisions of the indenture applicable to a
particular series of debt securities. We urge you to read the applicable prospectus supplements and any related free writing prospectuses
related to the debt securities that we may offer under this prospectus, as well as the complete indenture that contains the terms of the
debt securities.
General
The indenture does not limit the amount of debt securities that we
may issue. It provides that we may issue debt securities up to the principal amount that we may authorize and may be in any currency or
currency unit that we may designate. Except for the limitations on consolidation, merger and sale of all or substantially all of our assets
contained in the indenture, the terms of the indenture do not contain any covenants or other provisions designed to give holders of any
debt securities protection against changes in our operations, financial condition or transactions involving us.
We may issue the debt securities issued under the indenture as “discount
securities,” which means they may be sold at a discount below their stated principal amount. These debt securities, as well as other
debt securities that are not issued at a discount, may be issued with “original issue discount,” or OID, for U.S. federal
income tax purposes because of interest payment and other characteristics or terms of the debt securities. Material U.S. federal income
tax considerations applicable to debt securities issued with OID will be described in more detail in any applicable prospectus supplement.
We will describe in the applicable prospectus supplement the terms
of the series of debt securities being offered, including:
| · | the title of the series of debt securities; |
| · | any limit upon the aggregate principal amount that may be issued; |
| · | the maturity date or dates; |
| · | the form of the debt securities of the series; |
| · | the applicability of any guarantees; |
| · | whether or not the debt securities will be secured or unsecured, and the terms of any secured debt; |
| · | whether the debt securities rank as senior debt, senior subordinated debt, subordinated debt or any combination thereof, and the terms
of any subordination; |
| · | if the price (expressed as a percentage of the aggregate principal amount thereof) at which such debt securities will be issued is
a price other than the principal amount thereof, the portion of the principal amount thereof payable upon declaration of acceleration
of the maturity thereof, or if applicable, the portion of the principal amount of such debt securities that is convertible into another
security or the method by which any such portion shall be determined; |
| · | the interest rate or rates, which may be fixed or variable, or the method for determining the rate and the date interest will begin
to accrue, the dates interest will be payable and the regular record dates for interest payment dates or the method for determining such
dates; |
| · | our right, if any, to defer payment of interest and the maximum length of any such deferral period; |
| · | if applicable, the date or dates after which, or the period or periods during which, and the price or prices at which, we may, at
our option, redeem the series of debt securities pursuant to any optional or provisional redemption provisions and the terms of those
redemption provisions; |
| · | the date or dates, if any, on which, and the price or prices at which we are obligated, pursuant to any mandatory sinking fund or
analogous fund provisions or otherwise, to redeem, or at the holder’s option to purchase, the series of debt securities and the
currency or currency unit in which the debt securities are payable; |
| · | the denominations in which we will issue the series of debt securities, if other than denominations of $1,000 and any integral multiple
thereof; |
| · | any and all terms, if applicable, relating to any auction or remarketing of the debt securities of that series and any security for
our obligations with respect to such debt securities and any other terms which may be advisable in connection with the marketing of debt
securities of that series; |
| · | whether the debt securities of the series shall be issued in whole or in part in the form of a global security or securities; the
terms and conditions, if any, upon which such global security or securities may be exchanged in whole or in part for other individual securities;
and the depositary for such global security or securities; |
| · | if applicable, the provisions relating to conversion or exchange of any debt securities of the series and the terms and conditions
upon which such debt securities will be so convertible or exchangeable, including the conversion or exchange price, as applicable, or
how it will be calculated and may be adjusted, any mandatory or optional (at our option or the holders’ option) conversion or exchange
features, the applicable conversion or exchange period and the manner of settlement for any conversion or exchange; |
| · | if other than the full principal amount thereof, the portion of the principal amount of debt securities of the series which shall
be payable upon declaration of acceleration of the maturity thereof; |
| · | additions to or changes in the covenants applicable to the particular debt securities being issued, including, among others, the consolidation,
merger or sale covenant; |
| · | additions to or changes in the events of default with respect to the securities and any change in the right of the trustee or the
holders to declare the principal, premium, if any, and interest, if any, with respect to such securities to be due and payable; |
| · | additions to or changes in or deletions of the provisions relating to covenant defeasance and legal defeasance; |
| · | additions to or changes in the provisions relating to satisfaction and discharge of the indenture; |
| · | additions to or changes in the provisions relating to the modification of the indenture both with and without the consent of holders
of debt securities issued under the indenture; |
| · | the currency of payment of debt securities if other than U.S. dollars and the manner of determining the equivalent amount in U.S.
dollars; |
| · | whether interest will be payable in cash or additional debt securities at our or the holders’ option and the terms and conditions
upon which the election may be made; |
| · | the terms and conditions, if any, upon which we will pay amounts in addition to the stated interest, premium, if any and principal
amounts of the debt securities of the series to any holder that is not a “United States person” for federal tax purposes; |
| · | any restrictions on transfer, sale or assignment of the debt securities of the series; and |
| · | any other specific terms, preferences, rights or limitations of, or restrictions on, the debt securities, any other additions or changes
in the provisions of the indenture, and any terms that may be required by us or advisable under applicable laws or regulations. |
Conversion or Exchange Rights
We will set forth in the applicable prospectus supplement the terms
on which a series of debt securities may be convertible into or exchangeable for our common stock or our other securities. We will include
provisions as to settlement upon conversion or exchange and whether conversion or exchange is mandatory, at the option of the holder or
at our option. We may include provisions pursuant to which the number of shares of our common stock or our other securities that the holders
of the series of debt securities receive would be subject to adjustment.
Consolidation, Merger or Sale
Unless we provide otherwise in the prospectus supplement applicable
to a particular series of debt securities, the indenture will not contain any covenant that restricts our ability to merge or consolidate,
or sell, convey, transfer or otherwise dispose of our assets as an entirety or substantially as an entirety. However, any successor to
or acquirer of such assets (other than a subsidiary of ours) must assume all of our obligations under the indenture or the debt securities,
as appropriate.
Events of Default under the Indenture
Unless we provide otherwise in the prospectus supplement applicable
to a particular series of debt securities, the following are events of default under the indenture with respect to any series of debt
securities that we may issue:
| · | if we fail to pay any installment of interest on any series of debt securities, as and when the same shall become due and payable,
and such default continues for a period of 90 days; provided, however, that a valid extension of an interest payment period by us in accordance
with the terms of any indenture supplemental thereto shall not constitute a default in the payment of interest for this purpose; |
| · | if we fail to pay the principal of, or premium, if any, on any series of debt securities as and when the same shall become due and
payable whether at maturity, upon redemption, by declaration or otherwise, or in any payment required by any sinking or analogous fund
established with respect to such series; provided, however, that a valid extension of the maturity of such debt securities in accordance
with the terms of any indenture supplemental thereto shall not constitute a default in the payment of principal or premium, if any; |
| · | if we fail to observe or perform any other covenant or agreement contained in the debt securities or the indenture, other than a covenant
specifically relating to another series of debt securities, and our failure continues for 90 days after we receive written notice of such
failure, requiring the same to be remedied and stating that such is a notice of default thereunder, from the trustee or holders of at
least 25% in aggregate principal amount of the outstanding debt securities of the applicable series; and |
| · | if specified events of bankruptcy, insolvency or reorganization occur. |
If an event of default with respect to debt securities of any series
occurs and is continuing, other than an event of default specified in the last bullet point above, the trustee or the holders of at least
25% in aggregate principal amount of the outstanding debt securities of that series, by notice to us in writing, and to the trustee if
notice is given by such holders, may declare the unpaid principal of, premium, if any, and accrued interest, if any, due and payable immediately.
If an event of default specified in the last bullet point above occurs with respect to us, the principal amount of and accrued interest,
if any, of each issue of debt securities then outstanding shall be due and payable without any notice or other action on the part of the
trustee or any holder.
The holders of a majority in principal amount of the outstanding debt
securities of an affected series may waive any default or event of default with respect to the series and its consequences, except defaults
or events of default regarding payment of principal, premium, if any, or interest, unless we have cured the default or event of default
in accordance with the indenture. Any waiver shall cure the default or event of default.
Subject to the terms of the indenture, if an event of default under
an indenture shall occur and be continuing, the trustee will be under no obligation to exercise any of its rights or powers under such
indenture at the request or direction of any of the holders of the applicable series of debt securities, unless such holders have offered
the trustee reasonable indemnity. The holders of a majority in principal amount of the outstanding debt securities of any series will
have the right to direct the time, method and place of conducting any proceeding for any remedy available to the trustee, or exercising
any trust or power conferred on the trustee, with respect to the debt securities of that series, provided that:
| · | the direction so given by the holder is not in conflict with any law or the applicable indenture; and |
| · | subject to its duties under the Trust Indenture Act, the trustee need not take any action that might involve it in personal liability
or might be unduly prejudicial to the holders not involved in the proceeding. |
A holder of the debt securities of any series will have the right to
institute a proceeding under the indenture or to appoint a receiver or trustee, or to seek other remedies only if:
| · | the holder has given written notice to the trustee of a continuing event of default with respect to that series; |
| · | the holders of at least 25% in aggregate principal amount of the outstanding debt securities of that series have made written request, |
| · | such holders have offered to the trustee indemnity satisfactory to it against the costs, expenses and liabilities to be incurred by
the trustee in compliance with the request; and |
| · | the trustee does not institute the proceeding and does not receive from the holders of a majority in aggregate principal amount of
the outstanding debt securities of that series other conflicting directions within 90 days after the notice, request and offer. |
These limitations do not apply to a suit instituted by a holder of
debt securities if we default in the payment of the principal, premium, if any, or interest on, the debt securities.
We will periodically file statements with the trustee regarding our
compliance with specified covenants in the indenture.
Modification of Indenture; Waiver
We and the trustee may change an indenture without the consent of any
holders with respect to specific matters:
| · | to cure any ambiguity, defect or inconsistency in the indenture or in the debt securities of any series; |
| · | to comply with the provisions described above under “Description of Debt Securities—Consolidation, Merger or Sale;” |
| · | to provide for uncertificated debt securities in addition to or in place of certificated debt securities; |
| · | to add to our covenants, restrictions, conditions or provisions such new covenants, restrictions, conditions or provisions for the
benefit of the holders of all or any series of debt securities, to make the occurrence, or the occurrence and the continuance, of a default
in any such additional covenants, restrictions, conditions or provisions an event of default or to surrender any right or power conferred
upon us in the indenture; |
| · | to add to, delete from or revise the conditions, limitations, and restrictions on the authorized amount, terms, or purposes of issue,
authentication and delivery of debt securities, as set forth in the indenture; |
| · | to make any change that does not adversely affect the interests of any holder of debt securities of any series in any material respect; |
| · | to provide for the issuance of and establish the form and terms and conditions of the debt securities of any series as provided above
under “Description of Debt Securities—General” to establish the form of any certifications required to be furnished
pursuant to the terms of the indenture or any series of debt securities, or to add to the rights of the holders of any series of debt
securities; |
| · | to evidence and provide for the acceptance of appointment under any indenture by a successor trustee; or |
| · | to comply with any requirements of the SEC in connection with the qualification of any indenture under the Trust Indenture Act. |
In addition, under the indenture, the rights of holders of a series
of debt securities may be changed by us and the trustee with the written consent of the holders of at least a majority in aggregate principal
amount of the outstanding debt securities of each series that is affected. However, unless we provide otherwise in the prospectus supplement
applicable to a particular series of debt securities, we and the trustee may make the following changes only with the consent of each
holder of any outstanding debt securities affected:
| · | extending the fixed maturity of any debt securities of any series; |
| · | reducing the principal amount, reducing the rate of or extending the time of payment of interest, or reducing any premium payable
upon the redemption of any series of any debt securities; or |
| · | reducing the percentage of debt securities, the holders of which are required to consent to any amendment, supplement, modification
or waiver. |
Discharge
Each indenture provides that we can elect to be discharged from our
obligations with respect to one or more series of debt securities, except for specified obligations, including obligations to:
| · | register the transfer or exchange of debt securities of the series; |
| · | replace stolen, lost or mutilated debt securities of the series; |
| · | pay principal of and premium and interest on any debt securities of the series; |
| · | maintain paying agencies; |
| · | hold monies for payment in trust; |
| · | recover excess money held by the trustee; |
| · | compensate and indemnify the trustee; and |
| · | appoint any successor trustee. |
In order to exercise our rights to be discharged, we must deposit with
the trustee money or government obligations sufficient to pay all the principal of, any premium, if any, and interest on, the debt securities
of the series on the dates payments are due.
Form, Exchange and Transfer
We will issue the debt securities of each series only in fully registered
form without coupons and, unless we provide otherwise in the applicable prospectus supplement, in denominations of $1,000 and any integral
multiple thereof. The indenture provides that we may issue debt securities of a series in temporary or permanent global form and as book-entry
securities that will be deposited with, or on behalf of, The Depository Trust Company, or DTC, or another depositary named by us and identified
in the applicable prospectus supplement with respect to that series. To the extent the debt securities of a series are issued in global
form and as book-entry, a description of terms relating to any book-entry securities will be set forth in the applicable prospectus supplement.
At the option of the holder, subject to the terms of the indenture
and the limitations applicable to global securities described in the applicable prospectus supplement, the holder of the debt securities
of any series can exchange the debt securities for other debt securities of the same series, in any authorized denomination and of like
tenor and aggregate principal amount.
Subject to the terms of the indenture and the limitations applicable
to global securities set forth in the applicable prospectus supplement, holders of the debt securities may present the debt securities
for exchange or for registration of transfer, duly endorsed or with the form of transfer endorsed thereon duly executed if so required
by us or the security registrar, at the office of the security registrar or at the office of any transfer agent designated by us for this
purpose. Unless otherwise provided in the debt securities that the holder presents for transfer or exchange, we will impose no service
charge for any registration of transfer or exchange, but we may require payment of any taxes or other governmental charges.
We will name in the applicable prospectus supplement the security registrar,
and any transfer agent in addition to the security registrar, that we initially designate for any debt securities. We may at any time
designate additional transfer agents or rescind the designation of any transfer agent or approve a change in the office through which
any transfer agent acts, except that we will be required to maintain a transfer agent in each place of payment for the debt securities
of each series.
If we elect to redeem the debt securities of any series, we will not
be required to:
| · | issue, register the transfer of, or exchange any debt securities of that series during a period beginning at the opening of business
15 days before the day of mailing of a notice of redemption of any debt securities that may be selected for redemption and ending at the
close of business on the day of the mailing; or |
| · | register the transfer of or exchange any debt securities so selected for redemption, in whole or in part, except the unredeemed portion
of any debt securities we are redeeming in part. |
Information Concerning the Trustee
The trustee, other than during the occurrence and continuance of an
event of default under an indenture, undertakes to perform only those duties as are specifically set forth in the applicable indenture.
Upon an event of default under an indenture, the trustee must use the same degree of care as a prudent person would exercise or use in
the conduct of his or her own affairs. Subject to this provision, the trustee is under no obligation to exercise any of the powers given
it by the indenture at the request of any holder of debt securities unless it is offered reasonable security and indemnity against the
costs, expenses and liabilities that it might incur.
Payment and Paying Agents
Unless we otherwise indicate in the applicable prospectus supplement,
we will make payment of the interest on any debt securities on any interest payment date to the person in whose name the debt securities,
or one or more predecessor securities, are registered at the close of business on the regular record date for the interest.
We will pay principal of and any premium and interest on the debt securities
of a particular series at the office of the paying agents designated by us, except that unless we otherwise indicate in the applicable
prospectus supplement, we will make interest payments by check that we will mail to the holder or by wire transfer to certain holders.
Unless we otherwise indicate in the applicable prospectus supplement, we will designate the corporate trust office of the trustee as our
sole paying agent for payments with respect to debt securities of each series. We will name in the applicable prospectus supplement any
other paying agents that we initially designate for the debt securities of a particular series. We will maintain a paying agent in each
place of payment for the debt securities of a particular series.
All money we pay to a paying agent or the trustee for the payment of
the principal of or any premium or interest on any debt securities that remains unclaimed at the end of two years after such principal,
premium or interest has become due and payable will be repaid to us, and the holder of the debt security thereafter may look only to us
for payment thereof.
Governing Law
The indenture and the debt securities will be governed by and construed
in accordance with the internal laws of the State of New York, except to the extent that the Trust Indenture Act of 1939 is applicable.
DESCRIPTION OF
WARRANTS
The following description, together with the additional information
we may include in any applicable prospectus supplement and in any related free writing prospectus that we may authorize to be distributed
to you, summarizes the material terms and provisions of the warrants that we may offer under this prospectus, which may consist of warrants
to purchase common stock, preferred stock and/or debt securities and may be issued in one or more series. Warrants may be offered independently
or in combination with common stock, preferred stock or debt securities offered by any prospectus supplement, and may be attached to or
separate from those securities. While the terms we have summarized below will apply generally to any warrants that we may offer under
this prospectus, we will describe the particular terms of any series of warrants that we may offer in more detail in the applicable prospectus
supplement. The following description of warrants will apply to the warrants offered by this prospectus unless we provide otherwise in
the applicable prospectus supplement. The applicable prospectus supplement for a particular series of warrants may specify different or
additional terms.
We have filed forms of the warrant agreements and forms of warrant
certificates containing the terms of the warrants that may be offered as exhibits to the registration statement of which this prospectus
is a part. We will file as exhibits to the registration statement of which this prospectus is a part, or will incorporate by reference
from reports that we file with the SEC, the form of warrant and/or the warrant agreement and warrant certificate, as applicable, that
contain the terms of the particular series of warrants we are offering, and any supplemental agreements, before the issuance of such warrants.
The following summaries of material terms and provisions of the warrants are subject to, and qualified in their entirety by reference
to, all the provisions of the form of warrant and/or the warrant agreement and warrant certificate, as applicable, and any supplemental
agreements applicable to a particular series of warrants that we may offer under this prospectus. We urge you to read the applicable prospectus
supplement related to the particular series of warrants that we may offer under this prospectus, as well as any related free writing prospectus,
and the complete form of warrant and/or the warrant agreement and warrant certificate, as applicable, and any supplemental agreements,
that contain the terms of the warrants.
General
We will describe in the applicable prospectus supplement the terms
of the series of warrants being offered, including, to the extent applicable:
| · | the offering price and aggregate number of warrants offered; |
| · | the currency for which the warrants may be purchased; |
| · | the designation and terms of the securities with which the warrants are issued and the number of warrants issued with each such security
or each principal amount of such security; |
| · | the date on and after which the warrants and the related securities will be separately transferable; |
| · | in the case of warrants to purchase debt securities, the principal amount of debt securities purchasable upon exercise of one warrant
and the price at, and currency in which, this principal amount of debt securities may be purchased upon such exercise; |
| · | in the case of warrants to purchase common stock or preferred stock, the number of shares of common stock or preferred stock, as the
case may be, purchasable upon the exercise of one warrant and the price at which these shares may be purchased upon such exercise; |
| · | the amount of warrants or rights outstanding; |
| · | the effect of any merger, consolidation, sale or other disposition of our business on the warrant agreements and the warrants; |
| · | the terms of any rights to redeem or call the warrants; |
| · | the terms of any rights to force the exercise of the warrants; |
| · | any provisions for changes to or adjustments in the exercise price or number of securities issuable upon exercise of the warrants; |
| · | the dates on which the right to exercise the warrants will commence and expire; |
| · | the manner in which the warrant agreements and warrants may be modified; |
| · | a discussion of material or special U.S. federal income tax considerations of holding or exercising the warrants; |
| · | the terms of the securities issuable upon exercise of the warrants; and |
| · | any other specific terms, preferences, rights or limitations of or restrictions on the warrants. |
Before exercising their warrants, holders of warrants will not have
any of the rights of holders of the securities purchasable upon such exercise, including:
| · | in the case of warrants to purchase debt securities, the right to receive payments of principal of, or premium, if any, or interest
on, the debt securities purchasable upon exercise or to enforce covenants in the applicable indenture; or |
| · | in the case of warrants to purchase common stock or preferred stock, the right to receive dividends, if any, or, payments upon our
liquidation, dissolution or winding up or to exercise voting rights, if any. |
Exercise of Warrants
Each warrant will entitle the holder to purchase the securities that
we specify in the applicable prospectus supplement at the exercise price that we describe in the applicable prospectus supplement. The
warrants may be exercised as set forth in the prospectus supplement relating to the warrants offered. Unless we otherwise specify in the
applicable prospectus supplement, warrants may be exercised at any time up to the specified time on the expiration date that we set forth
in the applicable prospectus supplement. After the close of business on the expiration date, unexercised warrants will become void.
Unless we otherwise specify in the applicable prospectus supplement,
holders of the warrants may exercise the warrants by delivering the warrant or warrant certificate, as applicable, representing the warrants
to be exercised together with specified information, and paying the required amount to the warrant agent in immediately available funds,
as provided in the applicable prospectus supplement. We will set forth in the applicable warrant or warrant certificate and in the applicable
prospectus supplement the information that the holder of the warrant will be required to deliver to the warrant agent in connection with
the exercise of the warrant.
Upon receipt of the required payment and the warrant or warrant certificate,
as applicable, properly completed and duly executed at the corporate trust office of the warrant agent, if any, or any other office, including
ours, indicated in the prospectus supplement, we will, as soon as practicable, issue and deliver the securities purchasable upon such
exercise. If less than all of the warrants (or the warrants represented by such warrant certificate) are exercised, a new warrant or a
new warrant certificate, as applicable, will be issued for the remaining warrants. If we so indicate in the applicable prospectus supplement,
holders of the warrants may surrender securities as all or part of the exercise price for warrants.
Governing Law
Unless we provide otherwise in the applicable prospectus supplement,
the warrants, warrant agreements, and any claim, controversy or dispute arising under or related to the warrants or warrant agreements
will be governed by and construed in accordance with the laws of the State of New York.
Enforceability of Rights by Holders of Warrants
Each warrant agent, if any, will act solely as our agent under the
applicable warrant agreement and will not assume any obligation or relationship of agency or trust with any holder of any warrant. A single
bank or trust company may act as warrant agent for more than one issue of warrants. A warrant agent will have no duty or responsibility
in case of any default by us under the applicable warrant agreement or warrant, including any duty or responsibility to initiate any proceedings
at law or otherwise, or to make any demand upon us. Any holder of a warrant may, without the consent of the related warrant agent or the
holder of any other warrant, enforce by appropriate legal action its right to exercise, and receive the securities purchasable upon exercise
of, its warrants.
Outstanding Warrants
Certain of our outstanding warrants contain customary net exercise
provisions and provisions for the adjustment of the exercise price and the number of shares issuable upon the exercise of the warrant
in the event of certain stock dividends, stock splits, recapitalizations, reclassifications, consolidations and other fundamental transactions.
DESCRIPTION OF
RIGHTS
General
We may issue rights to our stockholders to purchase shares of our common
stock, preferred stock or the other securities described in this prospectus. We may offer rights separately or together with one or more
additional rights, debt securities, preferred stock, common stock, warrants or any combination of those securities in the form of units,
as described in the applicable prospectus supplement. Each series of rights will be issued under a separate rights agreement to be entered
into between us and a bank or trust company, as rights agent. The rights agent will act solely as our agent in connection with the certificates
relating to the rights of the series of certificates and will not assume any obligation or relationship of agency or trust for or with
any holders of rights certificates or beneficial owners of rights. The following description sets forth certain general terms and provisions
of the rights to which any prospectus supplement may relate. The particular terms of the rights to which any prospectus supplement may
relate and the extent, if any, to which the general provisions may apply to the rights so offered will be described in the applicable
prospectus supplement. To the extent that any particular terms of the rights, rights agreement or rights certificates described in a prospectus
supplement differ from any of the terms described below, then the terms described below will be deemed to have been superseded by that
prospectus supplement. We encourage you to read the applicable rights agreement and rights certificate for additional information before
you decide whether to purchase any of our rights. We will provide in a prospectus supplement the following terms of the rights being issued:
| · | the date of determining the stockholders entitled to the rights distribution; |
| · | the aggregate number of shares of common stock, preferred stock or other securities purchasable upon exercise of the rights; |
| · | the aggregate number of rights issued; |
| · | whether the rights are transferrable and the date, if any, on and after which the rights may be separately transferred; |
| · | the date on which the right to exercise the rights will commence, and the date on which the right to exercise the rights will expire; |
| · | the method by which holders of rights will be entitled to exercise; |
| · | the conditions to the completion of the offering, if any; |
| · | the withdrawal, termination and cancellation rights, if any; |
| · | whether there are any backstop or standby purchaser or purchasers and the terms of their commitment, if any; |
| · | whether stockholders are entitled to oversubscription rights, if any; |
| · | any applicable material U.S. federal income tax considerations; and |
| · | any other terms of the rights, including terms, procedures and limitations relating to the distribution, exchange and exercise of
the rights, as applicable. |
Each right will entitle the holder of rights
to purchase for cash the principal amount of shares of common stock, preferred stock or other securities at the exercise price provided
in the applicable prospectus supplement. Rights may be exercised at any time up to the close of business on the expiration date for the
rights provided in the applicable prospectus supplement.
Holders may exercise rights as described in the applicable prospectus
supplement. Upon receipt of payment and the rights certificate properly completed and duly executed at the corporate trust office of the
rights agent or any other office indicated in the prospectus supplement, we will, as soon as practicable, forward the shares of common
stock, preferred stock or other securities, as applicable, purchasable upon exercise of the rights. If less than all of the rights issued
in any rights offering are exercised, we may offer any unsubscribed securities directly to persons other than stockholders, to or through
agents, underwriters or dealers or through a combination of such methods, including pursuant to standby arrangements, as described in
the applicable prospectus supplement.
Rights Agent
The rights agent for any rights we offer will be set forth in the applicable
prospectus supplement.
DESCRIPTION OF
UNITS
The following description, together with the additional information
that we include in any applicable prospectus supplement and in any free writing prospectus that we may authorize to be distributed to
you, summarizes the material terms and provisions of the units that we may offer under this prospectus. While the terms we have summarized
below will apply generally to any units that we may offer under this prospectus, we will describe the particular terms of any series of
units in more detail in the applicable prospectus supplement. The terms of any units offered under a prospectus supplement may differ
from the terms described below.
We will incorporate by reference from reports that we file with the
SEC, the form of unit agreement that describes the terms of the series of units we are offering, and any supplemental agreements, before
the issuance of the related series of units. The following summaries of material terms and provisions of the units are subject to, and
qualified in their entirety by reference to, all the provisions of the unit agreement and any supplemental agreements applicable to a
particular series of units. We urge you to read the applicable prospectus supplements related to the particular series of units that we
may offer under this prospectus, as well as any related free writing prospectuses and the complete unit agreement and any supplemental
agreements that contain the terms of the units.
General
We may issue units consisting of common stock, preferred stock, one
or more debt securities, warrants or rights for the purchase of common stock, preferred stock and/or debt securities in one or more series
in any combination. Each unit will be issued so that the holder of the unit is also the holder of each security included in the unit.
Thus, the holder of a unit will have the rights and obligations of a holder of each security included in the unit. The unit agreement
under which a unit is issued may provide that the securities included in the unit may not be held or transferred separately, at any time
or at any time before a specified date.
We will describe in the applicable prospectus supplement the terms
of the series of units being offered, including:
| · | the designation and terms of the units and of the securities comprising the units, including whether and under what circumstances
those securities may be held or transferred separately; |
| · | any provisions of the governing unit agreement that differ from those described below; and |
| · | any provisions for the issuance, payment, settlement, transfer or exchange of the units or of the securities comprising the units. |
The provisions described in this section, as well as those set forth
in any prospectus supplement or as described under “Description of Common Stock,” “Description of Preferred Stock,”
“Description of Debt Securities,” “Description of Warrants” and “Description of Rights” will apply
to each unit, as applicable, and to any common stock, preferred stock, debt security, warrant or right included in each unit, as applicable.
Unit Agent
The name and address of the unit agent, if any, for any units we offer
will be set forth in the applicable prospectus supplement.
Issuance in Series
We may issue units in such amounts and in such numerous distinct series
as we determine.
Enforceability of Rights by Holders of Units
Each unit agent will act solely as our agent under the applicable unit
agreement and will not assume any obligation or relationship of agency or trust with any holder of any unit. A single bank or trust company
may act as unit agent for more than one series of units. A unit agent will have no duty or responsibility in case of any default by us
under the applicable unit agreement or unit, including any duty or responsibility to initiate any proceedings at law or otherwise, or
to make any demand upon us. Any holder of a unit may, without the consent of the related unit agent or the holder of any other unit, enforce
by appropriate legal action its rights as holder under any security included in the unit.
LEGAL OWNERSHIP
OF SECURITIES
We can issue securities in registered form or in the form of one or
more global securities. We describe global securities in greater detail below. We refer to those persons who have securities registered
in their own names on the books that we or any applicable trustee, depositary or warrant agent maintain for this purpose as the “holders”
of those securities. These persons are the legal holders of the securities. We refer to those persons who, indirectly through others,
own beneficial interests in securities that are not registered in their own names, as “indirect holders” of those securities.
As we discuss below, indirect holders are not legal holders, and investors in securities issued in book-entry form or in street name will
be indirect holders.
Book-Entry Holders
We may issue securities in book-entry form only, as we will specify
in the applicable prospectus supplement. This means securities may be represented by one or more global securities registered in the name
of a financial institution that holds them as depositary on behalf of other financial institutions that participate in the depositary’s
book-entry system. These participating institutions, which are referred to as participants, in turn, hold beneficial interests in the
securities on behalf of themselves or their customers.
Only the person in whose name a security is registered is recognized
as the holder of that security. Securities issued in global form will be registered in the name of the depositary or its participants.
Consequently, for securities issued in global form, we will recognize only the depositary as the holder of the securities, and we will
make all payments on the securities to the depositary. The depositary passes along the payments it receives to its participants, which
in turn pass the payments along to their customers who are the beneficial owners. The depositary and its participants do so under agreements
they have made with one another or with their customers; they are not obligated to do so under the terms of the securities.
As a result, investors in a global security will not own securities
directly. Instead, they will own beneficial interests in a global security, through a bank, broker or other financial institution that
participates in the depositary’s book-entry system or holds an interest through a participant. As long as the securities are issued
in global form, investors will be indirect holders, and not legal holders, of the securities.
Street Name Holders
We may terminate a global security or issue securities in
non-global form. In these cases, investors may choose to hold their securities in their own names or in “street name.”
Securities held by an investor in street name would be registered in the name of a bank, broker or other financial institution that
the investor chooses, and the investor would hold only a beneficial interest in those securities through an account he or she
maintains at that institution.
For securities held in street name, we or any applicable trustee or
depositary will recognize only the intermediary banks, brokers and other financial institutions in whose names the securities are registered
as the holders of those securities, and we or any applicable trustee or depositary will make all payments on those securities to them.
These institutions pass along the payments they receive to their customers who are the beneficial owners, but only because they agree
to do so in their customer agreements or because they are legally required to do so. Investors who hold securities in street name will
be indirect holders, not holders, of those securities.
Legal Holders
Our obligations, as well as the obligations of any applicable trustee
and of any third parties employed by us or a trustee, run only to the legal holders of the securities. We do not have obligations to investors
who hold beneficial interests in global securities, in street name or by any other indirect means. This will be the case whether an investor
chooses to be an indirect holder of a security or has no choice because we are issuing the securities only in global form.
For example, once we make a payment or give a notice to the legal holder,
we have no further responsibility for the payment or notice even if that legal holder is required, under agreements with its participants
or customers or by law, to pass it along to the indirect holders but does not do so. Similarly, we may want to obtain the approval of
the legal holders to amend an indenture, to relieve us of the consequences of a default or of our obligation to comply with a particular
provision of the indenture or for other purposes. In such an event, we would seek approval only from the legal holders, and not the indirect
holders, of the securities. Whether and how the legal holders contact the indirect holders is up to the legal holders.
Special Considerations for Indirect Holders
If you hold securities through a bank, broker or other financial institution,
either in book-entry form or in street name, you should check with your own institution to find out:
| · | how it handles securities payments and notices; |
| · | whether it imposes fees or charges; |
| · | how it would handle a request for the holders’ consent, if ever required; |
| · | whether and how you can instruct it to send you securities registered in your own name so you can be a holder, if that is permitted
in the future; |
| · | how it would exercise rights under the securities if there were a default or other event triggering the need for holders to act to
protect their interests; and |
| · | if the securities are in book-entry form, how the depositary’s rules and procedures will affect these matters. |
Global Securities
A global security is a security that represents one or any other number
of individual securities held by a depositary. Generally, all securities represented by the same global securities will have the same
terms.
Each security issued in book-entry form will be represented by a global
security that we issue to, deposit with and register in the name of a financial institution or its nominee that we select. The financial
institution that we select for this purpose is called the depositary. Unless we specify otherwise in the applicable prospectus supplement,
DTC will be the depositary for all securities issued in book-entry form.
A global security may not be transferred to or registered in the
name of anyone other than the depositary, its nominee or a successor depositary, unless special termination situations arise. We
describe those situations below under “Special Situations When a Global Security Will Be Terminated.” As a result of
these arrangements, the depositary, or its nominee, will be the sole registered owner and legal holder of all securities represented
by a global security, and investors will be permitted to own only beneficial interests in a global security. Beneficial interests
must be held by means of an account with a broker, bank or other financial institution that in turn has an account with the
depositary or with another institution that does. Thus, an investor whose security is represented by a global security will not be a
legal holder of the security, but only an indirect holder of a beneficial interest in the global security.
If the prospectus supplement for a particular security indicates that
the security will be issued in global form only, then the security will be represented by a global security at all times unless and until
the global security is terminated. If termination occurs, we may issue the securities through another book-entry clearing system or decide
that the securities may no longer be held through any book-entry clearing system.
Special Considerations for Global Securities
The rights of an indirect holder relating to a global security will
be governed by the account rules of the investor’s financial institution and of the depositary, as well as general laws relating
to securities transfers. We do not recognize an indirect holder as a holder of securities and instead deal only with the depositary that
holds the global security.
If securities are issued only in the form of a global security, an
investor should be aware of the following:
| · | an investor cannot cause the securities to be registered in his or her name, and cannot obtain non-global certificates for his or
her interest in the securities, except in the special situations we describe below; |
| · | an investor will be an indirect holder and must look to his or her own bank, broker or other financial institution for payments on
the securities and protection of his or her legal rights relating to the securities, as we describe above; |
| · | an investor may not be able to sell interests in the securities to some insurance companies and to other institutions that are required
by law to own their securities in non-book-entry form; |
| · | an investor may not be able to pledge his or her interest in a global security in circumstances where certificates representing the
securities must be delivered to the lender or other beneficiary of the pledge in order for the pledge to be effective; |
| · | the depositary’s policies, which may change from time to time, will govern payments, transfers, exchanges and other matters
relating to an investor’s interest in a global security; |
| · | we and any applicable trustee have no responsibility for any aspect of the depositary’s actions or for its records of ownership
interests in a global security, nor do we or any applicable trustee supervise the depositary in any way; |
| · | the depositary may, and we understand that DTC will, require that those who purchase and sell interests in a global security within
its book-entry system use immediately available funds, and your bank, broker or other financial institution may require you to do so as
well; and |
| · | financial institutions that participate in the depositary’s book-entry system, and through which an investor holds its interest
in a global security, may also have their own policies affecting payments, notices and other matters relating to the securities. |
| · | There may be more than one financial intermediary in the chain of ownership for an investor. We do not monitor and are not responsible
for the actions of any of those intermediaries. |
Special Situations When a Global Security Will Be Terminated
In a few special situations described below, the global security will
terminate and interests in it will be exchanged for physical certificates representing those interests. After that exchange, the choice
of whether to hold securities directly or in street name will be up to the investor. Investors must consult their own banks, brokers or
other financial institutions to find out how to have their interests in securities transferred to their own name, so that they will be
direct holders. We have described the rights of holders and street name investors above.
Unless we provide otherwise in the applicable prospectus supplement,
the global security will terminate when the following special situations occur:
| · | if the depositary notifies us that it is unwilling, unable or no longer qualified to continue as depositary for that global security
and we do not appoint another institution to act as depositary within 90 days; |
| · | if we notify any applicable trustee that we wish to terminate that global security; or |
| · | if an event of default has occurred with regard to securities represented by that global security and has not been cured or waived. |
The applicable prospectus supplement may also list additional situations
for terminating a global security that would apply only to the particular series of securities covered by the applicable prospectus supplement.
When a global security terminates, the depositary, and not we or any applicable trustee, is responsible for deciding the names of the
institutions that will be the initial direct holders.
PLAN OF DISTRIBUTION
We may sell our securities from time to time:
| · | to or through underwriters; |
| · | directly to one or more purchasers; |
| · | ordinary brokerage transactions and transactions in which the broker-dealer solicits purchasers; |
| · | block trades in which the broker-dealer will attempt to sell the shares as agent but may position and resell a portion of the block
as principal to facilitate the transaction; |
| · | purchases by a broker-dealer as principal and resale by the broker-dealer for its account; |
| · | an exchange distribution in accordance with the rules of the applicable exchange; or |
| · | through a combination of any of these methods or any other method permitted by law. |
We may directly solicit offers to purchase securities, or agents may
be designated to solicit such offers. In any applicable prospectus supplement relating to such offering, we will name any agent that could
be viewed as an underwriter under the Securities Act and describe any commissions that we must pay to any such agent. Any such agent will
be acting on a best efforts basis for the period of its appointment or, if indicated in the applicable prospectus supplement, on a firm
commitment basis. This prospectus may be used in connection with any offering of our securities through any of these methods or other
methods described in the applicable prospectus supplement.
The distribution of our securities may be effected from time to time
in one or more transactions:
| · | at a fixed price, or prices, which may be changed from time to time; |
| · | at market prices prevailing at the time of sale; |
| · | at prices related to such prevailing market prices; or |
Each prospectus supplement will describe the method of distribution
of the securities and any applicable restrictions.
A prospectus supplement or supplements (and any related free writing
prospectus that we may authorize to be provided to you with respect to a particular offering) will describe the terms of the offering
of our securities, including the following:
| · | the name or names of the agent or any underwriters; |
| · | the public offering or purchase price of the securities or other consideration therefor, and the proceeds, if any, we will receive
from the sale; |
| · | any over-allotment options under which underwriters may purchase additional securities from us; |
| · | any agency fees or underwriting discounts and commissions to be allowed or paid to the agent or underwriters; |
| · | all other items constituting underwriting compensation; |
| · | any discounts and commissions to be allowed or paid to dealers; and |
| · | any securities exchange or market on which the securities will be listed. |
If any underwriters or agents are used in the sale of our securities
in respect of which this prospectus is delivered, we will enter into an underwriting agreement, sales agreement or other agreement with
them at the time of sale to them, and we will set forth in the applicable prospectus supplement relating to such offering the names of
the underwriters or agents and the terms of the related agreement with them.
In connection with the offering of securities, we may grant to the
underwriters an option to purchase additional securities with an additional underwriting commission, as may be set forth in the applicable
prospectus supplement.
If a dealer is used in the sale of the securities in respect of which
the prospectus is delivered, we will sell such securities to the dealer, as principal. The dealer, who may be deemed to be an “underwriter”
as that term is defined in the Securities Act, may then resell such securities to the public at varying prices to be determined by such
dealer at the time of resale.
We may provide agents and underwriters with indemnification against
civil liabilities, including liabilities under the Securities Act, or contribution with respect to payments that the agents or underwriters
may make with respect to those liabilities.
If so indicated in the applicable prospectus supplement, we will authorize
underwriters or other persons acting as agents to solicit offers by certain institutions to purchase securities from us pursuant to delayed
delivery contracts providing for payment and delivery on the date stated in the applicable prospectus supplement. Each contract will be
for an amount not less than, and the aggregate amount of securities sold pursuant to such contracts shall not be less nor more than, the
respective amounts stated in the applicable prospectus supplement. Institutions with whom the contracts, when authorized, may be made
include commercial and savings banks, insurance companies, pension funds, investment companies, educational and charitable institutions
and other institutions. Delayed delivery contracts will not be subject to any conditions except that:
| · | the purchase by an institution of the securities covered under that contract shall not at the time of delivery be prohibited under
the laws of the jurisdiction to which that institution is subject; and |
| · | if the securities are also being sold to underwriters acting as principals for their own account, the underwriters shall have purchased
such securities not sold for delayed delivery. |
Offered securities may also be offered and sold, if so indicated in
the applicable prospectus supplement, in connection with a remarketing upon their purchase, in accordance with a redemption or repayment
pursuant to their terms, or otherwise, by one or more remarketing firms, acting as principals for their own accounts or as agents for
us. Any remarketing firm will be identified and the terms of its agreement, if any, with us and its compensation will be described in
the applicable prospectus supplement. Remarketing firms may be deemed to be underwriters in connection with their remarketing of offered
securities.
Certain agents, underwriters and dealers, and their associates and
affiliates, may be customers of, have borrowing relationships with, engage in other transactions with, or perform services, including
investment banking services, for us or one or more of our respective affiliates in the ordinary course of business for which they receive
compensation.
In order to facilitate the offering of our securities, any underwriters
may engage in transactions that stabilize, maintain or otherwise affect the price of the securities or any other securities the prices
of which may be used to determine payments on such securities. Specifically, any underwriters may overallot in connection with the offering,
creating a short position for their own accounts. In addition, to cover overallotments or to stabilize the price of the securities or
of any such other securities, the underwriters may bid for, and purchase, the securities or any such other securities in the open market.
Finally, in any offering of our securities through a syndicate of underwriters, the underwriting syndicate may reclaim selling concessions
allowed to an underwriter or a dealer for distributing the securities in the offering if the syndicate repurchases previously distributed
securities in transactions to cover syndicate short positions, in stabilization transactions or otherwise. Any of these activities may
stabilize or maintain the market price of the securities above independent market levels. Any such underwriters are not required to engage
in these activities and may end any of these activities at any time.
We may engage in at the market offerings into an existing trading
market in accordance with Rule 415(a)(4) under the Securities Act. In addition, we may enter into derivative transactions with third
parties, or sell securities not covered by this prospectus to third parties in privately negotiated transactions. If the applicable
prospectus supplement so indicates, in connection with those derivatives, the third parties may sell securities covered by this
prospectus and the applicable prospectus supplement, including in short sale transactions. If so, the third party may use securities
pledged by us or borrowed from us or others to settle those sales or to close out any related open borrowings of stock, and may use
securities received in settlement of those derivatives to close out any related open borrowings of stock. The third party in such
sale transactions will be an underwriter and, if not identified in this prospectus, will be named in the applicable prospectus
supplement (or a post-effective amendment). In addition, we may otherwise loan or pledge securities to a financial institution or
other third party that in turn may sell the securities short using this prospectus and an applicable prospectus supplement. Such
financial institution or other third party may transfer its economic short position to investors in our securities or in connection
with a concurrent offering of other securities.
Under Rule 15c6-1 of the Exchange Act, trades in the secondary market
generally are required to settle in two business days, unless the parties to any such trade expressly agree otherwise. The applicable
prospectus supplement may provide that the original issue date for your securities may be more than two scheduled business days after
the trade date for your securities. Accordingly, in such a case, if you wish to trade securities on any date prior to the second business
day before the original issue date for your securities, you will be required, by virtue of the fact that your securities initially are
expected to settle in more than two scheduled business days after the trade date for your securities, to make alternative settlement arrangements
to prevent a failed settlement.
The specific terms of any lock-up provisions in respect of any given
offering will be described in the applicable prospectus supplement. The anticipated date of delivery of offered securities will be set
forth in the applicable prospectus supplement relating to each offer.
LEGAL MATTERS
Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C., New York, New
York, will pass upon the validity of the securities offered hereby unless otherwise indicated in the applicable prospectus supplement.
Any underwriters will also be advised about the validity of the securities and other legal matters by their own counsel, which will be
named in the applicable prospectus supplement.
EXPERTS
Our consolidated financial statements appearing in our Annual Report
on Form 10-K for the year ended December 31, 2020, have been audited by Moss Adams LLP, an independent registered public accounting firm,
as stated in their report, which is incorporated herein by reference. Such consolidated financial statements have been so incorporated
in reliance upon the report of such firm given upon their authority as experts in auditing and accounting.
WHERE YOU CAN FIND
MORE INFORMATION
We are a reporting company and file annual, quarterly and current reports,
proxy statements and other information with the SEC. This prospectus is part of the registration statement on Form S-3 we filed with the
SEC under the Securities Act and does not contain all the information set forth or incorporated by reference in the registration statement.
Whenever a reference is made in this prospectus to any of our contracts, agreements or other documents, the reference may not be complete
and you should refer to the exhibits that are a part of the registration statement or the exhibits to the reports or other documents incorporated
by reference into this prospectus for a copy of such contract, agreement or other document. You may read and copy the registration statement,
as well as our reports, proxy statements and other information, at the SEC’s Public Reference Room at 100 F Street, N.E., Washington,
D.C. 20549. Please call the SEC at 1-800-SEC-0330 for more information about the operation of the public reference room. The SEC also
maintains an Internet site that contains reports, proxy and information statements and other information regarding issuers that file electronically
with the SEC, including SELLAS Life Sciences Group, Inc. The SEC’s Internet site can be found at www.sec.gov. We maintain a website
at www.sellaslife.com. Information found on, or accessible through, our website is not a part of, and is not incorporated into, this prospectus,
or any prospectus supplement, and you should not consider it part of this prospectus or any prospectus supplement.
INCORPORATION BY
REFERENCE
The SEC allows us to incorporate by reference the information we file
with it, which means that we can disclose important information to you by referring you to another document that we have filed separately
with the SEC. You should read the information incorporated by reference because it is an important part of this prospectus and the applicable
prospectus supplement. Information in this prospectus supersedes information incorporated by reference that we filed with the SEC prior
to the date of this prospectus, while information that we file later with the SEC will automatically update and supersede the information
in this prospectus and the applicable prospectus supplement. We incorporate by reference into this prospectus and the registration statement
of which this prospectus is a part the information or documents listed below that we have filed with the SEC (Commission File No. 001-33958):
We also incorporate by reference any future filings (other than the
portions of current reports furnished under Item 2.02 or Item 7.01 of Form 8-K and exhibits filed on such form that are related to such
items unless such Form 8-K expressly provides to the contrary) made with the SEC pursuant to Sections 13(a), 13(c), 14 or 15(d) of the
Exchange Act, including those made after the date of the initial filing of the registration statement of which this prospectus is a part
and prior to effectiveness of such registration statement, until we file a post-effective amendment that indicates the termination of
the offering of the common stock made by this prospectus and will become a part of this prospectus from the date that such documents are
filed with the SEC. Information in such future filings updates and supplements the information provided in this prospectus and any applicable
prospectus supplement. Any statements in any such future filings will automatically be deemed to modify and supersede any information
in any document we previously filed with the SEC that is incorporated or deemed to be incorporated herein by reference to the extent that
statements in the later filed document modify or replace such earlier statements.
We will furnish without charge to each person, including any beneficial
owner, to whom a prospectus and applicable prospectus supplement is delivered, upon written or oral request, a copy of any or all of the
documents incorporated by reference into this prospectus but not delivered with the prospectus and applicable prospectus supplement, including
exhibits that are specifically incorporated by reference into such documents. You should direct any requests for documents to SELLAS Life
Sciences Group, Inc., Attention: Corporate Secretary, 7 Times Square, Suite 2503, New York, NY 10036. Our phone number is (646) 200-5278.
10,130,000 Shares
Pre-Funded Warrants to Purchase up to
1,870,000 Shares
Warrants to Purchase up to 12,000,000
Shares
Common Stock
Sole Placement Agent
A.G.P.
January 4, 2024
SELLAS Life Sciences (NASDAQ:SLS)
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From Jan 2024 to Jan 2025