Filed Pursuant to Rule 424(b)(5)

Registration No. 333-229499

Registration No. 333-252937

PROSPECTUS SUPPLEMENT

(To Prospectus dated February 12, 2019)

9,230,770 Shares

Common Stock

 

We are offering shares of our common stock. Our common stock is listed on the Nasdaq Global Market under the symbol “ACET.” On February 9, 2021, the last reported sale price of our common stock was $13.69 per share.

We are an “emerging growth company” as defined by the Jumpstart Our Business Startups Act of 2012 and, as such, we have elected to comply with certain reduced public company reporting requirements for this prospectus supplement, the accompanying prospectus and future filings.

 

Investing in our common stock involves a high degree of risk. Please read Risk Factors beginning on page S-13 of this prospectus supplement and in the documents 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 accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

 

 

 

 

Per Share 

 

Total 

Public offering price

 

$        13.00

 

$     120,000,010

Underwriting discounts and commissions (1)

 

$          0.78

 

$         7,200,001

Proceeds to Adicet Bio, Inc. before expenses

 

$        12.22

 

$     112,800,009

 

 

(1)

We have agreed to reimburse the underwriters for certain expenses. See “Underwriting.”

Entities affiliated with Abingworth Bioventures 8 L.P. and entities associated with Consonance Capital Management have indicated an interest in purchasing an aggregate of approximately $45 million in shares of our common stock in this offering at the public offering price. However, because indications of interest are not binding agreements or commitments to purchase, the underwriters could determine to sell more, fewer or no shares to any of these potential purchasers, and any of these potential purchasers could determine to purchase more, fewer or no shares in this offering. The underwriters will receive the same underwriting discounts and commissions on any shares purchased by these parties as they will on any other shares sold to the public in this offering.

Certain of our existing investors, including entities affiliated with OrbiMed, have agreed to purchase from us, in connection with this offering in a private placement, $15.0 million of shares of our common stock at a price per share equal to the public offering price. The consummation of the private placement will be contingent upon the closing of this offering. However, the consummation of this offering is not contingent on the consummation of the concurrent private placement.

We have granted the underwriters an option for a period of 30 days to purchase up to an additional 1,344,743 shares of our common stock at the public offering price, less the underwriting discount. Delivery of the shares of common stock is expected to be made on or about February 12, 2021.

        

Sole Booking-Running Manager

Guggenheim Securities

 

Co-Manager

Canaccord Genuity           Wedbush PacGrow             JMP Securities

 

The date of this prospectus supplement is February 10, 2021.

 

 

 


 

 

TABLE OF CONTENTS

 

 

Page

 

PROSPECTUS SUPPLEMENT

 

 

 

ABOUT THIS PROSPECTUS SUPPLEMENT

S-3

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

S-4

PROSPECTUS SUPPLEMENT SUMMARY

S-6

RISK FACTORS

S-13

USE OF PROCEEDS

S-18

DIVIDEND POLICY

S-19

DILUTION

S-20

UNDERWRITING

S-27

CONCURRENT PRIVATE PLACEMENT

S-32

LEGAL MATTERS

S-32

EXPERTS

S-32

WHERE YOU CAN FIND ADDITIONAL INFORMATION

S-33

INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

S-34

 

 

PROSPECTUS

 

 

 

ABOUT THIS PROSPECTUS

1

RISK FACTORS

2

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

3

THE COMPANY

5

USE OF PROCEEDS

8

SECURITIES WE MAY OFFER OR THAT A SELLING STOCKHOLDER MAY OFFER

8

DESCRIPTION OF CAPITAL STOCK

9

DESCRIPTION OF DEBT SECURITIES

13

DESCRIPTION OF WARRANTS

27

DESCRIPTION OF UNITS

28

SELLING STOCKHOLDERS

31

PLAN OF DISTRIBUTION

33

LEGAL MATTERS

36

EXPERTS

36

WHERE YOU CAN FIND MORE INFORMATION

36

INCORPORATION BY REFERENCE

36

 

 

 


 

 

ABOUT THIS PROSPECTUS SUPPLEMENT

This document is part of the registration statement that we filed with the Securities and Exchange Commission, or the SEC, using a “shelf” registration process and consists of two parts. The first part is this prospectus supplement, including the documents incorporated by reference, which describes the specific terms of this offering. The second part, the accompanying prospectus dated February 12, 2019, included in our registration statement on Form S-3 (File No. 333-229499) including the documents incorporated by reference, gives more general information, some of which may not apply to this offering. Generally, when we refer to the “prospectus,” we are referring to both parts combined. This prospectus supplement and any related free writing prospectus we authorize for use in connection with this offering may add to, update or change information in the accompanying prospectus and the documents incorporated by reference into this prospectus supplement or the accompanying prospectus.

If information in this prospectus supplement is inconsistent with the accompanying prospectus or with any document incorporated by reference that was filed with the SEC before the date of this prospectus supplement, you should rely on this prospectus supplement. This prospectus supplement, the accompanying prospectus, the documents incorporated by reference into each and any free writing prospectus we authorize for use in connection with this offering include important information about us, the common stock and other information should you consider before investing in the common stock. See “Incorporation of Certain Information by Reference.”

We further note that the representations, warranties and covenants made by us in any agreement that is filed as an exhibit to any document that is incorporated by reference herein were made solely for the benefit of the parties to such agreement, including, in some cases, for the purpose of allocating risk among the parties to such agreements, and should not be deemed to be a representation, warranty or covenant to you. Moreover, such representations, warranties and covenants were accurate only as of the date when made. Accordingly, such representations, warranties and covenants should not be relied on as accurately representing the current state of our affairs.

We take no responsibility for, and can provide no assurances as to the reliability of, any information that is in addition to or different from that contained or incorporated by reference in this prospectus supplement and the accompanying prospectus. We are not offering to sell these securities in any jurisdiction where the offer or sale is not permitted. You should not assume that the information contained or incorporated by reference in this prospectus supplement or the accompanying prospectus is accurate as of any date other than as of the date of this prospectus supplement or the accompanying prospectus, as the case may be, or in the case of the documents incorporated by reference, the date of such documents regardless of the time of delivery of this prospectus supplement and the accompanying prospectus or any sale of our securities. Our business, financial condition, liquidity, results of operations and prospects may have changed since those dates.

Unless the context otherwise requires, references in this prospectus supplement to “Adicet,” the “Company,” the “combined company” “we,” “our” or “us” refer to Adicet Bio, Inc. (formerly known as resTORbio, Inc.) and its subsidiaries; references to “Adicet” refer to the Company following the completion of the Merger (defined below); references to “resTORbio” refer to the Company prior to the completion of the Merger; references to “Former Adicet” refer to Adicet Bio, Inc., a privately held corporation prior to the completion of the Merger; and references to “Adicet Sub” refer to Adicet Therapeutics, Inc., the Company’s wholly owned subsidiary following the Merger. See “Prospectus Supplement Summary—Company Information.”

We use various trademarks and trade names in our business, including without limitation our corporate name and logo. This prospectus supplement, the accompanying prospectus and the information incorporated herein and therein by reference contain references to trademarks, service marks and trade names owned by us or other companies. Solely for convenience, trademarks, service marks and trade names referred to in this prospectus supplement, the accompanying prospectus and the information incorporated herein and therein, including logos, artwork, and other visual displays, may appear without the ® or symbols, but such references are not intended to indicate, in any way, that we will not assert, to the fullest extent under applicable law, our rights or the rights of the applicable licensor to these trademarks, service marks and trade names. We do not intend our use or display of other companies’ trade names, service marks or trademarks to imply a relationship with, or endorsement or sponsorship of us by, any other companies. All trademarks, service marks and trade names included or incorporated by reference into this prospectus supplement, the accompanying prospectus or any related free writing prospectus are the property of their respective owners.

S-3


 

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

This prospectus supplement, the accompanying prospectus and the information incorporated by reference herein and therein contain and any free writing prospects we authorize for use in connection with this offering may 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 Securities Exchange Act of 1934, as amended, or the Exchange Act. Any statements about our expectations, plans, objectives, assumptions or future events or performance are not historical facts and may be forward-looking. These statements are often, but are not always, made through the use of words or phrases such as “may,” “will,” “could,” “should,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “projects,” “potential,” “continue,” and similar expressions, or the negative of these terms, or similar expressions. Accordingly, these statements involve estimates, assumptions, risks and uncertainties which could cause actual results to differ materially from those expressed in them. We believe that it is important to communicate our future expectations to our investors. However, there may be events in the future that we are not able to accurately predict or control and that may cause our actual results to differ materially from the expectations we describe in our forward-looking statements.

This prospectus supplement, the accompanying prospectus, and the information incorporated by reference herein and therein contain, and any free writing prospects we authorize for use in connection with this offering may contain, forward-looking statements that are based on our management’s belief and assumptions and on information currently available to our management. These statements relate to future events or our future financial performance, and involve known and unknown risks, uncertainties and other factors that may cause our actual results, levels of activity, performance or achievements to be materially different from any future results, levels of activity, performance or achievements expressed or implied by these forward-looking statements. Forward-looking statements include, but are not limited to, statements about:

 

the anticipated initiation of our clinical trials for ADI-001 in Non-Hodgkin’s lymphoma, or NHL, and the anticipated results;

 

the anticipated timing of our submission of INDs or equivalent regulatory filings and initiation of future clinical trials for ADI-002 in solid tumors, including the timing the anticipated results;

 

the impact of the current COVID-19 pandemic on our continuing operations, clinical development plans, including the timing of initiation and completion of studies or trials, financial forecasts and expectations, and other matters related to our business and operations;

 

the timing of and our ability to obtain and maintain regulatory approvals for our product candidates;

 

the rate and degree of acceptance and clinical utility of any products for which we receive regulatory approval;

 

our commercialization, marketing and manufacturing capabilities and strategy;

 

our intellectual property position and strategy;

 

our ability to identify additional product candidates with significant commercial potential;

 

our plans to enter into collaborations for the development and commercialization of product candidates;

 

the potential benefits of any future collaboration;

 

our ability to contract with third-party suppliers and manufacturers and their ability to perform adequately;

 

the success of competing therapies that are or may become available;

 

our ability to retain the continued service of our key professionals and to identify, hire, and retain additional qualified professionals;

 

our financial performance;

 

our expectations related to the use of cash, cash equivalents and marketable securities;

 

our estimates regarding expenses, future revenue, capital requirements and needs for additional financing;

 

our ability to remediate the material weaknesses in internal control over financial reporting and to maintain effective internal control over financial reporting;

S-4


 

 

our expectations regarding the time during which we will be an emerging growth company under the Jumpstart our Business Startups Act of 2012, or the JOBS Act;

 

our expected uses of the net proceeds from this offering and the concurrent private placement;

 

developments relating to our competitors and our industry; and

 

the impact of government laws and regulations.

These forward-looking statements are neither promises nor guarantees of future performance due to a variety of risks and uncertainties, many of which are beyond our control, which could cause actual results to differ materially from those indicated by these forward-looking statements, including, without limitation, the risk factors and cautionary statements described in other documents that we file from time to time with the SEC, specifically under “Item 1A: Risk Factors” and elsewhere in our most recent Annual Report on Form 10-K, and under similar headings in subsequent Quarterly Reports on Form 10-Q, or Current Reports on Form 8-K, and the section of the prospectus supplement titled “Risk Factors.”

You should read this prospectus supplement, the accompanying prospectus, and the information incorporated by reference herein and therein, completely and with the understanding that our actual future results may be materially different from what we expect. The forward-looking statements in this prospectus supplement and the documents we incorporate by reference herein represent our views as of their respective dates. We anticipate that subsequent events and developments will cause our views to change. However, while we may elect to update these forward-looking statements at some point in the future, we have no current intention of doing so except to the extent required by applicable law. You should, therefore, not rely on these forward-looking statements as representing our views as of any date subsequent to the date of this prospectus supplement.

S-5


 

 

 

PROSPECTUS SUPPLEMENT SUMMARY

This summary highlights certain information about us, this offering and the concurrent private placement and selected information contained elsewhere or incorporated by reference in this prospectus supplement and the accompanying prospectus. This summary is not complete and does not contain all the information that you should consider before making your investment decision. You should read this entire prospectus supplement and the accompanying prospectus carefully, especially the risks of investing in our securities discussed under “Risk Factors” beginning on page S-13 of this prospectus supplement, along with our financial statements and related notes and the other information incorporated by reference into this prospectus supplement and the accompanying prospectus and any free writing prospectus we authorize for use in connection with this offering, before making an investment decision. This prospectus supplement may add to, update or change information in the accompanying prospectus.

Overview

We are a biotechnology company discovering and developing allogeneic gamma delta T cell therapies for cancer and other diseases. We are advancing a pipeline of “off-the-shelf” gamma delta T cells, engineered with chimeric antigen receptors (CAR) and T cell receptor-like antibodies to enhance selective tumor targeting, facilitate innate and adaptive anti-tumor immune response, and improve persistence for durable activity in patients. Gamma delta cells are unique in that they may have an inherent capacity to persist following treatment, and can recognize and kill circulating tumor cells and to infiltrate and kill solid tumors. We believe that by applying our proprietary engineering and manufacturing approach to gamma delta T cells we will have significant advantages over alpha beta T cell-based therapies, which are the basis of standard CAR-T cell therapies and also natural killer (NK) cell-based therapies, which are currently in development.

Our proprietary engineering and manufacturing process begins with extracting gamma delta T cells from the blood of  healthy donors, and results in the potential to treat up to 1,000 patients per batch with an “off-the-shelf” product that is available on demand. The potential to administer product candidates based on gamma delta T cells to patients without inducing a graft versus host immune response could mean that our products can potentially be used as “off-the-shelf” therapies. This is in contrast to products based on alpha beta T cells, which either must be manufactured for each patient from his or her own T cells, or require significant gene editing to manufacture if the T cells are derived from donors that are unrelated to the patient. Based on what we believe is the unique potential of gamma delta T cells and associated modifications, we are initially developing product candidates in oncology, both for hematological malignancies and for solid tumors. In October 2020, the United States, or U.S., Food and Drug Administration, or FDA, cleared our IND application for ADI-001, our lead product candidate, for the treatment of NHL. The active IND enables us to initiate the first-in-human clinical trial to assess safety and efficacy of ADI-001 in NHL patients in the first quarter of 2021. The Phase 1 study for ADI-001 will enroll up to 80 late-stage NHL patients at a number of cancer centers across the U.S. The study includes a dose finding portion followed by dose expansion cohorts to explore the activity of ADI-001 in multiple subtypes of NHL. Site initiation activities are underway and interim clinical data from this study are expected in 2021. We intend to file an IND with the FDA in late 2021 for ADI-002, our first solid tumor product candidate.

Gamma delta T cells have unique attributes that we believe make them especially well-suited to be used for cancer therapy. Approximately 95% of T cells in circulation are so-called alpha beta T cells, named after the proteins that make up the cells’ T cell receptor, or TCR. The remaining T cells include a population that makes up between 1% and 5% of all T cells, the gamma delta T cells, along with a few other cell types. Distinct among immune cell populations, we believe gamma delta T cells have the following combination of attributes:

 

Can be used in any patient irrespective of the tissue-types of the patient i.e., a “universal” product

 

Can be used as required “off-the-shelf” after being expanded from healthy donors;

 

Are actively cytotoxic to tumor cells;

 

May functionally persist in patients for clinically meaningful periods or time;

 

Can replicate in an appropriate and measured way after manufacture and administration; Can have their reactivity to tumor cells enhanced further by the addition of a CAR;

 

Express both T cell and natural killer, or NK, cell receptors, facilitating both adaptive and innate anti-tumor immune responses; and

 

Can be manufactured in large numbers to facilitate the consistent treatment of many patients and avoids the cumbersome nature and expense of isolating  cells from each patient.