Item 1.01 Entry into a Material Definitive
Agreement.
On October 29, 2019,
SELLAS Life Sciences Group, Inc., a Delaware corporation (the “Company”), entered into an Equity Distribution
Agreement (the “Distribution Agreement”) with Maxim Group LLC (“Maxim”), as sales agent,
in connection with an “at the market offering” under which the Company from time to time may offer and sell shares
of its common stock, par value $0.0001 per share (the “Common Stock”), having an aggregate offering price of
up to $5,000,000 (the “Shares”). Shares sold under the Distribution Agreement will be offered and sold pursuant
to the Company’s previously filed and effective Registration Statement on Form S-3 (Registration No. 333- 233869) (the “Registration
Statement”) and a prospectus supplement and accompanying base prospectus that the Company filed with the Securities and
Exchange Commission (the “SEC”) relating to the Shares on October 29, 2019.
Subject to the terms
and conditions of the Distribution Agreement, Maxim will use its commercially reasonable efforts consistent with its normal trading
and sales practices to sell the Shares from time to time, based upon the Company’s instructions, including any price, time
or size limits specified by the Company. The Company has provided Maxim with customary indemnification rights, and Maxim will be
entitled to a commission at a fixed commission rate equal to 3.0% of the gross sales price of all Shares sold. In addition, pursuant
to the terms of the Distribution Agreement, the Company has agreed to reimburse Maxim for the documented fees and costs of its
legal counsel reasonably incurred in connection with (i) entering into the transactions contemplated by the Distribution Agreement
in an amount not to exceed $40,000 in the aggregate (inclusive of an advance of $20,000 payable to Maxim upon entrance into the
Distribution Agreement) and (ii) Maxim’s ongoing due diligence, drafting and other filing requirements arising from the transactions
contemplated by the Distribution Agreement in an amount not to exceed $5,000 in the aggregate per calendar quarter. Sales of the
Shares, if any, under the Distribution Agreement may be made in transactions that are deemed to be “at the market offerings”
as defined in Rule 415 under the Securities Act of 1933, as amended (the “Securities Act”). The Company has
no obligation to sell any of the Shares, and may at any time suspend sales under the Distribution Agreement or terminate the Distribution
Agreement. The Distribution Agreement will terminate upon the sale of all of the Shares under the Distribution Agreement unless
terminated earlier by either party as permitted under the Distribution Agreement.
The Company currently
intends to use the net proceeds from the offering, if any, for working capital, capital expenditures and other general purposes,
including research and development of our product candidates (including clinical trial activities), and general and administrative
expenses.
The foregoing description
of the Distribution Agreement does not purport to be complete and is qualified in its entirety by reference to the Distribution
Agreement, a copy of which is filed as Exhibit 10.1 to this Current Report on Form 8-K and incorporated herein by reference.
This Current Report
on Form 8-K shall not constitute an offer to sell or the solicitation of an offer to buy the Shares, nor shall there be any offer,
solicitation or sale of the Shares in any state or country in which such offer, solicitation or sale would be unlawful prior to
registration or qualification under the securities laws of any such state or country.
The legal opinion
of the Company’s counsel regarding the validity of the Shares is filed as Exhibit 5.1 to this Current Report on Form
8-K. The Company cautions you that statements included in this Current Report on Form 8-K that are not a description of
historical facts are forward-looking statements. These forward-looking statements include statements regarding the
Company’s ability to sell Shares pursuant to the Distribution Agreement. The inclusion of forward-looking statements
should not be regarded as a representation by the Company that any of these statements, results or sales will be achieved or
completed due in part to risks and uncertainties inherent in the Company’s business, including those described in the
Company’s Annual Report on Form 10-K for the year ended December 31, 2018 and Quarterly Report on Form 10-Q for the
quarter ended June 30, 2019, filed with the SEC on March 22, 2019 and August 14, 2019, respectively. You are cautioned not to
place undue reliance on these forward-looking statements, which speak only as of the date hereof, and the Company undertakes
no obligation to revise or update this report to reflect events or circumstances after the date hereof. All forward-looking
statements are qualified in their entirety by this cautionary statement. This caution is made under the safe harbor
provisions of Section 21E of the Private Securities Litigation Reform Act of 1995.