FLKS Flex Pharma, Inc.

Item 1.01 Entry into a Material Definitive Agreement.

Purchase Agreement and Registration Rights Agreement with Aspire Capital

On October 24, 2019, Salarius Pharmaceuticals, Inc. (the “Company”), entered into a common stock purchase agreement (the “Purchase Agreement”) with Aspire Capital Fund, LLC, an Illinois limited liability company (“Aspire Capital”), which provides that, upon the terms and subject to the conditions and limitations set forth therein, the Company may offer to Aspire Capital up to an aggregate of $10.9 million of shares of the Company’s common stock over the 30-month term of the Purchase Agreement (including shares issued as part of the initial purchase and commitment fee). Upon execution of the Purchase Agreement, the Company sold to Aspire Capital 210,526 shares of common stock at $4.75 per share for proceeds of $1,000,000. Concurrently with entering into the Purchase Agreement, the Company also entered into a registration rights agreement with Aspire Capital (the “Registration Rights Agreement”), in which the Company agreed to file with the Securities and Exchange Commission (the “SEC”) one or more registration statements, as necessary, and to the extent permissible and subject to certain exceptions, to register under the Securities Act of 1933, as amended for the sale of the shares of the Company’s common stock that have been and may be issued to Aspire Capital under the Purchase Agreement. The Company has filed with the SEC a prospectus supplement to the Company’s effective shelf registration statement on Form S-3 (File No. 333-231010) registering all of the shares of common stock that may be offered to Aspire Capital from time to time.

Under the Purchase agreement, on any trading day selected by the Company, the Company has the right, in its sole discretion, to present Aspire Capital with a purchase notice (each, a “Purchase Notice”), directing Aspire Capital (as principal) to purchase up to 50,000 shares of the Company’s common stock per business day, up to $500,000 of the Company’s common stock in the aggregate at a per share price (the “Purchase Price”) equal to the lesser of:

The Company and Aspire Capital also may mutually agree to increase the number of shares that may be sold to as much as an additional 2,000,000 shares per business day.

In addition, on any date on which the Company submits a Purchase Notice to Aspire Capital in an amount equal to 50,000 shares, the Company also has the right, in its sole discretion, to present Aspire Capital with a volume-weighted average price purchase notice (each, a “VWAP Purchase Notice”) directing Aspire Capital to purchase an amount of stock equal to up to 30% of the aggregate shares of the Company’s common stock traded on its principal market on the next trading day (the “VWAP Purchase Date”), subject to a maximum number of shares the Company may determine. The purchase price per share pursuant to such VWAP Purchase Notice is generally 97% of the volume-weighted average price for the Company’s common stock traded on its principal market on the VWAP Purchase Date.

The Purchase Price will be adjusted for any reorganization, recapitalization, non-cash dividend, stock split, or other similar transaction occurring during the period(s) used to compute the Purchase Price. The Company may deliver multiple Purchase Notices and VWAP Purchase Notices to Aspire Capital from time to time during the term of the Purchase Agreement, so long as the most recent purchase has been completed.

The Purchase Agreement provides that the Company and Aspire Capital shall not effect any sales under the Purchase Agreement on any purchase date where the closing sale price of the Company’s common stock is less than $0.25. There are no trading volume requirements or restrictions under the Purchase Agreement, and the Company will control the timing and amount of sales of the Company’s common stock to Aspire Capital. Aspire Capital has no right to require any sales by the Company, but is obligated to make purchases from the Company as directed by the Company in accordance with the Purchase Agreement. There are no limitations on use of proceeds, financial or business covenants, restrictions on future fundings, rights of first refusal, participation rights, penalties or liquidated damages in the Purchase Agreement. In consideration for entering into the Purchase Agreement, concurrently with the execution of the Purchase Agreement, the Company issued to Aspire Capital 101,810 shares of the Company’s common stock. The Purchase Agreement may be terminated by the Company at any time, at its discretion, without any cost to the Company. Aspire Capital has agreed that neither it nor any of its agents, representatives and affiliates shall engage in any direct or indirect short-selling or hedging of the Company’s common stock during any time prior to the termination of the Purchase Agreement. Any proceeds from the Company receives under the Purchase Agreement are expected to be used for working capital and general corporate purposes.

The foregoing is a summary description of certain terms of the Purchase Agreement and the Registration Rights Agreement and, by its nature, is incomplete. Copies of the Purchase Agreement and Registration Rights Agreement are filed herewith as Exhibits 10.1 and 4.1, respectively, to this Current Report on Form 8-K and are incorporated herein by reference.

The Company is filing the opinion of its counsel, Pillsbury Winthrop Shaw Pittman LLP, relating to the legality of the shares of common stock offered and sold pursuant to the Purchase Agreement, as Exhibit 5.1 hereto.