Sec Form 4 Filing - Joseph Donald @ Acer Therapeutics Inc. - 2023-11-17

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Joseph Donald 2. Issuer Name and Ticker or Trading Symbol Acer Therapeutics Inc. [ ACER] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) See Remarks (Last) (First) (Middle) C/O ACER THERAPEUTICS INC. ONE GATEWAY, CENTER SUITE 356, 300 WASHINGTON STREET 3. Date of Earliest Transaction (MM/DD/YY) 11/17/2023 (Street) NEWTON, MA02458 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock, $0.0001 par value per share 11/17/2023 D( 1 )( 2 )( 3 ) 14,285 D 0 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Joseph Donald C/O ACER THERAPEUTICS INC. ONE GATEWAY CENTER SUITE 356, 300 WASHINGTON STREET NEWTON, MA02458 See Remarks Signatures /s/ Harry S. Palmin, as Attorney-in-Fact 11/20/2023 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Pursuant to the Agreement and Plan of Merger (the "Merger Agreement"), dated as of August 30, 2023, by and among Acer Therapeutics Inc., a Delaware corporation ("Issuer"), Zevra Therapeutics, Inc., a Delaware corporation ("Zevra"), and Aspen Z Merger Sub, Inc., a Delaware corporation and wholly-owned subsidiary of Zevra ("Merger Sub"), effective November 17, 2023 (the "Effective Time"), Merger Sub merged with and into the Issuer, with the Issuer continuing as the surviving corporation and a wholly-owned subsidiary of Zevra. ( 2 )Pursuant to the Merger Agreement, at the Effective Time, each share of Issuer common stock, $0.0001 par value per share, issued and outstanding immediately prior to the Effective Time, was converted into the right to receive (i) 0.1210 fully paid and non-assessable shares of common stock of Zevra, par value $0.0001 per share, and (ii) one non-transferable contingent value right issued by Zevra, which entitles the holder to potentially receive their pro rata portion of contingent payments of (A) up to $76 million in cash upon the achievement of certain commercial and regulatory milestones for certain of Acer's products and (B) additional cash of an indeterminate amount, subject to achievement of milestones related to Acer's early-phase emetine program, and otherwise subject to and in accordance with the terms and conditions of the Contingent Value Rights Agreement, dated as of November 17, 2023, by and among Zevra, Computershare Inc. and Computershare Trust Company. ( 3 )(Continued From Footnote 2) At the Effective Time, the closing price of one share of Zevra common stock was $4.34.

Remarks: CHIEF LEGAL OFFICER AND SECRETARY

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