Sec Form 3 Filing - Ros Matthew E @ Jasper Therapeutics, Inc. - 2026-07-16

FORM 3 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 Ros Matthew E 2. Issuer Name and Ticker or Trading Symbol Jasper Therapeutics, Inc. [ JSPR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Operating Officer (Last) (First) (Middle) C/O JASPER THERAPEUTICS, INC., 2200 BRIDGE PKWY, SUITE #102 3. Date of Earliest Transaction (MM/DD/YY) 07/16/2026 (Street) REDWOOD CITY, CA94065 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

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 Stock Option (Right to Buy) $ 0.01 ( 1 )( 2 )( 3 ) ( 1 )( 2 )( 3 ) Voting Common Stock 103,204 D Stock Options (Right to Buy) $ 0.61 ( 1 )( 2 )( 3 )( 4 ) ( 1 )( 2 )( 3 )( 4 ) Non Voting Convertible Preferred Stock 92,278 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Ros Matthew E C/O JASPER THERAPEUTICS, INC. 2200 BRIDGE PKWY, SUITE #102 REDWOOD CITY, CA94065 Chief Operating Officer Signatures /s/ Herb Cross, as Attorney-in-Fact 07/22/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Pursuant to the Agreement and Plan of Merger by and among Kira Pharmaceuticals ("Kira"), Jasper Therapeutics, Inc. ("Jasper") and Kira Holdco Inc. ("Merger Sub"), a wholly owned subsidiary of Jasper, dated July 16, 2026 (the "Merger Agreement"), Kira merged with and into Merger Sub, with Merger Sub surviving (the "Merger"). Each option to purchase shares of Kira ordinary shares (each, a "Kira Option") that was outstanding and unexercised immediately prior to the closing of the Merger, whether or not vested, was converted into and became an option to purchase Jasper's voting common stock, par value $0.0001 per share ("Voting Common Stock") and shares of the Jasper Non-Voting Convertible Preferred Stock, par value $0.0001 ("Preferred Stock") pursuant to the terms and conditions of the Merger Agreement. ( 2 )Beginning on June 7, 2026, the option vests in equal monthly installments over 48 months, subject to the Reporting Person's continued service to Issuer through each vesting date. ( 3 )Pursuant to the Merger Agreement, the Reporting Person received 103, 204 options to purchase shares of Voting Common Stock and 92,278 options to purchase shares of Preferred Stock in exchange for 622,456 Kira Options. ( 4 )On the third business day following the receipt of stockholder approval of the conversion of the Preferred Stock, each share of preferred stock shall automatically convert into 61 shares of the Issuer's Voting Common Stock, subject to certain limitations, including that a holder of Preferred Stock is prohibited from converting shares of preferred stock into shares of Voting Common Stock if, as a result of such conversion, such holder, together with its affiliates, would beneficially own more than a specified percentage (to be established by the holder between 4.9% and 19.9%) of the total number of shares of Voting Common Stock issued and outstanding immediately after giving effect to such conversion. The Preferred Stock has no expiration date.

Remarks: Exhibit 24 - Power of Attorney

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