Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

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

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(Print or Type Responses)

1. Name and Address of Reporting Person * EVNIN LUKE 2. Issuer Name and Ticker or Trading Symbol Werewolf Therapeutics, Inc. [HOWL] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O MPM BIOIMPACT LLC, 399 BOYLSTON STREET, SUITE 1100 3. Date of Earliest Transaction (Month/Day/Year) 04/30/2026 (Street) BOSTON, MA 02116 4. If Amendment, Date Original Filed (Month/Day/Year) 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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 04/30/2026 S(1) 168,262(2) D $0.72(3) 1,785,687 I See Footnotes(4)(5) Common Stock 05/01/2026 S(1) 58,394(6) D $0.73(7) 1,727,293 I See Footnotes(4)(8) Common Stock 05/04/2026 S(1) 47,963(9) D $0.72(10) 1,679,330 I See Footnotes(4)(11)

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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 (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

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 (Month/Day/Year)

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
EVNIN LUKE C/O MPM BIOIMPACT LLC 399 BOYLSTON STREET, SUITE 1100 BOSTON, MA 02116	X

Signatures

/s/ Luke Evnin		05/04/2026
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Transaction effected pursuant to a plan established pursuant to Rule 10b5-1 dated March 26, 2026.
(2)	The shares were sold as follows: 18,028 by MPM Asset Management LLC ("AM LLC"), 113,821 by MPM BioVentures 2014, L.P. ("BV 2014"), 7,592 by MPM BIoVentures 2014(B), L.P. ("BV 2014(B)"), 3,918 by MPM Asset Management Investors BV2014 LLC ("AM BV2014") and 24,903 by MPM Oncology Innovations Fund, L.P. ("MPM OIF").
(3)	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $0.688 to $0.7458 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
(4)	MPM BioVentures 2014 GP LLC and MPM BioVentures 2014 LLC ("BV LLC") are the direct and indirect general partners of BV 2014 and BV 2014(B). BV LLC is the manager of AM BV2014. MPM Oncology Innovations Fund GP LLC ("MPM OIF GP") is the general partner of MPM OIF. Luke Evnin is a member of AM LLC, a Managing Director of BV LLC and a manager of MPM OIF GP. The Reporting Person disclaims beneficial ownership of the securities except to the extent of his pecuniary interest therein.
(5)	The shares are held as follows: 191,318 by AM LLC, 1,207,945 by BV 2014, 80,567 by BV 2014(B), 41,576 by AM BV2014 and 264,281 by MPM OIF.
(6)	The shares were sold as follows: 6,256 by AM LLC, 39,501 by BV 2014, 2,635 by BV 2014(B), 1,360 by AM BV2014 and 8,642 by MPM OIF.
(7)	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $0.7011 to $0.74 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
(8)	The shares are held as follows: 185,062 by AM LLC, 1,168,444 by BV 2014, 77,932 by BV 2014(B), 40,216 by AM BV2014 and 255,639 by MPM OIF.
(9)	The shares were sold as follows: 5,139 by AM LLC, 32,445 by BV 2014, 2,164 by BV 2014(B), 1,117 by AM BV2014 and 7,098 by MPM OIF.
(10)	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $0.69 to $0.7497 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
(11)	The shares are held as follows: 179,923 by AM LLC, 1,135,999 by BV 2014, 75,768 by BV 2014(B), 39,099 by AM BV2014 and 248,541 by MPM OIF.

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