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  4. [Form 4] Werewolf Therapeutics, Inc. Insider Trading Activity

Werewolf Therapeutics insider sales on 10/27–10/29 at $1.55–$1.72

Filing Impact
(Moderate)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

Werewolf Therapeutics (HOWL) director Luke Evnin reported open‑market sales of common stock executed under a Rule 10b5‑1 plan dated September 24, 2025.

He sold 46,664 shares on 10/27/2025 at a weighted average price of $1.72, 44,327 shares on 10/28/2025 at $1.64, and 86,154 shares on 10/29/2025 at $1.55. Following these transactions, he beneficially owned 4,132,715 shares indirectly.

Footnotes state the sales were made across affiliated entities and that prices reflect weighted averages with full trade‑level details available upon request.

Positive

  • None.

Negative

  • None.
Insider EVNIN LUKE
Role Director
Sold 177,145 shs ($286K)
Type Security Shares Price Value
Sale Common Stock 86,154 $1.55 $134K
Sale Common Stock 44,327 $1.64 $73K
Sale Common Stock 46,664 $1.72 $80K
Holdings After Transaction: Common Stock — 4,132,715 shares (Indirect, See Footnote)
Footnotes (1)
  1. Transaction effected pursuant to a plan established pursuant to Rule 10b5-1 dated September 24, 2025. The shares were sold as follows: 4,992 by MPM Asset Management LLC ("AM LLC"), 31,538 by MPM BioVentures 2014, L.P. ("BV 2014"), 2,104 by MPM BioVentures 2014(B), L.P. ("BV 2014(B)"), 1,085 by MPM Asset Management Investors BV2014 LLC ("AM BV2014") and 6,945 by MPM Oncology Innovations Fund, L.P. ("MPM OIF"). 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.675 to $1.82 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. The shares are held as follows: 456,416 by AM LLC, 2,882,585 by BV 2014, 192,263 by BV 2014(B), 99,218 by AM BV2014 and 632,714 by MPM OIF. The Reporting Person disclaims beneficial ownership of the securities except to the extent of his pecuniary interest therein. The were sold as follows: 4,742 by AM LLC, 29,958 by BV 2014, 1,998 by BV 2014(B), 1,031 by AM BV2014 and 6,598 by MPM OIF. The Reporting Person disclaims beneficial ownership of the securities except to the extent of his pecuniary interest therein. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.605 to $1.70 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. The shares are held as follows: 451,674 by AM LLC, 2,852,627 by BV 2014, 190,265 by BV 2014(B), 98,187 by AM BV2014 and 626,116 by MPM OIF. The Reporting Person disclaims beneficial ownership of the securities except to the extent of his pecuniary interest therein. The were sold as follows: 9,216 by AM LLC, 58,227 by BV 2014, 3,884 by BV 2014(B), 2,004 by AM BV2014 and 12,823 by MPM OIF. The Reporting Person disclaims beneficial ownership of the securities except to the extent of his pecuniary interest therein. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.51 to $1.62 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. The shares are held as follows: 442,458 by AM LLC, 2,794,400 by BV 2014, 186,381 by BV 2014(B), 96,183 by AM BV2014 and 613,293 by MPM OIF. The Reporting Person disclaims beneficial ownership of the securities except to the extent of his pecuniary interest therein.
Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4 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
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response: 0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
X
 Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
EVNIN LUKE
(Last) (First) (Middle)
C/O MPM BIOIMPACT LLC
399 BOYLSTON STREET, SUITE 1100
(Street)
BOSTON MA 02116
(City) (State) (Zip)
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)
3. Date of Earliest Transaction (Month/Day/Year)
10/27/2025
4. If Amendment, Date of 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
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 10/27/2025 S(1) 46,664(2) D $1.72(3) 4,263,196 I See Footnote(4)
Common Stock 10/28/2025 S(1) 44,327(5) D $1.64(6) 4,218,869 I See Footnote(7)
Common Stock 10/29/2025 S(1) 86,154(8) D $1.55(9) 4,132,715 I See Footnote(10)
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 Securities Underlying Derivative Security (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: 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
Explanation of Responses:
1. Transaction effected pursuant to a plan established pursuant to Rule 10b5-1 dated September 24, 2025.
2. The shares were sold as follows: 4,992 by MPM Asset Management LLC ("AM LLC"), 31,538 by MPM BioVentures 2014, L.P. ("BV 2014"), 2,104 by MPM BioVentures 2014(B), L.P. ("BV 2014(B)"), 1,085 by MPM Asset Management Investors BV2014 LLC ("AM BV2014") and 6,945 by MPM Oncology Innovations Fund, L.P. ("MPM OIF"). 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.
3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.675 to $1.82 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. The shares are held as follows: 456,416 by AM LLC, 2,882,585 by BV 2014, 192,263 by BV 2014(B), 99,218 by AM BV2014 and 632,714 by MPM OIF. The Reporting Person disclaims beneficial ownership of the securities except to the extent of his pecuniary interest therein.
5. The were sold as follows: 4,742 by AM LLC, 29,958 by BV 2014, 1,998 by BV 2014(B), 1,031 by AM BV2014 and 6,598 by MPM OIF. The Reporting Person disclaims beneficial ownership of the securities except to the extent of his pecuniary interest therein.
6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.605 to $1.70 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.
7. The shares are held as follows: 451,674 by AM LLC, 2,852,627 by BV 2014, 190,265 by BV 2014(B), 98,187 by AM BV2014 and 626,116 by MPM OIF. The Reporting Person disclaims beneficial ownership of the securities except to the extent of his pecuniary interest therein.
8. The were sold as follows: 9,216 by AM LLC, 58,227 by BV 2014, 3,884 by BV 2014(B), 2,004 by AM BV2014 and 12,823 by MPM OIF. The Reporting Person disclaims beneficial ownership of the securities except to the extent of his pecuniary interest therein.
9. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.51 to $1.62 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.
10. The shares are held as follows: 442,458 by AM LLC, 2,794,400 by BV 2014, 186,381 by BV 2014(B), 96,183 by AM BV2014 and 613,293 by MPM OIF. The Reporting Person disclaims beneficial ownership of the securities except to the extent of his pecuniary interest therein.
/s/ Luke Evnin 10/29/2025
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did HOWL director Luke Evnin report?

He reported open‑market sales of common stock across three days executed under a Rule 10b5‑1 plan.

On what dates did the HOWL insider sales occur?

The sales occurred on 10/27/2025, 10/28/2025, and 10/29/2025.

How many HOWL shares were sold and at what weighted average prices?

He sold 46,664 at $1.72, 44,327 at $1.64, and 86,154 at $1.55.

Was a Rule 10b5‑1 plan used for these transactions?

Yes. The transactions were effected pursuant to a Rule 10b5‑1 plan dated September 24, 2025.

What is Luke Evnin’s beneficial ownership after the sales?

He beneficially owned 4,132,715 shares indirectly following the reported transactions.

Were the prices single fills or averages?

They are weighted average prices, with individual trade details available upon request, per the footnotes.

How is ownership held according to the filing?

The filing lists indirect holdings across affiliated entities, as detailed in the footnotes.