Planned Rule 144 sale of common shares

A holder of HOWL common stock has filed a Rule 144 notice to sell 13,256 shares of common stock through Merrill Lynch on the NASDAQ, with an aggregate market value of $8,542.17, around January 6, 2026.

Rhea-AI Filing Summary

A holder of HOWL common stock has filed a Rule 144 notice to sell 13,256 shares of common stock through Merrill Lynch on the NASDAQ, with an aggregate market value of $8,542.17, around January 6, 2026.

The issuer had 48,540,200 shares outstanding at the time referenced. The shares to be sold were originally acquired from the issuer in a private placement on May 4, 2021, for cash.

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Accepted by SEC EDGAR 01/06/2026 - 04:57 PM EST Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001609493
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Werewolf Therapeutics, Inc.
SEC File Number	001-40366
Address of Issuer	200 Talcott Avenue 2nd Floor Watertown MASSACHUSETTS 02472
Phone	6179520555
Name of Person for Whose Account the Securities are To Be Sold	MPM BioVentures 2014 (B), L.P.
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Shareholder

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Merrill Lynch 555 California Street 18th Floor San Francisco CA 94104	13256	8542.17	48540200	01/06/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	05/04/2021	Private Placement	Issuer			13256	05/04/2021	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks	Please see attached for securities sold over the last 3 months
Date of Notice	01/06/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	09/24/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	Kristen Laguerre
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)