Joint Filer Information

Name:	Deerfield Mgmt, L.P., Deerfield Management Company, L.P. and Deerfield Partners, L.P.
Address:	345 Park Avenue South, 12th Floor New York, NY 10017
Designated Filer:	James E. Flynn
Issuer and Ticker Symbol:	Werewolf Therapeutics, Inc. [HOWL]
Date of Event Requiring Statement:	April 29, 2021

The undersigned, Deerfield Mgmt, L.P., Deerfield Management Company, L.P. and Deerfield Partners, L.P., are jointly filing the attached Initial Statement of Beneficial Ownership on Form 3 with James E. Flynn with respect to the beneficial ownership of securities of Werewolf Therapeutics, Inc.

Signatures:

DEERFIELD MGMT, L.P.

By: J.E. Flynn Capital, LLC, General Partner

By: /s/ Jonathan Isler

Jonathan Isler, Attorney-In-Fact

DEERFIELD MANAGEMENT COMPANY, L.P.

By: Flynn Management LLC, General Partner

By: /s/ Jonathan Isler

Jonathan Isler, Attorney-In-Fact

DEERFIELD PARTNERS, L.P.

By: Deerfield Mgmt, L.P., General Partner

By: J.E. Flynn Capital, LLC, General Partner

By: /s/ Jonathan Isler

Jonathan Isler, Attorney-In-Fact