Joint Filer Information

Names:	Deerfield Management Company, L.P., Deerfield Private Design Fund III, L.P., Deerfield Mgmt III, L.P., Deerfield Healthcare Innovations Fund, L.P., Deerfield Mgmt HIF, L.P., Deerfield Private Design Fund IV, L.P., Deerfield Mgmt IV, L.P., Deerfield Partners, L.P. and Deerfield Mgmt, L.P.

Address:	345 Park Avenue South, 12^th Floor New York, NY 10010

Designated Filer:	James E. Flynn

Issuer and Ticker Symbol:	Larimar Therapeutics, Inc. [LRMR]

Date of Event Requiring Statement:	July 31, 2025

The undersigned, Deerfield Management Company, L.P., Deerfield Private Design Fund III, L.P., Deerfield Mgmt III, L.P., Deerfield Healthcare Innovations Fund, L.P., Deerfield Mgmt HIF, L.P., Deerfield Private Design Fund IV, L.P., Deerfield Mgmt IV, L.P., Deerfield Partners, L.P. and Deerfield Mgmt, L.P. are jointly filing the attached Statement of Changes in Beneficial Ownership on Form 4 with James E. Flynn with respect to the beneficial ownership of securities of Larimar Therapeutics, Inc.

Signatures:

DEERFIELD MANAGEMENT COMPANY, L.P.

By: Deerfield UGP, LLC, General Partner

By: /s/ Jonathan Isler

DEERFIELD MANAGEMENT COMPANY, L.P. 4