Merrimack to Present at the Cowen and Company 33rd Annual Health Care Conference

CAMBRIDGE, Mass., Feb. 25, 2013 (GLOBE NEWSWIRE) -- Merrimack Pharmaceuticals, Inc. (Nasdaq:MACK) today announced that Robert Mulroy, President & CEO, is scheduled to present at the Cowen and Company 33^rd Annual Health Care Conference on Wednesday, March 6, 2013 at 8:00 a.m. (ET) at the Boston Marriott Copley Place in Boston, Massachusetts.

A live webcast of Merrimack's presentation can be accessed by visiting the investor relations section of the company's website at investors.merrimackpharma.com. A replay of the webcast will be archived on Merrimack's website for two weeks following the presentation.

About Merrimack Pharmaceuticals, Inc.

Merrimack Pharmaceuticals is a biopharmaceutical company discovering, developing and preparing to commercialize innovative medicines paired with companion diagnostics for the treatment of serious diseases, with an initial focus on cancer. Merrimack applies Network Biology, its proprietary systems biology-based approach to biomedical research, throughout the research and development process. Merrimack currently has six targeted therapeutic oncology candidates in clinical development.

Forward-Looking Statement

Any statements in this press release about future expectations, plans and prospects for Merrimack constitute forward-looking statements within the meaning of The Private Securities Litigation Reform Act of 1995, as amended. Actual results may differ materially from those indicated by such forward-looking statements. Merrimack anticipates that subsequent events and developments will cause its views to change. However, while Merrimack may elect to update these forward-looking statements at some point in the future, Merrimack specifically disclaims any obligation to do so.

CONTACT: Media Contacts:



         Kathleen Petrozzelli Gallagher

         Merrimack

         617-441-1043

         kgallagher@merrimackpharma.com



         Liz Bryan

         Spectrum

         202-955-6222

         lbryan@spectrumscience.com

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