Merrimack
May 27, 2014

Merrimack Pharmaceuticals to Present at the Jefferies 2014 Global Healthcare Conference

CAMBRIDGE, Mass., May 27, 2014 (GLOBE NEWSWIRE) -- Merrimack Pharmaceuticals, Inc. (Nasdaq:MACK) today announced that Robert Mulroy, President & CEO, is scheduled to present at the Jefferies 2014 Global Healthcare Conference on Tuesday, June 3, 2014 at 4:00 p.m. (ET) in New York City.

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

About Merrimack

Merrimack is a biopharmaceutical company discovering, developing and preparing to commercialize innovative medicines paired with companion diagnostics for the treatment of cancer. Merrimack seeks to gain a deeper understanding of underlying cancer biology through its systems biology-based approach and develop new insights, therapeutics and diagnostics to improve outcomes for cancer patients. Merrimack currently has six oncology therapeutics in clinical development and three additional candidates in late stage preclinical development. For more information, please visit Merrimack's website at www.merrimackpharma.com.

Forward-Looking Statements

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: Investor Contact:

         Geoffrey Grande, CFA

         Merrimack

         617-441-7602

         ggrande@merrimackpharma.com



         Media Contact:

         Dana Robie

         Merrimack

         617-441-7408

         drobie@merrimackpharma.com

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Source: Merrimack Pharmaceuticals

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