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Merrimack Pharmaceuticals Issues Letter to Shareholders

CAMBRIDGE, Mass.--(BUSINESS WIRE)--The Board of Directors of Merrimack Pharmaceuticals, Inc. (Nasdaq: MACK) (the “Company” or “Merrimack”) today issued a letter to shareholders in connection with the Company’s upcoming 2019 Annual Meeting of Shareholders (the “2019 Annual Meeting”), which is scheduled to be held on October 17, 2019.