0001193125-17-370765 Sample Contracts

MERRIMACK PHARMACEUTICALS, INC. $40,000,000 of shares of Common Stock, par value $0.01 per share Sales Agreement
Sales Agreement • December 15th, 2017 • Merrimack Pharmaceuticals Inc • Pharmaceutical preparations • New York

Merrimack Pharmaceuticals, Inc., a Delaware corporation (the “Company”), confirms its agreement (this “Agreement”) with Cowen and Company, LLC (“Cowen”), as follows: