X0206 3 2017-01-26 0 0001640455 Jounce Therapeutics, Inc. JNCE 0001641080 Hadley Harbor Master Investors (Cayman) L.P. C/O WELLINGTON MANAGEMENT COMPANY LLP 280 CONGRESS STREET BOSTON MA 02210 0 0 1 0 No securities are benefically owned 0 D Series B Convertible Preferred Stock Common Stock 719476 D Each share of Series B convertible preferred stock is convertible into 0.271003 shares of common stock at the option of the reporting person or upon the occurrence of certain events. All outstanding shares of Series B convertible preferred stock are expected to convert into shares of common stock immediately prior to the amendment and restatement by Jounce Therapeutics, Inc. of its certificate of incorporation, provided the amendment and restatement occurs prior to, and on the same day as, the closing of its initial public offering at an initial public offering price that results in at least $35 million of gross proceeds, after deducting the underwriting discount and commissions, to Jounce Therapeutics, Inc. Hadley Harbor Master Investors (Cayman) L.P., By: Wellington Alternative Investments LLC, as General Partner, /s/ Matthew N. Shea, Title: Managing Director and Counsel 2017-01-24