On December 16, 2022, J. Duncan Higgons, a Class I director, notified Jounce Therapeutics, Inc. of his resignation from the Board of Directors and all committees thereof, effective as December 31, 2022. The resignation is not a result of any disagreement with the Company on any matter relating to the Company's operations, policies or practices. Mr. Higgons intends to pursue other business opportunities.

The Company thanks Mr. Higgons for his years of service as a director.