On November 30, 2020, Jean-Marc Bellemin, the Chief Financial Officer of Gritstone Oncology, Inc. notified the company of his decision to pursue other opportunities and resign from his position at the company effective December 11, 2020. Mr. Bellemin's resignation is not a result of any disagreement with the company on any matter relating to the company's operations, policies or practices. The company is initiating a search for a new Chief Financial Officer.