Gritstone bio(GRTS) - 2020 Q4 - Annual Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 OR Commission File Number 001-38663 Gritstone Oncology, Inc. (Exact name of Registrant as specified in its Charter) (State or other jurisdiction of incorporation or organization) 5959 Horton Street, Suite 300 Emeryville, CA 94608 (Address of principal executive offices) (Zip Code) Delawa ...