UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT ☒ OF 1934 For the quarterly period ended March 31, 2023 or TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT ☐ OF 1934 Commission File Number: 000-30235 EXELIXIS, INC. (Exact name of registrant as specified in its charter) Delaware 04-3257395 (State or other jurisdiction of incorporation or organization) (I.R.S. Employ ...