Index to Financial Statements 2023 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, 2023 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE ☐ SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-35349 Phillips 66 (Exact name of registrant as specified in its charter) Delaware 45-3779385 (Sta ...