Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT ☒ OF 1934 For the quarterly period ended September 30, 2023 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: 001-35167 Kosmos Energy Ltd. (Exact name of registrant as specified in its charter) Delaware 98-0686001 (State o ...