Item 8.01 Other Events. The purpose of this filing is to provide certain unaudited pro forma combined financial information in connection with the previously disclosed proposed merger of Devon Energy Corporation, a Delaware corporation (the “ Company” or “ Devon”), Cubs Merger Sub, Inc., a Delaware corporation and a wholly-owned, direct subsidiary of the Company, and Coterra Energy Inc., a Delaware corporation (“ Coterra”), pursuant to which Coterra will become a wholly-owned subsidiary of the Company, subject to the terms and conditions set forth in the merger agreement. Exhibit 99.1 to this Current Report on Form8-Kpresents the following unaudited pro forma combined financial information, which has been prepared in accordance with Article 11 of RegulationS-X:

Item 9.01 Financial Statements and Exhibits. (d) Exhibits Exhibit Description Number ───────────────────────────────────────────────────────────────────────────────────────────── 99.1 Unaudited Pro Forma Combined Financial Statements. 104 Cover Page Interactive Data File (embedded within the Inline XBRL document). SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. DEVON ENERGY CORPORATION By: /s/ Jeffrey L. Ritenour Jeffrey L. Ritenour Executive Vice President and Chief Financial Officer Date: April 10, 2026