Item 8.01 Other Events On June 5, 2026, Devon Energy Corporation (the “ Company” or “ Devon”) filed a prospectus supplement (the “ Prospectus Supplement”) to its previously filed automatic shelf registration statement on FormS-3(333-294988)registering the issuance of up to an aggregate of 175,000 shares of the Company’s common stock, par value $0.10 per share (the “ Shares”).

Item 9.01 Financial Statements and Exhibits. (d) Exhibits Exhibit Description No. ─────────────────────────────────────────────────────────────────────────────────────────────────────────── 5.1 Opinion of Skadden, Arps, Slate, Meagher & Flom LLP relating to the Prospectus Supplement. 23.1 Consent of Skadden, Arps, Slate, Meagher & Flom LLP (included in Exhibit 5.1). 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 Date: June 5, 2026 /s/ Marcus G. Bolinder Marcus G. Bolinder Secretary