Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule405 of the Securities Act.Yes☑No☐ Indicate by check mark if the registrant is not required to file reports pursuant to Section13 or Section15(d)of the Act.Yes☐No☑ Indicate by check mark whether the registrant (1)has filed all reports required to be filed by Section13 or 15(d)of the Securities ExchangeAct of 1934 during the preceding 12months (or for such shorter period that the registrant was required to file such reports), and (2)has beensubject to such filing requirements for the past 90days. Yes☑No☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant toRule405 of Regulation S-T (§232.405 of this chapter) during the preceding 12months (or for such shorter period that the registrant wasrequired to submit such files).Yes☑No☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reportingcompany or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and“emerging growth company” in Rule12b-2 of the Exchange Act. If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complyingwith any new or revised financial accounting standards provided pursuant to Section13(a)of the Exchange Act.☐ Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness ofits internal control over financial reporting under Section404(b)of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered publicaccounting firm that prepared or issued its audit report.☑ If securities are registered pursuant to Section12(b)of the Act, indicate by check mark whether the financial statements of the registrantincluded in the filing reflect the correction of an error to previously issued financial statements.☐ Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-basedcompensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule12b-2 of the Act).Yes☐No☑ The aggregate market value of the voting common stock held by non-affiliates of the registrant as of June30, 2025 was approximately$20.2billion, based upon the closing price of $31.81 per share as reported by the New York Stock Exchange on such date. On March 31, 2026,621 million shares of common stock were outstanding.DOCUMENTS INCORPORATED BY REFERENCE None. Audit Firm ID: 185 EXPLANATORY NOTE Devon Energy Corporation (the “Company,” “Devon,” “our,” “us” or “we”) is filing this Amendment No. 1 on Form 10-K/A(this “Amendment”) to our Annual Report on Form 10-K for the fiscal year ended December 31, 2025 (the “OriginalFiling”), which was filed with the U.S. Securities and Exchange Commission (the “SEC”) on February 18, 2026. ThisAmendment is being filed to include the information required by Items 10 through 14 of Part III of Form 10-K. Thisinformation was previously omitted from the Original Filing in reliance on General Instruction G(3) to Form 10-K, whichpermits the information in Part III to be incorporated in the Form 10-K by reference from the definitive proxy statement ifsuch statement is filed no later than 120 days after the end of the fiscal year covered by the Form 10-K. We are filingthis Amendment to include Part III information in the Original Filing. This Amendment amends and restates in their entirety Items 10, 11, 12, 13 and 14 of Part III of the Original Filing. Thecover page of our Original Filing is also amended to delete the reference to the incorporation by reference of portions ofour definitive proxy statement into Part III of the Original Filing. In addition, as required by Rule 12b-15 under theSecurities Exchange Act of 1934, as amended (the “Exchange Act”), Item 15 of Part IV of the Original Filing is herebyamended solely to include, as Exhibits 31.3 and 31.4, new certifications by the Company’s principal executive officerand principal financial officer pursuant to Rule 13a-14(a) under the Exchange Act. Except as set forth herein, this Amendment does not amend or otherwise update any other information in the OriginalFiling, and the Original Filing, as amended by this Amendment, continues to speak as of the date of the Original Filing.Accordingly, this Amendment should be read in conjunction with the Original Filing and with our filings with the SECsubsequent to the Original Filing. Information Regarding Forward-Looking Statements This Amendment includes “forward-looking statements” within the meaning of the federal securities laws. Suchstatements include those co