Sec Form 4 Filing - Young, III Shannon E. @ DEVON ENERGY CORP/DE - 2026-05-07

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Young, III Shannon E. 2. Issuer Name and Ticker or Trading Symbol DEVON ENERGY CORP/DE [ DVN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) EVP, CFO (Last) (First) (Middle) THREE MEMORIAL CITY PLAZA, 840 GESSNER ROAD, SUITE 1400 3. Date of Earliest Transaction (MM/DD/YY) 05/07/2026 (Street) HOUSTON, TX77024 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock ( 1 ) 05/07/2026 A 129,490 A 129,490 D Common Stock ( 2 ) 05/07/2026 A 96,995 A 226,485 D Common Stock ( 3 ) ( 4 ) 05/07/2026 A 48,197 A 274,682 D Common Stock ( 3 ) ( 5 ) 05/07/2026 A 48,798 A 323,480 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Young, III Shannon E. THREE MEMORIAL CITY PLAZA 840 GESSNER ROAD, SUITE 1400 HOUSTON, TX77024 EVP, CFO Signatures /s/ Edward T. Highberger, attorney-in-fact 05/11/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On May 7, 2026, pursuant to the Agreement and Plan of Merger entered into on February 1, 2026, by and among Devon Energy Corporation (''Devon''), Coterra Energy Inc. (''Coterra") and Cubs Merger Sub, Inc. (the ''Merger Agreement''), as of the effective time of the transactions contemplated thereby (the "Effective Time"), Coterra became a wholly owned subsidiary of Devon. Pursuant to the Merger Agreement, at the Effective Time, each share of Coterra's common stock, par value $0.10 per share ("Coterra Common Stock") was converted into the right to receive 0.7 shares of Devon's common stock, par value $0.10 per share ("Devon Common Stock"), subject to certain exceptions. ( 2 )Pursuant to the Merger Agreement, at the Effective Time, each time-based Coterra restricted stock unit ("Coterra RSU") outstanding and unvested as of immediately prior to the Effective Time was converted into 0.7 Devon time-based restricted stock units ("Devon RSUs"), with each Devon RSU representing a contingent right to receive a share of Devon Common Stock, subject to the same terms and conditions as were applicable to the corresponding Coterra RSU immediately prior to the Effective Time. The Coterra RSUs granted to the reporting person on February 24, 2026 were converted into 48,197 Devon RSUs, which will vest on January 31, 2029, and the Coterra RSUs granted to the reporting person on February 19, 2025 were converted into 48,798 Devon RSUs, which will vest on January 31, 2028. ( 3 )These Devon RSUs relate to an award of Coterra performance stock units (a "Coterra PSU Award") that, pursuant to the Merger Agreement, at the Effective Time, was deemed earned at 100% of the target level as a result of the certification by the Compensation Committee of Coterra's board of directors to the actual level of performance achieved under the terms of such Coterra PSU Award prior to the Effective Time and was converted, on the same terms and conditions (other than any continuing performance-based vesting conditions and cash settlement features), into an award of Devon RSUs covering a number of shares of Devon Common Stock equal to the product of (i) the target number of shares of Coterra Common Stock subject to such Coterra PSU Award as of immediately prior to the Effective Time, multiplied by (ii) 0.7. ( 4 )The Coterra PSU Award to which these Devon RSUs relate was granted to the reporting person on February 24, 2026 and, at the Effective Time, converted into 48,197 Devon RSUs, which will vest on January 31, 2029. ( 5 )The Coterra PSU Award to which these Devon RSUs relate was granted to the reporting person on February 19, 2025 and, at the Effective Time, converted into 48,798 Devon RSUs, which will vest on January 31, 2028.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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