Sec Form 4 Filing - Lacy Christopher W @ SOUTHWESTERN ENERGY CO - 2024-10-01

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 Lacy Christopher W 2. Issuer Name and Ticker or Trading Symbol SOUTHWESTERN ENERGY CO [ SWN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) See Remarks (Last) (First) (Middle) 10000 ENERGY DRIVE 3. Date of Earliest Transaction (MM/DD/YY) 10/01/2024 (Street) SPRING, TX77389 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 10/01/2024 G( 1 ) 14,064 D $ 7.11 107,556 D Common Stock 10/01/2024 M 65,250 A $ 0 172,806 D Common Stock 10/01/2024 F( 2 ) 25,677 D $ 7.11 147,129 D Common Stock 10/01/2024 D 147,129 D 0 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 Restricted Stock Units [2022] ( 4 ) 10/01/2024 M 26,100 ( 5 ) ( 5 ) Common Stock 26,100 ( 5 ) 0 D Performance Stock Units [2022] ( 4 ) 10/01/2024 M 39,150 ( 5 ) ( 5 ) Common Stock 39,150 ( 5 ) 0 D Restricted Stock Units [2023& 2024] ( 4 ) 10/01/2024 D 318,314 ( 6 ) ( 6 ) Common Stock 318,314 $ 0 0 D Performance Stock Units [2023] ( 4 ) 10/01/2024 D 94,456 ( 7 ) ( 7 ) Common Stock 94,456 $ 0 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Lacy Christopher W 10000 ENERGY DRIVE SPRING, TX77389 See Remarks Signatures /s/ Christopher W. Lacy 10/01/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This transaction involved the reporting person's gift of 14,064 shares of common stock. ( 2 )Represents net share settlement of common stock award to satisfy withholding taxes. ( 3 )In connection with acquisition of Southwestern Energy Company (the "Issuer") by Expand Energy Corporation (formerly known as, Chesapeake Energy Corporation) ("Expand") on October 1, 2024 (the "Closing") the reported shares of Issuer common stock were converted into the right to receive 0.0867 (the "Exchange Ratio") of a share of Expand common stock, with cash in lieu of fractional shares. The closing price per share of Issuer common stock on the Nasdaq Global Select Market on September 30, 2024, the day prior to the Closing was $7.11. ( 4 )Each restricted stock unit ("Issuer RSU") or performance stock unit ("Issuer PSUs") represents a contingent right to receive a share of Issuer common stock upon vesting. ( 5 )The reported securities represent shares of Expand common stock received in connection with Closing upon accelerated vesting of the Issuer RSUs, Issuer PSUs. ( 6 )Upon Closing, the reported Issuer RSUs converted into restricted stock units that represent a contingent right to receive Expand common stock ("Expand RSUs") in an amount equal to the Exchange Ratio multiplied by the total number of shares of Issuer common stock subject to such Issuer RSU award, together with accrued dividend equivalent payments. Such Expand RSUs were granted subject to vesting conditions and settlement terms as applied under the applicable award agreements with respect to the corresponding Issuer RSUs. ( 7 )Upon Closing, the reported Issuer PSUs converted into Expand RSUs in an amount equal to the Exchange Ratio multiplied by the total number of shares of Issuer common stock subject to such Issuer PSU award, together with accrued dividend equivalent payments. Such Expand RSUs were granted subject to vesting conditions and settlement terms as applied under the applicable award agreements with respect to the corresponding Issuer PSUs.

Remarks: SVP, General Counsel and Corporate Secretary

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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