X0508 4 2024-02-21 0000007332 SOUTHWESTERN ENERGY CO SWN 0001848194 Gillenwater Carina L 10000 ENERGY DRIVE P. O. BOX 12359 SPRING TX 77391-2359 1 SVP, Human Resources and Admin 0 Common Stock 2024-02-21 4 M 0 15110 0 A 128507 D Common Stock 2024-02-21 4 F 0 3680 7.10 D 124827 D Common Stock 2024-02-22 4 M 0 14170 0 A 138997 D Common Stock 2024-02-22 4 F 0 3451 7.02 D 135546 D Restricted Stock Units 2024-02-21 4 A 0 97830 0 A Common Stock 97830 97830 D Restricted Stock Unit 2024-02-21 4 M 0 15110 0 D Common Stock 15110 30220 D Restricted Stock Unit 2024-02-22 4 M 0 14170 0 D Common Stock 14170 14170 D Each Restricted Stock Unit ("RSU") has the economic equivalent of one share of Southwestern Energy Company ("SWN") common stock. The RSUs vesting on February 21, 2024 and February 22, 2024 were settled in common stock based on the closing price of SWN common stock on the vesting date. Represents net share settlement of common stock award to satisfy withholding taxes. Each RSU represents a contingent right to receive one share of SWN common stock or an amount in cash equal to the Fair Market Value of one share of SWN common stock. On February 21, 2024 the reporting person was granted Restricted Stock Units (RSUs), vesting in three equal installments beginning on the first anniversary of the grant date, or immediately upon death, disability, retirement at age 65 with the required years of service, or a change in control. Vesting units will be settled in shares of SWN common stock, cash, or a combination of shares of SWN common stock and cash. On February 21, 2023, the reporting person was granted restricted stock units, vesting in three equal installments beginning on the first anniversary of the grant date, or immediately upon death, disability, retirement at age 65 with required years of service, or a change in control. Vesting units will be settled in shares of SWN common stock, cash, or a combination of shares of SWN common stock and cash. On February 22, 2022, the reporting person was granted restricted stock units, vesting in three equal installments beginning on the first anniversary of the grant date, or immediately upon death, disability, retirement at age 65 with required years of service, or a change in control. Vesting units will be settled in shares of SWN common stock, cash, or a combination of shares of SWN common stock and cash. /s/ Erik Norris, attorney-in-fact for Ms. Gillenwater 2024-02-23