Haynesville Core Operations and ESG Overview

Responsibly Sourced Gas to Premium Markets swn Southwestern Energy® 2023E Natural Gas Differential to NYMEX Canada: 1% Transportation (1) Location (2) Total Year Average Rate per Mcf Average Basis Average Differential per Mcf per Mcf Appalachia ($0.42) ($0.40) ($0.82) Haynesville ($0.04) ($0.31) ($0.35) Total Company ($0.24) ($0.36) ($0.60) Mid-West: 2% 2023E Sales Point Exposure Appalachia Haynesville Sales Location % Gross Marketed Production (3) % Gross Sales Location Marketed Production (3) Out of Basin NYMEX 54% NYMEX / Gulf Coast 25% Perryville TGT Z1 - 34% TETCO M3 14% Industrials FGT Z3 5% TGP 200L 5% Other TGP ZO 7% 12% Other (4) In Basin DOM / M2 TCO Pool 28% 16% Greater Appalachia: 26% LNG Corridor / Gulf Coast: 65% City Gate: 6% 1) Rate per Mcf based on estimated 2023 production and February 2023 contracted takeaway and firm sales. Estimates for natural gas differentials include all commitment costs. 2) Basis as of February 2023. Includes basis differentials, transportation variable cost, physical basis sales, third-party transportation charges and fuel charges, and excludes financial basis derivatives. 3) Based on midpoint of guidance. 4) Other includes REX, TCO East, Dawn, Transco Z5 S and TGP Z6 S. NOTE: Percentages on map approximate 2023 sales by location based on estimated marketed production, firm transportation and firm sales. 17

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