X0508 4 2026-01-31 0000092122 SOUTHERN CO SO 0001697382 Cherry Pedro P. 30 IVAN ALLEN JR. BLVD., NW ATLANTA GA 30308 false true false false Chairman, President & CEO, MPC false Southern Company Common Stock 2026-01-31 4 M false 745 0 A 745 D Southern Company Common Stock 2026-01-31 4 F false 306 89.31 D 439 D Southern Company Common Stock 2026-02-01 4 M false 751 0 A 1190 D Southern Company Common Stock 2026-02-01 4 F false 366 89.31 D 824 D Southern Company Common Stock 15289.923 I 401(k) Southern Co Restricted Stock Units 0 2026-01-31 4 M false 695 0 D Southern Company Common Stock 695 696 D Southern Co Restricted Stock Units 0 2026-02-01 4 M false 672 0 D Southern Company Common Stock 672 0 D Shares acquired upon vesting of second 1/3 of restricted stock units granted on January 31, 2024. Includes 50 accrued dividend equivalent units. Shares withheld to satisfy required state and federal tax withholding requirements. Shares acquired upon vesting of final 1/3 of performance restricted stock units granted on February 1, 2023. Includes 79 accrued dividend equivalent units. Represents second 1/3 of restricted stock units granted on January 31, 2024. The remaining award will vest in 2027. Each restricted stock unit represents the right to receive, at settlement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements. Represents final 1/3 of performance restricted stock units granted on February 1, 2023. Each restricted stock unit represents the right to receive, at settlement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements. /s/ Brittney Anderson, Attorney-in-Fact for Pedro P. Cherry 2026-02-03