X0508 4 2026-02-11 0000092122 SOUTHERN CO SO 0001642170 Cummiskey Christopher 30 IVAN ALLEN JR BLVD NW ATLANTA GA 30308 false true false false EVP false Southern Company Common Stock 2026-02-11 4 A false 22178 0 A 46597.4417 D Southern Company Common Stock 2026-02-11 4 F false 9880 90.86 D 36717.4417 D Southern Company Common Stock 2026-02-11 4 M false 1490 0 A 38207.4417 D Southern Company Common Stock 2026-02-11 4 F false 738 90.86 D 37469.4417 D Southern Company Common Stock 5857.0111 I 401(k) Performance Restricted Stock Units 0 2026-02-11 4 M false 1441 0 D Southern Company Common Stock 1441 2880 D Shares acquired upon vesting of performance share units under Company's Performance Share Program for the 2023-2025 award. The Compensation and Talent Development Committee certified performance on February 11, 2026. Includes accrued dividend equivalent units. Shares withheld to satisfy required state and federal tax withholding requirements. Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on February 5, 2025. The Compensation and Talent Development Committee certified performance on February 11, 2026. Includes 49 accrued dividend equivalent units. Represents first 1/3 of performance restricted stock units granted on February 5, 2025. The remaining award will vest 1/3 in 2027 and 1/3 in 2028. 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 Christopher Cummiskey 2026-02-13