X0508 4 2026-02-05 0000092122 SOUTHERN CO SO 0001616250 Poroch David P. 30 IVAN ALLEN JR BLVD NW ATLANTA GA 30308 false true false false EVP & CFO false Southern Company Common Stock 2026-02-05 4 M false 585 0 A 41489 D Southern Company Common Stock 2026-02-05 4 F false 160 91.08 D 41329 D Southern Company Common Stock 5477.2898 I 401(k) Southern Co Restricted Stock Units 0 2026-02-05 4 M false 566 0 D Southern Company Common Stock 566 1130 D Shares acquired upon vesting of first 1/3 of restricted stock units granted on February 5, 2025. Includes 19 accrued dividend equivalent units. Shares withheld to satisfy required state and federal tax withholding requirements. Represents first 1/3 of 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 David P. Poroch 2026-02-09