X0508 4 2024-02-13 0 0000092122 SOUTHERN CO SO 0001498337 Connally Stan W 30 IVAN ALLEN JR. BLVD ATLANTA GA 30308 0 1 0 0 Executive Vice President, SCS 0 Southern Company Common Stock 2024-02-13 4 M 0 2334 0.00 A 141425 D Southern Company Common Stock 2024-02-13 4 F 0 1036 67.51 D 140389 D Performance Restricted Stock Units 0.00 2024-02-13 4 M 0 2161 0.00 D Southern Company Common Stock 2161 2161 D Shares acquired upon vesting of second 1/3 of performance restricted stock units granted on February 13, 2022. Includes 173 accrued dividend equivalent units. Shares withheld to satisfy required state and federal tax withholding requirements. Represents second 1/3 of performance restricted stock units granted on February 13, 2022. The remaining 1/3 of the award will vest in 2025. 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/ Myra C. Bierria, Attorney-in-Fact for Stan W. Connally 2024-02-14