X0508 4 2024-02-03 0 0000092122 SOUTHERN CO SO 0001674959 DAVIS MARTIN BERNARD 30 IVAN ALLEN JR BLVD NW ATLANTA GA 30308 0 1 0 0 EVP and CIO 0 Southern Company Common Stock 2024-02-03 4 M 0 1929 0.00 A 74685 D Southern Company Common Stock 2024-02-03 4 F 0 959 68.65 D 73726 D Performance Restricted Stock Units 0.00 2024-02-03 4 M 0 1713 0.00 D Southern Company Common Stock 1713 0 D Shares acquired upon vesting of final 1/3 of performance restricted stock units granted on February 3, 2021. Includes 216 accrued dividend equivalent units. Shares withheld to satisfy required state and federal tax withholding requirements. Represents final 1/3 of performance restricted stock units granted on February 3, 2021. 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 Martin B. Davis 2024-02-06