X0306 4 2022-02-11 0 0000092122 SOUTHERN CO SO 0001573512 Greene Kimberly S, 30 IVAN ALLEN JR. BLVD ATLANTA GA 30308 0 1 0 0 Chairman, President & CEO, GAS Southern Company Common Stock 2022-02-11 4 M 0 4143 0.00 A 89912 D Southern Company Common Stock 2022-02-11 4 F 0 1916 66.79 D 87996 D Southern Company Common Stock 2022-02-11 4 M 0 2939 0.00 A 90935 D Southern Company Common Stock 2022-02-11 4 F 0 1334 66.79 D 89601 D Performance Restricted Stock Units 0.00 2022-02-11 4 M 0 3650 0.00 D Southern Company Common Stock 3650 0 D Performance Restricted Stock Units 0.00 2022-02-11 4 M 0 2705 0.00 D Southern Company Common Stock 2705 2706 D Shares acquired upon vesting of final 1/3 of performance restricted stock units granted on February 11, 2019. Includes 493 accrued dividend equivalent units. Shares withheld to satisfy required state and federal tax withholding requirements. Shares acquired upon vesting of second 1/3 of performance restricted stock units granted on February 11, 2020. Includes 234 accrued dividend equivalent units. Represents final 1/3 of performance restricted stock units granted on February 11, 2019. 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 second 1/3 of performance restricted stock units granted on February 11, 2020. The remaining 1/3 of the award will vest in 2023. Each performance 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/ Marcia R. DeMar, Attorney-in-Fact for Kimberly S. Greene 2022-02-14