X0306 4 2022-02-11 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 Southern Company Common Stock 2022-02-11 4 M 0 1627 0.00 A 29716 D Southern Company Common Stock 2022-02-11 4 F 0 797 66.79 D 28919 D Southern Company Common Stock 2022-02-11 4 M 0 1151 0.00 A 30070 D Southern Company Common Stock 2022-02-11 4 F 0 520 66.79 D 29550 D Southern Co Restricted Stock Units 0.00 2022-02-11 4 M 0 1433 0.00 D Southern Company Common Stock 1433 0 D Southern Co Restricted Stock Units 0.00 2022-02-11 4 M 0 1059 0.00 D Southern Company Common Stock 1059 1060 D Shares acquired upon vesting of final 1/3 of restricted stock units granted on February 11, 2019. Includes 194 accrued dividend equivalent units. Shares withheld to satisfy required state and federal tax withholding requirements. Shares acquired upon vesting of second 1/3 of restricted stock units granted on February 11, 2020. Includes 92 accrued dividend equivalent units. Represents final 1/3 of 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 restricted stock units granted on February 11, 2020. The remaining 1/3 of the award will vest in 2023. 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/ Marcia R. DeMar, Attorney-in-Fact for Martin B. Davis 2022-02-14