X0306 4 2022-02-11 0 0000092122 SOUTHERN CO SO 0001354912 Daiss Ann P 30 IVAN ALLEN JR. BLVD., NW ATLANTA GA 30308 0 1 0 0 Comptroller Southern Company Common Stock 2022-02-11 4 M 0 912 0.00 A 14434.028 D Southern Company Common Stock 2022-02-11 4 F 0 449 66.79 D 13985.028 D Southern Company Common Stock 2022-02-11 4 M 0 647 0.00 A 14632.028 D Southern Company Common Stock 2022-02-11 4 F 0 289 66.79 D 14343.028 D Southern Company Common Stock 4775.7793 I 401K Southern Co Restricted Stock Units 0.00 2022-02-11 4 M 0 803 0.00 D Southern Company Common Stock 803 0 D Southern Co Restricted Stock Units 0.00 2022-02-11 4 M 0 595 0.00 D Southern Company Common Stock 595 596 D Shares acquired upon vesting of final 1/3 of restricted stock units granted on February 11, 2019. Includes 109 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 52 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 Ann P. Daiss 2022-02-14