X0306 4 2022-02-11 0 0000092122 SOUTHERN CO SO 0001881495 Tucker Daniel S 30 IVAN ALLEN JR BLVD NW ATLANTA GA 30308 0 1 0 0 Executive Vice President & CFO Southern Company Common Stock 2022-02-11 4 M 0 593 0.00 A 28954 D Southern Company Common Stock 2022-02-11 4 F 0 284 66.79 D 28670 D Southern Company Common Stock 2022-02-11 4 M 0 424 0.00 A 29094 D Southern Company Common Stock 2022-02-11 4 F 0 181 66.79 D 28913 D Southern Company Common Stock 3112.1583 I 401(K) Southern Company Common Stock 716.2351 I By Wife's 401(K) Southern Co Restricted Stock Units 0.00 2022-02-11 4 M 0 523 0.00 D Southern Company Common Stock 523 0 D Southern Co Restricted Stock Units 0.00 2022-02-11 4 M 0 390 0.00 D Southern Company Common Stock 390 390 D Shares acquired upon vesting of final 1/3 of restricted stock units granted on February 11, 2019. Includes 70 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 34 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 Daniel S. Tucker 2022-02-14