X0306 4 2023-02-03 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 2023-02-03 4 M 0 531 0.00 A 34149 D Southern Company Common Stock 2023-02-03 4 F 0 269 67.27 D 33880 D Southern Company Common Stock 3234.4907 I 401(K) Southern Company Common Stock 745.5726 I By Wife's 401(K) Southern Co Restricted Stock Units 0.00 2023-02-03 4 M 0 491 0.00 D Southern Company Common Stock 491 492 D Shares acquired upon vesting of second 1/3 of restricted stock units granted on February 3, 2021. Includes 40 accrued dividend equivalent units. Shares withheld to satisfy required state and federal tax withholding requirements. Represents restricted stock units granted on February 3, 2021. The remaining 1/3 of the award will vest in 2024. 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 2023-02-07