X0508 4 2024-02-03 0 0000092122 SOUTHERN CO SO 0001195423 WOMACK CHRISTOPHER C 30 IVAN ALLEN JR. BLVD., NW ATLANTA GA 30308 0 1 0 0 CEO, President and Chairman 0 Southern Company Common Stock 2024-02-03 4 M 0 4426 0.00 A 49289.5176 D Southern Company Common Stock 2024-02-03 4 F 0 2033 68.65 D 47256.5176 D Southern Company Common Stock 2412.0101 I 401K Performance Restricted Stock Units 0.00 2024-02-03 4 M 0 3931 0.00 D Southern Company Common Stock 3931 0 D Shares acquired upon vesting of final 1/3 of performance restricted stock units granted on February 3, 2021. Includes 495 accrued dividend equivalent units. Shares withheld to satisfy required state and federal tax withholding requirements. Represents final 1/3 of performance restricted stock units granted on February 3, 2021. 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/ Myra C. Bierria, Attorney-in-Fact for Christopher C. Womack 2024-02-06