X0508 4 2024-02-13 0 0000092122 SOUTHERN CO SO 0001815666 Peoples James Jeffrey 30 IVAN ALLEN JR BLVD NW ATLANTA GA 30308 0 1 0 0 Chairman, President & CEO, APC 0 Southern Company Common Stock 2024-02-13 4 M 0 820 0.00 A 19077 D Southern Company Common Stock 2024-02-13 4 F 0 365 67.51 D 18712 D Southern Company Common Stock 7567.7143 I 401K Southern Co Restricted Stock Units 0.00 2024-02-13 4 M 0 758 0.00 D Southern Company Common Stock 758 758 D Shares acquired upon vesting of second 1/3 of restricted stock units granted on February 13, 2022. Includes 62 accrued dividend equivalent units. Shares withheld to satisfy required state and federal tax withholding requirements. Represents second 1/3 of restricted stock units granted on February 13, 2022. The remaining 1/3 of the award will vest in 2025. 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 James J. Peoples 2024-02-14