X0206 3 2023-03-31 0 0000092122 SOUTHERN CO SO 0001971188 Drake Sloane N 30 IVAN ALLEN JR BLVD NW ATLANTA GA 30308 0 1 0 0 EVP, CHRO Southern Company Common Stock 20815 D Southern Company Common Stock 1660.7145 I 401K Southern Co Restricted Stock Units 0.00 Southern Company Common Stock 6628 D Southern Co Restricted Stock Units 0.00 Southern Company Common Stock 1272 D Southern Co Restricted Stock Units 0.00 Southern Company Common Stock 684 D Represents restricted stock units granted on February 6, 2023. The award will vest one-third per year on the first, second and third anniversary of grant date. Each restricted stock unit represents the right to receive, at settlement, one share of common stock. Represents restricted stock units granted on February 13, 2022. The remaining award will vest 1/3 in 2024 and 1/3 in 2025. Each restricted stock unit represents the right to receive, at settlement, one share of common stock. Represents restricted stock units granted on February 3, 2021. The remaining award will vest 1/3 in 2024. Each restricted stock unit represents the right to receive, at settlement, one share of common stock. /s/Marcia R. DeMar, Attorney-in-Fact for Sloane N. Drake 2023-04-03