X0306 4 2022-02-13 0 0000092122 SOUTHERN CO SO 0001195423 WOMACK CHRISTOPHER C 30 IVAN ALLEN JR. BLVD., NW ATLANTA GA 30308 0 1 0 0 President, GPC Southern Company Common Stock 2022-02-13 4 M 0 4096 0.00 A 31275.6706 D Southern Company Common Stock 2022-02-13 4 F 0 1858 66.79 D 29417.6706 D Southern Company Common Stock 2022-02-13 4 A 0 37799 0.00 A 67216.6706 D Southern Company Common Stock 2022-02-13 4 F 0 17143 66.79 D 50073.6706 D Southern Company Common Stock 2237.1801 I 401K Performance Restricted Stock Units 0.00 2022-02-13 4 M 0 3931 0.00 D Southern Company Common Stock 3931 7861 D Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on February 3, 2021. The Compensation Committee and Management Succession Committee certified performance on February 13, 2022. Includes 165 accrued dividend equivalent units. Shares withheld to satisfy required state and federal tax withholding requirements. Shares acquired upon vesting of performance share units under Company's Performance Share Program for the 2019-2021 award. The Compensation and Management Succession Committee certified performance on February 13, 2022. Includes accrued dividend equivalent units. Represents first 1/3 of performance restricted stock units granted on February 3, 2021. The remaining award will vest 1/3 in 2023 and 1/3 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 Christopher C. Womack 2022-02-15