X0306 4 2022-12-31 0 0000092122 SOUTHERN CO SO 0001524757 Kuczynski Stephen E 30 IVAN ALLEN JR. BLVD., NW ATLANTA GA 30308 0 1 0 0 Pres. & CEO, Southern Nuclear Southern Company Common Stock 2022-12-31 4 M 0 9889 0.00 A 125173.1563 D Southern Company Common Stock 2022-12-31 4 F 0 4387 71.41 D 120786.1563 D Southern Co Restricted Stock Units 0.00 2022-12-31 4 M 0 8184 0.00 D Southern Company Common Stock 8184 0 D The RSU award, granted on May 23, 2018, vests 20% each year for five years, on December 31 of each year, beginning December 31, 2018. Includes 1,705 accrued dividend equivalent units. Shares will be withheld upon vesting to satisfy tax requirements. Shares withheld to satisfy required state and federal tax withholding requirements. The RSU award, granted on May 23, 2018, vests 20% each year for five years, on December 31 of each year, beginning December 31, 2018. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirement /s/ Marcia R. DeMar, Attorney-in-Fact for Stephen E. Kuczynski 2023-01-03