X0508 4 2024-02-06 0 0000092122 SOUTHERN CO SO 0001616250 Poroch David P. 30 IVAN ALLEN JR BLVD NW ATLANTA GA 30308 0 1 0 0 Comptroller 0 Southern Co Restricted Stock Units 0.00 2024-02-06 4 A 0 2028 0.00 A Southern Company Common Stock 2028 2028 D Restricted stock units are payable in Southern Company common stock and vest 1/3 per year on the first, second and third anniversary of grant date. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements. The grant was approved by the Compensation and Talent Development Committee on January 31, 2024 and fixed and determinable on February 6, 2024. /s/ Myra C. Bierria, Attorney-in-Fact for David P. Poroch 2024-02-08