144 0001498337 XXXXXXXX LIVE 0000092122 Southern Company 001-03526 30 Ivan Allen Jr. Boulevard, N.W. Atlanta GA 30308 404-506-5000 Stanley Connally Officer Common Merrill Lynch

3455 Peachtree Road NE, Suite 1000 Atlanta GA 30326

12500 1221625 1119391291 03/18/2026 NYSE Common 02/05/2025 RESTRICTED STOCK UNIT VEST Southern Company N 1249 02/05/2025 COMPENSATORY PAYMENT Common 02/05/2025 RESTRICTED STOCK UNIT VEST Southern Company N 52 02/05/2025 COMPENSATORY PAYMENT Common 02/05/2025 PERFORMANCE STOCK UNIT VEST Southern Company N 9853 02/05/2025 Compensatory Payment Common 02/13/2025 RESTRICTED STOCK UNIT VEST Southern Company N 1202 02/13/2025 Compensatory Payment Common 02/13/2025 RESTRICTED STOCK UNIT VEST Southern Company N 144 02/13/2025 Compensatory Payment Y 03/18/2026 11/17/2025 Stanley Connally