SOUTHERN CO (SO) · Insider Trading (Form 4) SEC Filing

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-05-24 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: SOUTHERN CO (SO) CIK: 0000092122 --- Reporting Owner --- Name: WOMACK CHRISTOPHER C CIK: 0001195423 Role: Officer (Chairman, President & CEO) --- Non-Derivative Transactions --- [Transaction #1] Security: Southern Company Common Stock Date: 2026-05-24 | Code: M (Exercise of derivative) Shares: +7,662 | Price: $0.00 Shares Owned After: 216,863.2496 | Ownership: D (Direct) Footnotes: [F1] Shares acquired upon vesting of the final 1/3 of performance restricted stock units granted on May 24, 2023. Includes 764 accrued dividend equivalent units. [Transaction #2] Security: Southern Company Common Stock Date: 2026-05-24 | Code: F (Payment of exercise/tax) Shares: -3,414 | Price: $94.55 Total Value: $322,793.70 Shares Owned After: 213,449.2496 | Ownership: D (Direct) Footnotes: [F2] Shares withheld to satisfy required state and federal tax withholding requirements. --- Derivative Transactions --- [Transaction #1] Security: Performance Restricted Stock Units Date: 2026-05-24 | Code: M (Exercise of derivative) Shares: -6,898 | Price: $94.55 Shares Owned After: 0 | Ownership: D (Direct) Footnotes: [F3] Represents the final 1/3 of performance restricted stock units granted on May 24, 2023. [F3] Represents the final 1/3 of performance restricted stock units granted on May 24, 2023. [F3] Represents the final 1/3 of performance restricted stock units granted on May 24, 2023. [F3] Represents the final 1/3 of performance restricted stock units granted on May 24, 2023. --- Holdings --- [Holding #1] Security: Southern Company Common Stock Ownership: I (Indirect) --- Footnotes (Complete Index) --- F1: Shares acquired upon vesting of the final 1/3 of performance restricted stock units granted on May 24, 2023. Includes 764 accrued dividend equivalent units. F2: Shares withheld to satisfy required state and federal tax withholding requirements. F3: Represents the final 1/3 of performance restricted stock units granted on May 24, 2023. --- Signature --- /s/ /s/ Brittney Anderson, Attorney-in-Fact for Christopher C. Womack (2026-05-26)