Kim Matthew M. 4

What Happened

• Matthew M. Kim, Comptroller of Southern Co (SO), received 4,450 shares upon vesting of performance share units under the company’s 2023–2025 Performance Share Program (awarded 2026-02-11; share price for the award recorded as $0.00 since these were vested awards). To satisfy tax withholding, 2,014 shares were withheld/disposed at $90.86 per share, totaling $182,992. The Compensation and Talent Development Committee certified performance on February 11, 2026; the award includes accrued dividend equivalent units.

Key Details

• Transaction dates: February 11, 2026 (award vesting and tax withholding); Form 4 filed February 13, 2026 (timely filing).
• Award: 4,450 shares issued upon PSU vesting (code A); withholding: 2,014 shares withheld for taxes at $90.86/share (code F) — $182,992 withheld value.
• Shares owned after transaction: not specified in this filing.
• Footnotes: F1 = vesting of 2023–2025 Performance Share Program, includes dividend equivalents; F2 = shares withheld to satisfy state and federal tax withholding.
• Filing timeliness: filing appears timely (submitted within two business days of the report date).

Context

• This was an issuance/vesting of performance-based restricted shares rather than an open-market purchase or executive sale; shares withheld for taxes is a routine administrative step (cashless withholding) and not the same as an intentional sale of additional shares. Performance share vesting reflects prior compensation awards and committee performance certification rather than a market-timed trade.