Cummiskey Christopher 4

4 · SOUTHERN CO · Filed Feb 13, 2026

AI-generated summary of this filing

Updated Feb 13, 2026

Southern Co (SO) EVP Christopher Cummiskey Receives Awards, Sells Shares

What Happened

Christopher Cummiskey, EVP of Southern Co (SO), received shares upon vesting of performance/share and restricted stock units on Feb 11, 2026. He was credited 22,178 shares from the 2023–2025 performance share award and 1,490 shares from the first 1/3 vesting of the Feb 5, 2025 restricted stock unit award.
To satisfy required tax withholding, a total of 10,618 shares were withheld (9,880 shares and 738 shares) valued at $90.86 per share, resulting in withholding amounts of $897,697 and $67,055 (total $964,752). The filings also show conversion/exercise entries (M) tied to the vesting/settlement of those awards.

Key Details

Transaction date: Feb 11, 2026; Form 4 filed Feb 13, 2026 (appears timely).
Grant/settlement: 22,178 shares (performance share units, 2023–2025) and 1,490 shares (first 1/3 of 2025 restricted stock units). Includes accrued dividend equivalent units (footnotes F1, F3).
Withholding/tax payments: 9,880 shares and 738 shares were withheld at $90.86 to satisfy federal/state tax withholding (footnote F2).
Additional derivative entry: a 1,441-share M-line appears in the filing associated with conversion/disposition of derivative units (see footnote F4 for RSU vesting schedule and settlement mechanics).
Shares owned after the transaction: not specified in the provided filing excerpt.
Footnotes: Committee certified performance on Feb 11, 2026; remaining RSU tranches vest in 2027 and 2028 (F1–F4).

Context

These actions are routine award settlements: performance share units and restricted stock units vested and were converted to common stock. The “disposals” reported are shares withheld to cover tax liabilities (a cashless/withholding settlement), not open-market sales signaling a directional bet.
Transaction codes: A = award/acquisition on vesting, M = exercise/conversion of derivative awards, F = shares withheld to satisfy tax obligations.

Form 4

Period: 2026-02-11

EVP

Transactions

Award
Southern Company Common Stock
[F1]
2026-02-11+22,178→ 46,597.442 total
Tax Payment
Southern Company Common Stock
[F2]
2026-02-11$90.86/sh−9,880$897,697→ 36,717.442 total
Exercise/Conversion
Southern Company Common Stock
[F3]
2026-02-11+1,490→ 38,207.442 total
Tax Payment
Southern Company Common Stock
[F2]
2026-02-11$90.86/sh−738$67,055→ 37,469.442 total
Exercise/Conversion
Performance Restricted Stock Units
[F4]
2026-02-11−1,441→ 2,880 total
Exercise: $0.00→ Southern Company Common Stock (1,441 underlying)

Holdings

Footnotes (4)

[F1]Shares acquired upon vesting of performance share units under Company's Performance Share Program for the 2023-2025 award. The Compensation and Talent Development Committee certified performance on February 11, 2026. Includes accrued dividend equivalent units.
[F2]Shares withheld to satisfy required state and federal tax withholding requirements.
[F3]Shares acquired upon vesting of first 1/3 of performance restricted stock units granted on February 5, 2025. The Compensation and Talent Development Committee certified performance on February 11, 2026. Includes 49 accrued dividend equivalent units.
[F4]Represents first 1/3 of performance restricted stock units granted on February 5, 2025. The remaining award will vest 1/3 in 2027 and 1/3 in 2028. Each restricted stock unit represents the right to receive, at settlement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

Signature

/s/ Brittney Anderson, Attorney-in-Fact for Christopher Cummiskey|2026-02-13

1 file