Peter P. Sena III - 11 Feb 2026 Form 4 Insider Report for SOUTHERN CO (SO)

Role
Chairman,President & CEO, SNC
Signature
/s/ Brittney Anderson, Attorney-in-Fact for Peter P. Sena, III
Issuer symbol
SO
Transactions as of
11 Feb 2026
Net transactions value
-$1,007,910
Form type
4
Filing time
13 Feb 2026, 15:51:39 UTC
Previous filing
03 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Sena Peter P III Chairman,President & CEO, SNC 30 IVAN ALLEN JR. BLVD NW, BIN SC 803, ATLANTA /s/ Brittney Anderson, Attorney-in-Fact for Peter P. Sena, III 13 Feb 2026 0002023851

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction SO Southern Company Common Stock Award $0 +22,698 +134% $0.000000 39,587 11 Feb 2026 Direct F1
transaction SO Southern Company Common Stock Tax liability $914,688 -10,067 -25% $90.86 29,520 11 Feb 2026 Direct F2
transaction SO Southern Company Common Stock Options Exercise $0 +2,311 +7.8% $0.000000 31,831 11 Feb 2026 Direct F3
transaction SO Southern Company Common Stock Tax liability $93,222 -1,026 -3.2% $90.86 30,805 11 Feb 2026 Direct F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction SO Performance Restricted Stock Units Options Exercise $0 -2,235 -33% $0.000000 4,469 11 Feb 2026 Southern Company Common Stock 2,235 $0.000000 Direct F4
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
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 76 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.