Christopher Cummiskey - 11 Feb 2026 Form 4 Insider Report for SOUTHERN CO (SO)

Reporting relationship: EVP
Issuer ticker: SO
Reported as of: 11 Feb 2026
Net transaction value: -$964,751
SEC form: 4
Accepted by SEC: 13 Feb 2026, 15:50:05 UTC
Prior SEC filing: 03 Feb 2026
Next SEC filing: 19 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Brittney Anderson, Attorney-in-Fact for Christopher Cummiskey

Key filing fact

Christopher Cummiskey filed Form 4 for SOUTHERN CO (SO) on 13 Feb 2026.

Key facts

This page summarizes Christopher Cummiskey's Form 4 filing for SOUTHERN CO (SO).
5 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 13 Feb 2026, 15:50.

Change

Previous filing in this sequence was filed on 03 Feb 2026.
Current net transaction value: -$964,751.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001642170 Primary reporting owner

Cummiskey Christopher

Relationship: EVP
Address: 30 IVAN ALLEN JR BLVD NW, ATLANTA
Signature: /s/ Brittney Anderson, Attorney-in-Fact for Christopher Cummiskey
Signature date: 13 Feb 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

SO transaction

Southern Company Common Stock

Award

Transaction value: $0
Shares: +22,178
Change %: +91%
Price: $0.000000
Shares after: 46,597
Date: 11 Feb 2026
Ownership: Direct
Footnotes: F1

SO transaction

Southern Company Common Stock

Tax liability

Transaction value: $897,697
Shares: -9,880
Change %: -21%
Price: $90.86
Shares after: 36,717
Date: 11 Feb 2026
Ownership: Direct
Footnotes: F2

SO transaction

Southern Company Common Stock

Options Exercise

Transaction value: $0
Shares: +1,490
Change %: +4.1%
Price: $0.000000
Shares after: 38,207
Date: 11 Feb 2026
Ownership: Direct
Footnotes: F3

SO transaction

Southern Company Common Stock

Tax liability

Transaction value: $67,055
Shares: -738
Change %: -1.9%
Price: $90.86
Shares after: 37,469
Date: 11 Feb 2026
Ownership: Direct
Footnotes: F2

SO holding

Southern Company Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 5,857
Date: 11 Feb 2026
Ownership: 401(k)

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

SO transaction Derivative

Performance Restricted Stock Units

Options Exercise

Transaction value: $0
Shares: -1,441
Change %: -33%
Price: $0.000000
Shares after: 2,880
Date: 11 Feb 2026
Ownership: Direct
Underlying class: Southern Company Common Stock
Underlying amount: 1,441
Exercise price: $0.000000
Footnotes: F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote 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.

Footnote F2

Shares withheld to satisfy required state and federal tax withholding requirements.

Footnote 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.

Footnote 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.