Matthew M. Kim - 01 Apr 2026 Form 4 Insider Report for SOUTHERN CO (SO)

Reporting relationship: Comptroller
Issuer ticker: SO
Reported as of: 01 Apr 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 02 Apr 2026, 16:30:15 UTC
Prior SEC filing: 25 Feb 2026
Next SEC filing: 04 May 2026
Source filing: View source filing
Reporting owner signature: /s/ Brittney Anderson, Attorney-in-Fact for Matthew M. Kim

Key filing fact

Matthew M. Kim filed Form 4 for SOUTHERN CO (SO) on 02 Apr 2026.

Key facts

This page summarizes Matthew M. Kim's Form 4 filing for SOUTHERN CO (SO).
5 reported transactions and 3 derivative rows are listed below.
Accepted by SEC: 02 Apr 2026, 16:30.

Change

Previous filing in this sequence was filed on 25 Feb 2026.
Current net transaction value: $0.

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 0002082705 Primary reporting owner

Kim Matthew M.

Relationship: Comptroller
Address: 30 IVAN ALLEN JR. BLVD., NW, ATLANTA
Signature: /s/ Brittney Anderson, Attorney-in-Fact for Matthew M. Kim
Signature date: 02 Apr 2026

Reported non-derivative transactions

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

SO transaction

Southern Company Common Stock

Options Exercise

Transaction value
Shares: +82
Change %: +1.2%
Price: $0.000000^*
Shares after: 6,970
Date: 01 Apr 2026
Ownership: Direct
Footnotes: F1

SO transaction

Southern Company Common Stock

Tax liability

Transaction value
Shares: -82
Change %: -1.2%
Price: $96.94^*
Shares after: 6,888
Date: 01 Apr 2026
Ownership: Direct
Footnotes: F2

Reported derivative securities

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

SO transaction Derivative

Southern Co Restricted Stock Units

Options Exercise

Transaction value
Shares: -13
Change %: -4.1%
Price: $0.000000^*
Shares after: 305
Date: 01 Apr 2026
Ownership: Direct
Underlying class: Southern Company Common Stock
Underlying amount: 13
Exercise price: $0.000000
Footnotes: F3

SO transaction Derivative

Southern Co Restricted Stock Units

Options Exercise

Transaction value
Shares: -23
Change %: -4.1%
Price: $0.000000^*
Shares after: 539
Date: 01 Apr 2026
Ownership: Direct
Underlying class: Southern Company Common Stock
Underlying amount: 23
Exercise price: $0.000000
Footnotes: F4

SO transaction Derivative

Performance Restricted Stock Units

Options Exercise

Transaction value
Shares: -42
Change %: -4.1%
Price: $0.000000^*
Shares after: 975
Date: 01 Apr 2026
Ownership: Direct
Underlying class: Southern Company Common Stock
Underlying amount: 42
Exercise price: $0.000000
Footnotes: F5

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote F1

Represents shares delivered to the Company to cover FICA withholding obligations due because Reporting Person is retirement eligible pursuant to his applicable stock grant documents. Includes 4 accrued dividend equivalent units.

Footnote F2

Represents shares delivered to the Company to cover FICA withholding obligations due because Reporting Person is retirement eligible pursuant to his applicable stock grant documents.

Footnote F3

Represents restricted stock units granted on January 31, 2024, payable in Southern Company common stock and will continue to vest on the third anniversary of the grant date. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy income tax requirements.

Footnote F4

Represents restricted stock units granted on February 5, 2025, payable in Southern Company common stock and will continue to vest on the remaining second and third anniversary of the grant date. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy income tax requirements.

Footnote F5

Represents restricted stock units granted on February 11, 2026, payable in Southern Company common stock and vest every year on the first, second and third anniversary of the grant date. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy income tax requirements.