Matthew M. Kim - 31 Jul 2025 Form 3 Insider Report for SOUTHERN CO (SO)

Role
Comptroller
Signature
/s/ Brittney Anderson, Attorney-in-Fact for Matthew M. Kim
Issuer symbol
SO
Transactions as of
31 Jul 2025
Net transactions value
$0
Form type
3
Filing time
22 Aug 2025, 12:00:04 UTC
Next filing
03 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Kim Matthew M. Comptroller 30 IVAN ALLEN JR. BLVD., NW, ATLANTA /s/ Brittney Anderson, Attorney-in-Fact for Matthew M. Kim 22 Aug 2025 0002082705

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
holding SO Southern Company Common Stock 9,009 31 Jul 2025 Direct
holding SO Southern Company Common Stock 2,804 31 Jul 2025 401(k)

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
holding SO Southern Co Restricted Stock Units 31 Jul 2025 Southern Company Common Stock 635 $0.000000 Direct F1
holding SO Southern Co Restricted Stock Units 31 Jul 2025 Southern Company Common Stock 308 $0.000000 Direct F2
holding SO Phantom Stock Units 31 Jul 2025 Southern Company Common Stock 367 $0.000000 Direct F3
holding SO Southern Co Restricted Stock Units 31 Jul 2025 Southern Company Common Stock 844 $0.000000 Direct F4
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Represents Restricted Stock Units granted on January 31, 2024. The award vested 1/3 on the first anniversary of the grant date. The remaining award will vest 1/3 in 2026 and 1/3 in 2027. Each restricted stock unit represents the right to receive, at settlement, one share of common stock.
F2 Represents Restricted Stock Units granted on February 1, 2023. The award vested 1/3 on each of the first and second anniversaries of the grant date. The remaining award will vest in 2026. Each restricted stock unit represents the right to receive, at settlement, one share of common stock.
F3 Acquired on various dates between January 5, 2018 and March 1, 2024 pursuant to the Southern Company Deferred Compensation Plan, at prices ranging from $43.28 to $79.52 per unit, and the dividend reinvestment feature of the plan payable in cash only upon termination.
F4 Represents Restricted Stock Units granted on February 5, 2025. The award will vest 1/3 per year on the first, second and third anniversaries of grant date. Each restricted stock unit represents the right to receive, at settlement, one share of common stock.