Initial Statement of Beneficial Ownership (Form 3)

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * Kim Matthew M. 2. Date of Event Requiring Statement (Month/Day/Year) 07/31/2025 3. Issuer Name and Ticker or Trading Symbol SOUTHERN CO [SO] (Last) (First) (Middle) 30 IVAN ALLEN JR. BLVD., NW 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Comptroller 5. If Amendment, Date Original Filed (Month/Day/Year) (Street) ATLANTA, GA 30308 6. Individual or Joint/Group Filing (Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Southern Company Common Stock 9,009 D Southern Company Common Stock 2,803.97 I 401(k)

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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Southern Co Restricted Stock Units(1)	(1)	(1)	Southern Company Common Stock	635	$0	D
Southern Co Restricted Stock Units(2)	(2)	(2)	Southern Company Common Stock	308	$0	D
Phantom Stock Units(3)	(3)	(3)	Southern Company Common Stock	366.75	$0	D
Southern Co Restricted Stock Units(4)	(4)	(4)	Southern Company Common Stock	844	$0	D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Kim Matthew M. 30 IVAN ALLEN JR. BLVD., NW ATLANTA, GA 30308			Comptroller

Signatures

/s/ Brittney Anderson, Attorney-in-Fact for Matthew M. Kim		08/22/2025
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	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.
(2)	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.
(3)	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.
(4)	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.

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