Southern Company (SO) comptroller sells 5,123 shares in open-market trade

Rhea-AI Filing Summary

Southern Company Comptroller Matthew M. Kim reported an open-market sale of Southern Company common stock. He sold 5,123 shares at a price of $95.15 per share, leaving him with 6,888 shares of direct ownership. In addition, he reported indirect ownership of 1,203.0238 shares held through a 401(k) plan, reflecting his retirement-plan holdings rather than a new trade.

Insider Trade Summary

Net Seller: 5,123 shares ($487,453)

Net Sell 2 txns

Insider Kim Matthew M.

Role Comptroller

Sold 5,123 shs ($487K)

Type	Security	Shares	Price	Value
Sale	Southern Company Common Stock	5,123	$95.15	$487K
holding	Southern Company Common Stock	--	--	--

Holdings After Transaction: Southern Company Common Stock — 6,888 shares (Direct); Southern Company Common Stock — 1,203.024 shares (Indirect, 401(k))

Footnotes (1)

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Kim Matthew M.

(Last) (First) (Middle)

30 IVAN ALLEN JR. BLVD., NW

(Street)

ATLANTA GA 30308

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
SOUTHERN CO [ SO ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Comptroller

3. Date of Earliest Transaction (Month/Day/Year)
02/24/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Southern Company Common Stock	02/24/2026		S		5,123	D	$95.15	6,888	D
Southern Company Common Stock								1,203.0238	I	401(k)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

	/s/ Brittney Anderson, Attorney-in-Fact for Matthew M. Kim	02/25/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transaction did Southern Company (SO) report for Matthew M. Kim?

Southern Company Comptroller Matthew M. Kim reported selling 5,123 shares of Southern Company common stock. The shares were sold in an open-market transaction at $95.15 per share, according to the Form 4 insider trading report.

At what price did Matthew M. Kim sell Southern Company (SO) shares?

Matthew M. Kim sold Southern Company common stock at $95.15 per share. This price applies to the 5,123 shares reported as sold in the open-market transaction on the Form 4 filing for Southern Company.

How many Southern Company (SO) shares does Matthew M. Kim own after the sale?

After the reported sale, Matthew M. Kim directly owns 6,888 shares of Southern Company common stock. He also has indirect ownership of 1,203.0238 shares through a 401(k) plan, as disclosed in the Form 4 filing.

What role does Matthew M. Kim hold at Southern Company (SO)?

Matthew M. Kim serves as Comptroller at Southern Company. His position as an officer makes his equity transactions subject to Form 4 reporting requirements, which disclose his trading activity in Southern Company common stock.

Does Matthew M. Kim have indirect Southern Company (SO) holdings?

Yes. In addition to directly held shares, Matthew M. Kim reported indirect ownership of 1,203.0238 Southern Company shares. These are held through a 401(k) plan, indicating retirement-plan holdings separate from his directly owned stock.