Southern Company comptroller sells 100 shares

Southern Company reported that Comptroller Matthew M. Kim sold 100 shares of Southern Company Common Stock on 2026-08-03 at $94.28 per share in an open market or private transaction pursuant to a Rule 10b5-1 trading plan.

Accepted by SEC EDGAR 08/04/2026 - 10:30 AM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Southern Company reported that Comptroller Matthew M. Kim sold 100 shares of Southern Company Common Stock on 2026-08-03 at $94.28 per share in an open market or private transaction pursuant to a Rule 10b5-1 trading plan.

After the sale he held 6,488 shares directly and 1,222.207 shares indirectly through a 401(k) plan.

Insider Trade Summary 10b5-1

Net Seller: 100 shares

Net Sell 1 txn

Insider Kim Matthew M.

Role Comptroller

Sold 100 shs ($9K)

Share of Position Sold 1.5%

Type	Security	Shares	Price	Value
Sale	Southern Company Common Stock	100	$94.28	$9K
Holding	Southern Company Common Stock	--	--	--

Holdings After Transaction: Southern Company Common Stock — 6,488 shares (Direct); Southern Company Common Stock — 1,222.207 shares (Indirect, 401(k))

Holdings Before and After: Southern Company Common Stock, 6,588 to 6,488 shares (Direct)

Key Figures

Shares sold: 100.0000 shares Sale price: $94.2800 per share Direct holdings after sale: 6488.0000 shares +1 more

4 metrics

Shares sold 100.0000 shares Southern Company Common Stock sold on 2026-08-03

Sale price $94.2800 per share Price per share for the 2026-08-03 sale

Direct holdings after sale 6488.0000 shares Directly owned Southern Company shares following the reported sale

Indirect 401(k) holdings 1222.2070 shares Indirect Southern Company shares held through a 401(k) plan

Key Terms

Southern Company Common Stock, indirect ownership, 401(k), open market or private transaction

4 terms

Southern Company Common Stock financial

"Security title reported as Southern Company Common Stock"

indirect ownership financial

"Ownership type marked as indirect for 401(k) holdings"

401(k) financial

"Nature of ownership described as 401(k) for certain shares"

A 401(k) is a type of retirement savings plan offered by employers that allows workers to set aside a portion of their paycheck before taxes are taken out. The money saved in a 401(k) can grow over time through investments, helping individuals build funds for their future retirement. It matters to investors because it provides a tax-advantaged way to save and invest for long-term financial security.

open market or private transaction financial

"Description notes a sale in open market or private transaction"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Southern Company (SO) disclose?

Southern Company disclosed that Comptroller Matthew M. Kim sold 100 shares of Southern Company Common Stock on 2026-08-03. The transaction was reported as a sale in an open market or private transaction under a Rule 10b5-1 trading plan.

How many Southern Company (SO) shares did Matthew M. Kim sell and at what price?

Matthew M. Kim sold 100 shares of Southern Company Common Stock at $94.28 per share on 2026-08-03. The filing describes this as a sale in an open market or private transaction pursuant to a Rule 10b5-1 trading plan.

What are Matthew M. Kim’s remaining Southern Company (SO) holdings after the sale?

After the transaction, Matthew M. Kim held 6,488 shares of Southern Company Common Stock directly. He also reported 1,222.207 shares held indirectly through a 401(k) plan, reflecting his continuing ownership interest in the company.

Was the Southern Company (SO) insider sale made under a Rule 10b5-1 trading plan?

Yes. The filing indicates the transaction was effected under a Rule 10b5-1 trading plan. Such plans allow pre-arranged trades according to preset instructions, which can limit the relevance of trade timing for interpreting insider sentiment.

How is part of Matthew M. Kim’s Southern Company (SO) stake held?

In addition to directly held shares, Matthew M. Kim reported indirect ownership of 1,222.207 shares of Southern Company Common Stock through a 401(k) plan, reflecting retirement-plan holdings separate from his directly owned shares.

What is Matthew M. Kim’s role at Southern Company (SO) in this filing?

Matthew M. Kim is identified as the company’s Comptroller, an officer role. The reported transaction therefore reflects trading activity by a senior financial officer, which is required to be disclosed through this type of insider ownership report.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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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 GEORGIA 30308

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/03/2026

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

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

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

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	08/03/2026		S		100	D	$94.28	6,488	D
Southern Company Common Stock								1,222.207	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	08/04/2026
	** 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.
* Form 4: SEC 1474 (03-26)