Southern Co comptroller sells 1,400 shares

Southern Co’s comptroller reported a September 3, 2026 open-market stock sale and updated direct and 401(k) share holdings.

Rhea-AI Filing Summary

SOUTHERN CO (SO) reported that Comptroller Matthew M. Kim sold 1,400 shares of Southern Company common stock on September 3, 2026 in a sale classified as an open-market or private transaction at $88.87 per share. After this sale, he held 4,988 shares directly and 1,222.207 shares indirectly through a 401(k). No Rule 10b5-1 trading plan is reported for these transactions.

Insider Trade Summary

Net Seller: 1,400 shares

Net Sell 2 txns

Insider Kim Matthew M.

Role Comptroller

Sold 1,400 shs ($124K)

Type	Security	Shares	Price	Value
Sale	Southern Company Common Stock	1,400	$88.87	$124K
holding	Southern Company Common Stock	--	--	--

Holdings After Transaction: Southern Company Common Stock — 4,988 shares (Direct); Southern Company Common Stock — 1,222.207 shares (Indirect, 401(k))

Key Figures

Shares sold: 1,400 shares Sale price per share: $88.87 per share Direct holdings after transaction: 4,988 shares +1 more

4 metrics

Shares sold 1,400 shares Open-market or private sale on September 3, 2026

Sale price per share $88.87 per share Southern Company common stock sold on September 3, 2026

Direct holdings after transaction 4,988 shares Common stock directly held by Matthew M. Kim after sale

Indirect 401(k) holdings 1,222.207 shares Common stock held indirectly through a 401(k) after the reported date

Key Terms

Rule 10b5-1 trading plan, indirect, 401(k)

3 terms

Rule 10b5-1 trading plan regulatory

"No Rule 10b5-1 trading plan is reported for these transactions"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

indirect financial

"1,222.207 shares indirectly through a 401(k) plan"

401(k) financial

"1,222.207 shares indirectly through a 401(k) plan"

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.

FAQ

What insider transaction did SOUTHERN CO (SO) report for Matthew M. Kim?

Comptroller Matthew M. Kim reported a sale of 1,400 shares of Southern Company common stock on September 3, 2026, classified as an open-market or private transaction at $88.87 per share.

How many SOUTHERN CO (SO) shares did the comptroller hold after the transaction?

After the September 3, 2026 sale, Matthew M. Kim held 4,988 shares of Southern Company common stock directly and 1,222.207 shares indirectly through a 401(k) plan.

Was the SOUTHERN CO (SO) insider sale made under a Rule 10b5-1 plan?

No. The filing indicates that no Rule 10b5-1 trading plan applies to the reported transactions for Matthew M. Kim.

What price did the SOUTHERN CO (SO) shares sell for in the insider trade?

The 1,400 Southern Company common shares sold by Matthew M. Kim on September 3, 2026 were reported at a price of $88.87 per share.

What type of ownership is reported for the comptroller’s 401(k) shares of SOUTHERN CO (SO)?

The filing lists 1,222.207 shares of Southern Company common stock as held indirectly by Matthew M. Kim through a 401(k) plan.

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

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Available on EDGAR 09/04/2026 - 01:00 PM Accepted by SEC EDGAR 09/04/2026 - 01:00 PM Learn about SEC filing dates

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).

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)
09/03/2026

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	09/03/2026		S		1,400	D	$88.87	4,988	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	09/04/2026
	** 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)