Southern Co comptroller sells 100 shares

Southern Company Comptroller Matthew M. Kim reported a small insider sale of common stock.

Rhea-AI Filing Summary

Southern Company Comptroller Matthew M. Kim reported a small insider sale of common stock. On June 1, 2026, he completed an open-market sale of 100 shares of Southern Company Common Stock at $91.16 per share.

After this sale, Kim directly holds 6,688 shares of Southern Company Common Stock and indirectly holds 1,212.1903 shares through a 401(k) plan. The transaction size is modest relative to his reported holdings and appears as routine portfolio activity.

Insights

Equity analyst

Small open-market sale by Southern Company comptroller looks routine in scale.

Comptroller Matthew M. Kim executed an open-market sale of 100 Southern Company Common Stock shares at $91.16 per share on June 1, 2026. This is categorized as a non-derivative transaction, not linked to option exercises or other complex instruments.

Following the sale, he directly owns 6,688 shares and indirectly holds 1,212.1903 shares in a 401(k) account. With only 100 shares sold, the transaction represents a small portion of his disclosed holdings, suggesting routine diversification or liquidity rather than a major change in his equity exposure.

Insider Trade Summary 10b5-1

Net Seller: 100 shares

Net Sell 2 txns

Insider Kim Matthew M.

Role Comptroller

Sold 100 shs ($9K)

Type	Security	Shares	Price	Value
Sale	Southern Company Common Stock	100	$91.16	$9K
holding	Southern Company Common Stock	--	--	--

Holdings After Transaction: Southern Company Common Stock — 6,688 shares (Direct); Southern Company Common Stock — 1,212.1903 shares (Indirect, 401(k))

Key Figures

Shares sold: 100 shares Sale price: $91.16 per share Direct holdings after sale: 6,688 shares +2 more

5 metrics

Shares sold 100 shares Open-market sale of Southern Company Common Stock on June 1, 2026

Sale price $91.16 per share Price for 100-share open-market sale

Direct holdings after sale 6,688 shares Southern Company Common Stock directly owned post-transaction

Indirect 401(k) holdings 1,212.1903 shares Southern Company Common Stock held indirectly via 401(k)

Net buy/sell direction Net-sell of 100 shares transactionSummary for this Form 4

Key Terms

open-market sale, Southern Company Common Stock, 401(k)

3 terms

open-market sale financial

"Sale in open market or private transaction"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Southern Company Common Stock financial

"security_title: Southern Company Common Stock"

401(k) financial

"nature_of_ownership: 401(k)"

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

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

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

Southern Company reported that Comptroller Matthew M. Kim sold 100 shares of Southern Company Common Stock in an open-market transaction at $91.16 per share, while retaining 6,688 shares directly and 1,212.1903 shares indirectly through a 401(k) plan after the sale.

At what price did the Southern Co (SO) comptroller sell shares?

Comptroller Matthew M. Kim sold 100 shares of Southern Company Common Stock at $91.16 per share. This price reflects the execution level for the reported open-market trade on June 1, 2026, based on the Form 4 insider transaction disclosure.

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

After the reported transaction, Matthew M. Kim directly holds 6,688 shares of Southern Company Common Stock and indirectly holds 1,212.1903 shares in a 401(k) account, according to the Form 4, indicating he retains a substantial personal stake in the company.

Was the Southern Co (SO) insider transaction a buy or a sell?

The transaction was a sell. The Form 4 lists a non-derivative open-market sale coded “S” for 100 shares of Southern Company Common Stock executed at $91.16 per share by Comptroller Matthew M. Kim on June 1, 2026.

Does the Form 4 for Southern Co (SO) show any derivative exercises?

No derivative exercises are shown in this Form 4. The filing reports one non-derivative open-market sale of 100 shares and a separate 401(k) holding entry, with the derivativeSummary section indicating no outstanding derivative transactions in this particular report.

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

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Accepted by SEC EDGAR 06/01/2026 - 04:00 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).

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)
06/01/2026

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	06/01/2026		S		100	D	$91.16	6,688	D
Southern Company Common Stock								1,212.1903	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	06/01/2026
	** 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)