Southern Co (SO) comptroller sells 100 shares, holds 6,788 after

Rhea-AI Filing Summary

Southern Company comptroller Matthew M. Kim reported an open-market sale of Southern Company Common Stock. He sold 100 shares at $96.57 per share. After this sale, he directly owns 6,788 shares of Southern Company Common Stock and also holds 1,212.1903 shares indirectly through a 401(k) plan.

Insights

Equity compensation and insider-trading analyst

Comptroller’s 100-share sale is small relative to his remaining holdings.

Matthew M. Kim, comptroller of Southern Company, executed an open-market sale of 100 shares of common stock at $96.57 per share. This is recorded as a non-derivative transaction classified as an open-market sale.

Following the trade, he directly holds 6,788 shares and indirectly holds 1,212.1903 shares via a 401(k). The sale represents a small fraction of his visible position in this filing, which suggests a routine liquidity event rather than a transformative change in his exposure.

Insider Trade Summary 10b5-1

Net Seller: 100 shares ($9,657)

Net Sell 2 txns

Insider Kim Matthew M.

Role Comptroller

Sold 100 shs ($10K)

Type	Security	Shares	Price	Value
Sale	Southern Company Common Stock	100	$96.57	$10K
holding	Southern Company Common Stock	--	--	--

Holdings After Transaction: Southern Company Common Stock — 6,788 shares (Direct, null); Southern Company Common Stock — 1,212.19 shares (Indirect, 401(k))

Footnotes (1)

Key Figures

Shares sold: 100 shares Sale price: $96.57 per share Direct holdings after sale: 6,788 shares +2 more

5 metrics

Shares sold 100 shares Open-market sale of Southern Company Common Stock

Sale price $96.57 per share Price for 100-share open-market sale

Direct holdings after sale 6,788 shares Common stock held directly following transaction

Indirect 401(k) holdings 1,212.1903 shares Common stock held indirectly via 401(k)

Net share change -100 shares Net buy/sell shares in transaction summary

Key Terms

open-market sale, non-derivative, indirect ownership, 401(k), +1 more

5 terms

open-market sale financial

"transaction_action": "open-market sale""

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.

non-derivative financial

""transaction_type": "non-derivative""

indirect ownership financial

""ownership_type": "indirect""

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.

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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 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)
05/01/2026

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	05/01/2026		S		100	D	$96.57	6,788	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	05/04/2026
	** 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)

FAQ

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

Southern Company reported that comptroller Matthew M. Kim executed an open-market sale of 100 shares of Southern Company Common Stock at $96.57 per share. This was filed on Form 4 as a non-derivative transaction classified as a sale in the open market.

How many Southern Co (SO) shares did the comptroller sell and at what price?

Comptroller Matthew M. Kim sold 100 shares of Southern Company Common Stock at a price of $96.57 per share. The transaction is categorized as a non-derivative open-market sale and is the only reported sale transaction in this Form 4 filing.

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

After the open-market sale, Matthew M. Kim directly holds 6,788 shares of Southern Company Common Stock. In addition, he has an indirect position of 1,212.1903 shares held through a 401(k) plan, as reflected in the same Form 4 filing.

What is the indirect Southern Co (SO) ownership reported for Matthew M. Kim?

The filing shows an indirect holding of 1,212.1903 shares of Southern Company Common Stock for Matthew M. Kim through a 401(k) plan. This entry is labeled as a holding, with no specific buy or sell transaction code associated with the 401(k) position.

Does the Form 4 show multiple types of transactions for Southern Co (SO)?

Yes. The Form 4 lists one non-derivative open-market sale of 100 shares and one holding entry for 1,212.1903 shares in a 401(k). The transaction summary classifies one sale transaction and one unknown-code holding, with no derivative or gift transactions reported.

What is the net share change from Matthew M. Kim’s Southern Co (SO) transactions?

The transaction summary shows a net change of -100 shares for Matthew M. Kim, reflecting the single open-market sale of 100 shares. There were no offsetting purchases or derivative exercises reported, and derivative transaction counts remain at zero in this filing.