Southern Company (SO) EVP trims 401(k) stock position in discretionary plan move

Rhea-AI Filing Summary

Southern Company executive Spainhour Sterling A Jr., EVP & CLO, reported a discretionary transaction involving Southern Company Common Stock tied to his 401(k) plan. On March 6, 2026, he sold 6,330.0066 shares at $97.64 per share in connection with a 401(k) rebalancing, leaving 704.2169 shares held indirectly through the plan. Following this filing, he also reported owning 38,552 shares of Southern Company Common Stock directly.

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

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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^*

Spainhour Sterling A Jr.

(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)
	EVP & CLO

3. Date of Earliest Transaction (Month/Day/Year)
03/06/2026

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(1)	03/06/2026		I		6,330.0066	D	$97.64	704.2169	I	401(k)
Southern Company Common Stock								38,552	D

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:

1. Sale of shares in connection with rebalancing of 401(k)

	/s/ Brittney Anderson, Attorney-in-Fact for Sterling A. Spainhour	03/10/2026
	** 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 Spainhour Sterling A Jr.?

Southern Company reported a discretionary transaction by EVP & CLO Spainhour Sterling A Jr. involving Southern Company Common Stock. The action occurred within his 401(k) plan and reflects a portfolio rebalancing rather than an open-market trade.

How many Southern Company (SO) shares were sold in the 401(k) rebalancing?

Spainhour Sterling A Jr. sold 6,330.0066 shares of Southern Company Common Stock at $97.64 per share in connection with a 401(k) rebalancing, according to the Form 4 footnote describing the transaction as a sale within the retirement plan.

What are Spainhour Sterling A Jr.’s Southern Company (SO) holdings after this Form 4?

After the reported transactions, Spainhour Sterling A Jr. held 38,552 shares of Southern Company Common Stock directly and 704.2169 shares indirectly through a 401(k) plan, as disclosed by the post-transaction ownership figures in the filing.

Was the Southern Company (SO) insider transaction an open-market trade?

The filing indicates the transaction was a discretionary transaction under Rule 16b-3(f) within a 401(k) plan. A footnote states it was a sale of shares in connection with rebalancing the 401(k), not an open-market purchase or sale on an exchange.

What role does Spainhour Sterling A Jr. hold at Southern Company (SO)?

Spainhour Sterling A Jr. is reported as an Executive Vice President and Chief Legal Officer of Southern Company. His status as an officer makes his transactions in Southern Company Common Stock subject to Form 4 reporting requirements under U.S. securities regulations.

How is the 401(k) ownership of Southern Company (SO) shares classified in the Form 4?

The Form 4 classifies the 401(k) holdings as indirect ownership with the nature of ownership labeled “401(k).” After the rebalancing sale, these indirect holdings totaled 704.2169 shares of Southern Company Common Stock held through the retirement plan.