Southern Co officer sells 4,266 shares at $88.59

A senior Southern Nuclear Company executive sold 4,266 Southern Co (SO) shares under a Rule 10b5-1 trading plan, retaining 26,935 shares afterward.

Rhea-AI Filing Summary

SOUTHERN CO (SO) reported that Peter P. Sena III, Chairman, President & CEO of Southern Nuclear Company (SNC), sold 4,266 shares of Southern Company Common Stock on September 3, 2026 in an open-market or private transaction at $88.59 per share.

After this sale, he directly holds 26,935 shares of Southern Company Common Stock, and the transaction is affirmed as made under a Rule 10b5-1 trading plan.

Insider Trade Summary 10b5-1

Net Seller: 4,266 shares

Net Sell 1 txn

Insider Sena Peter P III

Role Chairman,President & CEO, SNC

Sold 4,266 shs ($378K)

Type	Security	Shares	Price	Value
Sale	Southern Company Common Stock	4,266	$88.59	$378K

Holdings After Transaction: Southern Company Common Stock — 26,935 shares (Direct)

Key Figures

Shares sold: 4,266 shares Sale price per share: $88.59 per share Shares held after transaction: 26,935 shares +2 more

5 metrics

Shares sold 4,266 shares Southern Company Common Stock sold by Peter P. Sena III on September 3, 2026

Sale price per share $88.59 per share Price for the 4,266 Southern Company Common Stock shares sold

Shares held after transaction 26,935 shares Direct holdings of Southern Company Common Stock by Peter P. Sena III after the sale

Net shares sold 4,266 shares Net sell direction across all transactions reported in this Form 4

Number of sell transactions 1 transaction Single open-market or private sale reported

Key Terms

Rule 10b5-1 trading plan, Southern Company Common Stock, open market or private transaction

3 terms

Rule 10b5-1 trading plan regulatory

"the transaction is affirmed as made under a Rule 10b5-1 trading plan"

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.

Southern Company Common Stock financial

"sold 4,266 shares of Southern Company Common Stock on September 3, 2026"

open market or private transaction financial

"classified as a sale in open market or private transaction"

FAQ

What insider transaction did SOUTHERN CO (SO) report for Peter P. Sena III?

Peter P. Sena III sold 4,266 shares of Southern Company Common Stock on September 3, 2026 in a reported open-market or private transaction at $88.59 per share, according to the Form 4.

What is Peter P. Sena III’s role at SOUTHERN CO (SO)?

Peter P. Sena III is reported as an officer, serving as Chairman, President & CEO of Southern Nuclear Company (SNC), an affiliate of SOUTHERN CO.

How many SOUTHERN CO (SO) shares does Peter P. Sena III own after this transaction?

After the reported sale, Peter P. Sena III directly holds 26,935 shares of Southern Company Common Stock.

At what price were the SOUTHERN CO (SO) shares sold in this Form 4 filing?

The 4,266 Southern Company Common Stock shares were sold at a price of $88.59 per share, as reported in the Form 4.

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

Yes. The filing affirms that the reported transaction was made under a Rule 10b5-1 trading plan, indicating it was executed pursuant to a pre-arranged trading arrangement.

Is this SOUTHERN CO (SO) Form 4 transaction a purchase or a sale?

It is a sale transaction. The Form 4 classifies it as a disposition of 4,266 shares of Southern Company Common Stock in an open-market or private transaction.

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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).

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^*

Sena Peter P III

(Last) (First) (Middle)

30 IVAN ALLEN JR. BLVD NW

BIN SC 803

(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)
	Chairman,President & CEO, SNC

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		4,266	D	$88.59	26,935	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:

	/s/ Brittney Anderson, Attorney-in-Fact for Peter P. Sena, III	09/03/2026
	** 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)