Southern Co CEO reports RSU vesting, tax withholding

Southern Co executive Peter P. Sena III reported routine equity compensation activity.

Rhea-AI Filing Summary

Southern Co executive Peter P. Sena III reported routine equity compensation activity. On June 28, 2026, he acquired 667 performance restricted stock units, representing the second one‑third of an award originally granted on June 28, 2024, including 45 dividend equivalent units. A portion of the resulting common shares, 316 shares, was withheld to satisfy required state and federal tax withholding obligations, rather than sold in the open market. These transactions reflect vesting and tax payments, not discretionary open‑market buying or selling.

Insider Trade Summary

667 shares exercised/converted

Exercise 3 txns

Insider Sena Peter P III

Role Chairman,President & CEO, SNC

Type	Security	Shares	Price	Value
Exercise	Performance Restricted Stock Units	667	$0.00	$0.00
Exercise	Southern Company Common Stock	712	$0.00	$0.00
Exercise Price or Tax Liability	Southern Company Common Stock	316	$97.16	$31K

Holdings After Transaction: Performance Restricted Stock Units — 667 contracts (Direct); Southern Company Common Stock — 31,201 shares (Direct)

Footnotes (3)

1. F1. Shares acquired upon vesting of second 1/3 of performance restricted stock units granted on June 28, 2024. Includes 45 accrued dividend equivalent units.
2. F2. Shares withheld to satisfy required state and federal tax withholding requirements.
3. F3. Represents second 1/3 of performance restricted stock units granted on June 28, 2024. The remaining award will vest in 2027. Each restricted stock unit represents the right to receive, at settlement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

Key Figures

Vested performance RSUs: 667 units Dividend equivalent units: 45 units Shares withheld for taxes: 316 shares +2 more

5 metrics

Vested performance RSUs 667 units Second one-third of award granted June 28, 2024

Dividend equivalent units 45 units Included within vested performance restricted stock units

Shares withheld for taxes 316 shares Withheld to satisfy state and federal tax requirements

Derivative exercises 1 transaction, 667 shares Exercise/conversion of performance restricted stock units on June 28, 2026

Tax-withholding transactions 1 transaction, 316 shares Payment of tax liability by delivering securities

Key Terms

Performance Restricted Stock Units, dividend equivalent units, tax withholding requirements

3 terms

Performance Restricted Stock Units financial

"Represents second 1/3 of performance restricted stock units granted on June 28, 2024."

Performance restricted stock units (PRSUs) are promises to deliver company shares to employees or executives only if the business meets specific performance targets and any time-based holding rules. Think of them as a bonus that converts into stock only after set goals are reached, so investors watch PRSUs for two reasons: they can dilute existing shares if paid out, and they signal how closely management’s pay is tied to company performance.

dividend equivalent units financial

"Includes 45 accrued dividend equivalent units."

Dividend equivalent units are bookkeeping credits that mirror cash dividends paid on actual shares, granted to holders of stock-based awards such as restricted stock units or deferred compensation. They matter to investors because they increase a company’s reported employee compensation cost and can lead to issuance of more shares or cash payouts over time, similar to extra pay linked to ownership that affects shareholder dilution and corporate cash flow.

tax withholding requirements financial

"Shares withheld to satisfy required state and federal tax withholding requirements."

FAQ

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

What insider transaction did Southern Co (SO) report for Peter P. Sena III?

Southern Co reported that executive Peter P. Sena III had performance restricted stock units vest and convert into common shares, with some shares withheld to cover taxes. The filing reflects routine compensation vesting, not an open-market purchase or sale of stock.

How many performance restricted stock units vested for Southern Co (SO) executive Peter Sena?

A total of 667 performance restricted stock units vested for Peter P. Sena III. The award represents the second one-third of a grant made on June 28, 2024, and includes 45 additional units credited as dividend equivalents under the company’s compensation plan.

Why were some Southern Co (SO) shares withheld in Peter Sena’s Form 4 filing?

The Form 4 shows 316 Southern Co common shares were withheld to satisfy required state and federal tax withholding requirements. This tax-withholding disposition is an automatic mechanism tied to vesting and does not represent an open-market sale initiated by the executive.

Is the Southern Co (SO) Form 4 for Peter Sena an open-market stock sale?

No, the Form 4 does not report an open-market sale. It shows shares acquired through vesting of performance restricted stock units and a portion of those shares withheld for taxes. These are compensation and tax events rather than discretionary trades on the market.

What does the performance restricted stock unit award mean for Southern Co (SO) leadership?

The award shows part of Peter P. Sena III’s compensation is tied to performance restricted stock units that vest over time. On June 28, 2026, the second one-third of his June 28, 2024 grant vested, further aligning his compensation with Southern Co’s stock performance.

Will more performance restricted stock units vest for Southern Co (SO) executive Peter Sena?

Yes, the footnotes state the reported tranche represents the second one-third of performance restricted stock units granted June 28, 2024. The remaining portion of this award is scheduled to vest in 2027, with additional units added as deemed dividends until settlement.

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

Form 4 Insider Transactions: What Each Field Means →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Accepted by SEC EDGAR 06/29/2026 - 04:00 PM EDT 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^*

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)
06/28/2026

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	06/28/2026		M		712(1)	A	$0	31,517	D
Southern Company Common Stock	06/28/2026		F		316(2)	D	$97.16	31,201	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
Performance Restricted Stock Units	$0	06/28/2026		M			667(3)	(3)	(3)	Southern Company Common Stock	667(3)	$0	667	D

Explanation of Responses:

1. Shares acquired upon vesting of second 1/3 of performance restricted stock units granted on June 28, 2024. Includes 45 accrued dividend equivalent units.

2. Shares withheld to satisfy required state and federal tax withholding requirements.

3. Represents second 1/3 of performance restricted stock units granted on June 28, 2024. The remaining award will vest in 2027. Each restricted stock unit represents the right to receive, at settlement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.

	/s/ Brittney Anderson, Attorney-in-Fact for Peter P. Sena, III	06/29/2026
	** 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)