SO Form 144 Notice — Insider Plans to Sell 6,206 Shares Valued at $582K

Rhea-AI Filing Summary

Form 144 notice filed for Southern Company (SO) proposing the sale of 6,206 common shares through Merrill Lynch in New York with an aggregate market value of $582,308.98. The filing lists an approximate sale date of 09/30/2025 and shows 1,100,047,407 shares outstanding, indicating the proposed sale is a small fraction of total equity. The shares to be sold were acquired through restricted stock vesting and performance stock unit vesting on multiple dates in 2023 and 2024, with the largest individual lots noted as 1,617 and 985 shares. The filer represents they have no undisclosed material adverse information and no securities were sold in the past three months per the notice.

Insights

Financial Analyst

TL;DR: Proposed sale is immaterial to Southern Company's market capitalization and likely a routine insider liquidity event.

The filing reports 6,206 common shares valued at $582,308.98 against 1,100,047,407 shares outstanding, representing a de minimis ownership transfer relative to total equity. The underlying holdings were granted as compensation (restricted stock and performance units) between February 2023 and February 2024. No sales in the prior three months are reported, and the transaction is scheduled through a broker, indicating a standard disposition under Rule 144. From a financial-materiality perspective, this notice is routine and unlikely to move markets or alter investor valuation assumptions.

Corporate Governance Expert

TL;DR: Disclosure follows Rule 144 mechanics; signals executive or insider selling vested compensation, not a governance red flag by itself.

The document identifies sale execution via Merrill Lynch and reiterates the filer’s certification of no undisclosed material information. The securities were acquired as compensatory grants and vested across several dates, consistent with normal executive compensation practices. Because the quantity is small relative to total shares outstanding and the filer used the prescribed disclosure form, this appears to be a routine compliance disclosure rather than an indicator of governance concerns. Monitor only if further, larger dispositions are filed.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
COMMON	MERRILL LYNCH 3455 PEACHTREE RD NE SUITE 1000 ATLANTA GA 30326	6206	582308.98	1100047407	09/30/2025	NEW YORK

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
COMMON	02/03/2023	RESTRICTED STOCK VEST (S)	SOUTHERN COMPANY			799	02/03/2023	COMPENSATORY PAYMENT
COMMON	02/11/2023	RESTRICTED STOCK VEST (S)	SOUTHERN COMPANY			270	02/11/2023	COMPENSATORY PAYMENT
COMMON	02/13/2023	RESTRICTED STOCK VEST (S)	SOUTHERN COMPANY			832	02/13/2023	COMPENSATORY PAYMENT
COMMON	02/03/2024	RESTRICTED STOCK VEST (S)	SOUTHERN COMPANY			837	02/03/2024	COMPENSATORY PAYMENT
COMMON	02/13/2024	RESTRICTED STOCK VEST (S)	SOUTHERN COMPANY			866	02/13/2024	COMPENSATORY PAYMENT
COMMON	02/07/2024	RESTRICTED STOCK VEST (S)	SOUTHERN COMPANY			985	02/07/2024	COMPENSATORY PAYMENT
COMMON	02/13/2023	PERFORMANCE STOCK UNIT VEST	SOUTHERN COMPANY			1617	02/13/2023	COMPENSATORY PAYMENT

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does Southern Co (SO) Form 144 report?

The filing reports a proposed sale of 6,206 common shares via Merrill Lynch with an aggregate market value of $582,308.98 and an approximate sale date of 09/30/2025.

How were the shares in the Form 144 acquired?

The shares were acquired through restricted stock vesting and performance stock unit vesting from Southern Company on various dates in February 2023 and February 2024.

How many Southern Company shares are outstanding per the filing?

The filing shows 1,100,047,407 shares outstanding for Southern Company.

Did the filer report any securities sold in the past three months?

No. The filing states "Nothing to Report" for securities sold during the past three months by the person for whose account the securities are to be sold.

Through which broker will the shares be sold?

The proposed sale is to be executed through Merrill Lynch, 3455 Peachtree Rd NE, Atlanta, GA, and the exchange listed is New York.