Southern Company officer proposes $306K share sale

Sterling Spainhour also reported a separate 3,333-share sale on August 6, 2026, during the preceding three months.

Available on EDGAR 11/06/2026 - 04:08 PM EST Accepted by SEC EDGAR 11/06/2026 - 04:08 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Southern Company (SO) officer Sterling Spainhour reported a proposed sale of 3,333 common shares, with an aggregate market value of $306,002.73 and an approximate sale date of November 6, 2026. The notice lists the shares as acquired through a performance stock vest on February 11, 2026. It also reports that Spainhour sold 3,333 common shares on August 6, 2026, with an aggregate market value of $313,368.66, during the preceding three months.

Key Figures

Proposed sale: 3,333 shares Proposed sale aggregate market value: $306,002.73 Shares outstanding: 1,164,261,029 shares +2 more

5 metrics

Proposed sale 3,333 shares Approximate sale date: November 6, 2026

Proposed sale aggregate market value $306,002.73 Proposed sale

Shares outstanding 1,164,261,029 shares Issuer shares outstanding

Shares sold 3,333 shares Sale reported for August 6, 2026

Aggregate market value of shares sold $313,368.66 Sale reported for August 6, 2026

Key Terms

Rule 144, Performance Stock Vest, Compensatory Payment

3 terms

Rule 144 regulatory

"sales required by paragraph (e) of Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Performance Stock Vest financial

"Performance Stock Vest"

Compensatory Payment financial

"Compensatory Payment"

FAQ

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

How many Southern Company (SO) shares does Sterling Spainhour plan to sell?

The notice lists a proposed sale of 3,333 common shares, with an aggregate market value of $306,002.73. The approximate sale date is November 6, 2026.

What recent Southern Company (SO) share sale did Sterling Spainhour report?

Spainhour reported selling 3,333 common shares on August 6, 2026, during the preceding three months. The listed aggregate market value was $313,368.66.

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

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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	0001849295
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Southern Company
SEC File Number	001-03526
Address of Issuer	30 Ivan Allen Blvd NW Atlanta GEORGIA 30308
Phone	4045065000
Name of Person for Whose Account the Securities are To Be Sold	Sterling Spainhour
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	Officer

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
Southern Company	Merrill Lynch 3455 Peachtree Road NE Suite 1000 Atlanta GA 30326	3333	306002.73	1164261029	11/06/2026	NYSE

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	02/11/2026	Performance Stock Vest	Southern Company			3333	02/11/2026	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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Sterling Spainhour 30 Ivan Allen Blvd NW Atlanta GA 30308	Common	08/06/2026	3333	313368.66

144: Remarks and Signature

Remarks
Date of Notice	11/06/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	11/25/2025
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	Sterling Spainhour
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)