Southern Company officer proposes 100-share sale

The notice also records three earlier sales in the preceding three months: 1,400 shares on September 3, followed by 100 shares on each of September 1 and August 3, 2026.

Rhea-AI Filing Summary

The Southern Company (SO) officer Matthew M. Kim filed a notice of proposed sale of 100 common shares, with an aggregate market value of $8,273. Merrill Lynch is listed as broker, with an approximate sale date of October 1, 2026, and NYSE as the exchange. The notice also lists prior sales of 1,400 shares on September 3, 2026, 100 shares on September 1, and 100 shares on August 3.

Key Figures

Shares proposed for sale: 100 shares Aggregate market value: $8,273 Shares sold: 1,400 shares +5 more

8 metrics

Shares proposed for sale 100 shares Proposed sale

Aggregate market value $8,273 Proposed sale

Shares sold 1,400 shares September 3, 2026

Gross proceeds $124,418 Sale on September 3, 2026

Shares sold 100 shares September 1, 2026

Gross proceeds $8,845 Sale on September 1, 2026

Shares sold 100 shares August 3, 2026

Gross proceeds $9,428 Sale on August 3, 2026

Key Terms

Rule 144, Performance Stock Vest, Compensatory Payment

3 terms

Rule 144 regulatory

"definition of "person" in paragraph (a) 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 SO shares is Matthew M. Kim proposing to sell?

Matthew M. Kim, an officer of The Southern Company, listed 100 common shares for a proposed sale, with an aggregate market value of $8,273. Merrill Lynch is listed as broker, with an approximate sale date of October 1, 2026, on NYSE.

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

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Available on EDGAR 10/01/2026 - 04:12 PM Accepted by SEC EDGAR 10/01/2026 - 04:12 PM Learn about SEC filing dates

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	0002082705
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	The Southern Company
SEC File Number	001-03526
Address of Issuer	30 Ivan Allen Jr. Boulevard, N.W. Atlanta GEORGIA 30308
Phone	4045065000
Name of Person for Whose Account the Securities are To Be Sold	Matthew M. Kim
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
Common	Merrill Lynch 3455 Peachtree Road NE, Suite 1000 Atlanta GA 30326	100	8273	1150362966	10/01/2026	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	02/07/2024	Performance Stock Vest	Southern Company			100	02/07/2024	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
Matthew M. Kim 30 Ivan Allen Jr. Boulevard, N.W. Atlanta GA 30308	Common	09/03/2026	1400	124418
Matthew M. Kim 30 Ivan Allen Jr. Boulevard, N.W. Atlanta GA 30308	Common	09/01/2026	100	8845
Matthew M. Kim 30 Ivan Allen Jr. Boulevard, N.W. Atlanta GA 30308	Common	08/03/2026	100	9428

144: Remarks and Signature

Remarks
Date of Notice	10/01/2026
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	Matthew M. Kim
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)