Southern Co officer plans sale of 1,400 shares

SOUTHERN CO (SO) has an officer, Matthew Kim, filing a Rule 144 notice to sell up to 1,400 shares of Southern Company common stock through Merrill Lynch on the NYSE.

Rhea-AI Filing Summary

SOUTHERN CO (SO) has an officer, Matthew Kim, filing a Rule 144 notice to sell up to 1,400 shares of Southern Company common stock through Merrill Lynch on the NYSE. The shares were acquired via vested performance stock and restricted stock unit awards treated as compensatory payments.

The filing also lists recent sales by Matthew Kim totaling 300 shares of common stock over the past three months in three separate 100‑share transactions.

Key Figures

Shares proposed for sale: 1,400 shares Performance stock vest (2020): 485 shares Performance stock vest (2021): 799 shares +4 more

7 metrics

Shares proposed for sale 1,400 shares Southern Company common stock under Rule 144 for Matthew Kim

Performance stock vest (2020) 485 shares Performance stock vesting on February 11, 2020 as compensatory payment

Performance stock vest (2021) 799 shares Performance stock vesting on February 12, 2021 as compensatory payment

Restricted stock unit vest (2024) 116 shares Restricted stock unit vesting on February 3, 2024 as compensatory payment

Shares sold July 1, 2026 100 shares Matthew Kim sale of Southern Company common stock

Shares sold August 3, 2026 100 shares Matthew Kim sale of Southern Company common stock

Shares sold September 1, 2026 100 shares Matthew Kim sale of Southern Company common stock

Key Terms

Rule 144, Performance Stock Vest, Restricted Stock Unit Vest, Compensatory Payment

4 terms

Rule 144 regulatory

"See the 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

"Common | 02/11/2020 | Performance Stock Vest | The Southern Company"

Restricted Stock Unit Vest financial

"Common | 02/03/2024 | Restricted Stock Unit Vest | The Southern Company"

Compensatory Payment financial

"116 | 02/03/2024 | Compensatory Payment"

FAQ

What does Southern Company (SO)'s latest Form 144 filing disclose?

It discloses that officer Matthew Kim filed a Rule 144 notice to sell up to 1,400 shares of Southern Company common stock through Merrill Lynch on the NYSE, with the shares originally acquired via vested performance stock and restricted stock unit awards.

How many Southern Company (SO) shares does Matthew Kim plan to sell under this Form 144?

The notice covers a proposed sale of up to 1,400 shares of Southern Company common stock, to be sold through Merrill Lynch on the NYSE as disclosed in the Form 144 securities information section.

What is the source of the Southern Company (SO) shares in Matthew Kim's Form 144?

The shares relate to equity awards from Southern Company, including performance stock vesting on February 11, 2020 and February 12, 2021 and a restricted stock unit vesting on February 3, 2024, each described as a compensatory payment.

What Southern Company (SO) share sales has Matthew Kim made in the past three months?

The filing reports three recent transactions: sales of 100 shares of Southern Company common stock on each of July 1, 2026, August 3, 2026, and September 1, 2026, totaling 300 shares over the three-month period.

Who is the broker for the planned Southern Company (SO) share sale under Rule 144?

The Form 144 lists Merrill Lynch, located in Atlanta, Georgia, as the broker handling the proposed sale of up to 1,400 shares of Southern Company common stock on the NYSE.

What is Matthew Kim’s relationship to Southern Company (SO) in this Form 144?

Matthew Kim is identified in the filing as an officer of Southern Company. The Form 144 is filed for his account in connection with a planned sale of company common stock under Rule 144.

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Available on EDGAR 09/03/2026 - 04:01 PM Accepted by SEC EDGAR 09/03/2026 - 04:01 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 BLVD NW Atlanta GEORGIA 30308
Phone	404-506-5000
Name of Person for Whose Account the Securities are To Be Sold	MATTHEW 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	1400	124418	1150362966	09/03/2026	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	02/11/2020	Performance Stock Vest	The Southern Company			485	02/11/2020	Compensatory Payment
Common	02/12/2021	Performance Stock Vest	The Southern Company			799	02/12/2021	Compensatory Payment
Common	02/03/2024	Restricted Stock Unit Vest	The Southern Company			116	02/03/2024	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 Kim 30 Ivan Allen Jr Blvd NW Atlanta GA 30308	Common	09/01/2026	100	8845
Matthew Kim 30 Ivan Allen Jr Blvd NW Atlanta GA 30308	Common	08/03/2026	100	9428
Matthew Kim 30 Ivan Allen Jr Blvd NW Atlanta GA 30308	Common	07/01/2026	100	9577

144: Remarks and Signature

Remarks
Date of Notice	09/03/2026
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 KIM
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)