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Southern Co executive Spainhour sells 3,333 shares

The sale was reported under a Rule 10b5-1 plan, and 31,886 directly held shares remained afterward.

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Form Type
4

Rhea-AI Filing Summary

Southern Company EVP & CLO Sterling A. Spainhour Jr. sold 3,333 common shares on November 6, 2026, at $91.81 per share. The sale was reported under a Rule 10b5-1 plan. Afterward, Spainhour directly held 31,886 shares; 984 shares were listed indirectly through a 401(k).

Insider Spainhour Sterling A Jr.
Role EVP & CLO
Sold 3,333 shs ($306K)
Share of Position Sold 9.5%
Type Security Shares Price Value
Sale Southern Company Common Stock 3,333 $91.81 $306K
Holding Southern Company Common Stock -- -- --
Holdings After Transaction: Southern Company Common Stock — 31,886 shares (Direct); Southern Company Common Stock — 983.7344 shares (Indirect, 401(k))
Holdings Before and After: Southern Company Common Stock, 35,219 to 31,886 shares (Direct)
Other Insiders: 1 other insider reported open-market sales of this stock in the 30 days up to this filing.
Shares sold 3,333 shares November 6, 2026
Sale price $91.81 per share November 6, 2026
Direct shares after sale 31,886 shares Reported after the sale
Indirect 401(k) holding 984 shares Reported November 6, 2026
Rule 10b5-1 plan regulatory
"sale reported under a Rule 10b5-1 plan"
A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.
401(k) financial
"shares held indirectly through a 401(k)"
A 401(k) is a type of retirement savings plan offered by employers that allows workers to set aside a portion of their paycheck before taxes are taken out. The money saved in a 401(k) can grow over time through investments, helping individuals build funds for their future retirement. It matters to investors because it provides a tax-advantaged way to save and invest for long-term financial security.
non-derivative technical
"non-derivative transaction"

FAQ

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How many SO shares did Sterling A. Spainhour Jr. sell, and at what price?

Sterling A. Spainhour Jr. sold 3,333 Southern Company common shares on November 6, 2026, at $91.81 per share; the sale was reported under a Rule 10b5-1 plan.

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

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SEC Form 4
FORM 4UNITED 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).
X
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*
Spainhour Sterling A Jr.

(Last)(First)(Middle)
30 IVAN ALLEN JR BLVD NW

(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)
Director10% Owner
XOfficer (give title below)Other (specify below)
EVP & CLO
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
11/06/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Southern Company Common Stock11/06/2026S3,333D$91.8131,886D
Southern Company Common Stock983.7344I401(k)
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
/s/ Brittney Anderson, Attorney-in-Fact for Sterling A. Spainhour11/09/2026
** Signature of Reporting PersonDate
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)

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