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SOUTHERN CO

For the period ended Oct 20, 2026. Filed Oct 22, 2026.

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A notice of a major event between regular reports, such as results, a deal or a change of executives. It is often the first formal record of the news.

Oct 20, 2026 · Filed Oct 22, 2026

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SO$92.34-1.1%Stored close · as of Nov 6, 2026
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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D. C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported)October 20, 2026
CommissionFile NumberRegistrant,State of Incorporation,Address and Telephone NumberI.R.S. EmployerIdentification No.
1-3526The Southern Company58-0690070

(ADelaware Corporation)

30 Ivan Allen Jr. Boulevard, N.W.

Atlanta, Georgia 30308

(404)506-5000

The name and address of the registrant have not changed since the last report.

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

RegistrantTitle of each classTradingSymbol(s)Name of each exchangeon which registered
The Southern CompanyCommon Stock, par value $0.01 per shareSONew York Stock Exchange
The Southern CompanySeries 2017B 5.25% Junior Subordinated Notes due 2077SOJCNew York Stock Exchange
The Southern CompanySeries 2020A 4.95% Junior Subordinated Notes due 2080SOJDNew York Stock Exchange
The Southern CompanySeries 2020C 4.20% Junior Subordinated Notes due 2060SOJENew York Stock Exchange
The Southern CompanySeries 2021B 1.875% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2081SO 81New York Stock Exchange
The Southern CompanySeries 2025A 6.50% Junior Subordinated Notes due 2085SOJFNew York Stock Exchange
The Southern Company2025 Series A Corporate UnitsSOMNNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐

Item 5.03.Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.

On October 20, 2026, the Board of Directors (the “Board”) of The Southern Company (the “Company”) amended and restated the Company’s By-Laws (as so amended and restated, the “Amended and Restated By-Laws”), which were immediately effective. The amendments, among other things:

update certain requirements under the

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