Southern Co.: Regulation Fd Disclosure, Financial Statements And Exhibits

Item 7.01.Regulation FD Disclosure.On September 15, 2025, The Southern Company (the “Company”) announced an adjustment (the “Adjustment”) to the conversion rate for its Series 2023A 3.875% Convertible Senior Notes due December 15, 2025 (the “Series 2023A Convertible Senior Notes”). The notice of the Adjustment is attached as Exhibit 99.1 to this Current Report on Form 8-K and will also be posted to the fixed income section of the Company’s investor relations website — https://investor.southerncompany.com/fixed-income/default.aspx — under the “Additional Information” heading. The Company advises that it intends to make public disclosures in this location of its website for conversion rate adjustments (if any) for the Series 2023A Convertible Senior Notes, its Series 2024A 4.50% Convertible Senior Notes due June 15, 2027, its Series 2025A 3.25% Convertible Senior Notes due June 15, 2028 and other convertible notes (if any) it issues in the future.Item 9.01.Financial Statements and Exhibits. (d) Exhibits. 99.1Notice to Holders of the Series 2023A Convertible Senior Notes. 104Cover Page Interactive Data File – The cover page iXBRL tags are embedded within the inline XBRL document.SIGNATUREPursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.Date: September 15, 2025THE SOUTHERN COMPANYBy/s/Melissa K. CaenMelissa K. CaenAssistant Secretary2

Southern Co.: Regulation Fd Disclosure, Financial Statements And Exhibits

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