SO / The Southern Company - SEC फाइलिंग, वार्षिक रिपोर्ट, प्रॉक्सी स्टेटमेंट

Certificate of Southern Company's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a)1 THE SOUTHERN COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Christopher C.

Certificate of Mississippi Power's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(d) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Mississippi Power Company for the quarter ended June 30, 2025, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the

Southern Company reports second-quarter 2025 earnings

Exhibit 99 Page 1 News Media Contact: Southern Company Media Relations 404-506-5333 or 1-866-506-5333 southerncompany.

Certificate of Southern Company's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a)2 THE SOUTHERN COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Daniel S.

Certificate of Southern Power Company's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(e)2 SOUTHERN POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Gary Kerr, certify that: 1.

Certificate of Southern Company Gas' Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(f) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Southern Company Gas for the quarter ended June 30, 2025, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best

Certificate of Southern Power Company's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(e)1 SOUTHERN POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Christopher Cummiskey, certify that: 1.

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

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) July 31, 2025 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A Dela

Certificate of Alabama Power's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(b) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Alabama Power Company for the quarter ended June 30, 2025, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the bes

Certificate of Georgia Power's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(c)1 GEORGIA POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Kimberly S.

Certificate of Georgia Power's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(c) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Georgia Power Company for the quarter ended June 30, 2025, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the bes

Certificate of Alabama Power's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b)2 ALABAMA POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Moses H.

Certificate of Mississippi Power's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(d)2 MISSISSIPPI POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Matthew P.

Certificate of Southern Company Gas' Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(f)2 SOUTHERN COMPANY GAS CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Grace A.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 ☐ TRANSITION REPORT PURSUANT TO S

Table of Contents Index to Financial Statements UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Certificate of Southern Company Gas' Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(f)1 SOUTHERN COMPANY GAS CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, James Y.

Certificate of Southern Company's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(a) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of The Southern Company for the quarter ended June 30, 2025, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best

Certificate of Mississippi Power's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(d)1 MISSISSIPPI POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Anthony L.

Certificate of Alabama Power's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b)1 ALABAMA POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, J.

Certificate of Georgia Power's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(c)2 GEORGIA POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Aaron P.

Certificate of Southern Power Company's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(e) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Southern Power Company for the quarter ended June 30, 2025, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the be

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

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) July 21, 2025 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A Dela

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D. C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) July 10, 2025 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Compan

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

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) July 10, 2025 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A Dela

Other Events

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) July 1, 2025 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A Delaw

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K FOR ANNUAL REPORTS OF EMPLOYEE STOCK PURCHASE, SAVINGS AND SIMILAR PLANS PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 [X] ANNUAL REPORT PURSUANT TO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K FOR ANNUAL REPORTS OF EMPLOYEE STOCK PURCHASE, SAVINGS AND SIMILAR PLANS PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 [X] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF

Certificate of Amendment to the Certificate of Incorporation of the Company, effective May 27, 2025.

Exhibit 3.1 CERTIFICATE OF AMENDMENT OF RESTATED CERTIFICATE OF INCORPORATION OF THE SOUTHERN COMPANY THE SOUTHERN COMPANY, a company organized and existing under and by virtue of the General Corporation Law of the State of Delaware (the “Company”), DOES HEREBY CERTIFY as follows: FIRST: The Restated Certificate of Incorporation of the Company is hereby amended to delete Article Eleventh in its en

Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

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) May 21, 2025 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A Delaw

, 2025, File No. 1-3526 as Exhibit 4.

Exhibit 4.2 THE SOUTHERN COMPANY TO COMPUTERSHARE TRUST COMPANY, N.A., TRUSTEE THIRTY-FOURTH SUPPLEMENTAL INDENTURE DATED AS OF MAY 23, 2025 SERIES 2025A 3.25% CONVERTIBLE SENIOR NOTES DUE JUNE 15, 2028 TABLE OF CONTENTS1 PAGE ARTICLE 1 Series 2025A Convertible Senior Notes 2 SECTION 1.01. Establishment 2 SECTION 1.02. Definitions 2 SECTION 1.03. Payment of Principal and Interest 10 SECTION 1.04.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D. C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D. C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) February 11, 2025 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Co

Unregistered Sales of Equity Securities, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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) May 20, 2025 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A Delaw

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report THE SOUTHERN COMPANY (Exact name of registrant as specified in its charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report THE SOUTHERN COMPANY (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 1-3526 (Commission File Number) 58-0690070 (IRS Employer Identification No.) 30 Ivan Allen Jr. Blvd., N.W. Atlanta, Georgia (Address of princi

Southern Company announces upsize and pricing of $1.45 billion in aggregate principal amount of Series 2025A 3.25% Convertible Senior Notes due June 15, 2028

Exhibit 99.1 News Media Contact: Southern Company Media Relations 404-506-5333 or 1-866-506-5333 Investor Relations Contact: Greg MacLeod 404-685-4194 [email protected] Southern Company announces upsize and pricing of $1.45 billion in aggregate principal amount of Series 2025A 3.25% Convertible Senior Notes due June 15, 2028 ATLANTA, May 20, 2025 – Southern Company (NYSE: SO) today announced

Financial Statements and Exhibits, Other Events

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) May 20, 2025 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A Delaw

Financial Statements and Exhibits, Other Events

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) May 20, 2025 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A Delaw

Notice of Exempt Solicitation Pursuant to Rule 14a-103 | May 20, 2025

Notice of Exempt Solicitation Pursuant to Rule 14a-103 | May 20, 2025 Name of Registrant: Southern Company Name of person relying on exemption: Bowyer Research Address of person relying on exemption: P.

Southern Company announces offering of $1.25 billion in aggregate principal amount of Convertible Senior Notes due June 15, 2028

Exhibit 99.1 News Media Contact: Southern Company Media Relations 404-506-5333 or 1-866-506-5333 Investor Relations Contact: Greg MacLeod 404-685-4194 [email protected] Southern Company announces offering of $1.25 billion in aggregate principal amount of Convertible Senior Notes due June 15, 2028 ATLANTA, May 20, 2025 – Southern Company (NYSE: SO) today announced an offering of $1.25 billion

Other Events

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) May 19, 2025 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A Delaw

United States Securities and Exchange Commission Washington, D.C. 20549 NOTICE OF EXEMPT SOLICITATION Pursuant to Rule 14a-103

United States Securities and Exchange Commission Washington, D.C. 20549 NOTICE OF EXEMPT SOLICITATION Pursuant to Rule 14a-103 Name of the Registrant: Southern Co Name of persons relying on exemption: Inspire Investing, LLC Address of persons relying on exemption: 3597 E Monarch Sky Ln, Suite 330, Meridian, ID 83646 Written materials are submitted pursuant to Rule 14a-6(g) (1) promulgated under th

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) ☑ Filed by the Registrant ☐ Filed by a party other than the Registrant CHECK THE APPROPRIATE BOX: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defin

Certificate of Mississippi Power's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(d)1 MISSISSIPPI POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Anthony L.

Certificate of Alabama Power's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(b) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Alabama Power Company for the quarter ended March 31, 2025, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the be

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

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) May 1, 2025 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A Delawa

Certificate of Southern Company's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a)1 THE SOUTHERN COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Christopher C.

Certificate of Alabama Power's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(b)2 ALABAMA POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Moses H.

Certificate of Southern Company's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(a) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of The Southern Company for the quarter ended March 31, 2025, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the bes

Certificate of Southern Power Company's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(e) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Southern Power Company for the quarter ended March 31, 2025, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the b

Certificate of Georgia Power's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(c)2 GEORGIA POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Aaron P.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 ☐ TRANSITION REPORT PURSUANT TO

Table of Contents Index to Financial Statements UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Certificate of Georgia Power's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(c)1 GEORGIA POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Kimberly S.

Certificate of Southern Company Gas' Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(f)1 SOUTHERN COMPANY GAS CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, James Y.

Certificate of Alabama Power's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(b)1 ALABAMA POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, J.

Southern Company reports first-quarter 2025 earnings

Exhibit 99 Page 1 News Media Contact: Southern Company Media Relations 404-506-5333 or 1-866-506-5333 southerncompany.

Certificate of Southern Company Gas' Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(f) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Southern Company Gas for the quarter ended March 31, 2025, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the bes

Certificate of Southern Company's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a)2 THE SOUTHERN COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Daniel S.

Certificate of Southern Power Company's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(e)1 SOUTHERN POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Christopher Cummiskey, certify that: 1.

Certificate of Georgia Power's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(c) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Georgia Power Company for the quarter ended March 31, 2025, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the be

Supplemental Indenture to Senior Note Indenture dated as of March 28, 2025, providing for the issuance of the Series 2025

Exhibit 4(d)2 MISSISSIPPI POWER COMPANY TO REGIONS BANK, TRUSTEE SEVENTH SUPPLEMENTAL INDENTURE DATED AS OF MARCH 28, 2025 SERIES 2025B 6.

Certificate of Mississippi Power's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(d) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Mississippi Power Company for the quarter ended March 31, 2025, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to th

, 2025, providing for the issuance of the Series 2025A

Exhibit 4(d)1 MISSISSIPPI POWER COMPANY TO REGIONS BANK, TRUSTEE SIXTH SUPPLEMENTAL INDENTURE DATED AS OF MARCH 28, 2025 SERIES 2025A 5.

Certificate of Southern Company Gas' Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(f)2 SOUTHERN COMPANY GAS CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Grace A.

Certificate of Southern Power Company's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(e)2 SOUTHERN POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Gary Kerr, certify that: 1.

Certificate of Mississippi Power's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(d)2 MISSISSIPPI POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Matthew P.

Notice of Exempt Solicitation Pursuant to Rule 14a-103 Name of Registrant: Southern Co (SO) Name of person relying on exemption: As You Sow® Address of persons relying on exemption: 11461 San Pablo Ave, Suite 400, El Cerrito, CA 94530 The attached wr

Notice of Exempt Solicitation Pursuant to Rule 14a-103 Name of Registrant: Southern Co (SO) Name of person relying on exemption: As You Sow® Address of persons relying on exemption: 11461 San Pablo Ave, Suite 400, El Cerrito, CA 94530 The attached written materials are submitted pursuant to Rule 14a-6(g)(1) promulgated under the Securities Exchange Act of 1934.

Notice of Exempt Solicitation Pursuant to Rule 14a-103

Notice of Exempt Solicitation Pursuant to Rule 14a-103 Name of Registrant: The Southern Company (SO) Name of person relying on exemption: John Chevedden, SO Shareholder since 2012 Address of persons relying on exemption: POB 2673, Redondo Beach, CA 90278 These written materials are submitted pursuant to Rule 14a-6(g)(1) promulgated under the Securities Exchange Act of 1934.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) ☑ Filed by the Registrant ☐ Filed by a party other than the Registrant CHECK THE APPROPRIATE BOX: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defin

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) ☑ Filed by the Registrant ☐ Filed by a party other than the Registrant CHECK THE APPROPRIATE BOX: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☑ Defin

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) ☑ Filed by the Registrant ☐ Filed by a party other than the Registrant CHECK THE APPROPRIATE BOX: ☑ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defin

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

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) February 25, 2025 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A

, File No. 1-3526 as Exhibit 4.

Exhibit 4.4 THE SOUTHERN COMPANY TO COMPUTERSHARE TRUST COMPANY, N.A., TRUSTEE SIXTEENTH SUPPLEMENTAL INDENTURE DATED AS OF FEBRUARY 28, 2025 $1,800,000,000 SERIES 2025B 6.375% FIXED-TO-FIXED RESET RATE JUNIOR SUBORDINATED NOTES DUE MARCH 15, 2055 TABLE OF CONTENTS1 PAGE ARTICLE 1 1 SECTION 101. Establishment 1 SECTION 102. Definitions 2 SECTION 103. Payment of Principal and Interest 4 SECTION 104

Barclays Capital Inc., Citigroup Global Markets Inc., Mizuho Securities USA LLC, MUFG Securities Americas Inc., PNC Capital Markets LLC and Truist Securities, Inc.

Exhibit 1.3 $1,800,000,000 Series 2025B 6.375% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due March 15, 2055 THE SOUTHERN COMPANY UNDERWRITING AGREEMENT February 25, 2025 Barclays Capital Inc. 745 Seventh Avenue New York, New York 10019 Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 Mizuho Securities USA LLC 1271 Avenue of the Americas New York, New York 10020

$1,800,000,000 Series 2025B 6.375% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due March 15, 2055

Filed Pursuant to Rule 424(b)(2) Registration No. 333-277138 PROSPECTUS SUPPLEMENT (To Prospectus dated February 16, 2024) $1,800,000,000 Series 2025B 6.375% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due March 15, 2055 The Series 2025B 6.375% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due March 15, 2055 (the “Series 2025B Junior Subordinated Notes”) will bear interest (i) from a

Table 1: Newly Registered and Carry Forward Securities

Calculation of Filing Fee Tables S-3 SOUTHERN CO Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Debt Series 2025B 6.

SUBJECT TO COMPLETION PRELIMINARY PROSPECTUS SUPPLEMENT DATED FEBRUARY 25, 2025

Filed Pursuant to Rule 424(b)(5) Registration No. 333-277138 This Preliminary Prospectus Supplement and the accompanying Prospectus relate to an effective registration statement under the Securities Act of 1933, as amended, but the Preliminary Prospectus Supplement is not complete and may be changed. This Preliminary Prospectus Supplement and the accompanying Prospectus are not an offer to sell th

* Note: A securities rating is not a recommendation to buy, sell or hold securities and may be subject to revision or withdrawal at any time. The terms “Five-Year Treasury Rate,” “Interest Reset Date,” “Interest Reset Period,” “Rating Agency Event,”

Filed Pursuant to Rule 433 Registration No. 333-277138 February 25, 2025 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated February 25, 2025) Issuer: The Southern Company Security: Series 2025B 6.375% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due March 15, 2055 Format: SEC Registered Trade Date: February 25, 2025 Expected Settlement Date: February 28, 2025 (T+3) Expected Rat

Certificate of Southern Company Gas' Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(f)1 SOUTHERN COMPANY GAS CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, James Y.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31, 2024 ☐ TRANSITION REPORT PURSUANT TO SECTI

Table of Contents Index to Financial Statements UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Power of Attorney and resolution

Exhibit 24(d)1 October 23, 2024 Mr. Daniel S. Tucker The Southern Company 30 Ivan Allen Jr. Blvd., NW Atlanta, GA 30308 Ms. Melissa K. Caen Southern Company Services, Inc. 30 Ivan Allen Jr. Blvd., NW Atlanta, GA 30308 Mr. Tucker and Ms. Caen: Mississippi Power Company (the “Company”) proposes to file or join in the filing of reports under the Securities Exchange Act of 1934, as amended, with the S

Consent of Deloitte & Touche LLP

Exhibit 23(f)1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We consent to the incorporation by reference in Registration Statement No.

Certificate of Mississippi Power's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(d) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Annual Report on Form 10-K of Mississippi Power Company for the year ended December 31, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the b

Results of Operations and Financial Condition

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) February 20, 2025 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A

Certificate of Alabama Power's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b)2 ALABAMA POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Moses H.

Certificate of Southern Company Gas' Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(f)2 SOUTHERN COMPANY GAS CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Grace A.

Southern Company reports fourth-quarter and full-year 2024 earnings

Exhibit 99 Page 1 News Media Contact: Southern Company Media Relations 404-506-5333 or 1-866-506-5333 southerncompany.

rohibition of Securities Trading Po

Exhibit 19(a) Policy Statement: This policy sets forth rules to follow with respect to securities trading and pre-clearance.

Subsidiaries of Registrant

Exhibit 21(a) Subsidiaries of the Registrant(1) Name of Company Jurisdiction of Organization The Southern Company Delaware Alabama Power Company Alabama Alabama Property Company Alabama Southern Electric Generating Company Alabama Georgia Power Company Georgia Piedmont-Forrest Corporation Georgia Southern Electric Generating Company Alabama Mississippi Power Company Mississippi Southern Power Comp

Certificate of Southern Company's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a)1 THE SOUTHERN COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Christopher C.

Certificate of Georgia Power's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(c)1 GEORGIA POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Kimberly S.

Certificate of Alabama Power's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(b) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Annual Report on Form 10-K of Alabama Power Company for the year ended December 31, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best

Certificate of Southern Company's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(a) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Annual Report on Form 10-K of The Southern Company for the year ended December 31, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best o

Certificate of Southern Company Gas' Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(f) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Annual Report on Form 10-K of Southern Company Gas for the year ended December 31, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best o

Power of Attorney and resolution

Exhibit 24(a)1 December 9, 2024 Laura O. Hewett and Melissa K. Caen Ms. Hewett and Ms. Caen: The Southern Company (the “Company”) proposes to file or join in the filing of reports under the Securities Exchange Act of 1934, as amended, with the Securities and Exchange Commission with respect to the following: (1) the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 and (2)

Power of Attorney and resolution

Exhibit 24(f)1 December 11, 2024 Laura O. Hewett and Melissa K. Caen Ms. Hewett and Ms. Caen: Southern Company Gas (the “Company”) proposes to file or join in the filing of reports under the Securities Exchange Act of 1934, as amended, with the Securities and Exchange Commission with respect to the following: (1) the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 and (2)

Certificate of Georgia Power's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(c) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Annual Report on Form 10-K of Georgia Power Company for the year ended December 31, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best

Consent of Deloitte & Touche LLP

Exhibit 23(a)1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We consent to the incorporation by reference in Registration Statement Nos.

Certificate of Southern Power Company's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(e)2 SOUTHERN POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Gary Kerr, certify that: 1.

rohibition of Securities Trading Policy

Exhibit 19(f) Policy Statement: This policy sets forth rules to follow with respect to securities trading and pre-clearance.

Certificate of Southern Power Company's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(e) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Annual Report on Form 10-K of Southern Power Company for the year ended December 31, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best

Certificate of Alabama Power's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b)1 ALABAMA POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, J.

Power of Attorney and resolution

Exhibit 24(c)1 November 20, 2024 Aaron P. Abramovitz, Daniel S. Tucker and Melissa K. Caen Gentlemen and Ms. Caen: Georgia Power Company (the “Company”) proposes to file or join in the filing of reports under the Securities Exchange Act of 1934, as amended, with the Securities and Exchange Commission with respect to the following: (1) the Company’s Annual Report on Form 10-K for the year ended Dec

Certificate of Southern Company's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a)2 THE SOUTHERN COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Daniel S.

rohibition of Securities Trading Policy

Exhibit 19(e) Policy Statement: This policy sets forth rules to follow with respect to securities trading and pre-clearance.

rohibition of Securities Tradin

Exhibit 19(c) Georgia Power Company Prohibition of Securities Trading Policy Policy Statement: This policy sets forth rules to follow with respect to securities trading and pre-clearance.

Consent of Deloitte & Touche LLP.

Exhibit 23(e)1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We consent to the incorporation by reference in Registration Statement No.

Consent of Deloitte & Touche LLP.

Exhibit 23(d)1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We consent to the incorporation by reference in Registration Statement No.

rohibition of Securities Trading Policy

Exhibit 19(d) Prohibition of Securities Trading Policy Policy Statement: This policy sets forth rules to follow with respect to securities trading and pre-clearance.

Power of Attorney and resolution

Exhibit 24(b)1 600 North 18th Street Post Office Box 2641 Birmingham, Alabama 35291-0001 Tel 205 257 1000 January 24, 2025 Daniel S.

, dated December 16, 2024

Exhibit 10(a)13 NINTH AMENDMENT TO THE SOUTHERN COMPANY EMPLOYEE SAVINGS PLAN WHEREAS, Southern Company Services, Inc.

Certificate of Mississippi Power's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(d)2 MISSISSIPPI POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Matthew P.

Power of Attorney and resolution

Exhibit 24(e)1 November 13, 2024 Mr. Gary Kerr Southern Power Company 3535 Colonnade Parkway Birmingham, AL 35243 Mr. D. Matt Madison Southern Power Company 3535 Colonnade Parkway Birmingham, AL 35243 Ms. Melissa K. Caen Southern Company Services, Inc. 30 Ivan Allen Jr. Blvd, NW Atlanta, GA 30308 Mr. Kerr, Mr. Madison and Ms. Caen: Southern Power Company (the “Company”) proposes to file or join in

Prohibition of Securities Trading Policy

Exhibit 19(b) Prohibition of Securities Trading Policy Policy Statement: This policy sets forth rules to follow with respect to securities trading and pre-clearance.

Consent of BDO USA, P.C.

Exhibit 23(f)2 Consent of Independent Registered Public Accounting Firm We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (No.

Certificate of Mississippi Power's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(d)1 MISSISSIPPI POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Anthony L.

Certificate of Georgia Power's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(c)2 GEORGIA POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Aaron P.

Certificate of Southern Power Company's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(e)1 SOUTHERN POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Christopher Cummiskey, certify that: 1.

Consent of Deloitte & Touche LLP

Exhibit 23(b)1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We consent to the incorporation by reference in Registration Statement No.

Southern Company Deferred Compensation Plan, Amended and Restated as of January 1,

Exhibit 10(a)2 SOUTHERN COMPANY DEFERRED COMPENSATION PLAN Amended and Restated as of January 1, 2025 SOUTHERN COMPANY DEFERRED COMPENSATION PLAN TABLE OF CONTENTS ARTICLE I Purpose and Adoption of Plan 1 ARTICLE II Descriptions 2 ARTICLE III Administration of Plan 5 ARTICLE IV Eligibility 7 ARTICLE V Deferral Election 8 ARTICLE VI Participants' Accounts 9 ARTICLE VII Account Distribution 11 ARTICLE VIII Miscellaneous Provisions 13 SOUTHERN COMPANY DEFERRED COMPENSATION PLAN ARTICLE I Purpose and Adoption of Plan 1.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

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) February 11, 2025 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D. C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) December 5, 2024 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Com

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D. C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) or (g) OF THE SECURITIES EXCHANGE ACT OF 1934 THE SOUTHERN COMPANY (Exact name of registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D. C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) or (g) OF THE SECURITIES EXCHANGE ACT OF 1934 THE SOUTHERN COMPANY (Exact name of registrant as specified in its charter) Delaware 58-0690070 (State of incorporation or organization) (IRS Employer Identification No.) 30 Ivan Allen Jr. Bouleva

Financial Statements and Exhibits, Other Events

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) January 8, 2025 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A De

, 2025, File No. 1-3526, as Exhibit 4.4

Exhibit 4.4 THE SOUTHERN COMPANY TO COMPUTERSHARE TRUST COMPANY, N.A., TRUSTEE FIFTEENTH SUPPLEMENTAL INDENTURE DATED AS OF JANUARY 13, 2025 $565,000,000 SERIES 2025A 6.50% JUNIOR SUBORDINATED NOTES DUE MARCH 15, 2085 TABLE OF CONTENTS1 PAGE ARTICLE 1 1 SECTION 101. Establishment 1 SECTION 102. Definitions 2 SECTION 103. Payment of Principal and Interest 3 SECTION 104. Deferral of Interest Payment

BofA Securities, Inc., J.P. Morgan Securities LLC, Morgan Stanley & Co. LLC, RBC Capital Markets, LLC and Wells Fargo Securities, LLC

Exhibit 1.3 $500,000,000 Series 2025A 6.50% Junior Subordinated Notes due March 15, 2085 THE SOUTHERN COMPANY UNDERWRITING AGREEMENT January 8, 2025 BofA Securities, Inc. One Bryant Park New York, New York 10036 J.P. Morgan Securities LLC 383 Madison Avenue New York, New York 10179 Morgan Stanley & Co. LLC 1585 Broadway New York, New York 10036 RBC Capital Markets, LLC Brookfield Place 200 Vesey S

$500,000,000 Series 2025A 6.50% Junior Subordinated Notes due March 15, 2085

424B2 1 so2025ajsnfinalprosuppfixe.htm 424B2 Filed Pursuant to Rule 424(b)(2) Registration No. 333-277138 PROSPECTUS SUPPLEMENT (To Prospectus dated February 16, 2024) $500,000,000 Series 2025A 6.50% Junior Subordinated Notes due March 15, 2085 The Series 2025A 6.50% Junior Subordinated Notes due March 15, 2085 (the “Series 2025A Junior Subordinated Notes”) will bear interest at a fixed rate of 6.

Table 1: Newly Registered and Carry Forward Securities

Calculation of Filing Fee Tables S-3 SOUTHERN CO Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Debt Series 2025A 6.

SUBJECT TO COMPLETION PRELIMINARY PROSPECTUS SUPPLEMENT DATED JANUARY 8, 2025

Filed Pursuant to Rule 424(b)(5) Registration No. 333-277138 This Preliminary Prospectus Supplement and the accompanying Prospectus relate to an effective registration statement under the Securities Act of 1933, as amended, but the Preliminary Prospectus Supplement is not complete and may be changed. This Preliminary Prospectus Supplement and the accompanying Prospectus are not an offer to sell th

* Note: A securities rating is not a recommendation to buy, sell or hold securities and may be subject to revision or withdrawal at any time. The terms “Rating Agency Event” and “Tax Event” have the meanings ascribed to them in the issuer’s Prelimina

Filed Pursuant to Rule 433 Registration No. 333-277138 January 8, 2025 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated January 8, 2025) Issuer: The Southern Company Security: Series 2025A 6.50% Junior Subordinated Notes due March 15, 2085 Format: SEC Registered Trade Date: January 8, 2025 Expected Settlement Date: January 13, 2025 (T+3) Listing: Expect to apply to list on the New Yo

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

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) December 5, 2024 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A D

Certificate of Southern Company Gas' Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(f)1 SOUTHERN COMPANY GAS CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, James Y.

Certificate of Georgia Power's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(c)1 GEORGIA POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Kimberly S.

Certificate of Southern Power Company's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(e) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Southern Power Company for the quarter ended September 30, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to t

Certificate of Southern Company Gas' Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(f)2 SOUTHERN COMPANY GAS CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Grace A.

Certificate of Georgia Power's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(c)2 GEORGIA POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Aaron P.

Certificate of Georgia Power's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(c) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Georgia Power Company for the quarter ended September 30, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to th

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 ☐ TRANSITION REPORT PURSUANT

Table of Contents Index to Financial Statements UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Certificate of Southern Company's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a)2 THE SOUTHERN COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Daniel S.

Certificate of Southern Power Company's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(e)1 SOUTHERN POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Christopher Cummiskey, certify that: 1.

Certificate of Mississippi Power's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(d)1 MISSISSIPPI POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Anthony L.

Certificate of Southern Company's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(a) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of The Southern Company for the quarter ended September 30, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the

Certificate of Southern Company's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(a)1 THE SOUTHERN COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Christopher C.

Results of Operations and Financial Condition

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 31, 2024 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A D

Certificate of Mississippi Power's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(d)2 MISSISSIPPI POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Matthew P.

Certificate of Alabama Power's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b)1 ALABAMA POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, J.

as of August 13, 2024 of Northern Illinois G

Exhibit 4(f)3 When recorded return to: Michael M. Roth, Esq. Ice Miller LLP 2300 Cabot Drive Suite 455 Lisle, IL 60532 Space Above this Line Reserved for Recorder’s Use Only Supplemental Indenture Made as of August 13, 2024, to be Effective September 4, 2024 Northern Illinois Gas Company to U.S. Bank Trust Company, National Association Trustee under Indenture dated as of January 1, 1954 and Supple

Certificate of Alabama Power's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(b) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Alabama Power Company for the quarter ended September 30, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to th

Certificate of Southern Company Gas' Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(f) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Southern Company Gas for the quarter ended September 30, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the

Certificate of Mississippi Power's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(d) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Mississippi Power Company for the quarter ended September 30, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, t

Certificate of Southern Power Company's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(e)2 SOUTHERN POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Gary Kerr, certify that: 1.

Certificate of Alabama Power's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b)2 ALABAMA POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Moses H.

Southern Company reports third-quarter 2024 earnings

Exhibit 99 Page 1 News Media Contact: Southern Company Media Relations 404-506-5333 or 1-866-506-5333 southerncompany.

, as representatives of the several Underwriters named in Schedule I thereto

Exhibit 1.2 $750,000,000 Series 2024B 4.85% Senior Notes due 2035 THE SOUTHERN COMPANY UNDERWRITING AGREEMENT September 4, 2024 BofA Securities, Inc. One Bryant Park New York, New York 10036 Mizuho Securities USA LLC 1271 Avenue of the Americas New York, New York 10020 Morgan Stanley & Co. LLC 1585 Broadway New York, New York 10036 PNC Capital Markets LLC 300 Fifth Avenue, 10th Floor Pittsburgh, P

Financial Statements and Exhibits, Other Events

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) September 4, 2024 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A

, 2024, File No. 1-3526 as Exhibit 4.2.

Exhibit 4.2 THE SOUTHERN COMPANY TO COMPUTERSHARE TRUST COMPANY, N.A., TRUSTEE THIRTY-THIRD SUPPLEMENTAL INDENTURE DATED AS OF SEPTEMBER 9, 2024 SERIES 2024B 4.85% SENIOR NOTES DUE MARCH 15, 2035 TABLE OF CONTENTS1 ARTICLE 1 SERIES 2024B SENIOR NOTES Page SECTION 101. Establishment 1 SECTION 102. Definitions 2 SECTION 103. Payment of Principal and Interest 3 SECTION 104. Denominations 4 SECTION 10

Table 1: Newly Registered and Carry Forward Securities

Calculation of Filing Fee Tables S-3 SOUTHERN CO Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Debt Series 2024B 4.

$750,000,000 Series 2024B 4.85% Senior Notes due March 15, 2035

Filed Pursuant to Rule 424(b)(2) Registration No. 333-277138 PROSPECTUS SUPPLEMENT (To Prospectus dated February 16, 2024) $750,000,000 Series 2024B 4.85% Senior Notes due March 15, 2035 This is a public offering by The Southern Company of $750,000,000 of Series 2024B 4.85% Senior Notes due March 15, 2035 (the “Series 2024B Senior Notes”). Interest on the Series 2024B Senior Notes is payable semia

(To Preliminary Prospectus Supplement dated September 4, 2024)

Filed Pursuant to Rule 433 Registration No. 333-277138 September 4, 2024 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated September 4, 2024) Issuer: The Southern Company Security: Series 2024B 4.85% Senior Notes due March 15, 2035 Expected Ratings:* Baa2 (Positive)/BBB+ (Stable)/BBB+ (Stable) (Moody’s/Standard & Poor’s/Fitch) Principal Amount: $750,000,000 Initial Public Offering Pri

SUBJECT TO COMPLETION PRELIMINARY PROSPECTUS SUPPLEMENT DATED SEPTEMBER 4, 2024

Filed Pursuant to Rule 424(b)(5) Registration No. 333-277138 This Preliminary Prospectus Supplement and the accompanying Prospectus relate to an effective registration statement under the Securities Act of 1933, as amended, but the Preliminary Prospectus Supplement is not complete and may be changed. This Preliminary Prospectus Supplement and the accompanying Prospectus are not an offer to sell th

Certificate of Mississippi Power's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(d)1 MISSISSIPPI POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Anthony L.

Southern Company reports second-quarter 2024 earnings

Exhibit 99 Page 1 News Media Contact: Southern Company Media Relations 404-506-5333 or 1-866-506-5333 southerncompany.

Supplemental Indenture to Senior Note Indenture dated as of

Exhibit 4(d)1 MISSISSIPPI POWER COMPANY TO REGIONS BANK, TRUSTEE FIFTH SUPPLEMENTAL INDENTURE DATED AS OF JUNE 27, 2024 SERIES 2024C 5.

Certificate of Southern Company Gas' Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(f)2 SOUTHERN COMPANY GAS CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Grace A.

Certificate of Mississippi Power's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(d) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Mississippi Power Company for the quarter ended June 30, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the

Certificate of Alabama Power's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(b)1 ALABAMA POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, J.

Certificate of Southern Company Gas' Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(f) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Southern Company Gas for the quarter ended June 30, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best

Results of Operations and Financial Condition

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) August 1, 2024 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A Del

Certificate of Southern Power Company's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(e)2 SOUTHERN POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Gary Kerr, certify that: 1.

Certificate of Georgia Power's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(c)2 GEORGIA POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Aaron P.

Certificate of Mississippi Power's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(d)2 MISSISSIPPI POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Matthew P.

Certificate of Southern Power Company's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(e)1 SOUTHERN POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Christopher Cummiskey, certify that: 1.

Certificate of Alabama Power's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b)2 ALABAMA POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Moses H.

Certificate of Southern Company Gas' Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(f)1 SOUTHERN COMPANY GAS CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, James Y.

Certificate of Alabama Power's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(b) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Alabama Power Company for the quarter ended June 30, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the bes

Certificate of Georgia Power's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(c) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Georgia Power Company for the quarter ended June 30, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the bes

Certificate of Southern Company's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a)1 THE SOUTHERN COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Christopher C.

Certificate of Southern Power Company's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(e) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Southern Power Company for the quarter ended June 30, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the be

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 ☐ TRANSITION REPORT PURSUANT TO S

Table of Contents Index to Financial Statements UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Certificate of Southern Company's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a)2 THE SOUTHERN COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Daniel S.

Certificate of Georgia Power's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(c)1 GEORGIA POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Kimberly S.

Certificate of Southern Company's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(a) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of The Southern Company for the quarter ended June 30, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K FOR ANNUAL REPORTS OF EMPLOYEE STOCK PURCHASE, SAVINGS AND SIMILAR PLANS PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 [X] ANNUAL REPORT PURSUANT TO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K FOR ANNUAL REPORTS OF EMPLOYEE STOCK PURCHASE, SAVINGS AND SIMILAR PLANS PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 [X] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF

Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

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) May 22, 2024 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A Delaw

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report THE SOUTHERN COMPANY (Exact name of registrant as specified in its charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report THE SOUTHERN COMPANY (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation or organization) 1-3526 (Commission File Number) 58-0690070 (IRS Employer Identification No.) 30 Ivan Allen Jr. Blvd., N.W. Atlanta, Georgia (Address of princi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) ☑ Filed by the Registrant ☐ Filed by a party other than the Registrant CHECK THE APPROPRIATE BOX: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defin

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

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) May 7, 2024 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A Delawa

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

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) May 9, 2024 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A Delawa

, 2024, File No. 1-3526 as Exhibit 4.2.

Exhibit 4.2 THE SOUTHERN COMPANY TO COMPUTERSHARE TRUST COMPANY, N.A., TRUSTEE THIRTY-SECOND SUPPLEMENTAL INDENTURE DATED AS OF MAY 9, 2024 SERIES 2024A 4.50% CONVERTIBLE SENIOR NOTES DUE JUNE 15, 2027 TABLE OF CONTENTS1 PAGE ARTICLE 1 Series 2024A Convertible Senior Notes 2 SECTION 1.01. Establishment 2 SECTION 1.02. Definitions 2 SECTION 1.03. Payment of Principal and Interest 9 SECTION 1.04. De

Financial Statements and Exhibits, Other Events

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) May 6, 2024 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A Delawa

Southern Company announces upsize and pricing of $1.3 billion in aggregate principal amount of Series 2024A 4.50% Convertible Senior Notes due June 15,

Exhibit 99.1 Media Contact: Southern Company Media Relations 404-506-5333 or 1-866-506-5333 www.southerncompany.com Investor Relations Contact: Scott Gammill 404-506-0901 [email protected] Southern Company announces upsize and pricing of $1.3 billion in aggregate principal amount of Series 2024A 4.50% Convertible Senior Notes due June 15, 2027 ATLANTA, May 6, 2024 – Southern Company (NYSE: S

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

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) May 6, 2024 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A Delawa

Southern Company announces offering of $1.1 billion in aggregate principal amount of Convertible Senior Notes due June 15, 2027

Exhibit 99.1 Media Contact: Southern Company Media Relations 404-506-5333 or 1-866-506-5333 www.southerncompany.com Investor Relations Contact: Scott Gammill 404-506-0901 [email protected] Southern Company announces offering of $1.1 billion in aggregate principal amount of Convertible Senior Notes due June 15, 2027 ATLANTA, May 6, 2024 – Southern Company (NYSE: SO) today announced an offerin

ee Table

Exhibit 107.1 Calculation of Filing Fee Tables Form S-8 (Form Type) The Southern Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered(1) Proposed Maximum Offering Price Per Unit(2) Maximum Aggregate Offering Price(2) Fee Rate Amount of Registration Fee Equity The Southern Compan

As filed with the Securities and Exchange Commission on May 3, 2024

As filed with the Securities and Exchange Commission on May 3, 2024 Registration No.

Power of Attorney and Resolution

Exhibit 24.1 April 22, 2024 Christopher C. Womack, Daniel S. Tucker and Melissa K. Caen Gentlemen and Ms. Caen: The Southern Company (the “Company”) proposes to file with the Securities and Exchange Commission a registration statement or statements under the Securities Act of 1933, as amended, with respect to the issuance and sale by the Company of additional shares of its common stock under The S

Equity Distribution Agreement dated as of May 3, 2024 among the Company, each Sales Agent and each Forward Purchaser.

Exhibit 1.4 DISTRIBUTION AGREEMENT May 3, 2024 Barclays Capital Inc. 745 Seventh Avenue New York, New York 10019 Barclays Bank PLC 745 Seventh Avenue New York, New York 10019 BofA Securities, Inc. One Bryant Park New York, New York 10036 Bank of America, N.A. One Bryant Park New York, New York 10036 Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 Citibank, N.A. 390 Gree

50,000,000 Shares Common Stock

Filed Pursuant to Rule 424(b)2 File No. 333-277138 Prospectus Supplement (to Prospectus dated February 16, 2024) 50,000,000 Shares Common Stock The Southern Company (the “Company”) may offer and sell not to exceed 50,000,000 shares of its common stock from time to time through the sales agents named below under an equity distribution agreement. The equity distribution agreement provides that, in a

Financial Statements and Exhibits, Other Events

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) May 3, 2024 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A Delawa

Calculation of Filing Fee Tables Form 424(b)(2) (Form Type) The Southern Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Tables Form 424(b)(2) (Form Type) The Southern Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 ☐ TRANSITION REPORT PURSUANT TO

Table of Contents Index to Financial Statements UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Certificate of Southern Company Gas' Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(f)2 SOUTHERN COMPANY GAS CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Grace A.

Certificate of Alabama Power's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(b) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Alabama Power Company for the quarter ended March 31, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the be

NOTICE OF EXEMPT SOLICITATION

NOTICE OF EXEMPT SOLICITATION Name of the registrant: Southern Company Name of person relying on exemption: New York State Comptroller Thomas P.

Certificate of Southern Power Company's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(e)1 SOUTHERN POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Christopher Cummiskey, certify that: 1.

Results of Operations and Financial Condition

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) May 2, 2024 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A Delawa

Certificate of Georgia Power's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(c)2 GEORGIA POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Aaron P.

Certificate of Mississippi Power's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(d) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Mississippi Power Company for the quarter ended March 31, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to th

Certificate of Southern Company's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(a) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of The Southern Company for the quarter ended March 31, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the bes

Certificate of Southern Power Company's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(e)2 SOUTHERN POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Gary Kerr, certify that: 1.

Fourth Supplemental Indenture to Senior Note Indenture dated as of March 27, 2024, providing for the issuance of the Series 2024B 5.72% Senior Notes due March 15, 2036.

Exhibit 4(d)2 MISSISSIPPI POWER COMPANY TO REGIONS BANK, TRUSTEE FOURTH SUPPLEMENTAL INDENTURE DATED AS OF MARCH 27, 2024 SERIES 2024B 5.

Certificate of Southern Company Gas' Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(f)1 SOUTHERN COMPANY GAS CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, James Y.

Certificate of Alabama Power's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(b)1 ALABAMA POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, J.

Certificate of Southern Power Company's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(e) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Southern Power Company for the quarter ended March 31, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the b

Certificate of Southern Company's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a)1 THE SOUTHERN COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Christopher C.

Certificate of Mississippi Power's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(d)2 MISSISSIPPI POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Matthew P.

Certificate of Alabama Power's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(b)2 ALABAMA POWER COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Moses H.

Third Supplemental Indenture to Senior Note Indenture dated as of March 27, 2024, providing for the issuance of the Series 2024A 5.62% Senior Notes due March 15, 2034.

Exhibit 4(d)1 MISSISSIPPI POWER COMPANY TO REGIONS BANK, TRUSTEE THIRD SUPPLEMENTAL INDENTURE DATED AS OF MARCH 27, 2024 SERIES 2024A 5.

Certificate of Georgia Power's Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32(c) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Georgia Power Company for the quarter ended March 31, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the be

Certificate of Mississippi Power's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(d)1 MISSISSIPPI POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Anthony L.

Certificate of Southern Company's Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a)2 THE SOUTHERN COMPANY CERTIFICATION OF CHIEF FINANCIAL OFFICER I, Daniel S.

Certificate of Southern Company Gas' Chief Executive Officer and Chief Financial Officer required by Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(f) CERTIFICATION 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Quarterly Report on Form 10-Q of Southern Company Gas for the quarter ended March 31, 2024, we, the undersigned, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the bes

Southern Company reports first-quarter 2024 earnings

Exhibit 99 Page 1 News Media Contact: Southern Company Media Relations 404-506-5333 or 1-866-506-5333 southerncompany.

Certificate of Georgia Power's Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31(c)1 GEORGIA POWER COMPANY CERTIFICATION OF CHIEF EXECUTIVE OFFICER I, Kimberly S.

Other Events

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) April 29, 2024 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A Del

The Southern Company Vote FOR: Proxy Ballot Item #6 “Disclose Short-, Medium- and Long-Term Operational GHG Targets” Annual Meeting: May 22, 2024

The Southern Company Vote FOR: Proxy Ballot Item #6 “Disclose Short-, Medium- and Long-Term Operational GHG Targets” Annual Meeting: May 22, 2024 CONTACT: Christopher Richardson, Mercy Investment Services | crichardson@Mercyinvestments.

DEFINITIVE PROXY STATEMENT

Proxy Statement 2024 Notice of Annual Meeting of Stockholders &Our Company 44,000 MW of generating capacity Capabilities in 50 States 9 million Customers More than 28,000 Employees 7 Electric & natural gas utilities Major Subsidiaries 1.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) ☑ Filed by the Registrant ☐ Filed by a party other than the Registrant CHECK THE APPROPRIATE BOX: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) ☑ Filed by the Registrant ☐ Filed by a party other than the Registrant CHECK THE APPROPRIATE BOX: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defin

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) ☑ Filed by the Registrant ☐ Filed by a party other than the Registrant CHECK THE APPROPRIATE BOX: ☑ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14

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

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) February 26, 2024 Commission File Number Registrant, State of Incorporation, Address and Telephone Number I.R.S. Employer Identification No. 1-3526 The Southern Company 58-0690070 (A

Opinion of Troutman Pepper Hamilton Sanders LLP relating to the

Exhibit 5.1(b) [Letterhead of Troutman Pepper Hamilton Sanders LLP] February 28, 2024 The Southern Company 30 Ivan Allen Jr. Blvd., N.W. Atlanta, Georgia 30308 Re: Registration Statement on Form S-3 Ladies and Gentlemen: We have acted as counsel to The Southern Company (the “Company”) in connection with the above-referenced Registration Statement on Form S-3 (Registration Statement No. 333-277138)

BofA Securities, Inc., Morgan Stanley & Co. LLC, RBC Capital Markets, LLC, Scotia Capital (USA) Inc. and U.S. Bancorp Investme

Exhibit 1.3(a) $400,000,000 Series 2023D 5.50% Senior Notes due 2029 THE SOUTHERN COMPANY UNDERWRITING AGREEMENT February 26, 2024 BofA Securities, Inc. One Bryant Park New York, New York 10036 Morgan Stanley & Co. LLC 1585 Broadway New York, New York 10036 RBC Capital Markets, LLC Brookfield Place 200 Vesey Street, 8th Floor New York, New York 10281 Scotia Capital (USA) Inc. 250 Vesey Street New

Opinion of Troutman Pepper Hamilton Sanders LLP relating to the

Exhibit 5.1(a) [Letterhead of Troutman Pepper Hamilton Sanders LLP] February 28, 2024 The Southern Company 30 Ivan Allen Jr. Blvd., N.W. Atlanta, Georgia 30308 Re: Registration Statement on Form S-3 Ladies and Gentlemen: We have acted as counsel to The Southern Company (the “Company”) in connection with the above-referenced Registration Statement on Form S-3 (Registration Statement No. 333-277138)

Tax Opinion of Troutman Pepper Hamilton Sanders LLP relating to the

Exhibit 8.1(a) [Letterhead of Troutman Pepper Hamilton Sanders LLP] February 28, 2024 The Southern Company 30 Ivan Allen Jr. Boulevard, N.W. Atlanta, Georgia 30308 Re: Registration Statement on Form S-3 Ladies and Gentlemen: We have acted as counsel to The Southern Company, a Delaware corporation (the “Company”), in connection with the Registration Statement on Form S-3 (Registration Statement No.

Tax Opinion of Troutman Pepper Hamilton Sanders LLP relating to the

Exhibit 8.1(b) [Letterhead of Troutman Pepper Hamilton Sanders LLP] February 28, 2024 The Southern Company 30 Ivan Allen Jr. Boulevard, N.W. Atlanta, Georgia 30308 Re: Registration Statement on Form S-3 Ladies and Gentlemen: We have acted as counsel to The Southern Company, a Delaware corporation (the “Company”), in connection with the Registration Statement on Form S-3 (Registration Statement No.

BofA Securities, Inc., Morgan Stanley & Co. LLC, RBC Capital Markets, LLC, Scotia Capital (USA) Inc. and U.S. Bancorp Investments, Inc.

Exhibit 1.3(b) $400,000,000 Series 2023E 5.70% Senior Notes due 2034 THE SOUTHERN COMPANY UNDERWRITING AGREEMENT February 26, 2024 BofA Securities, Inc. One Bryant Park New York, New York 10036 Morgan Stanley & Co. LLC 1585 Broadway New York, New York 10036 RBC Capital Markets, LLC Brookfield Place 200 Vesey Street, 8th Floor New York, New York 10281 Scotia Capital (USA) Inc. 250 Vesey Street New

$400,000,000 Series 2023D 5.50% Senior Notes due March 15, 2029

Filed Pursuant to Rule 424(b)(2) Registration No. 333-277138 PROSPECTUS SUPPLEMENT (To Prospectus dated February 16, 2024) $400,000,000 Series 2023D 5.50% Senior Notes due March 15, 2029 This is a public offering by The Southern Company of $400,000,000 of Series 2023D 5.50% Senior Notes due March 15, 2029 (the “Series 2023D Senior Notes”). The Series 2023D Senior Notes offered hereby are part of t

$400,000,000 Series 2023E 5.70% Senior Notes due March 15, 2034

Filed Pursuant to Rule 424(b)(2) Registration No. 333-277138 PROSPECTUS SUPPLEMENT (To Prospectus dated February 16, 2024) $400,000,000 Series 2023E 5.70% Senior Notes due March 15, 2034 This is a public offering by The Southern Company of $400,000,000 of Series 2023E 5.70% Senior Notes due March 15, 2034 (the “Series 2023E Senior Notes”). The Series 2023E Senior Notes offered hereby are part of t

Calculation of Filing Fee Tables 424(b)(2) (Form Type) The Southern Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Tables 424(b)(2) (Form Type) The Southern Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial effective date Filing Fee Previously Paid In Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Debt Series 2023E 5.

Calculation of Filing Fee Tables 424(b)(2) (Form Type) The Southern Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Tables 424(b)(2) (Form Type) The Southern Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial effective date Filing Fee Previously Paid In Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Debt Series 2023D 5.

SUBJECT TO COMPLETION PRELIMINARY PROSPECTUS SUPPLEMENT DATED FEBRUARY 26, 2024

Filed Pursuant to Rule 424(b)(5) Registration No. 333-277138 This Preliminary Prospectus Supplement and the accompanying Prospectus relate to an effective registration statement under the Securities Act of 1933, as amended, but the Preliminary Prospectus Supplement is not complete and may be changed. This Preliminary Prospectus Supplement and the accompanying Prospectus are not an offer to sell th

SUBJECT TO COMPLETION PRELIMINARY PROSPECTUS SUPPLEMENT DATED FEBRUARY 26, 2024

Filed Pursuant to Rule 424(b)(5) Registration No. 333-277138 This Preliminary Prospectus Supplement and the accompanying Prospectus relate to an effective registration statement under the Securities Act of 1933, as amended, but the Preliminary Prospectus Supplement is not complete and may be changed. This Preliminary Prospectus Supplement and the accompanying Prospectus are not an offer to sell th

* Note: A securities rating is not a recommendation to buy, sell or hold securities and may be subject to revision or withdrawal at any time. The issuer has filed a registration statement (including a prospectus) with the SEC for the offering to whic

Filed Pursuant to Rule 433 Registration No. 333-277138 February 26, 2024 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated February 26, 2024) Issuer: The Southern Company Security: Series 2023E 5.70% Senior Notes due March 15, 2034 Expected Ratings:* Baa2 (Positive)/BBB (Positive)/BBB+ (Stable) (Moody’s/Standard & Poor’s/Fitch) Principal Amount: $400,000,000 (Reopening of $700,000,000

* Note: A securities rating is not a recommendation to buy, sell or hold securities and may be subject to revision or withdrawal at any time. The issuer has filed a registration statement (including a prospectus) with the SEC for the offering to whic

Filed Pursuant to Rule 433 Registration No. 333-277138 February 26, 2024 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated February 26, 2024) Issuer: The Southern Company Security: Series 2023D 5.50% Senior Notes due March 15, 2029 Expected Ratings:* Baa2 (Positive)/BBB (Positive)/BBB+ (Stable) (Moody’s/Standard & Poor’s/Fitch) Principal Amount: $400,000,000 (Reopening of $600,000,000

As filed with the Securities and Exchange Commission on February 16, 2024

As filed with the Securities and Exchange Commission on February 16, 2024 Registration No.

iling Fee Table

Exhibit 107.1 Calculation of Filing Fee Tables Form S-3 (Form Type) The Southern Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee

Statement of Eligibility under Trust Indenture Act of 1939, as amended, of the Subordinated Note Indenture Trustee

Exhibit 25.2 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) [] COMPUTERSHARE TRUST COMPANY, NATIONAL ASSOCIATION (Exact name of trustee as specified in its charter)

As filed with the Securities and Exchange Commission on February 16, 2024

As filed with the Securities and Exchange Commission on February 16, 2024 Registration No.

iling Fee Table

Exhibit 107.1 Calculation of Filing Fee Tables Form S-3 (Form Type) The Southern Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee

Power of Attorney and Resolution

Exhibit 24.1 February 5, 2024 Christopher C. Womack, Daniel S. Tucker and Melissa K. Caen Gentlemen and Ms. Caen: The Southern Company (the “Company”) proposes to file with the Securities and Exchange Commission a registration statement or statements under the Securities Act of 1933, as amended, with respect to the issuance and sale of previously registered and unissued shares of its common stock

Power of Attorney and Resolution.

Exhibit 24.1 February 5, 2024 Christopher C. Womack, Daniel S. Tucker and Melissa K. Caen Gentlemen and Ms. Caen: The Southern Company (the “Company”) proposes to file with the Securities and Exchange Commission a registration statement or statements under the Securities Act of 1933, as amended, with respect to the issuance and sale of an indeterminate amount or number of common stock, debt securi

Statement of Eligibility under Trust Indenture Act of 1939, as amended, of the Senior Note Indenture Trustee.

Exhibit 25.1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) [] COMPUTERSHARE TRUST COMPANY, NATIONAL ASSOCIATION (Exact name of trustee as specified in its charter)