Company: SOJE
Filing Date: 2025-11-06
Form Type: 8-A12B
Source: 0000092122-25-000096
Chunk: 0

Company: SOUTHERN CO
Filing Date: 2025-11-06
Form: 8-A12B
Chunk 0
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION
<div align='center'>Washington, D. C. 20549

FORM 8-A</div>

### FOR REGISTRATION OF CERTAIN CLASSES

### OF SECURITIES PURSUANT TO
<div align='center'>SECTION 12(b) OR (g) OF THE

SECURITIES EXCHANGE ACT OF 1934</div>

| THE SOUTHERN COMPANY                                   |
| (Exact name of registrant as specified in its charter) |

| Delaware                                                       |     | 58-0690070         |
| (State or other jurisdiction of incorporation or organization) |     | -IRS Employer      
 Identification No. |

| 30 Ivan Allen Jr. Boulevard, N.W., Atlanta, Georgia |     |     30308 |
| (Address of principal executive offices)            |     | -Zip Code |

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

| Title of each class           
 to be so registered           |     | Name of each exchange on which each class is to be so registered |
| 2025 Series A Corporate Units |     | New York Stock Exchange                                          |

If this form relates to the registration of a class of securities pursuant to Section 12(b) of the Exchange Act and is effective pursuant to General Instruction A.(c) or (e), check the following box. x

If this form relates to the registration of a class of securities pursuant to Section 12(g) of the Exchange Act and is effective pursuant to General Instruction A.(d) or (e), check the following box. ¨

If this form relates to the registration of a class of securities concurrently with a Regulation A offering, check the following box. ¨

Securities Act registration statement or Regulation A offering statement file number to which this form relates: 333-2 77138

Securities to be registered pursuant to Section 12(g) of the Act: None

### INFORMATION REQUIRED IN REGISTRATION STATEMENT

## Item 1. Description of Registrant’s Securities to be Registered.
This Registration Statement relates to the 2025 Series A Corporate Units of The Southern Company (the “Company”). A description of the 2025 Series A Corporate Units is contained in (i) the Registration Statement on Form S-3 of the Company (Registration No. 333-277138 ), filed pursuant to the Securities Act of 1933, as amended (the “Securities Act”), on