Company: SOJE
Filing Date: 2025-01-13
Form Type: 8-A12B
Source: 0000092122-25-000010
Chunk: 1

Company: SOUTHERN CO
Filing Date: 2025-01-13
Form: 8-A12B
Chunk 1
---
 final prospectus supplement filed by the Company pursuant to Rule 424(b) under the Securities Act under the caption “Description of the Series 2025A Junior Subordinated Notes”. Such descriptions are incorporated by reference herein.

## Item 2. Exhibits.
| Exhibit Number |     |      |     |                                                                                                                                                                                                                                                        |
|                |     |    1 |     | Registration Statement on Form S-3, filed by the Company (Registration No. 333-277138) (incorporated herein by reference).                                                                                                                             |
|                |     | 4(a) |     | Subordinated Note Indenture dated as of October 1, 2015 (designated in the Company’s Current Report on Form 8-K dated October 1, 2015, File No. 1-3526, as Exhibit 4.3 and incorporated herein by reference).                                          |
|                |     | 4(b) |     | Eleventh Supplemental Indenture to Subordinated Note Indenture dated as of May 6, 2021 (designated in the Company’s Current Report on Form 8-K dated May 3, 2021, File No. 1-3526, as Exhibit 4.4 and incorporated herein by reference).               |
|                |     | 4(c) |     | Fifteenth Supplemental Indenture to the Subordinated Note Indenture dated as of January 13, 2025 (designated in the Company’s Current Report on Form 8-K dated January 8, 2025, File No. 1-3526, as Exhibit 4.4 and incorporated herein by reference). |
|                |     | 4(d) |     | Form of the Series 2025A Junior Subordinated Note (included in Exhibit 4(c) above).                                                                                                                                                                    |

Exhibits heretofore filed with the Securities and Exchange Commission and designated as set forth above are hereby incorporated herein by reference and made a part hereof with the same effect as if filed herewith.

### SIGNATURE
Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereto duly authorized.

| Dated: |     | January 13, 2025 |     | THE SOUTHERN COMPANY |     |                     |
|:-------|:----|: