Company: SOJE
Filing Date: 2025-05-27
Form Type: 8-K/A
Source: 0000092122-25-000058
Chunk: 1

Company: SOUTHERN CO
Filing Date: 2025-05-27
Form: 8-K/A
Chunk 1
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 New York Stock Exchange |
| The Southern Company |     | Series 2020C 4.20% Junior Subordinated Notes due 2060                            |     | SOJE      |     | New York Stock Exchange |
| The Southern Company |     | Series 2021B 1.875% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2081 |     | SO 81     |     | New York Stock Exchange |
| The Southern Company |     | Series 2025A 6.50% Junior Subordinated Notes due 2085                            |     | SOJF      |     | New York Stock Exchange |

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

Emerging growth company ☐

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

| Item 5.02. |     | Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. |

On February 12, 2025, The Southern Company (the “Company”) filed a Current Report on Form 8-K (the “Original 8-K”) reporting the election of Mr. James O. (Jimmy) Etheredge to its Board of Directors (the “Board”). At the time of filing the Original 8-K, Board committee assignments for Mr. Etheredge had not been determined.

The Company is filing this Amendment No. 1 to the Original 8-K to report that, on May 21, 2025, the Board appointed Mr. Etheredge to the Audit Committee, the Compensation and Talent Development Committee, and the Finance Committee, effective immediately.

### SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

| Date:   May 27, 2025 |     | THE SOUTHERN COMPANY |     |                     |
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