Company: SOJE
Filing Date: 2025-02-26
Form Type: 424B2
Source: 0000092122-25-000026
Chunk: 1

Company: SOUTHERN CO
Filing Date: 2025-02-26
Form: 424B2
Chunk 1
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 of the Series 2025B Junior Subordinated Notes on any securities exchange and cannot assure holders that an active after-market for the Series 2025B Junior Subordinated Notes will develop or be sustained or that holders of the Series 2025B Junior Subordinated Notes will be able to sell them at favorable prices or at all.

See “RISK FACTORS” beginning on page S-7 for a description of certain risks associated with investing in the Series 2025B Junior Subordinated Notes.

|                                                    |     | Per Series 2025B Junior Subordinated Note |     |          |     | Total |               |
|:---------------------------------------------------|:----|:------------------------------------------|:----|:---------|:----|:------|--------------:|
| Initial public offering price (1)                  |     |                                           |     | 100.000% |     | $     | 1,800,000,000 |
| Underwriting discount                              |     |                                           |     | 1.000%   |     | $     |    18,000,000 |
| Proceeds, before expenses, to The Southern Company |     |                                           |     | 99.000%  |     | $     | 1,782,000,000 |

(1) Plus accrued interest, if any, from the date of original issuance of the Series 2025B Junior Subordinated Notes, which is expected to be February 28, 2025.

Neither the Securities and Exchange Commission nor any other regulatory body has approved or disapproved of these securities or passed upon the accuracy or adequacy of this Prospectus Supplement or the accompanying Prospectus. Any representation to the contrary is a criminal offense.

The Series 2025B Junior Subordinated Notes are expected to be delivered on or about February 28, 2025 through the book-entry facilities of The Depository Trust Company for the accounts of its participants, including Euroclear Bank SA/NV (“Euroclear”), as operator of the Euroclear system, or Clearstream Banking, S.A., Luxembourg (“Clearstream”).

<div align='center'>Joint Book-Running Managers</div>

| Barclays |     | Citigroup               |     | Mizuho            |
| MUFG     |     | PNC Capital Markets LLC |     | Truist Securities |

February 25, 2025

No dealer, salesperson or other person is authorized to give any information or to represent anything not contained in this Prospectus Supplement, the accompanying Prospect