Company: SOJE
Filing Date: 2025-11-03
Form Type: 424B5
Source: 0000092122-25-000088
Chunk: 38

Company: SOUTHERN CO
Filing Date: 2025-11-03
Form: 424B5
Chunk 38
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Repurchases of the Existing Convertible Senior Notes, and related transactions that will happen concurrently with, or shortly after, the pricing of the Equity Units, are likely to affect the value of the Equity Units and the Common Stock.”

#### What are the risks relating to the Equity Units?
See “Risk Factors” and the risk factors set forth in the documents and reports filed with the SEC that are incorporated by reference in this Prospectus Supplement and in the accompanying Prospectus, including the risk factors set forth under “Risk Factors” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 before you make an investment decision pursuant to this Prospectus Supplement and the accompanying Prospectus.

<div align='center'>S-19</div>

The Offering—Explanatory Diagrams The following diagrams illustrate some of the key features of the purchase contracts and the undivided beneficial ownership interests in RSNs, Corporate Units and Treasury Units. Corporate Units A Corporate Unit consists of three components as described below:

| Purchase Contract                                                                                                                             |     | 1/40 Ownership Interest in Series 2025B RSNs(2)                                                                                                                                                                                                                                                                        |     | 1/40 Ownership Interest in Series 2025C RSNs(2)                                                                                                                                                                                                                                                                        |
| (Owed to Holder)                                                                                                                              
 The Company’s Common Stock at Purchase Contract Settlement Date (December 15, 2028)+Contract Adjustment Payments% per annum paid quarterly(1) |     | -Owed to Holder)                                                                                                                                                                                                                                                                                                       
 Interest% per annum paid quarterly(following a successful remarketing as fixed-rate notes, interest will be payable at a reset rate and will be payable semi-annually or, following a successful remarketing as floating-rate notes, interest will be payable based on a reset spread and will be payable quarterly)(3 |     | -Owed to Holder)                                                                                                                                                                                                                                                                                                       
 Interest% per annum paid quarterly(following a successful remarketing as fixed-rate notes, interest will be payable at a reset rate and will be payable semi-annually or, following a successful remarketing as floating-rate notes, interest will be payable based on a reset spread and will be payable quarterly)(3 |

| (Owed to Southern Company)$50 at Purchase Contract SettlementDate(December 15, 2028) |     | -Owed to Holder)$25 at Maturity(December 15, 2030)(4 |     | -Owed to Holder)$25 at Maturity