Company: SOJE
Filing Date: 2025-11-04
Form Type: 424B2
Source: 0000092122-25-000092
Chunk: 59

Company: SOUTHERN CO
Filing Date: 2025-11-04
Form: 424B2
Chunk 59
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 the Series 2020B Junior Subordinated Notes. Any remaining net proceeds will be used for general corporate purposes, including investments in the Company’s subsidiaries.

This Prospectus Supplement does not constitute a notice of redemption with respect to the Series 2020B Junior Subordinated Notes. Any such notice of redemption will only be delivered in accordance with the provisions of the indenture for the Series 2020B Junior Subordinated Notes.

<div align='center'>S-35</div>

### CAPITALIZATION
The table below shows the Company’s unaudited capitalization on a consolidated basis as of September 30, 2025. The “As Adjusted” column reflects the Company’s capitalization after giving effect to this offering and assumes the over-allotment option is not exercised in this offering. The information set forth below is qualified in its entirety by reference to and, therefore, should be read together with management’s discussion and analysis of results of operations and financial condition, the consolidated financial statements and related notes and other financial information incorporated by reference in this Prospectus Supplement and the accompanying Prospectus.

|                                 |     | Capitalization as of 
 September 30, 2025   |         |     |             |         |     |       |   |
|:--------------------------------|:----|:---------------------|--------:|:----|:------------|--------:|:----|------:|:--|
|                                 |     | Actual               |         |     | As Adjusted |         |     |       |   |
| Common Stockholders’ Equity (1) |     | $                    |  35,002 |     | $           |  34,858 |     |  31.1 | % |
| Noncontrolling Interest         |     |                      |   3,272 |     |             |   3,272 |     |   2.9 | % |
| Senior Notes (2)                |     |                      |  50,852 |     |             |  52,602 |     |  47.0 | % |
| Other Long-Term Debt (2)        |     |                      |  21,310 |     |             |  21,310 |     |  19.0 | % |
| Total                           |     | $                    | 110,436 |     | $           | 112,042 |     | 100.0 | % |

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(1) Reflects an adjustment of