Company: SOJE
Filing Date: 2025-01-10
Form Type: 424B2
Source: 0000092122-25-000006
Chunk: 0

Company: SOUTHERN CO
Filing Date: 2025-01-10
Form: 424B2
Chunk 0
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Filed Pursuant to Rule 424(b)(2)

Registration No. 333-277138

PROSPECTUS SUPPLEMENT

(To Prospectus dated February 16, 2024)

<div align='center'>$500,000,000</div>

#### Series 2025A 6.50% Junior Subordinated Notes

#### due March 15, 2085
The Series 2025A 6.50% Junior Subordinated Notes due March 15, 2085 (the “Series 2025A Junior Subordinated Notes”) will bear interest at a fixed rate of 6.50% per year. Interest will be payable quarterly in arrears on March 15, June 15, September 15 and December 15 of each year, beginning on March 15, 2025. The Series 2025A Junior Subordinated Notes will be issued in registered form and in denominations of $25.00 and integral multiples of $25.00 in excess thereof. The Series 2025A Junior Subordinated Notes will mature on March 15, 2085.

So long as no Event of Default (as defined herein) has occurred and is continuing, The Southern Company may defer interest payments on the Series 2025A Junior Subordinated Notes on one or more occasions for up to 40 consecutive quarterly periods as described in this Prospectus Supplement. Deferred interest payments will accrue additional interest at a rate of 6.50% per year, compounded quarterly, to the extent permitted by applicable law.

The Southern Company may redeem the Series 2025A Junior Subordinated Notes at its option at the times and the prices described in this Prospectus Supplement.

The Series 2025A Junior Subordinated Notes are a new issue of securities with no established trading market. The Southern Company intends to apply to list the Series 2025A Junior Subordinated Notes on the New York Stock Exchange. If the application is approved, The Southern Company expects trading in the Series 2025A Junior Subordinated Notes to begin within 30 days after the date that the Series 2025A Junior Subordinated Notes are first issued.

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

|                                                    |     | Per Series 2025A Junior Subordinated Note |     |         |     | Total |             |
|:---------------------------------------------------|:----|:------------------------------------------|