Company: SOJE
Filing Date: 2025-02-26
Form Type: 424B2
Source: 0000092122-25-000026
Chunk: 12

Company: SOUTHERN CO
Filing Date: 2025-02-26
Form: 424B2
Chunk 12
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A Floating Rate Notes due September 15, 2026, $500,000,000 aggregate principal amount of Series 2025B 4.85% Senior Notes due March 15, 2031 and $700,000,000 aggregate principal amount of Series 2025C 5.20% Senior Notes due March 15, 2035, which is expected to be completed on March 3, 2025.

### USE OF PROCEEDS
The net proceeds from the sale of the Series 2025B Junior Subordinated Notes will be used by the Company to repay all or a portion of its outstanding commercial paper borrowings, which aggregated approximately $1,207,000,000 as of February 24, 2025. Any remaining net proceeds will be used for other general corporate purposes, which may include investment by the Company in its subsidiaries.

<div align='center'>DESCRIPTION OF THE SERIES 2025B JUNIOR SUBORDINATED NOTES</div>

Set forth below is a description of the specific terms of the Series 2025B Junior Subordinated Notes. This description supplements, and should be read together with, the description of the general terms and provisions of the junior subordinated notes set forth in the accompanying Prospectus under the caption “Description of the Junior Subordinated Notes.” The following description does not purport to be complete and is subject to, and is qualified in its entirety by reference to, the description in the accompanying Prospectus and the Subordinated Note Indenture (as defined below).

#### General
The Series 2025B Junior Subordinated Notes will be issued as a series of junior subordinated notes under the Subordinated Note Indenture dated as of October 1, 2015, as heretofore supplemented and amended and as further supplemented and amended from time to time (the “Subordinated Note Indenture”), between the Company and Computershare Trust Company, N.A., as successor trustee (the “Subordinated Note Indenture Trustee”). The Series 2025B Junior Subordinated Notes will initially be issued in the aggregate principal amount of $1,800,000,000. The Company may, at any time and without the consent of the holders of the Series 2025B Junior Subordinated Notes, issue additional notes having the same ranking and the same interest rate, maturity and other terms as the Series 2025B Junior Subordinated Notes (except for the public offering price and issue date and the initial interest accrual