Company: SOJE
Filing Date: 2025-11-03
Form Type: 424B5
Source: 0000092122-25-000088
Chunk: 122

Company: SOUTHERN CO
Filing Date: 2025-11-03
Form: 424B5
Chunk 122
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party in such system in accordance with its rules and procedures and within its established deadlines (European time). The relevant European international clearing system will, if the transaction meets its settlement requirements, deliver instructions to its United States depositary to take action to effect final settlement on its behalf by delivering or receiving securities in DTC, and making or receiving payment in accordance with normal procedures for same-day funds settlement applicable to DTC. Clearstream participants and Euroclear system participants may not deliver instructions directly to their respective United States depositaries. Because of time-zone differences, credits of Corporate Units or Treasury Units received in Clearstream or the Euroclear system as a result of a transaction with a DTC participant will be made during subsequent securities settlement processing and dated the business day following the DTC settlement date. Such credits or any transactions in such Corporate Units or Treasury Units settled during such processing will be reported to the relevant Euroclear system participant or Clearstream participant on such business day. Cash received in Clearstream or the Euroclear system as a result of sales of the Corporate Units or the Treasury Units by or through a Clearstream participant or a Euroclear system participant to a DTC participant will be received with value on the DTC settlement date but will be available in the relevant Clearstream or the Euroclear system cash account only as of the business day following settlement in DTC.

<div align='center'>S-71</div>

### DESCRIPTION OF THE REMARKETABLE SENIOR NOTES
In this “Description of the Remarketable Senior Notes,” “Southern Company” and the “Company” refer only to The Southern Company and any successor obligor, and not to any of its subsidiaries.

The following summary description sets forth certain terms and provisions of the Series 2025B RSNs and the Series 2025C RSNs and to the extent inconsistent therewith replaces the descriptions set forth under the caption “Description of the Senior Notes” in the accompanying Prospectus, to which the Company refers you. Because this description is a summary, it does not describe every aspect of the RSNs and should be read together with the forms of RSNs and the Senior Note Indenture.

The Senior Note Indenture contains the full legal text of the matters described in this section. The Senior Note Indenture has been qualified under the Trust Indenture Act and you should refer to the Trust Indenture Act for provisions that apply to the RSNs.

#### General
The Company will issue each series of RSNs as a series of debt