Company: SOJE
Filing Date: 2025-11-03
Form Type: 424B5
Source: 0000092122-25-000088
Chunk: 6

Company: SOUTHERN CO
Filing Date: 2025-11-03
Form: 424B5
Chunk 6
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 except as so modified or superseded, to constitute a part of this Prospectus Supplement.

<div align='center'>S-1</div>

### CAUTIONARY STATEMENT REGARDING FORWARD LOOKING STATEMENTS
This Prospectus Supplement contains forward-looking statements. In some cases, forward-looking statements can be identified by terminology such as “may,” “will,” “could,” “should,” “expects,” “plans,” “anticipates,” “believes,” “estimates,” “projects,” “predicts,” “potential” or “continue” or the negative of these terms or other similar terminology. Forward-looking statements also include statements regarding the proposed note repurchase transactions described in this Prospectus Supplement. There are various factors that could cause actual results to differ materially from those suggested by the forward-looking statements; accordingly, there can be no assurance that such indicated results will be realized. These factors include:

• the impact of recent and future federal and state regulatory changes, including tax, environmental and other laws and regulations to which Southern Company and its subsidiaries are subject, as well as changes in application of existing laws, regulations and guidance;

• the extent and timing of costs and legal requirements related to coal combustion residuals;

• current and future litigation or regulatory investigations, proceedings, or inquiries, including litigation related to the Kemper County energy facility;

• the effects, extent and timing of the entry of additional competition in the markets in which Southern Company’s subsidiaries operate, including from the development and deployment of alternative energy sources;

• variations in demand for electricity and natural gas;

• available sources and costs of natural gas and other fuels and commodities;

• the ability to complete necessary or desirable pipeline expansion or infrastructure projects, limits on pipeline capacity, public and policymaker support for such projects and operational interruptions to natural gas distribution and transmission activities;

• transmission constraints;

• the ability to control costs and avoid cost and schedule overruns during the development, construction and operation of facilities or other projects due to challenges which include, but are not limited to, changes in labor costs, availability and productivity; challenges with the management of contractors or vendors; subcontractor performance; adverse weather conditions; shortages, delays, increased costs, or inconsistent quality of equipment, materials and labor; contractor or supplier delay; the impacts of inflation and tariffs; delays due to judicial or regulatory action; nonperformance under construction, operating, or other agreements; operational readiness, including specialized operator training and required site safety programs; engineering or design problems or any remediation related thereto; design and other licensing-based compliance