Company: SOJE
Filing Date: 2025-11-03
Form Type: 424B5
Source: 0000092122-25-000088
Chunk: 8

Company: SOUTHERN CO
Filing Date: 2025-11-03
Form: 424B5
Chunk 8
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 the Southern Company system’s business resulting from cyber intrusion or physical attack and the threat of cyber and physical attacks;

• global and United States economic conditions, including impacts from geopolitical conflicts, recession, inflation, changes in trade policies (including tariffs and other trade measures) of the United States and other countries, interest rate fluctuations and financial market conditions, and the results of financing efforts;

• access to capital markets and other financing sources;

• changes in Southern Company’s and any of its subsidiaries’ credit ratings;

• the ability of Southern Company’s electric utilities to obtain additional generating capacity (or sell excess generating capacity) at competitive prices;

• catastrophic events such as fires, earthquakes, explosions, floods, tornadoes, hurricanes and other storms, droughts, pandemic health events, political unrest, wars, or other similar occurrences;

• the direct or indirect effects on the Southern Company system’s business resulting from incidents affecting the United States electric grid, natural gas pipeline infrastructure, or operation of generating or storage resources;

• impairments of goodwill or long-lived assets;

• the effect of accounting pronouncements issued periodically by standard-setting bodies; and

• other factors discussed elsewhere herein and in other reports filed by the Company from time to time with the SEC.

The Company expressly disclaims any obligation to update any forward-looking statements.

<div align='center'>S-3</div>

### PROSPECTUS SUPPLEMENT SUMMARY
The following summary should be read together with the information contained or incorporated by reference in other parts of this Prospectus Supplement and the accompanying Prospectus. This summary highlights selected information from this Prospectus Supplement and the accompanying Prospectus about the Company’s business and the offering of Equity Units. For a more complete understanding of the Company and this offering, the Company encourages you to read this Prospectus Supplement and the accompanying Prospectus, including the documents incorporated by reference herein, carefully to fully understand the Equity Units as well as other considerations that are important in deciding whether to invest in the Equity Units. You should pay special attention to the “Risk Factors” section beginning on page S-28 of this Prospectus Supplement and the “Risk Factors” section in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 , incorporated by reference herein, to determine whether an investment in the Equity Units is appropriate for you.

### THE SOUTHERN COMPANY
The Company was incorporated under the laws of Delaware on November 9, 1945. The principal executive offices of the Company are located at 30 Ivan Allen Jr.