Company: SOJE
Filing Date: 2025-01-10
Form Type: 424B2
Source: 0000092122-25-000006
Chunk: 8

Company: SOUTHERN CO
Filing Date: 2025-01-10
Form: 424B2
Chunk 8
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 Notes.

The rating agencies that currently or may in the future publish a rating for the Company, including Moody’s Investors Service, Inc., S&P Global Ratings, a division of S&P Global, Inc. and Fitch Ratings, Inc., may, from time to time in the future, change the way they analyze securities with features similar to the Series 2025A Junior Subordinated Notes. This may include, for example, changes to the relationship between ratings assigned to an issuer’s senior securities and ratings assigned to securities with features similar to the Series 2025A Junior Subordinated Notes. If the rating agencies change their practices for rating these types of securities in the future, and the ratings of the Series 2025A Junior Subordinated Notes are subsequently lowered, that could have a negative impact on the trading price of the Series 2025A Junior Subordinated Notes. In addition, the Company may redeem the Series 2025A Junior Subordinated Notes before March 15, 2030 at its option, in whole, but not in part, if a rating agency makes certain changes in the equity credit methodology for securities such as the Series 2025A Junior Subordinated Notes. See “Description of the Series 2025A Junior Subordinated Notes—Right to Redeem Upon a Rating Agency Event” in this Prospectus Supplement.

### AVAILABLE INFORMATION
The Company is subject to the informational requirements of the Securities Exchange Act of 1934, as amended (the “1934 Act”), and in accordance with the 1934 Act files reports, proxy statements and other information with the Securities and Exchange Commission (the “SEC”). The SEC maintains a website that contains reports, proxy statements and other information regarding registrants, including the Company, that file electronically at http://www.sec.gov. Only the Company’s SEC filings referenced below are incorporated by reference herein.

### INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
The following documents have been filed with the SEC pursuant to the 1934 Act and are incorporated by reference in this Prospectus Supplement and made a part of this Prospectus Supplement:

• the Form 10-K ;

• the Company’s Quarterly Reports on Form 10-Q for the quarters ended March 31, 2024 , June 30, 2024 and September 30, 2024 ;

• all information in the Company’s Definitive Proxy Statement on Schedule 14A filed on April 12, 2024 , to the extent incorporated by reference in the Form 10-K ;