Company: SOJE
Filing Date: 2025-02-25
Form Type: 424B5
Source: 0000092122-25-000022
Chunk: 6

Company: SOUTHERN CO
Filing Date: 2025-02-25
Form: 424B5
Chunk 6
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 the interest rate during any Interest Reset Period will not reset below the initial interest rate). In the past, United States Treasury rates have experienced significant fluctuations. Historical levels, fluctuations and trends of United States Treasury rates are not necessarily indicative of future levels. Any historical upward or downward trend in United States Treasury rates is not an indication that United States Treasury rates are more or less likely to increase or decrease at any time after March 15, 2035, and historical United States Treasury rates are not an indication of future Five-Year Treasury Rates.

### 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.

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### 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 ;

• 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 ; and

• the Company’s Current Reports on Form 8-K dated January 8, 2025 and February 11, 2025 and Current Report on Form 8-K/A dated December 5, 202 4 (filed on February 11, 2025).

All documents filed by the Company with the SEC pursuant to Section 13(a), 13(c), 14 or 15(d) of the 1934 Act subsequent to the date of this Prospectus Supplement and prior to the termination of this offering shall be deemed to be incorporated by reference in this Prospectus Supplement and made a part of this Prospectus Supplement from the date of filing of such documents; provided, however, that the Company is not incorporating any information furnished under Item 2.02 or 7.01 of any Current Report on Form 8-K unless specifically stated otherwise. Any statement contained in a document incorporated or deemed to be incorporated by reference