Company: SOJE
Filing Date: 2025-11-03
Form Type: 424B5
Source: 0000092122-25-000088
Chunk: 57

Company: SOUTHERN CO
Filing Date: 2025-11-03
Form: 424B5
Chunk 57
---
 2024A Convertible Senior Notes was approximately $1,171.9 million.

The Company may also repurchase outstanding Existing Convertible Senior Notes following completion of this offering. Any repurchases of the Existing Convertible Senior Notes could affect the market price of the Common Stock, and the reference price of the stock purchase contract component of the Equity Units and accordingly the market price of the Equity Units being offered hereby, particularly in the case of repurchases effected concurrently with this offering.

The Company is negotiating these repurchases through BofA Securities, Inc. or its affiliate.

See “Risk Factors—Risks Relating to the Equity Units—Repurchases of the Existing Convertible Senior Notes, and related transactions that will happen concurrently with, or shortly after, the pricing of the Equity Units, are likely to affect the value of the Equity Units and the Common Stock.”

The Company intends to use the remaining net proceeds from this offering (i) to repay all or a portion of the Company’s short-term indebtedness, which aggregated $407 million as of October 31, 2025, (ii) to repay at maturity all or a portion of the remaining outstanding Series 2023A Convertible Senior Notes and (iii) to satisfy all or a portion of the redemption price in connection with the proposed redemption at par of the $1.25 billion aggregate principal amount of the Series 2020B Junior Subordinated Notes. Any remaining net proceeds will be used for general corporate purposes, including investments in the Company’s subsidiaries.

This Prospectus Supplement does not constitute a notice of redemption with respect to the Series 2020B Junior Subordinated Notes. Any such notice of redemption will only be delivered in accordance with the provisions of the indenture for the Series 2020B Junior Subordinated Notes.

<div align='center'>S-35</div>

### CAPITALIZATION
The table below shows the Company’s unaudited capitalization on a consolidated basis as of September 30, 2025. The “As Adjusted” column reflects the Company’s capitalization after giving effect to this offering and assumes the over-allotment option is not exercised in this offering. The information set forth below is qualified in its entirety by reference to and, therefore, should be read together with management’s discussion and analysis of results of operations and financial condition, the consolidated financial statements and related notes and other financial information incorporated by reference in this Prospectus Supplement and the accompanying Prospectus.

|                                 |     | Capitalization as of 
 September 30,