Company: SOJE
Filing Date: 2025-11-03
Form Type: 424B5
Source: 0000092122-25-000088
Chunk: 59

Company: SOUTHERN CO
Filing Date: 2025-11-03
Form: 424B5
Chunk 59
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 contracts over the number of shares that could be purchased by the Company in the market (at the average market price during the period) using the proceeds receivable upon settlement. Consequently, the Company anticipates that there will be no dilutive effect on the Company’s earnings per share except during periods when the average market price of the Company’s common stock is above the threshold appreciation price of $ .

<div align='center'>S-37</div>

### DESCRIPTION OF THE EQUITY UNITS
In this “Description of the Equity Units,” “Southern Company” and the “Company” refer only to The Southern Company and any successor obligor, and not to any of its subsidiaries.

The following is a summary of some of the terms of the Equity Units. This summary, together with the summaries of the terms of the purchase contracts, the purchase contract and pledge agreement and the RSNs set forth under the captions “Description of the Purchase Contracts,” “Certain Provisions of the Purchase Contract and Pledge Agreement” and “Description of the Remarketable Senior Notes” in this Prospectus Supplement, contain a description of the material terms of the Equity Units, but are only summaries and are not complete. This summary is subject to and is qualified by reference to all the provisions of the purchase contract and pledge agreement, the Senior Note Indenture, the RSNs and the form of remarketing agreement, which has been attached as an exhibit to the purchase contract and pledge agreement, including the definitions of certain terms used therein, forms of which have been or will be filed and incorporated by reference as exhibits to the registration statement of which this Prospectus Supplement and the accompanying Prospectus form a part.

#### General
The Company will issue the Equity Units under the purchase contract and pledge agreement among the Company and U.S. Bank Trust Company, National Association, as purchase contract agent (the “purchase contract agent”), collateral agent (the “collateral agent”), custodial agent (the “custodial agent”) and securities intermediary (the “securities intermediary”). The Equity Units may be either Corporate Units or Treasury Units. The Equity Units will initially consist of 35,000,000 Corporate Units (or 40,000,000 Corporate Units if the underwriters exercise their over-allotment option in full), each with a stated amount of $50.

Each Corporate Unit offered will consist of:

• a purchase contract under which

o the holder will agree to purchase from the Company, and the Company will agree to sell to the holder, on December 15,