Company: SOJE
Filing Date: 2025-11-03
Form Type: 424B5
Source: 0000092122-25-000088
Chunk: 68

Company: SOUTHERN CO
Filing Date: 2025-11-03
Form: 424B5
Chunk 68
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 Units
The Company may purchase from time to time any of the Equity Units that are then outstanding by tender, in the open market, by private agreement or otherwise, subject to compliance with applicable law.

<div align='center'>S-42</div>

### DESCRIPTION OF THE PURCHASE CONTRACTS
In this “Description of the Purchase Contracts,” “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 purchase contracts. The purchase contracts will be issued pursuant to the purchase contract and pledge agreement among the Company, the purchase contract agent, the collateral agent, the custodial agent and the securities intermediary. The summaries of the purchase contracts and the purchase contract and pledge agreement contain a description of the material terms of the contracts 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, including the definitions of certain terms used therein, forms of which have been or will be filed and incorporated by reference as an exhibit to the registration statement of which this Prospectus Supplement and the accompanying Prospectus form a part.

#### Purchase of Common Stock
Each purchase contract that is a component of a Corporate Unit or a Treasury Unit will obligate its holder to purchase, and the Company to issue and deliver, on December 15, 2028 (or if such day is not a business day, the following business day) (the “purchase contract settlement date”), for $50 in cash a number of shares of the Company’s common stock equal to the settlement rate (together with cash, if applicable, in lieu of any fractional shares of common stock in the manner described below), unless the purchase contract terminates prior to that date or is settled early at the holder’s option. The number of shares of the Company’s common stock issuable upon settlement of each purchase contract on the purchase contract settlement date (which is referred to as the “settlement rate”) will be determined as follows, subject to adjustment as described under “—Anti-dilution Adjustments” below:

(1) If the applicable market value of the Company’s common stock is equal to or greater than the “threshold appreciation price” of $ , the settlement rate will be shares of the Company’s common stock (this settlement rate is referred to as the “minimum settlement rate”