Company: SOJE
Filing Date: 2025-11-04
Form Type: 424B2
Source: 0000092122-25-000092
Chunk: 40

Company: SOUTHERN CO
Filing Date: 2025-11-04
Form: 424B2
Chunk 40
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/20 Ownership Interest in Treasury Security |
| (Owed to Holder)The Company’s Common Stock at PurchaseContract Settlement Date(December 15, 2028)+Contract Adjustment Payments2.975% per annum paid quarterly(2) |     |                                              |

| (Owed to Southern Company)$50 at Purchase Contract SettlementDate (December 15, 2028) |     | -Owed to Holder)$50 at Maturity(on or prior to December 15, 2028 |

(1) Treasury Units may only be created in integral multiples of 40 Corporate Units. As a result, the creation of 40 Treasury Units will release $1,000 principal amount of RSNs of each series held by the collateral agent. During a blackout period or following a successful remarketing, you may not create Treasury Units or recreate Corporate Units. (2) Contract adjustment payments may be deferred as described under “Description of the Purchase Contracts—Contract Adjustment Payments” below. The holder of a Treasury Unit owns the 1/20 undivided beneficial ownership interest in the Treasury security that forms a part of the Treasury Unit, but will pledge it to the Company through the collateral agent to secure the holder’s obligation under the related purchase contract.

<div align='center'>S-21</div>

#### Purchase Contract
Corporate Units and Treasury Units both include a purchase contract under which the holder agrees to purchase shares of the Company’s common stock on the purchase contract settlement date. In addition, the purchase contracts require the Company to make contract adjustment payments as shown in the diagrams on the preceding pages.

(1) The “reference price” is $93.15, which will be the closing price of the Company’s common stock on the New York Stock Exchange on the date the Equity Units are priced.

(2) The “threshold appreciation price” is equal to $50 divided by the minimum settlement rate (such quotient rounded to the nearest $0.0001), which is $116.44 and represents appreciation of approximately 25.0% over the reference price.

(3) If the applicable market value of the Company’s common stock is less than or equal to the reference price of $93.15, 0.5368 shares of the Company’s common stock (subject to adjustment).

(4) If the applicable market value of the Company’s common stock is greater than the reference price and less than the threshold appreciation price of $116.44, the number of shares of the Company’s common stock to be delivered to a holder