Company: SOJE
Filing Date: 2025-11-03
Form Type: 424B5
Source: 0000092122-25-000088
Chunk: 20

Company: SOUTHERN CO
Filing Date: 2025-11-03
Form: 424B5
Chunk 20
---
 final remarketing period or, if the Company elects to conduct an optional remarketing, no later than five business days prior to the first day of the applicable optional remarketing period. The Company will separately pay a fee to the remarketing agent for its services. The holders of the RSNs included in any remarketing will not be responsible for such fee.

#### What is an optional remarketing?
Unless a termination event has occurred, the Company may elect, at its option, to remarket the RSNs on any optional remarketing date occurring during the “period for optional remarketing” beginning on and including June 13, 2028 (the second business day immediately preceding the June 15, 2028 interest payment date) and ending on and including November 21, 2028 (the eighth calendar day prior to the beginning of the final remarketing period), unless the RSNs have been previously successfully remarketed. In any optional remarketing, the RSNs of each series that are a part of Corporate Units and any separate RSNs of either series whose holders have elected to participate in the optional remarketing will be remarketed. Any optional remarketing during the period for optional remarketing will occur during one or more periods of up to 15 business days selected by the Company; any such period of up to 15 business days selected by the Company for an optional remarketing is referred to as an “optional remarketing period,” a remarketing that occurs during an optional remarketing period as an “optional remarketing” and the date the RSNs are priced in an optional remarketing as the “optional remarketing date.” If the Company elects to conduct an optional remarketing, the remarketing agent will use its commercially reasonable efforts to obtain a price for the RSNs of each series that results in aggregate proceeds of at least 100% of the aggregate of (i) the price of the Treasury portfolio described below under “What is the Treasury portfolio?”, which is referred to as the “Treasury portfolio purchase price,” and (ii) the separate RSNs purchase price as defined under “Description of the Remarketable Senior Notes—Remarketing of RSNs That Are Not Included in Corporate Units.” The Company will request that The Depository Trust Company, or DTC, which is referred to as the “depository,” notify its participants holding Corporate Units, Treasury Units and

<div align='center'>S-10</div>

separate RSNs of the Company’s election to