Company: SOJE
Filing Date: 2025-11-03
Form Type: 424B5
Source: 0000092122-25-000088
Chunk: 9

Company: SOUTHERN CO
Filing Date: 2025-11-03
Form: 424B5
Chunk 9
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 Blvd., N.W., Atlanta, Georgia 30308, and the telephone number is (404) 506-5000.

The Company is a holding company that owns all of the outstanding common stock of three traditional electric operating companies, Southern Power Company (“Southern Power”) and Southern Company Gas. The traditional electric operating companies – Alabama Power Company, Georgia Power Company and Mississippi Power Company – are each operating public utility companies providing electric service to retail customers in three Southeastern states in addition to wholesale customers in the Southeast. Southern Power is also an operating public utility company. Southern Power develops, constructs, acquires, owns, operates and manages power generation assets, including renewable energy projects, and sells electricity at market-based rates in the wholesale market. Southern Company Gas is an energy services holding company whose primary business is the distribution of natural gas in four states – Illinois, Georgia, Virginia and Tennessee – through its natural gas distribution utilities. Southern Company Gas is also involved in several other businesses that are complementary to the distribution of natural gas.

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### THE OFFERING
In this Prospectus Supplement summary, “Southern Company” and the “Company” refer only to The Southern Company and any successor obligor, and not to any of its subsidiaries.

#### What are Equity Units?
Equity Units may be either Corporate Units or Treasury Units, as described below. 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. You can create Treasury Units from Corporate Units that you own as described below under “How can I create Treasury Units from Corporate Units?”. You can also recreate Corporate Units from Treasury Units that you own as described below under “How can I recreate Corporate Units from Treasury Units?”.

#### What are the components of a Corporate Unit?
Each Corporate Unit initially consists of a contract to purchase the Company’s common stock in the future, a 1/40 undivided beneficial ownership interest in $1,000 principal amount of the Company’s Series 2025B RSNs and a 1/40 undivided beneficial ownership interest in $1,000 principal amount of the Company’s Series 2025C RSNs. The undivided beneficial ownership interest in each series of RSNs corresponds to $25 principal amount of such RSNs. Initially, each series of RSNs will be issued in minimum