Company: SOJE
Filing Date: 2025-03-31
Form Type: PRE 14A
Source: 0000092122-25-000032
Chunk: 127

Company: SOUTHERN CO
Filing Date: 2025-03-31
Form: PRE 14A
Chunk 127
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 and up to 100% of performance-based non-equity compensation may be deferred at the election of eligible employees.

Under the DCP, participants make an annual election to choose how much compensation to defer, when those deferrals will be paid and how distributions will be paid (in one to ten annual installments).

DCP participants have five notional investment options: the stock equivalent account, the prime equivalent account and three equivalent index fund accounts. Under the terms of the DCP, participants are permitted to transfer between investments at any time.

| DCP Notional Investment        
 Account Options                |     | Summary                                                                                                                                                                                                                                        |     | 2024 Rate 
 of Return |       |   |
| Stock Equivalent Account       |     | Treated as invested at a rate of return equivalent to that of an actual investment in common stock, including crediting dividend equivalents as paid by Southern Company                                                                       |     |           | 21.69 | % |
| Prime Equivalent Account       |     | Treated as invested in prime interest rate compounding monthly, as published inThe Wall Street Journalas the base rate on corporate loans posted as of the last business day of each month by at least 75% of the United States’ largest banks |     |           |  8.62 | % |
| Equivalent Index Fund Accounts |     | Treated as invested in one of the following:                                                                                                                                                                                                   |     |           |       |   |
|                                |     | 4Equivalent Vanguard Institutional 500 Index Fund                                                                                                                                                                                              |     |           | 25.00 | % |
|                                |     | 4Equivalent BlackRock Russell 2000 Index Fund                                                                                                                                                                                                  |     |           | 11.56 | % |
|                                |     | 4Equivalent BlackRock EAFE Equity Index Fund                                                                                                                                                                                                   |     |           |  3.78 | % |

As of January 1, 2018, all of the NEOs were eligible to participate in the DCP. There is no enhancement or acceleration of payments under the DCP associated with termination or change-in-control events, other amounts deferred prior to 2005 which can be paid as a lump sum per the Benefit Administration Committee’s discretion. The lump sums that would be payable are those that are reported in the Nonqualified Deferred Compensation table.

#### 104Southern Company2025 Proxy Statement
| Our Mission                                                                                                                                                                                                                                                                                                                            
 Building the future of energy                                                                                                                                                                                                                                                                                                          
 For more than a century, we've been providing clean, safe, reliable and affordable energy to