Company: SOJE
Filing Date: 2025-05-13
Form Type: DEFA14A
Source: 0000092122-25-000046
Chunk: 0

Company: SOUTHERN CO
Filing Date: 2025-05-13
Form: DEFA14A
Chunk 0
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<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934 (Amendment No. )</div>

| ☑ |     | Filed by the Registrant |     | ☐ |     | Filed by a party other than the Registrant |

| CHECK THE APPROPRIATE BOX: |     |                                                                                 |
| ☐                          |     | Preliminary Proxy Statement                                                     |
| ☐                          |     | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
| ☐                          |     | Definitive Proxy Statement                                                      |
| ☑                          |     | Definitive Additional Materials                                                 |
| ☐                          |     | Soliciting Material under §240.14a-12                                           |

#### The Southern Company
<div align='center'>(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)</div>

| PAYMENT OF FILING FEE (CHECK ALL BOXES THAT APPLY): |     |                                                                                                     |
| ☑                                                   |     | No fee required                                                                                     |
| ☐                                                   |     | Fee paid previously with preliminary materials                                                      |
| ☐                                                   |     | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11 |

#### [Employee Email]
2024 was an outstanding year for Southern Company. We celebrated milestones and navigated challenges while continuing to deliver strong financial results, celebrating commercial operation for Vogtle Unit 4, advancing our energy portfolio and transitioning for the future to further the reliability and resilience of our systems. These achievements reflect our team’s commitment to keep the customers and the communities we are privileged to serve at the center of everything we do.

During the 2025 Annual Meeting of Stockholders, our Chairman, President and CEO, Chris Womack, will discuss our 2024 performance, stockholders will vote on the items noted below and he will answer stockholder questions.

Below is a summary of the items up for vote, along with the Board of Directors’ voting recommendations.

| Item                                                       |     | Description                                                                                                                       |     | Board Recommendation      |
| Item #1                                                    
 Election of Directors                                      |     | Elect