Company: SOJE
Filing Date: 2025-05-27
Form Type: 8-K/A
Source: 0000092122-25-000058
Chunk: 0

Company: SOUTHERN CO
Filing Date: 2025-05-27
Form: 8-K/A
Chunk 0
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION
<div align='center'>Washington, D. C. 20549

FORM 8-K/A

(Amendment No. 1)</div>

### CURRENT REPORT
<div align='center'>Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934</div>

| Commission  
 File Number |     | Registrant,                  
 State of Incorporation,      
 Address and Telephone Number |     | I.R.S. Employer    
 Identification No. |

| 1-3526 |     | The Southern Company |     | 58-0690070 |

<div align='center'>(A DelawareCorporation)

30 Ivan Allen Jr. Boulevard, N.W.

Atlanta, Georgia 30308

( 404) 506-5000</div>

The name and address of the registrant have not changed since the last report.

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

| ☐ |     | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)                  |
| ☐ |     | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)                 |
| ☐ |     | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) |
| ☐ |     | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) |

Securities registered pursuant to Section 12(b) of the Act:

| Registrant           |     | Title of each class                                                              |     | Trading   
 Symbol(s) |     | Name of each exchange   
 on which registered     |
| The Southern Company |     | Common Stock, par value $5 per share                                             |     | SO        |     | New York Stock Exchange |
| The Southern Company |     | Series 2017B 5.25% Junior Subordinated Notes due 2077                            |     | SOJC      |     | New York Stock Exchange |
| The Southern Company |     | Series 2020A 4.95% Junior Subordinated Notes due 2080                            |     | SOJD      |     |