Company: ATO
Filing Date: 2025-12-09
Form Type: PRE 14A
Source: 0000731802-25-000061
Chunk: 0

Company: ATMOS ENERGY CORP
Filing Date: 2025-12-09
Form: PRE 14A
Chunk 0
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### SCHEDULE 14A
<div align='center'>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 Pursuant to §240.14a-12 |     |   |     |                                                                                 |

#### Atmos Energy Corporation
<div align='center'>(Name of Registrant as Specified in its Charter)</div>

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

| Payment of Filing Fee (Check the appropriate box): |     |                                                                                                      |
| ☒                                                  |     | 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. |

| Joint Letter from Chairman and President and CEO |

| December 19, 2025                                                                                                                                                                                                                                                                                                                                                                                                                                                         
 Dear Shareholder:                                                                                                                                                                                                                                                                                                                                                                                                                                                         
 We are pleased to invite you to attend the annual meeting of shareholders on Wednesday, February 4, 2026, at 9:00 a.m. Central Standard Time, which will be conducted virtually via webcast. You will be able to attend the meeting, vote your shares, and submit questions by logging on towww.virtualshareholdermeeting.com/ATO2026.                                                                                                                                    
 The annual meeting will include a report on our operations and consideration of the matters set forth in the accompanying Notice of Annual Meeting and Proxy Statement. All shareholders of record as of December 12, 2025,