Company: JACK
Filing Date: 2025-11-07
Form Type: DEFA14A
Source: 0000807882-25-000063
Chunk: 0

Company: JACK IN THE BOX INC
Filing Date: 2025-11-07
Form: DEFA14A
Chunk 0
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<div align='center'>____________________________________________________________________________________</div>

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### SCHEDULE 14A

#### SCHEDULE 14A INFORMATION
<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                                    |

#### JACK IN THE BOX INC.
<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 the appropriate box): |     |                                                                          |
| ☑                                                  |     | No fee required.                                                         |
| ☐                                                  |     | Fee paid previously with preliminary materials.                          |
| ☐                                                  |     | Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11. |

<div align='center'>_____________________________________________________________________________________</div>

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### FORM 8-K

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

Date of Report (Date of earliest event reported): November 3, 2025</div>

#### JACK IN THE BOX INC.
<div align='center'>(Exact name of registrant as specified in its charter)

_________________</div>

| Delaware                     |     | 1-9390      |     | 95-2698708            |
| (State or Other Jurisdiction 
 of Incorporation)            |     | -Commission 
 File Number |     | -I.R.S. Employer      
 Identification Number