Company: ONBPP
Filing Date: 2025-07-11
Form Type: 8-K/A
Source: 0001628280-25-034796
Chunk: 0

Company: OLD NATIONAL BANCORP /IN/
Filing Date: 2025-07-11
Form: 8-K/A
Chunk 0
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### WASHINGTON, DC 20549
<div align='center'>_________________________________________________________</div>

#### FORM 8-K/A

#### Amendment No. 1 to Form 8-K
<div align='center'>_________________________________________________________</div>

### 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): May 1, 2025

_________________________________________________________</div>

### OLD NATIONAL BANCORP
<div align='center'>(Exact name of Registrant as specified in its charter)

_________________________________________________________</div>

| Indiana                                        |     | 001-15817               |     | 35-1539838                       |
| (State or other jurisdiction of incorporation) |     | -Commission File Number |     | -IRS Employer Identification No. |

| One Main Street                          |     |             |         |     |           |
|                                          |     | Evansville, | Indiana |     |     47708 |
| (Address of Principal Executive Offices) |     |             |         |     | -Zip Code |

<div align='center'>Registrant’s telephone number, including area code: ( 773) 765-7675

________________________________________________________

(Former name or former address if changed since last report.)</div>

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:

| Title of each class                                                                                                     |     | Trading   
 Symbol(s) |     | Name of each exchange on which registered |
| Common Stock, No Par Value                                                                                              |     | ONB       |     | The NASDAQ Stock Market LLC