Company: ONBPP
Filing Date: 2025-01-29
Form Type: S-4/A
Source: 0001104659-25-007256
Chunk: 5

Company: OLD NATIONAL BANCORP /IN/
Filing Date: 2025-01-29
Form: S-4/A
Chunk 5
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651) 964-7145.

| ​ | Jeanne H. CrainPresident and Chief Executive OfficerBremer Financial Corporation | ​ | ​ | Ronald JamesChairmanBremer Financial Corporation | ​ |

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES REGULATORY AGENCY HAS APPROVED OR DISAPPROVED OF THE TRANSACTIONS DESCRIBED IN THIS PROXY STATEMENT/PROSPECTUS, PASSED UPON THE MERITS OR FAIRNESS OF THE MERGERS OR RELATED TRANSACTIONS OR PASSED UPON THE ADEQUACY OR ACCURACY OF THE DISCLOSURE IN THIS PROXY STATEMENT/PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY CONSTITUTES A CRIMINAL OFFENSE. THE SECURITIES TO BE ISSUED IN THE MERGERS ARE NOT SAVINGS OR DEPOSIT ACCOUNTS OR OTHER OBLIGATIONS OF ANY BANK OR NON-BANK SUBSIDIARY OF EITHER OLD NATIONAL OR BREMER, AND THEY ARE NOT INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY OTHER GOVERNMENTAL AGENCY. This proxy statement/prospectus is dated January [ ], 2025, and
is first being mailed or otherwise delivered to Bremer shareholders on or about [ ], 2025.

TABLE OF CONTENTS

### NOTICE OF SPECIAL MEETING OF SHAREHOLDERS

#### TO BE HELD ON MARCH 7, 2025
To the Shareholders of Bremer Financial Corporation:

On November 25, 2024, Old National Bancorp (“Old National”), Bremer Financial Corporation (“Bremer”), and ONB Merger Sub, Inc., an Indiana corporation and a wholly-owned subsidiary of Old National (“ONB Merger Sub”), entered into an Agreement and Plan of Merger (the “merger agreement”), a copy of which is attached as Annex A to the accompanying proxy statement/prospectus, that provides for the acquisition of Bremer by Old National. Under the merger agreement, ONB Merger Sub will first merge with and into Bremer (the “first step merger”), with Bremer as the surviving corporation in the first step merger as a wholly-owned subsidiary of Old National. Immediately following the first step merger, and as part of a single, integrated transaction, Bremer will then merge with and into Old National (the “second step merger” and together with the first step merger, the “mergers”), with Old National as