Company: ONBPP
Filing Date: 2025-01-29
Form Type: S-4/A
Source: 0001104659-25-007256
Chunk: 59

Company: OLD NATIONAL BANCORP /IN/
Filing Date: 2025-01-29
Form: S-4/A
Chunk 59
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 above.

If you hold your stock through the Bremer 401(k) Plan or the Bremer ESOP, you can change your vote by resubmitting your vote via the Internet or by telephone, or, if you receive a hard copy of this proxy statement/prospectus, by submitting another properly completed voting instruction card bearing a later date for these shares, but any changes must be received by 10:59 p.m. Central Time on March 3, 2025, which is 72 hours prior to the deadline for other shareholders.

#### Solicitation of Proxies
Bremer and Old National will share equally all of the expenses incurred in connection with the printing and mailing of this proxy statement/prospectus. Solicitation of proxies by mail may be supplemented by telephone and other electronic means, advertisements and personal solicitation by the directors, officers or employees of Bremer. No additional compensation will be paid to Bremer’s directors, officers or employees for solicitation.

#### Other Matters to Come Before the Special Meeting
Bremer management does not expect any other business to be presented at the special meeting, but if any other matters are properly presented to the meeting or any adjournments thereof, the persons named in the proxies will vote upon them in accordance with the Bremer board of directors’ recommendations.

#### Questions and Additional Information
If you have any questions about the special meeting, this proxy statement/prospectus, or your ownership of Bremer common stock, please contact Bremer Financial Corporation, by mail to Bremer at 380 St. Peter Street, Suite 500, Saint Paul, Minnesota 55102, Attention: Amy J. Dorn, Corporate Secretary, by email at ajdorn@bremer.com or by telephone at (651) 964-7145.

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TABLE OF CONTENTS

### BREMER PROPOSALS FOR A VOTE BY SHAREHOLDERS

#### Proposal No. 1 — Merger Proposal
**Bremer is asking holders of Bremer common stock to approve and adopt the merger agreement. Holders of Bremer common stock should read this proxy statement/prospectus carefully and in its entirety, including the annexes, for more detailed information concerning the merger agreement and the mergers. A copy of the merger agreement is attached to this proxy statement/prospectus as Annex A .

After careful consideration, the Bremer board of directors has unanimously (i) determined that the merger agreement and the transactions contemplated by the merger