Company: ONBPP
Filing Date: 2025-01-14
Form Type: S-4
Source: 0001104659-25-003488
Chunk: 53

Company: OLD NATIONAL BANCORP /IN/
Filing Date: 2025-01-14
Form: S-4
Chunk 53
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-years digits method.

U)

Adjustment to income tax expense as a result of the transaction accounting adjustments, using an estimated blended federal and state statutory tax rate of 25%.

V)

Adjustments to weighted-average common shares outstanding to eliminate weighted-average shares of Bremer common stock outstanding and to record shares of Old National common stock outstanding using the exchange ratio of 4.182 per the merger agreement.

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TABLE OF CONTENTS

### INFORMATION ABOUT THE BREMER SPECIAL MEETING
This section contains information for holders of Bremer common stock about the special meeting that Bremer has called to allow holders of Bremer common stock to consider and vote on the merger agreement and other related matters. This proxy statement/prospectus is accompanied by a notice of the special meeting of holders of Bremer common stock and a form of proxy card that the Bremer board of directors is soliciting for use by the holders of Bremer common stock at the special meeting of shareholders and at any adjournments or postponements of the special meeting.

#### Time, Date, and Place
The Bremer special meeting of shareholders will be held virtually via the Internet on [ ], 2025, at [ ] Central Time. Even if you plan to attend the Bremer special meeting, we recommend that you vote your shares in advance as described below so that your vote will be counted if you later decide not to or become unable to attend the special meeting.

#### Matters to Be Considered
At the Bremer special meeting of shareholders, holders of Bremer common stock will be asked to consider and vote on the following proposals:

•

the merger proposal; and

•

the adjournment proposal.

#### Recommendation of The Bremer Board of Directors
The Bremer board of directors unanimously recommends that Bremer shareholders vote “

#### FOR
” the merger proposal and “

#### FOR
” the adjournment proposal. For the factors considered by the Bremer board of directors in reaching its decision to approve and adopt the merger agreement, see “The Mergers — Bremer’s Reasons for the Mergers; Recommendation of Bremer’s Board of Directors.”

#### Record Date and Quorum
The Bremer board of directors has fixed the close of business on [ ], 2025 as the record date for the Bremer special meeting. Only holders of record of Bremer common stock as of the close of business on the record date are entitled to notice of, and to vote at, the Bremer special meeting, or any adjourn