Sec Form 3 Filing - Otto Bremer Trust @ OLD NATIONAL BANCORP /IN/ - 2025-05-01

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Otto Bremer Trust 2. Issuer Name and Ticker or Trading Symbol OLD NATIONAL BANCORP /IN/ [ ONB] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 30 E 7TH ST STE 2900 3. Date of Earliest Transaction (MM/DD/YY) 05/01/2025 (Street) ST. PAUL, MN55101 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 43,137,330 ( 1 ) ( 2 ) D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Otto Bre mer Trust 30 E 7TH ST STE 2900 ST. PAUL, MN55101 X X Signatures /s/ Daniel C. Reardon (Co-CEO and Trustee of Otto Bremer Trust) 05/07/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Shares acquired pursuant to the Agreement and Plan of Merger (the "Merger Agreement"), dated as of November 25, 2024, by and among Bremer Financial Corporation ("Bremer"), Old National Bancorp (the "Issuer"), and ONB Merger Sub, Inc. ("Merger Sub"), pursuant to which Merger Sub merged with and into Bremer (the "First Step Merger"), with Bremer surviving the First Step Merger as a wholly owned subsidiary of the Issuer, and immediately following the First Step Merger, and as part of a single, integrated transaction, Bremer merged with and into the Issuer (the "Second Step Merger"), with the Issuer surviving the Second Step Merger as the surviving entity. Pursuant to the Merger Agreement, at the effective time of the First Step Merger (the "Effective Time"), each share of the common stock of Bremer converted into the right to receive (i) 4.182 shares of the common stock, no par value per share ("Common Stock"), of the Issuer and (ii) $26.22 in cash without interest. ( 2 )The Reporting Person has three Co-CEOs and trustees ("Trustees"). Any action by the Reporting Person with respect to the shares of Common Stock may be taken only by majority vote of the Trustees and, therefore, no Trustee individually has voting or dispositive power with respect to the shares.

Remarks: Solely for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, the Reporting Person may be deemed to be a director-by-deputization by virtue of the Reporting Person's contractual right to appoint a director to the board of directors of the Issuer, effective as of the Effective Time, pursuant to the Investor Agreement by and between the Trustees and the Issuer, dated November 25, 2024.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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