Sec Form 4 Filing - McCormick Tracy S @ MidWestOne Financial Group, Inc. - 2026-02-13

FORM 4 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 McCormick Tracy S 2. Issuer Name and Ticker or Trading Symbol MidWestOne Financial Group, Inc. [ MOFG] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 102 S. CLINTON STREET, P.O. BOX 1700 3. Date of Earliest Transaction (MM/DD/YY) 02/13/2026 (Street) IOWA CITY, IA52244-1700 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 02/13/2026 D( 1 )( 2 )( 3 ) 93,856 D 0 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 McCormick Tracy S 102 S. CLINTON STREET P.O. BOX 1700 IOWA CITY, IA52244-1700 X Signatures Kenneth R. Urmie, Deputy Corporate Secretary, for Tracy S. McCormick under Power of Attorney dated April 27, 2023 02/17/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On February 13, 2026 (the Effective Time), pursuant to the terms of the Agreement and Plan of Merger (the Merger Agreement) dated as of October 23, 2025, by and between MidWestOne Financial Group, Inc. (MOFG) and Nicolet Bankshares, Inc. (NIC), MOFG merged with and into NIC (the Merger). Defined terms not otherwise defined herein shall have the meaning set forth in the Merger Agreement. ( 2 )Pursuant to the terms of the Merger Agreement, at the Effective Time, each outstanding share of MOFG Common Stock was canceled and converted into the right to receive 0.3175 of a share of NIC Common Stock (the Merger Consideration). ( 3 )Pursuant to the terms of the Merger Agreement, at the Effective Time, each outstanding MOFG RSU Award was fully vested, canceled and converted into the right to receive a number of shares of NIC Common Stock equal to the product of (i) the number of shares of MOFG Common Stock subject to such MOFG RSU Award immediately prior to the Effective Time multiplied by (ii) the Exchange Ratio, less any applicable withholding taxes.

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).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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