Sec Form 3 Filing - Wanninger Kurt @ MasterBrand, Inc. - 2023-05-07

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 Wanninger Kurt 2. Issuer Name and Ticker or Trading Symbol MasterBrand, Inc. [ MBC] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) EVP & Chief Operations Officer (Last) (First) (Middle) ONE MASTERBRAND CABINETS DRIVE 3. Date of Earliest Transaction (MM/DD/YY) 05/07/2023 (Street) JASPER, IN47546 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, par value $0.01 per share 235,141 ( 1 ) 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 Stock option (right to buy) $ 5.94 ( 2 ) 02/21/2029 Common Stock, par value $0.01 per share 14,791 D Stock option (right to buy) $ 8.58 ( 2 ) 02/24/2030 Common Stock, par value $0.01 per share 23,962 D Stock option (right to buy) $ 10.76 ( 3 ) 03/22/2031 Common Stock, par value $0.01 per share 24,706 D Stock option (right to buy) $ 10.75 ( 4 ) 02/28/2032 Common Stock, par value $0.01 per share 25,717 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Wanninger Kurt ONE MASTERBRAND CABINETS DRIVE JASPER, IN47546 EVP & Chief Operations Officer Signatures Andrean R. Horton, attorney-in-fact for Kurt Wanninger 05/17/2023 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Includes a total of 169,097 restricted stock units that have not yet vested and 40,348 shares, the receipt of which has been deferred under the issuer's deferred compensation plan. ( 2 )All of the options have vested. ( 3 )Two-thirds of the options have vested. The remaining one-third will vest in on February 28, 2024, subject to the reporting person's continued employment with the issuer. ( 4 )One-third of the options have vested. The remaining two-thirds will vest in in two equal annual installments beginning on February 28, 2024, subject to the reporting person's continued employment with the issuer.

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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