Kurt Wanninger - 15 Dec 2025 Form 4 Insider Report for MasterBrand, Inc. (MBC)

Role: EVP & Chief Operations Officer
Signature: /s/ Andrean R. Horton, attorney-in-fact for Kurt Wanninger
Issuer symbol: MBC
Transactions as of: 15 Dec 2025
Net transactions value: -$240,899
Form type: 4
Filing time: 17 Dec 2025, 16:31:16 UTC
Previous filing: 03 Dec 2025
Next filing: 13 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Wanninger Kurt	EVP & Chief Operations Officer	3300 ENTERPRISE PARKWAY, SUITE 300, BEACHWOOD	/s/ Andrean R. Horton, attorney-in-fact for Kurt Wanninger	17 Dec 2025	0001591630

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MBC	Common Stock, par value $0.01 per share	Tax liability	$240,899	-20,678	-9.6%	$11.65	195,464	15 Dec 2025	Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Reflects the withholding by the issuer of shares having a fair market value equal to the withholding taxes payable by the undersigned at the time the award vested and became payable, such transaction being exempt under Rule 16b-3(e).
F2	Includes a total of 35,522 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.