Company · Ownership research

MasterBrand, Inc. MBC

CIK 0001941365 · CUSIP 57638P104

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 57638P104 (MBC), not CUSIP 57638P904 (MBC), CUSIP 57638P954 (MBC), and does not merge CUSIPs.

This page lists the top 20 of 344 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	BlackRock, Inc. CIK 2012383 · View history	$254.37M 19,477,410 shares	0.01%	-696.87K(-3.50%)Reduced	SEC filing ↗ May 2, 2025	▾
02	Gates Capital Management, Inc. CIK 1312908 · View history	$126.28M 9,669,562 shares	3.92%	+179.98K(+1.90%)Added	SEC filing ↗ May 15, 2025	▾
03	VANGUARD GROUP INC CIK 102909 · View history	$119.83M 9,175,135 shares	0.00%	-416.31K(-4.30%)Reduced	SEC filing ↗ May 9, 2025	▾
04	Boston Partners CIK 1386060 · View history	$101.93M 7,827,706 shares	0.12%	+2.59M(+49.50%)Added	SEC filing ↗ May 13, 2025	▾
05	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$73.82M 5,651,972 shares	0.02%	+675.20K(+13.60%)Added	SEC filing ↗ May 13, 2025	▾
06	Thrivent Financial for Lutherans CIK 314984 · Amended · View history	$72.82M 5,576,030 shares	0.16%	+492.99K(+9.70%)Added	SEC filing ↗ Aug 26, 2025	▾
07	FMR LLC CIK 315066 · View history	$67.29M 5,152,218 shares	0.00%	+4.16M(+418.40%)Added	SEC filing ↗ May 12, 2025	▾
08	STATE STREET CORP CIK 93751 · View history	$64.41M 4,931,800 shares	0.00%	-218.91K(-4.30%)Reduced	SEC filing ↗ May 15, 2025	▾
09	Coliseum Capital Management, LLC CIK 1409751 · View history	$41.52M 3,178,919 shares	3.47%	+3.18MNew	SEC filing ↗ May 15, 2025	▾
10	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$39.11M 2,993,861 shares	0.00%	+55.01K(+1.90%)Added	SEC filing ↗ May 13, 2025	▾
11	PZENA INVESTMENT MANAGEMENT LLC CIK 1027796 · View history	$37.34M 2,859,484 shares	0.13%	+11.60K(+0.40%)Added	SEC filing ↗ May 2, 2025	▾
12	FULLER & THALER ASSET MANAGEMENT, INC. CIK 1082327 · View history	$36.51M 2,795,644 shares	0.14%	-706.23K(-20.20%)Reduced	SEC filing ↗ May 13, 2025	▾
13	CHARLES SCHWAB INVESTMENT MANAGEMENT INC CIK 884546 · Amended · View history	$32.78M 2,510,270 shares	0.01%	+106.29K(+4.40%)Added	SEC filing ↗ Sep 15, 2025	▾
14	MANGROVE PARTNERS IM, LLC CIK 1535392 · View history	$28.33M 2,169,520 shares	3.10%	0(0.00%)Unchanged	SEC filing ↗ May 15, 2025	▾
15	RENAISSANCE TECHNOLOGIES LLC CIK 1037389 · View history	$20.26M 1,551,673 shares	0.03%	+30.70K(+2.00%)Added	SEC filing ↗ May 14, 2025	▾
16	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC CIK 861177 · View history	$19.82M 1,517,294 shares	0.01%	+59.88K(+4.10%)Added	SEC filing ↗ May 19, 2025	▾
17	NORTHERN TRUST CORP CIK 73124 · View history	$19.60M 1,500,747 shares	0.00%	-21.12K(-1.40%)Reduced	SEC filing ↗ May 13, 2025	▾
18	MORGAN STANLEY CIK 895421 · View history	$18.88M 1,445,716 shares	0.00%	-566.37K(-28.10%)Reduced	SEC filing ↗ May 15, 2025	▾
19	Sixth Street Partners Management Company, L.P. CIK 1812095 · View history	$18.28M 1,400,000 shares	2.40%	0(0.00%)Unchanged	SEC filing ↗ May 13, 2025	▾
20	ALLIANCEBERNSTEIN L.P. CIK 1109448 · View history	$18.06M 1,382,566 shares	0.01%	+1.23M(+796.30%)Added	SEC filing ↗ May 15, 2025	▾

Showing 20 / 344 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

344

Cancelled or null records excluded

Disclosed shares

121,395,854

Not deduplicated across managers

Disclosed value

$1.59B

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

MasterBrand, Inc. · Q1 2025

Explore all 344 reporting institutions.

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.