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 332 rows by value; the complete set is available through the API.

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	$213.76M 19,362,098 shares	0.00%	+486.32K(+2.60%)Added	SEC filing ↗ Feb 12, 2026	▾
02	Coliseum Capital Management, LLC CIK 1409751 · View history	$118.93M 10,772,614 shares	9.74%	+3.21M(+42.40%)Added	SEC filing ↗ Feb 17, 2026	▾
03	Gates Capital Management, Inc. CIK 1312908 · View history	$101.85M 9,225,631 shares	3.55%	-1.15M(-11.10%)Reduced	SEC filing ↗ Feb 17, 2026	▾
04	VANGUARD GROUP INC CIK 102909 · View history	$100.23M 9,079,055 shares	0.00%	-3.28K(0.00%)Reduced	SEC filing ↗ Jan 29, 2026	▾
05	Boston Partners CIK 1386060 · View history	$96.49M 8,696,649 shares	0.10%	-233.55K(-2.60%)Reduced	SEC filing ↗ Feb 13, 2026	▾
06	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$72.46M 6,563,076 shares	0.02%	+273.88K(+4.40%)Added	SEC filing ↗ Feb 12, 2026	▾
07	Diameter Capital Partners LP CIK 1727012 · View history	$66.35M 6,010,410 shares	6.94%	+950.00K(+18.80%)Added	SEC filing ↗ Feb 17, 2026	▾
08	STATE STREET CORP CIK 93751 · View history	$54.73M 4,957,171 shares	0.00%	+24.80K(+0.50%)Added	SEC filing ↗ Feb 13, 2026	▾
09	Sixth Street Partners Management Company, L.P. CIK 1812095 · View history	$54.16M 4,905,383 shares	5.56%	+1.57M(+46.90%)Added	SEC filing ↗ Feb 17, 2026	▾
10	Pertento Partners LLP CIK 1894571 · View history	$42.83M 3,879,977 shares	4.71%	+3.88MNew	SEC filing ↗ Feb 17, 2026	▾
11	PZENA INVESTMENT MANAGEMENT LLC CIK 1027796 · View history	$41.80M 3,785,921 shares	0.13%	-337.13K(-8.20%)Reduced	SEC filing ↗ Feb 6, 2026	▾
12	FMR LLC CIK 315066 · View history	$41.07M 3,720,524 shares	0.00%	+17.29K(+0.50%)Added	SEC filing ↗ Feb 17, 2026	▾
13	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC CIK 861177 · View history	$34.49M 3,124,391 shares	0.01%	+174.73K(+5.90%)Added	SEC filing ↗ Feb 13, 2026	▾
14	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$33.24M 3,010,428 shares	0.00%	-376(0.00%)Reduced	SEC filing ↗ Feb 9, 2026	▾
15	COOKE & BIELER LP CIK 24386 · View history	$31.25M 2,831,036 shares	0.33%	+2.83MNew	SEC filing ↗ Feb 9, 2026	▾
16	GOLDMAN SACHS GROUP INC CIK 886982 · Amended · View history	$28.89M 2,616,658 shares	0.00%	+144.57K(+5.80%)Added	SEC filing ↗ Mar 25, 2026	▾
17	CHARLES SCHWAB INVESTMENT MANAGEMENT INC CIK 884546 · View history	$27.73M 2,511,853 shares	0.00%	+20.21K(+0.80%)Added	SEC filing ↗ Feb 13, 2026	▾
18	ACK Asset Management LLC CIK 1510940 · View history	$25.39M 2,300,000 shares	3.19%	0(0.00%)Unchanged	SEC filing ↗ Feb 13, 2026	▾
19	RENAISSANCE TECHNOLOGIES LLC CIK 1037389 · View history	$25.08M 2,271,863 shares	0.04%	+158.50K(+7.50%)Added	SEC filing ↗ Feb 12, 2026	▾
20	CANYON CAPITAL ADVISORS LLC CIK 1074034 · View history	$21.65M 1,960,766 shares	2.85%	+160.77K(+8.90%)Added	SEC filing ↗ Feb 17, 2026	▾

Showing 20 / 332 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

332

Cancelled or null records excluded

Disclosed shares

146,865,557

Not deduplicated across managers

Disclosed value

$1.62B

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. · Q4 2025

Explore all 332 reporting institutions.

This page includes 20 of 332 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

Download CSV
Earlier quarters
Advanced screening & filtering
API & AI access

Already have an account?

＋ New accounts get free API credits to explore data beyond ownership filings.

For AI agents & developers

The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. This page lists 20 of 332 reporting institutions; totals use the complete disclosed data.

Without an account: the last 3 years, with the row caps stated on the page. A free account opens all history on file on these pages and the CSV of what a page shows. Rows beyond the caps and bulk retrieval go through the authenticated API / MCP / CLI.

MCP  https://api.akkrudata.ai/mcp

akkru_institutional_holdings
{"action":"holders","cusip":"57638P104","quarter":"2025Q4","type":"positions","page_size":100}

Connect to MCP with OAuth and follow the returned pagination. Credits and usage limits depend on the account.

MCP endpoint: https://api.akkrudata.ai/mcp
API / MCP / CLI documentation: /documents
llms.txt: /llms.txt

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.