Who owns MBC (MBC)
Which tracked institutional funds hold MBC, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See MBC company fundamentals →
Ownership as of the 2026-Q1 13F filings. 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
33 tracked funds added or opened MBC while 79 trimmed or exited it between 2025-Q4 and 2026-Q1 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
MBC’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes MBC more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in MBC divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 334 tracked filers holding MBC, 150 increased or opened the position and 144 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in MBC between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 18
- VANGUARD CAPITAL MANAGEMENT LLC$48M
- Apollo Management Holdings, L.P.$22M
- VANGUARD PORTFOLIO MANAGEMENT LLC$20M
- Monarch Alternative Capital LP$17M
- Atlas FRM LLC$11M
- REDWOOD CAPITAL MANAGEMENT, LLC$11M
Full exits 8
- VANGUARD GROUP INC$88M
- Woodline Partners LP$8M
- 683 Capital Management, LLC$2M
- EXCHANGE TRADED CONCEPTS, LLC$1M
- TWO SIGMA ADVISERS, LP$1M
- HARRIS ASSOCIATES L P$1M
Largest adds
- Melqart Asset Management (UK) Ltd$9M
- GLAZER CAPITAL, LLC$8M
- ACK Asset Management LLC$5M
- Decagon Asset Management LLP$4M
- Quantinno Capital Management LP$3M
- PARADIGM CAPITAL MANAGEMENT INC/NY$3M
Largest trims
- Diameter Capital Partners LP$54M
- BlackRock, Inc.$53M
- Boston Partners$41M
- TEACHER RETIREMENT SYSTEM OF TEXAS$16M
- Gates Capital Management, Inc.$16M
- DIMENSIONAL FUND ADVISORS LP$14M
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. trimmed | 19,352,651 | $161M | 11.1% | 2026-Q1 |
| Coliseum Capital Management, LLC added | 12,694,710 | $105M | 7.3% | 2026-Q1 |
| Gates Capital Management, Inc. added | 10,346,864 | $86M | 6.0% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 7,010,428 | $58M | 4.0% | 2026-Q1 |
| Boston Partners trimmed | 6,727,552 | $56M | 3.9% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 5,725,492 | $48M | 3.3% | 2026-Q1 |
| Pertento Partners LLP added | 4,964,821 | $41M | 2.9% | 2026-Q1 |
| Sixth Street Partners Management Company, L.P. | 4,905,383 | $41M | 2.8% | 2026-Q1 |
| STATE STREET CORP trimmed | 4,891,066 | $41M | 2.8% | 2026-Q1 |
| FMR LLC added | 4,205,678 | $35M | 2.4% | 2026-Q1 |
| PZENA INVESTMENT MANAGEMENT LLC added | 3,814,014 | $32M | 2.2% | 2026-Q1 |
| ACK Asset Management LLC added | 3,700,000 | $31M | 2.1% | 2026-Q1 |
| COOKE & BIELER LP added | 3,594,545 | $30M | 2.1% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 3,134,245 | $26M | 1.8% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 3,098,501 | $26M | 1.8% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 3,062,879 | $25M | 1.8% | 2026-Q1 |
| Apollo Management Holdings, L.P. new | 2,638,219 | $22M | 1.5% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 2,542,961 | $21M | 1.5% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 2,457,785 | $20M | 1.4% | 2026-Q1 |
| Monarch Alternative Capital LP new | 2,000,000 | $17M | 1.2% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 1,752,263 | $15M | 1.0% | 2026-Q1 |
| CANYON CAPITAL ADVISORS LLC trimmed | 1,691,901 | $14M | 1.0% | 2026-Q1 |
| Nixon Capital, LLC added | 1,649,501 | $14M | 0.9% | 2026-Q1 |
| Decagon Asset Management LLP added | 1,546,997 | $13M | 0.9% | 2026-Q1 |
| Diameter Capital Partners LP trimmed | 1,545,571 | $13M | 0.9% | 2026-Q1 |
| STONEHILL CAPITAL MANAGEMENT LLC trimmed | 1,456,640 | $12M | 0.8% | 2026-Q1 |
| NORTHERN TRUST CORP trimmed | 1,354,929 | $11M | 0.8% | 2026-Q1 |
| Atlas FRM LLC new | 1,300,000 | $11M | 0.7% | 2026-Q1 |
| REDWOOD CAPITAL MANAGEMENT, LLC new | 1,286,097 | $11M | 0.7% | 2026-Q1 |
| MORGAN STANLEY trimmed | 1,147,497 | $10M | 0.7% | 2026-Q1 |
| PARADIGM CAPITAL MANAGEMENT INC/NY added | 1,082,091 | $9M | 0.6% | 2026-Q1 |
| Melqart Asset Management (UK) Ltd added | 1,073,202 | $9M | 0.6% | 2026-Q1 |
| De Lisle Partners LLP trimmed | 1,064,941 | $9M | 0.6% | 2026-Q1 |
| GLAZER CAPITAL, LLC added | 1,065,129 | $9M | 0.6% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 848,008 | $7M | 0.5% | 2026-Q1 |
| Marathon Asset Management Ltd added | 842,902 | $7M | 0.5% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 830,003 | $7M | 0.5% | 2026-Q1 |
| Invesco Ltd. added | 827,692 | $7M | 0.5% | 2026-Q1 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC added | 766,371 | $6M | 0.4% | 2026-Q1 |
| Polar Capital Holdings Plc trimmed | 743,646 | $6M | 0.4% | 2026-Q1 |
| UBS Group AG trimmed | 668,719 | $6M | 0.4% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 675,272 | $6M | 0.4% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC added | 616,268 | $5M | 0.4% | 2026-Q1 |
| Allianz Asset Management GmbH added | 530,131 | $4M | 0.3% | 2026-Q1 |
| VICTORY CAPITAL MANAGEMENT INC added | 520,365 | $4M | 0.3% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 506,110 | $4M | 0.3% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. added | 501,700 | $4M | 0.3% | 2026-Q1 |
| Empowered Funds, LLC added | 476,219 | $4M | 0.3% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 472,867 | $4M | 0.3% | 2026-Q1 |
| Public Sector Pension Investment Board added | 453,540 | $4M | 0.3% | 2026-Q1 |
| Pictet Asset Management Holding SA trimmed | 451,584 | $4M | 0.3% | 2026-Q1 |
| North Growth Management Ltd. added | 430,000 | $4M | 0.2% | 2026-Q1 |
| PEREGRINE CAPITAL MANAGEMENT LLC trimmed | 417,430 | $3M | 0.2% | 2026-Q1 |
| Ancora Advisors LLC trimmed | 413,023 | $3M | 0.2% | 2026-Q1 |
| Quantinno Capital Management LP added | 397,175 | $3M | 0.2% | 2026-Q1 |
| FIRST TRUST ADVISORS LP added | 382,812 | $3M | 0.2% | 2026-Q1 |
| SEI INVESTMENTS CO added | 378,361 | $3M | 0.2% | 2026-Q1 |
| MIRABELLA FINANCIAL SERVICES LLP new | 377,355 | $3M | 0.2% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 363,474 | $3M | 0.2% | 2026-Q1 |
| EVR Research LP added | 300,000 | $2M | 0.2% | 2026-Q1 |
| TEACHER RETIREMENT SYSTEM OF TEXAS trimmed | 299,995 | $2M | 0.2% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 299,762 | $2M | 0.2% | 2026-Q1 |
| Legal & General Group Plc trimmed | 294,867 | $2M | 0.2% | 2026-Q1 |
| Hudson Bay Capital Management LP new | 293,325 | $2M | 0.2% | 2026-Q1 |
| Nuveen, LLC added | 283,076 | $2M | 0.2% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC trimmed | 280,289 | $2M | 0.2% | 2026-Q1 |
| Universal- Beteiligungs- und Servicegesellschaft mbH trimmed | 255,854 | $2M | 0.1% | 2026-Q1 |
| Swiss National Bank | 249,900 | $2M | 0.1% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 239,353 | $2M | 0.1% | 2026-Q1 |
| Russell Investments Group, Ltd. trimmed | 236,588 | $2M | 0.1% | 2026-Q1 |
| ROYCE & ASSOCIATES LP trimmed | 235,570 | $2M | 0.1% | 2026-Q1 |
| Holocene Advisors, LP new | 234,433 | $2M | 0.1% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC trimmed | 233,932 | $2M | 0.1% | 2026-Q1 |
| D. E. Shaw & Co., Inc. added | 221,840 | $2M | 0.1% | 2026-Q1 |
| Polar Asset Management Partners Inc. | 213,352 | $2M | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. trimmed | 153,503 | $2M | 0.1% | 2026-Q1 |
| DENALI ADVISORS LLC | 169,100 | $1M | 0.1% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC added | 167,504 | $1M | 0.1% | 2026-Q1 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 165,489 | $1M | 0.1% | 2026-Q1 |
| TRUIST FINANCIAL CORP trimmed | 155,054 | $1M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 8,014,667 | $88M | 6.1% | 2025-Q4 stale |
| FULLER & THALER ASSET MANAGEMENT, INC. trimmed | 2,795,644 | $37M | 2.5% | 2025-Q1 stale |
| Pacer Advisors, Inc. trimmed | 1,167,688 | $15M | 1.1% | 2025-Q1 stale |
| Mawer Investment Management Ltd. added | 881,737 | $12M | 0.8% | 2025-Q1 stale |
| Woodline Partners LP added | 695,235 | $8M | 0.5% | 2025-Q4 stale |
| HENNESSY ADVISORS INC trimmed | 493,500 | $6M | 0.4% | 2025-Q1 stale |
| Brandywine Global Investment Management, LLC added | 457,431 | $6M | 0.4% | 2025-Q1 stale |
| NORGES BANK trimmed | 307,100 | $6M | 0.4% | 2025-Q3 stale |
| Foundry Partners, LLC added | 319,317 | $4M | 0.3% | 2025-Q1 stale |
| BEACONLIGHT CAPITAL, LLC new | 292,959 | $4M | 0.3% | 2025-Q3 stale |
| CSM Advisors, LLC new | 255,471 | $3M | 0.2% | 2025-Q2 stale |
| Trexquant Investment LP added | 206,603 | $3M | 0.2% | 2025-Q3 stale |
| ExodusPoint Capital Management, LP added | 184,245 | $2M | 0.2% | 2025-Q3 stale |
| STRS OHIO added | 168,100 | $2M | 0.2% | 2025-Q3 stale |
| 683 Capital Management, LLC | 200,000 | $2M | 0.2% | 2025-Q4 stale |
| WEDGE CAPITAL MANAGEMENT L L P/NC added | 166,117 | $2M | 0.2% | 2025-Q3 stale |
| LAZARD ASSET MANAGEMENT LLC added | 163,010 | $2M | 0.1% | 2025-Q3 stale |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC trimmed | 153,751 | $2M | 0.1% | 2025-Q2 stale |
| AXA Investment Managers S.A. new | 114,371 | $2M | 0.1% | 2025-Q3 stale |
| EXCHANGE TRADED CONCEPTS, LLC trimmed | 119,578 | $1M | 0.1% | 2025-Q4 stale |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.