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Institutional Ownership · SEC Form 13F

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.

334
Institutional holders
154,675,465
Shares held (tracked funds)

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).

FundSharesReported value% of valueQuarter
BlackRock, Inc. trimmed19,352,651$161M11.1%2026-Q1
Coliseum Capital Management, LLC added12,694,710$105M7.3%2026-Q1
Gates Capital Management, Inc. added10,346,864$86M6.0%2026-Q1
DIMENSIONAL FUND ADVISORS LP added7,010,428$58M4.0%2026-Q1
Boston Partners trimmed6,727,552$56M3.9%2026-Q1
VANGUARD CAPITAL MANAGEMENT LLC new5,725,492$48M3.3%2026-Q1
Pertento Partners LLP added4,964,821$41M2.9%2026-Q1
Sixth Street Partners Management Company, L.P.4,905,383$41M2.8%2026-Q1
STATE STREET CORP trimmed4,891,066$41M2.8%2026-Q1
FMR LLC added4,205,678$35M2.4%2026-Q1
PZENA INVESTMENT MANAGEMENT LLC added3,814,014$32M2.2%2026-Q1
ACK Asset Management LLC added3,700,000$31M2.1%2026-Q1
COOKE & BIELER LP added3,594,545$30M2.1%2026-Q1
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added3,134,245$26M1.8%2026-Q1
GEODE CAPITAL MANAGEMENT, LLC added3,098,501$26M1.8%2026-Q1
GOLDMAN SACHS GROUP INC added3,062,879$25M1.8%2026-Q1
Apollo Management Holdings, L.P. new2,638,219$22M1.5%2026-Q1
CHARLES SCHWAB INVESTMENT MANAGEMENT INC added2,542,961$21M1.5%2026-Q1
VANGUARD PORTFOLIO MANAGEMENT LLC new2,457,785$20M1.4%2026-Q1
Monarch Alternative Capital LP new2,000,000$17M1.2%2026-Q1
RENAISSANCE TECHNOLOGIES LLC trimmed1,752,263$15M1.0%2026-Q1
CANYON CAPITAL ADVISORS LLC trimmed1,691,901$14M1.0%2026-Q1
Nixon Capital, LLC added1,649,501$14M0.9%2026-Q1
Decagon Asset Management LLP added1,546,997$13M0.9%2026-Q1
Diameter Capital Partners LP trimmed1,545,571$13M0.9%2026-Q1
STONEHILL CAPITAL MANAGEMENT LLC trimmed1,456,640$12M0.8%2026-Q1
NORTHERN TRUST CORP trimmed1,354,929$11M0.8%2026-Q1
Atlas FRM LLC new1,300,000$11M0.7%2026-Q1
REDWOOD CAPITAL MANAGEMENT, LLC new1,286,097$11M0.7%2026-Q1
MORGAN STANLEY trimmed1,147,497$10M0.7%2026-Q1
PARADIGM CAPITAL MANAGEMENT INC/NY added1,082,091$9M0.6%2026-Q1
Melqart Asset Management (UK) Ltd added1,073,202$9M0.6%2026-Q1
De Lisle Partners LLP trimmed1,064,941$9M0.6%2026-Q1
GLAZER CAPITAL, LLC added1,065,129$9M0.6%2026-Q1
Bank of New York Mellon Corp trimmed848,008$7M0.5%2026-Q1
Marathon Asset Management Ltd added842,902$7M0.5%2026-Q1
VANGUARD FIDUCIARY TRUST CO new830,003$7M0.5%2026-Q1
Invesco Ltd. added827,692$7M0.5%2026-Q1
BRIDGEWAY CAPITAL MANAGEMENT, LLC added766,371$6M0.4%2026-Q1
Polar Capital Holdings Plc trimmed743,646$6M0.4%2026-Q1
UBS Group AG trimmed668,719$6M0.4%2026-Q1
JPMORGAN CHASE & CO trimmed675,272$6M0.4%2026-Q1
PRINCIPAL FINANCIAL GROUP INC added616,268$5M0.4%2026-Q1
Allianz Asset Management GmbH added530,131$4M0.3%2026-Q1
VICTORY CAPITAL MANAGEMENT INC added520,365$4M0.3%2026-Q1
BANK OF AMERICA CORP /DE/ added506,110$4M0.3%2026-Q1
BALYASNY ASSET MANAGEMENT L.P. added501,700$4M0.3%2026-Q1
Empowered Funds, LLC added476,219$4M0.3%2026-Q1
MILLENNIUM MANAGEMENT LLC added472,867$4M0.3%2026-Q1
Public Sector Pension Investment Board added453,540$4M0.3%2026-Q1
Pictet Asset Management Holding SA trimmed451,584$4M0.3%2026-Q1
North Growth Management Ltd. added430,000$4M0.2%2026-Q1
PEREGRINE CAPITAL MANAGEMENT LLC trimmed417,430$3M0.2%2026-Q1
Ancora Advisors LLC trimmed413,023$3M0.2%2026-Q1
Quantinno Capital Management LP added397,175$3M0.2%2026-Q1
FIRST TRUST ADVISORS LP added382,812$3M0.2%2026-Q1
SEI INVESTMENTS CO added378,361$3M0.2%2026-Q1
MIRABELLA FINANCIAL SERVICES LLP new377,355$3M0.2%2026-Q1
RHUMBLINE ADVISERS added363,474$3M0.2%2026-Q1
EVR Research LP added300,000$2M0.2%2026-Q1
TEACHER RETIREMENT SYSTEM OF TEXAS trimmed299,995$2M0.2%2026-Q1
DEUTSCHE BANK AG\ added299,762$2M0.2%2026-Q1
Legal & General Group Plc trimmed294,867$2M0.2%2026-Q1
Hudson Bay Capital Management LP new293,325$2M0.2%2026-Q1
Nuveen, LLC added283,076$2M0.2%2026-Q1
AMERIPRISE FINANCIAL INC trimmed280,289$2M0.2%2026-Q1
Universal- Beteiligungs- und Servicegesellschaft mbH trimmed255,854$2M0.1%2026-Q1
Swiss National Bank249,900$2M0.1%2026-Q1
AQR CAPITAL MANAGEMENT LLC added239,353$2M0.1%2026-Q1
Russell Investments Group, Ltd. trimmed236,588$2M0.1%2026-Q1
ROYCE & ASSOCIATES LP trimmed235,570$2M0.1%2026-Q1
Holocene Advisors, LP new234,433$2M0.1%2026-Q1
AMERICAN CENTURY COMPANIES INC trimmed233,932$2M0.1%2026-Q1
D. E. Shaw & Co., Inc. added221,840$2M0.1%2026-Q1
Polar Asset Management Partners Inc.213,352$2M0.1%2026-Q1
ALLIANCEBERNSTEIN L.P. trimmed153,503$2M0.1%2026-Q1
DENALI ADVISORS LLC169,100$1M0.1%2026-Q1
RAYMOND JAMES FINANCIAL INC added167,504$1M0.1%2026-Q1
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added165,489$1M0.1%2026-Q1
TRUIST FINANCIAL CORP trimmed155,054$1M0.1%2026-Q1
VANGUARD GROUP INC trimmed8,014,667$88M6.1%2025-Q4 stale
FULLER & THALER ASSET MANAGEMENT, INC. trimmed2,795,644$37M2.5%2025-Q1 stale
Pacer Advisors, Inc. trimmed1,167,688$15M1.1%2025-Q1 stale
Mawer Investment Management Ltd. added881,737$12M0.8%2025-Q1 stale
Woodline Partners LP added695,235$8M0.5%2025-Q4 stale
HENNESSY ADVISORS INC trimmed493,500$6M0.4%2025-Q1 stale
Brandywine Global Investment Management, LLC added457,431$6M0.4%2025-Q1 stale
NORGES BANK trimmed307,100$6M0.4%2025-Q3 stale
Foundry Partners, LLC added319,317$4M0.3%2025-Q1 stale
BEACONLIGHT CAPITAL, LLC new292,959$4M0.3%2025-Q3 stale
CSM Advisors, LLC new255,471$3M0.2%2025-Q2 stale
Trexquant Investment LP added206,603$3M0.2%2025-Q3 stale
ExodusPoint Capital Management, LP added184,245$2M0.2%2025-Q3 stale
STRS OHIO added168,100$2M0.2%2025-Q3 stale
683 Capital Management, LLC200,000$2M0.2%2025-Q4 stale
WEDGE CAPITAL MANAGEMENT L L P/NC added166,117$2M0.2%2025-Q3 stale
LAZARD ASSET MANAGEMENT LLC added163,010$2M0.1%2025-Q3 stale
VOLORIDGE INVESTMENT MANAGEMENT, LLC trimmed153,751$2M0.1%2025-Q2 stale
AXA Investment Managers S.A. new114,371$2M0.1%2025-Q3 stale
EXCHANGE TRADED CONCEPTS, LLC trimmed119,578$1M0.1%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.

HoldersTotal shares

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.

Learn how to read institutional ownership