Who owns MH
Which tracked institutional funds hold MH, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See MH company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 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
16 tracked funds added or opened MH while 41 trimmed or exited it between 2026-Q1 and 2026-Q2 — 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
MH’s largest tracked holder by dollar value, Platinum Equity Advisors, LLC/DE, sizes it at 14.6% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 14.6pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in MH 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 2026-Q1 and 2026-Q2, across 104 tracked filers holding MH, 57 increased or opened the position and 56 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 MH between the 2026-Q1 and 2026-Q2 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 4
- JANE STREET GROUP, LLC$4M
- Triodos Investment Management BV$2M
- Man Group plc$1M
- Jump Financial, LLC$509K
Full exits 8
- T. Rowe Price Investment Management, Inc.$99M
- Alberta Investment Management Corp$7M
- SEVEN GRAND MANAGERS, LLC$4M
- Longaeva Partners L.P.$2M
- Walleye Capital LLC$1M
- MARSHALL WACE, LLP$1M
Largest adds
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$4M
- CITADEL ADVISORS LLC$2M
- Point72 Asset Management, L.P.$1M
- CITIGROUP INC$1M
- FRANKLIN RESOURCES INC$1M
- BNP PARIBAS ASSET MANAGEMENT Holding S.A.$1M
Largest trims
- Platinum Equity Advisors, LLC/DE$958M
- AMERICAN CENTURY COMPANIES INC$15M
- Alyeska Investment Group, L.P.$10M
- BlackRock, Inc.$9M
- HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND$9M
- UBS Group AG$8M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| Platinum Equity Advisors, LLC/DE | 165,160,216 | $1.3B | 84.0% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 4,477,614 | $42M | 2.7% | 2026-Q2 |
| BlackBarn Capital Partners LP added | 2,450,000 | $23M | 1.5% | 2026-Q2 |
| BlackRock, Inc. trimmed | 1,741,124 | $16M | 1.1% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 1,668,132 | $15M | 1.0% | 2026-Q2 |
| Alyeska Investment Group, L.P. trimmed | 1,508,691 | $14M | 0.9% | 2026-Q2 |
| SCHRODER INVESTMENT MANAGEMENT GROUP added | 1,334,848 | $12M | 0.8% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC trimmed | 1,244,483 | $12M | 0.8% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 1,221,450 | $12M | 0.7% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 1,125,151 | $11M | 0.7% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 599,608 | $6M | 0.4% | 2026-Q2 |
| STATE STREET CORP added | 552,369 | $5M | 0.3% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 544,595 | $5M | 0.3% | 2026-Q2 |
| BARCLAYS PLC added | 502,081 | $5M | 0.3% | 2026-Q2 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND trimmed | 475,000 | $4M | 0.3% | 2026-Q2 |
| JANE STREET GROUP, LLC added | 462,142 | $4M | 0.3% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 422,974 | $4M | 0.3% | 2026-Q2 |
| Point72 Asset Management, L.P. added | 364,982 | $3M | 0.2% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 357,044 | $3M | 0.2% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 353,541 | $3M | 0.2% | 2026-Q2 |
| PEREGRINE CAPITAL MANAGEMENT LLC added | 351,658 | $3M | 0.2% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 315,499 | $3M | 0.2% | 2026-Q2 |
| FRANKLIN RESOURCES INC added | 306,908 | $3M | 0.2% | 2026-Q2 |
| NORTHERN TRUST CORP added | 262,615 | $2M | 0.2% | 2026-Q2 |
| MORGAN STANLEY added | 254,954 | $2M | 0.2% | 2026-Q2 |
| SEI INVESTMENTS CO added | 254,342 | $2M | 0.2% | 2026-Q2 |
| Triodos Investment Management BV new | 220,000 | $2M | 0.1% | 2026-Q2 |
| UBS Group AG trimmed | 213,142 | $2M | 0.1% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 204,480 | $2M | 0.1% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO trimmed | 180,915 | $2M | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 159,218 | $2M | 0.1% | 2026-Q2 |
| Militia Capital Management LLC added | 152,366 | $1M | 0.1% | 2026-Q2 |
| LOS ANGELES CAPITAL MANAGEMENT LLC trimmed | 142,607 | $1M | 0.1% | 2026-Q2 |
| VARCOV Co. added | 135,152 | $1M | 0.1% | 2026-Q2 |
| TD Asset Management Inc trimmed | 116,548 | $1M | 0.1% | 2026-Q2 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 114,953 | $1M | 0.1% | 2026-Q2 |
| Man Group plc added | 111,323 | $1M | 0.1% | 2026-Q2 |
| Voleon Capital Management LP trimmed | 100,825 | $955K | 0.1% | 2026-Q2 |
| Burkehill Global Management, LP | 100,000 | $947K | 0.1% | 2026-Q2 |
| Ghisallo Capital Management LLC trimmed | 100,000 | $947K | 0.1% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 69,659 | $660K | 0.0% | 2026-Q2 |
| Centiva Capital, LP added | 64,088 | $607K | 0.0% | 2026-Q2 |
| Bank of New York Mellon Corp trimmed | 61,290 | $580K | 0.0% | 2026-Q2 |
| XTX Topco Ltd added | 59,847 | $567K | 0.0% | 2026-Q2 |
| Nuveen, LLC added | 55,504 | $526K | 0.0% | 2026-Q2 |
| Jump Financial, LLC new | 53,789 | $509K | 0.0% | 2026-Q2 |
| Y-Intercept (Hong Kong) Ltd new | 52,104 | $493K | 0.0% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP trimmed | 51,110 | $484K | 0.0% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. trimmed | 44,880 | $425K | 0.0% | 2026-Q2 |
| AXQ CAPITAL, LP added | 42,737 | $405K | 0.0% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 38,220 | $362K | 0.0% | 2026-Q2 |
| Quadrature Capital Ltd added | 35,635 | $337K | 0.0% | 2026-Q2 |
| Corient Private Wealth LP new | 35,519 | $336K | 0.0% | 2026-Q2 |
| Invesco Ltd. added | 35,145 | $333K | 0.0% | 2026-Q2 |
| ZACKS INVESTMENT MANAGEMENT new | 33,094 | $313K | 0.0% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 31,299 | $296K | 0.0% | 2026-Q2 |
| Brevan Howard Capital Management LP new | 30,047 | $278K | 0.0% | 2026-Q2 |
| Squarepoint Ops LLC trimmed | 27,572 | $261K | 0.0% | 2026-Q2 |
| DARK FOREST CAPITAL MANAGEMENT LP new | 24,165 | $229K | 0.0% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 23,687 | $224K | 0.0% | 2026-Q2 |
| DEUTSCHE BANK AG\ trimmed | 23,184 | $220K | 0.0% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. new | 22,200 | $304K | 0.0% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ | 20,187 | $192K | 0.0% | 2026-Q2 |
| Aster Capital Management (DIFC) Ltd new | 16,562 | $157K | 0.0% | 2026-Q2 |
| State of Wyoming trimmed | 16,264 | $154K | 0.0% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP new | 15,538 | $147K | 0.0% | 2026-Q2 |
| MetLife Investment Management, LLC | 15,404 | $146K | 0.0% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. trimmed | 11,484 | $109K | 0.0% | 2026-Q2 |
| Engineers Gate Manager LP trimmed | 10,595 | $100K | 0.0% | 2026-Q2 |
| Park Capital Management, LLC / WI new | 10,423 | $99K | 0.0% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 10,046 | $95K | 0.0% | 2026-Q2 |
| Vanguard Global Advisers, LLC | 8,738 | $83K | 0.0% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND | 8,200 | $78K | 0.0% | 2026-Q2 |
| Police & Firemen's Retirement System of New Jersey | 7,360 | $70K | 0.0% | 2026-Q2 |
| NewEdge Advisors, LLC new | 6,150 | $58K | 0.0% | 2026-Q2 |
| Tower Research Capital LLC (TRC) added | 5,800 | $55K | 0.0% | 2026-Q2 |
| Caitong International Asset Management Co., Ltd added | 5,015 | $47K | 0.0% | 2026-Q2 |
| STRS OHIO | 4,300 | $41K | 0.0% | 2026-Q2 |
| FMR LLC added | 3,972 | $38K | 0.0% | 2026-Q2 |
| Daiwa Securities Group Inc. trimmed | 2,700 | $26K | 0.0% | 2026-Q2 |
| Legal & General Group Plc | 2,588 | $25K | 0.0% | 2026-Q2 |
| Ameritas Investment Partners, Inc. | 1,961 | $19K | 0.0% | 2026-Q2 |
| Arax Advisory Partners added | 1,406 | $13K | 0.0% | 2026-Q2 |
| ROYAL BANK OF CANADA added | 1,210 | $11K | 0.0% | 2026-Q2 |
| Parallel Advisors, LLC trimmed | 1,146 | $11K | 0.0% | 2026-Q2 |
| Farther Finance Advisors, LLC added | 1,131 | $11K | 0.0% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 343 | $3K | 0.0% | 2026-Q2 |
| EverSource Wealth Advisors, LLC trimmed | 313 | $3K | 0.0% | 2026-Q2 |
| Essential Partners LLC trimmed | 158 | $1K | 0.0% | 2026-Q2 |
| SBI Securities Co., Ltd. | 113 | $1K | 0.0% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 94 | $890 | 0.0% | 2026-Q2 |
| SIMPLEX TRADING, LLC new | 93 | $880 | 0.0% | 2026-Q2 |
| Sterling Capital Management LLC trimmed | 88 | $833 | 0.0% | 2026-Q2 |
| Integrated Wealth Concepts LLC new | 83 | $785 | 0.0% | 2026-Q2 |
| Quarry LP added | 66 | $625 | 0.0% | 2026-Q2 |
| GAMMA Investing LLC trimmed | 64 | $606 | 0.0% | 2026-Q2 |
| Investors Portfolio Services LLC new | 47 | $445 | 0.0% | 2026-Q2 |
| Allworth Financial LP trimmed | 20 | $190 | 0.0% | 2026-Q2 |
| RMG Wealth Management LLC | 12 | $139 | 0.0% | 2026-Q2 |
| PNC Financial Services Group, Inc. trimmed | 5 | $47 | 0.0% | 2026-Q2 |
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.