Who owns MWH
Which tracked institutional funds hold MWH, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See MWH 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
101 tracked funds added or opened MWH while 35 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
MWH’s largest tracked holder by dollar value, AMERICAN SECURITIES LLC, sizes it at 75.2% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 75.2pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in MWH 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 172 tracked filers holding MWH, 146 increased or opened the position and 48 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 MWH 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 48
- FRED ALGER MANAGEMENT, LLC$77M
- JPMORGAN CHASE & CO$33M
- Wealth High Governance Asset Management Ltda.$20M
- RENAISSANCE TECHNOLOGIES LLC$19M
- NEUMEIER POMA INVESTMENT COUNSEL LLC$18M
- FMR LLC$18M
Full exits 20
- Handelsbanken Fonder AB$33M
- Encompass Capital Advisors LLC$30M
- CIBC Bancorp USA Inc.$12M
- Schonfeld Strategic Advisors LLC$12M
- ADAGE CAPITAL PARTNERS GP, L.L.C.$11M
- TEACHER RETIREMENT SYSTEM OF TEXAS$8M
Largest adds
- BlackRock, Inc.$75M
- AMERICAN SECURITIES LLC$67M
- Robeco Schweiz AG$60M
- Driehaus Capital Management LLC$43M
- BALYASNY ASSET MANAGEMENT L.P.$32M
- TWO SIGMA INVESTMENTS, LP$28M
Largest trims
- Point72 Asset Management, L.P.$39M
- REAVES W H & CO INC$9M
- MILLENNIUM MANAGEMENT LLC$9M
- CITADEL ADVISORS LLC$8M
- Covalis Capital LLP$7M
- MARSHALL WACE, LLP$6M
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 |
|---|---|---|---|---|
| AMERICAN SECURITIES LLC trimmed | 82,920,401 | $2.8B | 65.0% | 2026-Q2 |
| BlackRock, Inc. added | 2,772,967 | $94M | 2.2% | 2026-Q2 |
| Robeco Schweiz AG added | 2,641,405 | $90M | 2.1% | 2026-Q2 |
| Driehaus Capital Management LLC added | 2,378,054 | $81M | 1.9% | 2026-Q2 |
| FRED ALGER MANAGEMENT, LLC new | 2,272,871 | $77M | 1.8% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 1,617,598 | $55M | 1.3% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 1,520,337 | $52M | 1.2% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. added | 1,472,078 | $50M | 1.2% | 2026-Q2 |
| JENNISON ASSOCIATES LLC added | 1,168,757 | $40M | 0.9% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 1,035,722 | $35M | 0.8% | 2026-Q2 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 996,354 | $34M | 0.8% | 2026-Q2 |
| JPMORGAN CHASE & CO new | 923,813 | $33M | 0.8% | 2026-Q2 |
| Aventail Capital Group, LP added | 853,960 | $29M | 0.7% | 2026-Q2 |
| SCOPUS ASSET MANAGEMENT, L.P. added | 801,011 | $27M | 0.6% | 2026-Q2 |
| UBS Group AG added | 767,550 | $26M | 0.6% | 2026-Q2 |
| Yaupon Capital Management LP added | 750,000 | $26M | 0.6% | 2026-Q2 |
| Electron Capital Partners, LLC added | 749,386 | $26M | 0.6% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 737,119 | $25M | 0.6% | 2026-Q2 |
| FRANKLIN RESOURCES INC added | 715,343 | $24M | 0.6% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 695,527 | $24M | 0.5% | 2026-Q2 |
| TimesSquare Capital Management, LLC added | 654,248 | $22M | 0.5% | 2026-Q2 |
| Point72 Asset Management, L.P. trimmed | 590,476 | $20M | 0.5% | 2026-Q2 |
| Wealth High Governance Asset Management Ltda. new | 579,148 | $20M | 0.5% | 2026-Q2 |
| DEUTSCHE BANK AG\ trimmed | 577,183 | $20M | 0.5% | 2026-Q2 |
| FEDERATED HERMES, INC. added | 574,500 | $20M | 0.5% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 566,274 | $19M | 0.4% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC new | 560,700 | $19M | 0.4% | 2026-Q2 |
| Walleye Capital LLC added | 553,432 | $19M | 0.4% | 2026-Q2 |
| NEUMEIER POMA INVESTMENT COUNSEL LLC new | 538,040 | $18M | 0.4% | 2026-Q2 |
| FMR LLC new | 528,625 | $18M | 0.4% | 2026-Q2 |
| CUSHING ASSET MANAGEMENT, LP dba NXG INVESTMENT MANAGEMENT added | 520,000 | $18M | 0.4% | 2026-Q2 |
| LMR Partners LLP added | 515,991 | $18M | 0.4% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS new | 501,960 | $17M | 0.4% | 2026-Q2 |
| Ghisallo Capital Management LLC added | 500,000 | $17M | 0.4% | 2026-Q2 |
| Pictet Asset Management Holding SA trimmed | 497,283 | $17M | 0.4% | 2026-Q2 |
| Hood River Capital Management LLC added | 467,156 | $16M | 0.4% | 2026-Q2 |
| SOROS FUND MANAGEMENT LLC added | 436,664 | $15M | 0.3% | 2026-Q2 |
| STATE STREET CORP added | 433,875 | $15M | 0.3% | 2026-Q2 |
| BW Gestao de Investimentos Ltda. added | 419,201 | $14M | 0.3% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 414,667 | $14M | 0.3% | 2026-Q2 |
| DISCOVERY CAPITAL MANAGEMENT, LLC / CT new | 411,700 | $14M | 0.3% | 2026-Q2 |
| Burkehill Global Management, LP added | 400,000 | $14M | 0.3% | 2026-Q2 |
| Covalis Capital LLP trimmed | 400,000 | $14M | 0.3% | 2026-Q2 |
| SEVEN GRAND MANAGERS, LLC added | 400,000 | $14M | 0.3% | 2026-Q2 |
| LOS ANGELES CAPITAL MANAGEMENT LLC new | 375,409 | $13M | 0.3% | 2026-Q2 |
| Cinctive Capital Management LP added | 368,697 | $13M | 0.3% | 2026-Q2 |
| Alyeska Investment Group, L.P. added | 336,651 | $11M | 0.3% | 2026-Q2 |
| BROWN ADVISORY INC new | 297,196 | $10M | 0.2% | 2026-Q2 |
| Ninety One UK Ltd new | 293,121 | $10M | 0.2% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC new | 291,099 | $10M | 0.2% | 2026-Q2 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND added | 285,000 | $10M | 0.2% | 2026-Q2 |
| Invesco Ltd. added | 272,875 | $9M | 0.2% | 2026-Q2 |
| Hill City Capital, LP | 250,000 | $9M | 0.2% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 243,505 | $8M | 0.2% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 231,373 | $8M | 0.2% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 222,956 | $8M | 0.2% | 2026-Q2 |
| Wealth High Governance Capital Ltda new | 220,852 | $8M | 0.2% | 2026-Q2 |
| ExodusPoint Capital Management, LP trimmed | 213,617 | $7M | 0.2% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 204,611 | $7M | 0.2% | 2026-Q2 |
| Centiva Capital, LP new | 195,503 | $7M | 0.2% | 2026-Q2 |
| Universal- Beteiligungs- und Servicegesellschaft mbH added | 192,585 | $7M | 0.2% | 2026-Q2 |
| CenterBook Partners LP new | 188,790 | $6M | 0.1% | 2026-Q2 |
| Longaeva Partners L.P. added | 166,390 | $6M | 0.1% | 2026-Q2 |
| NORTHERN TRUST CORP added | 164,695 | $6M | 0.1% | 2026-Q2 |
| Asset Management One Co., Ltd. added | 151,416 | $5M | 0.1% | 2026-Q2 |
| SEI INVESTMENTS CO added | 145,565 | $5M | 0.1% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP new | 142,503 | $5M | 0.1% | 2026-Q2 |
| NORGES BANK new | 129,927 | $4M | 0.1% | 2026-Q2 |
| MARSHALL WACE, LLP trimmed | 120,638 | $4M | 0.1% | 2026-Q2 |
| XTX Topco Ltd new | 119,504 | $4M | 0.1% | 2026-Q2 |
| Squarepoint Ops LLC added | 118,555 | $4M | 0.1% | 2026-Q2 |
| TUDOR INVESTMENT CORP ET AL added | 113,824 | $4M | 0.1% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 109,682 | $4M | 0.1% | 2026-Q2 |
| Bank of New York Mellon Corp added | 98,660 | $3M | 0.1% | 2026-Q2 |
| SCHRODER INVESTMENT MANAGEMENT GROUP new | 94,937 | $3M | 0.1% | 2026-Q2 |
| Zurcher Kantonalbank (Zurich Cantonalbank) new | 89,886 | $3M | 0.1% | 2026-Q2 |
| Hel Ved Capital Management Ltd new | 87,000 | $3M | 0.1% | 2026-Q2 |
| Bridgewater Associates, LP trimmed | 85,060 | $3M | 0.1% | 2026-Q2 |
| Diameter Capital Partners LP new | 80,000 | $3M | 0.1% | 2026-Q2 |
| MYDA Advisors LLC new | 80,000 | $3M | 0.1% | 2026-Q2 |
| REAVES W H & CO INC trimmed | 75,000 | $3M | 0.1% | 2026-Q2 |
| Vennlight Capital Management, LP trimmed | 70,342 | $2M | 0.1% | 2026-Q2 |
| Ninety One North America, Inc. new | 67,995 | $2M | 0.1% | 2026-Q2 |
| Potrero Capital Research LLC new | 65,941 | $2M | 0.1% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC added | 63,453 | $2M | 0.0% | 2026-Q2 |
| ALPS ADVISORS INC new | 60,700 | $2M | 0.0% | 2026-Q2 |
| Qube Research & Technologies Ltd trimmed | 54,674 | $2M | 0.0% | 2026-Q2 |
| BENJAMIN EDWARDS INC trimmed | 52,816 | $2M | 0.0% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC new | 49,572 | $2M | 0.0% | 2026-Q2 |
| Tidal Investments LLC new | 49,206 | $2M | 0.0% | 2026-Q2 |
| Swiss National Bank new | 47,500 | $2M | 0.0% | 2026-Q2 |
| Nuveen, LLC new | 46,752 | $2M | 0.0% | 2026-Q2 |
| Defiance ETFs, LLC new | 44,741 | $1M | 0.0% | 2026-Q2 |
| MORGAN STANLEY trimmed | 37,162 | $1M | 0.0% | 2026-Q2 |
| RHUMBLINE ADVISERS new | 34,497 | $1M | 0.0% | 2026-Q2 |
| Freestone Grove Partners LP new | 31,772 | $1M | 0.0% | 2026-Q2 |
| ESSEX INVESTMENT MANAGEMENT CO LLC added | 30,436 | $1M | 0.0% | 2026-Q2 |
| READYSTATE ASSET MANAGEMENT LP added | 30,000 | $1M | 0.0% | 2026-Q2 |
| Man Group plc new | 29,114 | $991K | 0.0% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM new | 26,723 | $910K | 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.