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Institutional Ownership · SEC Form 13F

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-Q1 13F filings (latest filed 2026-05-18). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.

112
Institutional holders
119M
Shares held (tracked funds)

Conviction spread

MWH’s largest tracked holder by dollar value, AMERICAN SECURITIES LLC, sizes it at 70.1% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 70.1pp 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

Only one quarter (2026-Q1) of 13F history is available — a quarter-over-quarter accumulation delta needs two.

We do not publish a positioning read for a window we cannot measure honestly. A starting question, not a verdict.

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.

FundSharesReported value% of valueQuarter
AMERICAN SECURITIES LLC new91,773,571$2.8B73.6%2026-Q1
BlackRock, Inc. added2,772,967$94M2.5%2026-Q2
BALYASNY ASSET MANAGEMENT L.P. added1,472,078$50M1.3%2026-Q2
Driehaus Capital Management LLC new1,270,506$38M1.0%2026-Q1
TWO SIGMA INVESTMENTS, LP added1,035,722$35M0.9%2026-Q2
Handelsbanken Fonder AB new1,099,439$33M0.9%2026-Q1
Robeco Schweiz AG new1,004,904$30M0.8%2026-Q1
Encompass Capital Advisors LLC new1,000,400$30M0.8%2026-Q1
VANGUARD CAPITAL MANAGEMENT LLC new967,340$29M0.8%2026-Q1
JENNISON ASSOCIATES LLC new864,823$26M0.7%2026-Q1
VANGUARD PORTFOLIO MANAGEMENT LLC new834,883$25M0.7%2026-Q1
MILLENNIUM MANAGEMENT LLC trimmed695,527$24M0.6%2026-Q2
DEUTSCHE BANK AG\ new756,390$23M0.6%2026-Q1
Yaupon Capital Management LP new725,000$22M0.6%2026-Q1
Electron Capital Partners, LLC new721,298$22M0.6%2026-Q1
Covalis Capital LLP new697,110$21M0.6%2026-Q1
Point72 Asset Management, L.P. trimmed590,476$20M0.5%2026-Q2
GOLDMAN SACHS GROUP INC new662,451$20M0.5%2026-Q1
TimesSquare Capital Management, LLC new654,015$20M0.5%2026-Q1
RENAISSANCE TECHNOLOGIES LLC new560,700$19M0.5%2026-Q2
FMR LLC new528,625$18M0.5%2026-Q2
FRANKLIN RESOURCES INC new581,513$17M0.5%2026-Q1
Pictet Asset Management Holding SA new572,426$17M0.5%2026-Q1
SCOPUS ASSET MANAGEMENT, L.P. new539,045$16M0.4%2026-Q1
SOROS FUND MANAGEMENT LLC added436,664$15M0.4%2026-Q2
Aventail Capital Group, LP new492,980$15M0.4%2026-Q1
STATE STREET CORP added433,875$15M0.4%2026-Q2
DISCOVERY CAPITAL MANAGEMENT, LLC / CT new411,700$14M0.4%2026-Q2
FEDERATED HERMES, INC. new418,300$13M0.3%2026-Q1
CIBC Bancorp USA Inc. new404,000$12M0.3%2026-Q1
REAVES W H & CO INC new400,000$12M0.3%2026-Q1
Schonfeld Strategic Advisors LLC new393,792$12M0.3%2026-Q1
BNP PARIBAS ASSET MANAGEMENT Holding S.A. new379,974$11M0.3%2026-Q1
ADAGE CAPITAL PARTNERS GP, L.L.C. new379,183$11M0.3%2026-Q1
GEODE CAPITAL MANAGEMENT, LLC new324,633$10M0.3%2026-Q1
Hood River Capital Management LLC new312,255$9M0.3%2026-Q1
Invesco Ltd. added272,875$9M0.2%2026-Q2
UBS Group AG new284,857$9M0.2%2026-Q1
D. E. Shaw & Co., Inc. added243,505$8M0.2%2026-Q2
Vennlight Capital Management, LP new272,818$8M0.2%2026-Q1
Hill City Capital, LP new250,000$8M0.2%2026-Q1
TEACHER RETIREMENT SYSTEM OF TEXAS new250,000$8M0.2%2026-Q1
ExodusPoint Capital Management, LP trimmed213,617$7M0.2%2026-Q2
CITADEL ADVISORS LLC trimmed204,611$7M0.2%2026-Q2
Cinctive Capital Management LP new203,039$6M0.2%2026-Q1
CUSHING ASSET MANAGEMENT, LP dba NXG INVESTMENT MANAGEMENT new200,000$6M0.2%2026-Q1
Ghisallo Capital Management LLC new200,000$6M0.2%2026-Q1
LMR Partners LLP new190,242$6M0.2%2026-Q1
JANE STREET GROUP, LLC new166,307$5M0.1%2026-Q1
Nicholas Investment Partners, LP new164,049$5M0.1%2026-Q1
WELLINGTON MANAGEMENT GROUP LLP new142,503$5M0.1%2026-Q2
SEVEN GRAND MANAGERS, LLC new150,000$5M0.1%2026-Q1
Holocene Advisors, LP new147,388$4M0.1%2026-Q1
NORGES BANK new129,927$4M0.1%2026-Q2
Universal- Beteiligungs- und Servicegesellschaft mbH new145,611$4M0.1%2026-Q1
Burkehill Global Management, LP new140,000$4M0.1%2026-Q1
MARSHALL WACE, LLP trimmed120,638$4M0.1%2026-Q2
TUDOR INVESTMENT CORP ET AL added113,824$4M0.1%2026-Q2
VANGUARD FIDUCIARY TRUST CO new128,076$4M0.1%2026-Q1
CHARLES SCHWAB INVESTMENT MANAGEMENT INC new126,149$4M0.1%2026-Q1
Alyeska Investment Group, L.P. new120,000$4M0.1%2026-Q1
KR Capital LP new103,573$3M0.1%2026-Q1
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND new100,000$3M0.1%2026-Q1
Bridgewater Associates, LP trimmed85,060$3M0.1%2026-Q2
Asset Management One Co., Ltd. new93,589$3M0.1%2026-Q1
Atom Investors LP new83,780$3M0.1%2026-Q1
SEI INVESTMENTS CO new81,701$2M0.1%2026-Q1
BENJAMIN EDWARDS INC new74,383$2M0.1%2026-Q1
OCCUDO QUANTITATIVE STRATEGIES LP new54,889$2M0.1%2026-Q1
Arosa Capital Management LP new65,686$2M0.1%2026-Q1
Qube Research & Technologies Ltd new57,226$2M0.0%2026-Q1
Weiss Asset Management LP new51,185$2M0.0%2026-Q1
BW Gestao de Investimentos Ltda. new50,000$2M0.0%2026-Q1
Limestone Investment Advisors LP new47,500$1M0.0%2026-Q1
KAYNE ANDERSON CAPITAL ADVISORS LP new45,674$1M0.0%2026-Q1
NORTHERN TRUST CORP new44,701$1M0.0%2026-Q1
MORGAN STANLEY new44,038$1M0.0%2026-Q1
Davidson Kempner Capital Management LP new40,000$1M0.0%2026-Q1
AMERIPRISE FINANCIAL INC new37,022$1M0.0%2026-Q1
SIR Capital Management, L.P. new35,600$1M0.0%2026-Q1
ELEMENT CAPITAL MANAGEMENT LLC new32,561$978K0.0%2026-Q1
BANK OF AMERICA CORP /DE/ new31,683$951K0.0%2026-Q1
Shay Capital LLC new25,100$754K0.0%2026-Q1
TEXAS PERMANENT SCHOOL FUND CORP new25,000$751K0.0%2026-Q1
Longaeva Partners L.P. new23,317$700K0.0%2026-Q1
Legato Capital Management LLC new22,266$669K0.0%2026-Q1
PRICE T ROWE ASSOCIATES INC /MD/ new19,065$650K0.0%2026-Q2
ROYCE & ASSOCIATES LP new20,005$601K0.0%2026-Q1
READYSTATE ASSET MANAGEMENT LP new20,000$601K0.0%2026-Q1
Polymer Capital Management (US) LLC new19,000$571K0.0%2026-Q1
NEW YORK STATE COMMON RETIREMENT FUND new18,436$554K0.0%2026-Q1
NEUBERGER BERMAN GROUP LLC new17,955$539K0.0%2026-Q1
ESSEX INVESTMENT MANAGEMENT CO LLC new17,808$535K0.0%2026-Q1
Quantbot Technologies LP new16,731$502K0.0%2026-Q1
OXFORD ASSET MANAGEMENT LLP new16,482$495K0.0%2026-Q1
PRAXIS INVESTMENT MANAGEMENT INC new15,796$474K0.0%2026-Q1
Renaissance Capital LLC new10,061$401K0.0%2026-Q1
Bank of New York Mellon Corp new12,370$371K0.0%2026-Q1
U S GLOBAL INVESTORS INC new12,000$360K0.0%2026-Q1
Woodline Partners LP new10,000$300K0.0%2026-Q1

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.

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