Who owns MTZ (MTZ)
Which tracked institutional funds hold MTZ, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See MTZ 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
The tracked-fund tape on MTZ is one-sided between 2025-Q4 and 2026-Q1: 401 added or opened and 97 trimmed or exited — on balance accumulating.
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
MTZ’s largest tracked holder by dollar value, VANGUARD GROUP INC, sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.2% of theirs — a 0.1pp gap the other way — the median holder sizes MTZ more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in MTZ 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 805 tracked filers holding MTZ, 431 increased or opened the position and 342 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
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 MTZ 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 73
- VANGUARD CAPITAL MANAGEMENT LLC$903M
- VANGUARD PORTFOLIO MANAGEMENT LLC$891M
- LONE PINE CAPITAL LLC$493M
- VANGUARD FIDUCIARY TRUST CO$124M
- WESTFIELD CAPITAL MANAGEMENT CO LP$80M
- Anomaly Capital Management, LP$72M
Full exits 38
- VANGUARD GROUP INC$1.3B
- Blackstone Inc.$79M
- Cartenna Capital, LP$65M
- Yaupon Capital Management LP$25M
- CAPSTONE INVESTMENT ADVISORS, LLC$22M
- Wolf Hill Capital Management, LP$21M
Largest adds
- PECONIC PARTNERS LLC$804M
- BlackRock, Inc.$282M
- Hill City Capital, LP$225M
- STATE STREET CORP$205M
- GEODE CAPITAL MANAGEMENT, LLC$176M
- CANADA PENSION PLAN INVESTMENT BOARD$173M
Largest trims
- JACOBS LEVY EQUITY MANAGEMENT, INC$129M
- Third Point LLC$98M
- VICTORY CAPITAL MANAGEMENT INC$61M
- Holocene Advisors, LP$56M
- Legacy Advisors, LLC$53M
- Merewether Investment Management, LP$52M
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 |
|---|---|---|---|---|
| PECONIC PARTNERS LLC added | 3,578,431 | $1.2B | 8.8% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 2,770,038 | $891M | 6.8% | 2026-Q1 |
| Hill City Capital, LP | 2,155,000 | $693M | 5.3% | 2026-Q1 |
| VICTORY CAPITAL MANAGEMENT INC trimmed | 1,592,523 | $512M | 3.9% | 2026-Q1 |
| LONE PINE CAPITAL LLC new | 1,531,050 | $493M | 3.8% | 2026-Q1 |
| FIRST TRUST ADVISORS LP added | 1,411,584 | $454M | 3.5% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 1,330,066 | $428M | 3.3% | 2026-Q1 |
| Hood River Capital Management LLC trimmed | 1,295,385 | $417M | 3.2% | 2026-Q1 |
| Invesco Ltd. trimmed | 1,212,525 | $390M | 3.0% | 2026-Q1 |
| Electron Capital Partners, LLC trimmed | 713,013 | $229M | 1.8% | 2026-Q1 |
| NORDEA INVESTMENT MANAGEMENT AB trimmed | 733,628 | $229M | 1.8% | 2026-Q1 |
| Bank of New York Mellon Corp added | 656,104 | $211M | 1.6% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 659,913 | $209M | 1.6% | 2026-Q1 |
| CANADA PENSION PLAN INVESTMENT BOARD added | 638,964 | $206M | 1.6% | 2026-Q1 |
| FMR LLC trimmed | 622,131 | $200M | 1.5% | 2026-Q1 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 604,677 | $195M | 1.5% | 2026-Q1 |
| COATUE MANAGEMENT LLC trimmed | 583,597 | $188M | 1.4% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 511,243 | $164M | 1.3% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 503,199 | $162M | 1.2% | 2026-Q1 |
| Qube Research & Technologies Ltd added | 485,385 | $156M | 1.2% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 474,514 | $153M | 1.2% | 2026-Q1 |
| NORTHERN TRUST CORP added | 472,583 | $152M | 1.2% | 2026-Q1 |
| Point72 Asset Management, L.P. trimmed | 433,058 | $139M | 1.1% | 2026-Q1 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. trimmed | 337,823 | $109M | 0.8% | 2026-Q1 |
| 140 Summer Partners LP trimmed | 329,220 | $106M | 0.8% | 2026-Q1 |
| Third Point LLC trimmed | 320,000 | $103M | 0.8% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 316,149 | $102M | 0.8% | 2026-Q1 |
| Forest Avenue Capital Management LP trimmed | 269,851 | $87M | 0.7% | 2026-Q1 |
| Assenagon Asset Management S.A. added | 255,222 | $82M | 0.6% | 2026-Q1 |
| WESTFIELD CAPITAL MANAGEMENT CO LP trimmed | 249,980 | $80M | 0.6% | 2026-Q1 |
| BESSEMER GROUP INC added | 231,965 | $75M | 0.6% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC trimmed | 231,796 | $75M | 0.6% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC trimmed | 231,899 | $74M | 0.6% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 227,284 | $73M | 0.6% | 2026-Q1 |
| Squarepoint Ops LLC added | 225,650 | $73M | 0.6% | 2026-Q1 |
| Anomaly Capital Management, LP new | 224,498 | $72M | 0.6% | 2026-Q1 |
| Merewether Investment Management, LP trimmed | 223,061 | $72M | 0.6% | 2026-Q1 |
| Freestone Grove Partners LP trimmed | 220,400 | $71M | 0.5% | 2026-Q1 |
| BOWEN HANES & CO INC added | 215,465 | $69M | 0.5% | 2026-Q1 |
| OP Asset Management Ltd trimmed | 183,332 | $68M | 0.5% | 2026-Q1 |
| HENNESSY ADVISORS INC trimmed | 205,100 | $66M | 0.5% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 202,002 | $62M | 0.5% | 2026-Q1 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE trimmed | 187,950 | $60M | 0.5% | 2026-Q1 |
| LORD, ABBETT & CO. LLC trimmed | 184,274 | $59M | 0.5% | 2026-Q1 |
| Vontobel Holding Ltd. added | 180,481 | $58M | 0.4% | 2026-Q1 |
| Amundi added | 171,587 | $55M | 0.4% | 2026-Q1 |
| Gotham Asset Management, LLC trimmed | 170,770 | $55M | 0.4% | 2026-Q1 |
| Nuveen, LLC added | 161,541 | $52M | 0.4% | 2026-Q1 |
| KIRR MARBACH & CO LLC /IN/ trimmed | 160,197 | $52M | 0.4% | 2026-Q1 |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO added | 152,681 | $49M | 0.4% | 2026-Q1 |
| Goodlander Investment Management, LLC trimmed | 145,000 | $47M | 0.4% | 2026-Q1 |
| HILLMAN CO | 144,689 | $47M | 0.4% | 2026-Q1 |
| SCHRODER INVESTMENT MANAGEMENT GROUP trimmed | 144,548 | $47M | 0.4% | 2026-Q1 |
| SG Americas Securities, LLC added | 138,809 | $45M | 0.3% | 2026-Q1 |
| SAMLYN CAPITAL, LLC trimmed | 138,080 | $44M | 0.3% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC trimmed | 137,151 | $44M | 0.3% | 2026-Q1 |
| COUNTRY TRUST BANK trimmed | 131,651 | $42M | 0.3% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. added | 128,628 | $41M | 0.3% | 2026-Q1 |
| Swiss National Bank added | 126,000 | $41M | 0.3% | 2026-Q1 |
| ALGERT GLOBAL LLC trimmed | 118,056 | $38M | 0.3% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 117,012 | $38M | 0.3% | 2026-Q1 |
| California Public Employees Retirement System trimmed | 116,324 | $37M | 0.3% | 2026-Q1 |
| Newbrook Capital Advisors LP trimmed | 112,985 | $36M | 0.3% | 2026-Q1 |
| ThornTree Capital Partners LP new | 112,741 | $36M | 0.3% | 2026-Q1 |
| COMMUNITY TRUST & INVESTMENT CO trimmed | 109,913 | $35M | 0.3% | 2026-Q1 |
| Driehaus Capital Management LLC trimmed | 104,002 | $33M | 0.3% | 2026-Q1 |
| FEDERATED HERMES, INC. trimmed | 102,905 | $33M | 0.3% | 2026-Q1 |
| Holocene Advisors, LP trimmed | 101,724 | $33M | 0.3% | 2026-Q1 |
| Webs Creek Capital Management LP trimmed | 101,590 | $33M | 0.3% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 100,326 | $32M | 0.2% | 2026-Q1 |
| JENNISON ASSOCIATES LLC trimmed | 99,486 | $32M | 0.2% | 2026-Q1 |
| ENVESTNET ASSET MANAGEMENT INC added | 94,548 | $30M | 0.2% | 2026-Q1 |
| JANE STREET GROUP, LLC added | 93,956 | $30M | 0.2% | 2026-Q1 |
| Legacy Advisors, LLC trimmed | 93,953 | $30M | 0.2% | 2026-Q1 |
| Trexquant Investment LP added | 92,112 | $30M | 0.2% | 2026-Q1 |
| Legal & General Group Plc trimmed | 91,862 | $30M | 0.2% | 2026-Q1 |
| Brevan Howard Capital Management LP added | 94,669 | $29M | 0.2% | 2026-Q1 |
| SEI INVESTMENTS CO trimmed | 89,109 | $29M | 0.2% | 2026-Q1 |
| Alyeska Investment Group, L.P. added | 87,486 | $28M | 0.2% | 2026-Q1 |
| Quantinno Capital Management LP added | 84,387 | $27M | 0.2% | 2026-Q1 |
| COOPER CREEK PARTNERS MANAGEMENT LLC trimmed | 83,706 | $27M | 0.2% | 2026-Q1 |
| LGT Group Foundation added | 81,169 | $26M | 0.2% | 2026-Q1 |
| LPL Financial LLC trimmed | 80,847 | $26M | 0.2% | 2026-Q1 |
| TORONTO DOMINION BANK added | 80,025 | $26M | 0.2% | 2026-Q1 |
| MAKENA CAPITAL MANAGEMENT LLC trimmed | 79,225 | $25M | 0.2% | 2026-Q1 |
| Retirement Systems of Alabama added | 75,196 | $24M | 0.2% | 2026-Q1 |
| Russell Investments Group, Ltd. trimmed | 74,850 | $24M | 0.2% | 2026-Q1 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 73,004 | $23M | 0.2% | 2026-Q1 |
| CUSHING ASSET MANAGEMENT, LP dba NXG INVESTMENT MANAGEMENT added | 70,900 | $23M | 0.2% | 2026-Q1 |
| RIPOSTE CAPITAL LLC added | 70,000 | $23M | 0.2% | 2026-Q1 |
| ROYAL BANK OF CANADA trimmed | 68,974 | $22M | 0.2% | 2026-Q1 |
| HRT FINANCIAL LP added | 68,014 | $22M | 0.2% | 2026-Q1 |
| Zurcher Kantonalbank (Zurich Cantonalbank) trimmed | 67,367 | $22M | 0.2% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 5,846,177 | $1.3B | 9.8% | 2025-Q4 stale |
| MACQUARIE GROUP LTD trimmed | 615,973 | $131M | 1.0% | 2025-Q3 stale |
| Blackstone Inc. added | 363,924 | $79M | 0.6% | 2025-Q4 stale |
| Cartenna Capital, LP | 300,000 | $65M | 0.5% | 2025-Q4 stale |
| Orbis Allan Gray Ltd trimmed | 226,799 | $48M | 0.4% | 2025-Q3 stale |
| Yaupon Capital Management LP added | 116,993 | $25M | 0.2% | 2025-Q4 stale |
| CAPSTONE INVESTMENT ADVISORS, LLC added | 100,997 | $22M | 0.2% | 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.