Who owns MasTec (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-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
378 tracked funds added or opened MTZ while 164 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
MTZ’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 0.1% of theirs — a 0.0pp 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 2026-Q1 and 2026-Q2, across 862 tracked filers holding MTZ, 490 increased or opened the position and 399 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
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 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 83
- Clearbridge Investments, LLC$91M
- MAPLELANE CAPITAL, LLC$37M
- Zimmer Partners, LP$35M
- AVIVA PLC$20M
- Korea Investment CORP$19M
- Vinva Investment Management Ltd$17M
Full exits 70
- CITADEL ADVISORS LLC$90M
- BESSEMER GROUP INC$75M
- LORD, ABBETT & CO. LLC$59M
- Amundi$55M
- SG Americas Securities, LLC$45M
- Holocene Advisors, LP$33M
Largest adds
- BlackRock, Inc.$1.3B
- JPMORGAN CHASE & CO$505M
- PECONIC PARTNERS LLC$379M
- STATE STREET CORP$332M
- VANGUARD PORTFOLIO MANAGEMENT LLC$279M
- VANGUARD CAPITAL MANAGEMENT LLC$276M
Largest trims
- MILLENNIUM MANAGEMENT LLC$144M
- NOMURA ASSET MANAGEMENT INTERNATIONAL INC.$84M
- Point72 Asset Management, L.P.$74M
- Squarepoint Ops LLC$62M
- MANUFACTURERS LIFE INSURANCE COMPANY, THE$44M
- NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO$43M
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 |
|---|---|---|---|---|
| BlackRock, Inc. added | 7,638,487 | $3.2B | 14.8% | 2026-Q2 |
| PECONIC PARTNERS LLC added | 3,678,431 | $1.5B | 7.1% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 2,831,849 | $1.2B | 5.5% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 2,812,131 | $1.2B | 5.4% | 2026-Q2 |
| STATE STREET CORP added | 2,244,771 | $934M | 4.3% | 2026-Q2 |
| Hill City Capital, LP | 2,155,000 | $897M | 4.2% | 2026-Q2 |
| LONE PINE CAPITAL LLC trimmed | 1,345,157 | $560M | 2.6% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 1,335,924 | $556M | 2.6% | 2026-Q2 |
| FIRST TRUST ADVISORS LP trimmed | 1,328,399 | $553M | 2.6% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 1,318,161 | $567M | 2.6% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 1,278,139 | $530M | 2.5% | 2026-Q2 |
| Invesco Ltd. added | 1,241,384 | $516M | 2.4% | 2026-Q2 |
| VICTORY CAPITAL MANAGEMENT INC trimmed | 1,210,079 | $503M | 2.3% | 2026-Q2 |
| Hood River Capital Management LLC trimmed | 1,173,918 | $488M | 2.3% | 2026-Q2 |
| FMR LLC added | 890,103 | $370M | 1.7% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 734,976 | $306M | 1.4% | 2026-Q2 |
| Bank of New York Mellon Corp added | 674,288 | $281M | 1.3% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 660,440 | $275M | 1.3% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 657,603 | $274M | 1.3% | 2026-Q2 |
| MORGAN STANLEY added | 653,503 | $272M | 1.3% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 636,286 | $265M | 1.2% | 2026-Q2 |
| Electron Capital Partners, LLC trimmed | 620,190 | $258M | 1.2% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD trimmed | 619,910 | $258M | 1.2% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 551,319 | $229M | 1.1% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 542,636 | $226M | 1.0% | 2026-Q2 |
| NORDEA INVESTMENT MANAGEMENT AB trimmed | 529,463 | $225M | 1.0% | 2026-Q2 |
| NORTHERN TRUST CORP added | 517,643 | $215M | 1.0% | 2026-Q2 |
| COATUE MANAGEMENT LLC trimmed | 517,250 | $215M | 1.0% | 2026-Q2 |
| UBS Group AG added | 509,843 | $212M | 1.0% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 436,602 | $182M | 0.8% | 2026-Q2 |
| Qube Research & Technologies Ltd trimmed | 409,202 | $170M | 0.8% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 403,709 | $168M | 0.8% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 399,194 | $166M | 0.8% | 2026-Q2 |
| WESTFIELD CAPITAL MANAGEMENT CO LP added | 374,457 | $156M | 0.7% | 2026-Q2 |
| Anomaly Capital Management, LP added | 306,921 | $128M | 0.6% | 2026-Q2 |
| Third Point LLC trimmed | 290,000 | $121M | 0.6% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 282,436 | $118M | 0.5% | 2026-Q2 |
| 140 Summer Partners LP trimmed | 268,168 | $112M | 0.5% | 2026-Q2 |
| Forest Avenue Capital Management LP trimmed | 248,627 | $103M | 0.5% | 2026-Q2 |
| Freestone Grove Partners LP added | 246,593 | $103M | 0.5% | 2026-Q2 |
| Clearbridge Investments, LLC new | 218,591 | $91M | 0.4% | 2026-Q2 |
| FEDERATED HERMES, INC. added | 216,660 | $90M | 0.4% | 2026-Q2 |
| BOWEN HANES & CO INC | 215,465 | $69M | 0.3% | 2026-Q2 |
| HENNESSY ADVISORS INC | 205,100 | $85M | 0.4% | 2026-Q2 |
| Merewether Investment Management, LP trimmed | 190,236 | $79M | 0.4% | 2026-Q2 |
| Nuveen, LLC added | 189,055 | $79M | 0.4% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 188,673 | $78M | 0.4% | 2026-Q2 |
| Legal & General Group Plc added | 181,874 | $76M | 0.4% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 180,243 | $75M | 0.3% | 2026-Q2 |
| Swiss National Bank added | 172,280 | $72M | 0.3% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 166,345 | $69M | 0.3% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC trimmed | 165,376 | $69M | 0.3% | 2026-Q2 |
| Point72 Asset Management, L.P. trimmed | 156,309 | $65M | 0.3% | 2026-Q2 |
| OP Asset Management Ltd trimmed | 154,952 | $64M | 0.3% | 2026-Q2 |
| Gotham Asset Management, LLC trimmed | 151,587 | $63M | 0.3% | 2026-Q2 |
| TORTOISE CAPITAL ADVISORS, L.L.C. added | 143,731 | $60M | 0.3% | 2026-Q2 |
| COUNTRY TRUST BANK added | 141,500 | $59M | 0.3% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 139,227 | $58M | 0.3% | 2026-Q2 |
| Quantinno Capital Management LP added | 136,950 | $57M | 0.3% | 2026-Q2 |
| Newbrook Capital Advisors LP added | 134,430 | $56M | 0.3% | 2026-Q2 |
| KIRR MARBACH & CO LLC /IN/ trimmed | 133,726 | $56M | 0.3% | 2026-Q2 |
| HILLMAN CO trimmed | 130,909 | $54M | 0.3% | 2026-Q2 |
| Assenagon Asset Management S.A. trimmed | 129,199 | $54M | 0.2% | 2026-Q2 |
| California Public Employees Retirement System added | 126,663 | $53M | 0.2% | 2026-Q2 |
| Vontobel Holding Ltd. trimmed | 125,301 | $52M | 0.2% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 125,069 | $52M | 0.2% | 2026-Q2 |
| Sumitomo Mitsui Trust Group, Inc. added | 124,282 | $52M | 0.2% | 2026-Q2 |
| Legacy Advisors, LLC added | 124,181 | $52M | 0.2% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 119,416 | $50M | 0.2% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 118,727 | $49M | 0.2% | 2026-Q2 |
| SEI INVESTMENTS CO added | 116,639 | $49M | 0.2% | 2026-Q2 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND added | 112,100 | $47M | 0.2% | 2026-Q2 |
| BARCLAYS PLC added | 108,074 | $45M | 0.2% | 2026-Q2 |
| Goodlander Investment Management, LLC trimmed | 105,000 | $44M | 0.2% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC added | 103,679 | $43M | 0.2% | 2026-Q2 |
| SAMLYN CAPITAL, LLC trimmed | 100,636 | $42M | 0.2% | 2026-Q2 |
| JENNISON ASSOCIATES LLC trimmed | 93,701 | $39M | 0.2% | 2026-Q2 |
| LPL Financial LLC added | 93,274 | $39M | 0.2% | 2026-Q2 |
| ROYAL BANK OF CANADA added | 91,680 | $38M | 0.2% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 89,451 | $37M | 0.2% | 2026-Q2 |
| MAPLELANE CAPITAL, LLC trimmed | 88,800 | $37M | 0.2% | 2026-Q2 |
| ThornTree Capital Partners LP trimmed | 87,828 | $37M | 0.2% | 2026-Q2 |
| HSBC HOLDINGS PLC added | 86,514 | $36M | 0.2% | 2026-Q2 |
| LGT Group Foundation added | 85,310 | $35M | 0.2% | 2026-Q2 |
| Zimmer Partners, LP new | 85,000 | $35M | 0.2% | 2026-Q2 |
| CUSHING ASSET MANAGEMENT, LP dba NXG INVESTMENT MANAGEMENT added | 82,800 | $34M | 0.2% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. trimmed | 80,697 | $26M | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 78,536 | $33M | 0.2% | 2026-Q2 |
| COMMUNITY TRUST & INVESTMENT CO trimmed | 73,763 | $31M | 0.1% | 2026-Q2 |
| SCHRODER INVESTMENT MANAGEMENT GROUP trimmed | 72,508 | $30M | 0.1% | 2026-Q2 |
| Mitsubishi UFJ Asset Management Co., Ltd. added | 70,661 | $29M | 0.1% | 2026-Q2 |
| Webs Creek Capital Management LP trimmed | 70,080 | $29M | 0.1% | 2026-Q2 |
| Russell Investments Group, Ltd. trimmed | 68,776 | $29M | 0.1% | 2026-Q2 |
| Tidal Investments LLC added | 67,844 | $28M | 0.1% | 2026-Q2 |
| Retirement Systems of Alabama trimmed | 63,728 | $27M | 0.1% | 2026-Q2 |
| SCOPUS ASSET MANAGEMENT, L.P. added | 62,944 | $26M | 0.1% | 2026-Q2 |
| Asset Management One Co., Ltd. added | 61,451 | $26M | 0.1% | 2026-Q2 |
| MAKENA CAPITAL MANAGEMENT LLC trimmed | 60,452 | $25M | 0.1% | 2026-Q2 |
| AGF MANAGEMENT LTD added | 59,500 | $25M | 0.1% | 2026-Q2 |
| DANSKE BANK A/S added | 58,959 | $25M | 0.1% | 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.