MASTEC INC (MTZ) Institutional Shareholders
MASTEC INC (MTZ) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $18.42B in MTZ holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of MTZ tracked by InsiderSet, reporting ownership valued at approximately $2.35B in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $1.92B, representing an estimated loss of -18.23% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 46% of the total disclosed MTZ value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Peconic Partners Llc, Vanguard Capital Management Llc, and several other long-term asset managers with concentrated positions in MASTEC INC (MTZ).
This page ranks the largest institutional MTZ shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
833
Total Reported Value
$18.42B
Largest Holder
Blackrock, Inc.
Largest Position
$2.35B
Insider Transactions (90d)
1
Latest Filing Quarter
Q2 2026
New Institutional Positions
71
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.04% | 7,309,609 | $2,351,793,580 | $1,923,158,128 | -$428,635,452 | -18.23% | |
| Peconic Partners Llc | 19.92% | 3,578,431 | $1,151,324,390 | $941,485,196 | -$209,839,194 | -18.23% | |
| Vanguard Capital Management Llc | 0.02% | 2,804,295 | $902,253,873 | $737,810,015 | -$164,443,858 | -18.23% | |
| Vanguard Portfolio Management Llc | 0.05% | 2,770,038 | $891,232,026 | $728,796,998 | -$162,435,028 | -18.23% | |
| Hill City Capital, Lp | 24.77% | 2,155,000 | $693,349,700 | $566,980,500 | -$126,369,200 | -18.23% | |
| State Street Corp | 0.02% | 1,869,788 | $601,585,591 | $491,941,223 | -$109,644,368 | -18.23% | |
| Victory Capital Management Inc | 0.33% | 1,592,523 | $512,381,476 | $418,992,801 | -$93,388,675 | -18.23% | |
| Lone Pine Capital | Stephen Mandel | 3.93% | 1,531,050 | $492,600,027 | $402,819,255 | -$89,780,772 | -18.23% |
| First Trust Advisors Lp | 0.32% | 1,411,584 | $454,162,810 | $371,387,750 | -$82,775,060 | -18.23% | |
| Geode Capital Management, Llc | 0.03% | 1,371,909 | $441,485,062 | $360,949,258 | -$80,535,804 | -18.24% | |
| Bank Of America Corp | 0.03% | 1,330,066 | $427,935,435 | $349,940,365 | -$77,995,070 | -18.23% | |
| Hood River Capital Management Llc | 4.18% | 1,295,385 | $416,777,170 | $340,815,794 | -$75,961,377 | -18.23% | |
| Invesco Ltd. | 0.06% | 1,225,757 | $394,375,016 | $322,496,667 | -$71,878,349 | -18.23% | |
| Dimensional Fund Advisors Lp | 0.05% | 731,650 | $235,328,292 | $192,497,115 | -$42,831,177 | -18.20% | |
| Electron Capital Partners, Llc | 10.78% | 713,013 | $229,404,803 | $187,593,720 | -$41,811,083 | -18.23% | |
| Nordea Investment Management Ab | 0.21% | 733,628 | $228,752,547 | $193,017,527 | -$35,735,020 | -15.62% | |
| Bank Of New York Mellon Corp | 0.04% | 656,104 | $211,094,792 | $172,620,962 | -$38,473,830 | -18.23% | |
| Aqr Capital Management Llc | 0.10% | 660,054 | $209,540,584 | $173,660,207 | -$35,880,377 | -17.12% | |
| Canada Pension Plan Investment Board | 0.13% | 638,964 | $205,580,277 | $168,111,428 | -$37,468,849 | -18.23% | |
| Fmr Llc | 0.01% | 627,901 | $202,021,017 | $165,200,753 | -$36,820,264 | -18.23% | |
| Mirae Asset Global Etfs Holdings Ltd. | 0.26% | 604,677 | $194,535,836 | $159,090,519 | -$35,445,317 | -18.22% | |
| Morgan Stanley | 0.01% | 586,743 | $188,779,181 | $154,372,083 | -$34,407,098 | -18.23% | |
| Coatue Management Llc | 0.65% | 583,597 | $187,766,498 | $153,544,371 | -$34,222,127 | -18.23% | |
| Charles Schwab Investment Management Inc | 0.03% | 511,243 | $164,487,323 | $134,508,033 | -$29,979,290 | -18.23% | |
| Millennium Management Llc | 0.12% | 503,199 | $161,899,246 | $132,391,657 | -$29,507,589 | -18.23% | |
| Qube Research & Technologies Ltd | 0.22% | 485,385 | $156,167,770 | $127,704,794 | -$28,462,976 | -18.23% | |
| Goldman Sachs Group Inc | 0.02% | 474,514 | $152,670,134 | $124,844,633 | -$27,825,501 | -18.23% | |
| Northern Trust Corp | 0.02% | 472,583 | $152,048,855 | $124,336,587 | -$27,712,268 | -18.23% | |
| Point72 Asset Management, L.P. | 0.24% | 433,058 | $139,332,081 | $113,937,560 | -$25,394,521 | -18.23% | |
| Vanguard Fiduciary Trust Co | 0.03% | 383,817 | $123,489,282 | $100,982,253 | -$22,507,029 | -18.23% | |
| Ubs Group Ag | 0.02% | 381,115 | $122,619,941 | $100,271,357 | -$22,348,584 | -18.23% | |
| Nomura Asset Management International Inc. | 0.19% | 337,823 | $108,691,000 | $88,881,231 | -$19,809,769 | -18.23% | |
| 140 Summer Partners Lp | 9.35% | 329,220 | $105,923,243 | $86,617,782 | -$19,305,461 | -18.23% | |
| Third Point | Daniel Loeb | 4.94% | 320,000 | $102,956,800 | $84,192,000 | -$18,764,800 | -18.23% |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.02% | 316,149 | $101,717,779 | $83,178,802 | -$18,538,977 | -18.23% | |
| Bnp Paribas Financial Markets | 0.07% | 313,383 | $100,827,846 | $82,451,067 | -$18,376,779 | -18.23% | |
| Citadel Advisors Llc | 0.06% | 279,778 | $90,015,774 | $73,609,592 | -$16,406,182 | -18.23% | |
| Forest Avenue Capital Management Lp | 5.49% | 269,851 | $86,821,861 | $70,997,798 | -$15,824,063 | -18.23% | |
| Hennessy Advisors Inc | 2.73% | 205,100 | $85,333,906 | $53,961,810 | -$31,372,096 | -36.76% | |
| Westfield Capital Management Co Lp | 0.34% | 249,980 | $80,428,565 | $65,769,738 | -$14,658,827 | -18.23% | |
| Ameriprise Financial Inc | 0.02% | 231,796 | $74,578,141 | $60,985,528 | -$13,592,613 | -18.23% | |
| Raymond James Financial Inc | 0.02% | 231,899 | $73,701,429 | $61,012,627 | -$12,688,802 | -17.22% | |
| Arrowstreet Capital, Limited Partnership | 0.04% | 227,284 | $73,126,354 | $59,798,420 | -$13,327,934 | -18.23% | |
| Squarepoint Ops Llc | 0.16% | 225,650 | $72,600,631 | $59,368,515 | -$13,232,116 | -18.23% | |
| Anomaly Capital Management, Lp | 4.37% | 224,498 | $72,229,987 | $59,065,424 | -$13,164,563 | -18.23% | |
| Merewether Investment Management, Lp | 1.39% | 223,061 | $71,767,646 | $58,687,349 | -$13,080,297 | -18.23% | |
| Freestone Grove Partners Lp | 0.51% | 220,400 | $70,911,496 | $57,987,240 | -$12,924,256 | -18.23% | |
| Bowen Hanes & Co Inc | 1.69% | 215,465 | $69,323,709 | $56,688,842 | -$12,634,867 | -18.23% | |
| Op Asset Management Ltd | 0.69% | 154,952 | $64,469,330 | $40,767,871 | -$23,701,459 | -36.76% | |
| Manufacturers Life Insurance Company, The | 0.05% | 187,950 | $60,471,033 | $49,449,645 | -$11,021,388 | -18.23% |
Frequently asked questions about MTZ
Who owns the most MTZ stock?
The largest holders of MTZ are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for MASTEC INC (MTZ).
Is MTZ widely held by superinvestors?
Many widely followed stocks like MTZ appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly MTZ is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.