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 June 30, 2026. The institutional investors covered on this page collectively reported approximately $23.92B 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 $3.18B in its June 30, 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 $1.89B, representing an estimated loss of -40.67% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 47% 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
891
Total Reported Value
$23.92B
Largest Holder
Blackrock, Inc.
Largest Position
$3.18B
Insider Transactions (90d)
13
Latest Filing Quarter
Q2 2026
New Institutional Positions
93
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.05% | 7,638,487 | $3,178,068,993 | $1,885,560,516 | -$1,292,508,477 | -40.67% | |
| Peconic Partners Llc | 20.35% | 3,678,431 | $1,530,448,002 | $908,020,692 | -$622,427,310 | -40.67% | |
| Vanguard Capital Management Llc | 0.03% | 2,831,849 | $1,178,219,095 | $699,041,926 | -$479,177,169 | -40.67% | |
| Vanguard Portfolio Management Llc | 0.05% | 2,812,131 | $1,170,015,224 | $694,174,537 | -$475,840,687 | -40.67% | |
| State Street Corp | 0.03% | 2,244,771 | $933,959,422 | $554,121,721 | -$379,837,701 | -40.67% | |
| Hill City Capital, Lp | 22.90% | 2,155,000 | $896,609,300 | $531,961,750 | -$364,647,550 | -40.67% | |
| Jpmorgan Chase & Co | 0.03% | 1,318,161 | $566,833,829 | $325,388,043 | -$241,445,786 | -42.60% | |
| Lone Pine Capital | Stephen Mandel | 3.42% | 1,345,157 | $559,666,021 | $332,052,005 | -$227,614,016 | -40.67% |
| Bank Of America Corp | 0.04% | 1,335,924 | $555,824,540 | $329,772,839 | -$226,051,701 | -40.67% | |
| First Trust Advisors Lp | 0.33% | 1,328,399 | $552,693,126 | $327,915,293 | -$224,777,833 | -40.67% | |
| Geode Capital Management, Llc | 0.03% | 1,278,139 | $530,431,251 | $315,508,612 | -$214,922,639 | -40.52% | |
| Invesco Ltd. | 0.04% | 1,241,384 | $516,490,060 | $306,435,640 | -$210,054,420 | -40.67% | |
| Victory Capital Management Inc | 0.28% | 1,210,079 | $503,470,608 | $298,708,001 | -$204,762,607 | -40.67% | |
| Hood River Capital Management Llc | 3.54% | 1,173,918 | $488,420,323 | $289,781,658 | -$198,638,665 | -40.67% | |
| Fmr Llc | 0.02% | 890,103 | $370,336,427 | $219,721,926 | -$150,614,501 | -40.67% | |
| Ameriprise Financial Inc | 0.06% | 734,976 | $305,770,792 | $181,428,826 | -$124,341,966 | -40.67% | |
| Bank Of New York Mellon Corp | 0.05% | 674,288 | $280,544,321 | $166,447,993 | -$114,096,328 | -40.67% | |
| Mirae Asset Global Etfs Holdings Ltd. | 0.33% | 660,440 | $274,794,355 | $163,029,614 | -$111,764,741 | -40.67% | |
| Aqr Capital Management Llc | 0.10% | 657,603 | $273,602,096 | $162,329,301 | -$111,272,795 | -40.67% | |
| Morgan Stanley | 0.01% | 653,503 | $271,897,802 | $161,317,216 | -$110,580,586 | -40.67% | |
| Dimensional Fund Advisors Lp | 0.05% | 636,286 | $264,811,755 | $157,067,199 | -$107,744,556 | -40.69% | |
| Electron Capital Partners, Llc | 10.30% | 620,190 | $258,036,252 | $153,093,902 | -$104,942,351 | -40.67% | |
| Canada Pension Plan Investment Board | 0.14% | 619,910 | $257,919,755 | $153,024,784 | -$104,894,972 | -40.67% | |
| Charles Schwab Investment Management Inc | 0.03% | 551,319 | $229,381,784 | $136,093,095 | -$93,288,689 | -40.67% | |
| Sixth Street Partners Management Company, L.P. | 0.03% | 551,319 | $229,381,784 | $136,093,095 | -$93,288,689 | -40.67% | |
| Goldman Sachs Group Inc | 0.02% | 542,636 | $225,769,151 | $133,949,697 | -$91,819,454 | -40.67% | |
| Nordea Investment Management Ab | 0.18% | 529,463 | $225,455,934 | $130,697,942 | -$94,757,992 | -42.03% | |
| Northern Trust Corp | 0.03% | 517,643 | $215,370,546 | $127,780,175 | -$87,590,371 | -40.67% | |
| Coatue Management Llc | 0.44% | 517,250 | $215,207,036 | $127,683,163 | -$87,523,874 | -40.67% | |
| Ubs Group Ag | 0.03% | 509,843 | $212,125,278 | $125,854,745 | -$86,270,533 | -40.67% | |
| Bnp Paribas Financial Markets | 0.09% | 436,602 | $181,652,628 | $107,775,204 | -$73,877,424 | -40.67% | |
| Qube Research & Technologies Ltd | 0.19% | 409,202 | $170,252,584 | $101,011,514 | -$69,241,070 | -40.67% | |
| Vanguard Fiduciary Trust Co | 0.04% | 399,194 | $166,088,656 | $98,541,039 | -$67,547,617 | -40.67% | |
| Amundi | 0.04% | 399,102 | $166,050,377 | $98,518,329 | -$67,532,048 | -40.67% | |
| Westfield Capital Management Co Lp | 0.51% | 374,457 | $155,796,579 | $92,434,710 | -$63,361,869 | -40.67% | |
| Anomaly Capital Management, Lp | 4.88% | 306,921 | $127,697,551 | $75,763,449 | -$51,934,102 | -40.67% | |
| Third Point | Daniel Loeb | 2.59% | 290,000 | $120,657,400 | $71,586,500 | -$49,070,900 | -40.67% |
| 140 Summer Partners Lp | 9.04% | 268,168 | $111,573,978 | $66,197,271 | -$45,376,707 | -40.67% | |
| Forest Avenue Capital Management Lp | 4.34% | 248,627 | $103,443,750 | $61,373,575 | -$42,070,175 | -40.67% | |
| Freestone Grove Partners Lp | 0.67% | 246,593 | $102,597,484 | $60,871,482 | -$41,726,002 | -40.67% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.02% | 316,149 | $101,717,779 | $78,041,381 | -$23,676,398 | -23.28% | |
| Clearbridge Investments, Llc | 0.08% | 218,591 | $90,946,909 | $53,959,188 | -$36,987,721 | -40.67% | |
| Federated Hermes, Inc. | 0.13% | 216,660 | $90,143,561 | $53,482,521 | -$36,661,040 | -40.67% | |
| Hennessy Advisors Inc | 2.73% | 205,100 | $85,333,906 | $50,628,935 | -$34,704,971 | -40.67% | |
| Merewether Investment Management, Lp | 1.49% | 190,236 | $79,149,590 | $46,959,757 | -$32,189,833 | -40.67% | |
| Nuveen, Llc | 0.02% | 189,055 | $78,658,224 | $46,668,227 | -$31,989,997 | -40.67% | |
| Rhumbline Advisers | 0.06% | 188,673 | $78,499,224 | $46,573,930 | -$31,925,294 | -40.67% | |
| Legal & General Group Plc | 0.02% | 181,874 | $75,670,498 | $44,895,597 | -$30,774,901 | -40.67% | |
| D. E. Shaw & Co., Inc. | 0.05% | 180,243 | $74,991,902 | $44,492,985 | -$30,498,917 | -40.67% | |
| Swiss National Bank | 0.04% | 172,280 | $71,678,817 | $42,527,318 | -$29,151,499 | -40.67% |
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.