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Equibles

MTZ

Mastec Inc

Company with tickers: MTZ

CIK
15615
CUSIP
576323109
Shares Outstanding
79,018,556
13F Activity (30d)
276 filings 260 filers

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 789
Total Value: $15,216,238,519
Total Shares: 47,293,588
Showing 1–100 of 813 holdings by value · page 1 of 9

Institutional Ownership Trend

26 quarters

Superinvestors Holding MTZ

All superinvestors →
Stephen Mandel $492,600,027 Philippe Laffont $187,766,498 Daniel Loeb $102,956,800 Joel Greenblatt $54,943,539 Ray Dalio $12,914,000 George Soros $1,264,759

Holder Concentration

Across 789 13F filers · Δ vs Dec 31, 2025
Top Holder
7.6%
Sep 2023 → Mar 2026 · range 7.1% – 14.4%
+0.5 pts
Top 5
27.9%
Sep 2023 → Mar 2026 · range 26.6% – 35.2%
+1.3 pts
Top 10
43.2%
Sep 2023 → Mar 2026 · range 39.9% – 48.9%
+3.3 pts
HHI
248
Sep 2023 → Mar 2026 · range 227 – 413
Broadly held+21

Quarterly Activity

vs Dec 31, 2025
New
213
Increased
237
Decreased
234
Sold Out
70
Unchanged
105
Holder count: +143
Institutional value: +129.3%
Shares held: +54.9%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Mid PECONIC PARTNERS LLC +1,978,431 3,578,431
Large BESSEMER GROUP INC +229,129 231,965
Mega GEODE CAPITAL MANAGEMENT, LLC +151,206 1,371,909
Mega BNP PARIBAS ARBITRAGE, SA +142,307 313,383
Large Qube Research & Technologies Ltd +124,526 485,385

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Mid Third Point LLC −605,000 320,000
Large JACOBS LEVY EQUITY MANAGEMENT, INC −596,913 8,961
Mega NORDEA INVESTMENT MANAGEMENT AB −416,641 733,628
Mid Merewether Investment Management, LP −346,079 223,061
Large Holocene Advisors, LP −307,022 101,724

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega VANGUARD CAPITAL MANAGEMENT LLC 2,804,295 $902,253,873
Mega VANGUARD PORTFOLIO MANAGEMENT LLC 2,770,038 $891,232,026
Mega VICTORY CAPITAL MANAGEMENT INC 1,592,523 $512,378,350
Large LONE PINE CAPITAL LLC 1,531,050 $492,600,027
Mega BANK OF AMERICA CORP /DE/ 1,330,066 $427,935,433

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Large Blackstone Inc. 363,924 $79,106,159
Mid Cartenna Capital, LP 300,000 $65,211,000
Mid Yaupon Capital Management LP 116,993 $25,430,768
Large CAPSTONE INVESTMENT ADVISORS, LLC 100,997 $21,953,717
Small Wolf Hill Capital Management, LP 96,439 $20,962,945
Filter: New 213 Increased 237 Reduced 234 Sold out 70 Unchanged 105
Showing 100 of 813
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Mid PECONIC PARTNERS LLC $1,151,324,389 7.57% 3,578,431
Mega VANGUARD CAPITAL MANAGEMENT LLC $902,253,873 5.93% 2,804,295
Mega VANGUARD PORTFOLIO MANAGEMENT LLC $891,232,026 5.86% 2,770,038
Mid Hill City Capital, LP $693,349,700 4.56% 2,155,000
Mega STATE STREET CORP $601,585,591 3.95% 1,869,788
Mega VICTORY CAPITAL MANAGEMENT INC $512,378,350 3.37% 1,592,523
Large LONE PINE CAPITAL LLC $492,600,027 3.24% 1,531,050
Mega FIRST TRUST ADVISORS LP $454,163,036 2.98% 1,411,584
Mega GEODE CAPITAL MANAGEMENT, LLC $441,398,001 2.90% 1,371,909
Mega BANK OF AMERICA CORP /DE/ Bank $427,935,433 2.81% 1,330,066
Mid Hood River Capital Management LLC $416,777,169 2.74% 1,295,385
Mega NORDEA INVESTMENT MANAGEMENT AB $236,037,471 1.55% 733,628
Mid Electron Capital Partners, LLC $229,404,802 1.51% 713,013
Mega Bank of New York Mellon Corp Bank $211,094,892 1.39% 656,104
Mega CANADA PENSION PLAN INVESTMENT BOARD Pension $205,580,277 1.35% 638,964
Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund $194,548,776 1.28% 604,677
Large COATUE MANAGEMENT LLC $187,766,498 1.23% 583,597
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $164,487,322 1.08% 511,243
Mega MILLENNIUM MANAGEMENT LLC $161,899,246 1.06% 503,199
Large Qube Research & Technologies Ltd $156,167,769 1.03% 485,385
Mega GOLDMAN SACHS GROUP INC $152,670,133 1.00% 474,514
Mega NORTHERN TRUST CORP Bank $152,048,852 1.00% 472,583
Large Point72 Asset Management, L.P. $139,332,080 0.92% 433,058
Mega VANGUARD FIDUCIARY TRUST CO Bank $123,489,281 0.81% 383,817
Mega UBS Group AG $122,619,938 0.81% 381,115
Large NOMURA ASSET MANAGEMENT INTERNATIONAL INC. $108,691,172 0.71% 337,823
Mid 140 Summer Partners LP $105,923,242 0.70% 329,220
Mid Third Point LLC $102,956,800 0.68% 320,000
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $101,717,774 0.67% 316,149
Mega BNP PARIBAS ARBITRAGE, SA $100,827,846 0.66% 313,383
Mega CITADEL ADVISORS LLC $90,015,773 0.59% 279,778
Mid Forest Avenue Capital Management LP $86,821,860 0.57% 269,851
Large Assenagon Asset Management S.A. $82,115,126 0.54% 255,222
Large WESTFIELD CAPITAL MANAGEMENT CO LP $80,428,565 0.53% 249,980
Large BESSEMER GROUP INC $74,632,413 0.49% 231,965
Mega RAYMOND JAMES FINANCIAL INC $74,611,181 0.49% 231,899
Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP $73,126,354 0.48% 227,284
Large Squarepoint Ops LLC $72,600,631 0.48% 225,650
Mid Anomaly Capital Management, LP $72,229,986 0.47% 224,498
Mid Merewether Investment Management, LP $71,767,646 0.47% 223,061
Large Freestone Grove Partners LP $70,911,496 0.47% 220,400
Mid BOWEN HANES & CO INC $69,323,709 0.46% 215,465
Mid HENNESSY ADVISORS INC $65,988,874 0.43% 205,100
Mega JPMORGAN CHASE & CO $64,992,119 0.43% 202,002
Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE Insurance $60,471,033 0.40% 187,950
Large LORD, ABBETT & CO. LLC $59,288,316 0.39% 184,274
Mid OP Asset Management Ltd $58,985,237 0.39% 183,332
Large Vontobel Holding Ltd. $58,067,955 0.38% 180,481
Large Gotham Asset Management, LLC $54,943,539 0.36% 170,770
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $54,534,930 0.36% 169,500
Mega RHUMBLINE ADVISERS $54,088,676 0.36% 168,113
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $51,993,184 0.34% 161,600
Mega Nuveen, LLC $51,974,201 0.34% 161,541
Small KIRR MARBACH & CO LLC /IN/ $51,541,782 0.34% 160,197
Large NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO $49,123,584 0.32% 152,681
Small Goodlander Investment Management, LLC $46,652,300 0.31% 145,000
Small HILLMAN CO $46,552,238 0.31% 144,689
Mega SCHRODER INVESTMENT MANAGEMENT GROUP $46,506,871 0.31% 144,548
Large SG Americas Securities, LLC Broker-Dealer $44,660,407 0.29% 138,809
Mid SAMLYN CAPITAL, LLC $44,425,857 0.29% 138,080
Mega PRINCIPAL FINANCIAL GROUP INC $44,126,962 0.29% 137,151
Mid COUNTRY TRUST BANK Bank $42,357,392 0.28% 131,651
Large Balyasny Asset Management L.P. $41,384,772 0.27% 128,628
Mega Swiss National Bank Bank $40,539,240 0.27% 126,000
Mid ALGERT GLOBAL LLC $37,983,337 0.25% 118,056
Mega WELLS FARGO & COMPANY/MN $37,647,438 0.25% 117,012
Mega California Public Employees Retirement System Pension $37,426,083 0.25% 116,324
Small Paloma Partners Management Co $36,678,360 0.24% 114,000
Small Newbrook Capital Advisors LP $36,351,793 0.24% 112,985
Small ThornTree Capital Partners LP $36,273,289 0.24% 112,741
Mid COMMUNITY TRUST & INVESTMENT CO $35,363,407 0.23% 109,913
Large Driehaus Capital Management LLC $33,461,603 0.22% 104,002
Large Holocene Advisors, LP $32,728,679 0.22% 101,724
Small Webs Creek Capital Management LP $32,685,566 0.21% 101,590
Mega TWO SIGMA INVESTMENTS, LP $32,278,887 0.21% 100,326
Mega JENNISON ASSOCIATES LLC $32,008,625 0.21% 99,486
Mega JANE STREET GROUP, LLC $30,887,040 0.20% 96,000
Mid Brevan Howard Capital Management LP $30,458,804 0.20% 94,669
Mega ENVESTNET ASSET MANAGEMENT INC $30,419,873 0.20% 94,548
Mega JANE STREET GROUP, LLC $30,229,402 0.20% 93,956
Small Legacy Advisors, LLC $30,228,438 0.20% 93,953
Large Trexquant Investment LP $29,636,114 0.19% 92,112
Mega Legal & General Group Plc $29,555,678 0.19% 91,862
Large SEI INVESTMENTS CO $28,669,929 0.19% 89,109
Large Alyeska Investment Group, L.P. $28,147,745 0.18% 87,486
Mega ALLIANCEBERNSTEIN L.P. $27,684,118 0.18% 86,045
Large Quantinno Capital Management LP $27,150,673 0.18% 84,387
Mid COOPER CREEK PARTNERS MANAGEMENT LLC $26,931,568 0.18% 83,706
Mega CITADEL ADVISORS LLC $26,736,594 0.18% 83,100
Mid LGT Group Foundation Endowment $26,115,313 0.17% 81,169
Mega LPL Financial LLC $26,011,713 0.17% 80,847
Large TORONTO DOMINION BANK Bank $25,747,243 0.17% 80,025
Small MAKENA CAPITAL MANAGEMENT LLC $25,489,851 0.17% 79,225
Large Retirement Systems of Alabama Pension $24,193,561 0.16% 75,196
Small Arosa Capital Management LP $24,130,500 0.16% 75,000
Large Russell Investments Group, Ltd. $24,082,234 0.16% 74,850
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $23,488,306 0.15% 73,004
Mid CUSHING ASSET MANAGEMENT, LP dba NXG INVESTMENT MANAGEMENT $22,811,366 0.15% 70,900
Mid SCOPUS ASSET MANAGEMENT, L.P. $22,521,800 0.15% 70,000
Small RIPOSTE CAPITAL LLC $22,521,800 0.15% 70,000

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