Vault-13

MASTEC INC MTZ

COM · Common Stock · CUSIP 576323109 · ISIN US5763231090

Infrastructure and construction company

338 institutional holders
55,114,80855.1m shares reported held*
70.4% of all shares outstanding*
$3.5bnreported value*

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($15.3m this quarter). Holder counts are more reliable. Shares outstanding: 78.2m as of 2022-10-31, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $63.74. Options: 13 managers hold calls ($13.4m notional), 11 hold puts ($15.8m).

Biggest calls

SUSQUEHANNA INTERNATIONAL GROUP, LLP — $4.5m70.8k shares
CITADEL ADVISORS LLC — $3.2m49.8k shares
Caption Management, LLC — $1.6m25.0k shares
Walleye Trading LLC — $1.2m18.9k shares
JANE STREET GROUP, LLC — $718.0k11.3k shares
WOLVERINE TRADING, LLC — $708.0k10.8k shares
PEAK6 Investments LLC — $610.0k9.6k shares
HSBC HOLDINGS PLC — $344.0k5.3k shares
SIMPLEX TRADING, LLC — $336.0k5.3k shares
TWO SIGMA SECURITIES, LLC — $229.0k3.6k shares

Biggest puts

SUSQUEHANNA INTERNATIONAL GROUP, LLP — $4.3m68.0k shares
CITADEL ADVISORS LLC — $3.9m61.5k shares
Walleye Trading LLC — $2.4m37.6k shares
PEAK6 Investments LLC — $2.4m37.5k shares
JANE STREET GROUP, LLC — $1.5m23.5k shares
SIMPLEX TRADING, LLC — $768.0k12.1k shares
WOLVERINE TRADING, LLC — $249.0k3.8k shares
HSBC HOLDINGS PLC — $175.0k2.7k shares
GROUP ONE TRADING LLC — $70.0k1.1k shares
Cutler Group LLC / CA — $4.0k300 shares

Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

HolderStakeChangeShares Last filed
MAS JORGE 13D · may seek influence -0.2 pts · filed 2026-08-13
Stated purposeThe purpose of this filing to is report the entry by JM Holdings I on August 10, 2026 into an amendment (the "Fourth Amendment") to the previously reported prepaid variable forward sale contract entered into by JM Holdings I with an unaffiliated party (the "2019 Prepaid Forward Contract," and, as amended to date, the "Prepaid Forward Contract"). The Fourth Amendment amends the Floor Price (as defined below) and Cap Price (as defined below) for each Tranche 1 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on August 11, 2026. The Prepaid Forward Contract provides for the settlement of the transaction, at the option of JM Holdings I, in cash or in Shares. At settlement JM … Full filing
14.8% -0.2 pts 11.9m≈ $4.9bn 2026-08-13
BlackRock, Inc. 13G · institution +1.3 pts · filed 2026-07-29 8.1% +1.3 pts 6.4m≈ $2.7bn 2026-07-29
MAS JOSE RAMON 13D · may seek influence -0.1 pts · filed 2026-08-13
Stated purposeThe purpose of this filing to is report entry by Jose Ramon Mas on August 10, 2026 into an amendment (the "Fourth Amendment") to the previously reported prepaid variable forward sale contract entered into by Jose Ramon Mas with an unaffiliated party (the "JR 2019 Prepaid Forward Contract," and, as amended to date, the "Prepaid Forward Contract"). The Fourth Amendment amends the Floor Price (as defined below) and Cap Price (as defined below) for each Tranche 2 Component (as defined below), which were determined based on the volume weighted average price (the "VWAP") of MasTec, Inc.'s common stock for a specified period ended on August 11, 2026. The Prepaid Forward Contract provides for the settlement of the transaction, at the option of Jose Ramon Mas, in cash or in Shares. At settlement J… Full filing
7.7% -0.1 pts 6.2m≈ $2.6bn 2026-08-13

Fell to 5% or below in the last year: VANGUARD GROUP INC (0.0%, 2026-03-27)

Insider purchases and sales in Q3 2022

Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.

None reported in Q3 2022.

Holders, Q3 2022

#ManagerLocationShares Value% of their portfolioChangeShares change
1 VANGUARD GROUP INC 0.01% of their portfolio Valley Forge, PA 5,335,6465.3m $338.8m $338.8m 0.01% —
2 BlackRock Inc. 0.01% of their portfolio New York, NY 5,209,3535.2m $330.8m $330.8m 0.01% —
3 Allspring Global Investments Holdings, LLC 0.37% of their portfolio CHARLOTTE, NC 3,306,5803.3m $210.0m $210.0m 0.37% —
4 NORDEA INVESTMENT MANAGEMENT AB 0.35% of their portfolio STOCKHOLM, V7 3,208,6483.2m $214.4m $214.4m 0.35% —
5 DIMENSIONAL FUND ADVISORS LP 0.06% of their portfolio AUSTIN, TX 2,478,2222.5m $157.4m $157.4m 0.06% —
6 MACQUARIE GROUP LTD 0.18% of their portfolio Sydney, NSW 2000, C3 2,359,0042.4m $149.8m $149.8m 0.18% —
7 Legacy Advisors, LLC 25.63% of their portfolio PLYMOUTH MEETING, PA 1,827,6961.8m $116.1m $116.1m 25.63% —
8 AMERIPRISE FINANCIAL INC 0.04% of their portfolio MINNEAPOLIS, MN 1,820,4891.8m $115.6m $115.6m 0.04% —
9 FRONTIER CAPITAL MANAGEMENT CO LLC 1.19% of their portfolio Boston, MA 1,595,5951.6m $101.3m $101.3m 1.19% —
10 STATE STREET CORP 0.01% of their portfolio BOSTON, MA 1,525,3281.5m $96.9m $96.9m 0.01% —
11 Invesco Ltd. 0.03% of their portfolio ATLANTA, GA 1,428,2001.4m $90.7m $90.7m 0.03% —
12 Electron Capital Partners, LLC 4.01% of their portfolio NEW YORK, NY 1,320,3991.3m $83.8m $83.8m 4.01% —
13 Hood River Capital Management LLC 2.56% of their portfolio PALM BEACH GARDENS, FL 1,056,3331.1m $67.1m $67.1m 2.56% —
14 PZENA INVESTMENT MANAGEMENT LLC 0.28% of their portfolio NEW YORK, NY 898,809898.8k $57.1m $57.1m 0.28% —
15 GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio BOSTON, MA 748,810748.8k $47.5m $47.5m 0.01% —
16 MARSHALL WACE, LLP 0.11% of their portfolio LONDON, X0 691,959692.0k $43.9m $43.9m 0.11% —
17 GOLDMAN SACHS GROUP INC 0.01% of their portfolio NEW YORK, NY 666,433666.4k $42.3m $42.3m 0.01% —
18 Handelsbanken Fonder AB 0.27% of their portfolio STOCKHOLM, V7 643,500643.5k $40.9m $40.9m 0.27% —
19 Point72 Asset Management, L.P. 0.17% of their portfolio STAMFORD, CT 602,850602.9k $38.3m $38.3m 0.17% —
20 Bank of New York Mellon Corp 0.01% of their portfolio NEW YORK, NY 541,803541.8k $34.4m $34.4m 0.01% —
21 CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio SAN FRANCISCO, CA 538,663538.7k $34.2m $34.2m 0.01% —
22 Candriam S.C.A. 0.24% of their portfolio STRASSEN, N4 533,274533.3k $33.9m $33.9m 0.24% —
23 NORGES BANK 0.01% of their portfolio OSLO, Q8 470,401470.4k $29.9m $29.9m 0.01% —
24 NORTHERN TRUST CORP 0.01% of their portfolio CHICAGO, IL 466,987467.0k $29.7m $29.7m 0.01% —
25 CREDIT SUISSE AG/ 0.03% of their portfolio ZURICH, V8 455,187455.2k $28.9m $28.9m 0.03% —
26 Alyeska Investment Group, L.P. 0.32% of their portfolio CHICAGO, IL 434,846434.8k $27.6m $27.6m 0.32% —
27 M.D. Sass, LLC 5.05% of their portfolio New York, NY 433,402433.4k $27.5m $27.5m 5.05% —
28 FMR LLC 0.00% of their portfolio BOSTON, MA 430,885430.9k $27.4m $27.4m 0.00% —
29 DekaBank Deutsche Girozentrale 0.08% of their portfolio FRANKFURT, 2M 423,100423.1k $27.5m $27.5m 0.08% —
30 DNB Asset Management AS 0.18% of their portfolio Oslo, Q8 376,114376.1k $23.9m $23.9m 0.18% —
31 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 374,379374.4k $23.8m $23.8m 0.00% —
32 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 358,539358.5k $22.8m $22.8m 0.00% —
33 KORNITZER CAPITAL MANAGEMENT INC /KS 0.49% of their portfolio SHAWNEE MISSION, KS 357,299357.3k $22.7m $22.7m 0.49% —
34 Orbis Allan Gray Ltd 0.17% of their portfolio HamiltoN, D0 328,349328.3k $20.9m $20.9m 0.17% —
35 BANK OF AMERICA CORP /DE/ 0.00% of their portfolio CHARLOTTE, NC 322,650322.6k $20.5m $20.5m 0.00% —
36 Swedbank AB 0.05% of their portfolio STOCKHOLM, V7 319,500319.5k $20.3m $20.3m 0.05% —
37 Mirae Asset Global Investments Co., Ltd. 0.05% of their portfolio SEOUL, M5 310,947310.9k $19.7m $19.7m 0.05% —
38 ACK Asset Management LLC 5.13% of their portfolio GREENWICH, CT 305,000305.0k $19.4m $19.4m 5.13% —
39 EDMOND DE ROTHSCHILD HOLDING S.A. 0.51% of their portfolio CHAMBESY, V8 302,162302.2k $19.2m $19.2m 0.51% —
40 FIRST TRUST ADVISORS LP 0.02% of their portfolio Wheaton, IL 290,039290.0k $18.4m $18.4m 0.02% —
41 COUNTRY TRUST BANK 0.55% of their portfolio Bloomington, IL 274,777274.8k $17.4m $17.4m 0.55% —
42 ExodusPoint Capital Management, LP 0.24% of their portfolio NEW YORK, NY 266,230266.2k $16.9m $16.9m 0.24% —
43 UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.01% of their portfolio NEW YORK, NY 242,426242.4k $15.4m $15.4m 0.01% —
44 Vontobel Holding Ltd. 0.18% of their portfolio ZURICH, V8 238,537238.5k $15.6m $15.6m 0.18% —
45 BRUNI J V & CO /CO 2.37% of their portfolio COLORADO SPRINGS, CO 238,238238.2k $15.1m $15.1m 2.37% —
46 Bragg Financial Advisors, Inc 1.01% of their portfolio CHARLOTTE, NC 231,599231.6k $14.7m $14.7m 1.01% —
47 Lombard Odier Asset Management (Europe) Ltd 0.74% of their portfolio LONDON, X0 225,549225.5k $14.3m $14.3m 0.74% —
48 PRINCIPAL FINANCIAL GROUP INC 0.01% of their portfolio DES MOINES, IA 223,038223.0k $14.2m $14.2m 0.01% —
49 GLENMEDE TRUST CO NA 0.08% of their portfolio PHILADELPHIA, PA 200,595200.6k $12.7m $12.7m 0.08% —
50 Nuveen Asset Management, LLC 0.01% of their portfolio CHICAGO, IL 200,272200.3k $12.7m $12.7m 0.01% —
51 Verition Fund Management LLC 0.09% of their portfolio GREENWICH, CT 198,800198.8k $12.6m $12.6m 0.09% —
52 CITADEL ADVISORS LLC 0.02% of their portfolio MIAMI, FL 198,599198.6k $12.6m $12.6m 0.02% —
53 Daiwa Securities Group Inc. 0.10% of their portfolio CHIYODA-KU,TOKYO, M0 192,000192.0k $12.2m $12.2m 0.10% —
54 AGF INVESTMENTS INC. 0.11% of their portfolio TORONTO, A6 183,000183.0k $11.6m $11.6m 0.11% —
55 TRUIST FINANCIAL CORP 0.02% of their portfolio CHARLOTTE, NC 182,667182.7k $11.6m $11.6m 0.02% —
56 Handelsinvest Investeringsforvaltning 1.79% of their portfolio HERNING, G7 179,500179.5k $11.4m $11.4m 1.79% —
57 KIRR MARBACH & CO LLC /IN/ 3.83% of their portfolio COLUMBUS, IN 178,078178.1k $11.3m $11.3m 3.83% —
58 RHUMBLINE ADVISERS 0.02% of their portfolio BOSTON, MA 175,520175.5k $11.1m $11.1m 0.02% —
59 Retirement Systems of Alabama 0.05% of their portfolio MONTGOMERY, AL 167,916167.9k $10.7m $10.7m 0.05% —
60 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 140,959141.0k $9.0m $9.0m 0.00% —
61 California Public Employees Retirement System 0.01% of their portfolio Sacramento, CA 138,177138.2k $8.8m $8.8m 0.01% —
62 Swiss National Bank 0.01% of their portfolio ZURICH, V8 135,100135.1k $8.6m $8.6m 0.01% —
63 MUHLENKAMP & CO INC 3.64% of their portfolio WEXFORD, PA 128,341128.3k $8.2m $8.2m 3.64% —
64 ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio NASHVILLE, TN 125,190125.2k $8.0m $8.0m 0.00% —
65 SEI INVESTMENTS CO 0.02% of their portfolio OAKS, PA 124,421124.4k $7.9m $7.9m 0.02% —
66 AQR CAPITAL MANAGEMENT LLC 0.02% of their portfolio Greenwich, CT 117,537117.5k $7.5m $7.5m 0.02% —
67 CapWealth Advisors, LLC 0.95% of their portfolio FRANKLIN, TN 112,782112.8k $7.2m $7.2m 0.95% —
68 COMMUNITY TRUST & INVESTMENT CO 0.67% of their portfolio LEXINGTON, KY 111,160111.2k $7.1m $7.1m 0.67% —
69 Carmignac Gestion 0.14% of their portfolio PARIS, I0 105,243105.2k $6.7m $6.7m 0.14% —
70 STATE OF WISCONSIN INVESTMENT BOARD 0.02% of their portfolio MADISON, WI 105,148105.1k $6.7m $6.7m 0.02% —
71 Rockefeller Capital Management L.P. 0.03% of their portfolio NEW YORK, NY 93,86493.9k $6.0m $6.0m 0.03% —
72 Pier Capital, LLC 1.02% of their portfolio STAMFORD, CT 93,42393.4k $5.9m $5.9m 1.02% —
73 AMERICAN INTERNATIONAL GROUP, INC. 0.04% of their portfolio New York, NY 90,20390.2k $5.7m $5.7m 0.04% —
74 AMERICAN CENTURY COMPANIES INC 0.00% of their portfolio KANSAS CITY, MO 88,38388.4k $5.6m $5.6m 0.00% —
75 Man Group plc 0.03% of their portfolio LONDON, X0 86,93186.9k $5.5m $5.5m 0.03% —
76 Zurcher Kantonalbank (Zurich Cantonalbank) 0.03% of their portfolio ZURICH, V8 86,75086.8k $5.5m $5.5m 0.03% —
77 Cubist Systematic Strategies, LLC 0.04% of their portfolio STAMFORD, CT 86,27086.3k $5.5m $5.5m 0.04% —
78 NEW YORK STATE COMMON RETIREMENT FUND 0.01% of their portfolio ALBANY, NY 85,66385.7k $5.4m $5.4m 0.01% —
79 Legal & General Group Plc 0.00% of their portfolio London, X0 83,49983.5k $5.3m $5.3m 0.00% —
80 RAYMOND JAMES & ASSOCIATES 0.01% of their portfolio ST PETERSBURG, FL 81,24881.2k $5.2m $5.2m 0.01% —
81 CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio WEST SACRAMENTO, CA 73,04273.0k $4.6m $4.6m 0.01% —
82 First Washington CORP 2.34% of their portfolio SEATTLE, WA 73,03473.0k $4.6m $4.6m 2.34% —
83 Smith, Graham & Co., Investment Advisors, LP 0.61% of their portfolio Houston, TX 72,67272.7k $4.6m $4.6m 0.61% —
84 Lighthouse Investment Partners, LLC 1.85% of their portfolio Palm Beach Gardens, FL 72,50372.5k $4.6m $4.6m 1.85% —
85 UBS Group AG 0.00% of their portfolio ZURICH, V8 70,67170.7k $4.5m $4.5m 0.00% —
86 Lombard Odier Asset Management (Switzerland) SA 0.36% of their portfolio PETIT-LANCY, V8 67,57367.6k $4.3m $4.3m 0.36% —
87 WILBANKS SMITH & THOMAS ASSET MANAGEMENT LLC 0.16% of their portfolio NORFOLK, VA 58,92158.9k $3.7m $3.7m 0.16% —
88 LGT Group Foundation 0.14% of their portfolio VADUZ, N2 58,04558.0k $3.7m $3.7m 0.14% —
89 South Dakota Investment Council 0.09% of their portfolio SIOUX FALLS, SD 57,77057.8k $3.7m $3.7m 0.09% —
90 FIRST NATIONAL BANK OF OMAHA 0.24% of their portfolio OMAHA, NE 57,58057.6k $3.7m $3.7m 0.24% —
91 Asset Management One Co., Ltd. 0.02% of their portfolio TOKYO, M0 55,88455.9k $3.5m $3.5m 0.02% —
92 Bellecapital International Ltd. 1.07% of their portfolio ZURICH, V8 55,41355.4k $3.5m $3.5m 1.07% —
93 DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main 0.01% of their portfolio FRANKFURT AM MAIN, 2M 53,68653.7k $3.4m $3.4m 0.01% —
94 MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio Toronto, A6 53,49653.5k $3.4m $3.4m 0.00% —
95 DEUTSCHE BANK AG\ 0.00% of their portfolio FRANKFURT AM MAIN, 2M 52,06652.1k $3.3m $3.3m 0.00% —
96 US BANCORP \DE\ 0.01% of their portfolio MINNEAPOLIS, MN 52,02652.0k $3.3m $3.3m 0.01% —
97 Mariner, LLC 0.01% of their portfolio Overland Park, KS 50,71850.7k $3.2m $3.2m 0.01% —
98 Yaupon Capital Management LP 1.07% of their portfolio NEW YORK, NY 50,34150.3k $3.2m $3.2m 1.07% —
99 Profit Investment Management, LLC 2.41% of their portfolio NORTH BETHESDA, MD 49,50849.5k $3.1m $3.1m 2.41% —
100 UNITED CAPITAL FINANCIAL ADVISORS, LLC 0.02% of their portfolio IRVING, TX 48,82048.8k $3.1m $3.1m 0.02% —