MasTec, Inc.
US ˙ NYSE ˙ US5763231090

SecurityMTZ / MasTec, Inc.
InstitutionAdvisor Group Holdings, Inc.
Latest Disclosed Ownership31,075 shares
Latest Disclosed Value $ 9,997,692
Advisor Group Holdings, Inc. reports 62.63% increase in ownership of MTZ / MasTec, Inc.

On May 15, 2026 - Advisor Group Holdings, Inc. filed a 13F-HR form disclosing ownership of 31,075 shares of MasTec, Inc. (US:MTZ) valued at $9,998,070 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 19,108 shares of MasTec, Inc.. This represents a change in shares of 62.63% during the quarter. The current value of the position is $11,487,184 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F MASTEC COM 576323109 31,075 11,967 62.63 9,998 140.72 0.0085
2026-02-17 2025-12-31 13F MASTEC COM 576323109 19,108 -10,086 -34.55 4,153 -22.46 0.0061
2025-11-14 2025-09-30 13F MASTEC COM 576323109 29,194 -924 -3.07 5,357 4.36 0.0075
2025-09-04 2025-06-30 13F/A-1 ASTEC COM 576323109 30,118 12,567 71.60 5,132 150.59 0.0091
2025-08-13 2025-06-30 13F ASTEC COM 576323109 11,484 -6,067 1,571 0.0018
2025-05-12 2025-03-31 13F MASTEC COM 576323109 17,551 5,669 47.71 2,048 28.16 0.0046
2025-06-06 2024-12-31 13F/A-1 MASTEC COM 576323109 11,882 -4,603 -27.92 1,599 -21.24 0.0036
2025-02-07 2024-12-31 13F MASTEC COM 576323109 14,851 -1,634 1,818 0.0046
2024-11-13 2024-09-30 13F MASTEC COM 576323109 16,485 7,172 77.01 2,029 103.71 0.0046
2024-08-13 2024-06-30 13F MASTEC COM 576323109 9,313 -849 -8.35 996 5.17 0.0024
2024-05-10 2024-03-31 13F MASTEC COM 576323109 10,162 3,997 64.83 948 103.22 0.0021
2024-02-12 2023-12-31 13F MASTEC COM 576323109 6,165 -3,253 -34.54 467 -31.17 0.0008
2023-11-13 2023-09-30 13F MASTEC COM 576323109 9,418 -8,413 -47.18 678 -67.76 0.0010
2023-08-21 2023-06-30 13F/A-1 MASTEC COM 576323109 17,831 8,554 92.21 2,100 140.27 0.0038
2023-08-10 2023-06-30 13F MASTEC COM 576323109 17,831 8,554 2,100 0.0006
2023-05-12 2023-03-31 13F MASTEC COM 576323109 9,277 263 2.92 874 13.65 0.0016
2023-02-10 2022-12-31 13F MASTEC COM 576323109 9,014 -410 -4.35 770 28.60 0.0016
2022-11-14 2022-09-30 13F MASTEC COM 576323109 9,424 -1,491 -13.66 598 -23.63 0.0014
2022-08-10 2022-06-30 13F MASTEC COM 576323109 10,915 -654 -5.65 783 -44.11 0.0017
2022-05-04 2022-03-31 13F MASTEC COM 576323109 11,569 -1,768 -13.26 1,401 13.72 0.0027
2022-02-03 2021-12-31 13F MASTEC COM 576323109 13,337 -407 -2.96 1,232 3.79 0.0023
2021-11-05 2021-09-30 13F MASTEC COM 576323109 13,744 26 0.19 1,187 -18.31 0.0025
2021-08-02 2021-06-30 13F MASTEC COM 576323109 13,718 738 5.69 1,453 19.29 0.0031
2021-05-13 2021-03-31 13F MASTEC COM 576323109 12,980 1,101 9.27 1,218 50.74 0.0029
2021-02-10 2020-12-31 13F MASTEC COM 576323109 11,879 -3,270 -21.59 808 25.27 0.0022
2020-11-12 2020-09-30 13F MASTEC COM 576323109 15,149 -1,197 -7.32 645 -12.01 0.0019
2020-08-14 2020-06-30 13F MASTEC COM 576323109 16,346 5,723 53.87 733 110.63 0.0025
2020-05-18 2020-03-31 13F MASTEC COM 576323109 10,623 10,623 348 0.0014
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.