MasTec, Inc.
US ˙ NYSE ˙ US5763231090

SecurityMTZ / MasTec, Inc.
InstitutionFox Run Management, L.l.c.
Latest Disclosed Ownership3,110 shares
Latest Disclosed Value $ 951,038
Fox Run Management, L.l.c. reports 237.68% increase in ownership of MTZ / MasTec, Inc.

On May 12, 2026 - Fox Run Management, L.l.c. filed a 13F-HR form disclosing ownership of 3,110 shares of MasTec, Inc. (US:MTZ) valued at $1,000,611 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 921 shares of MasTec, Inc.. This represents a change in shares of 237.68% during the quarter. The current value of the position is $1,149,643 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)
2026-05-12 2026-03-31 13F MASTEC COM 576323109 3,110 2,189 237.68 951 375.50 0.1664
2026-02-11 2025-12-31 13F MASTEC COM 576323109 921 921 200 0.0309
2025-11-12 2025-09-30 13F MASTEC COM 576323109 0 -3,020 -100.00 0 -100.00
2025-08-06 2025-06-30 13F MASTEC COM 576323109 3,020 3,020 515 0.0858
2024-08-13 2024-06-30 13F MASTEC COM 576323109 0 -10,976 -100.00 0 -100.00
2024-05-13 2024-03-31 13F MASTEC COM 576323109 10,976 10,976 1,024 0.2207
2024-02-13 2023-12-31 13F MASTEC COM 576323109 0 -4,435 -100.00 0 -100.00
2023-11-07 2023-09-30 13F MASTEC COM 576323109 4,435 4,435 319 0.0945
2022-11-07 2022-09-30 13F MASTEC COM 576323109 0 -2,936 -100.00 0 -100.00
2022-08-12 2022-06-30 13F MASTEC COM 576323109 2,936 2,936 210 0.1048
2022-05-10 2022-03-31 13F MASTEC COM 576323109 0 -3,852 -100.00 0 -100.00
2022-02-09 2021-12-31 13F MASTEC COM 576323109 3,852 -888 -18.73 355 -13.20 0.2092
2021-11-15 2021-09-30 13F MASTEC COM 576323109 4,740 1,758 58.95 409 29.43 0.2576
2021-08-05 2021-06-30 13F MASTEC COM 576323109 2,982 2,982 316 0.2874
2018-04-17 2018-03-31 13F MASTEC COM 576323109 0 -23,051 -100.00 0 -100.00
2018-01-18 2017-12-31 13F MASTEC COM 576323109 23,051 11,451 98.72 1,128 109.67 0.3303
2017-10-23 2017-09-30 13F MASTEC COM 576323109 11,600 1,000 9.43 538 12.32 0.1524
2017-07-10 2017-06-30 13F MASTEC COM 576323109 10,600 -2,600 -19.70 479 -9.45 0.1656
2017-04-17 2017-03-31 13F MASTEC COM 576323109 13,200 13,200 529 0.2158
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.