MasTec, Inc.
US ˙ NYSE ˙ US5763231090

SecurityMTZ / MasTec, Inc.
InstitutionQuantbot Technologies LP
Latest Disclosed Ownership3,953 shares
Latest Disclosed Value $ 1,271,838
Quantbot Technologies LP reports 35.93% decrease in ownership of MTZ / MasTec, Inc.

On May 13, 2026 - Quantbot Technologies LP filed a 13F-HR form disclosing ownership of 3,953 shares of MasTec, Inc. (US:MTZ) valued at $1,271,838 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 6,170 shares of MasTec, Inc.. This represents a change in shares of -35.93% during the quarter. The current value of the position is $1,461,266 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)
2026-05-13 2026-03-31 13F MASTEC COM 576323109 3,953 -2,217 -35.93 1,272 -5.22 0.0520
2026-02-10 2025-12-31 13F MASTEC COM 576323109 6,170 1,653 36.60 1,341 39.54 0.0446
2025-11-12 2025-09-30 13F MASTEC COM 576323109 4,517 -24,951 -84.67 961 -80.86 0.0262
2025-08-13 2025-06-30 13F MASTEC COM 576323109 29,468 29,468 5,022 0.1288
2025-05-13 2025-03-31 13F MASTEC COM 576323109 0 -9,125 -100.00 0 -100.00
2025-02-11 2024-12-31 13F MASTEC COM 576323109 9,125 5,831 177.02 1,242 206.67 0.0454
2024-11-13 2024-09-30 13F MASTEC COM 576323109 3,294 3,294 405 0.0160
2024-05-06 2024-03-31 13F MASTEC COM 576323109 0 -520 -100.00 0 -100.00
2024-02-14 2023-12-31 13F MASTEC COM 576323109 520 -43,690 -98.82 39 -98.77 0.0023
2023-11-07 2023-09-30 13F MASTEC COM 576323109 44,210 44,210 3,182 0.2138
2021-08-12 2021-06-30 13F MASTEC COM 576323109 0 -863 -100.00 0 -100.00
2021-05-14 2021-03-31 13F MASTEC COM 576323109 863 863 80 0.0076
2020-08-13 2020-06-30 13F MASTEC COM 576323109 0 -5,609 -100.00 0 -100.00
2020-05-13 2020-03-31 13F MASTEC COM 576323109 5,609 3,471 162.35 183 33.58 0.1193
2020-02-10 2019-12-31 13F MASTEC COM 576323109 2,138 2,138 137 0.0136
2018-05-11 2018-03-31 13F MASTEC COM 576323109 0 -23,314 -100.00 0 -100.00
2018-02-12 2017-12-31 13F MASTEC COM 576323109 23,314 23,314 1,141 0.1057
2017-02-09 2016-12-31 13F MASTEC COM 576323109 0 -1,573 -100.00 0 -100.00
2016-10-31 2016-09-30 13F MASTEC COM 576323109 1,573 1,573 0.00 46 0.0051
2016-08-02 2016-06-30 13F MASTEC COM 576323109 0 -3,415 -100.00 0 -100.00
2016-04-28 2016-03-31 13F MASTEC COM 576323109 3,415 3,415 0.00 69 0.0110
2016-01-22 2015-12-31 13F MASTEC COM 576323109 0 -7,550 -100.00 0 -100.00
2015-10-22 2015-09-30 13F MASTEC COM 576323109 7,550 7,550 0.00 119 0.0207
2015-07-27 2015-06-30 13F MASTEC COM 576323109 0 -4,462 -100.00 0 -100.00
2015-04-24 2015-03-31 13F MASTEC COM 576323109 4,462 4,462 0.00 86 0.0213
2014-10-15 2014-09-30 13F MASTEC COM 576323109 0 -50,014 -100.00 0 -100.00
2014-07-08 2014-06-30 13F MASTEC COM 576323109 50,014 46,714 1,415.58 1,541 977.62 0.2436
2014-05-21 2014-03-31 13F MASTEC COM 576323109 3,300 -1,200 -26.67 143 -2.72 0.0337
2014-01-31 2013-12-31 13F MASTEC COM 576323109 4,500 1,800 66.67 147 81.48 0.0719
2013-10-28 2013-09-30 13F MASTEC COM 576323109 2,700 2,700 81 0.0502
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.