MasTec, Inc.
US ˙ NYSE ˙ US5763231090

SecurityMTZ / MasTec, Inc.
Institution1832 Asset Management L.P.
Latest Disclosed Ownership61,000 shares
Latest Disclosed Value $ 19,626,140
1832 Asset Management L.P. ownership in MTZ / MasTec, Inc.

On May 14, 2026 - 1832 Asset Management L.P. filed a 13F-HR form disclosing ownership of 61,000 shares of MasTec, Inc. (US:MTZ) valued at $19,626,140 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 0 shares of MasTec, Inc.. The current value of the position is $22,197,290 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)
2026-05-14 2026-03-31 13F MASTEC COM 576323109 61,000 61,000 19,626 0.0180
2026-02-13 2025-12-31 13F MASTEC COM 576323109 0 -94,500 -100.00 0 -100.00
2025-11-14 2025-09-30 13F MASTEC COM 576323109 94,500 94,500 20,111 0.0159
2023-08-14 2023-06-30 13F MASTEC COM 576323109 0 -233 -100.00 0 -100.00
2023-05-12 2023-03-31 13F MASTEC COM 576323109 233 233 22 0.0000
2017-05-15 2017-03-31 13F MASTEC COM 576323109 0 -222,700 -100.00 0 -100.00
2017-02-14 2016-12-31 13F MASTEC COM 576323109 222,700 0 0.00 6,470 -2.31 0.0243
2016-11-15 2016-09-30 13F MASTEC COM 576323109 222,700 -88,200 -28.37 6,623 -5.18 0.0249
2016-08-12 2016-06-30 13F/A-1 MASTEC COM 576323109 310,900 -960,317 -75.54 6,985 -83.63 0.0272
2016-08-12 2016-06-30 13F MASTEC COM 576323109 310,900 -769,489 11,660 0.0281
2016-05-12 2016-03-31 13F MASTEC COM 576323109 1,271,217 -265,270 -17.26 42,658 58.36 0.1039
2016-02-12 2015-12-31 13F MASTEC COM 576323109 1,536,487 -241,400 -13.58 26,937 -3.77 0.1164
2015-11-12 2015-09-30 13F MASTEC COM 576323109 1,777,887 421,935 31.12 27,993 4.02 0.1171
2015-08-13 2015-06-30 13F MASTEC COM 576323109 1,355,952 37,014 2.81 26,911 5.56 0.0913
2015-05-13 2015-03-31 13F MASTEC COM 576323109 1,318,938 45,826 3.60 25,494 -11.34 0.0959
2015-02-12 2014-12-31 13F MASTEC COM 576323109 1,273,112 192,723 17.84 28,756 -13.16 0.0891
2014-11-12 2014-09-30 13F MASTEC COM 576323109 1,080,389 1,016,356 1,587.24 33,112 1,576.56 0.1081
2014-08-13 2014-06-30 13F MASTEC COM 576323109 64,033 64,033 1,975 0.0062
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.