MasTec, Inc.
US ˙ NYSE ˙ US5763231090

SecurityMTZ / MasTec, Inc.
InstitutionMuhlenkamp & Co Inc
Latest Disclosed Ownership42,832 shares
Latest Disclosed Value $ 13,780,768
Muhlenkamp & Co Inc reports 59.50% decrease in ownership of MTZ / MasTec, Inc.

On May 6, 2026 - Muhlenkamp & Co Inc filed a 13F-HR form disclosing ownership of 42,832 shares of MasTec, Inc. (US:MTZ) valued at $13,780,768 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 4, 2026 disclosing 105,760 shares of MasTec, Inc.. This represents a change in shares of -59.50% during the quarter. The current value of the position is $16,050,435 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)
2026-05-06 2026-03-31 13F MASTEC COM 576323109 42,832 -62,928 -59.50 13,781 -40.06 3.6285
2026-02-04 2025-12-31 13F MASTEC COM 576323109 105,760 -26 -0.02 22,989 2.12 6.1828
2025-11-07 2025-09-30 13F MASTEC COM 576323109 105,786 -298 -0.28 22,512 24.52 6.1192
2025-07-24 2025-06-30 13F MASTEC COM 576323109 106,084 625 0.59 18,080 46.89 5.6414
2025-05-13 2025-03-31 13F MASTEC COM 576323109 105,459 -45 -0.04 12,308 -14.31 4.0269
2025-02-13 2024-12-31 13F MASTEC COM 576323109 105,504 233 0.22 14,363 10.84 4.3595
2024-11-12 2024-09-30 13F MASTEC COM 576323109 105,271 24 0.02 12,959 15.08 3.9710
2024-07-17 2024-06-30 13F MASTEC COM 576323109 105,247 -27,743 -20.86 11,260 -9.20 3.5141
2024-04-23 2024-03-31 13F MASTEC COM 576323109 132,990 1,981 1.51 12,401 25.01 3.6021
2024-01-08 2023-12-31 13F MASTEC COM 576323109 131,009 1,332 1.03 9,920 6.30 3.2449
2023-12-06 2023-09-30 13F MASTEC COM 576323109 129,677 1,858 1.45 9,333 -38.11 3.2210
2023-07-14 2023-06-30 13F MASTEC COM 576323109 127,819 -398 -0.31 15,079 37.82 5.3435
2023-01-31 2022-12-31 13F MASTEC COM 576323109 128,217 -124 -0.10 10,941 34.23 4.6351
2022-11-01 2022-09-30 13F MASTEC COM 576323109 128,341 446 0.35 8,150 -11.07 3.6390
2022-07-18 2022-06-30 13F MASTEC COM 576323109 127,895 -1,164 -0.90 9,165 -18.47 4.2917
2022-04-01 2022-03-31 13F MASTEC COM 576323109 129,059 520 0.40 11,241 -5.24 3.9147
2022-03-29 2021-12-31 13F MASTEC COM 576323109 128,539 -95 -0.07 11,862 6.87 4.1340
2021-12-10 2021-09-30 13F MASTEC COM 576323109 128,634 -541 -0.42 11,099 -19.01 4.2616
2021-08-18 2021-06-30 13F MASTEC COM 576323109 129,175 541 0.42 13,705 17.26 5.0274
2021-08-18 2021-03-31 13F MASTEC COM 576323109 128,634 -38,136 -22.87 11,688 2.80 4.3233
2021-02-11 2020-12-31 13F MASTEC COM 576323109 166,770 294 0.18 11,370 61.85 4.5755
2020-11-13 2020-09-30 13F MASTEC COM 576323109 166,476 74,125 80.26 7,025 69.52 3.6378
2020-08-20 2020-06-30 13F MASTEC COM 576323109 92,351 92,351 4,144 2.2164
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.