MasTec, Inc.
US ˙ NYSE ˙ US5763231090

SecurityMTZ / MasTec, Inc.
InstitutionCwm, Llc
Latest Disclosed Ownership38,107 shares
Latest Disclosed Value $ 12,260,546
Cwm, Llc reports 24.51% increase in ownership of MTZ / MasTec, Inc.

On May 14, 2026 - Cwm, Llc filed a 13F-HR form disclosing ownership of 38,107 shares of MasTec, Inc. (US:MTZ) valued at $12,260,546 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 30,605 shares of MasTec, Inc.. This represents a change in shares of 24.51% during the quarter. The current value of the position is $14,086,634 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 38,107 7,502 24.51 12,261 204,233.33 0.0319
2026-01-26 2025-12-31 13F MASTEC COM 576323109 30,605 561 1.87 7 0.00 0.0180
2025-10-15 2025-09-30 13F MASTEC COM 576323109 30,044 10,835 56.41 6 100.00 0.0192
2025-07-25 2025-06-30 13F MASTEC COM 576323109 19,209 1,678 9.57 3 50.00 0.0115
2025-05-01 2025-03-31 13F MASTEC COM 576323109 17,531 19 0.11 2 0.00 0.0082
2025-02-04 2024-12-31 13F MASTEC COM 576323109 17,512 4,179 31.34 2 100.00 0.0099
2024-10-08 2024-09-30 13F MASTEC COM 576323109 13,333 9,239 225.67 2 0.0071
2024-07-10 2024-06-30 13F MASTEC COM 576323109 4,094 3,405 494.19 0 0.0021
2024-04-05 2024-03-31 13F MASTEC COM 576323109 689 -148 -17.68 0 0.0003
2024-02-01 2023-12-31 13F MASTEC COM 576323109 837 312 59.43 0 0.0003
2023-10-11 2023-09-30 13F MASTEC COM 576323109 525 317 152.40 0 0.0002
2023-08-03 2023-06-30 13F MASTEC COM 576323109 208 -32 -13.33 0 0.0002
2023-05-01 2023-03-31 13F MASTEC COM 576323109 240 11 4.80 0 0.0002
2023-02-01 2022-12-31 13F MASTEC COM 576323109 229 -180 -44.01 0 -100.00 0.0001
2022-10-27 2022-09-30 13F MASTEC COM 576323109 409 -75 -15.50 26 -25.71 0.0002
2022-07-28 2022-06-30 13F MASTEC COM 576323109 484 -82 -14.49 35 -28.57 0.0003
2022-04-21 2022-03-31 13F MASTEC COM 576323109 566 -34 -5.67 49 -10.91 0.0003
2022-01-31 2021-12-31 13F MASTEC COM 576323109 600 136 29.31 55 12.24 0.0004
2021-09-15 2021-06-30 13F/A-1 MASTEC COM 576323109 464 0 0.00 49 0.00 0.0004
2021-07-29 2021-06-30 13F MASTEC COM 576323109 464 0 49 0.0004
2021-09-15 2021-03-31 13F/A-1 MASTEC COM 576323109 464 0 0.00 49 0.00 0.0004
2021-04-27 2021-03-31 13F MASTEC COM 576323109 464 0 43 0.0004
2021-09-15 2020-12-31 13F/A-1 MASTEC COM 576323109 464 0 0.00 49 0.00 0.0004
2021-01-27 2020-12-31 13F MASTEC COM 576323109 252 -212 17 0.0002
2021-09-15 2020-09-30 13F/A-1 MASTEC COM 576323109 464 0 0.00 49 0.00 0.0004
2020-10-19 2020-09-30 13F MASTEC COM 576323109 281 -183 12 0.0001
2021-09-15 2020-06-30 13F/A-1 MASTEC COM 576323109 464 0 0.00 49 0.00 0.0004
2020-07-22 2020-06-30 13F MASTEC COM 576323109 252 -212 11 0.0001
2021-09-15 2020-03-31 13F/A-1 MASTEC COM 576323109 464 0 0.00 49 0.00 0.0004
2020-04-28 2020-03-31 13F MASTEC COM 576323109 200 -264 7 0.0001
2021-09-14 2019-12-31 13F/A-1 MASTEC COM 576323109 464 0 0.00 49 0.00 0.0004
2020-01-27 2019-12-31 13F MASTEC COM 576323109 200 -264 13 0.0002
2021-09-14 2019-09-30 13F/A-1 MASTEC COM 576323109 464 0 0.00 49 0.00 0.0004
2019-10-22 2019-09-30 13F MASTEC COM 576323109 238 -226 15 0.0002
2021-09-14 2019-06-30 13F/A-1 MASTEC COM 576323109 464 0 0.00 49 0.00 0.0004
2019-07-31 2019-06-30 13F MASTEC COM 576323109 238 -226 12 0.0002
2021-09-02 2019-03-31 13F/A-1 MASTEC COM 576323109 464 229 97.45 49 390.00 0.0004
2019-04-22 2019-03-31 13F MASTEC COM 576323109 273 38 13 0.0003
2019-01-25 2018-12-31 13F MASTEC COM 576323109 235 35 17.50 10 11.11 0.0002
2018-10-29 2018-09-30 13F MASTEC COM 576323109 200 0 0.00 9 -10.00 0.0002
2018-07-31 2018-06-30 13F MASTEC COM 576323109 200 0 0.00 10 11.11 0.0003
2018-04-26 2018-03-31 13F MASTEC COM 576323109 200 0 0.00 9 -10.00 0.0004
2018-01-16 2017-12-31 13F MASTEC COM 576323109 200 0 0.00 10 11.11 0.0004
2017-10-16 2017-09-30 13F MASTEC COM 576323109 200 0 0.00 9 0.00 0.0004
2017-07-17 2017-06-30 13F MASTEC COM 576323109 200 0 0.00 9 12.50 0.0005
2017-04-17 2017-03-31 13F MASTEC COM 576323109 200 0 0.00 8 0.00 0.0005
2017-01-19 2016-12-31 13F MASTEC COM 576323109 200 0 0.00 8 33.33 0.0005
2016-10-17 2016-09-30 13F MASTEC COM 576323109 200 200 6 0.0004
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.