MasTec, Inc.
US ˙ NYSE ˙ US5763231090

SecurityMTZ / MasTec, Inc.
InstitutionAssetmark, Inc
Latest Disclosed Ownership597 shares
Latest Disclosed Value $ 192,079
Assetmark, Inc reports 38.52% increase in ownership of MTZ / MasTec, Inc.

On May 6, 2026 - Assetmark, Inc filed a 13F-HR form disclosing ownership of 597 shares of MasTec, Inc. (US:MTZ) valued at $192,079 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 431 shares of MasTec, Inc.. This represents a change in shares of 38.52% during the quarter. The current value of the position is $223,714 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 597 166 38.52 192 106.45 0.0004
2026-01-23 2025-12-31 13F MASTEC COM 576323109 431 402 1,386.21 94 1,450.00 0.0002
2025-11-06 2025-09-30 13F MASTEC COM 576323109 29 10 52.63 6 100.00 0.0000
2025-08-04 2025-06-30 13F MASTEC COM 576323109 19 17 850.00 3 0.0000
2025-05-06 2025-03-31 13F MASTEC COM 576323109 2 -1 -33.33 0 0.0000
2025-02-06 2024-12-31 13F MASTEC COM 576323109 3 3 0 0.0000
2024-05-07 2024-03-31 13F MASTEC COM 576323109 0 -3 -100.00 0 0.0000
2024-02-09 2023-12-31 13F MASTEC COM 576323109 3 3 0 0.0000
2022-08-03 2022-06-30 13F MASTEC INC COM COM 576323109 0 -17 -100.00 0 -100.00
2022-05-13 2022-03-31 13F MASTEC INC COM COM 576323109 17 -15,122 -99.89 1 -99.93 0.0000
2022-02-14 2021-12-31 13F MASTEC INC COM COM 576323109 15,139 -224 -1.46 1,397 5.35 0.0057
2021-11-12 2021-09-30 13F MASTEC INC COM COM 576323109 15,363 1,315 9.36 1,326 -11.01 0.0059
2021-08-16 2021-06-30 13F MASTEC INC COM COM 576323109 14,048 1,423 11.27 1,490 25.95 0.0069
2021-05-14 2021-03-31 13F MASTEC COM 576323109 12,625 1,870 17.39 1,183 61.39 0.0061
2021-02-10 2020-12-31 13F MASTEC INC COM COM 576323109 10,755 502 4.90 733 69.28 0.0041
2020-11-13 2020-09-30 13F MASTEC INC COM COM 576323109 10,253 4,539 79.44 433 69.14 0.0028
2020-08-11 2020-06-30 13F MASTEC INC COM COM 576323109 5,714 5,484 2,384.35 256 3,100.00 0.0018
2020-05-12 2020-03-31 13F MASTEC INC COM COM 576323109 230 -34 -12.88 8 -52.94 0.0001
2020-02-11 2019-12-31 13F MASTEC INC COM COM 576323109 264 225 576.92 17 466.67 0.0001
2019-11-13 2019-09-30 13F MASTEC INC COM COM 576323109 39 39 3 0.0000
2019-05-14 2019-03-31 13F MASTEC INC COM COM 576323109 0 -18 -100.00 0 -100.00
2019-02-13 2018-12-31 13F MASTEC INC COM COM 576323109 18 18 1 0.0000
2017-11-08 2017-09-30 13F MASTEC INC COM COM 576323109 0 -32 -100.00 0 -100.00
2017-08-14 2017-06-30 13F MASTEC INC COM COM 576323109 32 32 1 0.0000
2017-09-14 2016-06-30 13F/A-1 MASTEC INC COM COM 576323109 0 -9 -100.00 0 0.0000
2017-09-14 2016-03-31 13F/A-1 MASTEC INC COM COM 576323109 9 0 0.00 0 0.0000
2016-05-13 2016-03-31 13F MASTEC INC COM COM 576323109 9 0 0
2017-09-14 2015-12-31 13F/A-1 MASTEC INC COM COM 576323109 9 -5 -35.71 0 0.0000
2016-02-12 2015-12-31 13F MASTEC INC COM COM 576323109 9 -5 0
2016-01-05 2015-09-30 13F/A-1 MASTEC INC COM COM 576323109 14 -44,954 -99.97 0 -100.00
2015-11-10 2015-09-30 13F MASTEC INC COM COM 576323109 14 0
2015-08-13 2015-06-30 13F MASTEC INC COM COM 576323109 44,968 2,720 6.44 894 9.69 0.0186
2015-05-12 2015-03-31 13F MASTEC INC COM COM 576323109 42,248 42,248 0.00 815 0.0174
2015-02-03 2014-12-31 13F MASTEC INC COM COM 576323109 0 -37,625 -100.00 0 -100.00
2014-11-10 2014-09-30 13F MASTEC INC COM COM 576323109 37,625 184 0.49 1,152 -0.17 0.0266
2014-08-12 2014-06-30 13F MASTEC INC COM COM 576323109 37,441 13,941 59.32 1,154 13.03 0.0246
2014-05-06 2014-03-31 13F MASTEC INC COM COM 576323109 23,500 130 0.56 1,021 33.46 0.0249
2014-02-11 2013-12-31 13F MASTEC INC COM COM 576323109 23,370 430 1.87 765 10.07 0.0181
2014-02-11 2013-09-30 13F/A-1 MASTEC INC COM COM 576323109 22,940 22,940 695 0.0176
2013-11-14 2013-09-30 13F MASTEC INC COM COM 576323109 22,940 695 0.0176
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.