MasTec, Inc.
US ˙ NYSE ˙ US5763231090

SecurityMTZ / MasTec, Inc.
InstitutionAmalgamated Bank
Latest Disclosed Ownership29,476 shares
Latest Disclosed Value $ 9,484
Amalgamated Bank reports 3.10% increase in ownership of MTZ / MasTec, Inc.

On May 8, 2026 - Amalgamated Bank filed a 13F-HR form disclosing ownership of 29,476 shares of MasTec, Inc. (US:MTZ) valued at $9,483,608 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 28,590 shares of MasTec, Inc.. This represents a change in shares of 3.10% during the quarter. The current value of the position is $10,896,098 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)
2026-05-08 2026-03-31 13F MASTEC COM 576323109 29,476 886 3.10 9 50.00 0.0726
2026-02-05 2025-12-31 13F MASTEC COM 576323109 28,590 -192 -0.67 6 0.00 0.0449
2025-10-29 2025-09-30 13F MASTEC COM 576323109 28,782 63 0.22 6 50.00 0.0438
2025-08-04 2025-06-30 13F MASTEC COM 576323109 28,719 435 1.54 5 33.33 0.0378
2025-04-25 2025-03-31 13F MASTEC COM 576323109 28,284 -1,093 -3.72 3 0.00 0.0282
2025-02-04 2024-12-31 13F MASTEC COM 576323109 29,377 296 1.02 4 0.00 0.0328
2024-10-30 2024-09-30 13F MASTEC COM 576323109 29,081 -8,690 -23.01 4 -25.00 0.0295
2024-08-12 2024-06-30 13F MASTEC COM 576323109 37,771 1,030 2.80 4 33.33 0.0344
2024-04-23 2024-03-31 13F MASTEC COM 576323109 36,741 -1,388 -3.64 3 50.00 0.0293
2024-02-06 2023-12-31 13F MASTEC COM 576323109 38,129 -3,564 -8.55 3 -33.33 0.0230
2023-11-08 2023-09-30 13F MASTEC COM 576323109 41,693 2,464 6.28 3 -25.00 0.0256
2023-08-11 2023-06-30 13F MASTEC COM 576323109 39,229 -1,779 -4.34 5 33.33 0.0375
2023-05-02 2023-03-31 13F MASTEC COM 576323109 41,008 -11,025 -21.19 4 -25.00 0.0330
2023-02-10 2022-12-31 13F MASTEC COM 576323109 52,033 10,623 25.65 4 -99.85 0.0396
2022-11-09 2022-09-30 13F MASTEC COM 576323109 41,410 -91 -0.22 2,630 -11.57 0.0254
2022-08-15 2022-06-30 13F MASTEC COM 576323109 41,501 1,104 2.73 2,974 -15.49 0.0277
2022-08-25 2022-03-31 13F/A-1 MASTEC COM 576323109 40,397 -418 -1.02 3,519 -6.56 0.0273
2022-06-30 2022-03-31 13F MASTEC COM 576323109 40,397 -418 3,519 0.0279
2022-02-15 2021-12-31 13F/A-1 MASTEC COM 576323109 40,815 -8,279 -16.86 3,766 -11.10 0.0278
2022-02-15 2021-12-31 13F MASTEC COM 576323109 40,815 -8,279 3,766 0.0278
2021-10-29 2021-09-30 13F MASTEC COM 576323109 49,094 -3,727 -7.06 4,236 -24.41 0.0358
2021-08-16 2021-06-30 13F MASTEC COM 576323109 52,821 47,526 897.56 5,604 1,029.84 0.0449
2021-05-13 2021-03-31 13F MASTEC COM 576323109 5,295 -372 -6.56 496 28.50 0.0186
2021-02-12 2020-12-31 13F MASTEC COM 576323109 5,667 38 0.68 386 62.18 0.0146
2020-10-30 2020-09-30 13F MASTEC COM 576323109 5,629 -63 -1.11 238 -6.67 0.0103
2020-08-10 2020-06-30 13F MASTEC COM 576323109 5,692 -5,565 -49.44 255 -30.71 0.0118
2020-05-13 2020-03-31 13F MASTEC COM 576323109 11,257 -338 -2.92 368 -50.54 0.0090
2020-02-13 2019-12-31 13F MASTEC COM 576323109 11,595 408 3.65 744 2.48 0.0137
2019-11-13 2019-09-30 13F MASTEC COM 576323109 11,187 -172 -1.51 726 24.10 0.0153
2019-08-14 2019-06-30 13F MASTEC COM 576323109 11,359 1,039 10.07 585 17.94 0.0137
2019-05-15 2019-03-31 13F MASTEC COM 576323109 10,320 329 3.29 496 22.47 0.0120
2019-02-15 2018-12-31 13F MASTEC COM 576323109 9,991 9,991 405 0.0115
2018-11-14 2018-09-30 13F MASTEC COM 576323109 0 -9,926 -100.00 0 -100.00
2018-07-18 2018-06-30 13F MASTEC COM 576323109 9,926 1,024 11.50 504 20.29 0.0123
2018-05-22 2018-03-31 13F MASTEC COM 576323109 8,902 -155 -1.71 419 -5.42 0.0111
2018-02-13 2017-12-31 13F MASTEC COM 576323109 9,057 586 6.92 443 12.72 0.0120
2017-11-09 2017-09-30 13F MASTEC COM 576323109 8,471 -93 -1.09 393 1.55 0.0122
2017-08-10 2017-06-30 13F MASTEC COM 576323109 8,564 447 5.51 387 19.08 0.0127
2017-05-12 2017-03-31 13F MASTEC COM 576323109 8,117 -20 -0.25 325 4.50 0.0162
2017-02-14 2016-12-31 13F MASTEC COM 576323109 8,137 1,132 16.16 311 49.52 0.0141
2016-11-15 2016-09-30 13F/A-1 MASTEC COM 576323109 7,005 8 0.11 208 -0.48 0.0121
2016-08-16 2016-06-30 13F MASTEC COM 576323109 6,997 893 14.63 209 -21.13 0.0121
2014-05-12 2014-03-31 13F MASTEC INC COM 576323109 6,104 -55 -0.89 265 31.19 0.0457
2014-02-13 2013-12-31 13F MASTEC INC COM 576323109 6,159 6,159 202 0.0343
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.