MasTec, Inc.
US ˙ NYSE ˙ US5763231090

SecurityMTZ / MasTec, Inc.
InstitutionBlackRock, Inc.
Latest Disclosed Ownership5,415,319 shares
Ownership 6.80%
BlackRock, Inc. ownership in MTZ / MasTec, Inc.

2025-04-17 - BlackRock, Inc. has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 5,415,319 shares of MasTec, Inc. (US:MTZ). This represents 6.8 percent ownership of the company. In their previous filing dated 2025-02-05 , BlackRock, Inc. had reported owning 7,293,320 shares, indicating a decrease of -25.75 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2025-04-17 2025-04-17 13G/A 7,293,320 5,415,319 -25.75 6.80 -26.09
2025-02-05 2025-02-05 13G/A 5,425,430 7,293,320 34.43 9.20 33.33
2024-01-26 2024-01-26 13G/A 5,866,074 5,425,430 -7.51 6.90 -8.00
2023-01-31 2023-01-31 13G/A 5,481,959 5,866,074 7.01 7.50 1.35
2022-02-01 2022-02-01 13G/A 7,514,030 5,481,959 -27.04 7.40 -26.73
2021-04-12 2021-04-12 13G/A 7,514,030 7,514,030 0.00 10.10 0.00
2021-04-12 2021-04-12 13G/A 6,906,228 7,514,030 8.80 10.10 7.45
2021-01-29 2021-01-29 13G/A 8,064,018 6,906,228 -14.36 9.40 -11.32
2020-02-04 2020-02-04 13G/A 7,918,452 8,064,018 1.84 10.60 1.92
2019-03-08 2019-03-08 13G/A 7,818,157 7,918,452 1.28 10.40 5.05
2019-02-06 2019-02-06 13G/A 4,824,757 7,818,157 62.04 9.90 70.69
2018-01-25 2018-01-25 13G/A 4,761,995 4,824,757 1.32 5.80 0.00
2017-01-30 2017-01-30 13G 4,761,995 5.80
2013-02-11 2013-02-11 13G/A 3,111,196 4.10
2013-01-30 2013-01-30 13G 3,910,882 5.15

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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)
2026-05-13 2026-03-31 13F MASTEC COM 576323109 7,309,609 198,355 2.79 2,351,794 52.14 0.0411
2026-02-12 2025-12-31 13F MASTEC COM 576323109 7,111,254 -632,111 -8.16 1,545,773 -6.20 0.0261
2025-11-12 2025-09-30 13F MASTEC COM 576323109 7,743,365 -420,802 -5.15 1,647,866 18.43 0.0288
2025-08-12 2025-06-30 13F MASTEC COM 576323109 8,164,167 492,928 6.43 1,391,419 55.41 0.0265
2025-05-02 2025-03-31 13F MASTEC COM 576323109 7,671,239 377,919 5.18 895,310 -9.83 0.0188
2025-02-07 2024-12-31 13F MASTEC COM 576323109 7,293,320 1,248,054 20.65 992,913 33.43 0.0201
2024-11-13 2024-09-30 13F MASTEC COM 576323109 6,045,266 205,582 3.52 744,172 19.11 0.0156
2024-08-13 2024-06-30 13F MASTEC COM 576323109 5,839,684 294,926 5.32 624,788 20.84 0.0141
2024-05-10 2024-03-31 13F MASTEC COM 576323109 5,544,758 119,328 2.20 517,049 25.86 0.0120
2024-02-13 2023-12-31 13F MASTEC COM 576323109 5,425,430 90,787 1.70 410,814 7.00 0.0105
2023-11-13 2023-09-30 13F MASTEC COM 576323109 5,334,643 104,684 2.00 383,934 -37.77 0.0110
2023-08-11 2023-06-30 13F MASTEC COM 576323109 5,229,959 -518,165 -9.01 616,978 13.65 0.0170
2023-05-12 2023-03-31 13F MASTEC COM 576323109 5,748,124 -117,950 -2.01 542,853 8.45 0.0160
2023-02-13 2022-12-31 13F MASTEC COM 576323109 5,866,074 656,721 12.61 500,552 51.32 0.0157
2022-11-14 2022-09-30 13F MASTEC COM 576323109 5,209,353 -148,685 -2.77 330,793 -13.85 0.0113
2022-08-12 2022-06-30 13F MASTEC COM 576323109 5,358,038 -258,122 -4.60 383,957 -21.51 0.0123
2022-05-12 2022-03-31 13F MASTEC COM 576323109 5,616,160 134,201 2.45 489,168 -3.30 0.0132
2022-02-10 2021-12-31 13F MASTEC COM 576323109 5,481,959 265,159 5.08 505,876 12.39 0.0129
2021-11-09 2021-09-30 13F MASTEC COM 576323109 5,216,800 -155,997 -2.90 450,106 -21.04 0.0126
2021-08-11 2021-06-30 13F MASTEC COM 576323109 5,372,797 -2,141,233 -28.50 570,052 -19.03 0.0159
2021-05-07 2021-03-31 13F MASTEC COM 576323109 7,514,030 607,802 8.80 704,066 49.53 0.0207
2021-02-05 2020-12-31 13F MASTEC COM 576323109 6,906,228 -381,715 -5.24 470,868 53.10 0.0150
2020-11-06 2020-09-30 13F MASTEC COM 576323109 7,287,943 -240,226 -3.19 307,553 -8.95 0.0113
2020-08-14 2020-06-30 13F MASTEC COM 576323109 7,528,169 -260,770 -3.35 337,787 32.50 0.0135
2020-05-01 2020-03-31 13F MASTEC COM 576323109 7,788,939 -275,079 -3.41 254,932 -50.73 0.0125
2020-02-13 2019-12-31 13F MASTEC COM 576323109 8,064,018 185,505 2.35 517,387 1.14 0.0198
2019-11-08 2019-09-30 13F MASTEC COM 576323109 7,878,513 -69,023 -0.87 511,551 24.91 0.0215
2019-08-22 2019-06-30 13F/A-1 MASTEC COM 576323109 7,947,536 139,490 1.79 409,536 9.04 0.0175
2019-08-13 2019-06-30 13F MASTEC COM 576323109 7,947,536 139,490 409,536
2019-05-09 2019-03-31 13F MASTEC COM 576323109 7,808,046 -10,111 -0.13 375,568 18.44 0.0168
2019-02-08 2018-12-31 13F MASTEC COM 576323109 7,818,157 2,762,363 54.64 317,103 40.47 0.0160
2018-11-09 2018-09-30 13F MASTEC COM 576323109 5,055,794 260,030 5.42 225,742 -7.25 0.0098
2018-08-09 2018-06-30 13F MASTEC COM 576323109 4,795,764 100,410 2.14 243,385 10.17 0.0112
2018-05-09 2018-03-31 13F MASTEC COM 576323109 4,695,354 -129,403 -2.68 220,917 -6.46 0.0106
2018-02-09 2017-12-31 13F MASTEC COM 576323109 4,824,757 75,133 1.58 236,171 7.16 0.0112
2017-11-14 2017-09-30 13F MASTEC COM 576323109 4,749,624 -224,186 -4.51 220,382 -1.86 0.0111
2017-08-10 2017-06-30 13F MASTEC COM 576323109 4,973,810 -218,528 -4.21 224,568 7.99 0.0119
2017-05-12 2017-03-31 13F MASTEC COM 576323109 5,192,338 5,160,001 15,956.96 207,953 16,711.08 0.0114
2017-02-10 2016-12-31 13F MASTEC COM 576323109 32,337 13,101 68.11 1,237 116.26 0.0018
2016-11-08 2016-09-30 13F MASTEC COM 576323109 19,236 11,292 142.15 572 223.16 0.0008
2016-08-10 2016-06-30 13F MASTEC COM 576323109 7,944 424 5.64 177 15.69 0.0003
2016-05-10 2016-03-31 13F MASTEC COM 576323109 7,520 2,205 41.49 153 64.52 0.0002
2016-02-11 2015-12-31 13F MASTEC COM 576323109 5,315 673 14.50 93 27.40 0.0001
2015-11-13 2015-09-30 13F MASTEC COM 576323109 4,642 -9,721 -67.68 73 -74.48 0.0001
2015-08-07 2015-06-30 13F MASTEC COM 576323109 14,363 -18,880 -56.79 286 -55.38 0.0004
2015-05-13 2015-03-31 13F MASTEC COM 576323109 33,243 6,865 26.03 641 7.55 0.0009
2015-02-09 2014-12-31 13F MASTEC COM 576323109 26,378 -679 -2.51 596 -28.02 0.0009
2014-10-29 2014-09-30 13F MASTEC COM 576323109 27,057 987 3.79 828 3.11 0.0012
2014-08-06 2014-06-30 13F MASTEC COM 576323109 26,070 2,355 9.93 803 -22.04 0.0012
2014-05-02 2014-03-31 13F MASTEC COM 576323109 23,715 2,899 13.93 1,030 51.25 0.0017
2014-02-12 2013-12-31 13F MASTEC COM 576323109 20,816 -531 -2.49 681 5.26 0.0011
2013-11-12 2013-09-30 13F MASTEC COM 576323109 21,347 -429 -1.97 647 -9.76 0.0012
2013-08-13 2013-06-30 13F MASTEC COM 576323109 21,776 21,776 717 0.0014
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.