MasTec, Inc.
US ˙ NYSE ˙ US5763231090

SecurityMTZ / MasTec, Inc.
InstitutionNatixis Advisors, L.p.
Latest Disclosed Ownership17,078 shares
Latest Disclosed Value $ 5,495
Natixis Advisors, L.p. reports 15.10% increase in ownership of MTZ / MasTec, Inc.

On May 13, 2026 - Natixis Advisors, L.p. filed a 13F-HR form disclosing ownership of 17,078 shares of MasTec, Inc. (US:MTZ) valued at $5,494,676 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 14,837 shares of MasTec, Inc.. This represents a change in shares of 15.10% during the quarter. The current value of the position is $6,214,513 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)
2026-05-13 2026-03-31 13F MASTEC COM 576323109 17,078 2,241 15.10 5 66.67 0.0076
2026-02-10 2025-12-31 13F MASTEC COM 576323109 14,837 -2,946 -16.57 3 0.00 0.0046
2025-11-13 2025-09-30 13F MASTEC INC COM 576323109 17,783 3,540 24.85 4 50.00 0.0055
2025-08-13 2025-06-30 13F MASTEC COM 576323109 14,243 1,916 15.54 2 100.00 0.0039
2025-05-08 2025-03-31 13F MASTEC COM 576323109 12,327 398 3.34 1 0.00 0.0027
2025-02-10 2024-12-31 13F MASTEC COM 576323109 11,929 136 1.15 2 0.00 0.0030
2024-11-06 2024-09-30 13F MASTEC COM 576323109 11,793 58 0.49 1 0.00 0.0028
2024-08-01 2024-06-30 13F MASTEC COM 576323109 11,735 11,735 1 0.0027
2016-02-12 2015-12-31 13F MASTEC COM 576323109 0 0 0 0.0000
2015-11-12 2015-09-30 13F MASTEC COM 576323109 0 0 0 0.0000
2015-08-14 2015-06-30 13F MASTEC COM 576323109 0 -32,311 -100.00 0 -100.00
2015-05-15 2015-03-31 13F MASTEC COM 576323109 32,311 12,866 66.17 624 41.82 0.0110
2015-02-05 2014-12-31 13F MASTEC COM 576323109 19,445 -20,622 -51.47 440 -64.14 0.0082
2014-11-03 2014-09-30 13F MASTEC COM 576323109 40,067 29,617 283.42 1,227 281.06 0.0246
2014-08-13 2014-06-30 13F MASTEC COM 576323109 10,450 -348,621 -97.09 322 -97.94 0.0046
2014-05-13 2014-03-31 13F MASTEC COM 576323109 359,071 -41,814 -10.43 15,598 18.91 0.2401
2014-02-12 2013-12-31 13F MASTEC COM 576323109 400,885 25,715 6.85 13,117 15.39 0.2147
2013-10-30 2013-09-30 13F MASTEC COM 576323109 375,170 -74,358 -16.54 11,368 -23.14 0.2093
2013-07-19 2013-06-30 13F MASTEC COM 576323109 449,528 449,528 14,790 0.2947
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.