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Mastec Inc
$360.21 -12.68 (-3.40%) At close · Jul 13
Market Cap
$28.85B
Shares
79,018,556

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

The Jun 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out.
Holders: 813
Total Value: $18,091,580,039
Total Shares: 56,136,656
Showing 1–100 of 837 holdings by value · page 1 of 9

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 807 13F filers
Top Holder
13.0%
Jun 2023 → Mar 2026 · range 9.3% – 14.4%
of institutional value
Top 5
31.5%
Jun 2023 → Mar 2026 · range 31.1% – 35.2%
of institutional value
Top 10
44.3%
Jun 2023 → Mar 2026 · range 43.8% – 48.9%
of institutional value
HHI
330
Jun 2023 → Mar 2026 · range 324 – 413
Broadly held
Showing 100 of 837
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 15615 CUSIP 576323109 13F (30d) 60 filings 50 filers Visit website Investor relations