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MTZ · Mastec Inc

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Market Cap
$20.17B
Shares
80.30M

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.

Holders: 917
Total Value: $25,504,689,597
Total Shares: 61,300,510
Showing 1–100 of 942 holdings by value · page 1 of 10

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 917 13F filers · Δ vs Mar 31, 2026
Top Holder
12.5%
Sep 2023 → Jun 2026 · range 9.3% – 14.4%
+0.1 pts
Top 5
31.3%
Sep 2023 → Jun 2026 · range 31.1% – 35.2%
−0.2 pts
Top 10
43.5%
Sep 2023 → Jun 2026 · range 43.5% – 48.9%
−1.1 pts
HHI
320
Sep 2023 → Jun 2026 · range 320 – 415
Broadly held−2

Quarterly Activity

vs Mar 31, 2026
New
187
Increased
328
Decreased
298
Sold Out
84
Unchanged
104
Holder count: +103
Institutional value: +34.2%
Shares held: +3.7%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 942
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 15615 CUSIP 576323109 13F (30d) 682 filings 653 filers Visit website Investor relations