MasTec, Inc. (MTZ) ownership: insiders 21% · institutions 74% (13F 2026-03-31). Insider activity, 90 days: 0 sales, 0 open-market buys. 10 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | % Outstanding | Reported |
|---|---|---|---|---|
| BlackRock | 7309609.00 | $2.35B | 9.1% | 2026-03-31 |
| Vanguard | 6054831.00 | $1.95B | 7.5% | 2026-03-31 |
| Peconic Partners LLC | 3578431.00 | $1.15B | 4.5% | 2026-03-31 |
| Hill City Capital, LP | 2155000.00 | $693.35M | 2.7% | 2026-03-31 |
| State Street | 1869788.00 | $601.59M | 2.3% | 2026-03-31 |
| Victory Capital | 1592523.00 | $512.38M | 2.0% | 2026-03-31 |
| Lone Pine Capital LLC | 1531050.00 | $492.60M | 1.9% | 2026-03-31 |
| First Trust Advisors LP | 1411584.00 | $454.16M | 1.8% | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-08-14 | |
| Sell | null | 2026-08-14 | |
| Sell | null | 2026-08-14 | |
| Sell | null | 2026-08-14 | |
| Sell | null | 2026-08-14 | |
| Sell | null | 2026-08-14 | |
| Sell | null | 2026-08-14 | |
| Sell | null | 2026-08-14 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.