MasTec, Inc. (MTZ) ownership: Top institutional holder: BlackRock, Inc. ($2.35B). Insider activity: Net Seller (6 buys, 14 sells). 10 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| BlackRock, Inc. | 7309609.00 | $2.35B | 2026-03-31 |
| VANGUARD GROUP INC | 5932754.00 | $1.29B | 2025-12-31 |
| PECONIC PARTNERS LLC | 3578431.00 | $1.15B | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 2804295.00 | $902.25M | 2026-03-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 2770038.00 | $891.23M | 2026-03-31 |
| Hill City Capital, LP | 2155000.00 | $693.35M | 2026-03-31 |
| STATE STREET CORP | 1869788.00 | $601.59M | 2026-03-31 |
| VICTORY CAPITAL MANAGEMENT INC | 1592523.00 | $512.38M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-05-15 | |
| Sell | null | 2026-05-15 | |
| Buy | null | 2026-05-15 | |
| Sell | null | 2026-05-15 | |
| Buy | null | 2026-05-15 | |
| Sell | null | 2026-05-15 | |
| Sell | null | 2026-05-15 | |
| Buy | null | 2026-05-15 |
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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.