Who owns MasTec (MTZ)?
136 holders named in SEC filings declare between 69.2% and 89.5% of MasTec's shares outstanding, as of Aug 14, 2026. The largest are Jorge Mas (14.3%), BlackRock (9.5%) and Vanguard (7.5%); the five largest hold 42.4% together. Another 776 institutions hold small positions worth 5.8%. At least 4.6% of the shares appear in no ownership filing: investors who do not have to report, mostly individuals. From Mar 31, 2026 to Jun 30, 2026, institutions that filed both quarters bought 9.8% and sold 8.2% of the shares, a net purchase of 1.7%; 163 opened a position, 313 added, 289 reduced and 70 sold out. Biggest buyers: JPMorgan (+1.1M shares) and T. Rowe Price (+815,353 shares). Biggest sellers: Millennium (-459,301) and Victory Capital Management, Inc. (-382,444). Schedule 13D/G filings since Mar 31, 2026: BlackRock, Inc. raised its stake to 8.0% on Jun 30, 2026. Directors and officers, from their latest Form 4: Jorge Mas (14.3%) and Jose Ramon Mas (6.5%). Over time, 894 managers declared MasTec in their 13F for Q2 2026, against 376 for Q4 2019: together at most 75.2% of the shares outstanding, against 85.1%.
| Holder | Filing | Share of capital | As of | Holding since (13F) |
|---|---|---|---|---|
| Jorge Mas | Form 4 | 14.3% | Mar 18, 2026 | — |
| BlackRock | 13F | 9.5% | Jun 30, 2026 | Q4 2019 or earlier |
| Vanguard | 13F | 7.5% | Jun 30, 2026 | Q4 2019 or earlier |
| Jose Ramon Mas | Form 4 | 6.5% | Mar 18, 2026 | — |
| PECONIC PARTNERS LLC | 13F | 4.6% | Jun 30, 2026 | Q3 2025 |
| State Street | 13F | 2.8% | Jun 30, 2026 | Q4 2019 or earlier |
| Hill City Capital, LP | 13F | 2.7% | Jun 30, 2026 | Q4 2022 |
| Lone Pine Capital LLC | 13F | 1.7% | Jun 30, 2026 | Q1 2026 |
| Bank of America | 13F | 1.7% | Jun 30, 2026 | Q4 2019 or earlier |
| FIRST TRUST ADVISORS LP | 13F | 1.7% | Jun 30, 2026 | Q4 2019 or earlier |
| JPMorgan | 13F | 1.6% | Jun 30, 2026 | Q4 2019 or earlier |
| Geode Capital | 13F | 1.6% | Jun 30, 2026 | Q4 2019 or earlier |
| Invesco | 13F | 1.5% | Jun 30, 2026 | Q4 2019 or earlier |
| Victory Capital Management, Inc. | 13F | 1.5% | Jun 30, 2026 | Q4 2019 or earlier |
| Hood River Capital Management LLC | 13F | 1.5% | Jun 30, 2026 | Q4 2020 |
| UBS | 13F | 1.1% | Jun 30, 2026 | Q4 2019 or earlier |
| Fidelity (FMR) | 13F | 1.1% | Jun 30, 2026 | Q4 2019 or earlier |
| T. Rowe Price | 13F | 1.1% | Jun 30, 2026 | Q4 2019 or earlier |
| Ameriprise Financial, Inc. | 13F | 0.92% | Jun 30, 2026 | Q4 2019 or earlier |
| Mirae Asset | 13F | 0.89% | Jun 30, 2026 | Q4 2019 or earlier |
| BNY | 13F | 0.84% | Jun 30, 2026 | Q4 2019 or earlier |
| AQR | 13F | 0.82% | Jun 30, 2026 | Q4 2019 or earlier |
| Morgan Stanley | 13F | 0.81% | Jun 30, 2026 | Q4 2019 or earlier |
| Dimensional | 13F | 0.79% | Jun 30, 2026 | Q4 2019 or earlier |
| Electron Capital Partners, LLC | 13F | 0.77% | Jun 30, 2026 | Q4 2020 |
MasTec institutional ownership over time
| Quarter | 13F managers | Share of the company (upper bound) | Value declared | Held by stock pickers |
|---|---|---|---|---|
| Q4 2019 | 376 | 85.1% | $4.0B | 59.0% |
| Q4 2020 | 339 | 80.2% | $4.0B | 64.7% |
| Q4 2021 | 377 | 68.3% | $4.7B | 62.1% |
| Q4 2022 | 380 | 74.5% | $5.0B | 62.7% |
| Q4 2023 | 362 | 78.2% | $4.7B | 66.3% |
| Q4 2024 | 525 | 72.6% | $7.8B | 56.1% |
| Q4 2025 | 688 | 74.4% | $12.8B | 57.3% |
| Q2 2026 | 894 | 75.2% | $24.7B | 53.9% |
From SEC Form 13F, every quarter since the end of 2019, read like the current quarter: entities of a house summed, a value contradicting its share count set aside. The share of the company is an upper bound — two managers can declare the same shares — over the shares outstanding at that date.