MasTec
MTZ · NYSE
Who owns MTZ
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 49.1% of MTZ’s shares.
- Mas (Jorge L)15.0%
- BlackRock Institutional Trust Company, N.A.7.5%
- Mas (Jose Ramon)5.7%
- Peconic Partners, LLC4.7%
- Next 6 largest institutions16.1%
- All other shareholders50.9%
| Holder | Shares | % of shares |
|---|---|---|
| Mas (Jorge L) | 11.87M | 15.02% |
| BlackRock Institutional Trust Company, N.A. | 5.96M | 7.55% |
| Mas (Jose Ramon) | 4.54M | 5.74% |
| Peconic Partners, LLC | 3.68M | 4.66% |
| Vanguard Capital Management, LLC | 2.83M | 3.58% |
| Vanguard Portfolio Management, LLC | 2.81M | 3.56% |
| State Street Investment Management (US) | 2.24M | 2.84% |
| Hill City Capital LP | 2.15M | 2.73% |
| Lone Pine Capital, L.L.C. | 1.35M | 1.70% |
| First Trust Advisors L.P. | 1.33M | 1.68% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| iShares Core S&P Mid-Cap ETF | 2.16M | 2.73% |
| Vanguard Total Stock Market Index Fund | 2.01M | 2.55% |
| Vanguard Small-Cap Index Fund | 1.45M | 1.84% |
| Vanguard Small-Cap Growth Index Fund | 840.44K | 1.06% |
| Vanguard Extended Market Index Fund | 709.48K | 0.90% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $3.66M (2 trades) of MTZ on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Miranda Manuel Benito | Award | 152 | — |
| Palomarez Javier Alberto | Tax withholding | 31 | $9.23K |
| Palomarez Javier Alberto | Award | 139 | — |
| Spiro Alex | Award | 139 | — |
| Parker Ava L | Tax withholding | 20 | $5.95K |
| Parker Ava L | Award | 177 | — |
| Csiszar Ernst N | Tax withholding | 34 | $10.12K |
| Csiszar Ernst N | Award | 152 | — |
| Campbell C Robert | Award | 139 | — |
| Dwyer Robert J | Tax withholding | 31 | $9.23K |
Congressional trades
Disclosed by members of Congress over the last 12 months
| Member | Type | Amount | Traded |
|---|---|---|---|
| Thomas KeanHouse | Purchase | $1K–$15K | Aug 21, 2026 |
| Markwayne MullinSenator | Sale (Full) | $15K–$50K | Feb 4, 2026 |
| Markwayne MullinSenator | Sale (Full) | $15K–$50K | Dec 18, 2025 |
| Lisa McClainHouse | Sale | $1K–$15K | Oct 31, 2025 |
| Lisa McClainHouse | Purchase | $1K–$15K | Oct 30, 2025 |
Short interest
Settled Sep 30, 2026
- Shares short
- 4.59M
- Days to cover
- 2.61
- % of shares outstanding
- 5.81%
- Average daily volume
- 1.76M
- Change since last report
- −15.2%
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