MasTec Inc
Ownership
Ownership Structure
Who owns MasTec Inc (MTZ)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 77.7% of the shares are freely tradable; institutional investors hold 75.8%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 9.51 | 7,638,487 | +4.5 | 06/30/2026 |
| Peconic Partners LLC | 4.58 | 3,678,431 | +2.8 | 06/30/2026 |
| Vanguard Capital Management, LLC | 3.53 | 2,831,849 | +1.0 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 3.50 | 2,812,131 | +1.5 | 06/30/2026 |
| State Street Corp | 2.80 | 2,244,771 | +20.1 | 06/30/2026 |
| Hill City Capital, LP | 2.68 | 2,155,000 | +0.0 | 06/30/2026 |
| Lone Pine Capital LLC | 1.68 | 1,345,157 | -12.1 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Mid-Cap ETF | 2.78 | 2,230,920 | +0.0 | 09/30/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 2.54 | 2,040,685 | +1.5 | 09/30/2026 |
| Vanguard Small Cap Index | 1.80 | 1,446,110 | -0.6 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Johnson Julia L | Director | 73,474 | 14,555,199 $ | Aug 14, 2026 | direct |
| Campbell C Robert | Director | 30,880 | 6,117,328 $ | Aug 14, 2026 | direct |
| Dwyer Robert J | Director | 20,960 | 4,152,176 $ | Aug 14, 2026 | direct |
| Csiszar Ernst N | Director | 10,934 | 2,166,025 $ | Aug 14, 2026 | direct |
| Palomarez Javier Alberto | Director | 10,774 | 2,134,329 $ | Aug 14, 2026 | direct |
| Parker Ava L | Director | 5,549 | 1,099,257 $ | Aug 14, 2026 | direct |
| Miranda Manuel Benito | Director | 152 | 30,111 $ | Aug 14, 2026 | direct |
| Spiro Alex | Director | 139 | 27,536 $ | Aug 14, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 14, 2026 | Miranda Manuel Benito | Director | Other | 152 | 0.00 | – |
| Aug 14, 2026 | Palomarez Javier Alberto | Director | Other | 31 | 297.59 | 9,225 |
| Aug 14, 2026 | Palomarez Javier Alberto | Director | Other | 139 | 0.00 | – |
| Aug 14, 2026 | Csiszar Ernst N | Director | Other | 34 | 297.59 | 10,118 |
| Aug 14, 2026 | Csiszar Ernst N | Director | Other | 152 | 0.00 | – |
| Aug 14, 2026 | Campbell C Robert | Director | Other | 139 | 0.00 | – |
| Aug 14, 2026 | Spiro Alex | Director | Other | 139 | 0.00 | – |
| Aug 14, 2026 | Dwyer Robert J | Director | Other | 31 | 297.59 | 9,225 |
| Aug 14, 2026 | Dwyer Robert J | Director | Other | 139 | 0.00 | – |
| Aug 14, 2026 | Johnson Julia L | Director | Other | 139 | 0.00 | – |
| Aug 14, 2026 | Parker Ava L | Director | Other | 20 | 297.59 | 5,952 |
| Aug 14, 2026 | Parker Ava L | Director | Other | 177 | 0.00 | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: November 3, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.