Mastec MTZ Institutional Ownership

Updated Oct 21, 2026

Mastec Inc (NYSE:MTZ) was reported as a holding by 908 institutional investors in 13F filings for the quarter ended June 30, 2026.

• Their combined stake equaled 74.01% of outstanding shares in Q2 2026, up from 73.15% in Q1 2026.
• Total shares held in Mastec rose 2.83% from Q1 2026, while the number of holders rose 53.64% from Q2 2025.
• Of these 908 holders, 513 added to their positions, 290 reduced their stakes and 105 left their positions unchanged.
• Institutional investors held 59.44Mn shares of Mastec in total at the end of Q2 2026, up 1.63Mn from the prior quarter and up 4.22Mn from a year earlier.
• As of June 30, 2026, the biggest holder of Mastec was BlackRock, Inc. with 7.64Mn shares, or 9.51% of shares outstanding.
• The biggest increases in MTZ positions during Q2 2026 came from JPMorgan Chase & Co (+1.12Mn shares), Ameriprise Financial Inc (+503.18K shares), State Street Corp (+374.98K shares), BlackRock, Inc. (+328.88K shares) and FMR LLC (+262.2K shares).
• The largest position reductions in MTZ for Q2 2026 were by Millennium Management LLC (-459.3K shares), Victory Capital Management Inc (-382.44K shares), Nomura Asset Management International Inc. (-279.3K shares), Point72 Asset Management, L.P. (-276.75K shares) and Nordea Investment Management AB (-204.16K shares).
• Mastec's 10 largest institutional shareholders as of Q2 2026 were BlackRock, Inc. (7.64Mn shares), Peconic Partners LLC (3.68Mn shares), Vanguard Capital Management LLC (2.83Mn shares), Vanguard Portfolio Management LLC (2.81Mn shares), State Street Corp (2.24Mn shares), Hill City Capital, LP (2.15Mn shares), Lone Pine Capital LLC (1.35Mn shares), Bank of America Corp (1.34Mn shares), First Trust Advisors LP (1.33Mn shares) and JPMorgan Chase & Co (1.32Mn shares), per Business Quant data.