MasTec Inc (MTZ) is gone from Ronald Muhlenkamp's Muhlenkamp & Co portfolio as of June 30, 2026, according to the 13F-HR filed with the SEC on August 18, 2026. A quarter earlier the position was 42.8K shares worth about $13.8M, or 3.63% of the reported book. MTZ had been in the portfolio for about 6 years, since the quarter ended June 30, 2020.
What did the 2026 Q2 filing report for MTZ?
As of June 30, 2026, from the 13F-HR filed August 18, 2026.
| Before | After | |
|---|---|---|
| Shares | 42.8K | 0 |
| Reported value | $13.8M | $0 |
| Portfolio weight | 3.63% | 0% |
| Held since | 2020 Q2 | sold out in 2026 Q2 |
| Quarters held | 23 |
What did Ronald Muhlenkamp sell?
Ronald Muhlenkamp sold 42.8K shares of MTZ between the quarter ended March 31, 2026 and June 30, 2026. The MTZ exit was the largest of the quarter's 25 position changes by percent change to portfolio.
Where does MTZ sit in the Ronald Muhlenkamp portfolio?
Before the sale, MTZ carried 3.63% of the Ronald Muhlenkamp portfolio, about the fund's average stock position of 4%. The largest stock position is RUSHA at 7.03%. Next come NEM at 6.25% and AEM at 6.22%. The three largest stocks together are 19.5% of the book. Across the 2026 Q2 portfolio, Ronald Muhlenkamp reported 28 stock positions, with 1 opened and 2 closed. The total portfolio value is about $345.3M, down 9% from the prior quarter.
How long has Ronald Muhlenkamp held MTZ?
Ronald Muhlenkamp held MTZ for about 6 years, from the quarter ended June 30, 2020 to March 31, 2026. The weight peaked at 6.18% in 2025 Q4. Last quarter the fund had already cut the position by 60%, so the exit finishes a two-quarter unwind. Every reported trade is on the Ronald Muhlenkamp MTZ trade history page.
Did other funds buy or sell MTZ in 2026 Q2?
Among the other tracked funds that had filed for 2026 Q2 as of August 18, 2026, 2 still hold MTZ. The largest sellers were Stephen Mandel and Daniel Loeb. Every tracked holder of MTZ is on the MTZ ownership page.
FAQ
How many MTZ shares did Ronald Muhlenkamp sell?
Ronald Muhlenkamp sold all 42.8K shares of MTZ it reported a quarter earlier, worth about $13.8M.
When did Ronald Muhlenkamp first buy MTZ?
Ronald Muhlenkamp first reported MTZ in the quarter ended June 30, 2020.
How much of the Ronald Muhlenkamp portfolio was MTZ?
MTZ was 3.63% of the Ronald Muhlenkamp portfolio at the prior quarter-end, and 0% after the sale.
Did other funds sell MTZ in 2026 Q2?
No other tracked fund sold out of MTZ in 2026 Q2, but 2 trimmed it; 2 still hold it.