William Harnisch’s MasTec MTZ Stock Holding History

William Harnisch’s Portfolio MTZ Stock Details MTZ Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2019 Q1	–	Sell	-500	Closed	-$20K	–	57
2018 Q4	$20K	Buy	+500	New	+$21.5K	﹤0.01%	40

Other funds holding MTZ

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

HCC

Hill City Capital Boston, Massachusetts $4.28B AUM 80.76% 1-Year Est. Return

JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return

LPC

Lone Pine Capital Greenwich, Connecticut $16.4B AUM 99.7% 1-Year Est. Return

Bank of America Charlotte, North Carolina $1.55T AUM 33.47% 1-Year Est. Return

First Trust Advisors Wheaton, Illinois $170B AUM 46.21% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

William Harnisch's MTZ Position: Q2 2026 in Review

William Harnisch increased its MasTec (MTZ) stake by 2.8% in Q2 2026, buying an estimated $38.2M and bringing the position to 3,678,431 shares worth $1.53B. The position accounts for 19.02% of the portfolio, ranked #3.

William Harnisch first reported a position in MTZ in Q2 2013 and has held it in 40 quarters since. 908 funds tracked by Wall St. Rank hold MTZ as of Q2 2026.

William Harnisch held 3,678,431 shares of MasTec worth $1.53B as of Q2 2026.
William Harnisch bought 100,000 MasTec shares in Q2 2026, an estimated $38.2M.
MasTec made up 19.02% of William Harnisch's portfolio in Q2 2026, its #3 holding.
William Harnisch first reported a position in MasTec in Q2 2013 and has held it in 40 quarters since.
908 funds tracked by Wall St. Rank held MasTec as of Q2 2026.

Based on Peconic Partners's 13F filing for Q2 2026, filed 14 Aug 2026.