Westfield Capital Management’s MasTec MTZ Stock Holding History

Westfield Capital Management’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
2026 Q2	$156M	Buy	374,457 +124,477	+50%	+$47.6M	0.51%	53
2026 Q1	$80.4M	Buy	+249,980	New	+$67.7M	0.34%	98
2018 Q4	–	Sell	-532,659	Closed	-$23.8M	–	258
2018 Q3	$23.8M	Sell	532,659 -238,010	-31%	-$11M	0.17%	170
2018 Q2	$39.1M	Buy	770,669 +290,379	+60%	+$14M	0.29%	112
2018 Q1	$22.6M	Sell	480,290 -351,385	-42%	-$17.8M	0.17%	168
2017 Q4	$40.7M	Buy	831,675 +455,660	+121%	+$20.3M	0.31%	121
2017 Q3	$17.4M	Buy	376,015 +108,600	+41%	+$4.73M	0.13%	193
2017 Q2	$12.1M	Buy	+267,415	New	+$11.6M	0.1%	193
2017 Q1	–	Sell	-291,906	Closed	-$11.2M	–	288
2016 Q4	$11.2M	Sell	291,906 -457,020	-61%	-$15.5M	0.1%	208
2016 Q3	$22.3M	Buy	748,926 +255,175	+52%	+$7M	0.18%	164
2016 Q2	$11M	Sell	493,751 -48,139	-9%	-$1.07M	0.09%	197
2016 Q1	$11M	Buy	+541,890	New	+$8.87M	0.08%	193
2014 Q2	–	Sell	-1,213,119	Closed	-$52.7M	–	338
2014 Q1	$52.7M	Buy	+1,213,119	New	+$46M	0.32%	109

Other funds holding MTZ

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

Peconic Partners New York $8.04B AUM 107.18% 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

Westfield Capital Management's MTZ Position: Q2 2026 in Review

Westfield Capital Management increased its MasTec (MTZ) stake by 50% in Q2 2026, buying an estimated $47.6M and bringing the position to 374,457 shares worth $156M. The position accounts for 0.51% of the portfolio, ranked #53.

Westfield Capital Management first reported a position in MTZ in Q1 2014 and has held it in 13 quarters since. 910 funds tracked by Wall St. Rank hold MTZ as of Q2 2026.

Westfield Capital Management held 374,457 shares of MasTec worth $156M as of Q2 2026.
Westfield Capital Management bought 124,477 MasTec shares in Q2 2026, an estimated $47.6M.
MasTec made up 0.51% of Westfield Capital Management's portfolio in Q2 2026, its #53 holding.
Westfield Capital Management first reported a position in MasTec in Q1 2014 and has held it in 13 quarters since.
910 funds tracked by Wall St. Rank held MasTec as of Q2 2026.

Based on Westfield Capital Management's 13F filing for Q2 2026, filed 12 Aug 2026.