William Blair & Company
MTZ icon

William Blair & Company’s MasTec MTZ Stock Holding History

William Blair & Company’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 		$763K Buy
1,835
+41
+2% +$15.7K ﹤0.01% 1071
2026
Q1 		$577K Buy
1,794
+50
+3% +$13.5K ﹤0.01% 1104
2025
Q4 		$379K Sell
1,744
-734
-30% -$154K ﹤0.01% 1231
2025
Q3 		$527K Buy
2,478
+1,000
+68% +$183K ﹤0.01% 1097
2025
Q2 		$252K Buy
+1,478
New +$213K ﹤0.01% 1328
2025
Q1 		– Sell
-1,478
Closed -$201K – 1853
2024
Q4 		$201K Buy
+1,478
New +$198K ﹤0.01% 1438

Other funds holding MTZ

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
PP
Peconic Partners New York $8.04B AUM 107.18% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
State Street
State Street Boston, Massachusetts $3.38T AUM 44.17% 1-Year Est. Return
HCC
Hill City Capital Boston, Massachusetts $4.28B AUM 80.76% 1-Year Est. Return
JP Morgan Chase
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
Bank of America Charlotte, North Carolina $1.55T AUM 33.47% 1-Year Est. Return
First Trust Advisors
First Trust Advisors Wheaton, Illinois $170B AUM 46.21% 1-Year Est. Return

William Blair & Company's MTZ Position: Q2 2026 in Review

William Blair & Company increased its MasTec (MTZ) stake by 2.3% in Q2 2026, buying an estimated $15.7K and bringing the position to 1,835 shares worth $763K. The position accounts for ﹤0.01% of the portfolio, ranked #1071.

William Blair & Company first reported a position in MTZ in Q4 2024 and has held it in 6 quarters since. 912 funds tracked by Wall St. Rank hold MTZ as of Q2 2026.

  • William Blair & Company held 1,835 shares of MasTec worth $763K as of Q2 2026.
  • William Blair & Company bought 41 MasTec shares in Q2 2026, an estimated $15.7K.
  • MasTec made up ﹤0.01% of William Blair & Company's portfolio in Q2 2026, its #1071 holding.
  • William Blair & Company first reported a position in MasTec in Q4 2024 and has held it in 6 quarters since.
  • 912 funds tracked by Wall St. Rank held MasTec as of Q2 2026.

Based on William Blair & Company's 13F filing for Q2 2026, filed 11 Aug 2026.