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
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 $5.78B AUM 127.23% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
HCC
Hill City Capital Boston, Massachusetts $2.8B AUM 79.27% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Victory Capital Management
Victory Capital Management San Antonio, Texas $178B AUM 37.23% 1-Year Est. Return
LPC
Lone Pine Capital Greenwich, Connecticut $12.5B AUM 54.4% 1-Year Est. Return
First Trust Advisors
First Trust Advisors Wheaton, Illinois $140B AUM 27.84% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

William Blair & Company's MTZ Position: Q1 2026 in Review

William Blair & Company increased its MasTec (MTZ) stake by 2.9% in Q1 2026, buying an estimated $13.5K and bringing the position to 1,794 shares worth $577K. The position accounts for ﹤0.01% of the portfolio, ranked #1104.

William Blair & Company first reported a position in MTZ in Q4 2024 and has held it in 5 quarters since. 807 funds tracked by Wall St. Rank hold MTZ as of Q1 2026.

  • William Blair & Company held 1,794 shares of MasTec worth $577K as of Q1 2026.
  • William Blair & Company bought 50 MasTec shares in Q1 2026, an estimated $13.5K.
  • MasTec made up ﹤0.01% of William Blair & Company's portfolio in Q1 2026, its #1104 holding.
  • William Blair & Company first reported a position in MasTec in Q4 2024 and has held it in 5 quarters since.
  • 807 funds tracked by Wall St. Rank held MasTec as of Q1 2026.

Based on William Blair & Company's 13F filing for Q1 2026, filed 8 May 2026.