William Blair & Company
ZS icon

William Blair & Company’s Zscaler ZS Stock Holding History

William Blair & Company’s Portfolio ZS Stock Details ZS Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$232K Buy
1,653
+629
+61% +$112K ﹤0.01% 1425
2025
Q4 		$230K Sell
1,024
-1,441
-58% -$407K ﹤0.01% 1411
2025
Q3 		$739K Buy
+2,465
New +$703K ﹤0.01% 996
2024
Q4 		– Sell
-1,402
Closed -$240K – 1892
2024
Q3 		$240K Buy
1,402
+50
+4% +$9.13K ﹤0.01% 1378
2024
Q2 		$260K Sell
1,352
-478
-26% -$85.1K ﹤0.01% 1309
2024
Q1 		$353K Sell
1,830
-76
-4% -$17K ﹤0.01% 1196
2023
Q4 		$422K Buy
1,906
+295
+18% +$54.6K ﹤0.01% 1116
2023
Q3 		$251K Buy
+1,611
New +$242K ﹤0.01% 1307
2022
Q3 		– Sell
-1,645
Closed -$246K – 1894
2022
Q2 		$246K Sell
1,645
-777
-32% -$137K ﹤0.01% 1340
2022
Q1 		$584K Sell
2,422
-433
-15% -$106K ﹤0.01% 1105
2021
Q4 		$917K Sell
2,855
-1,108
-28% -$349K ﹤0.01% 994
2021
Q3 		$1.04M Buy
3,963
+450
+13% +$113K ﹤0.01% 910
2021
Q2 		$759K Buy
3,513
+684
+24% +$130K ﹤0.01% 1007
2021
Q1 		$486K Buy
2,829
+112
+4% +$22.3K ﹤0.01% 1131
2020
Q4 		$543K Sell
2,717
-338
-11% -$53.7K ﹤0.01% 1059
2020
Q3 		$430K Buy
3,055
+660
+28% +$85.7K ﹤0.01% 1016
2020
Q2 		$262K Buy
+2,395
New +$199K ﹤0.01% 1148
2020
Q1 		– Sell
-4,595
Closed -$214K – 1781
2019
Q4 		$214K Buy
+4,595
New +$213K ﹤0.01% 1284

Other funds holding ZS

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
First Trust Advisors
First Trust Advisors Wheaton, Illinois $140B AUM 27.84% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 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 ZS Position: Q1 2026 in Review

William Blair & Company increased its Zscaler (ZS) stake by 61% in Q1 2026, buying an estimated $112K and bringing the position to 1,653 shares worth $232K. The position accounts for ﹤0.01% of the portfolio, ranked #1425.

William Blair & Company first reported a position in ZS in Q4 2019 and has held it in 18 quarters since. The position peaked at $1.04M in Q3 2021. 748 funds tracked by Wall St. Rank hold ZS as of Q1 2026.

  • William Blair & Company held 1,653 shares of Zscaler worth $232K as of Q1 2026.
  • William Blair & Company bought 629 Zscaler shares in Q1 2026, an estimated $112K.
  • Zscaler made up ﹤0.01% of William Blair & Company's portfolio in Q1 2026, its #1425 holding.
  • William Blair & Company first reported a position in Zscaler in Q4 2019 and has held it in 18 quarters since.
  • William Blair & Company's Zscaler position peaked at $1.04M in Q3 2021.
  • 748 funds tracked by Wall St. Rank held Zscaler as of Q1 2026.

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