William Blair Investment Management
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William Blair Investment Management’s Onto Innovation ONTO Stock Holding History

William Blair Investment Management’s Portfolio ONTO Stock Details ONTO Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$252M Sell
665,377
-298,836
-31% -$84.6M 0.76% 18
2026
Q1 		$198M Sell
964,213
-762,374
-44% -$156M 0.65% 27
2025
Q4 		$273M Sell
1,726,587
-255,174
-13% -$36.2M 0.76% 24
2025
Q3 		$256M Buy
1,981,761
+882,901
+80% +$94.5M 0.66% 29
2025
Q2 		$111M Buy
1,098,860
+952,419
+650% +$102M 0.29% 91
2025
Q1 		$17.8M Buy
+146,441
New +$24.7M 0.05% 304
2024
Q3 		– Sell
-91,513
Closed -$20.1M – 438
2024
Q2 		$20.1M Sell
91,513
-227,268
-71% -$47M 0.05% 304
2024
Q1 		$57.7M Sell
318,781
-28,065
-8% -$4.74M 0.15% 141
2023
Q4 		$53M Sell
346,846
-7,707
-2% -$1.04M 0.15% 136
2023
Q3 		$45.2M Buy
354,553
+55,969
+19% +$6.65M 0.15% 139
2023
Q2 		$34.8M Buy
+298,584
New +$28.5M 0.11% 198

Other funds holding ONTO

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
PCMI
Paradigm Capital Management Inc Albany, New York $3.67B AUM 121.12% 1-Year Est. Return
Point72 Asset Management
Point72 Asset Management Stamford, Connecticut $90.7B AUM 77.13% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return

William Blair Investment Management's ONTO Position: Q2 2026 in Review

William Blair Investment Management reduced its Onto Innovation (ONTO) stake by 31% in Q2 2026, selling an estimated $84.6M and leaving 665,377 shares worth $252M. The position accounts for 0.76% of the portfolio, ranked #18.

William Blair Investment Management first reported a position in ONTO in Q2 2023 and has held it in 11 quarters since. The position peaked at $273M in Q4 2025. 688 funds tracked by Wall St. Rank hold ONTO as of Q2 2026.

  • William Blair Investment Management held 665,377 shares of Onto Innovation worth $252M as of Q2 2026.
  • William Blair Investment Management sold 298,836 Onto Innovation shares in Q2 2026, an estimated $84.6M.
  • Onto Innovation made up 0.76% of William Blair Investment Management's portfolio in Q2 2026, its #18 holding.
  • William Blair Investment Management first reported a position in Onto Innovation in Q2 2023 and has held it in 11 quarters since.
  • William Blair Investment Management's Onto Innovation position peaked at $273M in Q4 2025.
  • 688 funds tracked by Wall St. Rank held Onto Innovation as of Q2 2026.

Based on William Blair Investment Management's 13F filing for Q2 2026, filed 12 Aug 2026.