WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

Position in ONTO — Onto Innovation Inc.

CIK 1644956 CHICAGO, IL

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Position in ONTO

as of Jun 30, 2026 · filed Aug 12, 2026 Compact

Position Value

$251,811,925

+$54,080,766 QoQ

Shares Held

665,377

-31.0% QoQ

Ownership

1.36%

of shares outstanding

% of Portfolio

0.77%

of 13F equity value

Holder Rank

#13

of 686 holders

Holding Since

Jun 2023

11 quarters on record

Voting authority Sole 94% Shared 0% None 6%

Common Shares in ONTO Over Time

Shares Held

Position Value (USD)

Position in Semiconductor Equipment & Materials

Technology · as of Jun 30, 2026

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds $683,895,121 across 5 Semiconductor Equipment & Materials names. ONTO ranks #2 (36.8% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	AMAT	Applied Materials Inc /De	497,946	$360,014,958
2	ONTO	Onto Innovation Inc. This page	665,377	$251,811,925
3	LRCX	Lam Research Corp	102,273	$44,317,959
4	KLIC	Kulicke & Soffa Industries Inc	192,709	$25,776,755
5	ASML	Asml Holding NV	992	$1,973,524

All Filings in ONTO

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11 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$251,811,925	665,377	-31.0%	Shares	Sole	2026-08-12
2026-03-31	$197,731,159	964,213	-44.2%	Shares	Sole	2026-05-08
2025-12-31	$272,559,023	1,726,587	-12.9%	Shares	Sole	2026-02-09
2025-09-30	$256,083,156	1,981,761	+80.3%	Shares	Sole	2025-11-12
2025-06-30	$110,907,939	1,098,860	+650.4%	Shares	Sole	2025-07-29
2025-03-31	$17,769,150	146,441	+60.0%	Shares	Sole	2025-05-09
2024-06-30	$20,092,594	91,513	-71.3%	Shares	Sole	2024-08-08
2024-03-31	$57,724,863	318,781	-8.1%	Shares	Sole	2024-05-08
2023-12-31	$53,032,753	346,846	-2.2%	Shares	Sole	2024-02-09
2023-09-30	$45,212,598	354,553	+18.7%	Shares	Sole	2023-11-09
2023-06-30	$34,776,078	298,584	—	Shares	Sole	2023-08-11
No filing history on record for this holder in this stock.