Driehaus Capital Management LLC

Position in UCTT — Ultra Clean Holdings, Inc.

CIK 938206 Chicago, IL

Position in UCTT

as of Jun 30, 2026 · filed Aug 14, 2026 Compact

Position Value

$186,679,113

+$120,620,574 QoQ

Shares Held

1,309,202

+23.2% QoQ

Ownership

2.89%

of shares outstanding

% of Portfolio

1.09%

of 13F equity value

Holder Rank

of 437 holders

Holding Since

Mar 2020

13 quarters on record

Voting authority Sole 78% Shared 0% None 22%

Technology · as of Jun 30, 2026

Driehaus Capital Management LLC holds $536,307,442 across 10 Semiconductor Equipment & Materials names. UCTT ranks #1 (34.8% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	UCTT	Ultra Clean Holdings, Inc. This page	1,309,202	$186,679,113
2	ONTO	Onto Innovation Inc.	354,650	$134,217,292
3	TER	Teradyne, Inc	103,485	$50,070,182
4	ICHR	Ichor Holdings, Ltd.	432,264	$48,534,601
5	COHU	Cohu Inc	617,323	$45,626,342
6	Q	Qnity Electronics, Inc.	160,990	$26,291,276
7	AEHR	Aehr Test Systems	238,422	$22,902,817
8	NVMI	Nova Ltd.	37,629	$20,430,289

13 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$186,679,113	1,309,202	+23.2%	Shares	Sole	2026-08-14
2026-03-31	$66,058,539	1,062,376	+134.2%	Shares	Sole	2026-05-15
2025-12-31	$11,490,447	453,630	+40.9%	Shares	Sole	2026-02-17
2025-09-30	$8,773,655	321,969	+18.1%	Shares	Sole	2025-11-14
2022-03-31	$11,559,413	272,692	-77.8%	Shares	Sole	2022-05-16
2021-12-31	$70,348,770	1,226,443	+132.0%	Shares	Sole	2022-02-14
2021-09-30	$22,521,299	528,669	-59.8%	Shares	Sole	2021-11-15
2021-06-30	$70,648,246	1,315,120	+2.2%	Shares	Sole	2021-08-16
2021-03-31	$74,696,551	1,286,984	+48.6%	Shares	Sole	2021-05-17
2020-12-31	$26,983,594	866,247	-23.6%	Shares	Sole	2021-02-16
2020-09-30	$24,327,935	1,133,641	+32.8%	Shares	Sole	2020-11-16
2020-06-30	$19,314,501	853,491	+103.4%	Shares	Sole	2020-08-14
2020-03-31	$5,790,342	419,590	—	Shares	Sole	2020-05-15
No filing history on record for this holder in this stock.