CASTLEARK MANAGEMENT LLC

Position in UCTT — Ultra Clean Holdings, Inc.

CIK 1106832 CHICAGO, IL

Position in UCTT

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

Position Value

$13,655,844

+$7,429,761 QoQ

Shares Held

95,770

-4.4% QoQ

Ownership

0.212%

of shares outstanding

% of Portfolio

0.42%

of 13F equity value

Holder Rank

#68

of 435 holders

Holding Since

Jun 2021

3 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Technology · as of Jun 30, 2026

CASTLEARK MANAGEMENT LLC holds $151,003,966 across 5 Semiconductor Equipment & Materials names. UCTT ranks #2 (9.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	LRCX	Lam Research Corp	283,808	$122,982,520
2	UCTT	Ultra Clean Holdings, Inc. This page	95,770	$13,655,844
3	KLIC	Kulicke & Soffa Industries Inc	86,950	$11,630,432
4	CAMT	Camtek Ltd	9,830	$1,603,469
5	TER	Teradyne, Inc	2,339	$1,131,701

3 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$13,655,844	95,770	-4.4%	Shares	Sole	2026-08-14
2026-03-31	$6,226,083	100,130	-22.3%	Shares	Sole	2026-05-15
2021-06-30	$6,921,768	128,849	—	Shares	Sole	2021-08-17
No filing history on record for this holder in this stock.