SIMPLEX TRADING, LLC

Position in UCTT — Ultra Clean Holdings, Inc.

CIK 1488542 CHICAGO, IL

Position in UCTT

as of Mar 31, 2026 · filed May 14, 2026 Compact

Position Value

$323,957

+$322,286 QoQ

Shares Held

5,210

+7793.9% QoQ

Ownership

0.012%

of shares outstanding

% of Portfolio

0.01%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Jun 2020

14 quarters on record

Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Technology · as of Mar 31, 2026

SIMPLEX TRADING, LLC holds $50,469,092 across 17 Semiconductor Equipment & Materials names. UCTT ranks #8 (0.6% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	ASML	Asml Holding NV	16,741	$22,112,015
2	AXTI	Axt Inc	173,574	$9,890,246
3	CAMT	Camtek Ltd	43,213	$6,551,522
4	AMAT	Applied Materials Inc /De	11,757	$4,018,425
5	LRCX	Lam Research Corp	16,078	$3,435,225
6	TER	Teradyne, Inc	6,572	$1,948,335
7	ACMR	ACM Research, Inc.	24,464	$962,658
8	UCTT	Ultra Clean Holdings, Inc. This page	5,210	$323,957

14 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$323,957	5,210	+7793.9%	Shares	Sole	2026-05-14
2025-12-31	$1,671	66	-91.0%	Shares	Sole	2026-02-11
2025-09-30	$20,028	735	-91.7%	Shares	Sole	2025-11-12
2025-06-30	$200,624	8,889	-13.4%	Shares	Sole	2025-08-05
2025-03-31	$219,688	10,261	+3971.8%	Shares	Sole	2025-05-12
2024-09-30	$10,062	252	-75.6%	Shares	Sole	2024-11-08
2023-09-30	$30,649	1,033	-33.1%	Shares	Sole	2023-11-01
2023-06-30	$59,382	1,544	-19.0%	Shares	Sole	2023-08-04
2022-12-31	$63,183	1,906	-49.5%	Shares	Sole	2023-02-02
2022-09-30	$97,232	3,776	+38.4%	Shares	Sole	2022-11-04
2022-03-31	$115,639	2,728	+252.5%	Shares	Sole	2022-05-02
2021-12-31	$44,396	774	-79.3%	Shares	Sole	2022-02-23
2021-03-31	$217,533	3,748	+339.9%	Shares	Sole	2021-04-26
2020-06-30	$19,280	852	—	Shares	Sole	2020-07-13
No filing history on record for this holder in this stock.