GROUP ONE TRADING LLC

Position in ACMR — ACM Research, Inc.

CIK 932540 CHICAGO, IL

Position in ACMR

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

Position Value

$19,928,835

+$16,331,183 QoQ

Shares Held

157,056

+71.8% QoQ

Ownership

0.225%

of shares outstanding

% of Portfolio

0.68%

of 13F equity value

Holder Rank

#57

of 374 holders

Holding Since

Sep 2020

14 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Technology · as of Jun 30, 2026

GROUP ONE TRADING LLC holds $52,564,758 across 15 Semiconductor Equipment & Materials names. ACMR ranks #1 (37.9% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	ACMR	ACM Research, Inc. This page	157,056	$19,928,835
2	AXTI	Axt Inc	168,015	$12,110,521
3	AMKR	Amkor Technology, Inc.	129,334	$11,152,470
4	TER	Teradyne, Inc	4,595	$2,223,244
5	KLAC	Kla Corp	6,218	$1,876,032
6	AEHR	Aehr Test Systems	17,271	$1,659,052
7	Q	Qnity Electronics, Inc.	6,699	$1,094,013
8	ATOM	Atomera Inc	73,496	$640,150

14 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$19,928,835	157,056	+71.8%	Shares	Sole	2026-08-14
2026-03-31	$3,597,652	91,427	-14.6%	Shares	Sole	2026-05-13
2025-12-31	$4,225,607	107,113	-21.2%	Shares	Sole	2026-02-12
2025-09-30	$5,316,045	135,856	+377.5%	Shares	Sole	2025-11-12
2025-06-30	$736,958	28,454	+19.8%	Shares	Sole	2025-08-14
2025-03-31	$554,161	23,743	-41.2%	Shares	Sole	2025-05-14
2024-12-31	$609,375	40,356	+215.4%	Shares	Sole	2025-05-14
2024-09-30	$259,758	12,796	+10.0%	Shares	Sole	2024-11-14
2024-06-30	$268,372	11,638	+134.1%	Shares	Sole	2024-08-14
2023-09-30	$90,018	4,972	-98.5%	Shares	Sole	2023-11-09
2022-03-31	$6,888,983	332,962	+875.0%	Shares	Sole	2022-05-12
2021-03-31	$2,759,059	34,151	+1242.9%	Shares	Sole	2021-05-12
2020-12-31	$206,618	2,543	-89.1%	Shares	Sole	2021-02-10
2020-09-30	$1,616,039	23,387	—	Shares	Sole	2020-11-12
No filing history on record for this holder in this stock.