GROUP ONE TRADING LLC

Position in ARQ — Arq, Inc.

CIK 932540 CHICAGO, IL

Position in ARQ

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

Position Value

$16,873

-$45,305 QoQ

Shares Held

6,617

-55.6% QoQ

Ownership

0.015%

of shares outstanding

% of Portfolio

0.00%

of 13F equity value

Holder Rank

#71

of 100 holders

Holding Since

Dec 2021

13 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Industrials · as of Jun 30, 2026

GROUP ONE TRADING LLC holds $345,459 across 8 Pollution & Treatment Controls names. ARQ ranks #5 (4.9% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	ERII	Energy Recovery, Inc.	21,778	$196,437
2	ADUR	Aduro Clean Technologies Inc.	3,506	$55,254
3	VLTO	Veralto Corp	400	$35,472
4	FTEK	Fuel Tech, Inc.	13,903	$30,725
5	ARQ	Arq, Inc. This page	6,617	$16,873
6	ZWS	Zurn Elkay Water Solutions Corp	211	$10,661
7	CLIR	ClearSign Technologies Corp	9	$33
8	LIQT	Liqtech International Inc	5	$4

13 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$16,873	6,617	-55.6%	Shares	Sole	2026-08-14
2025-03-31	$62,178	14,911	-31.0%	Shares	Sole	2025-05-14
2024-12-31	$163,595	21,611	+31.6%	Shares	Sole	2025-05-14
2024-09-30	$96,414	16,425	+345.1%	Shares	Sole	2024-11-14
2024-03-31	$23,911	3,690	-32.8%	Shares	Sole	2024-05-10
2023-12-31	$16,360	5,490	+594.9%	Shares	Sole	2024-02-14
2023-09-30	$1,406	790	+13.2%	Shares	Sole	2023-11-09
2023-03-31	$1,382	698	+134.2%	Shares	Sole	2023-05-12
2022-12-31	$724	298	-95.9%	Shares	Sole	2023-02-09
2022-09-30	$19,806	7,255	+229.8%	Shares	Sole	2022-11-09
2022-06-30	$10,318	2,200	+15.8%	Shares	Sole	2022-08-11
2022-03-31	$11,818	1,900	-54.8%	Shares	Sole	2022-05-12
2021-12-31	$27,804	4,200	—	Shares	Sole	2022-02-11
No filing history on record for this holder in this stock.