GROUP ONE TRADING LLC

Position in CLIR — ClearSign Technologies Corp

CIK 932540 CHICAGO, IL

Position in CLIR

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

Position Value

$33

-$6 QoQ

Shares Held

0.0% QoQ

Ownership

0.000%

of shares outstanding

% of Portfolio

0.00%

of 13F equity value

Holder Rank

#25

of 25 holders

Holding Since

Dec 2020

12 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. CLIR ranks #7 (0.0% 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.	6,617	$16,873
6	ZWS	Zurn Elkay Water Solutions Corp	211	$10,661
7	CLIR	ClearSign Technologies Corp This page	9	$33
8	LIQT	Liqtech International Inc	5	$4

12 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$33	9	0.0%	Shares	Sole	2026-08-14
2026-03-31	$39	9	-99.6%	Shares	Sole	2026-05-13
2023-06-30	$2,678	2,045	0.0%	Shares	Sole	2023-08-09
2023-03-31	$1,636	2,045	0.0%	Shares	Sole	2023-05-12
2022-12-31	$1,104	2,045	-77.9%	Shares	Sole	2023-02-09
2022-09-30	$8,505	9,245	-22.0%	Shares	Sole	2022-11-09
2022-06-30	$14,337	11,849	-27.7%	Shares	Sole	2022-08-11
2022-03-31	$26,704	16,383	-47.7%	Shares	Sole	2022-05-12
2021-12-31	$43,260	31,348	+8372.4%	Shares	Sole	2022-02-11
2021-06-30	$1,776	370	-91.2%	Shares	Sole	2021-08-10
2021-03-31	$23,912	4,210	-91.0%	Shares	Sole	2021-05-12
2020-12-31	$136,470	46,577	—	Shares	Sole	2021-02-10
No filing history on record for this holder in this stock.