GROUP ONE TRADING LLC

Position in FTEK — Fuel Tech, Inc.

CIK 932540 CHICAGO, IL

Position in FTEK

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

Position Value

$30,725

-$18,337 QoQ

Shares Held

13,903

-65.4% QoQ

Ownership

0.045%

of shares outstanding

% of Portfolio

0.00%

of 13F equity value

Holder Rank

#23

of 42 holders

Holding Since

Mar 2020

14 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. FTEK ranks #4 (8.9% 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. This page	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	9	$33
8	LIQT	Liqtech International Inc	5	$4

14 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$30,725	13,903	-65.4%	Shares	Sole	2026-08-14
2026-03-31	$49,062	40,215	-5.4%	Shares	Sole	2026-05-13
2025-12-31	$66,314	42,509	+40.7%	Shares	Sole	2026-02-12
2025-09-30	$90,618	30,206	+71.2%	Shares	Sole	2025-11-12
2025-03-31	$18,520	17,639	+13262.9%	Shares	Sole	2025-05-14
2024-09-30	$138	132	-99.1%	Shares	Sole	2024-11-14
2022-03-31	$21,306	14,694	-32.9%	Shares	Sole	2022-05-12
2021-12-31	$30,651	21,894	+73.3%	Shares	Sole	2022-02-11
2021-09-30	$21,986	12,636	-40.0%	Shares	Sole	2021-11-12
2021-06-30	$49,500	21,064	-20.6%	Shares	Sole	2021-08-10
2021-03-31	$83,338	26,541	+16385.1%	Shares	Sole	2021-05-12
2020-09-30	$135	161	0.0%	Shares	Sole	2020-11-12
2020-06-30	$135	161	0.0%	Shares	Sole	2020-08-13
2020-03-31	$64	161	—	Shares	Sole	2020-05-13
No filing history on record for this holder in this stock.