Round Rock Advisors LLC

Position in ARQ — Arq, Inc.

CIK 1846991 WILTON, CT

Position in ARQ

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$488,212

New position

Shares Held

190,708

first reported quarter

Ownership

0.444%

of shares outstanding

% of Portfolio

0.17%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2026

1 quarter on record

Voting authority Sole 100% Shared 0% None 0%

Industrials · as of Mar 31, 2026

Round Rock Advisors LLC holds $773,725 across 3 Pollution & Treatment Controls names. ARQ ranks #1 (63.1% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	ARQ	Arq, Inc. This page	190,708	$488,212
2	CECO	Ceco Environmental Corp	3,921	$233,613
3	PCT	PureCycle Technologies, Inc.	10,000	$51,900

1 filing row on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$488,212	190,708	—	Shares	Sole	2026-05-15
No filing history on record for this holder in this stock.