Round Rock Advisors LLC

Position in CECO — Ceco Environmental Corp

CIK 1846991 WILTON, CT

Position in CECO

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

Position Value

$233,613

-$421,744 QoQ

Shares Held

3,921

-64.2% QoQ

Ownership

0.011%

of shares outstanding

% of Portfolio

0.08%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Dec 2025

2 quarters on record

Voting authority Sole 99% Shared 0% None 1%

Industrials · as of Mar 31, 2026

Round Rock Advisors LLC holds $773,725 across 3 Pollution & Treatment Controls names. CECO ranks #2 (30.2% of the industry book) .

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

2 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$233,613	3,921	-64.2%	Shares	Sole	2026-05-15
2025-12-31	$655,357	10,950	—	Shares	Sole	2026-04-07
No filing history on record for this holder in this stock.