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Micro Cap
Pollution & Treatment Controls
Stocks Ranked by
Market Capitalization

Name Market cap Price Price
change %
ARQ icon
1
Arq
ARQ
$85.4M
$85.4M $1.99 1.97%
FTEK icon
2
Fuel Tech
FTEK
$47.4M
$47.4M $1.52 1.94%
SCWO icon
3
374Water
SCWO
$38.5M
$38.5M $2.20 1.85%
CLIR icon
4
ClearSign Technologies
CLIR
$25.1M
$25.1M $3.98 14%
LIQT icon
5
LiqTech
LIQT
$22.4M
$22.4M $0.6799 4.31%
RAIN
6
Rain Enhancement Technologies
RAIN
$13.5M
$13.5M $1.30 11%
TOMZ icon
7
TOMI Environmental Solutions
TOMZ
$12.9M
$12.9M $1.67 8.44%
CLWT icon
8
Euro Tech Holdings
CLWT
$11.7M
$11.7M $1.58 0.64%

Micro Cap Pollution & Treatment Controls Stocks at a Glance

Pollution and treatment control companies build filtration, emissions-control, waste-treatment, and recycling equipment. Environmental regulation drives demand — tightening standards create replacement and upgrade cycles largely independent of the economy.

There are 8 micro cap Pollution & Treatment Controls stocks — companies in the Pollution & Treatment Controls industry with a market cap under $250M — worth a combined $257M.

The largest by market cap are Arq (ARQ) at $85.4M, Fuel Tech (FTEK) at $47.4M and 374Water (SCWO) at $38.5M.

Among institutional investors, Rain Enhancement Technologies (RAIN) drew the most net new fund positions in Q1 2026: 8 funds opened new positions, taking total fund holders up 4 (31%) quarter-over-quarter.

Market caps and prices updated daily; fund activity based on aggregated SEC 13F filings for Q1 2026.