Micro Cap
Pollution & Treatment Controls
Stocks Ranked by
Market Capitalization
| Name | Market cap | Price |
Price change % |
|
|---|---|---|---|---|
1
Arq
ARQ
$85.4M
| $85.4M | $1.99 | 1.97% |
|
2
Fuel Tech
FTEK
$47.4M
| $47.4M | $1.52 | 1.94% |
|
3
374Water
SCWO
$38.5M
| $38.5M | $2.20 | 1.85% |
|
4
ClearSign Technologies
CLIR
$25.1M
| $25.1M | $3.98 | 14% |
|
5
LiqTech
LIQT
$22.4M
| $22.4M | $0.6799 | 4.31% |
|
|
RAIN
6
Rain Enhancement Technologies
RAIN
$13.5M
| $13.5M | $1.30 | 11% |
|
7
TOMI Environmental Solutions
TOMZ
$12.9M
| $12.9M | $1.67 | 8.44% |
|
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.
- Combined market cap: $257M across 8 stocks.
- Micro Cap: market cap under $250M.
- Largest constituent: Arq (ARQ), $85.4M market cap.
- Most net new fund positions in Q1 2026: Rain Enhancement Technologies (RAIN), +4 holders.
Market caps and prices updated daily; fund activity based on aggregated SEC 13F filings for Q1 2026.