Perma-Fix Environmental Services, Inc. (PESI)
Perma-Fix Environmental Services, Inc., through its subsidiaries, operates as an environmental and technology know-how company in the United States.
Energy Recovery, Inc. (ERII)
Energy Recovery, Inc., together with its subsidiaries, designs, manufactures, and sells various solutions for the seawater reverse osmosis desalination and industrial wastewater treatment industries worldwide.
Euro Tech Holdings Company Limited (CLWT)
Euro Tech Holdings Company Limited primarily distributes water treatment equipment, laboratory instruments, analyzers, test kits and related supplies.