Sharps Compliance Corp.
Estre Ambiental, Inc.
Hudson Technologies, Inc.
Vertex Energy, Inc.
Perma-Fix Environmental Services, Inc.
Clean Harbors, Inc.
Republic Services, Inc.
Avalon Holdings Corp.
Covanta Holding Corp.
Tetra Tech, Inc.
Ecology & Environment, Inc.
US Ecology, Inc.
Casella Waste Systems, Inc.
Quest Resource Holding Corp.
Attis Industries, Inc.
Aqua Metals, Inc.
Advanced Disposal Services, Inc.
Waste Management, Inc.
Appliance Recycling Centers of America, Inc. (Minnesota)
Charah Solutions, Inc.
Industrial Services of America, Inc.
Taronis Technologies, Inc.
NRC Group Holdings Corp.
Estre Ambiental, Inc.
Attis Industries, Inc.
Heritage-Crystal Clean, Inc.
Waste Connections, Inc.
NRC Group Holdings Corp.
Evoqua Water Technologies Corp.
JanOne, Inc.
US Ecology, Inc.
