| Hudson Technologies | HDSN |
| Covanta Holding | CVA |
| Industrial Services Of America | IDSA |
| Heritage Crystal Clean | HCCI |
| Stericycle | SRCL |
| Waste Management | WM |
| Us Ecology | ECOL |
| Republic Services | RSG |
| Perma Fix Environmental Services | PESI |
| Taronis Technologies | MNGA |
| Evoqua Water Technologies | AQUA |
| Clean Harbors | CLH |
| Casella Waste Systems | CWST |
| Advanced Disposal Services | ADSW |
| Appliance Recycling Centers Of America (Minnesota) | ARCI |
| Ecology & Environment | EEI |
| Pacific Green Technologies | PGTK |
| Axim Biotechnologies | AXIM |
| Strategic Environmental & Energy Resources | SENR |
| Gly Eco | GLYE |
| Charah Solutions | CHRA |
| Tetra Tech | TTEK |
| Sharps Compliance | SMED |
| E Waste | EWST |
| General Environmental Management | GEVI |
| International Power Group Ltd. | IPWG |
| N Viro International | NVIC |
| Precicion Trim | PRTR |