1. Biffa
2. Casella Waste Systems Inc.
3. Clean Harbors Inc.
4. Covanta Holding Corporation
5. Custom Polymers Inc.
6. HAHN Plastics Ltd.
7. Krubong-Karich Group
8. Luxus Limited
9. Plastic Energy
10. REMONDIS SE & Co. KG
11. Repeat Plastics Australia Pty Ltd.
12. Republic Services Inc.
13. Stericycle Inc.
14. Veolia
15. Waste Connections Inc.