• Veolia Environnement S.A.
• EnviroServe (Savage Companies)
• Covanta Holding Corp. (EQT AB (PUBL))
• Waste Management Inc.
• Stericycle Inc.
• Daiseki Co. Ltd.
• Clean Harbors Inc.
• Remondis SE & Co. KG
• Republic Services Inc. (Cascade Investment Group Inc.)
• Sembcorp Industries (Temasek International Pte Ltd)