| 1 | Calgon Carbon Corporation | USA | 1942 | Water treatment equipment, diatomaceous earth and perlite, granular activated carbon |
| 2 | Jacobi Carbons AB | Sweden | 1916 | Filters, ion exchange resins, activated carbon |
| 3 | General Carbon Corporation | USA | 1964 | Adsorption equipment, activated carbon, regenerated activated carbon |
| 4 | CarboTech AC GmbH | Germany | 1956 | Carbon molecular sieve, activated coke, activated carbon |
| 5 | Cabot Corporation | USA | 1882 | Aerogels, battery materials, advanced carbon materials, inkjet colorants |
| 6 | Eurocarb | U.K. | 1986 | Coconut shell, wood, coal-based AC |
| 7 | Haycarb PLC | Sri Lanka | 1973 | Coconut shell activated carbon |
| 8 | Donau Chemie Group | Germany | 1828 | Inorganic chemicals, water treatment, chemical distribution, activated carbon |
| 9 | Norit (Cabot Norit Activated Carbon) | Netherlands | 1916 | Filtration equipment, sodium lauryl sulfate, activated carbon, regenerated carbon |
| 10 | Heycarbons | China | 2005 | Coal, wood, coconut shell activated carbon |
| 11 | Donau Carbon GmbH | Germany | 1922 | Mobile adsorber, coconut shell activated carbon |
| 12 | Bioconservacion SA | Spain | 1996 | Chemical filtration media, filters, equipment |
| 13 | CPL Activated Carbons | U.K. | 1990 | Filters, regenerated carbon, activated carbon |
| 14 | ADA-ES, Inc. | USA | 1997 | Additives, Colloidal Carbon Products, GAC, PAC |
| 15 | Kuraray Co. Ltd. | Japan | 1926 | Resins, chemicals, fibers, functional materials |
| 16 | Carbon Activated Corporation | USA | 1993 | Filter, activated carbon |
| 17 | Evoqua Water Technologies LLC | USA | 2013 | Water Treatment, Filters, Dosing Chemicals, Carbon and Resins |
| 18 | Ingevity Corporation | USA | 2015 | Adhesive additives, resins, wood activated carbon, emulsifiers |
| 19 | Silcarbon Aktivkohle GmbH | Germany | 1999 | Molecular sieve, filter, coconut shell AC, regenerated carbon |
| 20 | Oxbow Activated Carbon LLC | USA | 1983 | Natural gas, oil, calcined coke, coal |
| 21 | CarbUSA LLC | USA | 2014 | Coconut shell, wood, coal-based activated carbon |
| 22 | Activated Carbon Technologies Pty Ltd | Australia | 2003 | Anthracite, Powdered Activated Carbon, Granular Activated Carbon |
| 23 | Carbon Resources LLC | India | 1991 | Carbon Electrode Paste, Tamping Paste, Calcined Petroleum Coke, Anthracite Coal |
| 24 | Sorbent Technologies, Inc. | USA | 2000 | Adsorbents, activated alumina, syringe filters, gel filtration resins |
| 25 | Desotec Activated Carbon | Belgium | 1990 | Mobile activated carbon filter |
| 26 | Puragen Activated Carbons | USA | 1997 | Equipment, bone char, activated carbon, EQUIPMENT, BONE CHAR |
| 27 | Ecologix Environmental Systems | USA | 2001 | Filters, Sludge Dewatering, Oil/Water Separators, Activated Glass Filter Media, AC |
| 28 | Global Activated Carbon | India | 1999 | activated alumina, activated bleaching, anthracite, manganese dioxide, molecular sieve, activated carbon |
| 29 | Philippine-Japan Active Carbon Corporation | Japan | 1972 | Metal catalyst carrier, coconut shell activated carbon |
| 30 | Veolia Water Technologies | USA | 1957 | Water,gas treatment unit, grease decomposition tank, sludge thickener |
| 31 | Alcarbon Corporation | Panama | 2009 | Charcoal, charcoal ash |
| 32 | AquaCarb | USA | 2023 | Water treatment and related products |
| 33 | Asbury Carbons | USA | 1895 | Graphite, coal, coke, carbon materials |
| 34 | Clarimex Group | Mexico | 1960 | Ion exchange resin, zeolite, anthracite, double oxide, AC |
| 35 | Kalimati Carbon | India | 2013 | Filter, Organic Coconut Shell Activated Carbon |
| 36 | Shinkwang Chem. Ind. Co., Ltd. | South Korea | 1985 | Air activated carbon, water activated carbon |
| 37 | Newterra | USA | 1977 | Deaerator, AC adsorber, rainwater purifier |
| 38 | Universal Carbons (India) Pvt. Ltd. | India | 1970 | Pine tar, bituminous coal activated carbon, steam,pine wood activated carbon |
| 39 | Auro Carbon & Chemicals | India | 1976 | Activated carbon fiber, activated carbon powder, activated carbon granules |
| 40 | Boyce Carbon | India | 2005 | Powdered activated carbon, granular activated carbon |
| 41 | Chemviron Carbon | Belgium | 1942 | Carbon Filters, Filter Aids, Activated Carbon |
| 42 | Kowa India Pvt. Ltd. | India | 1894 | Food, shipbuilding machinery, chemicals, processing, activated carbon |
| 43 | Industrial Water Equipment | U.K. | 2005 | Water filter, equipment, manganese dioxide, anthracite, activated carbon |
| 44 | Aquacover Ltd | U.K. | 2000 | Water softener, water filter, reverse osmosis system, ion exchange resin, activated carbon |
| 45 | AdFiS | Germany | 2006 | Filters, carbonate, activated carbon |
| 46 | Kurt Obermeier GmbH | Germany | 1948 | Emulsifier, ion exchanger, defoamer, activated carbon |
| 47 | Karbonous Inc. | USA | 2008 | Carbon filter,, lightweight filter, lignite catalytic activated carbon |
| 48 | Carbon Solutions, LLC | USA | 2002 | Bituminous coal, sub-bituminous coal, coconut shell, activated carbon |
| 49 | American Activated Carbon | USA | 2011 | Bituminous coal, acid washed bituminous coal activated carbon |
| 50 | Activated Carbon Solutions Inc. | USA | 2015 | Wood, coconut shell, coal-based activated carbon |