| Client name | City | Country |
|---|---|---|
| C+E Forum AG | Dübendorf ZH | Switzerland |
| C.F. Scheer & Cie. GmbH + Co. | Stuttgart | Germany |
| C.H. Zikesch Armaturentechnik GmbH | Essen | Germany |
| C.P.C. - Control(ing) Product Concept | Cordemais | France |
| CABB GmbH | Gersthofen | Germany |
| CABOT GmbH | Rheinfelden | Germany |
| CADtech Consultants Private Ltd. | New Delhi | India |
| Çalik Enerji | Zincirlikuyu–Sisli / Istanbul | Turkey |
| Callidus Process Solutions Pty Ltd | Balcatta | Australia |
| Caloric Anlagenbau GmbH | Gräfelfing | Germany |
| CAMERON MFG. (INDIA) PRIVATE LTD. | Coimbatore | India |
| Candu Energy Inc. | Mississauga | Canada |
| Carbon Black Nederland B.V. | Botlek | Netherlands |
| Cargill b.v. | Sas van Gent | Netherlands |
| Cargill BV | Schiphol | Netherlands |
| Cargill Deutschland GmbH | Krefeld | Germany |
| CARGILL Deutschland GmbH | Barby | Germany |
| Carl Freudenberg | Laudenbach | Germany |
| Carl Lösch Filter GmbH | Kempenich | Germany |
| Carmel Olefins Ltd. | Haifa | Israel |
| CASALE S.A. | Lugano | Switzerland |
| CCI Valve Technologie GmbH | Wien | Austria |
| Cegelec Services GmbH | Leverkusen | Germany |
| Celanese | Hamm | Germany |
| Celanese | Clear Lake | United States |
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