| Client name | City | Country |
|---|---|---|
| Bürkert GmbH & Co.KG | München | Germany |
| Burkert Schweiz AG | Hünenberg | Switzerland |
| Bürkert Werke GmbH & Co. KG | Ingelfingen | Germany |
| BVALVE, FLOW SYSTEMS & CONTROLS, SLU | El Puig (Valencia) | Spain |
| 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 |
| CAC ENGINEERING GMBH | Chemnitz | 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 |