| Client name | City | Country |
|---|---|---|
| Celanese Singapore Pte Ltd | Singapur | Singapore |
| CEP Studio | General Lagos | Argentina |
| CERA SYSTEM Verschleißschutz GmbH | Mülheim (Ruhr) | Germany |
| CERA SYSTEM Verschleißschutz GmbH | Hermsdorf | Germany |
| CEZ ICT Services, a. s. | Plzen | Czech Republic |
| CEZ ICT Services, a. s. | Praha 2 | Czech Republic |
| CEZERI AKISKAN TEKNOLOJILERI A.S | Üsküdar/Istanbul | Turkey |
| Chemgineering Switzerland AG | Münchenstein | Switzerland |
| Chemieanlagenbau Chemnitz GmbH | Chemnitz | Germany |
| Chemische Fabrik Kalk GmbH | Köln | Germany |
| Chengde Rehe - KROHNE Meters Co., Ltd | Chengde | China |
| Chennai Petroleum Corporation Ltd. (CPCL) | Chennai | India |
| Chevron Phillips Chemical Company LP | Baytown | United States |
| ChevronPhillips Chemicals Pasadena Plastics Complex (PCC) | Pasadena, TX | United States |
| China Huanqiu Contracting & Engineering Co., LTD | Beijing | China |
| China Kunlun Contracting & Engineering Corporation | Beijing | China |
| China Steel Corporation | Hsiag Kang, Kaoshiung | Taiwan, Province of China |
| Chongqing Chuanyi control valve manufacturer | Chongqing | China |
| CHOREN Industries GmbH | Freiberg | Germany |
| CHOREN Industrietechnik GmbH | Dresden | Germany |
| Chr. Hansen GmbH | Nienburg | Germany |
| Christian Bürkert GmbH & Co.KG | Leinfelden-Echterdingen | Germany |
| Ciba Spezialitäten Chemie Grenzach GmbH | Grenzach-Wyhlen | Germany |
| Ciba-Additive GmbH | Lampertheim | Germany |
| CIMTech International Ltd. | Stockton, Cleveland TS16 9BT | United Kingdom |
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