| Client name | City | Country |
|---|---|---|
| CASALE S.A. | Lugano | Switzerland |
| CCI Valve Technologie GmbH | Wien | Austria |
| Cegelec Services GmbH | Leverkusen | Germany |
| Celanese | Hamm | Germany |
| Celanese | Clear Lake | United States |
| Celanese International Corporation | Irving | United States |
| Celanese Nanjing Offices | China | |
| Celanese Production Germany GmbH & Co. KG | Sulzbach (Taunus) | Germany |
| Celanese Shanghai Offices | Shanghai | China |
| 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 |
| 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 | United States |
| China Chengda Engineering Co. Ltd. | Chengdu | China |
| China Huanqiu Contracting & Engineering Co., LTD | Beijing | China |
| China Kunlun Contracting & Engineering Corporation | Beijing | China |
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