| Client name | City | Country |
|---|---|---|
| China Steel Corporation | Hsiag Kang, Kaoshiung | Taiwan, Province of China |
| Chiyoda Corporation | Yokohama | Japan |
| Chongqing Chuanyi Automation Co., Ltd. | 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 |
| CIRCOR Energy Headquarters | Houston | United States |
| Clariant Produkte (Deutschland) GmbH | Burgkirchen | Germany |
| Clariant Produkte (Deutschland) GmbH | Sulzbach | Germany |
| Clariant Produkte (Deutschland) GmbH | Oberhausen | Germany |
| Clariant Produkte (Schweiz) AG | Muttenz 1 | Switzerland |
| Clarke Valve | Newport | United States |
| CMR Group HQ | Marseille Cedex 13 | France |
| CNOOC and Shell Petrochemicals Company (CSPC-OSBL) | Beijing | China |
| Colors & Effects USA LLC | Cincinnati | United States |
| Comfit and Valves Private Ltd. | Mahesana | India |
| Compania Electrica de Sochagota S.A. E.S.P. | Paipa | Colombia |
| Comtec-energoservise LLC | Saint-Petersburg | Russian Federation |
| Coneleex LLC | Houston | United States |
| CONFLOW s.p.a. | Agrate Brianza | Italy |
| ConPackSys | Dordrecht | Netherlands |
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