| Client name | City | Country |
|---|---|---|
| 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 |
| Citec Engineering & Information GmbH | Oberursel | Germany |
| 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 | North Kingstown, RI | United States |
| CMR Group HQ | Marseille Cedex 13 | France |
| CNOOC and Shell Petrochemicals Company (CSPC-OSBL) | Beijing | China |
| Colors & Effects USA LLC | Cincinnati, OH 45217 | 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 TX, 77056 | United States |
| CONFLOW s.p.a. | Agrate Brianza (MI) | Italy |
| ConPackSys | Dordrecht | Netherlands |
| Continental Valves Limited | Sohna, Gurgaon | India |
| Control Valves UK Ltd. | Wigan | United Kingdom |
| Coperion Ideal Pvt. Ltd. | Noida | India |
| Cordenka GmbH & Co. KG | Obernburg | Germany |
| Corlido Procurement Services b.v. | Emmen | Netherlands |
| Corporate Solutions | Voest | Belgium |
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