- Club Med
- CMC Netherlands B.V.
- CMS DISTRIBUTION LIMITED
- CNS Media Group
- Coachademy
- Coca-Cola
- Coca-Cola Enterprises
- Coconix BV
- CodeGuild
- Coffreo S.A.S.
- Cognex
- Colder Products Company GmbH
- Colt Technologies
- Colt Technology
- Colt Technology Services NV
- Comarch
- Comdata Group Nederland
- Comforce
- Comfylife
- Commissioning Agents Ireland Ltd
- CommScope
- Communicaid
- CompaNanny
- Company test
- Competa IT
- Compusult Europe B.V.
- Computens
- comScore
- Concentrix
- Concentrix Global Services GmbH
- concertare Beratungs- und Dienstleistungsgesellschaft mbH
- concr3de
- Concy NL
- CONG
- Congreve Recruitment Limited
- Conjoint Analysis B.V
- Connecting Green Markets
- Considerati
- ConSol Partners
- Constellate
- Content Guru
- ContiTech Belgium BVBA
- CONTROLLEDTST -- Do not use --
- Converge
- Convergys International Europe
- Converse Deutschland GmbH
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