- C2 Recruitment Ltd
- C2B Solutions UK
- Caleeda Ltd
- Call-In Homecare
- Callan Connect
- CallBrenda Staff Agents Ltd
- Callidus Resourcing Limited
- CAMBRA Recruitment
- Cambridge Network
- Cameo Consultancy (Recruitment) Limited
- Cameron Kennedy
- Campbell Taylor Recruitment
- Candidate Wizard
- Candy Recruitment
- Canon Europa NV