- Cocoabean
- Cocoabean Recruitment
- Code Red Associates
- CognitionX
- Cohera Specialist Recruitment Group
- Colbern Limited
- Colbern Limited
- Colin Larter Recruitment Ltd
- Collabera
- Colmenar Engineering Agency
- Combers Ltd
- Comet Talent Limited
- Comity Recruitment Ltd
- Command Recruitment
- Commercial Consultants (UK) Ltd
- Commercial Consultants UK Ltd
- Company Fusion Limited
- Completely Care Ltd
- Computacenter
- Computer Recruiter
- Compuvac Personnel Services Ltd
- Concentrix
- Concept Appointments
- Concept Care Solutions
- Concept Resourcing
- Concept Staffing
- ConceptRT Ltd
- Condign Professional Services Limited
- ConeKta
- Connaught Education