- Sustainable Marine Technologies
- SVC Group
- Swan IT Recruitment Ltd
- SwanIT Recruitment
- Swarovski
- Swift Personnel Limited
- Swift Selection
- Swissport GB Ltd
- SWR Energy
- Synchronised Solution
- Synergi Search & Select Ltd
- Syntech Recruitment
- Syntony (Search and Selection) Ltd
- System Recruitment
- System Recruitment Ltd
