- m2r Ltd
- MadiganGill Ltd
- Madison Browne International
- Magnito
- Manpower
- Manpower Business Services
- Manpower Uk Ltd
- Mansfield Sales Recruitment
- Match Recruitment UK Ltd
- Maven Management Limited
- MerlinCorp PLC
- Merritt & Baker Consultancy Ltd
- Meze management
- MIA Recruitment Solutions
- Microscape Recruitment Ltd