| NHS Arden & Greater East Midlands CSU | Leicester | 1 | 1 |
| Dell Corporation | Bracknell, Bracknell Forest | 15 | 95 |
| Insight Direct | Sheffield | 3 | 121 |
| Specsavers Hearcare Group | La Villiaze, St Andrews | 2 | 2 |
| Palantir Technologies | London, Company Number | 2 | 2 |
| Physiological Measurements | Shropshire, Oswestry | 2 | 2 |
| Practice Plus Group | Reading | 2 | 2 |
| European Electronique | Witney | 4 | 34 |
| Mediscan Diagnostic Services | Denton | 3 | 3 |
| Softcat | Marlow | 2 | 176 |
| KPMG | London | 2 | 102 |
| Ernst & Young | London | 2 | 89 |
| Bytes Software Services | Leatherhead | 2 | 70 |
| PA Consulting | London | 2 | 4 |
| Create Health | London | 2 | 4 |
| Complete Price Eyewear | Swindon | 2 | 3 |
| Inhealth | High Wycombe | 2 | 3 |
| Modality | Birmingham | 2 | 2 |
| Coyle Personnel | Harrow | 2 | 2 |
| Scrivens | Birmingham | 2 | 2 |
| Computacenter | Hatfield | 1 | 118 |
| Gartner | Egham | 1 | 26 |
| BDO | London | 1 | 32 |
| Virgin Media Business | Reading | 1 | 21 |
| Tiaa | Fareham | 1 | 14 |
| Solent NHS Trust | Southampton | 1 | 13 |
| Gatenbysanderson | Leeds | 1 | 11 |
| QA Limited | Slough | 1 | 12 |
| Exponential E | London | 1 | 8 |
| Bechtle Direct | Chippenham | 1 | 8 |
| Akhter Computers | Harlow | 1 | 15 |
| Capsticks Solicitors | London | 1 | 6 |
| Valorum Care | Manchester | 1 | 11 |
| Marie Stopes | London | 1 | 7 |
| Primary Eyecare Services | Manchester | 1 | 6 |
| Nuffield Health | Epsom | 1 | 5 |
| Insight Direct Services | Hillingdon | 1 | 7 |
| Mason Advisory | Westminster | 1 | 7 |
| Alliance Medical | Warwick | 1 | 4 |
| Industrial Diagnostics | Leicester | 1 | 5 |
| Camden & Islington NHS Trust | London | 1 | 4 |
| Alpha Health Care | London | 1 | 22 |
| Our Health Partnership | Birmingham | 1 | 6 |
| Walsall Healthcare NHS Trust | Walsall | 1 | 4 |
| Leeds & York Partnership NHS Trust | Leeds | 1 | 4 |
| Cisilion | Mole Valley | 1 | 3 |
| Wavenet | West Midlands | 1 | 3 |
| Specsavers Optical Superstores | Fareham | 1 | 5 |
| Aspen Healthcare | London | 1 | 3 |
| Healthharmonie | Birmingham | 1 | 3 |
| Lincolnshire Partnership NHS Trust | Sleaford | 1 | 3 |
| South Warwickshire NHS Trust | Warwick | 1 | 3 |
| Spamedica | Bolton | 1 | 3 |
| Birmingham Community Healthcare NHS Trust | Birmingham | 1 | 2 |
| Coventry & Warwickshire Partnership NHS Trust | Wilsons Lane Coventry | 1 | 2 |
| Fairfield Independent Hospital | Merseyside | 1 | 2 |
| Hertfordshire Community NHS Trust | Welwyn Garden City | 1 | 2 |
| Horder Healthcare | Crowborough | 1 | 2 |
| Kims Hospital | Maidstone | 1 | 2 |
| PA Consulting Group | London | 1 | 2 |
| Ramsay Health Care UK Operations | London | 1 | 2 |
| Source Bioscience | Nottingham | 1 | 2 |
| Tmi Systems | Bracknell | 1 | 2 |
| Vaccination | Hitchin | 1 | 2 |
| Absolute Care Homes Central | | 1 | 2 |
| Absolute Health Care Central | | 1 | 2 |
| Amaanah Medical Practice | Birmingham | 1 | 2 |
| Bourn Bioscience | Cambridge | 1 | 2 |
| DR Shabana Rahman | Birmingham | 1 | 2 |
| Goldthorn Lodge | Dudley | 1 | 2 |
| Jaffray Care Society | Birmingham | 1 | 2 |
| Practice Surgeries | Little Chalfont | 1 | 2 |
| Shaw Foundation | Cardiff | 1 | 2 |
| Superior Care Midlands | Birmingham | 1 | 2 |
| Hewlett Packard | Reading | 1 | 5 |
| Medinet Clinical Services | Sutton Coldfield | 1 | 2 |
| Remedy Healthcare Solutions | Greater London | 1 | 2 |
| Somerset Surgical Services | Newcastle upon Tyne | 1 | 2 |
| 4Ways Healthcare | Hemel Hempstead | 1 | 1 |
| Anaplan | Maidenhead | 1 | 1 |
| Beacon Medical Services Group | Manchester | 1 | 1 |
| Boston Hale | London | 1 | 1 |
| Broadcare Software | West Midlands | 1 | 1 |
| Cambridge & Peterborough Trust | Cambridge | 1 | 1 |
| Cambridge University Hospitals NHS Trust | Cambridge | 1 | 1 |
| Care Fertility | Nottingham | 1 | 1 |
| Carnall Farrar | London | 1 | 1 |
| Centre for Sight | East Grinstead | 1 | 1 |
| Claire Cairns Associates | Brough | 1 | 1 |
| Cobalt Unit Appeal Fund | Cheltenham | 1 | 1 |
| Cordis Bright | London | 1 | 1 |
| Dermatology Partnership | Oxford | 1 | 1 |
| Diagnostic World | Birmingham | 1 | 1 |
| Emms | Nottingham | 1 | 1 |
| Epsomedical | Cobham | 1 | 1 |
| Essex Ophthalmology Essex Vision | Hornchurch | 1 | 1 |
| Essex Partnership University NHS FT | Runwell | 1 | 1 |
| in Form Solutions | Lichfield | 1 | 1 |
| Fortius London | London | 1 | 1 |
| GP Care | Bristol | 1 | 1 |