| Atos IT Services | London, High Holborn, Greater London | 42 | 29 |
| Atos Origin IT Services | London | 1 | 1 |
| Deloitte | London | 6 | 122 |
| Insight Direct | Sheffield, Uxbridge | 5 | 121 |
| NHS Shared Business Services | Hemel Hempstead, Hertfordshire, Salford | 4 | 5 |
| Softcat | Marlow | 4 | 176 |
| Bramble Hub | London | 4 | 18 |
| CGI IT | London, Reading | 4 | 21 |
| Fujitsu Services | London, Westminster | 4 | 12 |
| Awtg | London | 4 | 4 |
| Cloudthing | Stourbridge, West Midlands | 4 | 4 |
| Civica | London, Altrincham | 3 | 86 |
| Specialist Computer Centres | Birmingham | 3 | 122 |
| Advanced Business Software & Solutions | Berkshire, Slough | 3 | 6 |
| Phoenix Software | Surrey, York | 2 | 93 |
| Capita Business Services | London | 2 | 121 |
| Oracle Corporation | Reading | 2 | 33 |
| Methods Business & Digital Technology | London | 2 | 40 |
| Sap | Feltham, Hounslow | 2 | 15 |
| Risual | Stafford | 2 | 10 |
| Iron Mountain | London | 2 | 7 |
| Workday | County Dublin, Dublin | 2 | 8 |
| Tisski | Sheffield | 2 | 6 |
| Boxxe | York, Sutton on the Forest | 2 | 7 |
| Agilisys | London | 2 | 7 |
| Netcompany | London, Islington | 2 | 6 |
| Kainos Worksmart | Belfast | 2 | 5 |
| Bravosolution | London | 2 | 4 |
| Goss Interactive | Darklake View, Plymouth | 2 | 4 |
| Sopra Steria | Hemel Hempstead | 2 | 4 |
| Tata Consultancy Services | London | 2 | 4 |
| Capita Secure Information Solutions | London | 2 | 3 |
| Answer Digital | Leeds | 2 | 4 |
| Apira | London, Greater London | 2 | 2 |
| Nautilus Consulting | London | 2 | 2 |
| Synapps Solutions | Hatfield, Watford | 2 | 2 |
| Ib Boost | London | 2 | 2 |
| Shared Services Connected | Hemel Hempstead | 2 | 2 |
| Capita Ess | London | 2 | 2 |
| Ehj SJ Consultancy | Aylesbury | 2 | 2 |
| Faculty of Clinical Informatics | London | 2 | 2 |
| Fordway Solutions | Godalming | 2 | 2 |
| Health Systems Support | Surrey, Chobham | 2 | 2 |
| Huawei Technologies | Huawei Technologies Uk Ltd, Reading | 2 | 2 |
| Ideal Health Consultants | Surrey, Guildford | 2 | 2 |
| Jadu Creative | Enderby | 2 | 2 |
| Palantir Technologies | London | 2 | 2 |
| Pegasystems | Reading | 2 | 2 |
| Quantiq Technology | London | 2 | 2 |
| Redcortex | Cardiff | 2 | 2 |
| Solidsoft Reply | London, Basingstoke | 2 | 2 |
| Startraq | Banbury | 2 | 2 |
| XMA | Nottingham | 2 | 93 |
| Ernst & Young | London | 2 | 89 |
| Dell Corporation | Bracknell | 2 | 95 |
| Accenture | London | 2 | 30 |
| Stone Computers | Stafford | 2 | 24 |
| Logicalis | Slough | 2 | 13 |
| Engine Partners | London | 2 | 23 |
| Q Associates | Newbury | 2 | 10 |
| HCL Technologies | Surrey | 2 | 8 |
| Ocf | Sheffield | 2 | 4 |
| Fujitsu | London | 2 | 4 |
| Ceox Services | Berkshire | 2 | 2 |
| Evolutionary Systems | North Harrow | 2 | 2 |
| Hewlett Packard | Bracknell | 2 | 5 |
| Entserv | Aldershot | 2 | 4 |
| Bedigital | Cardiff | 2 | 2 |
| Aryaa Associates | London | 2 | 2 |
| Cadmidium Services | Gloucestershire | 2 | 2 |
| Civica Digital A Division of Civica | London | 2 | 2 |
| Clustervision | London | 2 | 2 |
| Cognizant Technology Solutions | London | 2 | 2 |
| Covoxa | Winchester | 2 | 2 |
| Eappsys | Brentford | 2 | 2 |
| Equiniti | Belfast | 2 | 2 |
| Lenovo Technology | Hook | 2 | 2 |
| Mcsa Group | High Wycombe | 2 | 2 |
| Netapp | Uxbridge | 2 | 2 |
| Techtrade International Holdings | Godalming | 2 | 2 |
| CDW | London | 1 | 71 |
| Pricewaterhousecoopers | London | 1 | 75 |
| Mott Macdonald | Croydon | 1 | 60 |
| Capgemini | Surrey | 1 | 36 |
| CSC Computer Sciences | Aldershot | 1 | 22 |
| Cognizant Worldwide | London | 1 | 18 |
| GE Medical Systems | Chalfont St Giles | 1 | 13 |
| Ecorys | London | 1 | 10 |
| ICF Consulting Services | London | 1 | 8 |
| Egton Medical Information Systems | Yeadon | 1 | 8 |
| System C Healthcare | Warwick | 1 | 5 |
| Advanced Health & Care | Ashford | 1 | 4 |
| Ideagen | Matlock | 1 | 4 |
| Palladium | London | 1 | 11 |
| Agfa Healthcare | Brentford | 1 | 4 |
| Clevermed | Edinburgh | 1 | 3 |
| Servelec Healthcare | Sheffield | 1 | 3 |
| DAI Global | Apsley | 1 | 4 |
| Integrity Research & Consultancy | London | 1 | 4 |
| IMC Worldwide | Surrey | 1 | 3 |