| Kantar | London, West Gate | 8 | 16 |
| Senator | Accrington, Syke Side Drive | 7 | 17 |
| Ipsos MORI | London | 7 | 55 |
| IFF Research | London | 5 | 29 |
| Wagstaff Bros | Islington, London | 4 | 7 |
| Yonder Consulting | London | 4 | 4 |
| Flexiform Business Furniture | Bradford | 3 | 9 |
| Equal Experts | London, Manchester | 3 | 12 |
| British Telecommunications | Dundee City, Southend-on-Sea | 2 | 26 |
| IBM | Redbridge, Portsmouth | 2 | 34 |
| Accenture | London | 2 | 30 |
| Shred Station | Broadland, Norwich | 2 | 9 |
| Fujitsu Services | Westminster, Bracknell Forest | 2 | 12 |
| KPMG Audit | Tower Hamlets | 2 | 10 |
| Makers Academy | London | 2 | 2 |
| Red Industries | Stoke on Trent, Newcastle under Lyme | 2 | 2 |
| Sonic Communications | West Midlands | 2 | 2 |
| William Alexander Consulting | Hove, Western Road Hove | 2 | 2 |
| Mapeley Steps Contractor | Watford | 8 | 8 |
| Bureau Van Dijk Electronic Publishing | London | 5 | 6 |
| Amazon Web Services Emea Sarl UK Branch | London | 3 | 3 |
| Deloitte | London | 2 | 122 |
| Ernst & Young | London | 2 | 89 |
| Mckinsey | London | 2 | 37 |
| Cognizant Worldwide | London | 2 | 18 |
| Moorhouse Consulting | London | 2 | 13 |
| Finyx Consulting | Milton Keynes | 2 | 4 |
| Global Resourcing | Croydon | 2 | 2 |
| KPMG | London | 1 | 102 |
| Specialist Computer Centres | West Midlands | 1 | 122 |
| CDW | London | 1 | 71 |
| Bytes Software Services | Leatherhead | 1 | 70 |
| Computacenter | Southwark | 1 | 118 |
| Biffa Waste Services | High Wycombe | 1 | 36 |
| Gartner | Egham | 1 | 26 |
| Banner Group | Normanton | 1 | 26 |
| Capgemini | Henderson Road Longman Estate | 1 | 36 |
| Methods Business & Digital Technology | London | 1 | 40 |
| BMG Research | West Midlands | 1 | 19 |
| CGI IT | London | 1 | 21 |
| Eversheds Sutherland | Newcastle upon Tyne | 1 | 20 |
| Pinsent Masons | Park Row | 1 | 17 |
| Gatenbysanderson | Leeds | 1 | 11 |
| Baringa Partners | London | 1 | 18 |
| CPC Project Services | City of London | 1 | 16 |
| TMP | London | 1 | 10 |
| Edenred UK Group | Pimlico | 1 | 11 |
| Engine Partners | London | 1 | 23 |
| Mastek | Reading | 1 | 9 |
| Runtime Collective | Brighton | 1 | 8 |
| Granicus Firmstep | London | 1 | 7 |
| BAE Systems Applied Intelligence | Guildford | 1 | 9 |
| SLR Consulting | Aylesbury | 1 | 8 |
| Burges Salmon | One Glass Wharf | 1 | 7 |
| Boxxe | York | 1 | 7 |
| North Highland | Maidenhead | 1 | 5 |
| DMW Group | London | 1 | 8 |
| Bsi Cybersecurity & Information Resilience | London | 1 | 4 |
| Premier People Solutions | Doncaster | 1 | 4 |
| Computacenter U K | St Albans | 1 | 4 |
| Advent Im | West Midlands | 1 | 3 |
| Aristi | Birmingham | 1 | 3 |
| Bang Communications | Cliddesden | 1 | 3 |
| Fenix Media | London | 1 | 3 |
| Reply | London | 1 | 3 |
| Topspeed Couriers | Winsford | 1 | 3 |
| Squiz | Hackney | 1 | 3 |
| Tecknuovo | London | 1 | 3 |
| Energy Assets | Livingston | 1 | 2 |
| First Intuition | London | 1 | 2 |
| Flexiform | Bradford | 1 | 2 |
| Herman Miller | Wiltshire | 1 | 2 |
| Marlborough Communications | Reigate and Banstead | 1 | 2 |
| Nuance Communications Ireland | None | 1 | 2 |
| PWC London Bridge | Hinckley and Bosworth | 1 | 2 |
| Ricardo Energy & Environment | Oxon | 1 | 2 |
| Wagstaff Interiors Group | Leyland | 1 | 2 |
| Nominet | Oxford | 1 | 2 |
| Sanderson Government & Defence | Bristol | 1 | 11 |
| Moloney Search | London | 1 | 2 |
| Cloudera | Palo Alto | 1 | 2 |
| Kinto | Portsmouth | 1 | 2 |
| Aaseya Software Services | London | 1 | 1 |
| Altius Consulting | Waverley | 1 | 1 |
| Arc Bim | London | 1 | 1 |
| BMG | Birmingham | 1 | 1 |
| Business in the Community | Bristol, City of | 1 | 1 |
| Butterfly Projects | Mid | 1 | 1 |
| Buying Team | City Of | 1 | 1 |
| Callcredit Public Sector | Leeds | 1 | 1 |
| Capita Customer Management | London | 1 | 1 |
| Cellxion | Oxted | 1 | 1 |
| Cognizant Technology Solutions Global Services | Paddington Central | 1 | 1 |
| Ecospend Technologies | London | 1 | 1 |
| European Dynamics | London | 1 | 1 |
| Fcdo Services | Milton Keynes | 1 | 1 |
| Fivium Holdings | London | 1 | 1 |
| Fleet Audits | Waterlooville | 1 | 1 |
| G3 Worldwide Mail | Ealing | 1 | 1 |
| Highspeed Office | London | 1 | 1 |