| Ecorys | Birmingham, West Midlands, Leeds | 5 | 10 |
| Ambex | Lancing, Adur | 5 | 5 |
| Softcat | London, Marlow | 9 | 176 |
| Computacenter | Hatfield, Welwyn Hatfield | 8 | 118 |
| CDW | London, Manchester | 5 | 71 |
| Southampton Marine Services | Southampton | 5 | 11 |
| Palladium | London | 5 | 11 |
| Capgemini | Woking, Holborn Viaduct | 4 | 36 |
| Glove Club | Perivale, Perivale Middlesex | 4 | 5 |
| Ambrey Shipyards | Southampton | 4 | 4 |
| Deloitte | London, City of London | 3 | 122 |
| PA Consulting Services | London, London | 3 | 54 |
| Market & Opinion Research | London | 3 | 22 |
| Office for Public Management | London | 3 | 5 |
| Robert Peel | Portsmouth, Hampshire | 3 | 3 |
| Drugloo | Colchester | 3 | 3 |
| Allied Publicity Services Manchester | Stockport, Cheadle | 2 | 9 |
| Yesss A Electrical | Normaton, Stockport | 2 | 8 |
| Walker Safety Cabinets | High Peak | 2 | 3 |
| Channel Tunnel Group | Folkestone, Folkestone and Hythe | 2 | 6 |
| Marine Specialised Technology | Merseyside | 2 | 4 |
| Ambrey | Hereford | 2 | 2 |
| Black Dog Crisis Management | Tba, Bedford | 2 | 2 |
| Primetech | Cornwall | 2 | 2 |
| Salterns Marina | Bournemouth, Christchurch and Poole, Poole | 2 | 2 |
| Shivom Consultancy | Null, Brentford | 2 | 2 |
| Insight Direct | Manchester | 8 | 121 |
| Vision Box Systems | Bracknell | 7 | 6 |
| Accenture | London | 6 | 30 |
| Phoenix Software | York | 4 | 93 |
| Serco | Bartley Way Hook | 4 | 38 |
| Alpine Resourcing | London | 4 | 3 |
| Leidos Innovations | Glasgow | 4 | 2 |
| BP Installations | London | 4 | 4 |
| Clearsprings Ready Homes | Rayleigh | 4 | 4 |
| IBM | Hants | 3 | 34 |
| Atos IT Services | London | 3 | 29 |
| CM Monitor Britain Thinks | Cornwall | 3 | 10 |
| Thoughtworks | Westminster | 3 | 6 |
| Central Lancashire University | Preston | 3 | 3 |
| Bytes Software Services | Leatherhead | 2 | 70 |
| Software Box | York | 2 | 89 |
| Ipsos MORI | Tower Hamlets | 2 | 55 |
| Probrand | Birmingham | 2 | 17 |
| CCS Media | Chesterfield | 2 | 17 |
| Victim Support | London | 2 | 8 |
| Amazon Web Services | City of London | 2 | 7 |
| 6Point6 | London | 2 | 5 |
| Kings Ferry | Gillingham | 2 | 2 |
| Ndi Technologies | Nantwich | 2 | 2 |
| Park Place Technologies | London | 2 | 2 |
| Xpo Supply Chain | Edinburgh | 2 | 2 |
| Axialys | Bois Grenier | 2 | 2 |
| Babcock Mission Critical Services Design & Completions | Cheltenham | 2 | 2 |
| CGI UK IT | Reading | 2 | 2 |
| Chartered Institute of Public Finance & Accountancy Cipfa | Croydon | 2 | 2 |
| Chess Dynamics | Horsham | 2 | 2 |
| Cmac Group | Accrington | 2 | 2 |
| Crest Advisory | London | 2 | 2 |
| Gama Aviation Engineering | Farnborough | 2 | 2 |
| Hobbs Parker | Ashford | 2 | 2 |
| Interact Consulting | Milton Keynes | 2 | 2 |
| Interspiro | Telford and Wrekin | 2 | 2 |
| Motorola | London | 2 | 2 |
| SMS Group | Lowestoft | 2 | 2 |
| Specialist Aviation Services | Cheltenham | 2 | 2 |
| Tim Parry Johnathan Ball Foundation for Peace | Warrington | 2 | 2 |
| Viqtor Davis | Sittingbourne | 2 | 2 |
| Westhill Commercial | Hove | 2 | 2 |
| Specialist Computer Centres | Birmingham | 1 | 122 |
| Northgate Public Services | Hemel Hempstead | 1 | 44 |
| European Electronique | Oakfield Industrial Estate | 1 | 34 |
| Centerprise | Basingstoke | 1 | 48 |
| Mears | Gloucester | 1 | 33 |
| Bloom Procurement Services | Newcastle upon Tyne | 1 | 30 |
| Methods Business & Digital Technology | Company Number | 1 | 40 |
| Behavioural Insights | London | 1 | 13 |
| Softwareone | London | 1 | 25 |
| Badenoch & Clark | London | 1 | 17 |
| Bruker | Coventry | 1 | 18 |
| Kantar | London | 1 | 16 |
| Learning Pool | Derry City and Strabane | 1 | 11 |
| Sap | Feltham | 1 | 15 |
| Experian | Nottingham | 1 | 8 |
| CACI | London | 1 | 18 |
| NTT Data | London | 1 | 13 |
| Arden Winch | None | 1 | 12 |
| Mastek | Reading | 1 | 9 |
| Caretower | London | 1 | 7 |
| Fujitsu Services | London | 1 | 12 |
| BAE Systems Applied Intelligence | Guildford | 1 | 9 |
| National Centre for Social Research | London | 1 | 7 |
| Enterprise Rent A Car | Tba | 1 | 7 |
| Boxxe | York | 1 | 7 |
| Four Communications Group | London | 1 | 7 |
| Apd Communications | Hemel Hempstead | 1 | 5 |
| Mti Technology | Godalming | 1 | 5 |
| North Highland | Windsor and Maidenhead | 1 | 5 |
| Faculty Science | Wellbeck Street London | 1 | 7 |
| Kongsberg Maritime | Aberdeen | 1 | 6 |