| FCO Services | Milton Keynes | 14 | 790 |
| Department for Education | London, Manchester, Newcastle upon Tyne | 13 | 376 |
| Department for Work & Pensions | Manchester, Blackpool, Hatfield | 13 | 282 |
| Atamis | London, Croydon | 12 | 12 |
| Met Office | Exeter | 9 | 249 |
| Department of Health & Social Care | London, Liverpool | 8 | 809 |
| Driver & Vehicle Licensing Agency | Swansea | 8 | 111 |
| Department of Health & Social Care DHSC | London, Westminster | 8 | 8 |
| Home Office | London | 7 | 478 |
| Norfolk Constabulary | Wymondham | 7 | 31 |
| Highways England | Guildford | 5 | 794 |
| British Transport Police | London | 5 | 5 |
| MOD | Andover, Portsmouth, Corsham | 4 | 709 |
| NHS Shared Business Services | Salford | 4 | 294 |
| NHS Business Services Authority | Newcastle upon Tyne | 4 | 45 |
| Fcdo Services | Milton Keynes | 4 | 4 |
| Hampshire County Council | Winchester | 3 | 254 |
| Department for Transport | Guildford | 2 | 435 |
| HM Revenue & Customs | London | 2 | 192 |
| Care Quality Commission | Newcastle upon Tyne | 2 | 65 |
| Intellectual Property Office | Newport | 2 | 52 |
| Caerphilly County Borough Council | Hengoed | 2 | 33 |
| Restoration & Renewal Delivery Authority | London | 2 | 16 |
| DFT | Swansea | 2 | 18 |
| Essex Police | Chelmsford | 2 | 2 |
| Senedd Cymru Welsh Parliament | Cardiff | 2 | 2 |
| Walsall Healthcare NHS Trust | Walsall | 2 | 2 |
| UK Shared Business Services | Swindon | 1 | 1,344 |
| Crown Commercial Service | Liverpool | 1 | 270 |
| NHS England | Leeds | 1 | 251 |
| NHS Arden & Greater East Midlands CSU | Derby | 1 | 198 |
| Southampton City Council | Southampton | 1 | 166 |
| HM Land Registry | Plymouth | 1 | 148 |
| Health Family | Leeds | 1 | 144 |
| HS2 | Birmingham | 1 | 128 |
| Bath & North East Somerset Council | Bath | 1 | 127 |
| Student Loans | Glasgow | 1 | 68 |
| Peterborough City Council | Peterborough | 1 | 79 |
| Worcester City Council | Worcester | 1 | 55 |
| Sthelens Council | St Helens | 1 | 55 |
| Office for National Statistics | Gwent | 1 | 40 |
| Transport for Greater Manchester | Manchester | 1 | 43 |
| Financial Services Compensation Scheme | London | 1 | 39 |
| Financial Ombudsman Service | London | 1 | 33 |
| Driver & Vehicle Standards Agency | Swansea | 1 | 31 |
| National Procurement Service Welsh Government | Cardiff | 1 | 22 |
| Bromford Housing Group | Wolverhampton | 1 | 17 |
| DVLA | Swansea | 1 | 14 |
| Parliamentary & Health Service Ombudsman | London | 1 | 5 |
| HM Passport Office Home Office | Liverpool | 1 | 5 |
| UK Debt Management Office | London | 1 | 5 |
| Police Fire & Crime Commissioner for Northamptonshire | Northampton | 1 | 1 |
| Department of Health & Social Care T&T | London | 1 | 1 |
| DVLA Driver Vehicle & Licencing Agency | Swansea | 1 | 1 |