| Leeds City Council | Leeds | 23 | 764 |
| Ministry of Housing Communities & Local Government | St Leonards on Sea, London | 9 | 128 |
| UK Shared Business Services | Swindon | 8 | 1,344 |
| NHS Digital | Leeds | 6 | 82 |
| MOD MOD | Liverpool, Portsmouth, Andover | 5 | 709 |
| Department for Education | Manchester, London | 5 | 376 |
| Southern Universities Purchasing Consortium | Reading | 4 | 18 |
| Intellectual Property Office | Newport | 3 | 52 |
| Financial Conduct Authority | London | 3 | 38 |
| Atamis | London | 3 | 3 |
| Bristol City Council | Bristol | 2 | 563 |
| Home Office | London | 2 | 478 |
| NHS Shared Business Services | Salford | 2 | 294 |
| NHS Arden & Greater East Midlands CSU | Derby | 2 | 198 |
| Bournemouth Christchurch & Poole Council | Bournemouth | 2 | 193 |
| Redcar & Cleveland Borough Council | Redcar | 2 | 178 |
| Norfolk & Norwich University Hospitals NHS Trust | Norwich | 2 | 15 |
| Gambling Commission | Birmingham | 2 | 4 |
| Department for Transport | London | 1 | 435 |
| Newcastle University | Newcastle upon Tyne | 1 | 425 |
| Gloucestershire County Council | Gloucester | 1 | 320 |
| Met Office | Exeter | 1 | 249 |
| Crown Commercial Service | Liverpool | 1 | 270 |
| Liverpool City Council | Liverpool | 1 | 217 |
| East Riding of Yorkshire Council | Beverley | 1 | 202 |
| HM Revenue & Customs | London | 1 | 192 |
| North Yorkshire County Council | Northallerton | 1 | 175 |
| Wolverhampton City Council | Wolverhampton | 1 | 154 |
| HS2 | Birmingham | 1 | 128 |
| United Lincolnshire Hospitals NHS Trust | Lincoln | 1 | 85 |
| Care Quality Commission | Newcastle upon Tyne | 1 | 65 |
| Foreign Commonwealth & Development Office | London | 1 | 57 |
| Cefas | Lowestoft | 1 | 56 |
| Star Procurement | Manchester | 1 | 73 |
| Leeds Trinity University | Leeds | 1 | 43 |
| Pension Protection Fund | Croydon | 1 | 19 |
| Blood Services South West | Bristol | 1 | 19 |
| Epsom & Ewell Borough Council | Epsom | 1 | 7 |
| Genomics England | London | 1 | 6 |
| Parliamentary & Health Service Ombudsman | London | 1 | 5 |
| Companies House | Cardiff | 1 | 5 |
| Ambulance Radio Programme | London | 1 | 5 |
| NHS Arden & Gem CSU | Derby | 1 | 21 |
| DFTC Department for Transport | London | 1 | 1 |
| DVLA Driver Vehicle & Licencing Agency | Swansea | 1 | 1 |
| Pensions Regulator | Brighton | 1 | 1 |