| NHS North of England CSU | Durham | 12 | 6 |
| MOD | Andover, Corsham, London | 10 | 709 |
| Public Health England | London, Salisbury | 8 | 477 |
| East Riding of Yorkshire Council | Beverley | 7 | 202 |
| St Helens & Knowsley Teaching Hospitals NHS Trust | Prescot | 7 | 54 |
| Home Office | London | 5 | 478 |
| Department for Education | London, Manchester, Darlington | 5 | 376 |
| HM Land Registry | Plymouth | 5 | 148 |
| Southern Universities Purchasing Consortium | Reading | 5 | 18 |
| NHS Shared Business Services | Salford | 4 | 294 |
| Coventry City Council | Coventry | 4 | 74 |
| Atamis | London, Croydon | 4 | 4 |
| UK Shared Business Services | Swindon | 3 | 1,344 |
| Birmingham University | Birmingham | 3 | 237 |
| Crescent Purchasing Consortium | Salford | 3 | 62 |
| Transport for Greater Manchester | Manchester | 3 | 43 |
| Norfolk Constabulary | Wymondham | 3 | 31 |
| Ministry of Justice | London | 2 | 534 |
| Department for Work & Pensions | Manchester | 2 | 282 |
| London Borough of Hackney | Hackney | 2 | 138 |
| Manchester City Council | Manchester | 2 | 141 |
| LGSS | Northampton | 2 | 115 |
| Translink | Belfast | 2 | 87 |
| NHS Midlands & Lancashire CSU | West Bromwich | 2 | 66 |
| NHS Business Services Authority | Newcastle upon Tyne | 2 | 45 |
| NHS London Procurement Partnership | London | 2 | 38 |
| Financial Conduct Authority | London | 2 | 38 |
| College of Policing | Harrogate | 2 | 17 |
| Dorset Health Care University NHS Trust | Poole | 2 | 16 |
| Crown Prosecution Service | London | 2 | 20 |
| Office of Qualifications & Examinations Regulation Ofqual | Coventry | 2 | 9 |
| Labour Relations Agency | Belfast | 2 | 2 |
| London Borough of Waltham Forest | Walthamstow | 1 | 1,026 |
| Department of Health & Social Care | London | 1 | 809 |
| DEFRA Network Etendering Portal | Bristol | 1 | 675 |
| Sandwell Metropolitan Borough Council | West Midlands | 1 | 255 |
| Crown Commercial Service | Liverpool | 1 | 270 |
| HM Revenue & Customs | Telford | 1 | 192 |
| Sunderland City Council | Sunderland | 1 | 196 |
| Queen Elizabeth Hospital Kings Lynn NHS Trust | Kings Lynn | 1 | 157 |
| Cambridgeshire County Council | Cambridge | 1 | 127 |
| Royal Botanic Gardens Kew | Richmond | 1 | 117 |
| Southampton University | Southampton | 1 | 112 |
| Driver & Vehicle Licensing Agency | Swansea | 1 | 111 |
| British Business Bank | Sheffield | 1 | 107 |
| Student Loans | Glasgow | 1 | 68 |
| Star Procurement | Manchester | 1 | 73 |
| South Yorkshire Police Headquarters | Sheffield | 1 | 50 |
| Trafford Council | Manchester | 1 | 48 |
| Coventry University | Coventry | 1 | 36 |
| MSE Group | Southend | 1 | 30 |
| Independent Office for Police Conduct | London | 1 | 28 |
| European Centre for Medium Range Weather Forecasts Ecmwf | Reading | 1 | 26 |
| Frimley Health NHS Trust | Frimley | 1 | 24 |
| Blood Services South West | Bristol | 1 | 19 |
| Ofcom | London | 1 | 19 |
| Heriot Watt University | Edinburgh | 1 | 21 |
| Royal Holloway University of London | Egham | 1 | 10 |
| Cambridgeshire Fire & Rescue Service | Huntingdon | 1 | 6 |
| British Transport Police | London | 1 | 5 |
| Lichfield District Council | Lichfield | 1 | 6 |
| Police Fire & Crime Commissioner for Northamptonshire | Northampton | 1 | 1 |
| UK Strategic Command Headquarters Was JFC Northwood MOD | Liverpool | 1 | 1 |
| NI Assembly | Belfast | 1 | 1 |
| DFTC Department for Transport | London | 1 | 1 |
| South Devon College | Paignton | 1 | 1 |