| Ministry of Defence | 12,748 | 9,794 | £348,000 |
| UK Research and Innovation | 12,047 | 11,727 | £83,330 |
| UK Shared Business Services Limited | 11,088 | 10,473 | £29,005 |
| Surrey County Council | 7,544 | 7,345 | £140,000 |
| National Highways | 7,034 | 6,686 | £77,723 |
| Ministry of Justice | 6,533 | 5,971 | £270,000 |
| Suffolk County Council | 6,210 | 6,001 | £102,111 |
| FCDO Services | 5,732 | 5,596 | £37,197 |
| Defra Network eTendering Portal | 5,713 | 5,000 | £57,200 |
| Department for Education | 5,490 | 4,590 | £200,000 |
| Bristol City Council | 5,388 | 4,814 | £118,870 |
| Crown Commercial Service | 5,166 | 4,552 | £98,726 |
| Foreign, Commonwealth and Development Office | 4,885 | 3,587 | £80,000 |
| London Borough of Haringey | 4,561 | 3,840 | £499,999 |
| Cumbria County Council | 4,547 | 4,197 | £83,000 |
| Leeds City Council | 4,528 | 4,074 | £66,038 |
| Leicester City Council | 4,518 | 3,823 | £334 |
| Home Office | 4,289 | 3,636 | £192,000 |
| Scottish Government | 4,192 | 3,640 | £71,819 |
| Milton Keynes City Council | 4,135 | 3,517 | £150,000 |
| Hampshire County Council | 4,094 | 3,575 | £121,737 |
| Sandwell Metropolitan Borough Council | 3,972 | 1,425 | £37,261 |
| NHS England | 3,935 | 3,068 | £102,000 |
| University of the West of England | 3,684 | 3,615 | £43,607 |
| Department for Transport | 3,497 | 3,192 | £75,000 |
| Transport for London | 3,473 | 2,776 | £1,969,152 |
| Department for Work and Pensions | 3,432 | 3,213 | £140,400 |
| Defra | 3,273 | 2,575 | £49,999 |
| The University of Birmingham | 3,255 | 3,017 | £57,523 |
| Department of Health and Social Care | 3,231 | 3,014 | £492,980 |
| Newcastle University | 3,229 | 3,073 | £51,592 |
| Durham County Council | 3,223 | 2,767 | £80,750 |
| East Riding of Yorkshire Council | 3,091 | 2,804 | £72,000 |
| Derbyshire County Council | 3,045 | 1,918 | £100,000 |
| Gloucestershire County Council | 3,001 | 2,378 | £88,920 |
| Darlington Borough Council | 2,954 | 2,615 | £90,000 |
| Met Office | 2,893 | 2,830 | £24,000 |
| North Yorkshire Council | 2,885 | 2,611 | £68,400 |
| SE Shared Services | 2,879 | 1,163 | £250,000 |
| Birmingham City Council | 2,755 | 1,467 | £941,485 |
| London Borough of Enfield | 2,752 | 2,538 | £7,653 |
| City of Bradford Metropolitan District Council | 2,723 | 2,299 | £76,953 |
| Nottingham City Council | 2,557 | 2,139 | £100,000 |
| NHS Property Services Limited | 2,554 | 2,514 | £84,846 |
| Midlands and Lancashire Commissioning Support Unit | 2,548 | 2,506 | £6,500,000 |
| Health Education England | 2,494 | 2,057 | £57,500 |
| West Northamptonshire Council | 2,492 | 2,317 | £49,875 |
| Leicestershire County Council | 2,379 | 2,072 | £57,000 |
| Homes England (the name adopted by the Homes and Communities Agency) | 2,288 | 2,150 | £55,000 |
| UK Health Security Agency | 2,285 | 2,129 | £46,457 |
| Public Health England | 2,143 | 1,788 | £50,000 |
| Buckinghamshire Council | 2,069 | 1,810 | £19,733 |
| City of London Corporation | 2,062 | 1,614 | £71,615 |
| Environment Agency | 2,036 | 1,844 | £80,000 |
| NHS Wales Shared Services Partnership - Procurement Services | 2,014 | 1,470 | £231,002 |
| H M Revenue & Customs | 1,974 | 1,893 | £68,756 |
| Derby City Council | 1,968 | 1,786 | £145,973 |
| NHS Arden and Greater East Midlands Commissioning Support Unit | 1,952 | 771 | £478,900 |
| The Queen Elizabeth Hospital King's Lynn NHS Foundation Trust | 1,944 | 1,902 | £27,570 |
| Suffolk Sourcing | 1,939 | 1,606 | £100,000 |
| NHS Shared Business Services | 1,923 | 806 | £600,000 |
| University of Sheffield | 1,907 | 1,477 | £130,000 |
| Buckinghamshire County Council | 1,904 | 1,782 | £15,000 |
| Maritime and Coastguard Agency | 1,847 | 1,706 | £44,091 |
| Lincolnshire County Council | 1,793 | 1,369 | £200,000 |
| Liverpool City Council | 1,781 | 1,454 | £150,000 |
| Staffordshire County Council | 1,780 | 1,552 | £110,028 |
| Nottinghamshire County Council | 1,770 | 1,488 | £179,088 |
| Kirklees Council | 1,767 | 1,477 | £99,606 |
| Sheffield City Council | 1,672 | 1,199 | £119,500 |
| Defence Science and Technology Laboratory | 1,656 | 1,568 | £78,038 |
| Hull City Council | 1,645 | 1,295 | £49,999 |
| NHS South, Central and West Commissioning Support Unit | 1,640 | 1,050 | £370,000 |
| Sunderland City Council | 1,609 | 1,441 | £85,000 |
| Lancashire County Council | 1,578 | 1,250 | £420,056 |
| Department for Business, Energy and Industrial Strategy | 1,574 | 1,243 | £120,000 |
| Northern Housing Consortium Limited | 1,574 | 1,531 | £115,000 |
| London Borough of Hackney | 1,572 | 1,239 | £115,575 |
| The University Of Nottingham | 1,564 | 1,275 | £62,357 |
| North East Lincolnshire Council | 1,546 | 1,255 | £150,000 |
| Barnsley Metropolitan Borough Council | 1,544 | 1,269 | £90,000 |
| Central Bedfordshire Council | 1,538 | 1,036 | £103,150 |
| Hull University Teaching Hospitals NHS Trust | 1,512 | 1,465 | £24,567 |
| City of Wolverhampton Council | 1,493 | 1,065 | £120,000 |
| London Borough of Waltham Forest | 1,465 | 1,172 | £106,000 |
| Cumberland Council | 1,441 | 1,393 | £207,548 |
| Kent County Council | 1,430 | 1,105 | £139,506 |
| North Lincolnshire Council | 1,410 | 1,160 | £86,365 |
| London Borough of Hillingdon | 1,407 | 733 | £158,000 |
| Department for International Trade | 1,360 | 1,165 | £42,943 |
| Sutton, Achieving for Children and Kingston | 1,334 | 1,334 | £4,384 |
| Highways Agency | 1,331 | 1,298 | £79,375 |
| Cornwall Council | 1,318 | 748 | £143,333 |
| Westmorland and Furness Council | 1,315 | 1,254 | £160,000 |
| Newcastle City Council | 1,303 | 934 | £175,000 |
| United Kingdom Atomic Energy Authority | 1,291 | 793 | £150,000 |
| West Sussex County Council | 1,286 | 1,073 | £240,000 |
| City of Doncaster Council | 1,276 | 1,157 | £203,751 |
| capitalEsourcing | 1,273 | 704 | £152,426 |
| Somerset Council | 1,270 | 1,020 | £112,341 |