| UK Research and Innovation (UKRI) | 12,860 | £2.4bn | 920 |
| Ministry of Defence | 11,035 | £90bn | 824 |
| NHS England | 10,174 | £26bn | 436 |
| Surrey County Council | 7,443 | £5.3bn | 61 |
| UK Shared Business Services (UK SBS) | 6,886 | £1.5bn | 412 |
| Department for Environment, Food and Rural Affairs | 6,835 | £10bn | 432 |
| Suffolk County Council Passenger Transport | 6,141 | £1.1bn | 715 |
| Scottish Government | 5,567 | £2.6bn | 103 |
| Highways England | 5,421 | £21bn | 328 |
| London Borough of Haringey | 5,324 | £821m | 90 |
| Ministry of Justice | 4,865 | £34bn | 368 |
| Foreign, Commonwealth and Development Office | 4,391 | £17bn | 301 |
| Bristol City Council | 4,358 | £3.8bn | 432 |
| Department for Education | 4,203 | £16bn | 306 |
| Leicester City Council | 4,100 | £2.2bn | 682 |
| NHS Wales Shared Services Partnership | 3,914 | £3.3bn | 163 |
| Milton Keynes City Council | 3,740 | £2.6bn | 117 |
| Hampshire County Council | 3,591 | £21bn | 274 |
| Public Services Delivery Scotland | 3,392 | £1.3bn | 51 |
| Department of Health and Social Care | 3,382 | £22bn | 100 |
| NHS Midlands and Lancashire Commissioning Support Unit | 3,204 | £793m | 37 |
| UK Health Security Agency | 3,189 | £5.9bn | 212 |
| Cumbria County Council | 3,035 | £676m | 33 |
| Buckinghamshire Council | 3,008 | £2.0bn | 77 |
| Home Office | 2,806 | £26bn | 276 |
| FCDO Services | 2,796 | £488m | 197 |
| Leeds City Council - PACS | 2,723 | £7.5bn | 207 |
| City of Doncaster Council | 2,711 | £1.0bn | 144 |
| NHS Property Services Limited | 2,683 | £1.1bn | 114 |
| North Yorkshire Council | 2,636 | £1.3bn | 154 |
| East Riding of Yorkshire Council | 2,596 | £1.7bn | 242 |
| Environment Agency | 2,511 | £1.6bn | 375 |
| West Northamptonshire Council | 2,493 | £1.1bn | 108 |
| Department for Work and Pensions | 2,473 | £31bn | 154 |
| Nottingham City Council | 2,442 | £1.3bn | 258 |
| City of London Corporation | 2,377 | £2.6bn | 135 |
| Leicestershire County Council | 2,312 | £1.9bn | 379 |
| Derbyshire County Council | 2,276 | £1.7bn | 174 |
| Fife Council | 2,243 | £229m | 13 |
| Durham County Council | 2,242 | £1.9bn | 175 |
| Department for Transport | 2,185 | £2.3bn | 212 |
| University of Birmingham | 2,163 | £381m | 48 |
| Forestry and Land Scotland | 2,137 | £403m | 6 |
| The City of Edinburgh Council | 2,120 | £634m | 20 |
| University of the West of England, Bristol | 2,100 | £316m | 21 |
| City of Bradford Metropolitan District Council | 2,081 | £884m | 176 |
| Transport for London | 2,052 | £22bn | 147 |
| Government Commercial Agency | 2,032 | £142bn | 207 |
| Lincolnshire County Council | 2,031 | £3.7bn | 74 |
| Homes England | 2,001 | £3.3bn | 156 |
| Sandwell Metropolitan Borough Council | 1,937 | £464m | 135 |
| Gloucestershire County Council | 1,919 | £1.4bn | 252 |
| Kent County Council | 1,900 | £8.0bn | 110 |
| Nottinghamshire County Council | 1,806 | £5.6bn | 245 |
| Darlington Borough Council | 1,806 | £570m | 180 |
| NHS North East and North Cumbria Integrated Care Board | 1,771 | £20bn | 5 |
| BIRMINGHAM CITY COUNCIL | 1,761 | £3.7bn | 244 |
| University of Edinburgh | 1,759 | £290m | 40 |
| Hull City Council | 1,741 | £832m | 121 |
| South Ayrshire Council | 1,719 | £206m | 10 |
| University of Glasgow | 1,691 | £362m | 40 |
| The Queen Elizabeth Hospital King's Lynn NHS Foundation Trust | 1,675 | £1.5bn | 26 |
| Cumberland Council | 1,614 | £485m | 116 |
| Defence Science and Technology Laboratory (Dstl) | 1,607 | £688m | 62 |
| Kirklees Council | 1,604 | £1.2bn | 126 |
| NHS Cambridgeshire and Peterborough Integrated Care Board | 1,596 | £474m | 1 |
| Scottish Police Authority | 1,587 | £188m | 11 |
| UK Atomic Energy Authority | 1,565 | £11bn | 64 |
| Westmorland and Furness Council | 1,565 | £442m | 148 |
| Forestry England | 1,550 | £609m | 64 |
| Sheffield City Council | 1,548 | £2.7bn | 168 |
| Hull University Teaching Hospitals NHS Trust | 1,546 | £600m | 112 |
| Met Office | 1,506 | £1.3bn | 96 |
| Nuclear Restoration Services | 1,494 | £625m | 120 |
| North Ayrshire Council | 1,457 | £256m | 36 |
| Maritime and Coastguard Agency | 1,437 | £2.5bn | 89 |
| London Borough of Hackney | 1,434 | £1.7bn | 105 |
| BEIS | 1,387 | £1.3bn | 27 |
| North Lanarkshire Council | 1,382 | £2.6bn | 28 |
| Achieving for Children | 1,357 | £28.3m | 3 |
| Llywodraeth Cymru / Welsh Government | 1,355 | £1.1bn | 37 |
| London Borough of Waltham Forest | 1,348 | £570m | 29 |
| Perth & Kinross Council | 1,346 | £290m | 10 |
| Newcastle University | 1,341 | £265m | 28 |
| West Sussex County Council | 1,323 | £1.6bn | 184 |
| London Borough of Merton | 1,313 | £1.0bn | 55 |
| Renfrewshire Council | 1,306 | £462m | 38 |
| BANK OF ENGLAND | 1,294 | £1.2bn | 109 |
| University of Strathclyde | 1,291 | £108m | 31 |
| London Borough of Enfield | 1,278 | £10bn | 58 |
| H M REVENUE & CUSTOMS | 1,269 | £17bn | 139 |
| North Lincolnshire Council | 1,259 | £257m | 87 |
| NHS South, Central and West Commissioning Support Unit | 1,252 | £1.6bn | 144 |
| Somerset Council | 1,251 | £1.4bn | 85 |
| Bournemouth, Christchurch and Poole Council | 1,245 | £1.3bn | 101 |
| Staffordshire County Council | 1,232 | £2.1bn | 113 |
| Coventry City Council | 1,214 | £2.9bn | 131 |
| Barnsley Metropolitan Borough Council | 1,205 | £531m | 83 |
| Natural England | 1,205 | £57.1m | 87 |
| DERBY CITY COUNCIL | 1,203 | £1.1bn | 117 |
| Greater Manchester Combined Authority | 1,187 | £1.9bn | 93 |
| Liverpool City Council | 1,179 | £2.0bn | 133 |
| Sellafield Ltd | 1,170 | £5.2bn | 103 |
| Norfolk County Council | 1,167 | £1.1bn | 88 |
| Essex County Council | 1,143 | £2.6bn | 85 |
| NHS Arden & GEM CSU | 1,142 | £1.7bn | 76 |
| Lancashire County Council | 1,138 | £2.6bn | 125 |
| Wolverhampton City Council | 1,131 | £704m | 124 |
| East Sussex County Council | 1,128 | £2.9bn | 71 |
| Cambridgeshire County Council | 1,118 | £811m | 92 |
| NHS West and North London Integrated Care Board | 1,106 | £2.0bn | 17 |
| Aberdeenshire Council | 1,105 | £445m | 31 |
| NHS Cheshire and Merseyside ICB | 1,103 | £15bn | 2 |
| Aberdeen City Council | 1,101 | £506m | 18 |
| Cheshire West and Chester Council | 1,099 | £1.1bn | 74 |
| Cardiff Council | 1,069 | £828m | 10 |
| West Midlands Combined Authority | 1,068 | £588m | 80 |
| Central Bedfordshire Council | 1,063 | £1.0bn | 108 |
| NORTHERN HOUSING CONSORTIUM LIMITED | 1,062 | £350m | 173 |
| Scottish Borders Council | 1,058 | £39.2m | 4 |
| United Lincolnshire Teaching Hospitals NHS Trust | 1,055 | £609m | 142 |
| The Highland Council | 1,048 | £683m | 22 |
| Dumfries and Galloway Council | 1,048 | £156m | 20 |
| Glasgow City Council | 1,035 | £320m | 15 |
| Sunderland City Council | 1,022 | £843m | 99 |
| British Council | 1,012 | £1.9bn | 117 |
| University of Sheffield | 1,012 | £373m | 68 |
| Centre for Process Innovation | 1,012 | £310m | 95 |
| Financial Conduct Authority | 1,001 | £1.0bn | 123 |
| West Yorkshire Combined Authority | 994 | £1.1bn | 104 |
| Department for International Trade | 990 | £821m | 32 |
| Historic England | 988 | £87.8m | 81 |
| City and County of Swansea | 986 | £125m | 92 |
| Wokingham Borough Council | 979 | £1.0bn | 76 |
| North Northamptonshire Council | 978 | £1.2bn | 102 |
| BiP Solutions | 974 | £1.4bn | 128 |
| BSO Procurement and Logistics Service (PaLS) | 963 | £1.2bn | 47 |
| NHS Greater Glasgow and Clyde | 963 | £1.2bn | 23 |
| London Borough of Hillingdon | 962 | £1.2bn | 92 |
| East Ayrshire Council | 958 | £319m | 49 |
| Brighton & Hove City Council | 948 | £1.3bn | 75 |
| Newcastle City Council | 927 | £811m | 90 |
| Scottish Prison Service | 917 | £496m | 34 |
| NHS South Yorkshire Integrated Care Board | 916 | £11bn | 15 |
| Norfolk and Norwich University Hospitals NHS Foundation Trust | 916 | £1.9bn | 69 |
| Rotherham Metropolitan Borough Council | 907 | £826m | 82 |
| Southampton City Council | 903 | £1.0bn | 64 |
| Middlesbrough Council | 898 | £216m | 57 |
| South Lanarkshire Council | 895 | £409m | 13 |
| NHS Blood and Transplant | 890 | £895m | 101 |