| UK Research and Innovation (UKRI) | 12,900 | £2.2bn | 849 |
| Ministry of Defence | 11,063 | £88bn | 829 |
| NHS England | 10,193 | £26bn | 408 |
| Surrey County Council | 7,529 | £5.3bn | 62 |
| UK Shared Business Services (UK SBS) | 6,892 | £1.5bn | 415 |
| Department for Environment, Food and Rural Affairs | 6,860 | £10bn | 431 |
| Suffolk County Council Passenger Transport | 6,219 | £1.1bn | 689 |
| Scottish Government | 5,581 | £2.6bn | 100 |
| Highways England | 5,466 | £21bn | 440 |
| London Borough of Haringey | 5,329 | £823m | 77 |
| Ministry of Justice | 4,892 | £34bn | 386 |
| Foreign, Commonwealth and Development Office | 4,401 | £9.8bn | 318 |
| Bristol City Council | 4,368 | £3.8bn | 360 |
| Department for Education | 4,217 | £16bn | 292 |
| Leicester City Council | 4,154 | £2.2bn | 698 |
| NHS Wales Shared Services Partnership | 3,933 | £3.3bn | 170 |
| Milton Keynes City Council | 3,743 | £2.6bn | 114 |
| Hampshire County Council | 3,618 | £21bn | 259 |
| Public Services Delivery Scotland | 3,398 | £1.3bn | 53 |
| Department of Health and Social Care | 3,390 | £22bn | 101 |
| NHS Midlands and Lancashire Commissioning Support Unit | 3,204 | £793m | 37 |
| UK Health Security Agency | 3,202 | £6.0bn | 209 |
| Cumbria County Council | 3,035 | £676m | 20 |
| Buckinghamshire Council | 3,009 | £2.0bn | 69 |
| Home Office | 2,819 | £26bn | 266 |
| FCDO Services | 2,797 | £488m | 194 |
| Leeds City Council - PACS | 2,726 | £11bn | 202 |
| City of Doncaster Council | 2,716 | £1.0bn | 142 |
| NHS Property Services Limited | 2,692 | £1.1bn | 120 |
| North Yorkshire Council | 2,641 | £1.3bn | 141 |
| East Riding of Yorkshire Council | 2,602 | £1.7bn | 238 |
| West Northamptonshire Council | 2,575 | £1.1bn | 103 |
| Environment Agency | 2,529 | £1.6bn | 374 |
| Department for Work and Pensions | 2,478 | £31bn | 151 |
| Nottingham City Council | 2,455 | £1.4bn | 247 |
| City of London Corporation | 2,384 | £2.6bn | 128 |
| Leicestershire County Council | 2,330 | £1.9bn | 377 |
| Derbyshire County Council | 2,288 | £1.7bn | 174 |
| Fife Council | 2,247 | £229m | 13 |
| Durham County Council | 2,245 | £1.9bn | 167 |
| Department for Transport | 2,189 | £2.3bn | 203 |
| University of Birmingham | 2,164 | £381m | 45 |
| Forestry and Land Scotland | 2,137 | £403m | 5 |
| The City of Edinburgh Council | 2,123 | £633m | 21 |
| University of the West of England Higher Education Corporation | 2,100 | £316m | 15 |
| City of Bradford Metropolitan District Council | 2,088 | £885m | 170 |
| Transport for London | 2,054 | £22bn | 154 |
| Lincolnshire County Council | 2,037 | £3.7bn | 99 |
| Government Commercial Agency | 2,035 | £142bn | 204 |
| Homes England | 2,005 | £3.3bn | 153 |
| Sandwell Metropolitan Borough Council | 1,941 | £464m | 136 |
| Gloucestershire County Council | 1,920 | £1.4bn | 246 |
| Kent County Council | 1,909 | £8.0bn | 110 |
| Darlington Borough Council | 1,816 | £574m | 177 |
| Nottinghamshire County Council | 1,812 | £5.8bn | 236 |
| NHS North East and North Cumbria Integrated Care Board | 1,773 | £20bn | 5 |
| University of Edinburgh | 1,766 | £281m | 40 |
| BIRMINGHAM CITY COUNCIL | 1,761 | £3.7bn | 239 |
| Hull City Council | 1,745 | £834m | 123 |
| South Ayrshire Council | 1,727 | £206m | 9 |
| University of Glasgow | 1,691 | £360m | 39 |
| The Queen Elizabeth Hospital King's Lynn NHS Foundation Trust | 1,677 | £2.3bn | 26 |
| Cumberland Council | 1,619 | £485m | 83 |
| Kirklees Council | 1,612 | £1.2bn | 123 |
| Defence Science and Technology Laboratory (Dstl) | 1,610 | £688m | 61 |
| NHS Cambridgeshire and Peterborough Integrated Care Board | 1,596 | £474m | 1 |
| Scottish Police Authority | 1,594 | £193m | 11 |
| Westmorland and Furness Council | 1,568 | £442m | 119 |
| UK Atomic Energy Authority | 1,567 | £11bn | 65 |
| Forestry England | 1,554 | £608m | 64 |
| Hull University Teaching Hospitals NHS Trust | 1,551 | £602m | 115 |
| Sheffield City Council | 1,549 | £2.7bn | 164 |
| Met Office | 1,512 | £1.3bn | 92 |
| Nuclear Restoration Services | 1,500 | £626m | 120 |
| North Ayrshire Council | 1,458 | £256m | 30 |
| Maritime and Coastguard Agency | 1,439 | £2.5bn | 84 |
| London Borough of Hackney | 1,438 | £1.7bn | 110 |
| BEIS | 1,387 | £1.3bn | 28 |
| North Lanarkshire Council | 1,386 | £2.6bn | 28 |
| Achieving for Children | 1,366 | £28.3m | 4 |
| Llywodraeth Cymru / Welsh Government | 1,362 | £1.1bn | 39 |
| Perth & Kinross Council | 1,354 | £290m | 9 |
| London Borough of Waltham Forest | 1,353 | £570m | 26 |
| Newcastle University | 1,341 | £265m | 29 |
| West Sussex County Council | 1,330 | £1.6bn | 184 |
| London Borough of Merton | 1,328 | £1.0bn | 53 |
| Renfrewshire Council | 1,312 | £462m | 39 |
| University of Strathclyde | 1,296 | £108m | 30 |
| BANK OF ENGLAND | 1,294 | £1.2bn | 109 |
| London Borough of Enfield | 1,280 | £10bn | 60 |
| H M REVENUE & CUSTOMS | 1,275 | £18bn | 142 |
| North Lincolnshire Council | 1,275 | £259m | 77 |
| Somerset Council | 1,265 | £1.4bn | 83 |
| NHS South, Central and West Commissioning Support Unit | 1,252 | £1.6bn | 145 |
| Bournemouth, Christchurch and Poole Council | 1,246 | £1.3bn | 103 |
| Staffordshire County Council | 1,243 | £2.1bn | 111 |
| Natural England | 1,216 | £57.2m | 92 |
| Coventry City Council | 1,215 | £2.9bn | 135 |
| DERBY CITY COUNCIL | 1,211 | £1.1bn | 115 |
| Barnsley Metropolitan Borough Council | 1,210 | £532m | 87 |
| Greater Manchester Combined Authority | 1,191 | £1.9bn | 87 |
| Liverpool City Council | 1,182 | £2.0bn | 112 |
| Norfolk County Council | 1,176 | £1.1bn | 91 |
| Sellafield Ltd | 1,175 | £5.2bn | 105 |
| East Sussex County Council | 1,149 | £2.9bn | 69 |
| Essex County Council | 1,145 | £2.6bn | 81 |
| NHS Arden & GEM CSU | 1,142 | £1.7bn | 71 |
| Wolverhampton City Council | 1,142 | £706m | 126 |
| Lancashire County Council | 1,141 | £2.6bn | 123 |
| Cambridgeshire County Council | 1,123 | £812m | 93 |
| Aberdeenshire Council | 1,108 | £445m | 30 |
| NHS West and North London Integrated Care Board | 1,107 | £2.0bn | 17 |
| NHS Cheshire and Merseyside ICB | 1,105 | £15bn | 2 |
| Cheshire West and Chester Council | 1,104 | £1.1bn | 77 |
| Aberdeen City Council | 1,104 | £506m | 19 |
| West Midlands Combined Authority | 1,080 | £589m | 76 |
| Cardiff Council | 1,070 | £838m | 10 |
| NORTHERN HOUSING CONSORTIUM LIMITED | 1,067 | £352m | 155 |
| Central Bedfordshire Council | 1,066 | £1.0bn | 106 |
| United Lincolnshire Teaching Hospitals NHS Trust | 1,061 | £611m | 139 |
| Scottish Borders Council | 1,059 | £39.2m | 4 |
| The Highland Council | 1,052 | £692m | 22 |
| Dumfries and Galloway Council | 1,049 | £156m | 20 |
| Glasgow City Council | 1,042 | £320m | 15 |
| British Council | 1,025 | £1.5bn | 115 |
| Sunderland City Council | 1,023 | £845m | 98 |
| Centre for Process Innovation | 1,017 | £309m | 96 |
| University of Sheffield | 1,012 | £372m | 66 |
| Financial Conduct Authority | 1,010 | £1.0bn | 129 |
| West Yorkshire Combined Authority | 1,001 | £1.1bn | 111 |
| City and County of Swansea | 996 | £125m | 83 |
| Historic England | 991 | £87.9m | 85 |
| Department for International Trade | 990 | £821m | 31 |
| BiP Solutions | 986 | £1.4bn | 133 |
| North Northamptonshire Council | 982 | £1.2bn | 93 |
| Wokingham Borough Council | 980 | £1.0bn | 73 |
| BSO Procurement and Logistics Service (PaLS) | 968 | £1.2bn | 46 |
| NHS Greater Glasgow and Clyde | 968 | £1.2bn | 18 |
| London Borough of Hillingdon | 965 | £1.2bn | 98 |
| East Ayrshire Council | 964 | £377m | 41 |
| Brighton & Hove City Council | 950 | £1.3bn | 88 |
| Newcastle City Council | 941 | £815m | 91 |
| Scottish Prison Service | 922 | £496m | 40 |
| NHS South Yorkshire Integrated Care Board | 917 | £11bn | 13 |
| Norfolk and Norwich University Hospitals NHS Foundation Trust | 916 | £1.9bn | 64 |
| Southampton City Council | 909 | £1.0bn | 65 |
| Rotherham Metropolitan Borough Council | 908 | £827m | 81 |
| Middlesbrough Council | 900 | £219m | 55 |
| South Lanarkshire Council | 899 | £409m | 14 |
| NHS Blood and Transplant | 895 | £899m | 100 |