| Leicestershire County Council, trading as ESPONew | Other | 10 | £1.3bn | 38.2% | 2026-04-14 |
| Leicestershire County Council | Other | 1 | £650m | 19.9% | 2022-10-19 |
| ANGLIAN WATER SERVICES LIMITEDNew | Other | 6 | £480m | 14.7% | 2025-12-10 |
| Hampshire County Council | Other | 2 | £268m | 8.2% | 2025-10-07 |
| Wokingham Borough CouncilNew | Other | 1 | £128m | 3.9% | 2025-05-08 |
| SE Shared Services | Other | 3 | £70m | 2.1% | 2020-12-08 |
| North London Waste Authority | Other | 1 | £61m | 1.9% | 2019-07-09 |
| Staffordshire County Council | Other | 15 | £53m | 1.6% | 2026-01-06 |
| North of England Commercial Procurement CollaborativeNew | Other | 1 | £30m | 0.9% | 2025-02-07 |
| Home Office | Other | 2 | £25m | 0.8% | 2021-09-01 |
| Wolverhampton City Council | Other | 1 | £20m | 0.6% | 2023-02-07 |
| E E M Ltd | Other | 1 | £19m | 0.6% | 2024-01-19 |
| Hertfordshire County CouncilNew | Other | 9 | £18m | 0.6% | 2026-04-28 |
| N H S Shared Business Services | Other | 1 | £17m | 0.5% | 2023-11-07 |
| London Borough of Hillingdon | Other | 3 | £16m | 0.5% | 2026-02-02 |
| Newcastle City Council | Other | 2 | £16m | 0.5% | 2025-05-14 |
| Fusion21 Members Consortium | Other | 1 | £13m | 0.4% | 2021-02-19 |
| Transport for London | Other | 2 | £11m | 0.3% | 2020-11-16 |
| Milton Keynes Council | Other | 1 | £10m | 0.3% | 2023-03-01 |
| Department of Health & Social Care | Other | 1 | £10m | 0.3% | 2023-07-25 |
| City of London Corporation | Other | 1 | £9m | 0.3% | 2020-09-24 |
| HealthTrust Europe LLP (HTE) acting as agent for the University Hospitals of Coventry and Warwickshire NHS Trust (“UHCW”) | Other | 1 | £8m | 0.2% | 2020-06-22 |
| Metropolitan Police Service | Other | 1 | £7m | 0.2% | 2018-10-22 |
| Lancashire County Council | Other | 1 | £7m | 0.2% | 2018-04-17 |
| Leeds City Council | Other | 8 | £6m | 0.2% | 2025-06-02 |
| London Universities Purchasing Consortium | Other | 2 | £5m | 0.2% | 2023-06-13 |
| Espo | Other | 3 | £5m | 0.1% | 2021-11-30 |
| Gentoo Group | Other | 2 | £5m | 0.1% | 2018-10-29 |
| Loughborough University | Other | 2 | £4m | 0.1% | 2025-07-18 |
| County Durham and Darlington NHS Foundation Trust | Other | 1 | £3m | 0.1% | 2020-12-09 |
| DERBY CITY COUNCIL | Other | 2 | £3m | 0.1% | 2020-03-25 |
| Northumbria Police | Other | 1 | £3m | 0.1% | 2023-08-15 |
| Yorkshire and Humber Police Procurement (Y&HPP) | Other | 1 | £3m | 0.1% | 2021-03-15 |
| HM Revenue & Customs | Other | 1 | £2m | 0.1% | 2020-08-30 |
| Kent County Council | Other | 2 | £2m | 0.1% | 2024-05-31 |
| Wakefield and District Housing limited | Other | 1 | £2m | 0.1% | 2023-06-26 |
| Hertfordshire County Council - Resources | Other | 1 | £2m | 0.0% | 2022-11-29 |
| South Yorkshire Police Headquarters | Other | 6 | £1m | 0.0% | 2021-05-16 |
| Coventry City Council | Other | 1 | £1m | 0.0% | 2021-08-09 |
| Hertfordshire NHS Procurement | Other | 1 | £1m | 0.0% | 2017-01-01 |
| Newcastle University | Other | 8 | £1m | 0.0% | 2023-07-19 |
| CHESHIRE EAST COUNCIL | Other | 1 | £1m | 0.0% | 2018-11-26 |
| The Princess Alexandra Hospital NHS Trust | Other | 2 | £840k | 0.0% | 2024-01-18 |
| Sovereign Housing Association | Other | 1 | £831k | 0.0% | 2018-11-20 |
| Cheshire West and Chester Council | Other | 2 | £809k | 0.0% | 2017-10-05 |
| South West Police Procurement Department (SWPPD) | Other | 1 | £782k | 0.0% | 2020-08-19 |
| English Heritage-National Collections: Historic Properties | Other | 1 | £757k | 0.0% | 2022-08-30 |
| Leeds Beckett UniversityNew | Other | 2 | £700k | 0.0% | 2025-01-13 |
| The Newcastle Upon Tyne Hospitals NHS Foundation Trust | Other | 1 | £694k | 0.0% | 2023-06-20 |
| Sandwell Metropolitan Borough Council | Other | 3 | £692k | 0.0% | 2024-05-15 |
| University of EssexNew | Other | 1 | £650k | 0.0% | 2026-05-20 |
| University Of The West Of England | Other | 4 | £635k | 0.0% | 2018-08-30 |
| HCC - Environment | Other | 1 | £620k | 0.0% | 2021-01-22 |
| Epping Forest District CouncilNew | Other | 1 | £600k | 0.0% | 2024-11-01 |
| Isle of Wight Council | Other | 2 | £590k | 0.0% | 2023-04-14 |
| UK SHARED BUSINESS SERVICES LIMITED | Other | 2 | £540k | 0.0% | 2021-03-16 |
| Middlesbrough Council | Other | 1 | £500k | 0.0% | 2019-09-30 |
| Peterborough City Council | Other | 1 | £490k | 0.0% | 2016-05-10 |
| Warwickshire Police | Other | 3 | £479k | 0.0% | 2022-07-27 |
| South Yorkshire Fire & RescueNew | Other | 1 | £445k | 0.0% | 2026-01-19 |
| Stoke-on-Trent City Council | Other | 2 | £410k | 0.0% | 2024-08-08 |
| The Gorse Academies Trust | Other | 1 | £405k | 0.0% | 2022-10-17 |
| Bath and Northeast Somerset, Swindon and Wiltshire STP | Other | 1 | £393k | 0.0% | 2021-04-27 |
| Tyne Coast CollegeNew | Other | 2 | £392k | 0.0% | 2025-08-05 |
| The Birmingham Organising Committee for the 2022 Commonwealth Games Ltd | Other | 1 | £375k | 0.0% | 2022-03-07 |
| University of Lincoln | Other | 1 | £360k | 0.0% | 2021-08-31 |
| The College of West AngliaNew | Other | 1 | £352k | 0.0% | 2025-06-26 |
| The Queen Elizabeth Hospital King's Lynn NHS Foundation Trust | Other | 6 | £351k | 0.0% | 2022-07-31 |
| Avon and Wiltshire Mental Health Partnership NHS trust | Other | 1 | £334k | 0.0% | 2019-05-14 |
| North Yorkshire PoliceNew | Other | 2 | £332k | 0.0% | 2025-10-30 |
| GOLDSMITHS' COLLEGE | Other | 1 | £324k | 0.0% | 2021-12-10 |
| Newcastle-under-Lyme Borough Council | Other | 1 | £322k | 0.0% | 2015-12-02 |
| UK Research and InnovationNew | Other | 1 | £320k | 0.0% | 2026-04-23 |
| Police and Crime Commissioner for LincolnshireNew | Other | 1 | £318k | 0.0% | 2026-03-05 |
| Surrey County Council | Other | 2 | £314k | 0.0% | 2024-03-08 |
| Thirteen Housing Group Limited | Other | 5 | £300k | 0.0% | 2024-09-20 |
| Durham County Council | Other | 2 | £292k | 0.0% | 2023-12-12 |
| THE UNIVERSITY OF BIRMINGHAM | Other | 2 | £282k | 0.0% | 2018-10-01 |
| East Lindsey District Council | Other | 1 | £280k | 0.0% | 2021-02-02 |
| UNIVERSITY OF SHEFFIELD | Other | 1 | £275k | 0.0% | 2017-11-28 |
| Princess Alexandra Hospital Trust | Other | 1 | £270k | 0.0% | 2022-08-20 |
| Community Health Partnerships Limited | Other | 1 | £267k | 0.0% | 2020-11-30 |
| Hamwic Education TrustNew | Other | 1 | £261k | 0.0% | 2025-12-12 |
| DARTMOOR MULTI ACADEMY TRUSTNew | Other | 1 | £250k | 0.0% | 2025-08-31 |
| North Lindsey College | Other | 1 | £250k | 0.0% | 2021-09-28 |
| University of Bradford | Other | 1 | £250k | 0.0% | 2020-01-20 |
| ATAMIS LTD | Other | 1 | £245k | 0.0% | 2021-06-14 |
| Grimsby Institute Of Further & Higher Education | Other | 1 | £240k | 0.0% | 2019-05-07 |
| Bradford Teaching Hospitals NHS Foundation Trust | Other | 1 | £240k | 0.0% | 2017-05-31 |
| University Hospitals of North Midlands NHS TrustNew | Other | 1 | £220k | 0.0% | 2024-11-29 |
| Flagship Housing Group | Other | 1 | £216k | 0.0% | 2019-09-25 |
| Sunderland College | Other | 1 | £210k | 0.0% | 2021-05-27 |
| Gateshead Council | Other | 1 | £200k | 0.0% | 2019-04-26 |
| Bedford College | Other | 1 | £198k | 0.0% | 2021-06-22 |
| Braintree District CouncilNew | Other | 1 | £196k | 0.0% | 2025-09-10 |
| East Suffolk and North Essex NHS FT | Other | 1 | £193k | 0.0% | 2019-05-09 |
| South Tyneside Council | Other | 1 | £188k | 0.0% | 2019-09-30 |
| Lancashire Constabulary | Other | 1 | £185k | 0.0% | 2020-01-07 |
| The City of Liverpool College | Other | 1 | £175k | 0.0% | 2022-09-12 |
| The Ipswich Hospital NHS Trust | Other | 3 | £171k | 0.0% | 2018-03-21 |
| TEC PartnershipNew | Other | 2 | £155k | 0.0% | 2025-08-28 |
| Surrey Heath Borough CouncilNew | Other | 1 | £150k | 0.0% | 2024-09-13 |
| University of Central Lancashire | Other | 1 | £140k | 0.0% | 2020-02-07 |
| Harrogate Borough Council | Other | 1 | £138k | 0.0% | 2018-04-26 |
| York and North Yorkshire Combined Authority acting as Fire and Rescue Authority.New | Other | 2 | £131k | 0.0% | 2025-10-30 |
| GREATER MANCHESTER EDUCATION TRUST | Other | 1 | £130k | 0.0% | 2021-07-26 |
| Dixons Academies Charitable Trust Ltd | Other | 1 | £119k | 0.0% | 2023-08-18 |
| Halesowen College | Other | 1 | £109k | 0.0% | 2019-02-22 |
| BIRKBECK COLLEGE | Other | 3 | £109k | 0.0% | 2025-05-24 |
| Optivo | Other | 1 | £109k | 0.0% | 2018-10-22 |
| Anglia Ruskin University | Other | 1 | £100k | 0.0% | 2024-01-08 |
| Lichfield District Council | Other | 2 | £90k | 0.0% | 2025-03-27 |
| LEARNING ACADEMY PARTNERSHIP (SOUTH WEST)New | Other | 1 | £85k | 0.0% | 2025-06-12 |
| East Staffordshire Borough CouncilNew | Other | 1 | £84k | 0.0% | 2026-04-29 |
| South Devon College | Other | 1 | £82k | 0.0% | 2021-12-21 |
| MCA - Maritime and Coastguard AgencyNew | Other | 1 | £70k | 0.0% | 2024-11-18 |
| Darlington College | Other | 1 | £68k | 0.0% | 2019-07-31 |
| Tameside CollegeNew | Other | 1 | £59k | 0.0% | 2024-11-04 |
| Warwickshire Police & West Mercia Police Procurement & Contracts Department | Other | 1 | £47k | 0.0% | 2017-10-04 |
| The Northern School of ArtNew | Other | 1 | £45k | 0.0% | 2025-07-17 |
| Bradford Metropolitan District Council | Other | 1 | £24k | 0.0% | 2018-03-08 |
| Davenant Foundation School | Other | 1 | £21k | 0.0% | 2020-01-16 |
| West Midlands Fire Service | Other | 1 | £18k | 0.0% | 2020-11-30 |
| National Highways Limited | Other | 2 | £14k | 0.0% | 2018-01-04 |
| Offshore Renewable Energy Catapult | Other | 1 | £0k | 0.0% | 2019-04-05 |
| Procurement Services - Lifecycle on behalf of COMMERCIAL SERVICES KENT LIMITEDNew | Other | 7 | £0k | 0.0% | 2025-06-16 |
| Dorset & Wiltshire Fire and Rescue AuthorityNew | Other | 2 | £0k | 0.0% | 2026-03-30 |
| SEVERN TRENT WATER LIMITEDNew | Other | 1 | £0k | 0.0% | 2026-03-19 |
| Reigate and Banstead Borough CouncilNew | Other | 1 | £0k | 0.0% | 2026-01-06 |
| Central Bedfordshire CouncilNew | Other | 1 | £0k | 0.0% | 2025-05-01 |
| LondonEnergy LtdNew | Other | 2 | £0k | 0.0% | 2025-04-17 |
| Hull College | Other | 1 | £0k | 0.0% | 2023-06-01 |
| NOE CPC | Other | 1 | £0k | 0.0% | 2021-03-12 |
| UNIVERSITY OF EAST ANGLIA | Other | 1 | £0k | 0.0% | 2020-05-22 |
| Nottingham Trent University | Other | 1 | £0k | 0.0% | 2019-12-11 |
| L&Q Construction | Other | 1 | £0k | 0.0% | 2018-08-16 |
| Coventry - Solihull - Warwickshire | Other | 1 | £0k | 0.0% | 2017-08-30 |
| Essex County Council | Other | 1 | £0k | 0.0% | 2017-04-28 |
| The Highland Council | Other | 1 | £0k | 0.0% | |
| North Northamptonshire Council | Other | 1 | £0k | 0.0% | |
| HEART ACADEMIES TRUST | Other | 1 | £0k | 0.0% | |
| Leeds and York Partnership NHS Foundation Trust, trading as North of England NHS Commercial Procurement Collaborative ("NOE CPC") | Other | 1 | £0k | 0.0% | |
| The Common Services Agency (more commonly known as NHS National Services Scotland) (NSS) | Other | 745 | £0k | 0.0% | |