| NHS London Procurement Partnership (Hosted by Guy's and St Thomas' NHS FT) | Other | 2 | £111m | 42.5% | 2021-11-01 |
| Northern Procurement Group Limited | Other | 1 | £59m | 22.5% | 2016-12-13 |
| the Education AuthorityNew | Other | 2 | £20m | 7.5% | 2026-02-03 |
| YPO | Other | 4 | £18m | 6.9% | 2023-12-19 |
| Ipswich Borough Council | Other | 1 | £12m | 4.6% | 2018-12-05 |
| CPS | Other | 1 | £6m | 2.1% | 2021-04-14 |
| NEUPC Ltd | Other | 1 | £3m | 1.2% | 2021-03-01 |
| Department for Work & Pensions | Other | 1 | £3m | 1.1% | 2020-12-22 |
| Ministry of Defence | Other | 10 | £3m | 1.0% | 2022-09-30 |
| THE UNIVERSITY OF BIRMINGHAM | Other | 3 | £2m | 0.9% | 2024-07-06 |
| The Mayor and Commonalty and Citizens of the City of LondonNew | Other | 2 | £2m | 0.8% | 2025-06-17 |
| West Yorkshire Combined AuthorityNew | Other | 1 | £2m | 0.6% | 2026-02-12 |
| Sunderland City Council | Other | 2 | £2m | 0.6% | 2024-05-24 |
| City of Wolverhampton Council | Other | 1 | £1m | 0.6% | 2019-01-07 |
| Ministry of Housing, Communities & Local Government | Other | 4 | £1m | 0.5% | 2020-08-18 |
| Crown Commercial Service | Other | 1 | £1m | 0.5% | 2018-05-04 |
| Durham County Council | Other | 3 | £1m | 0.5% | 2022-08-23 |
| Surrey and Borders Partnership NHS Foundation Trust | Other | 1 | £1m | 0.4% | 2021-09-27 |
| Blackpool Council | Other | 1 | £1m | 0.4% | 2018-10-09 |
| Liverpool City Council | Other | 2 | £892k | 0.3% | 2022-12-31 |
| N H S Shared Business Services | Other | 1 | £655k | 0.3% | 2023-12-15 |
| UK SHARED BUSINESS SERVICES LIMITED | Other | 3 | £613k | 0.2% | 2026-06-17 |
| CRESCENT PURCHASING LIMITEDNew | Other | 1 | £605k | 0.2% | 2025-04-22 |
| Hertfordshire Community NHS Trust | Other | 2 | £510k | 0.2% | 2025-02-07 |
| City of London CorporationNew | Other | 1 | £508k | 0.2% | 2024-07-01 |
| Barnsley Metropolitan Borough Council | Other | 3 | £459k | 0.2% | 2022-12-06 |
| ONE HOUSING GROUP LIMITED | Other | 1 | £438k | 0.2% | 2017-07-17 |
| South of England Procurement CentreNew | Other | 1 | £375k | 0.1% | 2024-08-01 |
| HER MAJESTYS LAND REGISTRY | Other | 1 | £363k | 0.1% | 2018-03-15 |
| South Yorkshire Police HeadquartersNew | Other | 1 | £350k | 0.1% | 2025-08-01 |
| Southampton City Council | Other | 2 | £342k | 0.1% | 2024-03-30 |
| Newcastle University | Other | 4 | £330k | 0.1% | 2020-05-29 |
| British Transport Police | Other | 1 | £271k | 0.1% | 2020-06-03 |
| Transport for Greater Manchester | Other | 1 | £270k | 0.1% | 2018-03-19 |
| UNIVERSITY OF SOUTHAMPTONNew | Other | 1 | £260k | 0.1% | 2026-01-21 |
| Wolverhampton City CouncilNew | Other | 1 | £250k | 0.1% | 2024-08-12 |
| Police and Crime Commissioner for Lincolnshire | Other | 2 | £238k | 0.1% | 2024-05-14 |
| COLLEGE OF POLICING LIMITED | Other | 1 | £232k | 0.1% | 2022-08-22 |
| CHESHIRE EAST COUNCIL | Other | 1 | £230k | 0.1% | 2019-08-07 |
| Welland Procurement Unit | Other | 2 | £229k | 0.1% | 2018-08-02 |
| Writtle College | Other | 1 | £208k | 0.1% | 2016-04-25 |
| West Midlands Fire Service | Other | 2 | £203k | 0.1% | 2026-02-10 |
| DRIVER & VEHICLE LICENSING AGENCY | Other | 1 | £201k | 0.1% | 2021-10-12 |
| Stevenage Borough Council | Other | 1 | £183k | 0.1% | 2019-01-10 |
| STUDENT LOANS COMPANY LIMITEDNew | Other | 1 | £180k | 0.1% | 2024-08-07 |
| Student Loans Company | Other | 1 | £179k | 0.1% | 2019-05-03 |
| Board of Trustees of the Royal Botanic Gardens Kew | Other | 2 | £175k | 0.1% | 2024-04-30 |
| Historic England | Other | 2 | £168k | 0.1% | 2022-06-24 |
| North Kesteven District Council | Other | 1 | £166k | 0.1% | 2018-05-04 |
| The Litmus Partnership Ltd | Other | 2 | £165k | 0.1% | 2016-12-21 |
| The Northern School of ArtNew | Other | 1 | £153k | 0.1% | 2025-09-10 |
| The Rotherham NHS Foundation TrustNew | Other | 1 | £152k | 0.1% | 2024-07-23 |
| Freebridge Community Housing Limited | Other | 1 | £129k | 0.0% | 2017-09-18 |
| GREATER MANCHESTER EDUCATION TRUST | Other | 1 | £120k | 0.0% | 2022-01-31 |
| HUMBER TEACHING NHS FOUNDATION TRUSTNew | Other | 1 | £112k | 0.0% | 2026-04-01 |
| Leeds and York Partnership NHS Foundation Trust | Other | 1 | £111k | 0.0% | 2023-08-24 |
| The Water Services Regulation Authority | Other | 1 | £110k | 0.0% | 2018-07-09 |
| O F W A T | Other | 1 | £101k | 0.0% | 2023-07-20 |
| York CollegeNew | Other | 1 | £100k | 0.0% | 2025-06-21 |
| Buckinghamshire and Milton Keynes Fire Authority | Other | 1 | £95k | 0.0% | 2022-09-01 |
| Equality and Human Rights Commission | Other | 2 | £84k | 0.0% | 2023-11-23 |
| Department for Transport | Other | 2 | £84k | 0.0% | 2020-04-17 |
| Coventry - Solihull - Warwickshire | Other | 1 | £83k | 0.0% | 2018-08-31 |
| Yorkshire Purchasing OrganisationNew | Other | 1 | £80k | 0.0% | 2024-11-20 |
| Northumbria PoliceNew | Other | 1 | £79k | 0.0% | 2025-01-22 |
| mhs homes groupNew | Other | 1 | £75k | 0.0% | 2026-03-03 |
| Nottinghamshire County CouncilNew | Other | 1 | £75k | 0.0% | 2025-04-28 |
| Welland ProcurementNew | Other | 1 | £68k | 0.0% | 2025-03-07 |
| Stroud District Council | Other | 1 | £67k | 0.0% | 2022-11-02 |
| Star Procurement | Other | 1 | £65k | 0.0% | 2021-03-29 |
| UNIVERSITY OF SHEFFIELD | Other | 1 | £64k | 0.0% | 2019-08-20 |
| Westmorland and Furness CouncilNew | Other | 2 | £59k | 0.0% | 2025-09-10 |
| South Derbyshire District CouncilNew | Other | 1 | £57k | 0.0% | 2025-04-02 |
| Leeds City Council | Other | 1 | £42k | 0.0% | 2018-07-31 |
| University of Bedfordshire | Other | 1 | £40k | 0.0% | 2019-04-02 |
| Braintree District Council | Other | 1 | £39k | 0.0% | 2019-10-18 |
| Hampshire County Council | Other | 1 | £36k | 0.0% | 2021-06-11 |
| Victory Housing Trust | Other | 1 | £36k | 0.0% | 2017-11-08 |
| Milton Keynes Council | Other | 1 | £35k | 0.0% | 2019-05-01 |
| Harborough District Council | Other | 1 | £35k | 0.0% | 2017-02-28 |
| East Cambridgeshire District CouncilNew | Other | 1 | £32k | 0.0% | 2024-08-06 |
| Office of the Immigration Services Commissioner : Home Office | Other | 1 | £17k | 0.0% | 2019-04-23 |
| NHS England | Other | 1 | £15k | 0.0% | 2023-01-31 |
| Halton Borough Council | Other | 2 | £13k | 0.0% | 2016-10-19 |
| North Warwickshire and South Leicestershire CollegeNew | Other | 1 | £0k | 0.0% | 2025-01-21 |
| THE UNIVERSITY OF CUMBRIA | Other | 1 | £0k | 0.0% | 2021-11-13 |
| Lee Valley Regional Park Authority | Other | 1 | £0k | 0.0% | 2019-05-17 |
| Architects Registration Board | Other | 1 | £0k | 0.0% | 2018-10-19 |
| North Warwickshire Council | Other | 1 | £0k | 0.0% | 2018-05-21 |
| Dorset HealthCare University NHS Foundation Trust | Other | 1 | £0k | 0.0% | 2017-03-31 |
| Isle of Wight NHS Trust | Other | 1 | £0k | 0.0% | |
| The Minister for the Cabinet Office acting through Crown Commercial Service | Other | 2 | £0k | 0.0% | |
| Midland Heart Ltd | Other | 1 | £0k | 0.0% | |
| enFrame CIC | Other | 1 | £0k | 0.0% | |
| Scottish Government | Other | 1 | £0k | 0.0% | |
| Public Sector | Other | 1 | £0k | 0.0% | |
| TAMESIDE METROPOLITAN BOROUGH COUNCIL | Other | 1 | £0k | 0.0% | |
| Corporate Officer of the House of Lords | Other | 1 | £0k | 0.0% | |
| Guy's and St Thomas' NHS Foundation Trust | Other | 2 | £0k | 0.0% | |
| North Western Universities Purchasing Consortium Ltd | Other | 1 | £0k | 0.0% | |
| AGRICULTURE AND HORTICULTURE DEVELOPMENT BOARD | Other | 1 | £0k | 0.0% | |
| Kent County Council (t/a KCS) | Other | 4 | £0k | 0.0% | |
| NHS London Procurement Partnership | Other | 1 | £0k | 0.0% | |
| Welsh Government | Other | 1 | £0k | 0.0% | |