| NHS London Procurement Partnership (Hosted by Guy's and St Thomas' NHS FT) | Other | 2 | £111m | 27.4% | 2021-11-01 |
| Crown Commercial Service | Other | 9 | £100m | 24.6% | 2023-03-24 |
| ICS on behalf of DSIT and DESNZNew | Other | 1 | £63m | 15.5% | 2024-10-07 |
| Department for Work & Pensions | Other | 6 | £10m | 2.4% | 2024-01-23 |
| Department of Health and Social Care (DHSC) | Other | 24 | £9m | 2.3% | 2021-04-01 |
| Department for Education | Other | 4 | £9m | 2.2% | 2022-12-09 |
| Warwickshire Police | Other | 1 | £8m | 2.0% | 2021-01-11 |
| Cabinet Office | Other | 3 | £8m | 1.9% | 2020-08-20 |
| Department of Health and Social Care (T&T) | Other | 7 | £7m | 1.7% | 2021-06-30 |
| Ministry of Justice | Other | 2 | £6m | 1.4% | 2024-09-27 |
| British Tourist Authority t/a VisitBritain/VisitEngland | Other | 1 | £5m | 1.2% | 2022-10-07 |
| DfTc - Department for Transport | Other | 8 | £5m | 1.2% | 2022-09-01 |
| Ministry of Defence | Other | 4 | £4m | 1.0% | 2025-03-05 |
| NHS Business Services Authority | Other | 1 | £4m | 0.9% | 2023-12-21 |
| West Yorkshire Combined Authority | Other | 1 | £3m | 0.9% | 2018-08-31 |
| NHS England | Other | 2 | £3m | 0.8% | 2024-02-13 |
| Pension Protection Fund | Other | 2 | £3m | 0.8% | 2022-06-27 |
| Nursing And Midwifery Council | Other | 5 | £3m | 0.8% | 2022-03-31 |
| DEFRA | Other | 7 | £3m | 0.8% | 2026-03-02 |
| N H S Shared Business Services | Other | 1 | £3m | 0.7% | 2024-01-26 |
| Health and Social Care Information Centre | Other | 1 | £3m | 0.7% | 2016-06-01 |
| Department for Environment Food & Rural Affairs | Other | 4 | £3m | 0.7% | 2025-03-06 |
| Department of Health & Social Care | Other | 4 | £2m | 0.5% | 2020-12-02 |
| UK Health Security Agency | Other | 3 | £2m | 0.5% | 2022-03-02 |
| HS2 | Other | 8 | £2m | 0.5% | 2021-08-24 |
| Department for Transport | Other | 4 | £2m | 0.4% | 2020-08-27 |
| capitalEsourcing | Other | 1 | £2m | 0.4% | 2023-04-24 |
| STUDENT LOANS COMPANY LIMITED | Other | 1 | £1m | 0.4% | 2022-11-01 |
| South Tyneside CouncilNew | Other | 1 | £1m | 0.3% | 2025-01-24 |
| O F W A TNew | Other | 2 | £1m | 0.3% | 2025-12-02 |
| Luton Council | Other | 1 | £1m | 0.3% | 2022-07-26 |
| CAMBRIDGE UNIVERSITY HOSPITALS NHS FOUNDATION TRUSTNew | Other | 1 | £996k | 0.2% | 2025-05-21 |
| Single Source Regulations Office | Other | 1 | £988k | 0.2% | 2023-01-25 |
| Durham County Council | Other | 6 | £822k | 0.2% | 2023-03-31 |
| London Borough of Enfield | Other | 2 | £821k | 0.2% | 2026-04-15 |
| Sunderland City Council | Other | 2 | £805k | 0.2% | 2022-12-01 |
| Chelsea and Westminster Hospital NHS Foundation TrustNew | Other | 1 | £723k | 0.2% | 2025-08-27 |
| EU SUPPLY LIMITEDNew | Other | 1 | £700k | 0.2% | 2025-02-06 |
| Wolverhampton City Council | Other | 2 | £671k | 0.2% | 2021-01-27 |
| Defence Equipment and Support | Other | 1 | £666k | 0.2% | 2024-02-19 |
| United Kingdom Hydrographic Office | Other | 25 | £660k | 0.2% | 2018-10-24 |
| OfgemNew | Other | 1 | £650k | 0.2% | 2025-08-01 |
| UK Government Investments : HM Treasury | Other | 1 | £500k | 0.1% | 2021-06-01 |
| Post OfficeNew | Other | 1 | £499k | 0.1% | 2024-09-12 |
| The Rotherham NHS Foundation Trust | Other | 1 | £470k | 0.1% | 2022-12-11 |
| Nottingham City Council | Other | 1 | £456k | 0.1% | 2021-12-02 |
| ATAMIS LTD | Other | 1 | £440k | 0.1% | 2020-10-01 |
| Nottinghamshire County Council | Other | 1 | £423k | 0.1% | 2019-05-22 |
| Government Legal Department | Other | 2 | £381k | 0.1% | 2022-03-31 |
| Department for International Trade | Other | 2 | £350k | 0.1% | 2021-07-22 |
| London Borough of Merton | Other | 1 | £350k | 0.1% | 2020-06-23 |
| Isle of Wight Council | Other | 4 | £340k | 0.1% | 2023-12-19 |
| Queen Victoria Hospital NHS Trust | Other | 1 | £330k | 0.1% | 2022-05-18 |
| Ministry of Housing, Communities & Local Government | Other | 1 | £306k | 0.1% | 2018-05-23 |
| NHS SOUTH, CENTRAL AND WEST COMMISSIONING SUPPORT UNIT | Other | 2 | £295k | 0.1% | 2024-07-08 |
| DERBY CITY COUNCIL | Other | 1 | £280k | 0.1% | 2015-06-30 |
| FCDO Services | Other | 3 | £258k | 0.1% | 2026-03-12 |
| The Water Services Regulation Authority | Other | 2 | £251k | 0.1% | 2022-03-11 |
| Suffolk Constabulary | Other | 1 | £246k | 0.1% | 2016-08-19 |
| UK SHARED BUSINESS SERVICES LIMITED | Other | 2 | £240k | 0.1% | 2023-09-29 |
| South Staffordshire District CouncilNew | Other | 1 | £234k | 0.1% | 2024-11-01 |
| Greater Manchester Combined Authority - Greater Manchester Police | Other | 1 | £226k | 0.1% | 2022-08-30 |
| NCG Corporation | Other | 1 | £201k | 0.0% | 2019-04-19 |
| DRIVER & VEHICLE LICENSING AGENCY | Other | 1 | £191k | 0.0% | 2019-03-01 |
| Manchester University NHS Foundation TrustNew | Other | 1 | £183k | 0.0% | 2025-05-30 |
| South London and Maudsley | Other | 1 | £150k | 0.0% | 2017-08-14 |
| HISTORIC ENGLAND LIMITED | Other | 1 | £122k | 0.0% | 2018-01-25 |
| Social Work EnglandNew | Other | 1 | £108k | 0.0% | 2024-12-09 |
| Competition and Markets Authority | Other | 1 | £104k | 0.0% | 2022-02-27 |
| Torbay Council - Childrens Services | Other | 1 | £102k | 0.0% | 2020-04-24 |
| Whittington HealthNew | Other | 2 | £102k | 0.0% | 2026-04-20 |
| CORBY BOROUGH COUNCIL | Other | 1 | £101k | 0.0% | 2020-10-23 |
| Liverpool City CouncilNew | Other | 1 | £95k | 0.0% | 2025-03-05 |
| Business Energy and Industrial Strategy | Other | 1 | £89k | 0.0% | 2023-09-29 |
| Wyre Forest District Council | Other | 1 | £87k | 0.0% | 2022-02-07 |
| Buckinghamshire and Milton Keynes Fire Authority | Other | 1 | £87k | 0.0% | 2021-01-18 |
| Department for Culture, Media and Sport | Other | 1 | £84k | 0.0% | 2022-02-18 |
| Care Quality Commission | Other | 2 | £81k | 0.0% | 2018-12-02 |
| Hertfordshire NHS Procurement | Other | 1 | £80k | 0.0% | 2019-11-14 |
| Bristol City CouncilNew | Other | 1 | £79k | 0.0% | 2025-09-01 |
| Somerset County Council | Other | 1 | £73k | 0.0% | 2022-11-25 |
| Wirral Borough CouncilNew | Other | 1 | £72k | 0.0% | 2025-03-31 |
| INSTITUTE FOR APPRENTICESHIPS | Other | 1 | £71k | 0.0% | 2023-01-13 |
| TRANSPORT SCOTLAND LIMITED | Other | 1 | £67k | 0.0% | 2020-07-29 |
| Kent County Council | Other | 1 | £65k | 0.0% | 2017-05-15 |
| Highways Agency | Other | 1 | £63k | 0.0% | 2016-11-04 |
| Fenland District CouncilNew | Other | 1 | £62k | 0.0% | 2025-07-11 |
| MCA - Maritime and Coastguard AgencyNew | Other | 1 | £54k | 0.0% | 2026-01-23 |
| Southampton City CouncilNew | Other | 2 | £50k | 0.0% | 2025-12-22 |
| The Pensions Regulator | Other | 1 | £43k | 0.0% | 2022-03-16 |
| Foreign Commonwealth and Development Office | Other | 1 | £42k | 0.0% | 2020-12-17 |
| Equality and Human Rights Commission | Other | 2 | £41k | 0.0% | 2020-09-18 |
| GREAT BRITISH ENERGY - NUCLEARNew | Other | 2 | £25k | 0.0% | 2026-03-16 |
| Merseyside Fire & Rescue Service | Other | 1 | £24k | 0.0% | 2021-02-25 |
| Intellectual Property Office | Other | 1 | £18k | 0.0% | 2017-09-05 |
| Public Health England | Other | 1 | £14k | 0.0% | 2020-03-25 |
| Birmingham City CouncilNew | Other | 1 | £10k | 0.0% | 2025-07-24 |
| Dixons Academies Charitable Trust Ltd | Other | 1 | £0k | 0.0% | 2024-04-17 |
| Department for Business, Energy & Industrial Strategy | Other | 1 | £0k | 0.0% | 2023-02-02 |
| National Audit Office | Other | 1 | £0k | 0.0% | 2016-01-29 |
| The Minister for the Cabinet Office acting through Crown Commercial Service | Other | 2 | £0k | 0.0% | |
| Islington Council | Other | 1 | £0k | 0.0% | |
| Mid and South Essex NHS Foundation Trust | Other | 1 | £0k | 0.0% | |
| NORTH TYNESIDE COUNCIL | Other | 1 | £0k | 0.0% | |
| Royal Borough of Kensington and Chelsea | Other | 1 | £0k | 0.0% | |
| VisitBritain/VisitEngland | Other | 1 | £0k | 0.0% | |
| NHS London Procurement Partnership | Other | 2 | £0k | 0.0% | |
| NHS SHARED BUSINESS SERVICES LIMITED | Other | 4 | £0k | 0.0% | |
| Guy's and St Thomas' NHS Foundation Trust | Other | 4 | £0k | 0.0% | |
| North Northamptonshire Council | Other | 1 | £0k | 0.0% | |