| NHS London Procurement Partnership (Hosted by Guy's and St Thomas' NHS FT) | Other | 2 | £111m | 47.6% | 2021-11-01 |
| Northern Procurement Group Limited | Other | 1 | £59m | 25.2% | 2016-12-13 |
| Ministry of Defence | Other | 2 | £8m | 3.5% | 2019-01-24 |
| NEUPC Ltd | Other | 3 | £6m | 2.6% | 2021-03-01 |
| Gloucestershire County Council | Other | 1 | £6m | 2.6% | 2016-02-01 |
| Gateshead Council | Other | 1 | £4m | 1.5% | 2016-08-31 |
| University Of The West Of England | Other | 14 | £2m | 0.8% | 2024-08-19 |
| Lancashire County Council | Other | 2 | £2m | 0.8% | 2023-07-10 |
| CRESCENT PURCHASING LIMITED | Other | 2 | £2m | 0.8% | 2025-04-22 |
| LONDON SOUTH BANK UNIVERSITY | Other | 1 | £2m | 0.7% | 2018-04-06 |
| HM Land Registry | Other | 5 | £2m | 0.7% | 2024-08-12 |
| Bournemouth Christchurch and Poole Council | Other | 4 | £1m | 0.6% | 2023-01-11 |
| North Yorkshire County CouncilNew | Other | 1 | £1m | 0.6% | 2024-08-16 |
| East Sussex Healthcare NHS TrustNew | Other | 1 | £1m | 0.6% | 2024-09-11 |
| Crown Commercial Service | Other | 1 | £1m | 0.6% | 2018-05-04 |
| Warwickshire County Council | Other | 4 | £1m | 0.5% | 2026-03-13 |
| Calderdale and Huddersfield NHS Foundation Trust | Other | 1 | £1m | 0.5% | 2021-11-22 |
| British Forces Cyprus (Part of JFC) : Ministry of Defence | Other | 1 | £1m | 0.5% | 2019-10-31 |
| Academy Transformation TrustNew | Other | 1 | £1m | 0.4% | 2026-04-21 |
| Loughborough University | Other | 1 | £975k | 0.4% | 2023-03-17 |
| London Borough of Hackney | Other | 2 | £916k | 0.4% | 2024-03-01 |
| Cabinet Office | Other | 1 | £899k | 0.4% | 2022-03-15 |
| THE GUINNESS PARTNERSHIP LIMITED | Other | 1 | £874k | 0.4% | 2017-09-29 |
| British Transport Police | Other | 1 | £832k | 0.4% | 2024-03-20 |
| London Borough of Redbridge | Other | 1 | £800k | 0.3% | 2023-06-30 |
| Salford City Council | Other | 1 | £741k | 0.3% | 2016-01-15 |
| Dorset County Hospital NHS Foundation Trust | Other | 2 | £682k | 0.3% | 2024-01-04 |
| Liverpool City Council | Other | 2 | £583k | 0.3% | 2024-04-03 |
| Competition and Markets Authority | Other | 2 | £569k | 0.2% | 2022-03-31 |
| Met Office | Other | 1 | £557k | 0.2% | 2016-12-14 |
| West Northamptonshire Council | Other | 1 | £551k | 0.2% | 2024-04-03 |
| London Borough of Sutton | Other | 1 | £550k | 0.2% | 2018-09-06 |
| Sheffield Hallam University | Other | 5 | £523k | 0.2% | 2024-11-30 |
| Norse Commercial Services Ltd | Other | 1 | £511k | 0.2% | 2023-09-04 |
| Stockton on Tees Borough CouncilNew | Other | 1 | £427k | 0.2% | 2026-01-14 |
| DRIVER & VEHICLE LICENSING AGENCY | Other | 1 | £383k | 0.2% | 2016-01-05 |
| Southern HousingNew | Other | 1 | £383k | 0.2% | 2024-11-08 |
| TRINITY MULTI ACADEMY TRUST | Other | 2 | £373k | 0.2% | 2024-04-18 |
| Manchester Metropolitan University | Other | 2 | £359k | 0.2% | 2022-08-18 |
| NHS SOUTH, CENTRAL AND WEST COMMISSIONING SUPPORT UNIT | Other | 2 | £332k | 0.1% | 2024-05-13 |
| London Borough of Waltham Forest | Other | 1 | £310k | 0.1% | 2023-09-21 |
| DVLA Commercial Services Group | Other | 1 | £308k | 0.1% | 2019-01-15 |
| Burntwood School | Other | 2 | £305k | 0.1% | 2024-10-14 |
| H M REVENUE & CUSTOMS | Other | 1 | £300k | 0.1% | 2022-09-01 |
| North Northamptonshire CouncilNew | Other | 2 | £268k | 0.1% | 2025-09-11 |
| Lancashire Fire & Rescue ServiceNew | Other | 1 | £255k | 0.1% | 2024-09-11 |
| Civil Nuclear Police Authority (CNPA) / Civil Nuclear Constabulary (CNC) | Other | 1 | £250k | 0.1% | 2022-09-19 |
| Health & Safety Executive | Other | 1 | £235k | 0.1% | 2023-03-17 |
| The Christie NHS Foundation Trust | Other | 2 | £234k | 0.1% | 2024-05-20 |
| Weston CollegeNew | Other | 1 | £226k | 0.1% | 2026-03-03 |
| Shepway District Council | Other | 1 | £222k | 0.1% | 2016-01-06 |
| HER MAJESTYS LAND REGISTRY | Other | 2 | £220k | 0.1% | 2017-12-18 |
| Financial Ombudsman Service | Other | 1 | £213k | 0.1% | 2021-05-11 |
| London Borough of Bromley | Other | 2 | £211k | 0.1% | 2023-04-30 |
| In-Tend e-Tendering | Other | 1 | £192k | 0.1% | 2023-11-20 |
| Royal Borough of Kingston Upon Thames | Other | 2 | £192k | 0.1% | 2023-05-17 |
| Hampshire County Council | Other | 1 | £189k | 0.1% | 2022-06-17 |
| Crofty Education TrustNew | Other | 1 | £176k | 0.1% | 2025-12-19 |
| Darlington Borough Council | Other | 1 | £171k | 0.1% | 2022-07-29 |
| Basingstoke and Deane Borough Council | Other | 2 | £168k | 0.1% | 2025-04-15 |
| Department for Energy Security & Net Zero | Other | 1 | £162k | 0.1% | 2024-01-31 |
| DERBYSHIRE COMMUNITY HEALTH SERVICES NHS FOUNDATION TRUST | Other | 2 | £161k | 0.1% | 2021-11-16 |
| UNIVERSITY OF KEELE | Other | 1 | £156k | 0.1% | 2022-08-18 |
| National Archives Public Record Office | Other | 1 | £152k | 0.1% | 2017-03-10 |
| Royal Berkshire Fire & Rescue ServiceNew | Other | 1 | £150k | 0.1% | 2024-10-18 |
| Medicines and Healthcare Products Regulatory Agency | Other | 1 | £147k | 0.1% | 2023-06-30 |
| Lewisham Homes | Other | 1 | £126k | 0.1% | 2018-06-29 |
| ORDNANCE SURVEY LIMITED | Other | 1 | £126k | 0.1% | 2006-05-08 |
| University of Bath | Other | 1 | £124k | 0.1% | 2017-05-09 |
| Department for International Trade | Other | 2 | £106k | 0.0% | 2021-04-27 |
| Ordnance SurveyNew | Other | 1 | £103k | 0.0% | 2024-10-01 |
| Home OfficeNew | Other | 1 | £103k | 0.0% | 2024-07-26 |
| Barnsley Facilities LtdNew | Other | 1 | £102k | 0.0% | 2025-09-23 |
| NORTH EAST SURREY COLLEGE OF TECHNOLOGY TRUST | Other | 1 | £99k | 0.0% | 2023-09-14 |
| Royal Air Force (RAF) - Headquarters : Ministry of Defence | Other | 1 | £96k | 0.0% | 2019-06-13 |
| West Yorkshire Combined Authority | Other | 1 | £88k | 0.0% | 2023-01-12 |
| The Royal Parks LtdNew | Other | 1 | £84k | 0.0% | 2026-01-20 |
| Uttlesford District Council | Other | 2 | £80k | 0.0% | 2019-03-31 |
| UNIVERSITY OF SHEFFIELD | Other | 1 | £80k | 0.0% | 2019-03-20 |
| Information Commissioner's Office | Other | 2 | £78k | 0.0% | 2024-10-22 |
| UK SHARED BUSINESS SERVICES LIMITEDNew | Other | 3 | £72k | 0.0% | 2026-02-27 |
| London Borough of Newham | Other | 1 | £70k | 0.0% | 2023-02-08 |
| General Pharmaceutical Council | Other | 1 | £70k | 0.0% | 2023-07-13 |
| National Audit Office | Other | 1 | £66k | 0.0% | 2023-10-10 |
| Hartlepool Borough CouncilNew | Other | 1 | £65k | 0.0% | 2024-06-10 |
| London Borough of Enfield | Other | 1 | £62k | 0.0% | 2020-02-03 |
| TRINITY HOUSE | Other | 1 | £60k | 0.0% | 2019-10-23 |
| Department for Business, Energy & Industrial Strategy | Other | 1 | £55k | 0.0% | 2023-01-23 |
| NACRO | Other | 1 | £54k | 0.0% | 2018-07-16 |
| London Borough of Merton | Other | 1 | £53k | 0.0% | 2020-11-30 |
| East Berkshire College | Other | 1 | £50k | 0.0% | 2018-05-23 |
| Ministry of JusticeNew | Other | 1 | £48k | 0.0% | 2024-07-08 |
| ST HELENS & KNOWSLEY TEACHING HOSPITALS NHS TRUST | Other | 1 | £39k | 0.0% | 2020-03-11 |
| RUGBY BOROUGH COUNCIL | Other | 1 | £32k | 0.0% | 2022-09-26 |
| West Lindsey District Council | Other | 1 | £28k | 0.0% | 2024-04-17 |
| South Tyneside Council | Other | 1 | £27k | 0.0% | 2017-10-13 |
| Northern Lighthouse Board | Other | 1 | £26k | 0.0% | 2023-12-08 |
| Independent Police Complaints Commission | Other | 1 | £25k | 0.0% | 2016-03-07 |
| Office of Rail and RoadNew | Other | 1 | £24k | 0.0% | 2024-08-23 |
| Leeds City Council | Other | 1 | £21k | 0.0% | 2019-10-03 |
| Parliamentary and Health Service Ombudsman | Other | 1 | £19k | 0.0% | 2022-09-15 |
| Office of Qualifications and Examinations Regulation (Ofqual) | Other | 1 | £15k | 0.0% | 2023-01-04 |
| Northumberland County Council | Other | 1 | £14k | 0.0% | 2023-08-17 |
| NHS Arden and GEM CSU | Other | 1 | £11k | 0.0% | 2021-10-20 |
| 2buy2.com Limited | Other | 1 | £0k | 0.0% | 2017-09-01 |
| North Warwickshire and South Leicestershire CollegeNew | Other | 1 | £0k | 0.0% | 2025-01-21 |
| Wokingham Borough CouncilNew | Other | 1 | £0k | 0.0% | 2025-01-06 |
| GREATER MANCHESTER EDUCATION TRUST | Other | 1 | £0k | 0.0% | 2024-03-27 |
| Greenshaw Learning Trust | Other | 1 | £0k | 0.0% | |
| The Minister for the Cabinet Office acting through Crown Commercial Service | Other | 2 | £0k | 0.0% | |
| Choice Housing Ireland Limited | Other | 1 | £0k | 0.0% | |
| Scottish Government | Other | 1 | £0k | 0.0% | |
| Public Sector | 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% | |
| Perceval House | Other | 1 | £0k | 0.0% | |
| NHS London Procurement Partnership | Other | 1 | £0k | 0.0% | |
| Newry Mourne & Down District Council | Other | 1 | £0k | 0.0% | |
| Welsh Government | Other | 1 | £0k | 0.0% | |
| Newark And Sherwood District Council | Other | 1 | £0k | 0.0% | |
| Education | Other | 1 | £0k | 0.0% | |