| Government Commercial AgencyNew | Other | 6 | £1.6bn | 58.7% | 2026-02-13 |
| Department for Education | Other | 2 | £430m | 16.3% | 2020-04-21 |
| NHS Business Services Authority | Other | 3 | £191m | 7.2% | 2023-12-15 |
| NHS London Procurement Partnership (Hosted by Guy's and St Thomas' NHS FT) | Other | 2 | £111m | 4.2% | 2021-11-01 |
| Crown Commercial Service | Other | 6 | £75m | 2.9% | 2022-05-24 |
| Northern Procurement Group Limited | Other | 1 | £59m | 2.2% | 2016-12-13 |
| Ministry of Justice | Other | 5 | £55m | 2.1% | 2025-01-31 |
| Department for Work & Pensions | Other | 1 | £34m | 1.3% | 2018-11-20 |
| Driver and Vehicle Licensing AgencyNew | Other | 1 | £29m | 1.1% | 2025-07-09 |
| HM Land Registry | Other | 4 | £14m | 0.5% | 2020-11-09 |
| Bristol City Council | Other | 1 | £11m | 0.4% | 2021-10-11 |
| Sheffield Teaching Hospitals NHS Foundation Trust | Other | 1 | £11m | 0.4% | 2022-01-01 |
| Home Office | Other | 2 | £9m | 0.3% | 2016-10-16 |
| National Highways | Other | 2 | £8m | 0.3% | 2022-09-13 |
| Calderdale and Huddersfield NHS Foundation TrustNew | Other | 2 | £5m | 0.2% | 2025-12-24 |
| Crown Prosecution Service | Other | 1 | £5m | 0.2% | 2015-10-30 |
| Durham County Council | Other | 2 | £4m | 0.1% | 2025-02-06 |
| Worcestershire Acute Hospitals NHS TrustNew | Other | 2 | £4m | 0.1% | 2026-03-31 |
| Bradford Teaching Hospitals NHS Foundation TrustNew | Other | 1 | £3m | 0.1% | 2025-12-24 |
| Thurrock Borough Council - Anti Social Behaviour | Other | 1 | £2m | 0.1% | 2024-03-01 |
| National Highways Limited | Other | 2 | £2m | 0.1% | 2019-09-27 |
| CRESCENT PURCHASING LIMITED | Other | 2 | £2m | 0.1% | 2025-04-22 |
| ALETHEIA ACADEMIES TRUSTNew | Other | 1 | £2m | 0.1% | 2026-04-08 |
| London Borough of Barking and Dagenham | Other | 1 | £2m | 0.1% | 2019-09-24 |
| FINANCIAL SERVICES COMPENSATION SCHEME LIMITEDNew | Other | 1 | £2m | 0.1% | 2024-10-01 |
| NHS England | Other | 5 | £1m | 0.1% | 2026-03-09 |
| Lancashire Constabulary | Other | 2 | £1m | 0.1% | 2025-05-28 |
| Northumbria University | Other | 2 | £1m | 0.0% | 2024-03-21 |
| Hertfordshire NHS Procurement | Other | 1 | £1m | 0.0% | 2021-07-16 |
| Stoke-on-Trent City Council | Other | 1 | £1m | 0.0% | 2017-02-10 |
| Poole Hospital NHS Foundation Trust | Other | 2 | £1m | 0.0% | 2015-01-28 |
| Financial Conduct Authority | Other | 1 | £1m | 0.0% | 2023-12-19 |
| CPS | Other | 1 | £874k | 0.0% | 2023-03-16 |
| Warrington Borough Council | Other | 1 | £805k | 0.0% | 2022-07-01 |
| Ministry of Defence | Other | 5 | £756k | 0.0% | 2023-03-23 |
| Wigan CouncilNew | Other | 1 | £746k | 0.0% | 2025-09-05 |
| Kirklees Council | Other | 2 | £714k | 0.0% | 2025-02-06 |
| Office for National Statistics | Other | 1 | £678k | 0.0% | 2020-08-31 |
| Bolton Metropolitan Borough Council | Other | 1 | £570k | 0.0% | 2024-01-11 |
| Luton Council | Other | 1 | £520k | 0.0% | 2024-02-22 |
| Wolverhampton City Council | Other | 2 | £518k | 0.0% | 2024-07-15 |
| Homes England (the name adopted by the Homes and Communities Agency) | Other | 3 | £490k | 0.0% | 2025-11-03 |
| Torbay Council | Other | 1 | £480k | 0.0% | 2016-02-11 |
| Valuation Office Agency | Other | 5 | £432k | 0.0% | 2022-04-07 |
| Lancashire Fire & Rescue Service | Other | 1 | £410k | 0.0% | 2018-09-13 |
| NHS ResolutionNew | Other | 1 | £400k | 0.0% | 2025-06-06 |
| London Borough Of Islington | Other | 1 | £365k | 0.0% | 2023-09-22 |
| Cheshire Fire Authority | Other | 2 | £340k | 0.0% | 2024-05-08 |
| UK Health Security Agency | Other | 3 | £336k | 0.0% | 2025-03-26 |
| Hampshire County CouncilNew | Other | 1 | £304k | 0.0% | 2025-10-20 |
| Doncaster MBC | Other | 1 | £300k | 0.0% | 2018-06-19 |
| Gateshead College | Other | 2 | £299k | 0.0% | 2022-06-22 |
| Cheshire Constabulary on behalf of the Police and Crime Commissioner for CheshireNew | Other | 2 | £250k | 0.0% | 2025-03-19 |
| South West Police Procurement ServiceNew | Other | 1 | £214k | 0.0% | 2025-01-01 |
| UNIVERSITY OF NOTTINGHAM (THE) | Other | 3 | £211k | 0.0% | 2020-01-28 |
| Manchester City Council | Other | 1 | £202k | 0.0% | 2017-09-22 |
| UNIVERSITY OF DERBY | Other | 1 | £202k | 0.0% | 2022-03-10 |
| DVLA Commercial Directorate | Other | 2 | £200k | 0.0% | 2018-03-31 |
| University Of The West Of England | Other | 4 | £185k | 0.0% | 2019-08-20 |
| London Borough of Hackney | Other | 4 | £166k | 0.0% | 2020-08-16 |
| Your Homes Newcastle Ltd | Other | 1 | £150k | 0.0% | 2013-10-18 |
| Braintree District Council | Other | 1 | £135k | 0.0% | 2023-11-06 |
| University of York | Other | 1 | £122k | 0.0% | 2021-09-23 |
| Ministry of Defence, C&C, Naval Authority Group | Other | 1 | £111k | 0.0% | 2018-11-28 |
| Southampton Solent University | Other | 1 | £80k | 0.0% | 2023-09-29 |
| Southampton City CouncilNew | Other | 1 | £77k | 0.0% | 2025-01-20 |
| Greenfields Community Housing | Other | 1 | £58k | 0.0% | 2016-07-20 |
| HOMES & COMMUNITIES AGENCY | Other | 1 | £58k | 0.0% | 2016-03-30 |
| STOCKPORT HOMES LIMITEDNew | Other | 1 | £51k | 0.0% | 2025-10-29 |
| DEFRA | Other | 1 | £49k | 0.0% | 2019-06-19 |
| Epsom and Ewell Borough Council | Other | 1 | £46k | 0.0% | |
| Stockton on Tees Borough CouncilNew | Other | 1 | £43k | 0.0% | 2025-03-06 |
| University Hospitals Birmingham NHS Foundation TrustNew | Other | 1 | £37k | 0.0% | 2025-05-01 |
| Department of Health and Social Care (T&T) | Other | 1 | £35k | 0.0% | 2021-01-20 |
| The University of Nottingham | Other | 1 | £33k | 0.0% | 2016-07-14 |
| UKHSANew | Other | 1 | £20k | 0.0% | 2024-10-03 |
| LIVERPOOL HOPE UNIVERSITYNew | Other | 1 | £0k | 0.0% | 2024-08-06 |
| NCG Corporation | Other | 1 | £0k | 0.0% | 2017-12-07 |
| Sandwell Metropolitan Borough Council | Other | 1 | £0k | 0.0% | 2017-10-20 |
| NEUPC Ltd | Other | 1 | £0k | 0.0% | 2016-04-01 |
| The Minister for the Cabinet Office acting through Crown Commercial Service | Other | 4 | £0k | 0.0% | |
| Midlothian Council | Other | 1 | £0k | 0.0% | |
| the Education Authority | Other | 2 | £0k | 0.0% | |
| Public Sector | Other | 1 | £0k | 0.0% | |
| Guy's and St Thomas' NHS Foundation Trust | Other | 2 | £0k | 0.0% | |
| The Office of the Police and Crime Commissioner for Cleveland | Other | 1 | £0k | 0.0% | |
| North Western Universities Purchasing Consortium Ltd | Other | 2 | £0k | 0.0% | |
| PLYMOUTH COMMUNITY HOMES LIMITED | Other | 1 | £0k | 0.0% | |
| NHS Litigation Authority | Other | 1 | £0k | 0.0% | |
| NHS SHARED BUSINESS SERVICES LIMITED | Other | 1 | £0k | 0.0% | |
| East Dunbartonshire Council | Other | 1 | £0k | 0.0% | |
| Scottish Government | Other | 1 | £0k | 0.0% | |
| NHS London Procurement Partnership | Other | 1 | £0k | 0.0% | |
| Welsh Government | Other | 1 | £0k | 0.0% | |
| London Borough of Croydon | Other | 1 | £0k | 0.0% | |
| Education | Other | 1 | £0k | 0.0% | |