| YPO | Other | 1 | £6m | 25.7% | 2016-02-04 |
| HM Revenue & Customs | Other | 1 | £2m | 8.6% | 2018-10-10 |
| London Borough of Bexley | Other | 1 | £2m | 8.6% | 2017-01-23 |
| NEUPC Ltd | Other | 4 | £2m | 8.3% | 2025-05-01 |
| London Borough of Camden | Other | 1 | £2m | 6.9% | 2020-11-24 |
| FCANew | Other | 1 | £2m | 6.4% | 2025-08-28 |
| SE Shared Services | Other | 1 | £900k | 3.9% | 2020-08-14 |
| Kirklees CouncilNew | Other | 2 | £850k | 3.6% | 2026-02-25 |
| Homes for Haringey Ltd | Other | 1 | £658k | 2.8% | 2018-02-28 |
| London Borough of Hackney | Other | 1 | £530k | 2.3% | 2023-09-18 |
| Transport for London | Other | 1 | £500k | 2.1% | 2015-03-24 |
| NHS Digital | Other | 1 | £495k | 2.1% | 2024-01-30 |
| Financial Conduct Authority | Other | 1 | £400k | 1.7% | 2021-06-30 |
| capitalEsourcing | Other | 3 | £386k | 1.7% | 2021-10-01 |
| Thurrock Council | Other | 1 | £380k | 1.6% | 2023-11-10 |
| Financial Ombudsman Service | Other | 2 | £292k | 1.3% | 2024-11-08 |
| Competition and Markets Authority | Other | 1 | £269k | 1.2% | 2019-03-25 |
| CLARION HOUSING GROUP LIMITED | Other | 3 | £250k | 1.1% | 2020-12-31 |
| London Borough of BromleyNew | Other | 2 | £249k | 1.1% | 2025-07-14 |
| Leicester City Council | Other | 1 | £193k | 0.8% | 2023-08-23 |
| OPEN UNIVERSITY(THE)New | Other | 1 | £180k | 0.8% | 2025-10-28 |
| BIP SOLUTIONS LIMITED | Other | 1 | £149k | 0.6% | 2022-02-01 |
| South West Police Procurement Department (SWPPD) | Other | 1 | £143k | 0.6% | 2018-12-03 |
| Royal Borough of Kingston Upon Thames | Other | 2 | £123k | 0.5% | 2017-02-13 |
| Equality and Human Rights Commission | Other | 2 | £110k | 0.5% | 2020-12-22 |
| Royal Borough of Greenwich | Other | 1 | £100k | 0.4% | 2023-09-28 |
| Cheshire Constabulary on behalf of the Police and Crime Commissioner for Cheshire | Other | 1 | £100k | 0.4% | 2023-03-29 |
| Wandle Housing Association | Other | 1 | £100k | 0.4% | 2018-06-19 |
| Ministry of Defence | Other | 4 | £95k | 0.4% | 2023-02-27 |
| Nottinghamshire County Council | Other | 2 | £90k | 0.4% | 2020-09-01 |
| Doncaster MBC | Other | 1 | £83k | 0.4% | 2019-10-04 |
| VELOCITY 400 LIMITED | Other | 1 | £80k | 0.3% | 2016-11-01 |
| London Borough of Waltham ForestNew | Other | 1 | £68k | 0.3% | 2024-06-18 |
| Department for International Trade | Other | 1 | £65k | 0.3% | 2021-03-02 |
| Ofgem | Other | 1 | £58k | 0.2% | 2021-02-19 |
| Hampshire County CouncilNew | Other | 1 | £50k | 0.2% | 2026-01-16 |
| Manchester City Council | Other | 2 | £50k | 0.2% | 2017-08-31 |
| West Yorkshire Combined Authority | Other | 1 | £47k | 0.2% | 2019-09-12 |
| East Riding of Yorkshire Council | Other | 1 | £38k | 0.2% | 2022-08-24 |
| Islington Council | Other | 1 | £38k | 0.2% | 2019-04-05 |
| Radioactive Waste Management Limited | Other | 2 | £32k | 0.1% | 2019-05-29 |
| London Borough of Redbridge | Other | 1 | £30k | 0.1% | 2021-03-25 |
| Crawley Borough Council | Other | 1 | £25k | 0.1% | 2022-10-24 |
| Crown Commercial Service | Other | 1 | £22k | 0.1% | 2023-08-08 |
| BFI | Other | 1 | £18k | 0.1% | 2019-08-05 |
| The Insolvency Service | Other | 1 | £16k | 0.1% | 2023-11-21 |
| CRESCENT PURCHASING LIMITED | Other | 1 | £10k | 0.0% | 2017-10-25 |
| BBC (British Broadcasting Corporation) | Other | 1 | £0k | 0.0% | 2016-12-12 |
| Procurement Services - Lifecycle on behalf of COMMERCIAL SERVICES KENT LIMITED | Other | 6 | £0k | 0.0% | 2023-11-22 |
| Midland HeartNew | Other | 1 | £0k | 0.0% | 2025-05-08 |
| Valuation Office Agency | Other | 1 | £0k | 0.0% | 2020-02-12 |
| UK SHARED BUSINESS SERVICES LIMITED | Other | 1 | £0k | 0.0% | 2017-02-02 |
| Tower Hamlets | Other | 1 | £0k | 0.0% | 2016-07-14 |
| Birmingham City Council | Other | 1 | £0k | 0.0% | 2016-03-17 |
| Sandwell Metropolitan Borough Council | Other | 1 | £0k | 0.0% | 2015-11-11 |
| The Mayor and Commonalty and Citizens of the City of London | Other | 3 | £0k | 0.0% | |
| Renfrewshire Leisure Limited | Other | 1 | £0k | 0.0% | |
| University of Bristol | Other | 1 | £0k | 0.0% | |
| The Council of the Borough of Kirklees | Other | 1 | £0k | 0.0% | |
| East Ayrshire Council | Other | 2 | £0k | 0.0% | |
| Higher Education Purchasing Consortia for Wales | Other | 2 | £0k | 0.0% | |
| NHS SHARED BUSINESS SERVICES LIMITED | Other | 1 | £0k | 0.0% | |
| Westminster City Council | Other | 1 | £0k | 0.0% | |
| West Lothian Council | Other | 1 | £0k | 0.0% | |
| Espo | Other | 1 | £0k | 0.0% | |