| Fusion21 Members Consortium | Other | 5 | £28m | 21.3% | 2025-02-24 |
| London Universities Purchasing ConsortiumNew | Other | 2 | £24m | 18.1% | 2025-12-04 |
| London Borough of Ealing | Other | 1 | £13m | 9.8% | 2018-12-12 |
| Doncaster MBC | Other | 1 | £9m | 6.6% | 2018-05-31 |
| Sanctuary Housing Group | Other | 1 | £8m | 5.7% | 2021-01-04 |
| Capital City College GroupNew | Other | 1 | £6m | 4.4% | 2025-05-20 |
| London Borough of HarrowNew | Other | 4 | £6m | 4.4% | 2026-04-16 |
| London Borough of Enfield | Other | 3 | £4m | 2.9% | 2023-09-26 |
| ProcurePublicNew | Other | 3 | £4m | 2.7% | 2024-08-12 |
| HCC - Community Protection | Other | 1 | £3m | 2.3% | 2021-07-09 |
| London Borough of Merton | Other | 2 | £3m | 2.0% | 2023-03-14 |
| N H S Shared Business ServicesNew | Other | 1 | £2m | 1.6% | 2024-09-13 |
| Peterborough City Council | Other | 1 | £2m | 1.5% | 2019-01-09 |
| NPTC Group of Colleges | Other | 2 | £2m | 1.4% | 2022-01-05 |
| NCG Corporation | Other | 1 | £2m | 1.3% | 2020-12-30 |
| Birmingham City CouncilNew | Other | 2 | £2m | 1.1% | 2025-02-17 |
| Kingston Upon Hull City Council | Other | 1 | £2m | 1.1% | 2021-10-27 |
| Colchester City Council | Other | 1 | £1m | 1.1% | 2019-04-16 |
| Wolverhampton City Council | Other | 1 | £1m | 1.0% | 2017-04-11 |
| North East Lincolnshire Council | Other | 1 | £1m | 1.0% | 2016-02-17 |
| Barnsley Metropolitan Borough Council | Other | 2 | £1m | 0.9% | 2020-03-02 |
| Espo | Other | 2 | £1m | 0.8% | 2021-01-04 |
| West Northamptonshire CouncilNew | Other | 1 | £1m | 0.8% | 2024-09-30 |
| London Borough of Sutton | Other | 4 | £900k | 0.7% | 2024-11-19 |
| Epping Forest College | Other | 1 | £767k | 0.6% | 2020-09-02 |
| Basingstoke and Deane Borough Council | Other | 4 | £758k | 0.6% | 2026-03-08 |
| ROOFTOP HOUSING GROUP LIMITEDNew | Other | 1 | £750k | 0.6% | 2025-12-23 |
| Trafford College | Other | 1 | £700k | 0.5% | 2019-03-13 |
| Tyne Coast Academy Trust | Other | 1 | £622k | 0.5% | 2022-04-05 |
| Cambridgeshire District Councils | Other | 1 | £620k | 0.5% | 2018-04-26 |
| West Dorset District Council | Other | 1 | £422k | 0.3% | 2018-04-16 |
| Woking Borough Council | Other | 1 | £399k | 0.3% | 2018-12-17 |
| Swale Borough Council | Other | 1 | £360k | 0.3% | 2016-01-14 |
| University of Brighton | Other | 1 | £352k | 0.3% | 2022-07-25 |
| FCDO Services | Other | 4 | £293k | 0.2% | 2020-07-23 |
| DEFRA | Other | 1 | £292k | 0.2% | 2019-11-12 |
| GREENSQUAREACCORD LIMITED | Other | 1 | £186k | 0.1% | |
| WELLSPRING ACADEMY TRUST | Other | 1 | £175k | 0.1% | 2021-03-19 |
| DWF LLP | Other | 1 | £159k | 0.1% | 2019-05-28 |
| Burnley Borough Council | Other | 1 | £152k | 0.1% | 2018-06-11 |
| Stockport Metropolitan Borough Council | Other | 1 | £120k | 0.1% | 2019-09-15 |
| SE Shared Services | Other | 1 | £91k | 0.1% | 2018-03-09 |
| UNIVERSITY OF DERBY | Other | 1 | £90k | 0.1% | 2023-10-31 |
| Dartford Borough Council | Other | 2 | £75k | 0.1% | |
| CRESCENT PURCHASING LIMITED | Other | 18 | £5k | 0.0% | 2020-04-08 |
| capitalEsourcingNew | Other | 1 | £0k | 0.0% | 2025-01-02 |
| Milton Keynes CollegeNew | Other | 1 | £0k | 0.0% | 2024-09-23 |
| Walsall Council e-Tendering | Other | 1 | £0k | 0.0% | 2020-01-24 |
| Reading Borough Council | Other | 1 | £0k | 0.0% | |
| Scotland Excel | Other | 2 | £0k | 0.0% | |
| Education | Other | 14 | £0k | 0.0% | |
| London Borough of Camden | Other | 2 | £0k | 0.0% | |
| University of the Highlands and Islands | Other | 1 | £0k | 0.0% | |
| Boston Borough Council | Other | 2 | £0k | 0.0% | |
| NHS SHARED BUSINESS SERVICES LIMITED | Other | 4 | £0k | 0.0% | |
| Maidstone Borough Council | Other | 2 | £0k | 0.0% | |
| University of South Wales | Other | 1 | £0k | 0.0% | |