| Yorkshire Purchasing OrganisationNew | Other | 2 | £40m | 39.6% | 2026-03-06 |
| Department for Environment Food & Rural Affairs | Other | 11 | £16m | 16.3% | 2025-10-27 |
| DEFRA | Other | 11 | £12m | 12.3% | 2022-01-31 |
| Espo | Other | 6 | £6m | 5.8% | 2024-01-31 |
| CTM Portal for the NDA Shared Services Alliance | Other | 2 | £5m | 5.4% | 2022-03-01 |
| Environment AgencyNew | Other | 1 | £5m | 4.8% | 2024-06-03 |
| Daventry District Council | Other | 1 | £4m | 3.9% | 2021-03-30 |
| Wigan Council | Other | 3 | £3m | 3.0% | 2024-02-13 |
| Nuclear Restoration Services LimitedNew | Other | 5 | £2m | 1.6% | 2026-05-06 |
| Fusion21 Members ConsortiumNew | Other | 2 | £1m | 1.3% | 2024-07-08 |
| Sanctuary Housing Association | Other | 2 | £1m | 1.2% | 2021-07-13 |
| London Borough of Lewisham | Other | 2 | £1m | 1.0% | 2025-03-11 |
| Guy's and St Thomas' NHS Foundation Trust | Other | 4 | £797k | 0.8% | 2023-11-08 |
| London Borough of Waltham Forest | Other | 1 | £700k | 0.7% | 2019-03-11 |
| TAMESIDE METROPOLITAN BOROUGH COUNCIL | Other | 1 | £350k | 0.3% | 2018-07-31 |
| Anchor Hanover GroupNew | Other | 1 | £300k | 0.3% | 2025-06-30 |
| Greater Manchester Combined Authority - GMP | Other | 1 | £300k | 0.3% | 2023-04-25 |
| L&Q Construction | Other | 1 | £222k | 0.2% | 2020-07-07 |
| UK Health Security Agency | Other | 1 | £215k | 0.2% | 2018-07-02 |
| BANK OF ENGLANDNew | Other | 1 | £175k | 0.2% | 2025-07-08 |
| East Sussex County Council | Other | 1 | £159k | 0.2% | 2021-12-20 |
| British Museum | Other | 1 | £83k | 0.1% | 2016-01-26 |
| Medicines and Healthcare Products Regulatory AgencyNew | Other | 1 | £80k | 0.1% | 2024-11-05 |
| National Audit Office | Other | 2 | £73k | 0.1% | 2024-03-25 |
| Royal Berkshire Fire & Rescue ServiceNew | Other | 1 | £70k | 0.1% | 2026-04-01 |
| Northumberland County Council | Other | 1 | £68k | 0.1% | 2021-09-09 |
| Natural EnglandNew | Other | 3 | £65k | 0.1% | 2025-11-26 |
| CENTRE FOR PROCESS INNOVATION LIMITED | Other | 1 | £60k | 0.1% | 2018-11-13 |
| Paradigm Housing Group | Other | 1 | £60k | 0.1% | 2018-12-24 |
| Tyne and Wear Fire and Rescue Authority | Other | 1 | £52k | 0.1% | 2022-06-23 |
| Radioactive Waste Management Limited | Other | 1 | £30k | 0.0% | 2016-03-07 |
| Offshore Renewable Energy Catapult | Other | 1 | £30k | 0.0% | 2023-04-18 |
| Staffordshire Police | Other | 1 | £26k | 0.0% | 2021-10-01 |
| SE Shared Services | Other | 1 | £26k | 0.0% | 2017-03-29 |
| Transport for London | Other | 2 | £19k | 0.0% | 2015-11-09 |
| Canterbury City Council | Other | 1 | £15k | 0.0% | 2019-10-09 |
| The Crown Estate | Other | 1 | £12k | 0.0% | 2024-04-28 |
| Leicestershire County Council, trading as ESPONew | Other | 2 | £0k | 0.0% | 2025-12-04 |
| Health and Safety Executive | Other | 1 | £0k | 0.0% | |
| Natural Resources Wales | Other | 1 | £0k | 0.0% | |
| YPO | Other | 1 | £0k | 0.0% | |
| ENVIRONMENT AGENCY (Defra Network eTendering Portal) | Other | 1 | £0k | 0.0% | |
| Police, Fire & Crime Commissioner for Staffordshire | Other | 1 | £0k | 0.0% | |
| Merseyside Fire and Rescue Authority | Other | 1 | £0k | 0.0% | |
| Magnox Limited | Other | 1 | £0k | 0.0% | |
| LHC | Other | 16 | £0k | 0.0% | |
| LGSS | Other | 1 | £0k | 0.0% | |
| British Library Board | Other | 1 | £0k | 0.0% | |
| Sellafield Ltd | Other | 1 | £0k | 0.0% | |
| NI Water and its subsidiaries | Other | 1 | £0k | 0.0% | |
| Department of Health & Social Care | Other | 1 | £0k | 0.0% | |