| London Borough of Waltham Forest | Other | 10 | £101m | 45.0% | 2026-02-24 |
| Commercial Services Kent LimitedNew | Other | 1 | £90m | 40.1% | 2026-03-30 |
| CIRRUS PURCHASING LTD | Other | 2 | £12m | 5.2% | 2025-08-27 |
| General Medical Council (GMC) | Other | 1 | £5m | 2.2% | 2020-04-01 |
| Leeds City Council | Other | 3 | £2m | 0.9% | 2025-05-01 |
| Public Health England | Other | 3 | £2m | 0.9% | 2021-04-02 |
| London Ambulance Service NHS Trust | Other | 39 | £2m | 0.7% | 2025-10-21 |
| UK Health Security Agency | Other | 16 | £1m | 0.6% | 2026-04-02 |
| DEFRA | Other | 21 | £1m | 0.5% | 2021-08-02 |
| South Cambridgeshire District Council | Other | 1 | £1m | 0.5% | 2016-07-18 |
| Nottingham Trent University | Other | 1 | £920k | 0.4% | 2019-10-07 |
| London Borough of Redbridge | Other | 1 | £655k | 0.3% | 2021-07-31 |
| Wandle Housing Association | Other | 2 | £606k | 0.3% | 2018-02-28 |
| Stevenage Borough Council - Department Of Community Services | Other | 1 | £538k | 0.2% | 2016-02-25 |
| Tees Valley Combined AuthorityNew | Other | 15 | £485k | 0.2% | 2026-03-25 |
| Department of Health and Social Care (DHSC) | Other | 20 | £367k | 0.2% | 2022-12-30 |
| Health Education England | Other | 2 | £341k | 0.2% | 2023-01-18 |
| Chesterfield Borough CouncilNew | Other | 2 | £309k | 0.1% | 2025-05-05 |
| First Ark Group | Other | 1 | £300k | 0.1% | 2018-07-02 |
| Middlesbrough Council | Other | 3 | £270k | 0.1% | 2024-02-12 |
| Department of Health and Social Care (T&T) | Other | 3 | £267k | 0.1% | 2021-08-25 |
| East Midlands Housing Group | Other | 1 | £245k | 0.1% | 2023-07-31 |
| Rotherham Metropolitan Borough Council | Other | 2 | £183k | 0.1% | 2022-03-31 |
| Construction Industry Training BoardNew | Other | 2 | £150k | 0.1% | 2026-01-20 |
| Ambulance Radio Programme (ARP) | Other | 1 | £127k | 0.1% | 2021-10-04 |
| SERIOUS FRAUD OFFICE | Other | 2 | £126k | 0.1% | 2022-08-12 |
| Bedford Borough Council | Other | 1 | £113k | 0.1% | 2022-05-18 |
| Department of Health & Social Care | Other | 5 | £106k | 0.0% | 2021-10-27 |
| NHS Arden and GEM CSU | Other | 2 | £89k | 0.0% | 2023-04-18 |
| UK SHARED BUSINESS SERVICES LIMITED | Other | 2 | £82k | 0.0% | 2018-10-25 |
| South Derbyshire District CouncilNew | Other | 2 | £81k | 0.0% | 2025-03-27 |
| HEE | Other | 1 | £81k | 0.0% | 2021-07-09 |
| Sussex Partnership NHS Foundation TrustNew | Other | 2 | £78k | 0.0% | 2026-03-11 |
| UKHSANew | Other | 1 | £75k | 0.0% | 2025-06-03 |
| Homes England (the name adopted by the Homes and Communities Agency) | Other | 1 | £74k | 0.0% | 2022-08-04 |
| City of London Corporation | Other | 1 | £67k | 0.0% | 2024-03-12 |
| LONDON SOUTH BANK UNIVERSITY | Other | 1 | £66k | 0.0% | 2018-10-19 |
| Torbay Council | Other | 2 | £64k | 0.0% | 2015-11-11 |
| Attain | Other | 1 | £64k | 0.0% | 2023-01-23 |
| FCDO Services | Other | 1 | £50k | 0.0% | 2023-03-14 |
| Bradford Teaching Hospitals NHS Foundation Trust | Other | 1 | £42k | 0.0% | 2023-10-24 |
| NORTH TYNESIDE COUNCIL | Other | 1 | £42k | 0.0% | 2018-03-23 |
| Yorkshire Ambulance Service | Other | 1 | £41k | 0.0% | 2023-11-30 |
| NHS Property Services LimitedNew | Other | 1 | £40k | 0.0% | 2026-03-24 |
| NHS MIDLANDS AND LANCASHIRE COMMISSIONING SUPPORT UNITNew | Other | 2 | £40k | 0.0% | 2024-12-05 |
| STAFFORDSHIRE AND LANCASHIRE COMMISSIONING SUPPORT UNIT | Other | 2 | £40k | 0.0% | 2022-01-28 |
| NHS Sheffield CCG | Other | 1 | £38k | 0.0% | 2020-03-30 |
| Hull City CouncilNew | Other | 1 | £38k | 0.0% | 2024-08-08 |
| SABP - Digital - Digital ConsultanciesNew | Other | 1 | £38k | 0.0% | 2025-12-09 |
| Derbyshire Dales District CouncilNew | Other | 1 | £34k | 0.0% | 2024-09-10 |
| Medicines and Healthcare Products Regulatory Agency | Other | 1 | £33k | 0.0% | 2023-08-17 |
| UNIVERSITY OF DERBY | Other | 1 | £32k | 0.0% | 2022-08-15 |
| County Durham and Darlington NHS Foundation Trust | Other | 1 | £32k | 0.0% | 2020-06-04 |
| The Queen Elizabeth Hospital King's Lynn NHS Foundation Trust | Other | 1 | £30k | 0.0% | 2019-05-19 |
| Health Research AuthorityNew | Other | 1 | £29k | 0.0% | 2026-04-20 |
| Department of Health and Social Care (T&T) | Other | 1 | £25k | 0.0% | 2021-08-17 |
| Calderdale and Huddersfield NHS Foundation Trust | Other | 1 | £25k | 0.0% | 2022-02-13 |
| Norwich City Council | Other | 2 | £25k | 0.0% | 2022-01-18 |
| NHS England | Other | 1 | £23k | 0.0% | 2023-05-18 |
| NHS Blood and Transplant (NHSBT)New | Other | 1 | £21k | 0.0% | 2026-02-06 |
| Sport England | Other | 1 | £19k | 0.0% | 2022-01-13 |
| The University of Nottingham | Other | 1 | £15k | 0.0% | 2019-09-05 |
| The National Archives | Other | 1 | £14k | 0.0% | 2024-01-24 |
| Newham College of Further Education | Other | 1 | £2k | 0.0% | 2017-10-06 |
| Department of Health and Social Care (London) | Other | 1 | £1k | 0.0% | 2020-12-20 |
| Housing 21 | Other | 1 | £1k | 0.0% | 2020-07-06 |
| DEPARTMENT FOR COMMUNITIES & LOCAL GOVERNMENT | Other | 1 | £0k | 0.0% | 2017-12-31 |
| ORBIT GROUP LIMITEDNew | Other | 4 | £0k | 0.0% | 2025-11-05 |
| CALDERDALE AND HUDDERSFIELD SOLUTIONS LTD | Other | 1 | £0k | 0.0% | 2022-03-31 |
| Sandwell Metropolitan Borough Council | Other | 3 | £0k | 0.0% | 2019-05-30 |
| Crown Commercial Service | Other | 1 | £0k | 0.0% | 2015-06-23 |
| Forest of Dean District Council | Other | 1 | £0k | 0.0% | |
| Oxford City Council | Other | 8 | £0k | 0.0% | |
| Thirteen Housing Group Limited | Other | 1 | £0k | 0.0% | |
| Cirrus Consortium c/o Halton Housing | Other | 2 | £0k | 0.0% | |
| Abri | Other | 2 | £0k | 0.0% | |
| NHS KENT AND MEDWAY INTEGRATED CARE BOARD | Other | 1 | £0k | 0.0% | |
| HealthTrust Europe LLP (HTE) acting on behalf of | Other | 1 | £0k | 0.0% | |
| EMH Care and Support Limited | Other | 1 | £0k | 0.0% | |
| The Police and Crime Commissioner for Warwickshire | Other | 1 | £0k | 0.0% | |
| London South East Colleges | Other | 1 | £0k | 0.0% | |
| NHS Property Services | Other | 1 | £0k | 0.0% | |
| Arun District Council | Other | 1 | £0k | 0.0% | |
| Procurement Services - Lifecycle on behalf of COMMERCIAL SERVICES KENT LIMITED | Other | 2 | £0k | 0.0% | |
| Mid and South Essex NHS Foundation Trust | Other | 1 | £0k | 0.0% | |
| Office for Students | Other | 1 | £0k | 0.0% | |
| MID CHESHIRE HOSPITALS NHS FOUNDATION TRUST | Other | 1 | £0k | 0.0% | |
| Leicestershire Police | Other | 1 | £0k | 0.0% | |
| Rother District Council | Other | 1 | £0k | 0.0% | |
| Staffordshire Moorlands District Council | Other | 1 | £0k | 0.0% | |
| Waltham invoice address | Other | 1 | £0k | 0.0% | |