| Department for Work & Pensions | Other | 16 | £4.1bn | 64.2% | 2024-11-21 |
| NS&INew | Other | 1 | £474m | 7.5% | 2024-12-23 |
| Crown Commercial Service | Other | 3 | £422m | 6.7% | 2021-03-26 |
| STUDENT LOANS COMPANY LIMITED | Other | 2 | £339m | 5.4% | 2022-10-19 |
| Department for Environment Food & Rural Affairs | Other | 5 | £174m | 2.7% | 2025-03-13 |
| DEFRA | Other | 7 | £152m | 2.4% | 2025-03-17 |
| Department of Health and Social Care (DHSC) | Other | 4 | £113m | 1.8% | 2023-11-01 |
| Home Office | Other | 15 | £93m | 1.5% | 2025-08-27 |
| Ministry of Justice | Other | 8 | £82m | 1.3% | 2025-05-22 |
| Ministry of Housing, Communities & Local GovernmentNew | Other | 1 | £64m | 1.0% | 2026-03-05 |
| Ministry of Defence | Other | 30 | £51m | 0.8% | 2025-06-26 |
| HS2 | Other | 2 | £42m | 0.7% | 2024-09-24 |
| ATAMIS LTD | Other | 4 | £23m | 0.4% | 2021-12-16 |
| N H S Shared Business Services | Other | 2 | £22m | 0.4% | 2024-04-26 |
| West Hertfordshire Teaching Hospitals NHS Trust | Other | 2 | £21m | 0.3% | 2026-03-26 |
| National Highways Limited | Other | 10 | £20m | 0.3% | 2025-12-09 |
| UK SHARED BUSINESS SERVICES LIMITED | Other | 6 | £16m | 0.3% | 2022-02-14 |
| National Highways | Other | 7 | £16m | 0.3% | 2022-09-13 |
| Hertfordshire NHS Procurement | Other | 1 | £15m | 0.2% | 2019-01-18 |
| Sellafield LtdNew | Other | 4 | £13m | 0.2% | 2025-12-02 |
| Network Rail Infrastructure Ltd | Other | 1 | £12m | 0.2% | 2019-07-04 |
| NHS England | Other | 6 | £11m | 0.2% | 2023-12-06 |
| NHS Business Services Authority | Other | 3 | £9m | 0.1% | 2018-03-16 |
| North Yorkshire County CouncilNew | Other | 1 | £8m | 0.1% | 2024-10-08 |
| FSCS | Other | 1 | £8m | 0.1% | 2016-09-13 |
| BBC (British Broadcasting Corporation) | Other | 8 | £7m | 0.1% | 2022-08-16 |
| Solent NHS Trust | Other | 1 | £6m | 0.1% | 2022-07-08 |
| HealthTrust Europe LLP (HTE) acting as agent for the University Hospitals of Coventry and Warwickshire NHS Trust (“UHCW”) | Other | 4 | £5m | 0.1% | 2020-02-06 |
| NHSBSA | Other | 1 | £5m | 0.1% | 2021-11-24 |
| Department for Transport | Other | 1 | £5m | 0.1% | 2020-09-30 |
| DIGITAL DEFENCE LIMITED | Other | 6 | £4m | 0.1% | 2023-05-30 |
| Department for Education | Other | 1 | £4m | 0.1% | 2020-06-17 |
| Department of Health & Social Care | Other | 1 | £4m | 0.1% | 2022-11-29 |
| Defence Digital (ISG) | Other | 2 | £4m | 0.1% | 2022-09-29 |
| Royal Free London NHS Foundation Trust | Other | 1 | £2m | 0.0% | 2021-05-17 |
| UK Health Security Agency | Other | 1 | £2m | 0.0% | 2022-01-12 |
| Nhs Blood & Transplant | Other | 2 | £2m | 0.0% | 2016-07-11 |
| Student Loans Company | Other | 3 | £2m | 0.0% | 2025-09-12 |
| South West Police Procurement Service | Other | 1 | £1m | 0.0% | 2022-12-16 |
| Transport for London | Other | 1 | £1m | 0.0% | 2016-11-29 |
| Blood Services South West | Other | 2 | £1m | 0.0% | 2019-06-11 |
| MOD DE&S ISS CORSHAM | Other | 2 | £1m | 0.0% | 2018-02-20 |
| Guy's and St Thomas' NHS Foundation Trust | Other | 2 | £850k | 0.0% | 2023-07-13 |
| Valuation Office Agency | Other | 2 | £643k | 0.0% | 2020-12-14 |
| Disclosure and Barring Service | Other | 2 | £635k | 0.0% | 2022-07-01 |
| Defence Equipment and Support | Other | 1 | £391k | 0.0% | 2022-10-07 |
| UK RESEARCH & INNOVATION | Other | 3 | £378k | 0.0% | 2024-01-26 |
| National Health Service Commissioning Board (known as NHS England ) | Other | 1 | £370k | 0.0% | 2022-10-24 |
| West Hertfordshire Hospitals NHS TrustNew | Other | 1 | £286k | 0.0% | 2024-10-09 |
| Royal Borough of Kingston Upon Thames | Other | 2 | £285k | 0.0% | 2023-06-15 |
| United Lincolnshire Teaching Hospitals NHS TrustNew | Other | 1 | £280k | 0.0% | 2025-11-17 |
| Partners Procurement Service | Other | 2 | £220k | 0.0% | 2019-09-09 |
| Bristol City Council | Other | 2 | £215k | 0.0% | 2018-12-19 |
| WAKEFIELD COUNCIL | Other | 1 | £210k | 0.0% | 2019-07-25 |
| NHS SOUTH, CENTRAL AND WEST COMMISSIONING SUPPORT UNIT | Other | 2 | £203k | 0.0% | 2021-04-18 |
| Sellafield | Other | 3 | £174k | 0.0% | 2017-01-05 |
| NOTTINGHAM UNIVERSITY HOSPITALS NHS TRUST | Other | 2 | £172k | 0.0% | 2022-03-30 |
| NHS Digital | Other | 1 | £130k | 0.0% | 2021-11-13 |
| Suffolk County Council | Other | 1 | £129k | 0.0% | 2016-01-13 |
| THE PENNINE ACUTE HOSPITAL N H S TRUST | Other | 1 | £116k | 0.0% | 2017-05-23 |
| MOORFIELDS EYE HOSPITAL NHS FOUNDATION TRUST | Other | 1 | £85k | 0.0% | 2023-01-10 |
| CHESHIRE EAST COUNCIL | Other | 1 | £74k | 0.0% | 2019-02-21 |
| Bradford Teaching Hospitals NHS Foundation Trust | Other | 1 | £67k | 0.0% | 2024-03-26 |
| British Transport Police | Other | 1 | £50k | 0.0% | 2021-04-26 |
| CENTRE FOR PROCESS INNOVATION LIMITEDNew | Other | 3 | £47k | 0.0% | 2024-11-08 |
| South Yorkshire Police and Crime Commissioner | Other | 1 | £47k | 0.0% | 2023-04-26 |
| UK Research and Innovation | Other | 1 | £36k | 0.0% | 2022-03-01 |
| MCA - Maritime and Coastguard Agency | Other | 1 | £32k | 0.0% | 2022-10-12 |
| Gambling Commission | Other | 1 | £32k | 0.0% | 2021-03-26 |
| City of London Corporation | Other | 1 | £29k | 0.0% | 2023-03-31 |
| FCDO Services | Other | 1 | £10k | 0.0% | 2015-10-06 |
| NPCC | Other | 1 | £6k | 0.0% | 2019-10-18 |
| Southend University Hospital NHS Foundation Trust | Other | 1 | £2k | 0.0% | 2018-09-06 |
| Scottish Hydro Electric Power Distribution PlcNew | Other | 1 | £0k | 0.0% | 2025-12-19 |
| CTM Portal for the NDA Shared Services Alliance | Other | 1 | £0k | 0.0% | 2021-08-26 |
| HM Revenue & Customs | Other | 2 | £0k | 0.0% | 2021-07-08 |
| NOE CPC | Other | 1 | £0k | 0.0% | 2020-11-10 |
| Foreign Commonwealth and Development Office | Other | 1 | £0k | 0.0% | 2018-01-25 |
| DEPARTMENT FOR INTERNATIONAL DEVELOPMENT | Other | 1 | £0k | 0.0% | 2016-09-07 |
| Ofgem | Other | 1 | £0k | 0.0% | 2015-08-26 |
| NHS SHARED BUSINESS SERVICES LIMITED | Other | 6 | £0k | 0.0% | |
| UK Research & Innovation | Other | 3 | £0k | 0.0% | |
| BLUELIGHT COMMERCIAL LIMITED | Other | 1 | £0k | 0.0% | |
| Sellafield Limited | Other | 2 | £0k | 0.0% | |
| THAMES WATER UTILITIES LIMITED | Other | 1 | £0k | 0.0% | |
| The Minister for the Cabinet Office acting through Crown Commercial Service | Other | 2 | £0k | 0.0% | |
| Mayor's Office for Policing And Crime | Other | 1 | £0k | 0.0% | |
| NS&I | Other | 1 | £0k | 0.0% | |
| Hywel Dda University Health Board | Other | 1 | £0k | 0.0% | |
| CAMBRIDGE UNIVERSITY HOSPITALS NHS FOUNDATION TRUST | Other | 1 | £0k | 0.0% | |
| University Of Edinburgh | Other | 2 | £0k | 0.0% | |