| H M REVENUE & CUSTOMS | Other | 6 | £842m | 29.8% | 2025-06-19 |
| HM Revenue & Customs | Other | 7 | £651m | 23.1% | 2021-08-02 |
| MOD DE&S ISS CORSHAM | Other | 2 | £566m | 20.0% | 2017-06-16 |
| Home Office | Other | 21 | £194m | 6.9% | 2025-02-20 |
| Department for Work & Pensions | Other | 6 | £124m | 4.4% | 2020-02-24 |
| Transport for London | Other | 1 | £80m | 2.8% | 2016-09-29 |
| ATAMIS LTD | Other | 12 | £66m | 2.4% | 2021-12-20 |
| BIP SOLUTIONS LIMITED | Other | 1 | £50m | 1.8% | 2023-09-29 |
| Crown Commercial Service | Other | 6 | £44m | 1.6% | 2022-12-19 |
| Foreign Commonwealth and Development Office | Other | 2 | £44m | 1.6% | 2022-03-15 |
| BRITISH COUNCIL(THE) | Other | 1 | £27m | 1.0% | 2022-03-15 |
| Financial Conduct Authority | Other | 10 | £26m | 0.9% | 2023-08-01 |
| Bristol City Council | Other | 2 | £25m | 0.9% | 2023-01-31 |
| Department for Education | Other | 4 | £13m | 0.5% | 2022-10-27 |
| National Highways | Other | 2 | £8m | 0.3% | 2022-09-13 |
| HS2 | Other | 5 | £7m | 0.2% | 2022-10-28 |
| The Birmingham Organising Committee for the 2022 Commonwealth Games Ltd | Other | 1 | £6m | 0.2% | 2022-01-09 |
| EXCEEDING LIMITED | Other | 1 | £6m | 0.2% | 2019-07-09 |
| Ministry of Justice | Other | 3 | £5m | 0.2% | 2022-06-06 |
| National Highways Limited | Other | 3 | £5m | 0.2% | 2020-12-10 |
| Government Digital Service | Other | 1 | £5m | 0.2% | 2022-08-22 |
| Defence Equipment and SupportNew | Other | 2 | £5m | 0.2% | 2026-03-30 |
| Ministry of Defence, ISTAR, Other | Other | 1 | £4m | 0.1% | 2019-08-29 |
| HealthTrust Europe LLP (HTE) acting as agent for the University Hospitals of Coventry and Warwickshire NHS Trust (“UHCW”) | Other | 2 | £3m | 0.1% | 2020-02-03 |
| Business Energy and Industrial Strategy | Other | 2 | £3m | 0.1% | 2023-10-09 |
| HM Land Registry | Other | 3 | £2m | 0.1% | 2025-10-24 |
| Lancashire County Council | Other | 4 | £2m | 0.1% | 2023-08-14 |
| Nuclear Restoration ServicesNew | Other | 1 | £2m | 0.1% | 2025-03-27 |
| Department for Culture, Media and Sport | Other | 5 | £2m | 0.1% | 2022-11-11 |
| NHS Digital | Other | 1 | £960k | 0.0% | 2020-11-02 |
| Highways Agency | Other | 3 | £959k | 0.0% | 2017-12-17 |
| High Speed Two (HS2) Limited | Other | 1 | £943k | 0.0% | 2017-04-21 |
| CTM Portal for the NDA Shared Services Alliance | Other | 1 | £677k | 0.0% | 2022-03-30 |
| Ministry of Defence | Other | 7 | £636k | 0.0% | 2025-02-11 |
| Police and Crime Commissioner for LincolnshireNew | Other | 2 | £495k | 0.0% | 2026-03-12 |
| UNIVERSITY OF EAST ANGLIANew | Other | 1 | £417k | 0.0% | 2024-06-27 |
| Nuclear Restoration Services Limited (Dounreay) | Other | 2 | £305k | 0.0% | 2024-04-04 |
| CPS | Other | 3 | £255k | 0.0% | 2016-01-15 |
| Department for Transport | Other | 1 | £249k | 0.0% | 2019-12-24 |
| Defence Science and Technology Laboratory | Other | 1 | £200k | 0.0% | 2022-07-01 |
| Cheshire West and Chester CouncilNew | Other | 1 | £180k | 0.0% | 2024-09-24 |
| NATIONAL NUCLEAR LABORATORY LIMITED | Other | 1 | £155k | 0.0% | 2024-02-12 |
| Leeds City Council | Other | 4 | £100k | 0.0% | 2023-02-10 |
| Department of Health and Social Care (T&T) | Other | 1 | £76k | 0.0% | 2021-05-13 |
| United Kingdom Atomic Energy AuthorityNew | Other | 1 | £72k | 0.0% | 2025-02-27 |
| DfTc - Department for Transport | Other | 1 | £72k | 0.0% | 2023-05-19 |
| ICS on behalf of DSIT and DESNZNew | Other | 1 | £66k | 0.0% | 2025-10-10 |
| Kirklees Council | Other | 2 | £37k | 0.0% | 2020-02-03 |
| Department for Business, Energy & Industrial Strategy | Other | 1 | £12k | 0.0% | 2023-04-10 |
| Scottish Hydro Electric Power Distribution PlcNew | Other | 2 | £0k | 0.0% | 2025-12-22 |
| London Universities Purchasing Consortium | Other | 1 | £0k | 0.0% | 2017-08-28 |
| NI Water and its subsidiaries | Other | 1 | £0k | 0.0% | |
| the Education Authority | Other | 5 | £0k | 0.0% | |
| MERSEYRAIL ELECTRICS 2002 LIMITED | Other | 1 | £0k | 0.0% | |
| DWR CYMRU CYFYNGEDIG | Other | 1 | £0k | 0.0% | |
| Scottish Water | Other | 1 | £0k | 0.0% | |
| Libraries NI | Other | 1 | £0k | 0.0% | |
| NI Ambulance Service Trust | Other | 1 | £0k | 0.0% | |
| SMART APPLICATIONS MANAGEMENT LIMITED | Other | 1 | £0k | 0.0% | |
| Northern Trains Limited | Other | 2 | £0k | 0.0% | |
| WM5G LIMITED | Other | 1 | £0k | 0.0% | |
| Nuclear Restoration Services Limited | Other | 1 | £0k | 0.0% | |
| Department of Finance | Other | 1 | £0k | 0.0% | |
| Southern Universities Purchasing Consortium (SUPC) | Other | 4 | £0k | 0.0% | |
| Ministry of Defence, Typhoon Delivery Team | Other | 1 | £0k | 0.0% | |
| Social Security Scotland | Other | 1 | £0k | 0.0% | |
| NORTHUMBRIAN WATER LIMITED | Other | 1 | £0k | 0.0% | |
| Post Office Limited | Other | 2 | £0k | 0.0% | |
| South Lanarkshire Council | Other | 1 | £0k | 0.0% | |
| The Minister for the Cabinet Office acting through Crown Commercial Service | Other | 1 | £0k | 0.0% | |
| CPD - Supplies and Services Division | Other | 1 | £0k | 0.0% | |
| Department for the Economy | Other | 1 | £0k | 0.0% | |