| NUCLEAR DECOMMISSIONING AUTHORITY | Other | 2 | £9m | 24.2% | 2023-10-12 |
| Department for Work & PensionsNew | Other | 1 | £4m | 11.6% | 2025-02-07 |
| Transport for London | Other | 1 | £4m | 11.5% | 2015-12-02 |
| DEPARTMENT FOR INTERNATIONAL DEVELOPMENT | Other | 1 | £4m | 10.4% | 2018-01-08 |
| Foreign Commonwealth and Development Office | Other | 1 | £4m | 10.1% | 2023-11-20 |
| NEUPC Ltd | Other | 2 | £3m | 8.2% | 2021-03-01 |
| NHS SOUTH, CENTRAL AND WEST COMMISSIONING SUPPORT UNITNew | Other | 4 | £2m | 5.7% | 2025-12-29 |
| National Audit Office | Other | 3 | £1m | 3.7% | 2026-03-13 |
| Nuclear Restorartion ServicesNew | Other | 1 | £1m | 3.7% | 2025-01-22 |
| Lincolnshire County Council | Other | 1 | £1m | 3.3% | 2024-02-14 |
| Staffordshire County CouncilNew | Other | 1 | £650k | 1.7% | 2024-08-14 |
| The Prince's Trust | Other | 1 | £344k | 0.9% | 2021-02-10 |
| Merseyside Fire and Rescue Authority | Other | 1 | £269k | 0.7% | 2022-07-28 |
| West Midlands Fire ServiceNew | Other | 1 | £249k | 0.7% | 2025-07-24 |
| ST HELENS & KNOWSLEY TEACHING HOSPITALS NHS TRUST | Other | 5 | £213k | 0.6% | 2021-08-23 |
| Bath and North East Somerset Council | Other | 1 | £212k | 0.6% | 2023-02-28 |
| ST HELENS & KNOWSLEY TEACHING HOSPITALS NHS TRUST | Other | 4 | £179k | 0.5% | 2021-12-22 |
| NHS North of England CSU | Other | 9 | £170k | 0.5% | 2022-06-10 |
| Valuation Office Agency | Other | 1 | £154k | 0.4% | 2016-04-29 |
| St Helens Council | Other | 1 | £135k | 0.4% | 2023-08-18 |
| NHS Shared Business Services (SBS) | Other | 3 | £132k | 0.4% | 2020-07-02 |
| Cafcass | Other | 1 | £80k | 0.2% | 2023-09-26 |
| MCA - Maritime and Coastguard Agency | Other | 2 | £41k | 0.1% | 2025-06-02 |
| The Charity Commission For England And Wales | Other | 1 | £19k | 0.1% | 2023-02-21 |
| The National Archives | Other | 1 | £13k | 0.0% | 2024-03-13 |
| Big Lottery Fund, operating as The National Lottery Community Fund | Other | 1 | £0k | 0.0% | 2018-10-08 |
| Manchester University NHS Foundation Trust | Other | 1 | £0k | 0.0% | 2021-03-10 |
| London Universities Purchasing Consortium | Other | 4 | £0k | 0.0% | 2017-08-28 |
| The Minister for the Cabinet Office acting through Crown Commercial Service | Other | 2 | £0k | 0.0% | |
| Scottish Government | Other | 4 | £0k | 0.0% | |
| Merseyside Fire & Rescue Service | Other | 1 | £0k | 0.0% | |
| Llywodraeth Cymru / Welsh Government - Commercial Delivery | Other | 2 | £0k | 0.0% | |
| Leeds and York Partnership NHS Foundation Trust, trading as North of England NHS Commercial Procurement Collaborative ("NOE CPC") | Other | 3 | £0k | 0.0% | |
| NHS SHARED BUSINESS SERVICES LIMITED | Other | 3 | £0k | 0.0% | |
| East Suffolk and North Essex NHS Foundation Trust | Other | 1 | £0k | 0.0% | |
| University of the Highlands and Islands | Other | 1 | £0k | 0.0% | |