| Department for Work & Pensions | Other | 3 | £9m | 23.8% | 2022-10-28 |
| YPO | Other | 1 | £6m | 17.1% | 2019-09-20 |
| HM Revenue & Customs | Other | 1 | £4m | 9.7% | 2019-04-14 |
| H M REVENUE & CUSTOMS | Other | 1 | £4m | 9.3% | 2023-08-15 |
| THE GUINNESS PARTNERSHIP LIMITED | Other | 3 | £2m | 6.4% | 2019-01-03 |
| Met Office | Other | 7 | £2m | 5.7% | 2025-03-10 |
| Gloucestershire County Council | Other | 1 | £1m | 3.0% | 2023-10-04 |
| Colchester City Council | Other | 1 | £1m | 2.8% | 2022-07-04 |
| Crown Commercial Service | Other | 3 | £878k | 2.3% | 2021-12-14 |
| Coventry City Council | Other | 1 | £840k | 2.2% | 2020-04-07 |
| Folkestone and Hythe District Council | Other | 1 | £703k | 1.9% | 2018-09-19 |
| Shropshire Council | Other | 1 | £600k | 1.6% | 2016-12-19 |
| HM Land Registry | Other | 2 | £486k | 1.3% | 2019-06-02 |
| Derbyshire Dales District Council | Other | 1 | £445k | 1.2% | 2020-12-14 |
| Department for Education | Other | 2 | £444k | 1.2% | 2025-07-24 |
| St Helens Council | Other | 1 | £261k | 0.7% | 2017-06-21 |
| UKHSANew | Other | 2 | £227k | 0.6% | 2025-06-11 |
| UNIVERSITY OF GLOUCESTERSHIRE | Other | 1 | £224k | 0.6% | 2021-07-10 |
| Ofsted | Other | 1 | £213k | 0.6% | 2022-10-07 |
| Competition and Markets Authority | Other | 1 | £209k | 0.6% | 2022-12-16 |
| National Audit Office | Other | 2 | £178k | 0.5% | 2023-03-20 |
| The Water Services Regulation Authority | Other | 1 | £174k | 0.5% | 2017-02-13 |
| General Dental Council | Other | 1 | £168k | 0.4% | 2018-06-04 |
| Food Standards Agency | Other | 3 | £145k | 0.4% | 2025-01-23 |
| Staffordshire County Council | Other | 1 | £140k | 0.4% | 2020-07-28 |
| ADVISORY, CONCILIATION AND ARBITRATION SERVICE | Other | 1 | £132k | 0.3% | 2021-10-14 |
| Harborough District Council | Other | 2 | £132k | 0.3% | 2020-07-31 |
| Trafford Council | Other | 1 | £128k | 0.3% | 2016-08-25 |
| Devon & Somerset Fire & Rescue Service | Other | 1 | £127k | 0.3% | 2016-09-01 |
| Public Health England | Other | 1 | £121k | 0.3% | 2019-03-21 |
| National Highways Limited | Other | 1 | £117k | 0.3% | 2019-07-25 |
| Manchester City Council | Other | 1 | £110k | 0.3% | 2019-04-18 |
| UNIVERSITY OF SOUTHAMPTON | Other | 1 | £105k | 0.3% | 2020-02-19 |
| Ministry of Housing, Communities & Local Government | Other | 1 | £101k | 0.3% | 2020-12-13 |
| Hertfordshire NHS Procurement | Other | 1 | £100k | 0.3% | 2019-11-19 |
| COLLEGE OF POLICING LIMITED | Other | 1 | £99k | 0.3% | 2022-11-22 |
| University Of The West Of England | Other | 2 | £90k | 0.2% | 2023-06-27 |
| Police, Fire & Crime Commissioner for StaffordshireNew | Other | 1 | £84k | 0.2% | 2025-07-24 |
| Westmorland and Furness CouncilNew | Other | 1 | £69k | 0.2% | 2025-07-10 |
| The Insolvency Service | Other | 1 | £61k | 0.2% | 2020-03-20 |
| NEL Commissioning Support Unit | Other | 1 | £60k | 0.2% | 2021-11-12 |
| MANCHESTER CENTRAL CONVENTION COMPLEX LIMITED | Other | 1 | £60k | 0.2% | 2019-12-23 |
| Hull University Teaching Hospitals NHS Trust | Other | 1 | £59k | 0.2% | 2021-08-20 |
| UNIVERSITY OF SUSSEX(THE) | Other | 1 | £54k | 0.1% | 2023-02-28 |
| THE EXTRACARE CHARITABLE TRUST | Other | 1 | £50k | 0.1% | 2022-06-06 |
| Redditch Borough & Bromsgrove District Councils | Other | 1 | £50k | 0.1% | 2019-09-23 |
| Ministry of Justice | Other | 1 | £33k | 0.1% | 2021-06-11 |
| SE Shared Services | Other | 1 | £32k | 0.1% | 2016-08-01 |
| Newcastle University | Other | 1 | £30k | 0.1% | 2020-08-26 |
| North Kesteven District Council | Other | 1 | £26k | 0.1% | 2023-03-22 |
| Home Office | Other | 2 | £25k | 0.1% | 2023-01-01 |
| MCA - Maritime and Coastguard Agency | Other | 1 | £11k | 0.0% | 2024-02-08 |
| Central Bedfordshire Council | Other | 1 | £0k | 0.0% | 2022-03-29 |
| Lee Valley Regional Park Authority | Other | 1 | £0k | 0.0% | 2019-09-27 |
| Board of Trustees of the Royal Botanic Gardens Kew | Other | 1 | £0k | 0.0% | 2019-03-28 |
| Wolverhampton City Council | Other | 1 | £0k | 0.0% | 2017-07-03 |
| Workers Educational Association | Other | 1 | £0k | 0.0% | 2016-10-20 |
| Sheffield Hallam University | Other | 1 | £0k | 0.0% | 2016-02-18 |
| Scottish Government | Other | 1 | £0k | 0.0% | |
| NHS Wales Shared Services Partnership (hosted by Velindre University NHS Trust) | Other | 1 | £0k | 0.0% | |
| Kent County Council (t/a KCS) | Other | 1 | £0k | 0.0% | |