| Government Commercial AgencyNew | Other | 16 | £5.0bn | 31.5% | 2025-09-22 |
| Home Office | Other | 10 | £2.5bn | 15.8% | 2024-09-23 |
| Ministry of Defence | Other | 28 | £2.4bn | 15.2% | 2026-03-23 |
| Ministry of Justice | Other | 14 | £2.2bn | 13.9% | 2025-11-17 |
| Department for Work & Pensions | Other | 17 | £919m | 5.8% | 2021-04-26 |
| Crown Commercial Service | Other | 7 | £843m | 5.3% | 2026-02-09 |
| Department of Health and Social Care (T&T) | Other | 1 | £424m | 2.7% | 2021-06-04 |
| NHS London Procurement Partnership (Hosted by Guy's and St Thomas' NHS FT) | Other | 2 | £322m | 2.0% | 2022-07-06 |
| NHS SHARED BUSINESS SERVICES LIMITEDNew | Other | 2 | £250m | 1.6% | 2025-11-11 |
| Department of Health and Social Care (DHSC) | Other | 3 | £177m | 1.1% | 2020-07-14 |
| London Borough of Lambeth | Other | 1 | £119m | 0.7% | 2021-02-08 |
| Cabinet Office | Other | 3 | £93m | 0.6% | 2019-09-02 |
| Defence Equipment and SupportNew | Other | 4 | £83m | 0.5% | 2025-08-28 |
| ROYAL AIR FORCE | Other | 1 | £68m | 0.4% | 2021-07-07 |
| Derbyshire County Council | Other | 1 | £60m | 0.4% | 2020-02-24 |
| Nottingham City CouncilNew | Other | 2 | £56m | 0.4% | 2024-07-01 |
| BBC (British Broadcasting Corporation)New | Other | 2 | £41m | 0.3% | 2025-04-08 |
| Companies House | Other | 3 | £40m | 0.3% | 2025-07-21 |
| Transport for London | Other | 3 | £40m | 0.3% | 2019-10-21 |
| Sanctuary Housing AssociationNew | Other | 1 | £40m | 0.3% | 2026-03-17 |
| Canterbury City Council | Other | 1 | £40m | 0.3% | 2012-10-01 |
| Skills Funding Agency | Other | 11 | £30m | 0.2% | 2016-12-04 |
| Hertfordshire County Council | Other | 3 | £23m | 0.1% | 2023-10-09 |
| Public Health England | Other | 3 | £15m | 0.1% | 2016-02-28 |
| Department for Education | Other | 9 | £9m | 0.1% | 2026-02-16 |
| London Borough of Richmond Upon Thames | Other | 1 | £6m | 0.0% | 2019-10-14 |
| Basingstoke and Deane Borough Council | Other | 1 | £6m | 0.0% | 2018-02-16 |
| BABCOCK INTERNATIONAL GROUP PLC | Other | 1 | £4m | 0.0% | 2020-02-17 |
| Ministry of Defence, DSG, Defence Support Group (DSG) | Other | 1 | £4m | 0.0% | 2015-02-23 |
| NUCLEAR DECOMMISSIONING AUTHORITYNew | Other | 3 | £4m | 0.0% | 2026-01-30 |
| Greater Manchester Combined Authority - GMP | Other | 1 | £4m | 0.0% | 2021-09-30 |
| Llywodraeth Cymru / Welsh GovernmentNew | Other | 3 | £3m | 0.0% | 2025-06-09 |
| Southampton Solent University | Other | 1 | £2m | 0.0% | 2022-01-27 |
| Department for Business, Energy & Industrial Strategy | Other | 3 | £2m | 0.0% | 2023-05-18 |
| Business Energy and Industrial Strategy | Other | 3 | £2m | 0.0% | 2020-03-20 |
| Atomic Weapons Establishment | Other | 1 | £882k | 0.0% | 2024-04-24 |
| Phil Ralls | Other | 2 | £880k | 0.0% | 2021-01-04 |
| Department for Business & TradeNew | Other | 1 | £600k | 0.0% | 2024-08-13 |
| UK RESEARCH & INNOVATIONNew | Other | 1 | £460k | 0.0% | 2025-02-12 |
| Office for National StatisticsNew | Other | 1 | £413k | 0.0% | 2026-04-24 |
| Great Western Hospitals NHS Foundation Trust Swindon | Other | 1 | £400k | 0.0% | |
| Solent University | Other | 2 | £350k | 0.0% | 2019-07-31 |
| West Bletchley Council | Other | 2 | £219k | 0.0% | 2021-04-09 |
| UK Health Security Agency | Other | 1 | £203k | 0.0% | 2022-01-07 |
| Rushmoor Borough Council | Other | 1 | £190k | 0.0% | 2017-02-02 |
| NORTH TYNESIDE COUNCIL | Other | 1 | £146k | 0.0% | 2020-03-24 |
| Leeds City Council | Other | 1 | £130k | 0.0% | 2020-07-27 |
| Foreign Commonwealth and Development Office | Other | 1 | £120k | 0.0% | 2018-02-26 |
| UK SHARED BUSINESS SERVICES LIMITED | Other | 2 | £112k | 0.0% | 2024-08-09 |
| University of Wolverhampton | Other | 1 | £100k | 0.0% | 2020-02-06 |
| Department for Science, Innovation & TechnologyNew | Other | 2 | £81k | 0.0% | 2025-11-06 |
| Milton Keynes Council Electronic Tendering Site | Other | 1 | £73k | 0.0% | 2017-03-03 |
| UNIVERSITY OF WOLVERHAMPTON ENTERPRISE LIMITEDNew | Other | 1 | £69k | 0.0% | 2024-07-12 |
| MCA - Maritime and Coastguard Agency | Other | 2 | £69k | 0.0% | 2024-10-07 |
| UK Shared Business Services Ltd | Other | 1 | £64k | 0.0% | 2015-07-17 |
| National Highways | Other | 1 | £44k | 0.0% | 2019-09-20 |
| The Charity Commission For England And Wales | Other | 1 | £42k | 0.0% | 2021-03-08 |
| Lincolnshire County Council | Other | 1 | £34k | 0.0% | 2020-08-18 |
| Shared Services Connected Limited | Other | 2 | £23k | 0.0% | 2023-04-18 |
| Ministry of Defence, DIO, | Other | 1 | £17k | 0.0% | 2016-09-30 |
| Independent Office for Police Conduct | Other | 1 | £15k | 0.0% | 2019-07-26 |
| Sandwell Metropolitan Borough Council | Other | 1 | £1k | 0.0% | 2024-05-07 |
| Salisbury NHS Foundation Trust | Other | 1 | £0k | 0.0% | |
| Procurement Services - Lifecycle on behalf of COMMERCIAL SERVICES KENT LIMITED | Other | 1 | £0k | 0.0% | |
| Air Defence & Windfarm Mitigation Systems (ADWiMS) Delivery Team, Defence Equipment & Support, Ministry of Defence | Other | 1 | £0k | 0.0% | |
| Leeds Teaching Hospitals NHS Trust | Other | 2 | £0k | 0.0% | |
| Buckinghamshire Council | Other | 1 | £0k | 0.0% | |
| Transport for Wales | Other | 1 | £0k | 0.0% | |
| UK Research & Innovation | Other | 1 | £0k | 0.0% | |
| The Secretary of State for the Home Department | Other | 1 | £0k | 0.0% | |
| Yorkshire Purchasing Organisation | Other | 1 | £0k | 0.0% | |
| Trafford Council | Other | 1 | £0k | 0.0% | |
| West Midlands Combined Authority | Other | 3 | £0k | 0.0% | |
| UNITED UTILITIES WATER LIMITED | Other | 1 | £0k | 0.0% | |
| UNIVERSITY OF NOTTINGHAM (THE) | Other | 2 | £0k | 0.0% | |
| KBS MARITIME LIMITED | Other | 2 | £0k | 0.0% | |
| Department of Finance | Other | 1 | £0k | 0.0% | |
| The Minister for the Cabinet Office acting through Crown Commercial Service | Other | 2 | £0k | 0.0% | |
| UK Research and Innovation | Other | 2 | £0k | 0.0% | |
| The Common Services Agency (more commonly known as NHS National Services Scotland) (NSS) | Other | 1 | £0k | 0.0% | |