| National Highways | Other | 297 | £105m | 50.3% | 2025-08-19 |
| City of Bradford Metropolitan District CouncilNew | Other | 1 | £32m | 15.2% | 2025-04-25 |
| Public Health England | Other | 1 | £15m | 7.0% | 2020-12-15 |
| Highways Agency | Other | 3 | £12m | 5.8% | 2017-11-19 |
| DEFRA | Other | 51 | £9m | 4.3% | 2023-01-20 |
| Department for Energy Security & Net ZeroNew | Other | 2 | £6m | 3.0% | 2024-12-09 |
| North of England Commercial Procurement Collaborative | Other | 1 | £5m | 2.5% | 2023-08-03 |
| East Riding of Yorkshire Council | Other | 3 | £4m | 1.8% | 2025-01-08 |
| Birmingham City Council | Other | 4 | £3m | 1.3% | 2024-09-27 |
| DfTc - Department for Transport | Other | 9 | £3m | 1.3% | 2026-04-23 |
| London Borough of Enfield | Other | 1 | £3m | 1.2% | 2018-02-01 |
| North Lincolnshire Council | Other | 2 | £2m | 1.0% | 2023-08-31 |
| Restoration & Renewal Delivery Authority Ltd | Other | 1 | £1m | 0.6% | 2023-10-30 |
| Transport for London | Other | 5 | £1m | 0.5% | 2022-06-07 |
| North London Waste AuthorityNew | Other | 1 | £1m | 0.5% | 2025-12-19 |
| Imperial College HospitalNew | Other | 1 | £710k | 0.3% | 2025-12-05 |
| Magnox Limited | Other | 1 | £670k | 0.3% | 2024-03-01 |
| West Midlands Combined AuthorityNew | Other | 2 | £445k | 0.2% | 2025-07-25 |
| HCC - Resources | Other | 1 | £420k | 0.2% | 2021-08-24 |
| CHESHIRE EAST COUNCIL | Other | 1 | £392k | 0.2% | 2016-05-03 |
| Oxfordshire County Council | Other | 1 | £310k | 0.1% | 2024-01-30 |
| RSSB | Other | 4 | £310k | 0.1% | 2024-05-30 |
| CTM Portal for the NDA Shared Services Alliance | Other | 2 | £302k | 0.1% | 2020-07-31 |
| Homes England (the name adopted by the Homes and Communities Agency)New | Other | 3 | £270k | 0.1% | 2025-11-19 |
| Department for Environment Food & Rural Affairs | Other | 2 | £251k | 0.1% | 2024-01-03 |
| West Yorkshire Combined Authority | Other | 5 | £208k | 0.1% | 2023-09-25 |
| RAIL SAFETY AND STANDARDS BOARD LIMITEDNew | Other | 2 | £200k | 0.1% | 2025-11-13 |
| Department of Health and Social Care (DHSC) | Other | 1 | £198k | 0.1% | 2020-05-11 |
| Wolverhampton City Council | Other | 2 | £198k | 0.1% | 2024-11-22 |
| National Highways Limited | Other | 1 | £198k | 0.1% | 2017-12-10 |
| City of Doncaster Council | Other | 2 | £190k | 0.1% | 2024-05-27 |
| Leeds City Council | Other | 2 | £176k | 0.1% | 2024-10-31 |
| Crown Commercial Service | Other | 2 | £164k | 0.1% | 2017-04-12 |
| Nuclear Restoration Services | Other | 2 | £160k | 0.1% | 2023-03-18 |
| Stockton Borough Council | Other | 1 | £145k | 0.1% | 2023-11-01 |
| Mining Remediation AuthorityNew | Other | 1 | £136k | 0.1% | 2024-10-10 |
| The Water Services Regulation Authority | Other | 2 | £125k | 0.1% | 2020-12-01 |
| TAMESIDE METROPOLITAN BOROUGH COUNCIL | Other | 2 | £100k | 0.0% | 2022-06-01 |
| The Department for Business, Energy and Industrial Strategy (BEIS) | Other | 2 | £96k | 0.0% | 2021-05-14 |
| EAST WEST RAILWAY COMPANY LIMITED | Other | 1 | £90k | 0.0% | 2021-02-04 |
| Epping Forest District Council | Other | 2 | £86k | 0.0% | 2016-04-07 |
| Met Office | Other | 3 | £82k | 0.0% | 2026-04-22 |
| Sellafield LtdNew | Other | 1 | £70k | 0.0% | 2024-10-08 |
| High Speed Two (HS2) Limited | Other | 1 | £70k | 0.0% | 2016-06-02 |
| Stevenage Borough Council - Department Of Community Services | Other | 1 | £68k | 0.0% | 2016-01-15 |
| Offshore Renewable Energy Catapult | Other | 1 | £65k | 0.0% | 2021-07-16 |
| Department for Transport | Other | 4 | £64k | 0.0% | 2019-02-26 |
| East Riding of Yorkshire | Other | 1 | £63k | 0.0% | 2019-09-30 |
| UK SHARED BUSINESS SERVICES LIMITED | Other | 1 | £62k | 0.0% | 2021-09-15 |
| Office for Environmental Protection | Other | 1 | £60k | 0.0% | 2024-01-23 |
| Redcar and Cleveland Borough Council | Other | 1 | £59k | 0.0% | 2019-04-04 |
| Rochdale Metropolitan Borough Council | Other | 1 | £57k | 0.0% | 2022-07-21 |
| Stockton on Tees Borough CouncilNew | Other | 2 | £57k | 0.0% | 2025-05-28 |
| London Borough of Redbridge | Other | 1 | £53k | 0.0% | 2016-11-10 |
| Business Energy and Industrial Strategy | Other | 2 | £50k | 0.0% | 2019-05-15 |
| Luton CouncilNew | Other | 1 | £50k | 0.0% | 2025-01-30 |
| South London and Maudsley | Other | 1 | £50k | 0.0% | 2023-06-21 |
| London Borough of Sutton | Other | 1 | £46k | 0.0% | 2017-08-09 |
| Royal Borough of Kingston Upon Thames | Other | 1 | £40k | 0.0% | 2023-03-20 |
| Tees Valley Combined Authority | Other | 1 | £38k | 0.0% | 2018-06-20 |
| NUCLEAR DECOMMISSIONING AUTHORITYNew | Other | 2 | £36k | 0.0% | 2025-09-04 |
| Ofgem | Other | 2 | £33k | 0.0% | 2020-02-24 |
| Wycombe District Council | Other | 1 | £32k | 0.0% | 2016-04-07 |
| Torbay Council | Other | 1 | £30k | 0.0% | 2022-08-12 |
| Middlesbrough Council | Other | 1 | £30k | 0.0% | 2016-03-15 |
| Radioactive Waste Management Limited | Other | 2 | £30k | 0.0% | 2017-04-03 |
| SOMERSET NHS FOUNDATION TRUST | Other | 1 | £28k | 0.0% | 2023-08-21 |
| Foreign Commonwealth and Development Office | Other | 1 | £18k | 0.0% | 2016-11-02 |
| Liverpool City Council | Other | 1 | £11k | 0.0% | 2020-12-01 |
| THE UNIVERSITY OF BIRMINGHAMNew | Other | 1 | £0k | 0.0% | 2025-12-08 |
| UNIVERSITY OF EAST ANGLIA | Other | 1 | £0k | 0.0% | 2024-05-01 |
| University of Huddersfield e-Tendering | Other | 1 | £0k | 0.0% | 2018-01-10 |
| Lancaster University | Other | 1 | £0k | 0.0% | 2017-12-14 |
| Chesterfield Royal Hospital NHS Foundation Trust | Other | 1 | £0k | 0.0% | 2017-05-12 |
| The Mayor and Commonalty and Citizens of the City of London | Other | 1 | £0k | 0.0% | |
| North of England Commercial Procurement Collaborative (NOE CPC) (hosted by and acting through Leeds and York Partnership NHS Foundation Trust.) | Other | 9 | £0k | 0.0% | |
| Hull City Council | Other | 1 | £0k | 0.0% | |
| DESNZ & DSIT Group Commercial | Other | 2 | £0k | 0.0% | |
| Milton Keynes Council | Other | 1 | £0k | 0.0% | |
| UK Research & Innovation (UKRI) | Other | 2 | £0k | 0.0% | |
| Leeds Teaching Hospitals NHS Trust | Other | 1 | £0k | 0.0% | |
| Department for Business & Trade | Other | 1 | £0k | 0.0% | |
| Crown Estate Scotland | Other | 5 | £0k | 0.0% | |
| Translink | Other | 2 | £0k | 0.0% | |
| Corporate Officer of the House of Commons | Other | 1 | £0k | 0.0% | |
| National Galleries of Scotland | Other | 1 | £0k | 0.0% | |
| Nuclear Waste Services Limited | Other | 1 | £0k | 0.0% | |
| Strategic Investment Board | Other | 1 | £0k | 0.0% | |
| Strathclyde Partnership for Transport | Other | 1 | £0k | 0.0% | |
| NI Water and its subsidiaries | Other | 2 | £0k | 0.0% | |
| CLARION HOUSING GROUP LIMITED | Other | 1 | £0k | 0.0% | |
| Shetland Islands Council | Other | 1 | £0k | 0.0% | |
| Belfast City Council | Other | 1 | £0k | 0.0% | |
| Scottish Borders Council | Other | 1 | £0k | 0.0% | |
| South East of Scotland Transport Partnership (SEStran) | Other | 1 | £0k | 0.0% | |
| Scape Procure Scotland Ltd | Other | 1 | £0k | 0.0% | |