| National Highways | Other | 19 | £182m | 30.1% | 2022-06-27 |
| Ministry of Defence | Other | 14 | £136m | 22.5% | 2025-07-02 |
| Derbyshire County Council | Other | 3 | £80m | 13.3% | 2023-08-22 |
| YORKSHIRE WATER SERVICES LIMITEDNew | Other | 2 | £32m | 5.3% | 2025-02-02 |
| DfTc - Department for Transport | Other | 21 | £26m | 4.2% | 2026-03-31 |
| Kent County Council | Other | 4 | £16m | 2.7% | 2021-09-03 |
| Bristol City CouncilNew | Other | 1 | £15m | 2.5% | 2025-12-12 |
| GREAT BRITISH ENERGY - NUCLEARNew | Other | 3 | £14m | 2.3% | 2026-02-24 |
| Homes England (the name adopted by the Homes and Communities Agency) | Other | 4 | £10m | 1.7% | 2023-04-18 |
| National Highways LimitedNew | Other | 2 | £10m | 1.6% | 2025-12-09 |
| Lancashire County Council | Other | 1 | £8m | 1.3% | 2021-04-14 |
| Manchester City Council | Other | 1 | £8m | 1.2% | 2016-12-06 |
| International Nuclear Services Limited | Other | 15 | £7m | 1.1% | 2026-02-19 |
| Department for Energy Security & Net ZeroNew | Other | 2 | £6m | 1.0% | 2025-12-11 |
| Brighton and Hove City CouncilNew | Other | 1 | £6m | 1.0% | 2025-10-10 |
| Warrington Borough Council | Other | 1 | £6m | 0.9% | 2018-05-01 |
| ANGLIAN WATER SERVICES LIMITEDNew | Other | 1 | £4m | 0.7% | 2026-03-05 |
| Ministry of Housing, Communities & Local GovernmentNew | Other | 1 | £4m | 0.7% | 2025-02-25 |
| Wolverhampton City Council | Other | 2 | £4m | 0.6% | 2019-03-31 |
| Cumbria County Council | Other | 22 | £4m | 0.6% | 2023-02-16 |
| GREATER MANCHESTER EDUCATION TRUSTNew | Other | 2 | £3m | 0.5% | 2025-04-15 |
| Espo | Other | 10 | £3m | 0.4% | 2021-08-22 |
| DEPARTMENT FOR LEVELLING UP, HOUSING AND COMMUNITIES | Other | 1 | £2m | 0.4% | 2022-07-15 |
| Birmingham City Council | Other | 20 | £2m | 0.3% | 2025-07-29 |
| NUCLEAR DECOMMISSIONING AUTHORITY | Other | 8 | £1m | 0.2% | 2024-02-06 |
| EAST WEST RAILWAY COMPANY LIMITED | Other | 1 | £1m | 0.2% | 2023-05-04 |
| Dounreay a division of Magnox Limited | Other | 3 | £1m | 0.2% | 2024-02-05 |
| Department for TransportNew | Other | 1 | £1m | 0.2% | 2026-04-08 |
| Durham County Council | Other | 5 | £1m | 0.2% | 2025-12-10 |
| United Kingdom Atomic Energy Authority | Other | 3 | £1m | 0.2% | 2020-04-17 |
| West Yorkshire Combined Authority | Other | 10 | £973k | 0.2% | 2025-10-13 |
| Transport for London | Other | 3 | £792k | 0.1% | 2026-02-23 |
| Nuclear Waste Services Ltd | Other | 3 | £697k | 0.1% | 2023-08-31 |
| HS2 | Other | 2 | £690k | 0.1% | 2021-07-02 |
| Cumberland Council | Other | 8 | £667k | 0.1% | 2025-07-10 |
| Tees Valley Combined AuthorityNew | Other | 2 | £500k | 0.1% | 2024-08-10 |
| LLWR | Other | 3 | £461k | 0.1% | 2024-03-08 |
| Hampshire County Council | Other | 9 | £406k | 0.1% | 2026-03-24 |
| North Yorkshire County Council | Other | 1 | £400k | 0.1% | 2021-04-06 |
| Ofgem | Other | 3 | £346k | 0.1% | 2022-09-01 |
| Isle of Wight Council | Other | 2 | £329k | 0.1% | 2021-06-09 |
| Nuclear Restoration Services LimitedNew | Other | 2 | £323k | 0.1% | 2024-08-01 |
| Cambridgeshire District Councils | Other | 1 | £293k | 0.0% | 2019-11-28 |
| East Sussex County Council | Other | 2 | £269k | 0.0% | 2023-12-05 |
| Dounreay | Other | 2 | £259k | 0.0% | 2024-02-12 |
| Sellafield Ltd | Other | 6 | £254k | 0.0% | 2024-10-30 |
| Sellafield Limited | Other | 2 | £253k | 0.0% | 2024-09-23 |
| O F W A T | Other | 4 | £251k | 0.0% | 2023-01-23 |
| Westmorland and Furness Council | Other | 3 | £246k | 0.0% | 2025-09-08 |
| Cambridgeshire County Council | Other | 1 | £206k | 0.0% | 2024-04-30 |
| NRS DounreayNew | Other | 2 | £203k | 0.0% | 2025-02-24 |
| Business Energy and Industrial Strategy | Other | 2 | £192k | 0.0% | 2021-07-28 |
| Department for Education | Other | 2 | £189k | 0.0% | 2022-02-07 |
| Magnox Ltd | Other | 1 | £141k | 0.0% | 2023-07-25 |
| Civil Aviation Authority | Other | 5 | £136k | 0.0% | 2021-03-06 |
| Norfolk County CouncilNew | Other | 2 | £127k | 0.0% | 2026-01-21 |
| Oxfordshire County CouncilNew | Other | 1 | £99k | 0.0% | 2025-08-08 |
| Ministry of Justice | Other | 2 | £96k | 0.0% | 2017-01-30 |
| Nuclear Restoration Services Limited (Dounreay)New | Other | 1 | £96k | 0.0% | 2024-10-02 |
| Nuclear Restoration ServicesNew | Other | 1 | £90k | 0.0% | 2024-07-25 |
| capitalEsourcing | Other | 1 | £88k | 0.0% | 2024-02-21 |
| Norse Commercial Services LtdNew | Other | 1 | £87k | 0.0% | 2025-05-16 |
| Peterborough City Council | Other | 1 | £82k | 0.0% | 2021-07-06 |
| Stockton Borough Council | Other | 1 | £80k | 0.0% | 2023-10-01 |
| Cambridgeshire and Peterborough Combined AuthorityNew | Other | 1 | £57k | 0.0% | 2024-09-18 |
| The Crown Estate | Other | 1 | £55k | 0.0% | 2024-01-07 |
| North Lincolnshire Council | Other | 1 | £49k | 0.0% | 2021-04-08 |
| Cheshire West and Chester Council | Other | 1 | £45k | 0.0% | 2022-12-21 |
| Greater Manchester Combined Authority - GMP | Other | 1 | £45k | 0.0% | 2023-11-01 |
| LLW Repository | Other | 1 | £44k | 0.0% | 2023-01-27 |
| LLWR t/a NWS | Other | 1 | £43k | 0.0% | 2022-11-23 |
| Weymouth & Portland Borough Council | Other | 1 | £42k | 0.0% | 2018-09-28 |
| The Water Services Regulation Authority | Other | 1 | £40k | 0.0% | 2022-01-26 |
| City of Doncaster CouncilNew | Other | 1 | £38k | 0.0% | 2025-06-25 |
| Tees Valley Combined Authority Group, and Teesside International Airport | Other | 1 | £37k | 0.0% | 2022-11-30 |
| Magnox Limited | Other | 1 | £29k | 0.0% | 2024-03-27 |
| Kingston Upon Hull City Council | Other | 1 | £26k | 0.0% | 2021-06-24 |
| West Midlands Combined Authority | Other | 2 | £0k | 0.0% | 2021-03-16 |
| MAG AIRPORT LIMITED | Other | 5 | £0k | 0.0% | |
| East Suffolk Council | Other | 1 | £0k | 0.0% | |
| NATIONAL GRID UK LIMITED | Other | 1 | £0k | 0.0% | |
| Department for Environment Food & Rural Affairs | Other | 2 | £0k | 0.0% | |
| DESNZ & DSIT Group Commercial | Other | 4 | £0k | 0.0% | |
| SEVERN TRENT WATER LIMITED | Other | 1 | £0k | 0.0% | |
| Wealden District Council | Other | 1 | £0k | 0.0% | |
| NATIONAL GRID ELECTRICITY TRANSMISSION PLC | Other | 1 | £0k | 0.0% | |
| THAMES WATER UTILITIES LIMITED | Other | 4 | £0k | 0.0% | |
| Radioactive Waste Management Limited | Other | 1 | £0k | 0.0% | |
| Peel Ports Investments Limited | Other | 1 | £0k | 0.0% | |
| The Association of North East Councils Limited | Other | 1 | £0k | 0.0% | |
| Transport Scotland | Other | 1 | £0k | 0.0% | |
| ENVIRONMENT AGENCY (Defra Network eTendering Portal) | Other | 4 | £0k | 0.0% | |
| South Lakeland District Council | Other | 2 | £0k | 0.0% | |
| Blackpool Council | Other | 1 | £0k | 0.0% | |
| Hertfordshire County Council | Other | 1 | £0k | 0.0% | |
| Environment Agency | Other | 1 | £0k | 0.0% | |
| Worcestershire County Council | Other | 2 | £0k | 0.0% | |
| Dounreay Site Restoration Limited | Other | 1 | £0k | 0.0% | |
| Coventry City Council | Other | 1 | £0k | 0.0% | |
| ASSOCIATED BRITISH PORTS | Other | 2 | £0k | 0.0% | |
| NORTHUMBRIAN WATER LIMITED | Other | 1 | £0k | 0.0% | |
| The Minister for the Cabinet Office acting through Crown Commercial Service | Other | 1 | £0k | 0.0% | |
| Scotland Excel | Other | 5 | £0k | 0.0% | |
| Portsmouth Water Limited | Other | 1 | £0k | 0.0% | |
| Oil and Pipelines Agency | Other | 2 | £0k | 0.0% | |
| Liverpool City Region Combined Authority | Other | 3 | £0k | 0.0% | |