| EN Procure Ltd | Other | 2 | £42m | 11.5% | 2021-01-17 |
| Highways Agency | Other | 24 | £31m | 8.5% | 2017-11-26 |
| Homes England (the name adopted by the Homes and Communities Agency) | Other | 48 | £30m | 8.4% | 2026-01-19 |
| National Highways | Other | 25 | £28m | 7.6% | 2025-10-22 |
| Department for Education | Other | 6 | £27m | 7.5% | 2026-01-29 |
| THE GUINNESS PARTNERSHIP LIMITEDNew | Other | 3 | £25m | 6.9% | 2025-11-28 |
| Hyde Housing Association Ltd | Other | 2 | £22m | 6.2% | 2024-05-20 |
| Environment Agency | Other | 63 | £19m | 5.4% | 2026-04-28 |
| UK Research and InnovationNew | Other | 3 | £19m | 5.3% | 2025-12-15 |
| National Highways Limited | Other | 10 | £16m | 4.4% | 2026-03-25 |
| Bristol City CouncilNew | Other | 2 | £11m | 2.9% | 2025-07-10 |
| Westminster City CouncilNew | Other | 1 | £9m | 2.4% | 2025-06-02 |
| Transport for London | Other | 6 | £8m | 2.3% | 2025-08-04 |
| DEFRA | Other | 55 | £8m | 2.2% | 2026-03-24 |
| Department for Energy Security & Net ZeroNew | Other | 3 | £6m | 1.7% | 2024-12-12 |
| Ministry of Defence | Other | 12 | £5m | 1.5% | 2026-03-13 |
| West Yorkshire Combined Authority | Other | 2 | £5m | 1.4% | 2023-04-24 |
| Birmingham City Council | Other | 6 | £5m | 1.3% | 2025-06-20 |
| East Riding of Yorkshire CouncilNew | Other | 2 | £4m | 1.0% | 2025-01-08 |
| GREATER MANCHESTER EDUCATION TRUSTNew | Other | 4 | £3m | 0.8% | 2025-04-15 |
| Leicester City Council | Other | 6 | £3m | 0.7% | 2024-11-26 |
| Liverpool City Council | Other | 4 | £3m | 0.7% | 2026-02-23 |
| SSE plc | Other | 2 | £3m | 0.7% | 2021-08-02 |
| Tees Valley Combined Authority | Other | 7 | £2m | 0.7% | 2025-08-19 |
| Nuclear Restoration Services LtdNew | Other | 2 | £2m | 0.6% | 2025-11-18 |
| British Museum | Other | 3 | £2m | 0.6% | 2021-05-14 |
| BANK OF ENGLANDNew | Other | 1 | £2m | 0.6% | 2025-07-03 |
| DERBY CITY COUNCIL | Other | 6 | £2m | 0.5% | 2026-03-31 |
| Leicestershire County Council | Other | 1 | £2m | 0.4% | 2017-09-10 |
| HS2 | Other | 5 | £2m | 0.4% | 2024-04-05 |
| Shepway District Council | Other | 1 | £1m | 0.4% | 2016-07-19 |
| West Hertfordshire Hospitals NHS Trust | Other | 6 | £1m | 0.4% | 2025-07-10 |
| Homes England | Other | 1 | £1m | 0.4% | 2020-06-10 |
| EA | Other | 6 | £1m | 0.3% | 2024-01-02 |
| West Midlands Combined Authority | Other | 10 | £1m | 0.3% | 2025-10-21 |
| UNIVERSITY OF SOUTHAMPTONNew | Other | 3 | £980k | 0.3% | 2024-11-27 |
| Swindon Borough Council | Other | 1 | £785k | 0.2% | 2023-09-27 |
| Driver and Vehicle Licensing AgencyNew | Other | 2 | £718k | 0.2% | 2025-12-04 |
| Halton Borough Council | Other | 7 | £668k | 0.2% | 2024-07-24 |
| Department of Health & Social Care | Other | 2 | £522k | 0.1% | 2020-11-06 |
| UK Atomic Energy AuthorityNew | Other | 1 | £500k | 0.1% | 2026-05-07 |
| West Hertfordshire Teaching Hospitals NHS TrustNew | Other | 5 | £488k | 0.1% | 2026-05-20 |
| Hyndburn Borough CouncilNew | Other | 3 | £480k | 0.1% | 2025-08-04 |
| Notting Hill Genesis | Other | 2 | £458k | 0.1% | 2022-06-09 |
| Bromsgrove District Council | Other | 2 | £382k | 0.1% | 2024-11-04 |
| Wolverhampton City Council | Other | 3 | £324k | 0.1% | 2026-01-02 |
| Department for Environment Food & Rural AffairsNew | Other | 2 | £315k | 0.1% | 2025-10-10 |
| UKRINew | Other | 1 | £275k | 0.1% | 2025-11-21 |
| South Tees Development CorporationNew | Other | 1 | £250k | 0.1% | 2025-05-20 |
| SALIX FINANCE LTDNew | Other | 1 | £233k | 0.1% | 2026-04-16 |
| FCDO Services | Other | 1 | £210k | 0.1% | |
| Defence Infrastructure Organisation | Other | 1 | £200k | 0.1% | 2024-04-16 |
| SOUTH YORKSHIRE PASSENGER TRANSPORT EXECUTIVE | Other | 1 | £180k | 0.0% | 2019-08-12 |
| Staffordshire County Council | Other | 2 | £167k | 0.0% | 2024-01-24 |
| Metropolitan Police Service | Other | 1 | £148k | 0.0% | 2022-02-28 |
| Homes and Communities Agency | Other | 2 | £144k | 0.0% | 2017-09-05 |
| DfTc - Department for TransportNew | Other | 1 | £144k | 0.0% | 2026-02-13 |
| Kirklees Council | Other | 3 | £140k | 0.0% | 2024-03-05 |
| Civil Aviation Authority | Other | 6 | £136k | 0.0% | 2021-03-06 |
| Derbyshire Dales District CouncilNew | Other | 1 | £109k | 0.0% | 2025-06-10 |
| H M REVENUE & CUSTOMS | Other | 1 | £100k | 0.0% | 2023-04-24 |
| Buckinghamshire Council | Other | 1 | £92k | 0.0% | 2018-10-01 |
| Platform Housing GroupNew | Other | 1 | £89k | 0.0% | 2024-11-12 |
| London Borough of Merton | Other | 1 | £86k | 0.0% | 2024-03-08 |
| City of London Corporation | Other | 1 | £84k | 0.0% | 2023-12-01 |
| Bradford Teaching Hospitals NHS Foundation TrustNew | Other | 2 | £81k | 0.0% | 2025-08-14 |
| Coventry City Council | Other | 2 | £79k | 0.0% | 2024-11-30 |
| Barnsley, Doncaster, Rotherham and Sheffield Combined Authority | Other | 1 | £74k | 0.0% | 2020-05-06 |
| Nuclear Restoration Services LimitedNew | Other | 1 | £74k | 0.0% | 2025-09-17 |
| Cambridgeshire County Council | Other | 1 | £70k | 0.0% | 2019-02-12 |
| Cabinet Office | Other | 1 | £69k | 0.0% | 2024-05-17 |
| Sheffield City Council | Other | 1 | £67k | 0.0% | 2018-09-07 |
| Lower Medway Internal Drainage BoardNew | Other | 1 | £66k | 0.0% | 2025-07-29 |
| Offshore Renewable Energy Catapult | Other | 1 | £66k | 0.0% | 2022-09-29 |
| Walsall Council e-Tendering | Other | 2 | £63k | 0.0% | 2019-06-06 |
| CafcassNew | Other | 1 | £62k | 0.0% | 2025-10-31 |
| Wyre CouncilNew | Other | 1 | £62k | 0.0% | 2025-03-31 |
| University of PortsmouthNew | Other | 1 | £60k | 0.0% | 2024-11-16 |
| Nottingham City Council | Other | 1 | £60k | 0.0% | 2023-05-18 |
| London Borough of Enfield | Other | 1 | £60k | 0.0% | 2019-03-27 |
| Surrey and Borders Partnership NHS Foundation TrustNew | Other | 1 | £52k | 0.0% | 2025-02-03 |
| NHS Arden and GEM CSU | Other | 1 | £52k | 0.0% | 2022-01-05 |
| Foreign Commonwealth and Development OfficeNew | Other | 1 | £52k | 0.0% | 2024-08-08 |
| Welland ProcurementNew | Other | 1 | £51k | 0.0% | 2024-12-02 |
| Chelmsford City Council | Other | 1 | £50k | 0.0% | 2023-08-07 |
| Home OfficeNew | Other | 1 | £50k | 0.0% | 2025-07-28 |
| Darlington Borough Council | Other | 1 | £48k | 0.0% | 2017-08-31 |
| Suffolk Sourcing | Other | 1 | £41k | 0.0% | 2020-03-17 |
| Rochford District CouncilNew | Other | 1 | £41k | 0.0% | 2026-02-09 |
| Southampton Solent University | Other | 1 | £38k | 0.0% | 2022-03-11 |
| University of Bristol | Other | 1 | £36k | 0.0% | 2024-03-01 |
| The Birmingham Organising Committee for the 2022 Commonwealth Games Ltd | Other | 1 | £35k | 0.0% | 2020-04-15 |
| Mining Remediation AuthorityNew | Other | 1 | £31k | 0.0% | 2026-01-23 |
| Suffolk County Council | Other | 1 | £31k | 0.0% | 2022-08-04 |
| Devon County Council | Other | 1 | £27k | 0.0% | 2017-09-11 |
| Royal Borough of Kensington & Chelsea | Other | 1 | £27k | 0.0% | 2016-07-01 |
| The West of England Combined AuthorityNew | Other | 1 | £25k | 0.0% | 2024-12-09 |
| Epping Forest District Council | Other | 1 | £25k | 0.0% | 2018-06-26 |
| Department for Transport | Other | 1 | £20k | 0.0% | 2019-02-18 |
| Ofgem | Other | 1 | £17k | 0.0% | 2018-06-01 |
| Competition and Markets Authority | Other | 1 | £16k | 0.0% | 2020-08-03 |
| L&Q Construction | Other | 1 | £16k | 0.0% | 2020-04-16 |
| Ministry of Housing, Communities & Local GovernmentNew | Other | 1 | £14k | 0.0% | 2025-06-19 |
| PLATFORM HOUSING LIMITEDNew | Other | 1 | £0k | 0.0% | 2026-04-13 |
| Kingston University Higher Education CorporationNew | Other | 1 | £0k | 0.0% | 2026-04-02 |
| TranslinkNew | Other | 4 | £0k | 0.0% | 2026-03-26 |
| SEVERN TRENT WATER LIMITEDNew | Other | 1 | £0k | 0.0% | 2026-03-13 |
| Leicestershire County Council, trading as ESPONew | Other | 18 | £0k | 0.0% | 2026-01-08 |
| Port of DoverNew | Other | 1 | £0k | 0.0% | 2025-10-15 |
| Hertfordshire County Council - Environment | Other | 1 | £0k | 0.0% | 2023-08-17 |
| Blackpool Council | Other | 1 | £0k | 0.0% | 2021-02-02 |
| Wigan Council | Other | 1 | £0k | 0.0% | 2020-12-02 |
| The Coal Authority | Other | 1 | £0k | 0.0% | 2019-08-01 |
| SE Shared Services | Other | 1 | £0k | 0.0% | 2019-01-09 |
| Natural Resources Wales | Other | 2 | £0k | 0.0% | |
| The Mayor and Commonalty and Citizens of the City of London | Other | 1 | £0k | 0.0% | |
| New Forest District Council | Other | 1 | £0k | 0.0% | |
| Neath Port Talbot County Borough Council | Other | 3 | £0k | 0.0% | |
| Manchester City Council | Other | 1 | £0k | 0.0% | |
| DESNZ & DSIT Group Commercial | Other | 3 | £0k | 0.0% | |
| Network Rail Infrastructure Ltd | Other | 4 | £0k | 0.0% | |
| Strathclyde Partnership for Transport | Other | 4 | £0k | 0.0% | |
| Transport for Wales | Other | 2 | £0k | 0.0% | |
| City of Bradford Metropolitan District Council | Other | 1 | £0k | 0.0% | |
| LHC Procurement Group Limited for the Welsh Procurement Alliance (WPA) | Other | 4 | £0k | 0.0% | |
| Cyngor Gwynedd | Other | 1 | £0k | 0.0% | |
| UNITED UTILITIES WATER LIMITED | Other | 2 | £0k | 0.0% | |
| Scotland Excel | Other | 6 | £0k | 0.0% | |
| Kent County Council | Other | 1 | £0k | 0.0% | |
| Tyne and Wear Passenger Transport Executive T/A Nexus | Other | 1 | £0k | 0.0% | |
| GREAT BRITISH ENERGY - NUCLEAR | Other | 1 | £0k | 0.0% | |
| Welsh Government - Commercial Delivery | Other | 1 | £0k | 0.0% | |
| Walsall Council | Other | 1 | £0k | 0.0% | |
| Canal & River Trust | Other | 1 | £0k | 0.0% | |
| Scape Procure Limited | Other | 1 | £0k | 0.0% | |
| THAMES WATER UTILITIES LIMITED | Other | 3 | £0k | 0.0% | |
| Northern Trains Limited | Other | 1 | £0k | 0.0% | |
| LHC Procurement Group Limited | Other | 1 | £0k | 0.0% | |
| Cardiff Council | Other | 6 | £0k | 0.0% | |
| NPL Management Limited | Other | 1 | £0k | 0.0% | |
| Llywodraeth Cymru / Welsh Government | Other | 1 | £0k | 0.0% | |
| Cambridgeshire and Peterborough Combined Authority | Other | 1 | £0k | 0.0% | |
| The Council of the Borough of Kirklees | Other | 1 | £0k | 0.0% | |
| WAKEFIELD COUNCIL | Other | 1 | £0k | 0.0% | |
| NORTHUMBRIAN WATER LIMITED | Other | 1 | £0k | 0.0% | |
| British Library Board | Other | 1 | £0k | 0.0% | |
| Scape Procure Scotland Ltd | Other | 1 | £0k | 0.0% | |
| Greater Manchester Combined Authority - GMP | Other | 1 | £0k | 0.0% | |