| ANSA ENVIRONMENTAL SERVICES LIMITED | Other | 1 | £5m | 44.5% | 2016-09-28 |
| Oldham Council | Other | 1 | £720k | 6.4% | 2023-04-14 |
| Hampshire County Council | Other | 1 | £355k | 3.2% | 2017-11-21 |
| DERBY CITY COUNCIL | Other | 2 | £200k | 1.8% | 2021-07-26 |
| SE Shared Services | Other | 2 | £189k | 1.7% | 2018-02-27 |
| Knowsley Council | Other | 2 | £187k | 1.7% | 2023-06-14 |
| Derbyshire County Council | Other | 2 | £167k | 1.5% | 2022-01-21 |
| Central Bedfordshire Council | Other | 1 | £165k | 1.5% | 2023-04-21 |
| Stockton Borough Council | Other | 2 | £158k | 1.4% | 2021-12-23 |
| Kent County Council | Other | 1 | £153k | 1.4% | 2022-08-09 |
| East Suffolk CouncilNew | Other | 1 | £152k | 1.4% | 2025-05-02 |
| NHS Business Services AuthorityNew | Other | 1 | £148k | 1.3% | 2026-02-18 |
| Redcar and Cleveland Borough Council | Other | 2 | £144k | 1.3% | 2025-06-20 |
| Crawley Borough Council | Other | 1 | £140k | 1.2% | 2024-03-15 |
| Kirklees Council | Other | 2 | £136k | 1.2% | 2025-02-01 |
| Guildford Borough Council | Other | 1 | £135k | 1.2% | 2022-04-08 |
| Torbay Council | Other | 2 | £133k | 1.2% | 2020-03-24 |
| Great Yarmouth Borough Council | Other | 2 | £125k | 1.1% | 2025-05-01 |
| Bedford Borough CouncilNew | Other | 1 | £120k | 1.1% | 2024-12-09 |
| Wealden District Council | Other | 1 | £120k | 1.1% | 2021-05-28 |
| Bath and North East Somerset Council | Other | 2 | £117k | 1.0% | 2023-09-26 |
| Stoke-on-Trent City Council | Other | 2 | £113k | 1.0% | 2020-03-31 |
| Tewkesbury Borough Council | Other | 2 | £101k | 0.9% | 2022-10-19 |
| Somerset CouncilNew | Other | 1 | £100k | 0.9% | 2025-02-25 |
| Warwickshire County Council | Other | 2 | £97k | 0.9% | 2022-11-25 |
| Folkestone and Hythe District Council | Other | 2 | £94k | 0.8% | 2022-03-01 |
| Liverpool City Council | Other | 2 | £92k | 0.8% | 2025-03-19 |
| Telford & Wrekin Council | Other | 1 | £90k | 0.8% | 2015-10-15 |
| Chichester District Council | Other | 1 | £88k | 0.8% | 2022-05-12 |
| Police and Crime Commissioner for North Wales Police & North Wales Police | Other | 1 | £87k | 0.8% | 2023-02-23 |
| Swale Borough Council | Other | 1 | £85k | 0.8% | 2022-05-20 |
| Surrey Heath Borough CouncilNew | Other | 1 | £80k | 0.7% | 2025-03-04 |
| Rushcliffe Borough Council | Other | 1 | £78k | 0.7% | 2023-09-22 |
| Chelmsford City Council | Other | 1 | £75k | 0.7% | 2017-10-20 |
| Merseyside Waste Disposal AuthorityNew | Other | 2 | £68k | 0.6% | 2025-03-21 |
| Shepway District Council | Other | 1 | £67k | 0.6% | 2016-01-26 |
| Tees Valley Combined Authority | Other | 1 | £66k | 0.6% | 2022-12-15 |
| Wirral Borough Council | Other | 1 | £65k | 0.6% | 2021-03-15 |
| Lichfield District Council | Other | 1 | £65k | 0.6% | 2022-06-15 |
| North Norfolk District Council | Other | 1 | £64k | 0.6% | 2017-03-31 |
| Cambridgeshire and Peterborough Combined Authority | Other | 1 | £62k | 0.6% | 2023-07-31 |
| Canterbury City Council | Other | 1 | £60k | 0.5% | 2017-03-28 |
| Isle of Wight CouncilNew | Other | 1 | £56k | 0.5% | 2024-11-05 |
| Leicestershire PoliceNew | Other | 1 | £55k | 0.5% | 2024-09-09 |
| Suffolk Coastal District Council and Waveney District CouncilNew | Other | 1 | £54k | 0.5% | 2026-03-31 |
| Fylde Borough Council | Other | 1 | £52k | 0.5% | 2023-10-23 |
| Staffordshire County Council | Other | 1 | £50k | 0.4% | 2017-03-29 |
| Newcastle-under-Lyme Borough Council | Other | 1 | £50k | 0.4% | 2022-02-15 |
| London Borough of MertonNew | Other | 1 | £45k | 0.4% | 2026-01-26 |
| North Northamptonshire Council | Other | 2 | £45k | 0.4% | 2022-03-11 |
| Uttlesford District Council | Other | 1 | £44k | 0.4% | 2016-01-01 |
| East Herts District Council | Other | 1 | £41k | 0.4% | 2023-09-29 |
| Suffolk Sourcing | Other | 1 | £41k | 0.4% | 2018-11-20 |
| Lancashire ConstabularyNew | Other | 1 | £40k | 0.4% | 2024-06-19 |
| North East Derbyshire District Council - e-Tendering SystemNew | Other | 1 | £40k | 0.4% | 2025-08-07 |
| Manchester City Council | Other | 1 | £37k | 0.3% | 2021-01-25 |
| London Borough of Southwark | Other | 1 | £36k | 0.3% | 2016-01-06 |
| Redditch Borough CouncilNew | Other | 1 | £32k | 0.3% | 2025-06-05 |
| London Borough of Enfield | Other | 1 | £25k | 0.2% | 2023-08-31 |
| Bolsover District Council | Other | 1 | £25k | 0.2% | 2019-08-23 |
| Cambridgeshire County Council | Other | 1 | £20k | 0.2% | 2020-11-27 |
| Surrey County Council | Other | 1 | £0k | 0.0% | 2021-12-14 |
| Coventry - Solihull - Warwickshire | Other | 1 | £0k | 0.0% | 2019-03-13 |
| GO Shared Services | Other | 1 | £0k | 0.0% | 2018-01-29 |
| Chesterfield Royal Hospital NHS Foundation Trust | Other | 1 | £0k | 0.0% | 2016-09-06 |
| The City of Edinburgh Council | Other | 1 | £0k | 0.0% | |
| Tameside Council | Other | 1 | £0k | 0.0% | |
| Norwich City Council | Other | 1 | £0k | 0.0% | |
| Dartford Borough Council | Other | 1 | £0k | 0.0% | |
| Worcester City Council | Other | 1 | £0k | 0.0% | |
| North East Lincolnshire Borough Council | Other | 1 | £0k | 0.0% | |
| London Borough of Sutton | Other | 1 | £0k | 0.0% | |
| Wirral Council | Other | 1 | £0k | 0.0% | |