| C. DOE & Co. (Clacton) Recycling Limited | Clacton-On-Sea | 1968 |
| C. Soar & Sons (UK) Limited | Stairfoot Barnsley | 2003 |
| C. Soar & Sons Holdings Limited | Barnsley | 2021 |
| C.A.K Waste Ltd | Mansfield | 2024 |
| C.A.L.T Enterprises Limited | Crawley | 2013 |
| C.B. Environmental Ltd. | Ceredigion | 1998 |
| C.Bialek Limited | Salisbury | 1962 |
| C.C. Haulage and Sons Limited | Devon | 2002 |
| C.D. Waste Management Limited | London | 1999 |
| C.E.Walton & Co.Limited | Tamworth | 1965 |
| C.F. Booth (Doncaster) Limited | Leeds | 1980 |
| C.F. Gill& SON Limited | Peterborough | 1962 |
| C.G Catalytic Converters Ltd | London | 2026 |
| C.G. Comley & Sons Limited | Southampton | 1982 |
| C.H.Middleton Limited | | 1959 |
| C.K.G. Contracts Limited | Essex | 1989 |
| C.L. Prosser & Co. Limited | London | 1957 |
| C.L. RYE Trading Limited | Newton Abbot | 2000 |
| C.Removal Ltd | London | 2025 |
| C.S. Furniture Limited | 25-31 Tavistock Place | 1993 |
| C.T.E Waste Limited | Wednesbury | 2010 |
| C.Traffs Ltd | Manchester | 2026 |
| C1CLEARANCE Limited | Stockport | 2025 |
| C4 Plus Drainage Ltd | Redhill | 2019 |
| CAB Polymers Limited | Salford | 2016 |
| CAB Recycling Ltd | Newcastle Upon Tyne | 2021 |
| Cabbot Clean UP Ltd | Bristol | 2025 |
| Cabezo CS Ltd | Belfast | 2021 |
| Cable Giants Ltd | Herne Bay | 2019 |
| Cable Processing UK Ltd | Salisbury | 2025 |
| Cable Wire Recycling Ltd | Birmingahm | 2021 |
| Cactus AF Ltd | Royal Victoria Docks | 2019 |
| Cadar Limited | Market Harborough | 1985 |
| Caddy Couriers + Ltd | Coventry | 2025 |
| Cadman House Clearances Ltd | Wigan | 2021 |
| Cadman Rubbish Removals Limited | Wigan | 2018 |
| Caerphilly Skip Hire (CWS) Ltd | Caerphilly | 2009 |
| Caesar Drainage Services Ltd. | Poole | 2025 |
| Caesars Removals Ltd | Leeds | 2025 |
| Cage Waste Removal Limited | Ashford | 2024 |
| Cagenut Ltd | Axminster | 2024 |
| Caird Peckfield Limited | Leeds | 1989 |
| Cairngorm Domestic Cleaning Ltd | Aviemore | 2020 |
| Caistor Logistics Limited | Hartlepool | 2014 |
| Caja Verde Limited | Maidstone | 2017 |
| Calator Prin Lume Ltd | Luton | 2024 |
| Calder Remediation Ltd | Rotherham | 2022 |
| Calder Services Limited | Rayleigh | 2005 |
| Calderdale Norse Limited | Norwich | 2025 |
| Calderdale Sewer Services Limited | Ovenden Halifax | 2000 |
| Caledonia Containers Ltd | Glasgow | 2022 |
| Caledonia ELT Recycling Ltd | Glasgow | 2023 |
| Caledonia Waste Ltd | Airdrie | 2020 |
| Caledonia Waste Management Ltd | Glasgow | 2025 |
| Caledonian Alloys Limited | Livingston | 1996 |
| Caledonian Environmental Levenmouth Treatment Services Limited | Durham | 2000 |
| Caledonian Environmental Services PLC | Methil, Leven | 1995 |
| Caledonian Knotweed Specialists Ltd | Kilmacolm | 2020 |
| Caledonian Site Services Limited | Glasgow | 2020 |
| Caledonian Tyres Limited | Wilmslow | 2006 |
| Caledonian Waste Solutions Ltd | Glasgow | 2016 |
| Caledonian Water Services Limited | Edinburgh | 2025 |
| Calibre Property Services Group Ltd | Cambridge | 2025 |
| Call 4 Clearance Limited | Fawkham | 2026 |
| Call Danny Ltd | London | 2014 |
| Call FIX Ltd | London | 2025 |
| Callow Secure Destruction Limited | Shrewsbury | 2021 |
| Callthor Plumbers Limited | London | 2008 |
| Caltec Hire Ltd | Telford | 2018 |
| Calverley's Timber Products Limited | Burnley | 1977 |
| Calverton Clearance Services Ltd | Nottingham | 2021 |
| CAM Valley Grab Hire Limited | Radstock | 2023 |
| CAM01 (Waste) Limited | London | 2005 |
| Cambrane Limited | Cambridge | 2025 |
| Cambria Waste Solutions Ltd | Pontypridd | 2023 |
| Cambrian Utilities Limited | Cardiff | 2016 |
| Cambrian Waste 2 Energy Ltd | Orsett | 2012 |
| Cambridge House Clearance Partner Solutions Ltd | London | 2026 |
| Cambridge House Clearance Solutions Ltd | Cambridge | 2025 |
| Cambridge Service Group Limited | Cambridge | 2024 |
| Cambridge Skip Hire Limited | Cambridge | 2022 |
| Cambridge Van MAN Removals and Clearance Limited | Cambridge | 2016 |
| Cambridge Virucells Limited | | 1986 |
| Cambridgeshire Aggregates & Recycling Limited | Little Thetford | 2021 |
| Cambridgeshire Clearance and Recycling Ltd | Ely | 2018 |
| Cambridgeshire Waste Collectors Ltd | Cambridge | 2025 |
| Cambs Recycle Ltd | Wisbech | 2024 |
| Cambs Recycling Limited | Cambridgeshire | 2008 |
| Camden Plant Limited | London | 1990 |
| Camden Wells Advisers Ltd | Winchester | 2021 |
| Cameo Waste Solutions Limited | Chatteris | 2020 |
| Cameron Contracts Ireland Limited | Portadown | 2014 |
| Cameron Dalziel Skip Hire Ltd | Motherwell | 2020 |
| Camiers Group Limited | Uxbridge | 2017 |
| Camion UK Ltd | Birmingham | 2018 |
| Camline Services (East Midlands) Limited | Northampton | 2014 |
| Camoys Mead Management Limited | Alton | 2003 |
| Campbell & Armstrong PLC | Manchester | 1963 |
| Campbell Grab Services Ltd | Hemel Hempstead | 2012 |
| Campbell Reclaims Ltd | Croydon | 2025 |