| County Waste Limited | Birmingham | 2001 |
| County Water Limited | Bicester | 2015 |
| Countyclean Waste Recycling Limited | Chorley | 2016 |
| Countyloos Ltd. | Whitchurch | 1987 |
| Court Auto Dismantlers Limited | Birmingham | 2008 |
| Court Meadow Ltd | Hereford | 2019 |
| Courtfold Limited | East Sussex | 1981 |
| Courtlands of Harlow Ltd | Dartford | 2015 |
| Courtlands Waste Management (UK) Limited | Harlow | 2009 |
| Courtney Trading International Metals Ltd | Brentwood | 2025 |
| Cousin's Waste OIL Limited | Waltham Abbey | 2025 |
| Coventry Drain Unblocking Ltd | Dungannon | 2021 |
| Covill Skip Hire Limited | Cambridge | 2025 |
| Cowal Home & Hygiene Services Limited | Dunoon | 2024 |
| Cowick Industrials Ltd | London | 2024 |
| COX Plant Water Borehole Drilling Limited | Barnstaple | 2021 |
| COX Skip & Waste Management Ltd | Bridgend | 2017 |
| COX Skips Limited | Turners Hill | 2000 |
| CP Environmental Ltd | Chesterfield | 2013 |
| CP Services (Borders) Limited | Carlisle | 2021 |
| CPD Skip Hire Ltd | Birmingham | 2020 |
| CPD Waste Removal Ltd | London | 2024 |
| CPL France Limited | Sheffield | 2007 |
| CPP Waste & Recycling Limited | Matlock | 2009 |
| CPR Components (Hull) Ltd | Hull | 2017 |
| CPS Management Pentney 2004 Limited | Thetford | 2004 |
| CR Solution Services Ltd | Newport | 2025 |
| CR Waste Removals Ltd | Bolton | 2025 |
| CRA Pipefitting Ltd | Glasgow | 2019 |
| Craddock Metal Recycling Limited | Solihull | 2006 |
| Craft Waste Ltd | London | 2020 |
| Craig Enterprises Limited | Cramlington | 2001 |
| Craig Humpage Tipper Hire Limited | Burntwood | 2021 |
| Craigmyle Residents' Peel Treatment Plant Service Company Limited | Galashiels | 2005 |
| Craigneuk Developments Limited | Glasgow | 2019 |
| Craigy's Skip Hire Limited | Galashiels | 2020 |
| Craig’S Efficient Waste Solutions Ltd | Wishaw | 2025 |
| Craima Cable Recycling Ltd | Swindon | 2015 |
| Cranfield Paper Recycling Ltd | Romford | 2013 |
| Cranford Environmental Advisors Limited | Cardiff | 2001 |
| Cranford Tyre Recovery Limited | Kettering | 2021 |
| Cranleigh Environmental Limited | Erith | 2008 |
| Crapper & Sons Landfill Limited | Swindon | 1999 |
| Crawley Van MAN Ltd | Crawley | 2024 |
| CRB Skips & Waste Ltd | Plymouth | 2024 |
| CRB Waste Clearance Ltd | Barking | 2021 |
| Creation Recycling Limited | Rotherham | 2003 |
| Creative Waste Solutions Ltd | Towcester | 2016 |
| Credential Environmental Limited | Bellshill | 2001 |
| Credential PTL Limited | Worthing | 2008 |
| Creed Scaffolding Limited | Nottingham | 2014 |
| Creeve Holdings Limited | Randalstown | 2020 |
| Creigiau Tyres Limited | Bridgend | 2004 |
| Cremate-A-Pet Limited | Hampshire | 2002 |
| Cremation Reclaim Limited | Witham | 2021 |
| Cres Energy Limited | Carmarthen | 2015 |
| Crescent Operations Ltd | Bristol | 2024 |
| Crescent Waste & Recycling Industries Limited | London | 2026 |
| Cress Water Ltd. | Devon | 1999 |
| Crest Co-Operative Ltd. | Llandudno Junction | 1998 |
| Crest Environmental Services Limited | Ellesmere Port | 2000 |
| Crest Industrial Services (UK) Limited | Ellesmere Port | 2015 |
| Crews Hill Metal Recycling Ltd | Crews Hill, Enfield | 2023 |
| Crichton Drainage Limited | Whitehaven | 2004 |
| Crimson Grey Associates Limited | Ilford | 2020 |
| Crisis Cleanup Ltd | Folkestone | 2024 |
| Crispcycle Ltd | Greenford | 2025 |
| Cristal Services Ltd | Enfield | 2024 |
| Cristal Washroom Services Ltd | Llantrisant | 2010 |
| Critical Waste Ltd | Bude | 2008 |
| Criw Compostio Ltd | Machynlleth | 2024 |
| CRJ Services Holdings Ltd | Knutsford, Cheshire | 2015 |
| CRJ Services Limited | Cheshire | 1999 |
| CRL Recovery Ltd | Tunbridge Wells | 2024 |
| Croaghaun Holdings Ltd | Belfast | 2021 |
| Croaghaun Ltd | Belfast | 2018 |
| Croc Waste Ltd | Tunbridge Wells | 2014 |
| Crockett Lowe Limited | Birmingham | 1946 |
| Croft Consult Ltd | Hove | 2021 |
| Cromhall Recycling Ltd | Bristol | 2020 |
| Crompton Waste Removals Ltd | Bolton | 2025 |
| Cromwell Close Management Limited | Morpeth | 1995 |
| Crosland VK Limited | Manchester | 1990 |
| Crosmill Holdings Ltd | Ross-On-Wye | 1999 |
| Cross CUT Shredding Ltd | Yeovil | 2015 |
| Cross Environmental Services Limited | London | 1991 |
| Cross Road Transport Ltd | Aberdeen | 2026 |
| Cross Waste Recycling Limited | Bingham | 2010 |
| Crossco (1370) Limited | Doncaster | 2014 |
| Crossco (1371) Limited | Doncaster | 2014 |
| Crossgreen Investments Limited | Leeds | 2014 |
| Crosshill Enviro Limited | Belfast | 2015 |
| Crossley Tyres Limited | York | 2009 |
| Crossmaglen Dismantlers Ltd | Armagh | 2026 |
| Crossways Recycling Limited | Swanscombe | 2006 |
| Croughton Renewable Resources Centre Limited | Towcester | 2007 |
| Crow - Coventry Recycling of Waste | Coventry | 1990 |
| Crow Cable Processing Limited | London | 2018 |
| Crow Metals Limited | Loughton | 2004 |
| Crowley Environmental Services (UK) Limited | Langley | 2024 |