| Claret (Eco) Ltd | Derby | 2021 |
| Clarevara Ltd | Dumfries | 2025 |
| Claridge & Partridges Limited | London | 2025 |
| Clarity First Solutions Limited | Wadhurst | 2020 |
| Clark & Weir Limited | Jedburgh | 2003 |
| Clark Contracting (Haworth) Limited | Keighley | 2023 |
| Clark Farming (Berden) Ltd | Great Hallingbury | 2026 |
| Clark Farms Limited | Chippenham | 2012 |
| Clark Mactavish Limited | Carlisle | 1999 |
| Clarkco Limited | Warwick | 1980 |
| Clarke Agri Services Limited | Nottingham | 2015 |
| Clarke Aquatics Ltd | Evesham | 2025 |
| Clarke Dairies Ltd | Castlederg | 2011 |
| Clarke Farm Services Limited | Cullompton | 2018 |
| Clarke Farming Ltd | Woodstock | 2022 |
| Clarke Farms (Isleham) Limited | Norwich | 2007 |
| Clarke Farms Limited | Nottingham | 2007 |
| Clarke Ground Maintenance Ltd | Abergavenny | 2025 |
| Clarke's Agricultural Services Ltd | Knutsford | 2024 |
| Clarke's Livestock and Agricultural Services Ltd | Reading | 2020 |
| Clarke's Tree Care Limited | Bournemouth | 2007 |
| Clarkes of Bowley Limited | Winchester | 2016 |
| Clarkham Cross Ltd | Beaminster | 2023 |
| Clarkhill Limited | Tonbridge | 2010 |
| Clarkhill Trading Ltd | Newry | 2017 |
| Clarkson Produce Ltd | Spalding | 2025 |
| Clarkwood Nurseries Ltd | Trowbridge Wiltshire | 2017 |
| Classic Agro Group Ltd | Cardiff | 2025 |
| Classic Constractions Limited | London | 2025 |
| Classic Engineering IW Limited | Isle Of Wight | 2008 |
| Classic Tractor Services Ltd | Keith | 2015 |
| Claston Orchards Limited | Doncaster | 2016 |
| Clat Agri Ltd | Newport | 2019 |
| Clate Engineering Ltd | Whalsay | 2011 |
| Clathic Estate Limited | Crieff | 2025 |
| Claudia Farming Holdings Limited | Alton | 2005 |
| Claudia Langmead Farming Limited | Alton | 2005 |
| Claughton Calf Company Limited | Preston | 2011 |
| Claughton Hall (Bisons) Limited | Lancaster | 1987 |
| Claughton Hall Estate Limited | Lancaster | 2020 |
| Claverdon Cartridges Limited | Claverdon | 1996 |
| Clavering Investments Ltd | Chelmsford | 2025 |
| Claw and Order Ltd | Exmouth | 2026 |
| Clawdd Llwyd Ltd | Blaenau Ffestiniog | 2009 |
| Claxby Wood Ltd | Market Rasen | 2025 |
| Clay Hall Kennels Limited | Downham Market | 2020 |
| Clay Lake Farm Limited | Spalding | 1944 |
| Clay View Canines Ltd | Armagh | 2019 |
| Clay's Orchard Ltd | Frome | 2025 |
| Claycrop Farms Ltd | Newton Stewart | 2016 |
| Claydon Equestrian Limited | Milton Keynes | 2026 |
| Claydon Horse Exercisers Limited | Warwickshire | 1999 |
| Claydon Limited | Warwickshire | 2005 |
| Claydons Farm Limited | Purleigh | 2020 |
| Claydons Stud Farm Ltd | Stratford-Upon-Avon | 2024 |
| Clayewater Farms Limited | Barnstaple | 2017 |
| Claygate Farms (Spratsbourne) Limited | Cranbrook | 2021 |
| Claygate Lake Ltd | Wallington | 2019 |
| Clayhill Farming Limited | Bedford | 2020 |
| Claylands Holdings Limited | St. Neots | 1995 |
| Claylands Wines Limited | Worksop | 2015 |
| Claymore Racing Ltd | Edinburgh | 2023 |
| Claythorne Farm Ltd | Barnetby | 2024 |
| Clayton Farming Limited | Bradford | 2020 |
| Clayton Lane Boarding Kennels Ltd | Pontefract | 2022 |
| Clayton Wickham Farm Limited | Hurstpierpoint | 2014 |
| Clea Contracts Limited | Armagh | 2024 |
| Cleaboy Farms Company | Thirsk | 1962 |
| Clean Beet Ltd | Rotherham | 2023 |
| Clean CUT Trees Ltd | Milford Haven | 2020 |
| Cleanerfish Scotland Limited | Edinburgh | 2011 |
| Clear Consulting International Limited | London | 2018 |
| Clear CUT Trees Ltd | Stanmore | 2012 |
| Clear Pest Solutions Limited | Wolverhampton | 2019 |
| Clear Sky Services Limited | Glasgow | 2015 |
| Clear Source Ltd | Llandovery | 2010 |
| Clear View Farm Limited | Weymouth | 2019 |
| Clear View Stud Limited | London | 2018 |
| Clear View Tree & Hedge Services Limited | Brixham | 2014 |
| Clear Water Fisheries Limited | Chorley | 2015 |
| Clearacre Farming Limited | Dereham | 1997 |
| Clearbrook Farm Limited | Carmarthen | 2023 |
| Clearbrook Tree Services Ltd. | Princetown | 2023 |
| Clearcut Tree Surgery Ltd | Bournemouth | 2023 |
| Clearfield Poultry Ltd | Ayr | 2023 |
| Clearfields Farm Limited | Aylesbury | 1982 |
| Clearline(Uk) Ltd | Mountain Ash | 2014 |
| Clearly Aquatics Ltd | Bangor | 2011 |
| Clearspan Tree Management Ltd | Wimborne | 2026 |
| Cleartrack (EVL) Ltd | London | 1999 |
| Clearviews Contractors Ltd | Caterham | 2018 |
| Clearwater Diving Ltd | Exmouth | 2019 |
| Clearwater Farm Group Limited | Bampton | 2021 |
| Clearwater Lakes Fishery Limited | Retford | 2004 |
| Clearwater Stud Limited | Milton Keynes | 2018 |
| Clearwest Limited | Brighton | 1979 |
| Cleascro NO.1 Ltd | Linwood | 2024 |
| Cleat Hill Feedstock Limited | Swadlincote | 2015 |
| Cleaton Services Ltd | Peterhead | 2017 |
| Cleave Farm Limited | Tiverton | 2018 |