| Cloud Farming Limited | North Berwick | 2017 |
| Cloudenj Services Limited | Belvedere | 2025 |
| Clough Head Barn Limited | Bacup | 2025 |
| Clough House Liveries Ltd | Halifax | 2026 |
| Cloughfields Equestrian Centre Limited | Sheffield | 2017 |
| Cloughfields Riding School Limited | Sheffield | 2019 |
| Cloughmills Community Action Team | Ballymena | 2011 |
| Cloughmore Shellfish Ltd | Newry | 2005 |
| Clouston Landbased Contracting Ltd | Newcastle Upon Tyne | 2025 |
| Clova Estate Limited | Edinburgh | 1995 |
| Clova Farms Limited | Forfar | 1941 |
| Cloveneden Farm Ltd | Loughgall | 2024 |
| Clover Leaf Farm Ltd | Derby | 2020 |
| Clover Meadow Farm Limited | Chesterfield | 2025 |
| Clover Polo Ltd | Bracknell | 2017 |
| Clovercrest Ltd | London | 2026 |
| Cloverfield on the Quarry Ltd | Peterhead | 2018 |
| Cloverhill Hatcheries Limited | Maghera | 2014 |
| Cloverlait Limited | Marlborough | 2005 |
| Cloverpark Trading Limited | Magherafelt | 2010 |
| Cloverstand Limited | | 1976 |
| Clovis Supplies Limited | Swindon | 2025 |
| Clowance Farm Limited | London | 2020 |
| Cloy Hall Dairy Services Limited | Malpas | 2016 |
| CLP Desford Limited | Leicester | 2020 |
| CLS Farming Limited | Dumfries | 2023 |
| CLS Marine Ltd | Peterhead | 2012 |
| Cluan Forestry Limited | Bellshill | 2025 |
| Cluanie Limited | Perth | 2015 |
| Clumber Agriculture Ltd | Worksop | 2023 |
| Clumber Farm Limited | Nr Worksop | 1961 |
| Clumber Livery Limited | Worksop | 2012 |
| Clumber Pigs Ltd | Worksop | 2014 |
| Clun Forest Sheep Breeders Society Limited(The) | Shrewsbury | 1947 |
| Clun Valley Nursery Limited | Telford | 2025 |
| Clun Woodlands Limited | Tunbridge Wells | 1998 |
| Clune Lodge Ltd | Inverness | 2018 |
| Clungonnas Estates (01) Limited | Craven Arms | 2002 |
| Cluny Activities Ltd | Kirkcaldy | 2000 |
| Cluny Home Farms Limited | Inverurie | 1972 |
| Cluny Limited | Aberfeldy | 2005 |
| Clutton Vale Farm Ltd | Bristol | 2024 |
| Clwydian Cartography Limited | St. Asaph | 2019 |
| Clyde Agri Contracts Limited | Ballyclare | 2015 |
| Clyde Agriculture (Seeds) Ltd. | Carluke | 2002 |
| Clyde Pawpawrk Limited | Larkhall | 2025 |
| Clyde Shellfish Ltd | Gourock | 2010 |
| Clyde Valley Woodland Pigs Limited | Glasgow | 2024 |
| Clydegrow Farm Limited | Glasgow | 2025 |
| Clyffe Farms(Tincleton)Limited | Wellington | 1972 |
| Clyn-Du International Contracts Limited | London | 2017 |
| Clynderwen Farm Dairy Limited | Cwmbran | 2022 |
| Clytha Farms Limited | Newport | 1996 |
| CM Agricultural Services Ltd | Devizes | 2024 |
| CM Agriculture (Lincolnshire) Limited | Sleaford | 2019 |
| CM Agriculture Limited | Norwich | 2011 |
| CM Dressage Ltd | Halstead | 2021 |
| CM Farriery Ltd | Middlewich | 2023 |
| CM Forage Ltd | Kings Lynn | 2025 |
| CM Growfresh Limited | Northampton | 2011 |
| CM Services Agricultural and Groundwork Ltd | Wellingborough | 2019 |
| CM Tree Care South Ltd | Bognor Regis | 2026 |
| CM Tree Services Limited | Alford | 2022 |
| CMA Sports Horses Ltd | Northampton | 2025 |
| Cmac Groundworks Ltd | Omagh | 2022 |
| CMC Production Ltd | Keady | 2017 |
| Cmck Limited | Cecil Street | 2005 |
| CMF Compacts Ltd | Lincoln | 2026 |
| CMG Agronomy Limited | Dereham | 2018 |
| CMG Contracting Ltd | Scarning, Dereham | 2018 |
| CMG Contractors Ltd | Norwich | 2021 |
| CMM Maintenance Ltd | Stockton On Tees | 2021 |
| CMS Livestock Limited | Whittington | 2015 |
| CMT Solutions Limited | Kidwelly | 2003 |
| CN & IR Atkin Ltd | Tarporley | 2010 |
| CN Forestry & ARB Ltd | Hebden Bridge | 2020 |
| Cnewr Estate Limited(The) | Brecon | 1955 |
| CNJ Services Ltd | Glasgow | 2016 |
| CNJ Solutions Ltd | Berkshire | 2005 |
| CNM Marine Ltd | Helensburgh | 2011 |
| CNM Property Services Ltd | Harrow | 1996 |
| Co-Operative of Leicestershire Organic Growers Ltd | Leicester | 2006 |
| Co-Treetment Ltd | Derby | 2019 |
| Coach House Farm Limited | Cardiff | 2012 |
| Coachouse CIC | London | 2022 |
| Coachtree Ltd | Chepstow | 2022 |
| Coalpark Farm Ltd | Witton Gilbert | 2024 |
| Coarse Fish UK Limited | Littlehampton | 2011 |
| Coast Marine Services Limited | Galmpton | 2024 |
| Coastal BOY Ltd. | Buckie | 2018 |
| Coastal Forge Farriery Ltd | Waterlooville | 2026 |
| Coastal Nets Limited | Bridport | 2007 |
| Coastal Pigs Limited | Suffolk | 2002 |
| Coastal Spaces Design Ltd | Colchester | 2018 |
| Coastal Tree & Access Ltd | Blandford Forum | 2021 |
| Coastal Tree Care Limited | Weymouth | 2015 |
| Coastal Tree Services Ltd | St. Asaph | 2022 |
| Coastline Shellfish Limited | Driffield | 2013 |
| Coatfern Limited | Norfolk | 1997 |
| Coba Produce International Limited | Sedbergh | 2004 |