| Churnet Valley Farmers CIC | Stoke-On-Trent | 2024 |
| Chute Farms Limited | Winchester | 1939 |
| Chute Forest Limited | Andover | 1996 |
| CHX Bloodstock Limited | Northampton | 2022 |
| CHY Holdings Limited | Redruth | 2021 |
| Chyan Pure Foods CIC | Penryn | 2022 |
| Chyknell Hall Farms Limited | Bridgnorth | 2015 |
| Chyreen Fruit Farm Limited | Truro | 2002 |
| Chyverton Estate Company Limited | Truro | 1946 |
| Cielivestock Limited | York | 2015 |
| Cigar and Cork Collective Ltd | Ilford | 2025 |
| Cilast Limited | Pembrokeshire | 2005 |
| Cilau Fawr Limited | Pembrokeshire | 2010 |
| Cilevan Farm Limited | Carmarthen | 2002 |
| Cilfeithy Farm Services Limited | | 2007 |
| Cilgwenyn BEE Farm CYF | Llanelli | 2019 |
| Cilgwyn Farm Limited | Brecon | 2008 |
| Cilvatica Ltd | Thetford | 2024 |
| Cinder Hill Vineyard Limited | Haywards Heath | 2021 |
| Cinecarp TV Ltd | Basildon | 2023 |
| Cinn Mhara Ltd. | Fraserburgh | 2003 |
| Cinque Ports Pest Control Ltd | Romney Marsh | 2020 |
| Circle H Polo Limited | Maidenhead | 1997 |
| Circusstar Limited | Whitefield | 1997 |
| Cirel Ltd | Wimborne | 2017 |
| Cirencester Park Farms Limited | Cirencester | 1962 |
| CIS Equestrian Livery Limited | Stockport | 2020 |
| CIS Equestrian Sales Limited | Stockport | 2020 |
| Citadel Farms Limited | Shrewsbury | 1964 |
| Citiedge Holdings Limited | London | 2024 |
| Citrine (Eco) Ltd | Derby | 2021 |
| Citron (Eco) Ltd | Derby | 2021 |
| City & Country Wellwick Ltd | Stansted | 2020 |
| City Carriages (London) Limited | Enfield | 2006 |
| City Greens Foodtech Ltd | Telford | 2024 |
| City Plants CIC | Glasgow | 2026 |
| City Seeds CIC | Gateshead | 2021 |
| City Suburban Tree Surgeons (Recycling) Limited | Beckenham | 2022 |
| Citycaninewalkers Ltd | Cardiff | 2026 |
| Cityregen NET Zero Ltd | Pulborough | 2020 |
| CJ & AJ Butler Limited | Swansea | 2016 |
| CJ & B Parr & Sons Limited | Gainsborough | 2011 |
| CJ & JM Stackhouse Ltd | Preston | 2014 |
| CJ and CM Limited | Dumfries | 2022 |
| CJ Environmental Ltd | Droitwich | 2026 |
| CJ Jerman Limited | Montgomery | 2015 |
| CJ Prawnstar Ltd | Ellon | 2022 |
| CJ Prop Ltd | Ely | 2016 |
| CJB Land Management Ltd | Bognor Regis | 2023 |
| CJD Farm Management Limited | Scunthorpe | 2012 |
| CJD Farms Limited | Moira | 1995 |
| Cjep Limited | Omagh | 2018 |
| CJG Silviculture Ltd | Ulverston | 2013 |
| CJJ ARB Associates Ltd | Norwich | 2022 |
| CJK Equine Ltd | Middletown | 2018 |
| CJK Marine Ltd | Lerwick | 2024 |
| CJL Services Ltd | Midhurst | 2026 |
| Cjld Limited | Stone | 2022 |
| CJM Tree Care Limited | Chorley | 2022 |
| CJM Tree Specialists Ltd | St. Helens | 2023 |
| CJP Farms Ltd | Hull | 2023 |
| CJR Fishing Ltd | Peterhead | 2025 |
| CJS Land (2014) Limited | Ely | 2014 |
| CJS Motors Ltd | York | 2011 |
| CJS Tree & Garden Services Limited | Nottingham | 2025 |
| CJUK2019 Ltd | Stratford-Upon-Avon | 2019 |
| CK Agriculture Ltd | Warrington | 2022 |
| CK Forestry Contractors Ltd | Largs | 2024 |
| CKF Farms Limited | Armagh | 2023 |
| CKH Dogs Limited | Westerham | 2017 |
| CKM Fishing Limited | Cromarty | 2024 |
| CKS Commercial Fishing Ltd | Amlwch | 2013 |
| CL Equestrian Centre Ltd | Chester | 2025 |
| CL Farriery Limited | Henfield | 2018 |
| CL Fisheries Ltd | Lymington | 2025 |
| CL6TG Farming Limited | Northampton | 2021 |
| Clach Mhor Holdings Ltd | Lochearnhead | 2022 |
| Clacton Fisheries Ltd | Clacton On Sea | 2010 |
| Cladybeg Farms Ltd | Newry | 2011 |
| Clairdonhill Fishing Ltd | Thurso | 2025 |
| Claire Austin Hardy Plants Limited | Newtown | 1999 |
| Claire Cleaners Holdings Limited | Chatham Maritime | 1969 |
| Claire Louise Fishing Ltd | Alness | 2017 |
| Clam B Ltd | Fareham | 2020 |
| Clan Farms Limited | Norwich | 1954 |
| Clandeboye Estate Company Limited-The | Bangor | 1950 |
| Claonaig Estate Limited | Tarbert | 2007 |
| Claramor Ltd. | Eype | 2012 |
| Clarbeston Grange Limited | Haverfordwest | 2019 |
| Clare Park Farming Limited | Farnham | 2026 |
| Claremont Farm Limited | Wirral | 2010 |
| Claremont Farm Produce Ltd | Stalbridge | 2023 |
| Claremont Properties (Newcastle) Limited | Carlisle | 1945 |
| Claremore Poultry Ltd | Augher | 2022 |
| Claremullan Farms Ltd | Craigavon | 2019 |
| Clarence Murray (Potato Growers and Farmers) Limited | Edinburgh | 1973 |
| Clarendon Farm Limited | Bournemouth | 2016 |
| Clarendon Park Farms Limited | Salisbury | 2006 |
| Clares Barn Limited | Atherstone | 2008 |
| Clares Horses Central Bedfordshire Limited | Milton Keynes | 2009 |