| THE Bybrook Trust | Clifton | 1999 |
| THE C. Alma Baker Trust | Huntingdon | 2006 |
| THE Cabbage Company Limited | Spalding | 2012 |
| THE Cabbage Patchers | Newry | 2012 |
| THE Cala Falco Group Ltd | London | 2025 |
| THE Caledonian Oyster Company Limited | Albany Street,Oban | 1996 |
| THE Calf Company (Europe) Limited | Winsford | 2008 |
| THE Callaly Estates Company Limited | Alnwick | 1940 |
| THE Canine Consultant NW Limited | Manchester | 2025 |
| THE Canine Parlour UK Limited | Brentford | 2023 |
| THE Capybara Cafe (Norfolk) Limited | Dereham | 2025 |
| THE Carbon Community | Windsor | 2019 |
| THE Carbon Farm Ltd | York | 2019 |
| THE Carbon Neutral Cattle Company Limited | Ballymena | 2020 |
| THE Cardiff Honey Company Ltd | Cardiff | 2011 |
| THE Carmarthenshire Rivers Trust | Ammanford | 2007 |
| THE Carp Syndicate Limited | Tunbridge Wells | 2011 |
| THE Cat Butler Ltd | London | 2016 |
| THE Cat NAP Company Ltd | Bury St. Edmunds | 2021 |
| THE Cats Other Mother Limited | Manchester | 2020 |
| THE Cattle Information Service Limited | Aberdeen | 1993 |
| THE Cattle Yard Ltd | Birchington | 2017 |
| THE Cat’S Dinner Table Ltd | London | 2025 |
| THE Cauldshiel Cattle Company Ltd | Haddington | 2012 |
| THE Cawdale Group Ltd | Penrith | 2024 |
| THE Centennial Asil Arabian Stud Limited | Sheffield | 1996 |
| THE Central Dartmoor Farm Cluster CIC | Yelverton | 2023 |
| THE Centre for Biodiverse Carbon Farming Ltd | London | 2022 |
| THE Centre for Dairy Information Limited | Telford | 2005 |
| THE Centre for Occupational Health and Wellbeing Limited | Carnforth | 2011 |
| THE CFL Project Ltd | Huddersfield | 2021 |
| THE Chedington Estate Limited | Beaminster | 2017 |
| THE Chedley Fold Limited | Halesworth | 2013 |
| THE Cheshire Mushroom Co. Ltd | Manley, Frodsham | 2023 |
| THE Chestnuts Butterwick Ltd | Butterwick | 2024 |
| THE Chilli Groves Company Ltd | Cheadle | 2023 |
| THE Chilli Trading Company Ltd | Weston-Super-Mare | 2013 |
| THE Chirpy EGG Company Limited | Lincoln | 2017 |
| THE Classical Riding Academy Ltd | Waterlooville | 2019 |
| THE Cleaner Fish Company Limited | Dorchester | 2015 |
| THE Clun LOG Company Ltd | Knighton | 2024 |
| THE Cockerdale Estate Ltd | York | 2022 |
| THE Code of Good Shooting Practice Limited | Wrexham | 2005 |
| THE Cold Water Salmon Corporation Ltd | London | 2020 |
| THE Collycroft Herd Limited | Burton Upon Trent | 2014 |
| THE Comber Potato Company Ltd | Belfast | 2026 |
| THE Community Growers CIC | Boston | 2023 |
| THE Community Patch CIC | Wigan | 2025 |
| THE Community Woodlands Association | Lochgilphead | 2004 |
| THE Conant Farming Company (Lyndon) Limited | Rutland | 2024 |
| THE Conifer Breeding Co-Operative Ltd | Roslin | 2014 |
| THE Coppice Woodsmen Ltd | Newmarket | 2026 |
| THE Coral Centre Ltd | Fareham | 2020 |
| THE Coral Exchange Limited | Bedford | 2026 |
| THE Coral Farm Ltd | Ferndown | 2024 |
| THE Corinium Rifle Range Ltd | Cheltenham | 2009 |
| THE Corn Exchange Company Limited | Hitchin | 1987 |
| THE Cornish Black BEE Company Ltd. | Penzance | 2019 |
| THE Cornish Buffalo Ltd | Truro | 2022 |
| THE Cornish KOI Company Ltd | Bodmin | 2023 |
| THE Cornish Seaweed Company Limited | Helston | 2015 |
| THE Cornish Vineyard Ltd | Truro | 2020 |
| THE Cornwall COW Company Limited | Truro | 2004 |
| THE COT Collection Ltd | Pontyclun | 2022 |
| THE Cotswold Fruit Company Ltd. | Cheltenham | 2014 |
| THE Cotswold Group Limited | Reading | 2017 |
| THE Cotswold Honey Company Ltd | Broadway | 2016 |
| THE Cotswold Mobile Dairy Ltd | Burford | 2021 |
| THE Cotswold Way Farm Limited | Dursley | 2014 |
| THE Cottage Farm Grimethorpe Limited | Barnsley | 2017 |
| THE Countess Sondes Foundation Limited | Badlesmere Faversham | 2003 |
| THE Country Way (Kent) Limited | Ashford | 2023 |
| THE Countryside Regeneration Trust Ltd | Cambridge | 2010 |
| THE Cowsmith Ltd | Stoke-On-Trent | 2023 |
| THE Crawley & Horsham Hunt Limited | Horsham | 2004 |
| THE Creelman Ltd | Tighnabruaich | 2022 |
| THE Croome and West Warwickshire Foxhounds Limited | Worcester | 2002 |
| THE Crop Smith Ltd | Peterborough | 2020 |
| THE Cross Partnership Limited | Milton Keynes | 2010 |
| THE Crossing Community Supported Agriculture C.I.C. | Forest Row | 2017 |
| THE Crown and Lead Dog Walk Limited | London | 2026 |
| THE Cuddly Cat Company Ltd | London | 2024 |
| THE Cutty Bark Limited | Penryn | 2026 |
| THE Cyprinids Angling Club Limited | Louth | 1988 |
| THE Daffodil Project CIC | Rainham | 2025 |
| THE Daily Wags Limited | Northampton | 2026 |
| THE Dancing Masters Holding Company Ltd | Wolverhampton | 2023 |
| THE Darach MOR Woodland Company Limited | Glasgow | 2016 |
| THE Dark Place Limited | Whitby | 2010 |
| THE Darlington Farmers Auction Mart Company Limited | Darlington | 1926 |
| THE Dartmoor Hill Pony Display Team C.I.C. | Newton Abbot | 2024 |
| THE Dartmoor Shepherd Ltd | Wellington | 2016 |
| THE Deep Ocean Water Research and Development Initiative (Sea-Based CO2 and Thermal Offsetting) Ltd. | Hailsham | 2020 |
| THE Deer Wood Trust C.I.C. | Kingsbridge | 2023 |
| THE Dell Vineyard Ltd | Usk | 2021 |
| THE Delph Hill Preservation Limited | Sheffield | 1989 |
| THE Derwent Hunt Limited | Pickering | 2006 |
| THE Dickinson Group Limited | Morpeth | 2024 |
| THE Diveworks Limited | Brighton | 2013 |
| THE Dog Bark Ltd | Craigavon | 2022 |