| Cutting the UK Ltd | Bexhill-On-Sea | 2018 |
| Cuttingsandclones Ltd | London | 2019 |
| Cuttle Mill Fishery Limited | Shifnal | 2015 |
| Cuttlebrook KOI Farm Limited | Milton Keynes | 2000 |
| Cutts Lane Nurseries Limited | Preston, | 2003 |
| CVI U.K. Ltd | London | 2023 |
| CVL Farms Limited | Stonehaven | 2023 |
| CVR Equestrian Limited | Horsham | 2020 |
| CW Chapman & SON Ltd | Bridlington | 2011 |
| CW Engineering (Devon) Limited | Tiverton | 2014 |
| CW Engineering and Fishing Ltd | Fraserburgh | 2019 |
| CW Estates (Cumbria) Ltd | Penrith | 2026 |
| CW Farms (Sussex) Limited | East Grinstead | 2022 |
| CW Kent Construction Ltd | New Romney | 2020 |
| CW Showjumping Limited | Gislingham | 2025 |
| CW4 Group Ltd | Nottingham | 2025 |
| CWD Plant & Haulage Limited | Halstead | 2004 |
| CWM Clydach Estates Limited | Godstone | 2003 |
| CWM Colebatch Farm Limited | Shrops | 1950 |
| CWM Cudd Ltd | Pontypridd | 2025 |
| CWM Faelog Limited | Southam | 2016 |
| CWM TY Coed Ltd | Carmarthen | 2023 |
| Cwmbetws Limited | Dyfed | 2003 |
| Cwmdarhian Small Holdings Limited | Bargoed | 2016 |
| Cwmfelin Developments Limited | Llandovery | 2003 |
| Cwmheulog Limited | Abergavenny | 2015 |
| Cwmni G R CYF | Carmarthen | 2026 |
| Cwmni-Gro-A-Tywod CYF | Gwynedd Wales | 2004 |
| CWO (Peterhead) Ltd | Peterhead | 2019 |
| CWR Holdings Limited | Leicester | 2008 |
| Cwrt Henri Farms Ltd | Llandeilo | 2009 |
| Cwrt Malle Limited | Carmarthen | 2004 |
| Cwrt Perrott Farm Limited | Newport | 2014 |
| CWT Sporting Ltd | Earlston | 2026 |
| Cwtch Alpacas Ltd | Abergavenny | 2022 |
| CWW Farming Ltd | Hereford | 1988 |
| CX Stables Limited | Watford | 2024 |
| CY1 Ltd | Isle Of Barra | 2023 |
| Cyan (Eco) Ltd | Derby | 2021 |
| Cybercode Solutions Limited | Milnthorpe | 1997 |
| CYC Pet Services Ltd | Newport | 2024 |
| Cycleme Limited | London | 2022 |
| Cyfoeth Y Coed C.I.C. | Swansea | 2024 |
| Cygnet PEP Limited | Kinross | 1977 |
| Cygnet Potato Breeders Ltd. | Kinross | 1997 |
| Cygnus Agri Ltd | Stonehouse | 2025 |
| Cymbrogi CIC | Port Talbot | 2023 |
| Cymdeithas Amaethyddol Meirion CYF | Criccieth | 2019 |
| Cymdeithas CWN Defaid Cymreig | Aberystwyth | 1998 |
| Cymdeithas Defaid Iseldir Lliw - Coloured Down Sheep Association Limited | Carmathenshire | 2021 |
| Cymdeithas Enweiriol Afon Dwyfor Angling Association Limited | Criccieth | 2010 |
| Cymdeithas Genweirwyr Gwalia CYF | Bridgend | 2000 |
| Cynefin Place Limited | Cardiff | 2025 |
| Cynnen Limited | Carmarthen | 2019 |
| Cyno Dogs Ltd | Harrow | 2021 |
| Cynon Valley Organic Adventures Ltd | Aberdare | 2018 |
| CYO Seeds (Midlands) Limited | Lutterworth | 2005 |
| CYO Seeds Limited | Near Didcot | 1978 |
| CYO Seeds West Ltd | Swindon | 2020 |
| Cyproguard Ltd | Gillingham | 2022 |
| Cyril Cooper & Sons Limited | Rotherham | 1964 |
| Cyril Dyson Sporting Services Ltd | Blairgowrie | 2024 |
| Cysgod Y Gwynt CYF | Amlwch | 2020 |
| Czernin-Kinsky Scottish Company Limited | London | 2003 |
| CÚ Chulainn Group Ltd | Newry | 2023 |
| D & a Consultancy Partnership Limited | Worthing | 2022 |
| D & a Dickinson Limited | Ashbourne | 2009 |
| D & a Fenwick Limited | Gainsborough | 2000 |
| D & a Livestock Limited | Harrogate | 2012 |
| D & a Morton Ltd | Cumnock | 2012 |
| D & a Wemyss Ltd | Tain | 2024 |
| D & B Rudd & SON Limited | Northwich | 2002 |
| D & C Farming Limited | Antrim | 2025 |
| D & C Fawcett Ltd | Penrith | 2006 |
| D & C Lockhart (Holdings) Limited | Sutton Coldfield | 2015 |
| D & C Lowe & Sons Ltd | Dronfield | 2019 |
| D & C Poultry Limited | Maghera | 2020 |
| D & C Price Ltd | Llandrindod Wells | 2025 |
| D & C Robinson Ltd | Cumnock | 2024 |
| D & D (Forestry) Ltd. | Glasgow | 2005 |
| D & D Farms Limited | Basildon | 2021 |
| D & D Mathie Limited | Fife | 2006 |
| D & D Wallbank Contractors Ltd | Accrington | 2003 |
| D & EM Woolley Limited | Monyash | 2022 |
| D & F Mccallum Ltd | Doncaster | 2014 |
| D & G A'Bear Farming Limited | Devizes | 2004 |
| D & G Hooftrimming Ltd | Thornhill | 2019 |
| D & G Innes Fishing Co. Ltd. | Buckie | 2003 |
| D & G Reid Company Limited | Lisburn | 2014 |
| D & H Dairying Limited | Shaftesbury | 2021 |
| D & H Harries Limited | Llanfyrnach | 2018 |
| D & H Stoddart Limited | Penicuik | 2005 |
| D & J Cheesbrough & SON Limited | Ryton | 2019 |
| D & J Collier Limited | Longcross | 2024 |
| D & J Moseley Limited | Stoke-On-Trent | 2015 |
| D & J Wadsley Limited | Wisbech | 2022 |
| D & K Morgan | Orkney | 2014 |
| D & K W Holdings Ltd | Sowerby Bridge | 2025 |
| D & L Correale and Sons Limited | Billingshurst | 2012 |
| D & L Farms Ltd | Nottingham Business Park | 2018 |