| Cartwright Pictures Ltd | Redhill | 2023 |
| Cartwright Productions Ltd | London | 2010 |
| Caru Coed Ltd | London | 2025 |
| Carus Green Limited | Kendal | 2010 |
| Carved Soul Ltd. | London | 2016 |
| Carver on Stage Ltd | Thames Ditton | 2023 |
| Carvill-Jackman Arts Ltd | Bridlington | 2025 |
| Carving Community CIC | Crediton | 2011 |
| Carwash Clubs Limited | Edgware | 2002 |
| Cary Comes Home Ltd | Bristol | 2013 |
| Caryatid Heritage & Culture Limited | Witney | 2025 |
| Caryl Harris Associates Limited | London | 1971 |
| Caryn Wright Ltd | Haywards Heath | 2007 |
| Carys & Knightley Ltd | Birmingham | 2025 |
| Carys Artistries Limited | Sheffield | 2018 |
| Carys Evans Music Ltd | Bedford | 2025 |
| Carys Media Ltd | Guildford | 2025 |
| Carys Studio Limited | Guildford | 2025 |
| CAS Bronze Limited | London | 2025 |
| CAS PT Limited | High Wycombe | 2015 |
| Casa Amigos FC Ltd | London | 2026 |
| Casa Beni Limited | London | 2025 |
| Casa Camp Limited | Wimborne | 2015 |
| Casa Chisme Ltd | London | 2026 |
| Casa Colombo Limited | Birmingham | 2021 |
| Casa DE Aura Ltd | London | 2024 |
| Casa DE Padel Club Ltd | London | 2025 |
| Casa DE Salsa Limited | London | 2021 |
| Casa DEL Padel Limited | Malton | 2024 |
| Casa DEL Padel MK Limited | Milton Keynes | 2024 |
| Casa Diablo Tattoo Ltd | Portsmouth | 2023 |
| Casa DO Benfica EM Londres Limited | London | 2015 |
| Casa DO SOL Limited | Southsea | 2025 |
| Casa MIA Film Ltd | London | 2025 |
| Casa Music Group Limited | Plymouth | 2018 |
| Casa NBO Limited | London | 2025 |
| Casa Nueva Music Ltd | Nottingham | 2025 |
| Casa Padel Group Limited | Tamworth | 2026 |
| Casa Padel Ltd | Farnham | 2024 |
| Casa Pilates Ltd | Whitehouse | 2026 |
| Casa Sports Academy Ltd | Wimborne | 2007 |
| Casa Strada Productions Ltd. | Derby | 2006 |
| Casa Theatre Festival Limited | London | 2010 |
| Casa-D Limited | London | 2011 |
| Casa-D Productions Limited | London | 2012 |
| Casablanca Events Limited | Kingston Upon Thames | 2025 |
| Casablanca Publications Limited | Jarrow | 2006 |
| Casaluz Creative Ltd | London | 2020 |
| Casasonora Ltd | Chester | 2025 |
| Casbah Fitness Ltd | Knutsford | 2025 |
| Casbah Productions Limited | 3 Dorset Rise | 1980 |
| Cascade Editions Ltd | London | 2022 |
| Cascade Events Limited | Banbury | 2001 |
| Cascade Media Development Limited | Wymondham | 2012 |
| Cascadessportsbook Limited | London | 2024 |
| Cascading Leisure Centre Limited | Shepperton | 2005 |
| Case Amusements Limited | Bridgend | 2024 |
| Case Productions CIC | Leeds | 2025 |
| Casefiles Ltd | Rayleigh, Essex | 2019 |
| Caseley Performance Limited | Bridgend | 2021 |
| Casemates Studios Limited | Portsmouth | 2020 |
| Casera Limited | Clacton-On-Sea | 2006 |
| Casey Creative Limited | Middlesex | 2004 |
| Casey O'Gorman Racing Limited | Erith | 2026 |
| Casey Pettit Coaching Academy Limited | Erith | 2020 |
| Casey Waring Personal Training Ltd | Stockton-On-Tees | 2025 |
| Casey’S Castles and Event Hire Ltd | Preston | 2022 |
| Cash & Carry Studio Ltd | London | 2016 |
| Cash Capital Competitions Ltd | Glasgow | 2026 |
| Cash Cash Comp Limited | Milford Haven | 2025 |
| Cash City Draws Ltd | Market Harborough | 2025 |
| Cash Cortex Competitions Ltd | Manchester | 2025 |
| Cash Fall Amusements Limited | West Bromwich | 2013 |
| Cash for Chances Competitions Limited | Edinburgh | 2025 |
| Cash Kingdom Ltd | Eyemouth | 2025 |
| Cash Motto Limited | London | 2009 |
| Cash OUT Entertainment Ltd | Stockton-On-Tees | 2025 |
| Cash Pact Ltd | London | 2025 |
| CASH48 Ltd | Tamworth | 2023 |
| Cashdown Racing Limited | Bridgnorth | 2002 |
| Cashew Planet Limited | London | 2026 |
| Cashflowstudios Limited | London | 2020 |
| Cashma Limited | Southport | 2025 |
| Cashmere Thoughts Limited | Sevenoaks | 2023 |
| Cashmore Limited | Mountsorrel | 2013 |
| Cashmule Comps Ltd | Congleton | 2025 |
| Cashprint Limited | Wimbledon | 1989 |
| Casi Entertainment Ltd | London | 2021 |
| Casinha Tattoo Studio Ltd | Barry | 2024 |
| Casino Films Limited | Lymington | 1988 |
| Casino Grand Limited | Strabane | 2011 |
| Casino Hire UK Limited | Durham | 2026 |
| Casino MK Limited | Milton Keynes | 2018 |
| Casino Music Limited | Macclesfield | 2003 |
| Casino Palace Ltd | Co Down | 2004 |
| Casino Royele Magherafelt Ltd | Magherafelt | 2021 |
| Casino Select Limited | Newton Abbot | 2006 |
| Casino Shop Limited | | 2002 |
| Casinos of Mayfair International Ltd | Bexhill-On-Sea | 1996 |
| Caskandcountrycomps Limited | Chepstow | 2026 |