| Cartiva Ltd | London | 2025 |
| Cartlidge Levene Investments Limited | Barnet | 1987 |
| Cartmel Care Limited | Kendal | 2017 |
| Cartmel Productions Limited | Wigan | 2017 |
| Cartmell & Barlow Limited | Preston | 1998 |
| Cartmell Shepherd Trust Company Limited | Carlisle | 2020 |
| Carto Coders Ltd | London | 2024 |
| Carton Technical Services Ltd | Stockport | 2021 |
| Carts in the Dog House Limited | Worcester | 2018 |
| Cartwheeled Ltd | Barrow-In-Furness | 2020 |
| Cartwright 4525 Limited | West Bromwich | 2025 |
| Cartwright Language Services Limited | Halesowen | 2002 |
| Cartwright Property Associates Ltd | Woodbridge | 2013 |
| Carty 1 Caribbean Caterers Ltd | London | 2022 |
| Cartzaa Ltd | London | 2025 |
| Cart’Any Ltd | Gainsborough | 2025 |
| Caru Pets Services Ltd | Newport | 2026 |
| Caruana Production Services Limited | London | 2011 |
| Caruaru Ltd | Telford | 2022 |
| Caruhasa Ltd | Telford | 2020 |
| Carus Animal Health Limited | Stevenage | 2017 |
| Carvalho Productions Limited | London | 2023 |
| Carve Construction Management Limited | Cambridge | 2021 |
| Carved by Carbie Ltd | Aberdeen | 2022 |
| Carvello Woodscutt Limited | Hertfordshire | 2001 |
| Carver’S Events Ltd | Trowbridge | 2021 |
| Carveth Productions Limited | Harrow | 1982 |
| Carvill & Arcari Limited | Glasgow | 1988 |
| Carvin Baker Ltd | Birmingham | 2018 |
| Carwal Limited | Nelson | 2021 |
| Carwash Leagarve Ltd | Luton | 2023 |
| Carwash Palace Farm Ltd | Bath | 2022 |
| Carwash World Ltd | Coventry | 2025 |
| Carwood Investments | Chester | 2023 |
| Carworx Solihull Ltd | Solihull | 2017 |
| Carz Express Services Limited | London | 2025 |
| Carzana Interiors Limited | Hastings | 2001 |
| CAS Cool Air Services Ltd | Glasgow | 2016 |
| CAS Homes Ltd | London | 2017 |
| CAS Marine Ltd | Shetland | 2018 |
| CAS Styling Limited | Wakefield | 2025 |
| CAS Yachting Limited | Fareham | 2026 |
| Casa 212 Ltd | Ruislip, | 2024 |
| Casa Aurelia Ltd | London | 2026 |
| Casa Bella Blinds Ltd | Thatcham | 2013 |
| Casa Bella London Ltd | London | 2023 |
| Casa Bella Sorella Limited | Doncaster | 2015 |
| Casa Blue Studio Ltd | Shrewsbury | 2025 |
| Casa Bonita Essex Ltd | Clacton On Sea | 2024 |
| Casa Cupping Ltd | Glasgow | 2026 |
| Casa DE Lila Limited | London | 2023 |
| Casa DE Moçambique United Kingdom Community Interest Company | Hounslow | 2021 |
| Casa DE Oracion UK Ltd | Mitcham | 2020 |
| Casa DI Dolci Limited | Hatfield | 2012 |
| Casa DI LEI Interiors Ltd | London | 2018 |
| Casa Golf Homes Limited | Newcastle Upon Tyne | 2012 |
| Casa Hair & Beauty Limited | Nottingham | 2004 |
| Casa Hair and Aesthetics Ltd | Rickmansworth | 2025 |
| Casa in Particular Limited | London | 2014 |
| Casa Luxe Directors Limited | Saffron Walden | 2026 |
| Casa Matrix Ltd | Sevenoaks | 2018 |
| Casa MIA Property Management Limited | London | 2005 |
| Casa Nossa Limited | East Molesey | 2023 |
| Casa Pelo Limited | Redland | 2010 |
| Casa Pro Ltd | Stevenage | 2024 |
| Casa Projects LND Ltd | London | 2025 |
| Casa Skin Clinic Ltd | Leeds | 2025 |
| Casa Solutions Ltd | Fleet | 2024 |
| Casa Spa Limited | | 1993 |
| Casa Tattoo Ltd | Leeds | 2025 |
| Casa Technologies Limited | London | 2023 |
| Casa Tejon Limited | Edinburgh | 2023 |
| Casa Trading Ltd | London | 2024 |
| Casa Verde Limited | London | 2015 |
| Casa Vittoria Limited | London | 2019 |
| Casabella House of Beauty Limited | Sudbury | 2014 |
| Casablanca Hair Dressers Ltd | Dewsbury | 2025 |
| Casaborgy Limited | South Croydon | 2016 |
| Casacarta Limited | London | 2015 |
| Casae Limited | Radlett | 2016 |
| Casah Ltd | Bellshill | 2025 |
| Casaloca Events Ltd | London | 2024 |
| Casals Limited | Southend On Sea | 2003 |
| Casaraclinic Limited | Edgware | 2022 |
| Casasola Limited | Stoke-On-Trent | 2011 |
| Casavano.Decor Ltd | Glasgow | 2020 |
| Casavivant Limited | Solihull | 2018 |
| Casayoga Ltd | Stockton-On-Tees | 2019 |
| Cascada Enterprise Limited | Chessington | 2002 |
| Cascadas Holdings Ltd | Coalville | 2015 |
| Cascade (Scotland) Limited | Irvine | 2012 |
| Cascade Canyon Limited | Hemel Hempstead | 2024 |
| Cascade Hair Salon Limited | Torquay | 2012 |
| Cascade Heights Limited | Leeds | 2017 |
| Cascade North East Limited | Leeds | 2019 |
| Cascade Theatre Company | Newquay | 2000 |
| Cascaidr CIC | Farnham | 2017 |
| Cascie Consultants Limited | Barnsley | 2016 |
| Cascohs Ltd | London | 2025 |
| Casdron Enterprises Limited | Alresford Hampshire | 1988 |