| Carthorse Dolphin Limited | Middlesbrough | 2025 |
| Carthovel Limited | Daventry | 2024 |
| Carthy Ventures Holdings Limited | Stafford | 2024 |
| Cartimos Ltd | London | 2023 |
| Cartledge Holdings Limited | Ripley | 2023 |
| Cartlidge Investments Ltd | Doncaster | 2025 |
| Cartlidge Morland Limited | Kingston Upon Thames | 1998 |
| Cartmel Investments Limited | Cartmel | 1979 |
| Cartmel Mortgages Limited | London | 2019 |
| Cartmell Holdings Limited | Birmingham | 2002 |
| Cartmellor Limited | Rochdale | 2016 |
| Carton Hydro Limited | Waterlooville | 2023 |
| Cartonage Holdings Limited | Leeds | 2026 |
| Cartor Holdings Ltd | Wolverhampton | 2018 |
| Cartref Financial Services Limited | Llanelli | 2014 |
| Cartref Hapus Limited | Carmarthen | 2022 |
| Cartref Mortgages Limited | Denbigh | 2016 |
| Cartwheel Holdings Limited | Redditch | 2018 |
| Cartwheel International Limited | Ilford | 2014 |
| Cartwright Benefit Consultants Ltd | Farnborough | 2012 |
| Cartwright FIC Limited | Chester | 2023 |
| Cartwright Financial Solutions Ltd | Farnborough | 2012 |
| Cartwright Group Limited | Farnborough | 2008 |
| Cartwright Hands Holdings Limited | Nuneaton | 2020 |
| Cartwright Holdings Ltd | Manchester | 2026 |
| Cartyfire Ltd | Newton Aycliffe | 2020 |
| Caruana Ltd | Salisbury | 2019 |
| Caruso (UK) Limited | Felsted | 2003 |
| Caruso Partners Limited | London | 2012 |
| Carval Investors UK Limited | London | 2006 |
| Carvalho Holdings Limited | Crawley | 2020 |
| Carvalho Investments Ltd | Leicester | 2016 |
| Carvantrav Advisory Ltd | Hounslow/Greater London | 2022 |
| Carve Holdings UK Limited | Enfield | 2019 |
| Carvell Holdings Ltd | Godalming | 2013 |
| Carvemore Limited | Hailsham | 2025 |
| Carver Consulting International Limited | Hindhead | 2004 |
| Carver Engineering Holdings Limited | Doncaster | 2013 |
| Carver Holdings Limited | Wolverhampton | 2018 |
| Carvermor Holdings Limited | Croydon | 2026 |
| Carvers Holdings Limited | London | 2023 |
| Carvest Ltd | London | 2026 |
| Carvi Holding Ltd | High Wycombe | 2023 |
| Carvum Limited | Bury St. Edmunds | 2025 |
| Carward Investments | Stafford | 2023 |
| Carxperty Ltd | Chessington | 2020 |
| Cary UK Holding Ltd | Chesterfield | 2018 |
| Carz Holdings Ltd | Salford | 2025 |
| Carzoom Ltd | Cardiff | 2019 |
| CAS (Holdings) Scotland Ltd | Glasgow | 2024 |
| CAS Apex Holdings Ltd | Omagh | 2023 |
| CAS Aspirations Properties Limited | West Malling | 2008 |
| CAS Bridging & Commercial Finance Ltd | Stanmore | 2014 |
| CAS Financial Planning Ltd | Harpenden | 2021 |
| CAS Group Holdings Ltd | Cambridge | 2003 |
| CAS Holdings Limited | Harrow | 2015 |
| CAS House Holding Limited | London | 2023 |
| CAS Insurance Services Ltd | Ipswich | 1997 |
| CAS Mortgages Ltd | Slough | 2020 |
| CAS Property Investments Ltd | Shipston Upon Stour | 2013 |
| CAS9 Limited | London | 2025 |
| Casa (SW) Limited | Newton Abbot | 2022 |
| Casa Alta Consulting Ltd | London | 2024 |
| Casa Antonio Equity Holdings Ltd | Bedfordshire | 2024 |
| Casa BE Limited | Sheffield | 2011 |
| Casa Bianca Hospitality Group Ltd | London | 2026 |
| Casa Brasil (Holdings) Limited | Southampton | 2015 |
| Casa Brasil (Port Solent Holdings) Limited | Southampton | 2020 |
| Casa Capital Investments Limited | Basingstoke | 2019 |
| Casa Chai Capital Limited | London | 2025 |
| Casa Collective Ltd | London | 2019 |
| Casa DEI Bambini Ltd. | London | 2000 |
| Casa Dental Group Limited | Bristol | 2023 |
| Casa Dental Limited | Bristol | 2021 |
| Casa Environmental Holdings Ltd | Bristol | 2025 |
| Casa Fabi Ltd | Cheadle | 2018 |
| Casa Global Investments Ltd | Marlow | 2019 |
| Casa Group Holdings Limited | Seaham | 2016 |
| Casa Guggenheim Limited | London | 2025 |
| Casa Holding Group Limited | London | 2025 |
| Casa Lory Ltd | North Shields | 2025 |
| Casa Lusk Holdings Limited | London | 2024 |
| Casa Mortgage and Protection Ltd | Stoke-On-Trent | 2023 |
| Casa Prada Ltd | Morecambe | 2025 |
| Casa Site 2 Limited | Bristol | 2023 |
| Casa Spinola Capital Ltd | Mitcham | 2025 |
| Casa TUA Ltd | London | 2017 |
| Casa UK Mortgages Ltd | Nottingham | 2025 |
| Casa XFL Ltd | Ware | 2015 |
| Casa-Londra Real Estate Limited | London | 2014 |
| Casablanca Holdings Limited | London | 2019 |
| Casacode Ltd | Huntingdon | 2026 |
| Casacourt Ltd | Rochford | 2023 |
| Casadron Holdings Ltd | Dudley | 2025 |
| Casafari Europe Ltd | London | 2016 |
| Casafex Bureau DE Change Limited | Barking | 2020 |
| Casaforte Limited | Poole | 2025 |
| Casagrande Holdings Ltd | Rotherham | 2017 |
| Casahxm Limited | London | 2025 |
| Casal Living Limited | Poole | 2024 |