| Car Buyer 247.COM Ltd | Wholesale & retail | 2023 |
| Car Girl Culture Ltd | Wholesale & retail | 2025 |
| Car Look 22 Limited | Wholesale & retail | 2022 |
| Car Maintenance Garages Limited | Wholesale & retail | 2013 |
| Car Scent Ltd | Wholesale & retail | 2025 |
| Caradoc Conditioning Ltd. | Education | 2023 |
| Carbery Lane Management Company Limited | Households | 1999 |
| Carbery Mount Management Limited | Households | 1977 |
| Carbon Neutral Drinks Ltd | Wholesale & retail | 2023 |
| Carbon Vault Limited | Information & communication | 2020 |
| Carbonwurks Ltd | Wholesale & retail | 2015 |
| Carclew Limited | Administrative & support | 1996 |
| Card Comparison UK Limited | Administrative & support | 2021 |
| Card Swap Limited | Information & communication | 2024 |
| Cardigan Road LLP | | 2006 |
| Cardita Property Group Ltd | Real estate | 2023 |
| CARDS2CASH Limited | Wholesale & retail | 2025 |
| CARDS4FLOWERS Ltd | Manufacturing | 2024 |
| Care Dynamics Limited | Health & social care | 2007 |
| Care Homes of Distinction (Wray Park) Limited | Real estate | 2021 |
| Care Purbeck Limited | Health & social care | 2013 |
| Care South | Health & social care | 1990 |
| Carecompare Limited | Professional & scientific | 2010 |
| Career Bridge CIC | Professional & scientific | 2026 |
| Career Coaching Consultancy Ltd | Professional & scientific | 2020 |
| Careercrafter Group Ltd | Information & communication | 2026 |
| Careernet International Limited | Other services | 1999 |
| Carefina UK Limited | Health & social care | 2025 |
| Careshiftsolutions Ltd | Administrative & support | 2025 |
| Careva Solutions Ltd | Professional & scientific | 2023 |
| Carfax U.K Limited | Wholesale & retail | 2025 |
| Cargo Refrigeration Limited | Transport & logistics | 1994 |
| Caring Together Ltd | Professional & scientific | 2016 |
| Caritas Removals Ltd | Wholesale & retail | 2024 |
| Carl Jones Consulting Limited | Information & communication | 2021 |
| Carl Wilson Limited | Professional & scientific | 2002 |
| Carl Wilson Properties Limited | Real estate | 2017 |
| Carlex Advisory Services Limited | Administrative & support | 2020 |
| Carlton Civil Engineering (Group) Limited | Financial services | 2024 |
| Carlton Court (Bournemouth) Management Company Limited | Real estate | 1990 |
| Carlton Valuers Limited | Administrative & support | 2003 |
| Carltonlima Care Ltd | Public administration | 2023 |
| Carmen Nihat Ltd | Manufacturing | 2017 |
| CARNAVI2008 Ltd | Wholesale & retail | 2022 |
| Carobtree Property Management Limited | Wholesale & retail | 2016 |
| Caroline Travel Ltd | Administrative & support | 2026 |
| Carolyn Thorpe Limited | Other services | 2012 |
| Carousel Learning Ltd | Information & communication | 2020 |
| Carpe Jugulum Limited | Administrative & support | 2000 |
| Carpet Universe Limited | Administrative & support | 2024 |
| Carpetly Limited | Construction | 2024 |
| Carrek Holdings Ltd | Financial services | 2023 |
| Carrek Property Ltd | Real estate | 2023 |
| Carrparks Limited | Transport & logistics | 2026 |
| Cartbooster Limited | Information & communication | 2022 |
| Carter Vintners Limited | Professional & scientific | 2012 |
| Carter Wong Design Limited | Administrative & support | 1985 |
| Carver Executive Ltd | Professional & scientific | 2025 |
| Carving Thought Limited | Professional & scientific | 2008 |
| Carwill Ltd | Real estate | 2000 |
| Casa (Bournemouth Road) Limited | Households | 2018 |
| Casa Retreat Ltd | Real estate | 2023 |
| Casaforte Limited | Financial services | 2025 |
| Casal Living Limited | Financial services | 2024 |
| Casatrue Ltd | Real estate | 2025 |
| Cascade Property Developments LLP | | 2008 |
| Cascyra Ltd | Financial services | 2026 |
| Case Design Group LLP | | 2016 |
| Casehappy Limited | Wholesale & retail | 2012 |
| Caserta Restaurants Limited | Hospitality | 2021 |
| Casey Building and Property Maintenance Ltd | Construction | 2024 |
| Cash 4 Coins Limited | Wholesale & retail | 2019 |
| Cash Recycle Limited | Administrative & support | 1997 |
| Cashleighs Ltd | Wholesale & retail | 2022 |
| Cashmere Financial Solutions Limited | Professional & scientific | 2015 |
| Casper Technologies Limited | Wholesale & retail | 2024 |
| Caspian Contractors Ltd | Construction | 2020 |
| Cassy Crabtree Psychology Services Ltd | Health & social care | 2026 |
| Castaway UK Limited | Transport & logistics | 2006 |
| Castle Court Management (Shirley) Limited | Households | 1991 |
| Castle Cove Beach Ltd | Administrative & support | 2022 |
| Castle Farm Care Limited | Health & social care | 2001 |
| Castle Hill Court (Parkstone) Limited | Households | 1975 |
| Castle Hill Heritage Skills CIC | Education | 2024 |
| Castle Lane Clinic Ltd | Health & social care | 2016 |
| Castle Security Systems Ltd | Administrative & support | 2012 |
| Castle Solutions Ltd | Professional & scientific | 2025 |
| Castledine ST Johns Carlisle Ltd | Information & communication | 2018 |
| Castlemania Limited | Arts & recreation | 2003 |
| Castletech Construction (Holdings) Limited | Financial services | 2013 |
| Castletech Fabrications Limited | Construction | 2013 |
| Castletech Projects Ltd | Other services | 2015 |
| Castorea Projects Limited | Real estate | 2021 |
| Castorini Limited | Arts & recreation | 2002 |
| Caswell Software Advisory Ltd | Information & communication | 2026 |
| Catalina Drive (47-50) RTM Company Limited | Households | 2005 |
| Catalogue Marketing UK Limited | Administrative & support | 1998 |
| Catapult (International) Limited | Other services | 2024 |
| Catchg Ltd | Professional & scientific | 2022 |
| Cater Dorset Ltd | Hospitality | 2026 |