| CAD4 Ltd | Construction | 2021 |
| Cadeau Online Ltd | Wholesale & retail | 2015 |
| Cadm Holdings Limited | Financial services | 2019 |
| Cads Properties Limited | Real estate | 2021 |
| Cafe Aldo Limited | Hospitality | 2023 |
| Cafe Beirut Limited | Hospitality | 2023 |
| Cafe Domenica Limited | Hospitality | 2015 |
| Cafe Madeira Limited | Real estate | 1999 |
| Cafe Manon Limited | Manufacturing | 2025 |
| Cafe Salt Ltd | Hospitality | 2020 |
| Cafe ZIO Limited | Hospitality | 2025 |
| CAFEBN2 Ltd | Hospitality | 2019 |
| Cafewerks Limited | Hospitality | 1995 |
| Café DES Couleurs Ltd. | Wholesale & retail | 2022 |
| Cahan Limited | Wholesale & retail | 2017 |
| Cahill Property Investments Ltd | Real estate | 2025 |
| Caillou Real Estate Limited | Real estate | 2016 |
| Caird Homes (Surrey) Limited | Real estate | 2022 |
| Caird Homes Limited | Real estate | 2016 |
| Cairds (Epsom) Limited | Real estate | 2009 |
| Cairds Property Services Limited | Real estate | 2014 |
| Cairo EGY Ltd | Transport & logistics | 2021 |
| Caister Court Residents Association Limited | Real estate | 1961 |
| Cake 'N' Stuff Ltd | Wholesale & retail | 2023 |
| Cake Investments Limited | Real estate | 2025 |
| Calanim Associates Limited | Professional & scientific | 2011 |
| Calbeck Developments Limited | Construction | 2005 |
| Caldmere Advisory Limited | Information & communication | 2025 |
| Caleus London I Holding Limited | Financial services | 2021 |
| Caleus London I Property Limited | Financial services | 2021 |
| Calf 1 GP LLP | | 2023 |
| Calf 1 LP | | 2023 |
| Calf 2 LP | | 2025 |
| Calibre Home and Garden Ltd | Professional & scientific | 2026 |
| Caligari Massage Ltd | Other services | 2019 |
| Call Centre One Limited | Information & communication | 2008 |
| Call Solution Limited | Administrative & support | 2007 |
| Call the Crew Ltd | Construction | 2024 |
| Callaghan Photography Ltd | Professional & scientific | 2017 |
| Callisto Associates Limited | Administrative & support | 2011 |
| Calm Eagle Sports Limited | Arts & recreation | 2018 |
| Calm Stories for Busy Minds Ltd | Information & communication | 2025 |
| Calvert Towers Limited | Households | 1995 |
| Cambridge Financial Partners LLP | | 2003 |
| Cambridge Grove Properties Limited | Real estate | 1996 |
| Cambridge Road LLP | | 2010 |
| Cambridge Science & Technology Consultants Limited | Professional & scientific | 2003 |
| Cambridge Tea Consultancy Ltd | Professional & scientific | 2019 |
| Camden Source Limited | Wholesale & retail | 2001 |
| Camden Woodland Association Limited | Health & social care | 2018 |
| Camel's Sheesha Events Ltd | Other services | 2018 |
| Camel's Sheesha Ltd | Other services | 2015 |
| Camelot Diamonds Limited | Wholesale & retail | 2012 |
| Camelot Jewellery Ltd | Other services | 2014 |
| Cameo Education Limited | Information & communication | 2013 |
| Cameron Education Ltd | Education | 2018 |
| Camie Limited | Real estate | 2015 |
| Camm & Hooper Limited | Hospitality | 2010 |
| Camm & Hooper Waterloo Ltd | Hospitality | 2023 |
| Cammi Technology Ltd | Information & communication | 2023 |
| Camo IT Solutions Limited | Information & communication | 2012 |
| Campaign Collective Ltd | Professional & scientific | 2011 |
| Campbell Stone Consultancy Limited | Professional & scientific | 2017 |
| Campings Luxury Coaches Limited | Real estate | 1956 |
| Campsite Management Ltd | Hospitality | 2016 |
| CAN CAN Creative Ltd | Professional & scientific | 2003 |
| Can-B Media Ltd | Information & communication | 2010 |
| Canaf Investments Ltd | Extraterritorial | 2023 |
| Cancea Trading Company Limited | Administrative & support | 2011 |
| Cancikim Ltd | Hospitality | 2024 |
| Candle and More Ltd | Manufacturing | 2025 |
| Candlelight Catering Ltd | Hospitality | 2026 |
| Candy Records Limited | Arts & recreation | 1993 |
| Candylicious Ltd | Wholesale & retail | 2016 |
| Canelectric Limited | Construction | 2012 |
| Canico Ltd. | Administrative & support | 1997 |
| Canny Films Limited | Information & communication | 2014 |
| Cantata Technology Ltd | Manufacturing | 2011 |
| Canteen Games Ltd | Information & communication | 2022 |
| Cantour Cosmetics Limited | Other services | 2021 |
| Canvins Group Limited | Administrative & support | 2020 |
| Capa First Response CIC | Health & social care | 2020 |
| Capelle Shipping LLP | | 2016 |
| Capinvest Finance Solutions Limited | Financial services | 2024 |
| Capital (Hair and Beauty) Holdings Limited | Wholesale & retail | 2023 |
| Capital (Hair and Beauty) Limited | Wholesale & retail | 1954 |
| Capital Culture Ltd | Professional & scientific | 2003 |
| Capital Exhibitions Ltd | Professional & scientific | 2020 |
| Capital International Staffing Ltd | Administrative & support | 1982 |
| Capital Markets Marketing Ltd | Professional & scientific | 2025 |
| Capital Representatives Limited | Professional & scientific | 2000 |
| Capital UK Group Services Ltd | Professional & scientific | 2020 |
| Capital UK Tax Ltd | Professional & scientific | 2023 |
| Capja Limited | Information & communication | 2018 |
| Cappadocia Guest House Ltd | Hospitality | 2019 |
| Capricorn Property Development Ltd | Construction | 2011 |
| Capriol Films Limited | Information & communication | 2004 |
| Capstone Contractors Ltd | Construction | 2026 |
| Capstone Property Group Limited | Households | 2025 |
| Captain's Cove Limited Partnership | | 2005 |