| Caballus Home Care Limited | Health & social care | 2019 |
| Cableway Ltd | Construction | 2012 |
| Caddy Systems Limited | Information & communication | 2017 |
| Cadence Investments Ltd | Real estate | 2018 |
| Cadenza Transport Consulting Limited | Professional & scientific | 2015 |
| Cadham Limited | Professional & scientific | 2016 |
| Cafe Bliss Ltd | Hospitality | 2025 |
| Cafe Linea Ltd | Wholesale & retail | 2023 |
| Cafe Rico (Ewell) Limited | Hospitality | 2024 |
| CAFE1EPSOM Ltd | Hospitality | 2023 |
| Caiger Galleries Ltd | Arts & recreation | 2013 |
| Cake Consulting Ltd | Professional & scientific | 2014 |
| Cake Lovers Studio Limited | Information & communication | 2015 |
| Caldwell Land Ltd | Real estate | 2013 |
| Cali Consulting Limited | Professional & scientific | 2023 |
| Calibre Building Services Limited | Real estate | 2011 |
| Calibre Redhill Limited | Financial services | 2013 |
| California Energy Limited | Energy | 2019 |
| Calista Ltd | Professional & scientific | 2023 |
| Call 4 Electrical Ltd | Construction | 2015 |
| Callaghan Plumbing and Heating Limited | Construction | 2026 |
| Callum Macarty Tennis Limited | Education | 2025 |
| Calsec Limited | Professional & scientific | 2001 |
| Camber Management Limited | Extraterritorial | 2006 |
| Cambermaze Limited | Information & communication | 1991 |
| Camberwell Grill 11 Ltd | Hospitality | 2025 |
| Camborne Court Residents Association Limited | Households | 1987 |
| Camelia Care Epsom Ltd | Health & social care | 2022 |
| Camelot Business Systems UK Limited | Information & communication | 1996 |
| Camera Crew London Limited | Information & communication | 2005 |
| Campbell Security (South East) Limited | Construction | 2013 |
| Campervan Culture Limited | Professional & scientific | 2014 |
| Campora Limited | Wholesale & retail | 2025 |
| Camrose Investments Ltd | Real estate | 2024 |
| Canadian & Butler Limited | Extraterritorial | 2000 |
| Canadian & Crawley Limited | Real estate | 2024 |
| Canadian & Kingston Limited | Real estate | 2025 |
| Canadian & Northampton Limited | Real estate | 2024 |
| Canadian & Portland Developments Limited | Real estate | 1995 |
| Canadian & Portland Estates (Holdings) Limited | Financial services | 2014 |
| Canadian & Portland Estates Limited | Real estate | 1982 |
| Canadian & Reading Limited | Real estate | 2024 |
| Canadian & Riverside Estates Limited | Real estate | 2014 |
| Canadian & Tewkesbury Limited | Real estate | 2024 |
| Canadian & West END Limited | Real estate | 2016 |
| Canal Wharf House Management Company Ltd | Households | 2022 |
| Candey Solutions Ltd | Professional & scientific | 2023 |
| Candy Tours Ltd | Transport & logistics | 2015 |
| Cannon Publishing Management Limited | Information & communication | 2020 |
| Cannons Accountancy Limited | Professional & scientific | 2025 |
| Cannons Adventures Limited | Arts & recreation | 1989 |
| Cannons Covent Garden Limited | Arts & recreation | 1981 |
| Cannons Group Limited | Administrative & support | 1943 |
| Cannons Health Clubs Limited | Arts & recreation | 1998 |
| Cannons Sports Clubs (U.K.) Limited | Arts & recreation | 1979 |
| Cantor Technologies Ltd. | Professional & scientific | 2006 |
| Canute Court Freehold Company Limited | Real estate | 2005 |
| Canute Court Management Company Limited | Real estate | 1986 |
| Cape Villas Ltd | Hospitality | 2023 |
| Capehall Limited | Information & communication | 1998 |
| Capehall Property Services Limited | Real estate | 2006 |
| Capital & Co (Accountants) Limited | Financial services | 2013 |
| Capital Alliance Advisors Ltd | Financial services | 2021 |
| Capital Analytics Partners LLP | | 2012 |
| Capital Current Ltd | Construction | 2023 |
| Capital Kitchen Collective Limited | Hospitality | 2025 |
| Capital London Recruitment Ltd | Other services | 2018 |
| Capital Safety Solutions Limited | Administrative & support | 2015 |
| Capmoat Holdings Limited | Professional & scientific | 2025 |
| Capmoat Limited | Professional & scientific | 2025 |
| Cappa Epsom Ltd | Hospitality | 2021 |
| Cappa Wood Flooring Ltd | Construction | 2023 |
| Caprihan Consulting Ltd | Professional & scientific | 2021 |
| Captec Developments Limited | Real estate | 2017 |
| Captec Investments Limited | Financial services | 2015 |
| Capture IT Services and Consulting UK Limited | Information & communication | 2016 |
| Car Sounds & Security Limited | Wholesale & retail | 2004 |
| Carbon & Finch Recruitment Ltd | Administrative & support | 2022 |
| Carbon and Finch Ltd | Information & communication | 2009 |
| Carbon London Limited | Professional & scientific | 2024 |
| Carbon Neutral Resin Solution Ltd | Construction | 2025 |
| Cardea Decor Ltd | Real estate | 2026 |
| Cardinal (Tanglewood) Limited | Real estate | 2022 |
| Cardinal International Limited | Professional & scientific | 1981 |
| Care & Grace Services Ltd | Wholesale & retail | 2026 |
| Care Acclaimed Limited | Health & social care | 2020 |
| Care and Climate Ltd | Arts & recreation | 2022 |
| Carelodges Group Limited | Real estate | 2022 |
| Cargo Incident Notification System Limited | Other services | 2014 |
| Cargreen Limited | Professional & scientific | 2012 |
| Carkey Properties Ltd | Real estate | 2024 |
| Carlton Court RTM Company Limited | Households | 2019 |
| Carlton Dene (Management) Limited | Extraterritorial | 1999 |
| Carlton Property Guards Limited | Administrative & support | 2019 |
| Carlton Towers (Wrythe Green) Limited | Real estate | 1965 |
| Carmel (Group) Limited | Professional & scientific | 2011 |
| Carmel (UK) Limited | Construction | 2004 |
| Carmel MEP Consulting Ltd | Professional & scientific | 2015 |
| Carmel Proco Limited | Real estate | 2026 |
| Caro Gates Ltd | Information & communication | 2016 |