| Caja Verde Limited | Water & waste | 2017 |
| Cake Charms Limited | Other services | 2010 |
| Cala Tiling Ltd | Wholesale & retail | 2023 |
| Calderbank Developments Limited | Real estate | 2011 |
| Caledonian House RTM Company Limited | Households | 2025 |
| Calenean Limited | Professional & scientific | 2013 |
| Calgray Limited | Information & communication | 2025 |
| Calibre Limited | Professional & scientific | 2004 |
| Calibre Property Limited | Real estate | 2025 |
| Call 4 Concrete Limited | Wholesale & retail | 2018 |
| Calle Film Limited | Information & communication | 2016 |
| Calling for Creativity Limited | Professional & scientific | 2022 |
| Callio Ltd | Wholesale & retail | 2022 |
| Callum Smillie Plasterers Ltd | Construction | 2019 |
| Calmar Consulting Ltd | Professional & scientific | 2013 |
| Calonia Ltd | Other services | 2013 |
| Calshaw Properties Limited | Administrative & support | 2001 |
| Calvers Pubs Ltd | Hospitality | 2023 |
| CAM Developments (Yorkshire) Ltd | Construction | 2023 |
| CAM Suppliers Ltd | Wholesale & retail | 2016 |
| Camari Professional Advisory Services Limited | Professional & scientific | 2024 |
| Camborne Consulting Ltd | Professional & scientific | 2018 |
| Cambridge Green Fuels Ltd | Professional & scientific | 2023 |
| Camco Films Limited | Information & communication | 2016 |
| Camellia&Cocare Ltd | Administrative & support | 2023 |
| Camelot Construction Limited | Construction | 2004 |
| Cameron Construct Limited | Construction | 2019 |
| Camia Properties Ltd | Real estate | 2026 |
| Caminetto Ltd | Construction | 2013 |
| Campervan Retreats Ltd | Hospitality | 2025 |
| Camphora Wellbeing Limited | Other services | 2022 |
| Camrass Wills Limited | Professional & scientific | 2012 |
| CAN DO Ventures Limited | Information & communication | 2009 |
| Canbrick Ltd | Construction | 2012 |
| Canbury Management Limited | Real estate | 2002 |
| Canbury Place Management Company (NO.3) Limited | Households | 1998 |
| Canbury Place Management Company (Trent House) Limited | Households | 2005 |
| Candid Founders Ltd | Professional & scientific | 2024 |
| Candido Care Consultancy Limited | Professional & scientific | 2024 |
| Candlelight Sourcers Limited | Real estate | 2025 |
| Candour Brunel Investco LLP | | 2019 |
| Candy Floss Fantasy Ltd | Other services | 2024 |
| Canine Kindergarten Limited | Professional & scientific | 2023 |
| Canopy Creative Ltd | Professional & scientific | 2020 |
| Canterbury Beds Limited | Extraterritorial | 1999 |
| Canterbury Gynaecologist Limited | Health & social care | 2022 |
| Canterbury Pharmacies Limited | Wholesale & retail | 1994 |
| Canterbury Roofing & Building Specialists Ltd | Construction | 2013 |
| Cantium Catering Consultancy Ltd | Professional & scientific | 2021 |
| Cantium Construction & Refurbishments Ltd | Construction | 2025 |
| Cantium Group Limited | Real estate | 2018 |
| Cantium Properties Ltd | Real estate | 2025 |
| Cantium Property Finance Ltd | Financial services | 2023 |
| Cantium Technology Limited | Information & communication | 2011 |
| Cantium Wealth Management Limited | Financial services | 2018 |
| Canvins Holdings Limited | Extraterritorial | 2022 |
| Canyon Properties Limited | Real estate | 2020 |
| CAP TAP BLB Ltd | Wholesale & retail | 2026 |
| Capcyber Limited | Information & communication | 2025 |
| Capex Funding Limited | Extraterritorial | 2009 |
| Capital Agency London Ltd | Construction | 2018 |
| Capital Books (UK) Limited | Professional & scientific | 2009 |
| Capital Books Business Advisory Limited | Professional & scientific | 2015 |
| Capital Books Nexus Ltd | Professional & scientific | 2014 |
| Capital Cleaning and Maintenance (South East) Limited | Administrative & support | 2018 |
| Capital Fireproofing Limited | Construction | 2018 |
| Capital Integrators Ltd | Financial services | 2023 |
| Capital Jobs Limited | Construction | 2014 |
| Capital London Associates (UK) Ltd | Administrative & support | 2025 |
| Capital Trading & Investment Group Ltd | Hospitality | 2020 |
| Capstone International Limited | Administrative & support | 2005 |
| Captain Rugwash Limited | Administrative & support | 2011 |
| Captax Group Ltd | Professional & scientific | 2020 |
| Captiphi Limited | Information & communication | 2011 |
| Captivating ME Ltd | Education | 2026 |
| Capture Design and Build Limited | Professional & scientific | 2016 |
| Capture London Ltd | Professional & scientific | 2024 |
| Capture Outsourcing Limited | Administrative & support | 2022 |
| Car-Go Car Sales Ltd | Wholesale & retail | 2025 |
| Cara Fitness and Events Ltd | Arts & recreation | 2025 |
| Carace Ltd | Hospitality | 2023 |
| Carat Solutions Ltd | Health & social care | 2023 |
| Caraway Heights Management Limited | Households | 1998 |
| Caraway Heights RTM Company Limited | Households | 2009 |
| Carbon Customs Ltd | Manufacturing | 2020 |
| Carbon Marketing Limited | Administrative & support | 1995 |
| Carbon Motive Limited | Wholesale & retail | 2007 |
| CARBON3 Ltd | Construction | 2019 |
| Cardmate Ltd | Wholesale & retail | 2025 |
| Care & Dignity Limited | Health & social care | 2024 |
| Care Best Ltd | Hospitality | 2017 |
| Care Custom Ltd | Health & social care | 2014 |
| Care Homes Kent Limited | Administrative & support | 2023 |
| Care Solutions Kent Limited | Health & social care | 2023 |
| Carefree Future Solutions Limited | Health & social care | 2018 |
| Caregatewayrecruitment Ltd | Administrative & support | 2024 |
| Careif | Health & social care | 2007 |
| Careline Care Limited | Health & social care | 2017 |
| Careline Care Monitoring Limited | Professional & scientific | 2022 |
| Carepass Limited | Health & social care | 2021 |