| Camsure Homes Limited | Professional & scientific | 2006 |
| Camsustainbridge Ltd. | Administrative & support | 2017 |
| Camtech Innovations Limited | Wholesale & retail | 2009 |
| Camtherics Ltd | Professional & scientific | 2013 |
| Camtigris Consulting Limited | Professional & scientific | 2021 |
| Camtrust | Wholesale & retail | 1993 |
| Camvertec Limited | Professional & scientific | 2018 |
| Camvis Ltd | Wholesale & retail | 2003 |
| Camvora Motors Ltd | Wholesale & retail | 2025 |
| Camx CAB Limited | Transport & logistics | 2025 |
| Canada Anrun Biology Co., Limited | Agriculture & fishing | 2023 |
| Canada Esif International Group Limited | Mining & quarrying | 2026 |
| Canada Fengye Chemcial Ltd | Wholesale & retail | 2023 |
| Canada Green Nutrien Chemicals Ltd | Mining & quarrying | 2024 |
| Canada Kelton Mining Group Co., Limited | Extraterritorial | 2023 |
| Canada MAX Crop Nutrition Co., Ltd | Mining & quarrying | 2024 |
| Canada Nicee Greenhouse Gardening Co., Ltd | Mining & quarrying | 2026 |
| Canadian Kaisenrui International Fertilizer Co., Ltd | Mining & quarrying | 2025 |
| Canairy Limited | Manufacturing | 2021 |
| Canal Quarter Management Company Limited | Households | 2019 |
| Canbarrau UK Limited | Real estate | 2025 |
| Cancer, Genomics and Consulting Ltd | Information & communication | 2021 |
| Candid Property Ltd | Professional & scientific | 2022 |
| Candish Limited | Wholesale & retail | 2013 |
| Candlewick Consulting Limited | Professional & scientific | 2022 |
| Candy Clouds 1 Ltd | Wholesale & retail | 2025 |
| Canella Ltd | Information & communication | 2025 |
| Canford Lettings Ltd | Real estate | 2013 |
| Cangxian Tiancheng Pipe Fittings Co., Ltd | Extraterritorial | 2021 |
| Canine Eco Toilet Ltd | Wholesale & retail | 2022 |
| Canley Consulting Ltd | Professional & scientific | 2009 |
| Cannon Tomlinson Mansley Limited | Information & communication | 1999 |
| Canopy Holdings Ltd | Professional & scientific | 2021 |
| Canopy Pact | Professional & scientific | 2024 |
| Canopy Vista Ltd | Construction | 2023 |
| Canopy-Earth Limited | Professional & scientific | 2026 |
| Canopy: Sustainability Consulting Limited | Professional & scientific | 2019 |
| Canopyuk Limited | Construction | 2020 |
| Canossa UK Ltd | Wholesale & retail | 2020 |
| Cantab Anaesthesia Ltd | Health & social care | 2013 |
| Cantab Catering Limited | Administrative & support | 2003 |
| Cantab Cognition Ltd | Financial services | 2019 |
| Cantab Design Ltd | Professional & scientific | 2003 |
| Cantab Education Limited | Education | 2021 |
| Cantab Films Ltd | Information & communication | 2004 |
| Cantab Health Innovations Limited | Professional & scientific | 2025 |
| Cantab MED Ltd | Health & social care | 2022 |
| Cantab Millennium Services Ltd | Information & communication | 2007 |
| Cantab Predictive Intelligence Ltd | Professional & scientific | 2017 |
| Cantab Projects Ltd | Professional & scientific | 2023 |
| Cantab Research Limited | Information & communication | 2006 |
| Cantab Software Limited | Information & communication | 1996 |
| Cantabarte Ltd | Wholesale & retail | 2023 |
| Cantabile Publications Limited | Arts & recreation | 2014 |
| Cantabrigia Advisors Ltd | Professional & scientific | 2011 |
| Cantabrigia Education Ltd | Education | 2025 |
| Cantabrigian Imaging Ltd | Health & social care | 2021 |
| Cantabrigian Limited | Arts & recreation | 1995 |
| Cantelupe Developments Cambridge LLP | | 2011 |
| Cantelupe Developments Limited | Extraterritorial | 2011 |
| Canterbury Court (Cambridge) Residents Association Limited | Real estate | 1984 |
| Canterbury Court (Northampton) Management Company Limited | Households | 2002 |
| Canterbury Gardens (Knights) RTM Company Ltd | Households | 2026 |
| Canterbury Gardens (Reeves) RTM Company Limited | Households | 2026 |
| Canterbury Punting Company Limited | Transport & logistics | 2009 |
| Cape Europe Applications Engineering Ltd | Professional & scientific | 2013 |
| Cape Europe Limited | Manufacturing | 2021 |
| Capika Collective Ltd | Professional & scientific | 2026 |
| Capinna Ltd | Manufacturing | 2023 |
| Capital Agri International Ltd | Agriculture & fishing | 2017 |
| Capital Car Care (UK) Ltd | Wholesale & retail | 2014 |
| Capital Impact Limited | Professional & scientific | 2016 |
| Capital Property Management Limited | Real estate | 1990 |
| Cappell Trading Company Ltd | Real estate | 2018 |
| Capricorn Taurus Property Ltd | Real estate | 2025 |
| Capsea Limited | Real estate | 2022 |
| Capss Investment Group Ltd | Construction | 2025 |
| Capstone Fields (Hardwick) Management Company Limited | Households | 2021 |
| Car Cambridge Limited | Wholesale & retail | 2025 |
| Car Design Research Ltd | Professional & scientific | 2000 |
| Cara Coffee Limited | Hospitality | 2019 |
| Carat Computer Systems Limited | Information & communication | 1998 |
| Caratiff Investment Group (UK) Limited | Manufacturing | 2018 |
| Carben Farm Holdings Limited | Professional & scientific | 1995 |
| Carbon & Paint Services Ltd | Manufacturing | 2019 |
| Carbon Instincts Artificial Intelligence Ltd | Information & communication | 2023 |
| Carbon Negative Concrete Ltd | Professional & scientific | 2025 |
| Carbon Race Composites Ltd | Manufacturing | 2026 |
| Carbon Works Ltd | Manufacturing | 2024 |
| CARBON13 (CLG) Limited | Education | 2020 |
| CARBON13 Capital Ltd | Administrative & support | 2019 |
| CARBON13 Group Ltd | Administrative & support | 2022 |
| CARBON13 I GP LLP | | 2023 |
| CARBON13 I LP | | 2023 |
| CARBON13 Venture Builder Ltd | Administrative & support | 2022 |
| CARBON75 Ltd | Manufacturing | 2023 |
| Carbonizer (Composites Racing) Ltd | Manufacturing | 2026 |
| Carbontechnologi Ltd | Manufacturing | 2026 |
| Carbridge AI Ltd | Information & communication | 2025 |
| Card Fiends Limited | Wholesale & retail | 2025 |