| C&P Insurance Services Ltd | Financial services | 2015 |
| C2O Limited | Construction | 2004 |
| C2O Media Ltd | Professional & scientific | 2008 |
| CAE Food Consultancy Limited | Hospitality | 2019 |
| Caferacing Limited | Arts & recreation | 2002 |
| Calder House Developments Limited | Construction | 1988 |
| Calder House Estates Limited | Extraterritorial | 1988 |
| Calder House Properties Limited | Extraterritorial | 1988 |
| Calzone New Market Limited | Hospitality | 2024 |
| Cambproperty Ltd | Real estate | 2013 |
| Cambridge Accountancy Ltd | Professional & scientific | 2003 |
| Cambridge Aesthetics Ltd | Other services | 2025 |
| Cambridge AI Academy Limited | Education | 2025 |
| Cambridge AI Works Limited | Information & communication | 2026 |
| Cambridge and Newmarket Storage Ltd | Transport & logistics | 2022 |
| Cambridge Artisan Design Limited | Manufacturing | 2017 |
| Cambridge China Innovation Center Limited | Administrative & support | 2015 |
| Cambridge Cobras FC Ltd | Education | 2022 |
| Cambridge Consulting Ltd | Information & communication | 2023 |
| Cambridge Cooling Services Ltd | Energy | 2015 |
| Cambridge Detective Agency Limited | Administrative & support | 2003 |
| Cambridge Educational Services Limited | Education | 2004 |
| Cambridge Edutech Limited | Professional & scientific | 2004 |
| Cambridge Escape Rooms Limited | Arts & recreation | 2015 |
| Cambridge International Consultancy Ltd | Professional & scientific | 2025 |
| Cambridge Knowledge and AI Hub Limited | Other services | 2026 |
| Cambridge Management Consultancy Ltd | Real estate | 2024 |
| Cambridge Optics Ltd | Wholesale & retail | 2021 |
| Cambridge Property Holdings Limited | Construction | 2002 |
| Cambridge Renewables Limited | Wholesale & retail | 2022 |
| Cambridge Roofworks Limited | Construction | 2025 |
| Cambridge Safety Centre Limited | Public administration | 2024 |
| Cambridge Small Builders Limited | Construction | 2016 |
| Cambridge Tractor Sales Ltd | Wholesale & retail | 2021 |
| Cambridge Urban Development Design Ltd | Professional & scientific | 2009 |
| Cambridge& Newmarket Acupuncture Clinic Limited | Health & social care | 2023 |
| Cambs Developments Limited | Construction | 2018 |
| Cambury Group Ltd | Wholesale & retail | 2025 |
| Camcom Tech Ltd | Information & communication | 1997 |
| Camdram Ltd | Education | 2016 |
| Camelotpm Limited | Households | 2018 |
| Camvil (Developments) Limited | Construction | 1994 |
| Cancun Properties Ltd | Real estate | 2026 |
| Canford Publishing Ltd | Administrative & support | 2014 |
| Cannon Consulting Engineers Limited | Professional & scientific | 2006 |
| Canterview Apartments Management Company Limited | Hospitality | 2005 |
| Canyon Trading (UK) Limited | Extraterritorial | 1990 |
| Capella Systems Limited | Information & communication | 2026 |
| Caps Cases Limited | Manufacturing | 1982 |
| Cara Equine Ltd | Transport & logistics | 2013 |
| Carbrooke Farm Ltd | Agriculture & fishing | 2024 |
| Care Circle Ltd | Health & social care | 2020 |
| Care Consult ID Limited | Professional & scientific | 2022 |
| Care Essential Ltd | Health & social care | 2021 |
| Carene Homes Limited | Construction | 1993 |
| Carenest Staffing Limited | Health & social care | 2025 |
| Cargo Shuttle Ltd | Wholesale & retail | 2025 |
| Carl Stannard Developements Limited | Real estate | 2016 |
| Carolan Utilities Ltd | Construction | 2017 |
| Caropal Homes Limited | Real estate | 2017 |
| Carr Management Consultants Ltd | Professional & scientific | 2019 |
| Carronade Limited | Financial services | 2025 |
| Carry on Packaging Limited | Financial services | 2003 |
| Cars of Cambridge Ltd | Wholesale & retail | 2021 |
| Cartwright Brothers Limited | Construction | 2015 |
| Casom Limited | Professional & scientific | 2024 |
| Catalyst Technology Services Ltd | Information & communication | 2024 |
| Catherine Amendola Design Ltd | Professional & scientific | 2022 |
| Catmj Limited | Extraterritorial | 2012 |
| Catrion Property Management Limited | Real estate | 2000 |
| Catte Latte Ltd | Hospitality | 2024 |
| Cawdle Court Management Limited | Real estate | 2002 |
| CB1 Property Rentals Ltd | Real estate | 2023 |
| CB8 Services Limited | Professional & scientific | 2021 |
| Cbrown Ltd | Wholesale & retail | 2019 |
| CBS (ELY) Ltd | Information & communication | 2003 |
| CCB Aviation Limited | Wholesale & retail | 2006 |
| Ccpubs the Catherine Wheel Ltd | Hospitality | 2024 |
| CD Farming Limited | Agriculture & fishing | 2024 |
| Cdkay Ltd | Wholesale & retail | 2019 |
| CE Properties Limited | Real estate | 2001 |
| Cecile Matthews Consulting Ltd | Professional & scientific | 2010 |
| Celia Marr Veterinary Consultancy Ltd | Professional & scientific | 2024 |
| Celladvice Ltd | Professional & scientific | 2019 |
| Centraserve Ltd. | Information & communication | 1996 |
| Centre Green Limited | Administrative & support | 2007 |
| Centurion Home Improvements (Burwell) Limited | Administrative & support | 2016 |
| Cerakote UK Limited | Wholesale & retail | 2019 |
| Cerching Limited | Professional & scientific | 2012 |
| Certus Shipping Ltd | Transport & logistics | 2025 |
| Cesg Hospitality Ltd | Hospitality | 2024 |
| Cflv Solutions Limited | Professional & scientific | 2025 |
| Cfology Ltd | Professional & scientific | 2025 |
| CG Limited | Extraterritorial | 2008 |
| Ch&N Limited | Wholesale & retail | 2024 |
| Chad Equestrian Ltd | Wholesale & retail | 2020 |
| Challinor Farriery Ltd | Agriculture & fishing | 2025 |
| Champion Developments Limited | Construction | 1965 |
| Chantry Legal Limited | Professional & scientific | 2015 |
| Chapel Court Residents Management Limited | Households | 2024 |