| C & H Hotels Limited | Hospitality | 2015 |
| C & R Corporations Ltd | Manufacturing | 2020 |
| C a Powell Builders Limited | Construction | 2015 |
| C and F (Heritage) Limited | Construction | 2024 |
| C B Construction (East Anglia) Limited | Construction | 2008 |
| C Brown & Sons Limited Partnership | | 2025 |
| C H Hunt Limited | Transport & logistics | 2012 |
| C Hamilton Management Ltd | Construction | 2023 |
| C Hobbs Associates Ltd | Construction | 2011 |
| C J Ambler Ltd | Education | 2021 |
| C M Wood Property Limited | Real estate | 2021 |
| C N Business Services Ltd | Information & communication | 2023 |
| C O'Brien Plumbing Ltd | Construction | 2014 |
| C Wallder Consulting Ltd | Financial services | 2026 |
| C&C Carpentry & Installations Ltd | Construction | 2025 |
| C&C Lounge Ltd | Arts & recreation | 2024 |
| C&D Property Portfolio Limited | Real estate | 2019 |
| C&E Lord Limited | Real estate | 2025 |
| C&S Online Ltd | Wholesale & retail | 2023 |
| C&S Travel Ltd | Transport & logistics | 2026 |
| C&V Clothing Limited | Wholesale & retail | 2020 |
| C-Five Ventures Ltd | Financial services | 2026 |
| C-P Services Norfolk Limited | Construction | 2021 |
| C-Suite Assistants UK Ltd | Administrative & support | 2024 |
| C.J. Volkert Haulage Ltd | Transport & logistics | 2008 |
| C.O.L.E Counselling CIC | Health & social care | 2025 |
| C.Olley & Sons,Limited | Manufacturing | 1917 |
| C.S. Moss Services Ltd | Transport & logistics | 2023 |
| C3OENT Ltd | Information & communication | 2025 |
| C5 Depot Limited | Wholesale & retail | 2023 |
| CA Property Services Ltd | Construction | 2026 |
| Cabero Enterprises Ltd | Real estate | 2021 |
| Cabero Properties Ltd | Real estate | 2025 |
| Cable Connect Technical Services Ltd. | Information & communication | 1993 |
| Cabocla Ltd | Wholesale & retail | 2022 |
| Cabs Online Ltd | Transport & logistics | 2026 |
| CAC Signpost Ltd | Wholesale & retail | 2021 |
| Caca&Biru Ltd | Wholesale & retail | 2022 |
| Caceres Limited | Real estate | 2020 |
| Cactus Living Ltd | Real estate | 2018 |
| Cadence Dynamics Ltd | Manufacturing | 2026 |
| Cadento Ltd | Information & communication | 2025 |
| Caelen Bridge Ltd | Extraterritorial | 2025 |
| Caelum Group Limited | Financial services | 2025 |
| CAF International Ltd | Construction | 2026 |
| Cafrica Roasters Ltd | Manufacturing | 2025 |
| Caglar Property Management Ltd | Real estate | 2022 |
| Caidens Chance Ltd | Professional & scientific | 2025 |
| Cainlogic Consulting Ltd | Professional & scientific | 2015 |
| Caje Construction Services Ltd | Construction | 2018 |
| Cake Aide Ltd | Hospitality | 2020 |
| Cala Media & Ecommerce Group Ltd | Administrative & support | 2012 |
| Caladenia Limited | Health & social care | 2026 |
| Calbarrie (Cambridge) Limited | Professional & scientific | 2005 |
| Calby Group Ltd | Wholesale & retail | 2025 |
| Calcon Property Services Limited | Households | 2024 |
| Caldris Ltd | Wholesale & retail | 2026 |
| Calibre Housing Limited | Hospitality | 2025 |
| Calibre Solution Consulting Ltd | Information & communication | 2026 |
| CALL2 Global Ltd | Information & communication | 2024 |
| Called 2 Care Companions Ltd | Health & social care | 2026 |
| Calleva Services Ltd | Professional & scientific | 2025 |
| Callform AI Ltd | Professional & scientific | 2025 |
| Cally Munchy Group Limited | Hospitality | 2022 |
| Calm After 50 Limited | Health & social care | 2025 |
| CALM365 Healthcare Ltd | Public administration | 2022 |
| Calon Home Care Limited | Administrative & support | 2017 |
| Calvin Thomas Solutions Limited | Construction | 2014 |
| CAM Housing Ltd | Construction | 2023 |
| Cambridge & Partners Ltd | Wholesale & retail | 2024 |
| Cambridge Advanced Manufacturing Limited | Manufacturing | 2024 |
| Cambridge Artisan Butchers Ltd | Wholesale & retail | 2024 |
| Cambridge Asbestos Limited | Construction | 2022 |
| Cambridge Asbestos Removal Ltd. | Construction | 2009 |
| Cambridge Care Company Limited | Health & social care | 2008 |
| Cambridge Carpentry Services Ltd | Manufacturing | 2023 |
| Cambridge Centre for Innovation Ltd | Information & communication | 2024 |
| Cambridge Employment Law LLP | | 2010 |
| Cambridge Garden Maintenance Ltd | Administrative & support | 2026 |
| Cambridge Holdings Ltd | Financial services | 2026 |
| Cambridge Land Acquisitions Ltd | Real estate | 2025 |
| Cambridge Life Group Limited | Health & social care | 2014 |
| Cambridge Market Research Holdings Limited | Professional & scientific | 2020 |
| Cambridge Market Research Limited | Professional & scientific | 2001 |
| Cambridge Motorcycle Training Limited | Extraterritorial | 2014 |
| Cambridge MR Limited | Extraterritorial | 2002 |
| Cambridge Pioneering Innovations Limited | Wholesale & retail | 2025 |
| Cambridge Smart Solution Ltd | Information & communication | 2024 |
| Cambridge Vascular Services Ltd | Health & social care | 2019 |
| Camden Passage Development Company Limited | Real estate | 1962 |
| Camden Passage Sites Limited | Real estate | 1960 |
| Camebridge Commercial Solutions Limited | Professional & scientific | 2020 |
| Camera Technology Solutions Ltd | Manufacturing | 2011 |
| Cameron BID & Framework Consulting Ltd | Professional & scientific | 2026 |
| Cameron Design & Marketing Limited | Professional & scientific | 2004 |
| Campaign Ninjas Ltd | Information & communication | 2023 |
| Campbell Street Limited | Other services | 2022 |
| Campfires & Sleepovers Limited | Administrative & support | 2023 |
| Camping for ALL Ltd | Administrative & support | 2025 |
| Camsparks Limited | Manufacturing | 2017 |