| CEG Colleges Limited | Financial services | 2007 |
| CEG Digital Limited | Professional & scientific | 2016 |
| CEG DRY Cleaners Ltd | Administrative & support | 2025 |
| CEG Global Online SB Limited | Education | 2022 |
| CEG International Limited | Other services | 2018 |
| CEG Oncampus Holdings Limited | Financial services | 2019 |
| CEG Online Limited | Education | 2016 |
| CEG Properties Limited | Real estate | 1989 |
| CEG UFP Limited | Professional & scientific | 2007 |
| CEG UNW Online Limited | Education | 2021 |
| Celentano Group Ltd | Financial services | 2013 |
| Celeritas Limited | Manufacturing | 2018 |
| Celest Elite UK Limited | Manufacturing | 2025 |
| Celestia BIO Ltd | Professional & scientific | 2024 |
| Celestia Global Corporation Ltd | Manufacturing | 2024 |
| Celestium Labs Ltd | Information & communication | 2025 |
| Cell Culture Automation Ltd | Professional & scientific | 2023 |
| Cell Guidance Systems Limited | Professional & scientific | 2010 |
| Cellcentric Limited | Professional & scientific | 2003 |
| Cellcodex Technology Limited | Professional & scientific | 2025 |
| Cellcountr CIC | Information & communication | 2013 |
| Cellestial Health Ltd | Professional & scientific | 2023 |
| Cellini Capital Limited | Financial services | 2019 |
| Cellionix Ltd | Manufacturing | 2025 |
| Cellrx Limited | Professional & scientific | 2020 |
| Cellskan Limited | Professional & scientific | 2023 |
| Celltranslation Limited | Professional & scientific | 2025 |
| Cellular Highways Limited | Professional & scientific | 2018 |
| Cellxica Limited | Information & communication | 2014 |
| Celoda Limited | Professional & scientific | 2024 |
| Celtic House Cambridge (Management) Limited | Households | 1986 |
| Celticire Ltd | Other services | 2025 |
| Cenentry Biosciences Limited | Professional & scientific | 2021 |
| Cenobots UK Limited | Manufacturing | 2026 |
| Centaur Consulting Group Ltd | Professional & scientific | 2006 |
| Centaur Gravity Group Ltd | Information & communication | 2020 |
| Centaur Venture Capital Group Ltd | Financial services | 2020 |
| Centauri Composites Ltd | Manufacturing | 2025 |
| Center for Dynamic Causality CIC | Information & communication | 2026 |
| Center for Information and Study on Clinical Research Participation Ltd | Health & social care | 2021 |
| Central European Business Limited | Professional & scientific | 1992 |
| Central Management (UK) Limited | Extraterritorial | 1995 |
| Central Square (District Centre) Management Company Limited | Households | 2015 |
| Centraltarget Property Management Limited | Real estate | 1989 |
| Centre for Alternative Dispute Resolution Experts (Cadre) Limited | Other services | 2022 |
| Centre for Business Innovation Limited | Other services | 2009 |
| Centre for Events and Festivals Community Interest Company | Professional & scientific | 2025 |
| Centre for Planetary Health Ltd | Professional & scientific | 2022 |
| Centre of Hope | Administrative & support | 2003 |
| Centurian Security Services Limited | Administrative & support | 2025 |
| Centurion Student Services (UK) Ltd | Real estate | 2014 |
| Century Chemical Ltd | Wholesale & retail | 2022 |
| Century Close Cambridge Management Company Limited | Real estate | 2009 |
| Century Security Services Limited | Administrative & support | 2021 |
| Cenusa Engineering Ltd | Manufacturing | 2026 |
| CEO CF Ltd | Other services | 2022 |
| Cep-Ip Ltd | Professional & scientific | 2015 |
| Cepef CIC | Professional & scientific | 2024 |
| Ceramic Insight Ltd | Manufacturing | 2024 |
| Cerc Overseas Ltd | Professional & scientific | 2008 |
| Ceres Cambridge Management Company Limited | Households | 2012 |
| Ceres Investments Limited | Real estate | 2018 |
| Ceres Machinery Limited | Wholesale & retail | 2021 |
| Ceres Rise Residents Management Company Limited | Households | 2021 |
| Cerevance, Ltd | Professional & scientific | 2016 |
| Cerise Education Consulting Limited | Professional & scientific | 2020 |
| Ceroc Evoke Limited | Education | 2018 |
| Ceroc Spirit Ltd | Education | 2018 |
| Certitudo AI Limited | Information & communication | 2026 |
| Cerulean Therapeutics Limited | Professional & scientific | 2025 |
| Cesamè Interiors Ltd | Wholesale & retail | 2024 |
| Cesar International Ltd | Financial services | 2026 |
| Cesar Lastra Labs Ltd | Professional & scientific | 2026 |
| Ceso Solutions Ltd | Construction | 2016 |
| Cesyg Ltd | Manufacturing | 2019 |
| Cetangtang Ltd | Information & communication | 2024 |
| Ceylon Graphite Technologies Ltd | Professional & scientific | 2021 |
| Ceylonamon Ltd | Wholesale & retail | 2024 |
| CFC Management Services Limited | Hospitality | 2023 |
| Cfit Consulting Limited | Professional & scientific | 2022 |
| CFO Team Limited | Professional & scientific | 2020 |
| CFO4TECH Limited | Professional & scientific | 2012 |
| Cfoplus Ltd | Professional & scientific | 2025 |
| CG Cambridge Ltd | Administrative & support | 2024 |
| CG Chambers and Sons Limited | Agriculture & fishing | 2017 |
| CG Swim School Ltd | Arts & recreation | 2018 |
| CG Valve Co., Ltd | Manufacturing | 2024 |
| CGI Pros Ltd | Professional & scientific | 2018 |
| CGN Global Uranium Limited | Wholesale & retail | 2014 |
| Cgnl Associates Ltd | Professional & scientific | 2023 |
| Cgnm UK Ltd. | Other services | 2015 |
| Cgo.Bio Limited | Professional & scientific | 2025 |
| CGS Administrative Services Limited | Professional & scientific | 2020 |
| CGS UK Holdings Limited | Financial services | 2024 |
| Cgss Ltd | Transport & logistics | 2017 |
| CH Adventure Ltd | Financial services | 2023 |
| CH6 Holdings Limited | Financial services | 2026 |
| CH6 Investments Limited | Real estate | 2026 |
| Chabad Lubavitch of Cambridge | Education | 2015 |
| Chadacre Hill Properties Limited | Real estate | 2007 |