| Catechumen Limited | Professional & scientific | 2023 |
| Categorical Imperative Consulting Services Limited | Information & communication | 2014 |
| Catena.Ai Ltd | Information & communication | 2024 |
| Catenary Solutions Limited | Professional & scientific | 2015 |
| Caterplan Services LLP | | 2009 |
| Cath Conlon Project Management Limited | Professional & scientific | 2010 |
| Cathedral View (Phase 2) ELY Management Company Limited | Households | 2005 |
| Catherine Court Management Company (Trumpington) Limited | Households | 2012 |
| Catherine Hall Consulting Limited | Professional & scientific | 2010 |
| Catherine Tilley Associates Ltd | Professional & scientific | 2016 |
| Catherine Tramontan Ltd | Professional & scientific | 2022 |
| Cats Colleges Holdings Limited | Financial services | 2019 |
| Cats Retail Limited | Education | 2007 |
| Cats Step Limited | Information & communication | 2021 |
| Caux Limited | Professional & scientific | 2025 |
| Cavaleri Developments Limited | Construction | 2024 |
| Cavaleri Partnership Limited | Professional & scientific | 2006 |
| Cave Property Management (Cambridge) Ltd | Households | 2014 |
| Cave Property Management Limited | Real estate | 2021 |
| Cavendish Sustainability Ltd | Professional & scientific | 2021 |
| Cavernlodge Limited | Real estate | 1991 |
| Cavill Robinson Financial Recruitment Limited | Administrative & support | 2003 |
| Cavoo Home Improvement Ltd | Wholesale & retail | 2024 |
| Caxton Investors Ltd | Hospitality | 2012 |
| Caye&Da Ltd | Health & social care | 2016 |
| Cayenne Consulting Limited | Administrative & support | 2006 |
| Cayenne Court Management Company Limited | Households | 1999 |
| CB Auto Tuning Limited | Wholesale & retail | 2026 |
| CB Counselling Limited | Extraterritorial | 2020 |
| CB Towers Limited | Real estate | 2019 |
| CB1 Apartments Limited | Hospitality | 2012 |
| CB1 Central Build Ltd | Construction | 2021 |
| CB1 Electrical Limited | Construction | 2018 |
| CB1 Group Ltd | Construction | 2025 |
| CB1 Hardware Ltd | Wholesale & retail | 2026 |
| CB1 Ltd | Wholesale & retail | 1995 |
| CB1 Management Company Limited | Households | 2010 |
| CB1 Plumbing & Heating Ltd | Construction | 2018 |
| CB1 Properties Cambridge Limited | Real estate | 2018 |
| CB1 Property Services Ltd | Construction | 2018 |
| CB1 Services Limited | Construction | 1986 |
| CB1X Holdings Limited | Financial services | 2024 |
| CB2 Driving Academy Ltd | Education | 2023 |
| CB23 Ltd | Construction | 2021 |
| CB25 Accounting Limited | Professional & scientific | 2017 |
| CB3 Consulting Ltd | Professional & scientific | 2020 |
| CB3 Properties Ltd | Households | 2025 |
| CB32 Legal Ltd | Administrative & support | 2024 |
| CB4 Autos Limited | Wholesale & retail | 2024 |
| CB4 Construction Management Ltd | Construction | 2025 |
| CB4 IC Design Limited | Professional & scientific | 2025 |
| CB4 Ltd | Construction | 2024 |
| CB4 Management Company Limited | Households | 2018 |
| CB4LIVING LLP | | 2015 |
| CBE Electrical Ltd | Construction | 2025 |
| Cbjh Developments Limited | Construction | 2026 |
| Cbjh Limited | Construction | 2014 |
| Cblu Property Solutions Limited | Real estate | 2021 |
| Cbprodecs Ltd | Construction | 2022 |
| CBS Cambridge Ltd | Other services | 2011 |
| CBS Office Solutions Limited | Wholesale & retail | 1999 |
| CBS Office Supplies Limited | Wholesale & retail | 2006 |
| CBT & Neuropsychology Centre Ltd | Administrative & support | 2013 |
| CBX Consulting Ltd | Professional & scientific | 2024 |
| CBX Technologies Limited | Information & communication | 2024 |
| CC Biotech Ltd. | Professional & scientific | 2018 |
| CC Dynamic Solutions Ltd | Professional & scientific | 2024 |
| Cc.Tech Engineering Solutions Limited | Professional & scientific | 2024 |
| CCB Electrical Ltd | Construction | 2023 |
| CCB Engineering Ltd | Construction | 2023 |
| CCI Services Limited | Administrative & support | 2015 |
| CCM Ventures Ltd | Administrative & support | 2021 |
| CCP Management LLP | | 2016 |
| CCS (Cambridge) Ltd | Manufacturing | 2012 |
| Cdhj (UK) Limited | Administrative & support | 2024 |
| CDJ Driver Services Ltd | Transport & logistics | 2013 |
| CDL Property Maintenance Ltd | Administrative & support | 2025 |
| CDM Bridge Limited | Professional & scientific | 2010 |
| Cdoc Ltd. | Manufacturing | 2003 |
| CDP Employee Trustee Limited | Extraterritorial | 2018 |
| CDP Group UK Ltd | Professional & scientific | 2026 |
| CDP Learning Limited | Education | 2017 |
| Cdts South and East Ltd | Administrative & support | 2020 |
| CE Cook Consulting Ltd | Professional & scientific | 2019 |
| Ceapach Ltd | Manufacturing | 2025 |
| Cecchetti 23 Ltd | Manufacturing | 2023 |
| Cecil Lodge Property Management Limited | Real estate | 2007 |
| Cecile Park Property Management Ltd | Real estate | 2022 |
| Cecilia Apartments Management Company Limited | Households | 2004 |
| Cecilia's Flowers Limited | Wholesale & retail | 2018 |
| Cedar Audio EOT Limited | Professional & scientific | 2025 |
| Cedar Audio Limited | Manufacturing | 1993 |
| Cedar Court (Cambridge) Limited | Real estate | 1960 |
| Cedar Court (Soham) Management Company Limited | Households | 1988 |
| Cedar Court(Maidenhead)Residents Association Limited | Households | 1965 |
| Cedar House Consultants Limited | Professional & scientific | 2025 |
| Cedar Management and Property Limited | Real estate | 2023 |
| Cedars Park RTM Company Limited | Households | 2004 |
| Cedarview Investment Limited | Professional & scientific | 2020 |
| CEG Administrative Services Limited | Education | 2007 |