| Britten People Ltd | Professional & scientific | 2008 |
| Broadcast Insurance Brokers Ltd | Financial services | 2023 |
| Bromor EMS Limited | Administrative & support | 2016 |
| Brookes House Ltd | Real estate | 2023 |
| Brothers Lets Limited | Real estate | 2024 |
| Brownie Babe Ltd | Manufacturing | 2020 |
| Browns Storage & Removals Limited | Transport & logistics | 2017 |
| Bryluen Botanicals Ltd | Wholesale & retail | 2024 |
| Brymanor Limited | Real estate | 1987 |
| BS Members Club Limited | Other services | 2021 |
| BSL Enterprises Limited | Real estate | 2000 |
| BTS Property Group Ltd | Construction | 2025 |
| BTS Roofing Limited | Construction | 2024 |
| Buckley's Accounting Services Ltd | Professional & scientific | 2025 |
| Build Fresh Construction Services Ltd | Construction | 2022 |
| Building Control Consultants Ltd | Professional & scientific | 2018 |
| Bull Lane Properties Limited | Construction | 2017 |
| Bull Lane Villa's Limited | Real estate | 2016 |
| Burgess & Walker Transport Limited | Agriculture & fishing | 1965 |
| Burliegh Hill Farm Limited | Hospitality | 2000 |
| Burton Property and Development Limited | Real estate | 2017 |
| Burton Residential Limited | Real estate | 2022 |
| Burton Surveying Ltd | Construction | 2011 |
| Bushfield Property Management Limited | Construction | 2016 |
| Buttriss Properties Ltd | Real estate | 2024 |
| Buy Property Ltd | Real estate | 2019 |
| Bx.Plans Limited | Manufacturing | 2015 |
| BY the Beagle Ltd | Wholesale & retail | 2025 |
| Bymyself Limited | Administrative & support | 2021 |
| C & J Haycock Limited | Extraterritorial | 1957 |
| C a Automation Limited | Manufacturing | 2016 |
| C Smith Housing Consultancy Ltd | Professional & scientific | 2021 |
| C&C Construction March Limited | Construction | 2017 |
| C.A.N. Community Action Network | Health & social care | 1995 |
| Cafinos Ltd | Professional & scientific | 2022 |
| Cain Medical Limited | Information & communication | 2005 |
| Cakepub Ltd | Manufacturing | 2025 |
| Callisto Electronic Systems Ltd | Information & communication | 2016 |
| CAM Clinics Limited | Health & social care | 2014 |
| Cambridge & Norfolk DRY Wall Limited | Construction | 2016 |
| Cambridge Coaches Limited | Administrative & support | 2017 |
| Cambridge Computer Consultants Limited | Information & communication | 2009 |
| Cambridge Crane Hire Ltd | Construction | 2015 |
| Cambridge Education Partnership Ltd | Administrative & support | 2016 |
| Cambridge Filmworks Ltd | Administrative & support | 2011 |
| Cambridge Filmworks TM Ltd | Administrative & support | 2022 |
| Cambridge Geopolitical Risk Consultants Ltd | Professional & scientific | 2026 |
| Cambridge Hearing Limited | Health & social care | 2019 |
| Cambridge Imports Limited | Real estate | 2023 |
| Cambridge Investment Consultants Limited | Financial services | 2016 |
| Cambridge Lambretta Limited | Wholesale & retail | 2008 |
| Cambridge Marina Limited | Hospitality | 2016 |
| Cambridge Multimedia Group Limited | Real estate | 1991 |
| Cambridge Nurseries Ltd | Health & social care | 2022 |
| Cambridge Powered Access Ltd | Professional & scientific | 2024 |
| Cambridge Realty Limited | Real estate | 2015 |
| Cambridge Regulatory Services Ltd | Professional & scientific | 1999 |
| Cambridge Resources Ltd | Professional & scientific | 2019 |
| Cambridge Sensotec Limited | Manufacturing | 2000 |
| Cambridge Stamp Centre Limited(The) | Wholesale & retail | 1976 |
| Cambridge Transformers Limited | Financial services | 2007 |
| Cambridgeshire Photobooths Ltd | Extraterritorial | 2025 |
| Cambs Care Limited | Health & social care | 2023 |
| Cambs Electrical Contractors Ltd | Construction | 2021 |
| Cambs. IT Services Ltd | Information & communication | 2024 |
| Cambschauffeurs Ltd | Transport & logistics | 2023 |
| Camel Construction Specialists Ltd | Construction | 2025 |
| Cameo Print and Displays Limited | Manufacturing | 2019 |
| Cameron Bosque Brookes Architects Limited | Professional & scientific | 2020 |
| Cameron James Archive Limited | Wholesale & retail | 2021 |
| Camile Homes Limited | Real estate | 2025 |
| Camtech Property Services Limited | Real estate | 2023 |
| Canning Qualification & Assessment Consultancy Limited | Professional & scientific | 2026 |
| CAP Air Property Limited | Real estate | 2017 |
| CAP Training Limited | Education | 2014 |
| Capital & Highland Investments Limited | Wholesale & retail | 2009 |
| Capital Futures Holdings Limited | Other services | 2024 |
| Capital Value Surveyors Holding Limited | Financial services | 2022 |
| Caporaso Properties (ST Ives) Limited | Real estate | 2022 |
| Carakizz Limited | Information & communication | 2014 |
| Carbis Water Parking Limited | Extraterritorial | 2008 |
| Caring Together Charity | Health & social care | 2002 |
| Carl Potter Wilson Ltd | Construction | 2026 |
| Carlton Apartments (ST Ives) Limited | Extraterritorial | 2015 |
| Carol Darnell Limited | Administrative & support | 2011 |
| Carriage Mews (ST. Ives) Management Limited | Real estate | 2009 |
| Carrick Business Solutions Limited | Professional & scientific | 2013 |
| Carters Commercials Limited | Wholesale & retail | 2015 |
| Casa Studio Limited | Professional & scientific | 2012 |
| Casp | Professional & scientific | 1988 |
| Castlehythe Limited | Wholesale & retail | 2014 |
| Castlesecure Ltd | Administrative & support | 2018 |
| Castrum Homes and Consultants Ltd | Professional & scientific | 2023 |
| Catering Equipment Services (Peterborough) Ltd | Professional & scientific | 2014 |
| Catering-Van Conversions Limited | Manufacturing | 2016 |
| Cattco Ltd | Real estate | 2006 |
| Cattran Developments Limited | Construction | 2013 |
| CAZ Limited | Information & communication | 1997 |
| CB Broadcast Limited | Information & communication | 1995 |
| CB Developments (SW) Limited | Construction | 2021 |