| Bricks and Makers Ltd | Professional & scientific | 2021 |
| Brickweave Limited | Administrative & support | 2020 |
| Bridge House Cambridge Limited | Hospitality | 2022 |
| Bridge House Productions Limited | Information & communication | 2007 |
| Bridge Meadows CIC | Education | 2021 |
| Bright Publishing Limited | Information & communication | 2006 |
| Bright Rope Access Solutions Ltd | Administrative & support | 2024 |
| Brightspur Ltd | Administrative & support | 2014 |
| British Isles Biochar Association Ltd | Other services | 2026 |
| Brockhill Contracts Limited | Agriculture & fishing | 1990 |
| Brockley Homes 6 Ltd | Real estate | 2015 |
| Bronte & Bakery Ltd. | Manufacturing | 2026 |
| Brooks Bros. (London) Limited | Wholesale & retail | 1971 |
| Bropin Ltd | Construction | 2007 |
| Brown&Son Ltd | Construction | 2026 |
| Brunch & Munch Ltd | Hospitality | 2025 |
| BSS North Ltd | Real estate | 2021 |
| BU Ltd | Extraterritorial | 2009 |
| Bubbletec International Limited | Professional & scientific | 2016 |
| Bubbletec Investments Limited | Professional & scientific | 2022 |
| Bubbletec Limited | Professional & scientific | 2011 |
| Buckinghams Catering Supplies Limited | Hospitality | 2002 |
| Buckinghams Food Service Group Limited | Hospitality | 2026 |
| Building Expertise Ltd | Construction | 2015 |
| Bulbeck Foundry Ltd | Manufacturing | 2021 |
| Bulls Bridge Timber Limited | Manufacturing | 2019 |
| Bulse Barns Ltd | Construction | 2020 |
| Bungalow Redhead Ltd | Wholesale & retail | 2021 |
| Burgess Croft Freehold Limited | Professional & scientific | 2014 |
| Burrow & Fern Limited | Manufacturing | 2025 |
| Burstimo Limited | Professional & scientific | 2018 |
| Burtons Living Ltd | Wholesale & retail | 2023 |
| Business & Technology Centre Ltd | Real estate | 2003 |
| Buy Sell UK Homes Ltd | Construction | 2016 |
| C & B Beautiful Limited | Other services | 2009 |
| C & S Environmental Services Limited | Administrative & support | 2005 |
| C Green Electrical Contractors (UK) Limited | Construction | 2018 |
| C J Brooker Ltd | Real estate | 2023 |
| C J Nicholls & SON Ltd | Construction | 2012 |
| C T R Andrews Limited | Construction | 2004 |
| C W LOW and SON Limited | Agriculture & fishing | 2003 |
| C&S Property Developments Ltd | Real estate | 2016 |
| C.J.L Scapes Ltd | Professional & scientific | 2025 |
| C39 Limited | Agriculture & fishing | 2020 |
| Caaxon Limited | Real estate | 2024 |
| Caballo Elite Limited | Wholesale & retail | 2020 |
| Cabin 2 Consultancy Ltd | Professional & scientific | 2026 |
| Cactus Event Management Ltd | Other services | 2018 |
| Cadix (UK) Ltd. | Wholesale & retail | 1999 |
| Cafe Coucou Limited | Hospitality | 2011 |
| Cafe Deja VU Limited | Hospitality | 2019 |
| Caledomus Limited | Administrative & support | 2007 |
| Caliban Ltd | Real estate | 2023 |
| Calibra Technology Ltd | Professional & scientific | 2013 |
| Callisto Property Management Limited | Real estate | 2015 |
| Callum Ilott Promotions Limited | Other services | 2015 |
| Cambridge Agile Solutions Ltd | Information & communication | 2016 |
| Cambridge Artisan Cheese Limited | Wholesale & retail | 2021 |
| Cambridge Bespoke Property Solutions Ltd | Construction | 2014 |
| Cambridge Brickwork Ltd | Construction | 2021 |
| Cambridge Catering Company Limited | Hospitality | 2025 |
| Cambridge City Cricket Club Limited | Arts & recreation | 2020 |
| Cambridge Clinical Consultancy Ltd | Professional & scientific | 2025 |
| Cambridge Events Company Ltd | Administrative & support | 2022 |
| Cambridge Financial Solutions Limited | Professional & scientific | 2009 |
| Cambridge Hampers Limited | Wholesale & retail | 2021 |
| Cambridge Juice Co. Limited | Wholesale & retail | 2002 |
| Cambridge Laparoscopic Ltd | Health & social care | 2013 |
| Cambridge Pharma Services Ltd | Professional & scientific | 2014 |
| Cambridge Property Designer Ltd | Professional & scientific | 2021 |
| Cambridge Saunas Limited | Construction | 2026 |
| Cambridge Vision Technology Ltd | Professional & scientific | 2023 |
| Camcollective Limited | Information & communication | 2010 |
| Camcreatives CIC | Arts & recreation | 2022 |
| Camdenx Ltd | Administrative & support | 2012 |
| Camena Bioscience Limited | Professional & scientific | 2016 |
| Camnet Data Communications Limited | Information & communication | 2007 |
| Camoli Recruitment Ltd | Professional & scientific | 2025 |
| Campmap Limited | Information & communication | 2020 |
| Camscript Limited | Professional & scientific | 2022 |
| Camtive Limited | Information & communication | 2015 |
| Cannon Group Holdings Ltd | Extraterritorial | 2021 |
| Canopy - a Social Imagination Project Ltd | Education | 2017 |
| Caphorn Limited | Professional & scientific | 2015 |
| Capital K Ltd | Professional & scientific | 2012 |
| Capreae Consulting Limited | Professional & scientific | 2023 |
| Carbon C-Questa C.I.C. | Agriculture & fishing | 2020 |
| Care in the Community Ltd | Administrative & support | 2018 |
| Care Queens Company Limited | Administrative & support | 2025 |
| Career Potential Ltd | Professional & scientific | 2019 |
| Carlton Christie Homes Ltd. | Professional & scientific | 1999 |
| Carman Air Conditioning & Heating Limited | Construction | 2007 |
| Carro Trading Limited | Financial services | 2024 |
| Carte Blanche Business Solutions Limited | Professional & scientific | 2010 |
| Carter Estate Co. Limited | Real estate | 1984 |
| Carter Marshall Limited | Administrative & support | 2005 |
| Casa Luxe Directors Limited | Other services | 2026 |
| Casch Investments Ltd | Administrative & support | 2024 |
| Castle Hill (Saffron Walden) Management Co. Limited | Households | 1973 |
| Castle Hill Meats Limited | Manufacturing | 1999 |