| Bush & Co (Cambridge) Ltd | Real estate | 2002 |
| Bush and Co Property Management Limited | Households | 1998 |
| Bush Developments (Cambridge) Limited | Real estate | 1996 |
| Bush Trading Limited | Real estate | 2013 |
| Bushcharm Limited | Real estate | 1987 |
| Business and Life Boost Ltd | Professional & scientific | 2018 |
| Business Aviation Training Solutions Limited | Transport & logistics | 2022 |
| Business by Mari Ltd | Professional & scientific | 2021 |
| Business Drive Limited | Transport & logistics | 2024 |
| Business Partners Financial & Management Services Limited | Professional & scientific | 2013 |
| Business Scope Limited | Professional & scientific | 1991 |
| Business Software Group Limited | Information & communication | 1994 |
| Business Supermarket Limited | Professional & scientific | 2022 |
| Businessmate Ltd | Extraterritorial | 2022 |
| Businotech Limited | Professional & scientific | 2013 |
| Busola Jegede International Ministry | Other services | 2016 |
| Busy Beads Limited | Wholesale & retail | 2024 |
| Busy Bees Removals Ltd | Transport & logistics | 2026 |
| Butler AI Limited | Information & communication | 2026 |
| Butler Bros Ltd | Construction | 2013 |
| Butter Adasi Health International Trading Co., Ltd | Manufacturing | 2024 |
| Buttercups Childcare Ltd | Health & social care | 2016 |
| Butterfield Park Management Limited | Real estate | 2007 |
| Button Investments Limited | Financial services | 2026 |
| Button Property Developments Limited | Financial services | 2026 |
| Buyber Ltd | Wholesale & retail | 2025 |
| Buyerboard Limited | Wholesale & retail | 2026 |
| Buying Agent Partnership Limited | Real estate | 2015 |
| Buyinuo (Zhejiang) Import and Export Co., Ltd | Wholesale & retail | 2024 |
| Buylet Group Ltd | Construction | 2021 |
| BV Sky Ltd | Manufacturing | 2026 |
| Bvgmav Ltd | Extraterritorial | 2019 |
| BVP Residential Management Company Limited | Households | 2017 |
| BVT Consulting Limited | Professional & scientific | 2018 |
| BVT Holdings Limited | Financial services | 2026 |
| BW Chemical Limited | Wholesale & retail | 2026 |
| BWD Carpentry Limited | Construction | 2012 |
| BX Auto Trading Co., Ltd | Wholesale & retail | 2023 |
| Bxmex Limited | Extraterritorial | 2020 |
| BY Design (Cambridge) Ltd | Wholesale & retail | 2003 |
| BY Jenna Limited | Administrative & support | 2024 |
| BY Second Bloom Limited | Wholesale & retail | 2025 |
| BY the People Ltd | Wholesale & retail | 2021 |
| BY Victoria Beauty Ltd | Other services | 2026 |
| Byron and Associates Ltd. | Arts & recreation | 2019 |
| Byron Bros Ltd | Professional & scientific | 2021 |
| Byron House (Wellington Street) Limited | Real estate | 2011 |
| Byron House Management Company Limited | Administrative & support | 2004 |
| Bytedeploy LLP | | 2026 |
| Byton Haulage Ltd | Transport & logistics | 2025 |
| C & D Properties (Cambridge) Limited | Real estate | 2018 |
| C & I Associates Limited | Professional & scientific | 2014 |
| C & O Direct Ltd | Wholesale & retail | 2019 |
| C & SON Flooring Ltd | Construction | 2023 |
| C & W Events Limited | Hospitality | 2019 |
| C 3 Limited | Professional & scientific | 1997 |
| C a Dyer Accounts & Bookkeeping Ltd | Professional & scientific | 2022 |
| C and C Investments and Management Limited | Real estate | 2026 |
| C and S Twist LLP | | 2003 |
| C Artium Limited | Arts & recreation | 2019 |
| C Arts International Limited | Arts & recreation | 2021 |
| C Biologics Holdco Limited | Professional & scientific | 2024 |
| C Biologics Newco Limited | Professional & scientific | 2024 |
| C Chambers Ltd | Professional & scientific | 2019 |
| C Events Limited | Arts & recreation | 2021 |
| C Film Limited | Arts & recreation | 2005 |
| C G Carter Construction Ltd | Construction | 2023 |
| C G Harper Ltd | Agriculture & fishing | 2016 |
| C H Management (Cambridge) Limited | Households | 2005 |
| C International Limited | Arts & recreation | 2021 |
| C J Lilley Ltd | Real estate | 2003 |
| C J Tennis Coaching Ltd | Arts & recreation | 2015 |
| C M Bricklaying & Building Services Ltd | Construction | 2022 |
| C P Tiling Services Ltd | Administrative & support | 2017 |
| C P Waterson Ltd | Hospitality | 2019 |
| C S Barker Building Contractors Limited | Construction | 2004 |
| C S Construction & Development Ltd. | Construction | 2022 |
| C S Martin (Decorators) Ltd | Construction | 2005 |
| C Silverman Office Furniture Centre Limited | Wholesale & retail | 2023 |
| C Smiley Group Limited | Extraterritorial | 2013 |
| C T Innovations Limited | Information & communication | 2007 |
| C Theatre Limited | Arts & recreation | 2004 |
| C U Consulting Limited | Professional & scientific | 2006 |
| C U R U F C Sports & Social Limited | Hospitality | 1998 |
| C U R U F C Trading Limited | Arts & recreation | 1998 |
| C W Kirk Lawnmowers Limited | Manufacturing | 2011 |
| C Webb Planning Limited | Professional & scientific | 2024 |
| C&A Consultancy Limited | Health & social care | 2024 |
| C&A Londonconstruction Ltd | Construction | 2026 |
| C&C Noodle Bar Limited | Hospitality | 2018 |
| C&K Plumbing&Bathrooms. Ltd | Construction | 2023 |
| C&P Investments Cambridge Ltd | Real estate | 2019 |
| C&R Wise AI Limited | Information & communication | 2020 |
| C&Y Sanitary Ware Co., Ltd | Extraterritorial | 2018 |
| C-130 Total Maintenance Ltd | Manufacturing | 2025 |
| C-Eco Roofing Ltd | Construction | 2013 |
| C. R. Barnes Limited | Information & communication | 2000 |
| C.A.C. (Holdings) Limited | Real estate | 1974 |
| C.A.M Property Services Limited | Construction | 2009 |
| C.C.M. Titan Haulage Ltd | Transport & logistics | 2025 |