| Bushnell PUB Company Ltd | Hospitality | 2012 |
| Business Angel Consulting Ltd | Professional & scientific | 2016 |
| Business Asset & Vehicle Finance Ltd | Financial services | 2007 |
| Business Asset Warranties Ltd | Financial services | 2015 |
| Business Beckinsale Limited | Extraterritorial | 2015 |
| Business Continuity Limited | Administrative & support | 1987 |
| Business Design Solutions Limited | Professional & scientific | 2000 |
| Business Insurance Brokers Ltd | Financial services | 2022 |
| Business Movers Technology Europe Ltd | Administrative & support | 2019 |
| Business Services Bromley (2015) Limited | Administrative & support | 2015 |
| Business Solutions Made Easy Ltd | Information & communication | 2025 |
| Business Taxis Group Limited | Administrative & support | 2017 |
| Business Taxis Limited | Administrative & support | 2017 |
| Businesslink Brokers Ltd | Financial services | 2004 |
| Bustard Consulting Limited | Arts & recreation | 2020 |
| Buster JOE Plumbing and Heat Limited | Construction | 2023 |
| Busy Beaver Limited | Wholesale & retail | 2010 |
| Butlers With Bums Limited | Other services | 2011 |
| Butley Property Services Ltd | Real estate | 2021 |
| Buxted Bonfire Society Limited | Other services | 2018 |
| Buxton James Property and Investments Limited | Real estate | 2020 |
| Buy Celebrity Magazines Ltd | Wholesale & retail | 2007 |
| Buy Tech Better Limited | Information & communication | 2023 |
| Buy the Coast Ltd | Real estate | 2026 |
| Buy the Sea Ltd | Real estate | 2017 |
| Buy to LET Capital Limited | Financial services | 2021 |
| Buy to LET Loans Limited | Financial services | 2021 |
| BUZ Properties Limited | Real estate | 2016 |
| Buzz Brokers Limited | Financial services | 2025 |
| Buzz Capital Finance Limited | Financial services | 2018 |
| Buzz Capital Property Finance Limited | Financial services | 2019 |
| Buzz Capital Services Limited | Administrative & support | 2018 |
| Buzzbo Limited | Information & communication | 2025 |
| BVC Kitchens Ltd | Hospitality | 2025 |
| BW Collective Ltd | Other services | 2022 |
| BWL Associates Limited | Real estate | 2006 |
| BWL Estates Limited | Construction | 2004 |
| BY Firefly Ltd | Manufacturing | 2023 |
| BY Lucy Burns Ltd | Professional & scientific | 2022 |
| BY Nash Ltd | Construction | 2025 |
| BY Stevie Limited | Other services | 2019 |
| Bykofi Ltd | Professional & scientific | 2026 |
| Byrne Consultants Ltd | Extraterritorial | 2024 |
| Byrne Family Foundation | Health & social care | 2010 |
| Byron Bay Strategies Ltd | Information & communication | 2015 |
| BYT (United Kingdom) Limited | | 2010 |
| Bytten Studio Limited | Information & communication | 2019 |
| Bywell Hall Limited | Financial services | 2014 |
| Byzantine Overseas Limited | Real estate | 1995 |
| Béau Amour Aesthetics Ltd | Health & social care | 2025 |
| BÖN Healing Herbs & Retreats Ltd | Agriculture & fishing | 2024 |
| C K Futures Limited | Professional & scientific | 2012 |
| C & C Creative (UK) Limited | Professional & scientific | 2014 |
| C & D Roofing and Property Maintenance Limited | Construction | 2013 |
| C & G Plumbers Limited | Construction | 2020 |
| C & M (Hove) Limited | Real estate | 2001 |
| C & SDS (GB) Ltd | Professional & scientific | 2014 |
| C a Acquisitions Limited | Administrative & support | 2019 |
| C and C Network Installations Ltd | Information & communication | 2017 |
| C Brothers Ltd | Construction | 2026 |
| C DE V Limited | Administrative & support | 2019 |
| C Denyer Limited | Construction | 2014 |
| C E Osborne Ltd | Professional & scientific | 2018 |
| C F Mcewan Ltd | Arts & recreation | 2012 |
| C Gorringe Roofing Ltd | Construction | 2015 |
| C J Sutton Heating and Plumbing Limited | Construction | 2013 |
| C Jesse Limited | Real estate | 2022 |
| C Kennett Construction Limited | Construction | 2015 |
| C Level Earth Limited | Professional & scientific | 2000 |
| C M Print Limited | Manufacturing | 2001 |
| C M Townsend Property UK Limited | Real estate | 2019 |
| C Macleod Ltd | Professional & scientific | 2022 |
| C N Manyokole Limited | Health & social care | 2012 |
| C P Carpentry & Joinery Ltd | Construction | 2013 |
| C P Rolland Ltd | Financial services | 2016 |
| C Squared Events Limited | Professional & scientific | 2025 |
| C W Lifting & Management Limited | Construction | 2023 |
| C W Real Estate Management Limited | Real estate | 2025 |
| C&A Brighton Ltd | Hospitality | 2022 |
| C&S Events Ltd | Other services | 2020 |
| C-Section Reconnection Ltd | Education | 2020 |
| C-Side (Holdings) Limited | Professional & scientific | 2001 |
| C-Side Limited | Wholesale & retail | 1994 |
| C.A.I. Vision Systems Ltd | Wholesale & retail | 2010 |
| C.B. Powell Limited | Real estate | 1946 |
| C.Dugard Limited | Wholesale & retail | 1939 |
| C.O.D. Beers Limited | Wholesale & retail | 1999 |
| C.P. Quiney Limited | Arts & recreation | 2026 |
| C.S. Developments (Sussex) Limited | Construction | 1998 |
| C.T. Electrical & SON Ltd | Construction | 2004 |
| CA DEV Ltd | Professional & scientific | 2014 |
| Cabarave Events Ltd | Arts & recreation | 2026 |
| Cabbit Supreme Ltd | Professional & scientific | 2015 |
| Caburn Capital Limited | Financial services | 2026 |
| Caburn Investments Ltd | Financial services | 2026 |
| Caburn SPV 1 Limited | Extraterritorial | 2026 |
| Caburn SPV 2 Limited | Extraterritorial | 2026 |
| Caburn SPV 3 Limited | Extraterritorial | 2026 |
| Cachet International Limited | Professional & scientific | 1996 |
| CAD Management Limited | Information & communication | 1992 |