| Benzo Holding Co Limited | Wholesale & retail | 2017 |
| Bercelan Limited | Hospitality | 2014 |
| Berea House Management Co. Limited | Households | 1991 |
| Beresford Plumbing & Heating Limited | Construction | 2016 |
| Beritan Cafe Ltd | Hospitality | 2019 |
| Berkeley Capital Investment Limited | Professional & scientific | 1997 |
| Berkeley Consultancy Ltd | Financial services | 2021 |
| Berkeley Court (Brighton) Limited | Households | 1997 |
| Beroean School of Thought Ltd | Extraterritorial | 2017 |
| Berry & Minall Limited | Construction | 2015 |
| Berst Limited | Information & communication | 2018 |
| Bert's Homestores Ltd | Wholesale & retail | 2003 |
| Bertram Scaffolding Ltd | Construction | 2018 |
| Besaucy Ltd | Manufacturing | 2019 |
| Beshara Brighton Properties Ltd | Real estate | 2024 |
| Bespoke Agile Delivery and Support Services Limited | Professional & scientific | 2007 |
| Bespoke Built Ltd | Construction | 2024 |
| Bespoke J Limited | Construction | 2021 |
| Bespoke Kitchens Limited | Wholesale & retail | 2007 |
| Bespoke Labels Ltd | Extraterritorial | 2020 |
| Bespoke Menu Design Limited | Hospitality | 2005 |
| Bespoke Records Ltd | Information & communication | 2014 |
| Bessingham Limited | Real estate | 1999 |
| Best Before BTN Ltd | Administrative & support | 2025 |
| Best Insurance Ltd | Financial services | 2004 |
| Best of British Events Limited | Other services | 2018 |
| Best Risk Management and Financial Service Limited | Financial services | 2009 |
| Best Venues Group Ltd | Real estate | 2023 |
| BEST4HEADSETS Limited | Professional & scientific | 2006 |
| BEST4IP Ltd | Extraterritorial | 2008 |
| BEST4SAFETY Ltd | Professional & scientific | 2019 |
| BEST4SYSTEMS Limited | Professional & scientific | 2004 |
| Besttool Limited | Wholesale & retail | 2025 |
| Bethany Fosbery Ltd | Professional & scientific | 2022 |
| Betsy's Ltd | Real estate | 2025 |
| BETTDAVID20 Limited | Construction | 2025 |
| Better Bids Ltd | Administrative & support | 2019 |
| Better Capital Limited | Hospitality | 2025 |
| Better Environment and Transport (Beat) Ltd. | Information & communication | 2022 |
| Betts Vehicle Solutions Limited | Wholesale & retail | 2021 |
| Bettsfinance Limited | Professional & scientific | 2012 |
| Betty & the Brands Ltd | Wholesale & retail | 2024 |
| Between Two Thorns Ltd | Wholesale & retail | 2018 |
| Between Waves Ltd | Professional & scientific | 2025 |
| Beven Property Management Limited | Real estate | 2010 |
| Bevendean Water Ltd. | Manufacturing | 2013 |
| Bevernbridge Farm Limited | Agriculture & fishing | 2018 |
| Bevernbridge Stables Limited | Agriculture & fishing | 2007 |
| Bexheat Ltd | Construction | 2014 |
| Beyond & Co Global Limited | Professional & scientific | 2025 |
| Beyond Batteries Ltd | Construction | 2010 |
| Beyond Boundaries Strategy Ltd | Professional & scientific | 2024 |
| Beyond GM Limited | Professional & scientific | 2014 |
| Beyond Legal Ltd | Professional & scientific | 2024 |
| Beyond the Book Festival Ltd | Hospitality | 2024 |
| Beyond the Pixels Ltd | Information & communication | 2013 |
| Beyond the Sidelines Careers Ltd | Professional & scientific | 2025 |
| BF Residential Ltd | Real estate | 2022 |
| BFA Electrical Contractors Limited | Construction | 2008 |
| BG Finishings Ltd | Construction | 2011 |
| Bgbw Ltd | Hospitality | 2026 |
| BGL Direct Life Limited | Extraterritorial | 2011 |
| BH22 Limited | Hospitality | 2022 |
| BHA Cards Limited | Wholesale & retail | 2025 |
| Bhagwan Company Ltd | Health & social care | 2017 |
| Bharking Designs Ltd | Professional & scientific | 2024 |
| Bhcc Ltd | Administrative & support | 2007 |
| BHF Checkpoint Ltd | Manufacturing | 2026 |
| Bhmp Ltd | Hospitality | 2023 |
| BIA Creative Ltd | Arts & recreation | 2021 |
| Biba Building Contractors Limited | Construction | 2014 |
| Bible-In-Life Church Resources Limited | Information & communication | 1991 |
| Bibotan Ltd | Other services | 2012 |
| Bickerstaff Fishing Company Limited | Agriculture & fishing | 2003 |
| BID ME App Ltd | Information & communication | 2019 |
| Bidwell Professional Hairstylist Limited | Other services | 2011 |
| Bidwells Plumbing Heating & GAS Services Ltd | Construction | 2023 |
| Bifound Ltd | Information & communication | 2017 |
| Big BAD Media Ltd | Professional & scientific | 2020 |
| Big Banking Limited | Construction | 2016 |
| Big Bear Little Goose Ltd | Information & communication | 2012 |
| Big Beat Brighton Ltd | Information & communication | 2021 |
| Big Bright Ltd. | Arts & recreation | 2012 |
| Big Desk Brighton Ltd | Professional & scientific | 2023 |
| Big Fish Brighton Ltd | Hospitality | 2024 |
| Big Fish Marketing Ltd | Information & communication | 2025 |
| Big HUG Brewing Limited | Administrative & support | 2014 |
| Big in Japan Ltd | Real estate | 2018 |
| Big Joanie Ltd | Information & communication | 2022 |
| Big League Onscreen Xperience Ltd | Information & communication | 2026 |
| Big MAN Films Ltd | Information & communication | 2011 |
| Big MAN Limited | Professional & scientific | 2010 |
| Big Mikan Ltd. | Wholesale & retail | 2023 |
| Big Nature Limited | Arts & recreation | 2014 |
| Big Sky Adventures Limited | Professional & scientific | 2023 |
| Big Student House Ltd | Real estate | 2020 |
| Big Wave (CAN Dogs Talk) Limited | Information & communication | 2024 |
| Big Wave Productions Limited | Information & communication | 1995 |
| Bigface Productions Ltd | Arts & recreation | 2008 |
| Bigfoot PUB Co Ltd | Hospitality | 2016 |