| Bamboo Nine Group Ltd | Financial services | 2020 |
| Bamboo Nine Media Ltd | Professional & scientific | 2014 |
| Bamfordian Properties Limited | Real estate | 1972 |
| Bamfy Limited | Wholesale & retail | 2026 |
| Bamo 1 Barber Ltd | Other services | 2024 |
| Bamo Barber Ltd | Other services | 2020 |
| Bam’S Kitchen Ltd | Hospitality | 2022 |
| Banannsborough Park Ltd | Hospitality | 2024 |
| Bandar Group Ltd | Real estate | 2025 |
| Bandar TEC Consulting Limited | Professional & scientific | 2021 |
| Bandstand Associates Ltd | Administrative & support | 2022 |
| Bandstand Brighton Ltd | Hospitality | 2015 |
| Bandstand Cafe Bistro Ltd | Hospitality | 2024 |
| Bandstand Construction Ltd | Construction | 2021 |
| Bang & Olufsen CI Limited | Information & communication | 2018 |
| Bang Bang Games Limited | Information & communication | 2020 |
| Bang Tidy Cleaning Services Limited | Administrative & support | 2016 |
| Bang Tidy Property Management Services Limited | Other services | 2015 |
| Bangbao Ltd | Hospitality | 2020 |
| Bani & Co UK Ltd | Wholesale & retail | 2025 |
| Bani Sourcing Ltd. | Administrative & support | 2023 |
| Bankruptcy Annuity Services LLP | | 2007 |
| Banks Wilson Lettings & Property Management Limited | Real estate | 2024 |
| Bankside Law Limited | Extraterritorial | 2001 |
| Bannow Retirement Home Limited | Health & social care | 2008 |
| Banonymous Ltd | Other services | 2020 |
| Banxe Ltd | Information & communication | 2019 |
| Baobao (Brighton) Ltd | Wholesale & retail | 2026 |
| Baqueano Ltd | Hospitality | 2019 |
| Bar Broadway (2023) Ltd | Hospitality | 2023 |
| Bar Broadway Ltd | Hospitality | 2014 |
| Bar Luciano Ltd | Hospitality | 2019 |
| Bar People Brighton Ltd | Hospitality | 2015 |
| Bar'Va Limited | Hospitality | 2016 |
| Barbara Davies Limited | Arts & recreation | 2006 |
| Barbary Lane Limited | Wholesale & retail | 2016 |
| Barber and Frank Kemp Town Limited | Other services | 2019 |
| Barber KIN NR3 Ltd | Other services | 2023 |
| Barberd Limited | Financial services | 2024 |
| Barbod Consulting & Forwarding Ltd | Transport & logistics | 2024 |
| Barbrook Green Limited | Real estate | 2006 |
| Barbury Partners LLP | | 2021 |
| Barcombe News Limited | Wholesale & retail | 2008 |
| Bardsleys Fish Bar Limited | Hospitality | 2023 |
| Bare Biology Ltd | Wholesale & retail | 2012 |
| Barefaced Limited | Manufacturing | 2009 |
| Barefoot Design Limited | Professional & scientific | 2024 |
| Barfields Butchers Ltd | Wholesale & retail | 2012 |
| Baria Ahmed Ltd | Professional & scientific | 2012 |
| Baric (Consultants) Limited | Professional & scientific | 1992 |
| Barker's Dogs Limited | Other services | 2017 |
| Barley and Grape Ltd | Hospitality | 2019 |
| Barlogic Ltd | Hospitality | 2025 |
| Barlow Ridge Ltd | Real estate | 2009 |
| Barlows Assets LLP | | 2013 |
| Barlows Services Solutions LLP | | 2009 |
| Barlyn Consultants Limited | Arts & recreation | 2000 |
| Barn Close 2 Limited | Real estate | 2023 |
| Barnard and Brough (C.M.W.) Limited | Real estate | 1967 |
| Barnard and Brough (Properties) Limited | Real estate | 1982 |
| Barnard and Jestico Ltd | Wholesale & retail | 2022 |
| Barncote Limited | Real estate | 1995 |
| Barnett & Gyll Limited | Administrative & support | 2019 |
| Barnett Group Enterprises Limited | Financial services | 2023 |
| Barnetts Plumbing and Heating Ltd | Construction | 2022 |
| Barnsley House Properties Limited | Real estate | 2021 |
| Baron Developments (Brighton) Limited | Real estate | 2007 |
| Baron Estate Management Limited | Real estate | 2018 |
| Baron Management Limited | Real estate | 1996 |
| Baron's Bay Ltd | Real estate | 2015 |
| Barossa Capital Advisers Limited | Manufacturing | 2003 |
| Barouche Limited | Professional & scientific | 2026 |
| Barreflies Ltd | Other services | 2019 |
| Barrell Corp Limited | Real estate | 2020 |
| Barrhill Properties Limited | Real estate | 2000 |
| Barrhill Properties Southern Limited | Real estate | 2017 |
| Barrington Wood Developments Limited | Construction | 2021 |
| Barron & Boyd Ltd | Wholesale & retail | 2025 |
| Barrowdean Court Limited | Professional & scientific | 2002 |
| Barrowfield Lodge (Freehold) Limited | Households | 2018 |
| Barrowhall Limited | Administrative & support | 2003 |
| Barry's Boulangerie Limited | Wholesale & retail | 2019 |
| Barsadelic Ltd | Hospitality | 2024 |
| Bartholomew Flat Management Limited | Households | 1991 |
| Bartholomew Square Ltd | Real estate | 2014 |
| Bartholomews Tutorial College | Education | 1998 |
| Bartle & Co Creative Ltd | Professional & scientific | 2019 |
| Bartoline Limited | Manufacturing | 1912 |
| Barton Electrical (UK) Ltd | Wholesale & retail | 1968 |
| Barton Pest Control Ltd | Agriculture & fishing | 2025 |
| Bartram International Ltd | Manufacturing | 1995 |
| Basalt World Holdings Ltd | Manufacturing | 2023 |
| Base Films Limited | Information & communication | 2011 |
| Base One Holdings Ltd | Households | 2023 |
| Base One Response and Academy Ltd | Administrative & support | 2026 |
| Basebeat Limited | Real estate | 2000 |
| Baseline Plus Limited | Professional & scientific | 2017 |
| Bashfano Limited | Real estate | 2019 |
| Bashu Food Ltd | Hospitality | 2018 |
| Basik Products Limited | Information & communication | 2003 |