| Back to Eden Ltd | Administrative & support | 2024 |
| BAD Dog Ltd | Hospitality | 2020 |
| BAG of Eggs Media Limited | Professional & scientific | 2024 |
| Bageshwari Fancy Ltd | Wholesale & retail | 2025 |
| Bagheswori Fancy Limited | Wholesale & retail | 2025 |
| Bagua Home Ltd | Real estate | 2025 |
| Bahari Consultancy Ltd | Professional & scientific | 2024 |
| Baila Khan Incorporated Ltd | Health & social care | 2017 |
| Bailey Grove Transport Ltd | Transport & logistics | 2021 |
| Bailey Security Limited | Administrative & support | 2024 |
| Baisie Skin & Laser Clinic Ltd | Other services | 2025 |
| Bajer Ltd | Transport & logistics | 2015 |
| Bajwa Associates (London) Ltd | Professional & scientific | 2017 |
| Bajwa Associates (Property) Ltd | Real estate | 2021 |
| Baker in the House Ltd | Manufacturing | 2025 |
| Baker Mechanical Limited | Construction | 2019 |
| Baker Property MGT Ltd | Real estate | 2022 |
| Bakers Court (Stanwell) Management Company Limited | Households | 1992 |
| Baks Osteopathy Ltd | Health & social care | 2011 |
| Baladro Ltd | Wholesale & retail | 2025 |
| Balance Treatment Limited | Health & social care | 2026 |
| Balanv Ltd | Transport & logistics | 2019 |
| Balatone Ltd | Wholesale & retail | 2020 |
| Baldock Investments Limited | Real estate | 2016 |
| Baldwin's Place (Management) Limited | Households | 2005 |
| Balfours Bay Limited | Extraterritorial | 2006 |
| Balimeister Ltd | Wholesale & retail | 2020 |
| Balinea Ltd | Construction | 2010 |
| Balkanika Foods Kent Ltd | Wholesale & retail | 2021 |
| Ballard & Mitchell (Builders) Limited | | 1986 |
| Ballin Maidstone Limited | Hospitality | 2020 |
| Balogh 391 Ltd | Transport & logistics | 2024 |
| Balogh Tyres Ltd | Wholesale & retail | 2020 |
| Balreed Digitec (Group) Limited | Professional & scientific | 2009 |
| Balreed Digitec (North) Limited | Professional & scientific | 2006 |
| Balreed Digitec (SE) Limited | Professional & scientific | 2003 |
| Balreed Digitec (UK) Limited | Professional & scientific | 2003 |
| Baltag Trans Ltd | Transport & logistics | 2021 |
| Baltic Energy Limited | Construction | 2017 |
| Bamboolinos Ltd | Wholesale & retail | 2025 |
| Bamubamu Foods Ltd | Wholesale & retail | 2025 |
| Bamuk Group Limited | Administrative & support | 2012 |
| Banbury Flooring & Tiling Limited | Construction | 2012 |
| Bank Street Mews Management Company Limited | Real estate | 2005 |
| Bankside Dwellings LLP | | 2016 |
| Bankside Property Limited | Professional & scientific | 2001 |
| Banxtron I.T. Limited | Information & communication | 2014 |
| Banyan & Bricks Ltd | Real estate | 2025 |
| Bar B QUE Base Foods Limited | Hospitality | 2023 |
| Bar Motorworx Limited | Wholesale & retail | 2021 |
| Baraka Consulting Limited | Professional & scientific | 2018 |
| Bardom Group Ltd | Administrative & support | 2017 |
| Barella Limited | Hospitality | 2025 |
| Baremoi Consults Ltd | Information & communication | 2021 |
| Barero Ltd | Wholesale & retail | 2024 |
| Barex Brokers Limited | Administrative & support | 1979 |
| Bargrove Developments Ltd | Construction | 2024 |
| Bargrove Investments Limited | Real estate | 2016 |
| Barham Jointing Limited | Professional & scientific | 2014 |
| Baritta Ltd | Wholesale & retail | 2026 |
| Barjac Properties | | 1986 |
| Barker Munro Recruitment Limited | Administrative & support | 2010 |
| Barkers Home of Interiors Limited | Wholesale & retail | 2025 |
| Barming Cad/Cam Services Limited | Professional & scientific | 1996 |
| Barming Community Sports CIC | Arts & recreation | 2026 |
| Barming Post Limited | Wholesale & retail | 2010 |
| Barnes & Bloom Studio Ltd | Professional & scientific | 2020 |
| Barnes and Goldman Limited | Manufacturing | 2015 |
| Barnes Common Limited | Real estate | 2013 |
| Barnes Conservation Limited | Other services | 2020 |
| Barneswood Ltd | Real estate | 2018 |
| Baron Manors Ltd | Real estate | 2021 |
| Barons Automotive Limited | Wholesale & retail | 1983 |
| Barons Autostar Limited | Wholesale & retail | 1964 |
| Barons Place Holdings Limited | Professional & scientific | 2011 |
| Baros Technology Ltd | Wholesale & retail | 2011 |
| Barratt Asset Management UK Ltd | Financial services | 2012 |
| Barratt Property Management Ltd | Real estate | 2020 |
| Barratts 24 Holdings Ltd | Financial services | 2024 |
| Barry Drew Accountant & Taxation Advisor Ltd | Professional & scientific | 2017 |
| Barry Forder Limited | Other services | 1978 |
| Barry Quinn Stoneworks Limited | Mining & quarrying | 2022 |
| Barss Ltd | Construction | 2018 |
| Bart Flex Ltd | Transport & logistics | 2018 |
| Base Detailing Ltd | Administrative & support | 2021 |
| Bash Grill Kingsbury Road Ltd | Hospitality | 2022 |
| Basia Properties Limited | Real estate | 2022 |
| Basted Mill (Borough Green) Management Limited | Administrative & support | 1997 |
| Batchelor Brothers Limited | Real estate | 1981 |
| Bateson Larkman Property Ltd | Real estate | 2017 |
| Battle Diagnostic Imaging Ltd | Health & social care | 2014 |
| Bauxite Limited | Health & social care | 2026 |
| Bavarian Wizards Ltd | Extraterritorial | 2023 |
| Bax-Shop.Co.Uk Limited | Administrative & support | 2015 |
| Baxter Contracting Ltd | Construction | 2024 |
| Baxter Homes (South East) Limited | Construction | 2004 |
| Baxter Homes (West Malling) LLP | | 2015 |
| Baxter Properties (Beadnell Road) Limited | Real estate | 2019 |
| Bay Business Consultants Limited | Information & communication | 2022 |
| Bay Horse Pictures Ltd | Information & communication | 2014 |