| Britdrop Express Ltd | Wholesale & retail | 2025 |
| Brite Consulting Limited | Information & communication | 2023 |
| Britehome Properties Limited | Real estate | 2018 |
| Britfarm Supply Co Limited | Wholesale & retail | 2021 |
| British Bangladeshi Accountants Association Ltd | Other services | 2016 |
| British Chinese Culture | Professional & scientific | 2011 |
| British Hajj and Umrah Council C.I.C. | Other services | 2016 |
| Britline Transfers Ltd | Transport & logistics | 2026 |
| Britnaire Limited | Financial services | 2007 |
| Britnex Ltd | Real estate | 2024 |
| Briton Logistics Ltd | Transport & logistics | 2021 |
| Briton Properties International Ltd | Real estate | 2024 |
| Briton Properties Ltd | Real estate | 2021 |
| Briton Security Services Ltd | Wholesale & retail | 2022 |
| Brits Property Ltd | Real estate | 2023 |
| Britsafe Qualifications UK Limited | Public administration | 2023 |
| Britsky Ltd | Wholesale & retail | 2016 |
| Britsway Ltd | Wholesale & retail | 2025 |
| Britt SEC Solutions Ltd | Administrative & support | 2024 |
| Brittac Ltd | Manufacturing | 2010 |
| Brittania Accounting Services Limited | Professional & scientific | 2008 |
| Brittania Consultancy Services Ltd | Information & communication | 2023 |
| Brittania Courier Services Ltd | Transport & logistics | 2026 |
| Brittel Limited | Wholesale & retail | 2025 |
| Brittraders Ltd | Wholesale & retail | 2024 |
| Britz College London Ltd | Education | 2012 |
| Britz Communication Ltd | Wholesale & retail | 2025 |
| Britz Households Ltd | Wholesale & retail | 2025 |
| Britz Zone Ltd | Information & communication | 2017 |
| Briviox International Ltd | Professional & scientific | 2026 |
| Brivon Trading Ltd | Wholesale & retail | 2026 |
| Brix Services Limited | Construction | 2024 |
| Brixly Ltd | Wholesale & retail | 2026 |
| Brlh Services Ltd | Information & communication | 2025 |
| BRM Security Ltd | Administrative & support | 2024 |
| BRO Solutions Ltd | Construction | 2026 |
| Broachuk Ltd | Households | 2019 |
| Broadcast Communications Portal Ltd | Information & communication | 2019 |
| Broadhurst Homes Ltd | Real estate | 2020 |
| Broadview Consultancy Ltd | Professional & scientific | 2023 |
| Broadway Accountants Limited | Professional & scientific | 2024 |
| Broadway Ecommerce Limited | Wholesale & retail | 2026 |
| Broadway Saloon Ltd | Other services | 2019 |
| Broadway UK Services Limited | Construction | 2018 |
| BROADWAY14 Ltd | Hospitality | 2025 |
| Brocade Bridal Wear Ltd | Wholesale & retail | 2014 |
| Brocade Clothing Ltd | Wholesale & retail | 2014 |
| Brochet Services Ltd | Transport & logistics | 2019 |
| Brock Cars Ltd | Wholesale & retail | 2025 |
| Brockley Retail Ltd | Wholesale & retail | 2026 |
| Brockwell Realty Limited | Real estate | 2024 |
| Bromexa Soft Ltd | Information & communication | 2025 |
| Brompton Innovations KBS Limited | Health & social care | 2013 |
| Brontobyte Ltd | Information & communication | 2022 |
| Bronx Outlet Limited | Wholesale & retail | 2024 |
| Bronze Bricks Ltd | Real estate | 2024 |
| Brook Cliff Limited | Wholesale & retail | 2020 |
| Brook Green UK DMC Limited | Administrative & support | 2015 |
| Brook House Pharma Limited | Wholesale & retail | 2018 |
| Brook Road Ltd | Transport & logistics | 2025 |
| Brookreid Ltd | Professional & scientific | 2013 |
| Brooks Sustain Technical Ltd | Professional & scientific | 2021 |
| Brooksglade Freehold Limited | Households | 2018 |
| Brooksglade Management (E18) Limited | Households | 1986 |
| Brookside Electrical Limited | Construction | 1998 |
| Brookside Estates Ltd | Real estate | 2001 |
| Brookstreet Capital Ltd | Financial services | 2023 |
| Brother Home Construction Limited | Construction | 2026 |
| Brothers (London) Limited | Extraterritorial | 2013 |
| Brow Goals London Limited | Other services | 2026 |
| Brownhorse Investments Limited | Real estate | 2023 |
| BRS Flav Ltd | Construction | 2020 |
| Bruce Grove Property Management Ltd | Real estate | 2026 |
| Bruce Redwin & Co Limited | Professional & scientific | 2017 |
| Brunch Wala Ltd | Hospitality | 2022 |
| Brunda Ltd | Real estate | 2025 |
| Brunswick 20-20 Limited | Financial services | 2021 |
| Brunswick Trading Limited | Wholesale & retail | 2002 |
| Brunt Work Ltd | Professional & scientific | 2025 |
| Bruntx Ltd | Information & communication | 2026 |
| Brushcode Limited | Information & communication | 2026 |
| BRV London Limited | Construction | 2018 |
| Bryan's Property Ltd | Real estate | 2025 |
| Bryban Ltd | Construction | 2024 |
| Brywell Engineers Limited | Information & communication | 2002 |
| BS Couriers Limited | Transport & logistics | 2024 |
| BS Electrical Services (UK) Ltd | Construction | 2006 |
| BS Properties Investment (London) Ltd | Real estate | 2023 |
| BS Properties Investment Ltd | Real estate | 2021 |
| BS10 Ltd | Hospitality | 2018 |
| Bsan Trading Limited | Information & communication | 2013 |
| BSB GRP Ltd | Real estate | 2025 |
| BSB Utilities Limited | Professional & scientific | 2025 |
| Bsbuy Ltd | Wholesale & retail | 2026 |
| BSC Building UK Ltd | Construction | 2023 |
| BSC Control Limited | Wholesale & retail | 2026 |
| Bsds IT Consulting Ltd | Information & communication | 2021 |
| BSE 2.4 Ltd | Real estate | 2024 |
| BSE 2.5 Ltd | Real estate | 2024 |
| BSE 2.6 Ltd | Real estate | 2024 |