| Belchior Limited | Wholesale & retail | 2026 |
| Belcroft Limited | Real estate | 2018 |
| Belgravia Village Store Ltd | Wholesale & retail | 2022 |
| Bell Heir Properties Ltd | Real estate | 2023 |
| Bell Heir Property Freehold Limited | Real estate | 2023 |
| Bellissemo Ltd. | Wholesale & retail | 2010 |
| Belmont Restaurant Ltd | Hospitality | 2023 |
| Belmont Superstore Limited | Wholesale & retail | 2004 |
| Belostudios Ltd | Information & communication | 2026 |
| Belville Ltd | Real estate | 2014 |
| Benedict Capital Properties Limited | Construction | 2016 |
| Benedicta Jalloh Ltd | Extraterritorial | 2024 |
| Benson (2024) Ltd | Wholesale & retail | 2024 |
| Benson Heights Ltd | Construction | 2015 |
| Bentavision Ltd | Arts & recreation | 2010 |
| Bentley Financial Associates Ltd | Real estate | 2020 |
| Bentley Property Associates Ltd | Real estate | 2016 |
| BEO Designers Limited | Wholesale & retail | 2018 |
| Beracah Healthcare Services Limited | Health & social care | 2014 |
| Berkeley Wholesale Ltd | Wholesale & retail | 2023 |
| Berlan Ltd | Transport & logistics | 2022 |
| Berly Ltd | Administrative & support | 2017 |
| Bernard Holdings Ltd | Hospitality | 2022 |
| Beryl Court Limited | Households | 1999 |
| Berz Ltd | Wholesale & retail | 2021 |
| Besar Developments Limited | Construction | 2015 |
| Besmart Capital Ltd | Information & communication | 2026 |
| Bespoke Champions League Ltd | Information & communication | 2025 |
| Bespoke India Travel Ltd | Administrative & support | 2011 |
| Bespoke Trails Ltd | Administrative & support | 2018 |
| Bessway Travel Limited | Transport & logistics | 2008 |
| Best Deal Construction Limited | Construction | 2008 |
| Best Diamond Services Ltd | Construction | 2015 |
| Best EGG Ltd | Arts & recreation | 2013 |
| Best Fashion Shop Ltd | Wholesale & retail | 2024 |
| Best Fibre Installation Ltd | Information & communication | 2026 |
| Best for Ever Ltd | Wholesale & retail | 2024 |
| Best Halal Meat Limited | Wholesale & retail | 2012 |
| Best Hospitality London Limited | Financial services | 2018 |
| Best Kebab and Chicken Ltd | Hospitality | 2021 |
| Best Tiles Pro Ltd | Construction | 2023 |
| Best Value Doors Limited | Extraterritorial | 1998 |
| Bestbay Limited | Real estate | 1990 |
| Bestbeast Ltd | Wholesale & retail | 2022 |
| Bestfood Supermarket Wembley Limited | Wholesale & retail | 2007 |
| Bestow Solutions Limited | Information & communication | 2022 |
| Bethshan Foundation Ltd. | Other services | 2020 |
| Better Capital Invest Ltd | Financial services | 2025 |
| Better Serviices Ltd | Construction | 2024 |
| Betterspecs Wembley Limited | Wholesale & retail | 2007 |
| Betterway UK Ltd | Wholesale & retail | 2023 |
| BEU Construction Ltd | Construction | 2022 |
| Beyond Borders U.K Limited | Other services | 2025 |
| Beyond Sarah Ltd | Administrative & support | 2019 |
| Bezza GAS Services Ltd | Construction | 2017 |
| BF French Polisher Ltd | Construction | 2016 |
| BG Options Ltd | Construction | 2020 |
| BG Steel Fixers Limited | Administrative & support | 2022 |
| BGF Holdings Limited | Financial services | 2020 |
| BH Luxe Ltd | Wholesale & retail | 2020 |
| BHA Propco Ltd | Real estate | 2020 |
| Bhagat Services Limited | Transport & logistics | 2025 |
| Bhandarikp Ltd | Wholesale & retail | 2026 |
| Bhargavi Trading Ltd | Wholesale & retail | 2026 |
| Bhatia London Ltd | Wholesale & retail | 2018 |
| Bhattachan Brothers Investment Group Limited | Real estate | 2017 |
| Bhaus IP Ltd. | Administrative & support | 2012 |
| Bhaus Ltd. | Financial services | 2012 |
| Bhavani Limited | Wholesale & retail | 2019 |
| Bhavik & Prity Limited | Real estate | 2014 |
| Bhavik Patel Ltd | Professional & scientific | 2026 |
| Bhavsar Consultants Limited | Professional & scientific | 2026 |
| Bhayala Construction Ltd | Construction | 2025 |
| Bhogal Dental Limited | Health & social care | 2024 |
| BHP Car Sales Ltd | Wholesale & retail | 2014 |
| Bhudia Holdings Ltd | Real estate | 2026 |
| Bhumi RAJ Ltd | Wholesale & retail | 2025 |
| Bhura Partners Ltd | Real estate | 2026 |
| Bhvai UK Limited | Wholesale & retail | 2022 |
| Bi-Folds Direct Limited | Construction | 2026 |
| BIB100 Ltd | Real estate | 2018 |
| BID Capital Limited | Professional & scientific | 1999 |
| Bidd Limited | Health & social care | 2017 |
| Bidey Ltd | Wholesale & retail | 2026 |
| Bidwell Flats Management Company Limited | Other services | 1984 |
| Bidwell Freehold Limited | Households | 2004 |
| Bifrost Enterprises Ltd | Health & social care | 2022 |
| Bifrost Real Estate Ltd | Real estate | 2022 |
| Big BEN Plumbing Ltd | Construction | 2021 |
| Big Bizz Ltd | Wholesale & retail | 2026 |
| Big Fish Tutors Limited | Education | 2015 |
| Big KAY Transport Solutions Ltd | Transport & logistics | 2022 |
| Big Trends Limited | Wholesale & retail | 2018 |
| Big Wave Brands Ltd | Wholesale & retail | 2019 |
| Bigbites Foods Ltd | Hospitality | 2026 |
| Biggerscaff Ltd | Construction | 2018 |
| Biglook Ltd | Information & communication | 2017 |
| Bijal Properties Ltd | Real estate | 2025 |
| Biko Medics Ltd | Health & social care | 2024 |
| Bilal Pharm Healthcare Ltd Limited | Health & social care | 2026 |