| Baylis Bearings & Components Ltd | Wholesale & retail | 2025 |
| Baylis Holdings Limited | Extraterritorial | 2016 |
| Bayside Developments Ltd | Construction | 2011 |
| Bbms (Swanwick) Limited | Wholesale & retail | 2007 |
| BBR Capital Limited | Other services | 2019 |
| BBS Installations Limited | Construction | 2014 |
| Bbsol Ltd | Information & communication | 2010 |
| Bbstotal Limited | Administrative & support | 2007 |
| BCD High Trees Limited | Households | 2008 |
| BCO Global Ltd | Transport & logistics | 2024 |
| Bdbuild Enabling Services Limited | Construction | 2022 |
| BE in the Know Limited | Other services | 2023 |
| BEA Solutions Limited | Information & communication | 2008 |
| Beach Events & Solutions Limited | Arts & recreation | 2011 |
| Beach Road Limited | Real estate | 2013 |
| Beagle Associates Ltd | Real estate | 2025 |
| Beagle Enterprises Limited | Arts & recreation | 2016 |
| Beagle.Ai Ltd | Information & communication | 2024 |
| Bear Building Solutions Ltd | Construction | 2018 |
| Bear GAS & Plumbing Limited | Construction | 2025 |
| Bear Metal Industries Ltd | Manufacturing | 2016 |
| Bearcat Consulting Limited | Administrative & support | 2023 |
| Bearroc Real Estate Limited | Real estate | 2024 |
| Bearwood Physiotherapy Ltd. | Health & social care | 2017 |
| Beau Beauty Treatments Limited | Other services | 2023 |
| Beauford 3 Ltd | Construction | 2022 |
| Beauford 4 Ltd | Construction | 2023 |
| Beauford 6 Ltd | Real estate | 2022 |
| Beauford CV Ltd | Construction | 2023 |
| Beauford Investments Ltd | Construction | 2017 |
| Beauford Management 5 Ltd | Real estate | 2025 |
| Beauty by Lauren-Ann Academy Ltd | Other services | 2022 |
| Beauty by Lauren-Ann Ltd | Other services | 2023 |
| Beck Electrical Contracting Ltd | Construction | 2025 |
| Beck Land and Properties Limited | Real estate | 2018 |
| Beckingham's Limited | Other services | 2010 |
| Bedford Grove Films Ltd | Information & communication | 2024 |
| BEE Big Agency Ltd | Professional & scientific | 2022 |
| BEE Yourself Limited | Health & social care | 2017 |
| Bee's Accountancy Ltd | Professional & scientific | 2011 |
| Beef Junkie Ltd | Extraterritorial | 2024 |
| Beemark Limited | Professional & scientific | 2008 |
| Beespoke Hair Ltd | Other services | 2023 |
| Beige Acquisition Limited | Real estate | 2025 |
| Belgrave Construction Ltd | Construction | 2016 |
| Belgravia Securities (North Weald) Limited | Professional & scientific | 1999 |
| Believable Ltd | Health & social care | 2024 |
| Belize Elite PT Limited | Arts & recreation | 2017 |
| Bell Projects Limited | Administrative & support | 2022 |
| Bellamy-Woolmer Ltd | Hospitality | 2026 |
| Belle DE VIE Hampshire Ltd | Other services | 2024 |
| Bellissimo Hair Denmead Ltd | Other services | 2021 |
| Bello Properties Limited | Real estate | 2016 |
| Bellsmith Scaffolding Ltd | Construction | 2022 |
| Belvidere Property Limited | Construction | 2023 |
| BEN Addems Ltd | Construction | 2025 |
| BEN H Services Ltd | Construction | 2025 |
| Benabek Limited | Administrative & support | 2025 |
| Benchmark Accounting Limited | Real estate | 2008 |
| Benchmark Musical Theatre Ltd | Arts & recreation | 2021 |
| Benham Building Services Limited | Construction | 2013 |
| Benjamelia Limited | Administrative & support | 2023 |
| Benn Coffin Ltd | Professional & scientific | 2019 |
| Bennett Winch Ltd | Wholesale & retail | 2014 |
| Bentley Building Services (Southern) Limited | Construction | 2012 |
| Bentley Executives Limited | Administrative & support | 2005 |
| Bentley Parker Medical Limited | Health & social care | 2019 |
| Bentley Property (Hampshire) Ltd | Construction | 2011 |
| Bequia Management and Consultancy Ltd | Real estate | 2026 |
| Bere Holistics Ltd | Health & social care | 2026 |
| Berewood Electrical Ltd | Construction | 2022 |
| Berewood Pro Projects Ltd | Construction | 2025 |
| Berkeley FM Limited | Other services | 2019 |
| Berkeley Matheson Investment Group Limited | Financial services | 2022 |
| Berkeley Surfacing Contractors Limited | Wholesale & retail | 1998 |
| Berks & Hants Fascias & Guttering Ltd | Construction | 2026 |
| Berks & Hants Property Maintenance Ltd | Construction | 2022 |
| Berks & Hants Roofing Ltd | Extraterritorial | 2024 |
| Bernard Landi Ltd | Professional & scientific | 1999 |
| Bersha Limited | Real estate | 2019 |
| Bespoke Bedrooms Ltd | Construction | 2013 |
| Bespoke Business Training Ltd | Education | 2019 |
| Bespoke Cctv Ltd | Information & communication | 2019 |
| Bespoke Marketing and Consulting Limited | Extraterritorial | 1999 |
| Bespoke Telecoms Limited | Information & communication | 2010 |
| Bespoke UK Group Ltd | Information & communication | 2021 |
| Best Choice Estate Ltd | Real estate | 2015 |
| Best Executive Service Travel Ltd | Transport & logistics | 2026 |
| Best Friend Bathroom Installations Ltd | Construction | 2025 |
| Best One News Limited | Wholesale & retail | 2017 |
| Best Version Consulting Ltd | Administrative & support | 2024 |
| Best Widley Car Wash Ltd | Other services | 2024 |
| Better 4 Hooves Limited | Wholesale & retail | 2010 |
| Bettles-Hall Investments Ltd | Financial services | 2023 |
| Betty Berry Ltd | Wholesale & retail | 2020 |
| Beverley Ltd | Hospitality | 2023 |
| Bexsters Services Limited | Health & social care | 2008 |
| Beyond Music UK Limited | Wholesale & retail | 2014 |
| BF GAS Services Limited | Manufacturing | 2015 |
| Bgty Ltd | Health & social care | 2014 |