| Bailey Homes Development & Renovation Ltd | Construction | 2011 |
| Bains Venture Holdings Ltd | Financial services | 2025 |
| Balaji Management Solutions Ltd | Construction | 2022 |
| Balance & Beyond International Limited | Professional & scientific | 2024 |
| Baldylicious Ltd | Wholesale & retail | 2025 |
| Ballcock and Bits Limited | Wholesale & retail | 1988 |
| Ballerz Abroad Ltd | Administrative & support | 2026 |
| Baloshi Property Investments Ltd | Real estate | 2024 |
| Baltnet Limited | Professional & scientific | 2009 |
| Bamoran Ltd | Information & communication | 2026 |
| Bancourt Leisure Limited | Hospitality | 2004 |
| Banks-Services Ltd | Administrative & support | 2024 |
| Banksys Roofing Ltd | Construction | 2025 |
| Bantersaurus Ltd | Wholesale & retail | 2019 |
| Baobab Topco Limited | Wholesale & retail | 2024 |
| Bar Services Slough Limited | Hospitality | 2020 |
| Bar Torino Limited | Hospitality | 2014 |
| Barakah Chaii Delights Ltd | Hospitality | 2021 |
| Barbican Brickwork Ltd | Construction | 2023 |
| Barbie Limited | Professional & scientific | 2020 |
| Barco Limited | Administrative & support | 2000 |
| Barnes-Dallas Ltd | Real estate | 2026 |
| Barngate Commercial Limited | Construction | 2024 |
| BARRATT5BEANS Ltd | Hospitality | 2022 |
| Barronr Limited | Administrative & support | 2015 |
| Barta Theatre Academy (Bracknell) Ltd | Arts & recreation | 2018 |
| Barta Theatre Academy Ltd | Arts & recreation | 2018 |
| Bartley Forest Farm Limited | Agriculture & fishing | 2015 |
| Barton Analytical Ltd | Construction | 2023 |
| Bartop Limited | Hospitality | 2012 |
| Base Tanning Limited | Other services | 2022 |
| Basement Design LLP | | 2023 |
| Bashley Property Limited | Real estate | 2026 |
| Bashley Village Retail Limited | Wholesale & retail | 2026 |
| Basileus Statio Progressus Limited | Construction | 2025 |
| Basis Technologies Enablement Services Limited | Extraterritorial | 2009 |
| Basis Technologies Holdings Limited | Information & communication | 2007 |
| Basis Technologies International Limited | Information & communication | 2003 |
| Bath ROW Developments (Penryn) Limited | Real estate | 2010 |
| Bath ROW Developments Ltd | Real estate | 2004 |
| Bath Time Mobility Limited | Extraterritorial | 2012 |
| Bayleigh Group Ltd | Administrative & support | 2026 |
| BB Media Solutions Limited | Information & communication | 2025 |
| BB Sports Agency Ltd | Professional & scientific | 2018 |
| BBM Tiling Ltd | Construction | 2022 |
| BC Sourcing Ltd | Wholesale & retail | 2024 |
| BCA Speed Limited | Transport & logistics | 2024 |
| Bca’S Motors Ltd | Manufacturing | 2019 |
| BCR Recycling Limited | Water & waste | 2022 |
| BDV Family Investments Limited | Real estate | 2025 |
| BE Green Systems Limited | Administrative & support | 2000 |
| BE Hive Technologies Limited | Administrative & support | 2017 |
| BE Sports Marketing Ltd | Arts & recreation | 2025 |
| Beacon Support Services Limited | Wholesale & retail | 1999 |
| Beans 2 Go Ltd | Hospitality | 2022 |
| Bear Inc. Limited | Construction | 2021 |
| Bearcat Commercial Ltd | Professional & scientific | 2025 |
| Bearingway Limited | Professional & scientific | 2007 |
| Beau Construction Ltd | Real estate | 2024 |
| Beauty 'N' Lashes Limited | Wholesale & retail | 2023 |
| Becker Property Ltd | Real estate | 2026 |
| Becker Utilities Ltd | Energy | 2023 |
| BEE and Humble Ltd | Wholesale & retail | 2016 |
| Beech Court (Binfield) Management Company Limited | Hospitality | 2004 |
| Befinitive Estates Ltd | Real estate | 2020 |
| Behraaj Solutions Ltd | Information & communication | 2026 |
| Beijing Noodles Bracknell Limited | Hospitality | 2020 |
| Belle Arabia Co Ltd | Wholesale & retail | 2024 |
| Belstead Research Limited | Professional & scientific | 2012 |
| BEN Hunter Fine Art Ltd | Wholesale & retail | 2018 |
| BEN Marcus Decor Ltd | Construction | 2025 |
| Benelma Limited | Extraterritorial | 2018 |
| Beng Golf Limited | Education | 2019 |
| Benkimptontrading Ltd | Financial services | 2025 |
| Bennett Real Estate Ltd | Real estate | 2017 |
| Bennison Fitness Ltd | Other services | 2017 |
| Bensport Motor Cars Ltd | Manufacturing | 2026 |
| Benville and Marsh Limited | Construction | 1991 |
| Benyera Limited | Health & social care | 2015 |
| Berks United Football Club Limited | Arts & recreation | 2022 |
| Berkshire & Surrey Tree Surgeons Limited | Agriculture & fishing | 2024 |
| Berkshire Against Racism CIC | Other services | 2024 |
| Berkshire Agronomy Limited | Professional & scientific | 2026 |
| Berkshire Air Conditioning Ltd | Energy | 2023 |
| Berkshire Ballroom Limited | Arts & recreation | 2019 |
| Berkshire Basketball Club Community Interest Company | Arts & recreation | 2024 |
| Berkshire Birds of Prey CIC | Education | 2023 |
| Berkshire Brickwork Ltd | Construction | 2024 |
| Berkshire Building & Development Ltd | Construction | 2024 |
| Berkshire CKD LLP | | 2018 |
| Berkshire Clinical Ltd | Administrative & support | 2018 |
| Berkshire County Trailers Ltd | Manufacturing | 2016 |
| Berkshire East Plumbing & Heating Ltd | Construction | 2014 |
| Berkshire Education Travel Limited | Transport & logistics | 2010 |
| Berkshire Electrical & Security Limited | Construction | 2024 |
| Berkshire Electrical Limited | Manufacturing | 2017 |
| Berkshire Equine Assisted Therapy (Beat-Uk) Limited | Extraterritorial | 2014 |
| Berkshire Fascia and Soffits Ltd | Construction | 2020 |
| Berkshire Fire Safety Ltd | Construction | 2025 |
| Berkshire Fixings Limited | Wholesale & retail | 2004 |