| Bryar Barber Ltd | Other services | 2025 |
| Bryn Cottages Ltd | Extraterritorial | 2022 |
| Bryn Jones Associates Limited | Professional & scientific | 2000 |
| Bryte Sunshine Limited | Health & social care | 2014 |
| BS Craft Ltd | Agriculture & fishing | 2026 |
| BS ECB Glasgow Ltd | Wholesale & retail | 2014 |
| BS Removals Ltd | Transport & logistics | 2026 |
| BS Surgical Instruments Ltd | Manufacturing | 2023 |
| BS2 Events Ltd | Hospitality | 2025 |
| BSB FX Trading Ltd | Other services | 2024 |
| BSB IT Solutions Ltd | Information & communication | 2014 |
| Bsep Investments Limited | Real estate | 2026 |
| Bsgillroofing Ltd | Construction | 2025 |
| BSJ Civils Ltd | Construction | 2023 |
| BSK Building and Maintenance Limited | Construction | 2004 |
| BSK Tech Ltd | Professional & scientific | 2026 |
| Bsmsa Education Ltd | Administrative & support | 2011 |
| Bsmsa Limited | Education | 2019 |
| BSS Building Services Ltd | Construction | 2020 |
| BSS Transport Ltd | Transport & logistics | 2018 |
| BSU Transport Ltd | Transport & logistics | 2016 |
| Bsupported Limited | Administrative & support | 2021 |
| BT Design Limited | Professional & scientific | 2013 |
| Bt&Bn Properties Ltd | Real estate | 2025 |
| BTG Auto Repairs Ltd | Wholesale & retail | 2026 |
| BTL Trans Ltd | Transport & logistics | 2017 |
| BTP Foodservice Ltd | Hospitality | 2023 |
| BTR Electrical Services Ltd | Construction | 2020 |
| BTR Fire & Security Limited | Construction | 2024 |
| BTR Group Holdings Limited | Financial services | 2025 |
| BTR Homes Limited | Real estate | 2025 |
| Bubbles Hand Car Wash Wolvs Ltd | Wholesale & retail | 2025 |
| Bubbly Drylining Ltd | Construction | 2023 |
| Bucharest Mini Market 2023 Ltd | Wholesale & retail | 2023 |
| Buckthorn Media Limited | Professional & scientific | 2025 |
| Bucorvusback Ltd | Administrative & support | 2020 |
| Budget Plant Services Limited | Administrative & support | 2016 |
| Budget Skip Services Limited | Administrative & support | 2001 |
| Budir Property Management Ltd | Real estate | 2021 |
| Budjeti Limited | Information & communication | 2026 |
| Build an Experience Ltd | Administrative & support | 2023 |
| Build Them Limited | Construction | 2024 |
| Builders Arms Wolves Ltd | Hospitality | 2023 |
| Builderx Ltd | Construction | 2026 |
| Buildex Builders Birmingham Limited | Construction | 2008 |
| Buildex Wholesale Ltd | Wholesale & retail | 2026 |
| Building Blocks Limited | Real estate | 1989 |
| Building Development Ltd | Construction | 2019 |
| Building Tranquil Surroundings - BTS Ltd | Construction | 2018 |
| Buildsure Properties Ltd | Construction | 2025 |
| Buildzaar Limited | Construction | 2025 |
| Buildzest Limited | Extraterritorial | 2010 |
| Built 2 Entertain Limited | Manufacturing | 2019 |
| Bujud Limited | Health & social care | 2025 |
| Bukylade Ltd | Health & social care | 2025 |
| Bulken Limited | Wholesale & retail | 2022 |
| Bull Ventilation Ltd | Manufacturing | 2025 |
| Bulls Transport Ltd | Transport & logistics | 2026 |
| Bulybasha Creative Ltd | Wholesale & retail | 2026 |
| Bumble-B Propery Ltd | Construction | 2020 |
| Bunchi Ltd | Wholesale & retail | 2021 |
| Bundam Apparel Limited | Wholesale & retail | 2025 |
| Bundleflow Limited | Wholesale & retail | 2026 |
| Bungay & Baloo Limited | Real estate | 2024 |
| Bunmzie Resource Ltd | Real estate | 2020 |
| Buono Subs Limited | Hospitality | 2008 |
| Buraq Arabia Company Ltd | Wholesale & retail | 2026 |
| Bureta Limited | Administrative & support | 2017 |
| Burger BOI Franchise Limited | Hospitality | 2021 |
| Burger BOI Ltd | Hospitality | 2020 |
| Burgerbae 'N Shakes Limited | Hospitality | 2025 |
| Burgundy Group Ltd | Financial services | 2022 |
| Burgundy Sky Homes Ltd | Real estate | 2022 |
| Burhan Traders Ltd | Wholesale & retail | 2025 |
| Burhani Holdings Ltd | Wholesale & retail | 2026 |
| Burke Bros Moving Group Limited | Extraterritorial | 1988 |
| Burke Bros Recovery Limited | Wholesale & retail | 2014 |
| Burmi Group Ltd | Financial services | 2023 |
| Burmi Investments Ltd | Financial services | 2023 |
| Burns Carpentry Services Limited | Construction | 2012 |
| Burtling International Limited | Manufacturing | 2017 |
| Burtonbrown Ltd | Real estate | 2019 |
| Busanalytics Ltd | Financial services | 2011 |
| Bushbury ALL in One Super Market Ltd | Wholesale & retail | 2016 |
| Bushbury Fencing & Gates Limited | Construction | 2026 |
| Bushbury Glass Limited | Construction | 2003 |
| Bushbury Motors Ltd | Wholesale & retail | 2021 |
| Bushbury News & OFF Licence Ltd | Wholesale & retail | 2014 |
| Bushbury Plant & Tool Hire Limited | Administrative & support | 2009 |
| Bushbury Skip Hire Ltd | Water & waste | 2022 |
| Business and Contract Resolutions Limited | Professional & scientific | 2016 |
| Business Development & Human Resources Consultants Limited | Other services | 2014 |
| Business Sales (West Midlands) Limited | Professional & scientific | 2012 |
| Business Savvy UK Limited | Professional & scientific | 2019 |
| Busy Bees Mascots Limited | Administrative & support | 2020 |
| Busy Buildings Ltd | Real estate | 2019 |
| Busy Childcare LLP | | 2016 |
| Butcha Ltd | Wholesale & retail | 2021 |
| Butchers Yard Ltd | Wholesale & retail | 2023 |
| Buttar Brothers Transport Ltd | Transport & logistics | 2026 |