| Bluebird Trading Limited | Real estate | 2015 |
| Bluecrest Global Ltd | Wholesale & retail | 2026 |
| Bluefin Cyber Limited | Information & communication | 2017 |
| Bluefox Boards Limited | Arts & recreation | 2021 |
| Bluefox Water Sports Limited | Arts & recreation | 2019 |
| Bluegreen Financial Ltd | Extraterritorial | 2011 |
| Bluegreen Networks Ltd | Information & communication | 2026 |
| Bluehorizon Solutions Ltd | Information & communication | 2006 |
| Bluejay Hayes Ltd | Construction | 2023 |
| Blueline Strategies Limited | Professional & scientific | 2025 |
| Blueprint Displays Limited | Professional & scientific | 2015 |
| Bluerose Environmental Services Ltd | Professional & scientific | 2022 |
| Bluestart Property Limited | Real estate | 2021 |
| Bluestone Management Ltd | Professional & scientific | 2013 |
| Bluestones Developments Ltd | Real estate | 2025 |
| Bluewaters Plumbing & Heating Limited | Construction | 2008 |
| Bluewave Innovation Ltd | Professional & scientific | 2023 |
| Bluewaves Staycation Ltd | Real estate | 2024 |
| Blumenthal Ltd | Real estate | 2020 |
| Blushington Limited | Other services | 2018 |
| Blusky Technology Services Ltd | Information & communication | 2022 |
| Blyth Tech Solutions Ltd | Wholesale & retail | 2020 |
| BMC Digital Services Dorset Ltd | Manufacturing | 2010 |
| Bmibaby.Com Ltd | Extraterritorial | 2024 |
| BMP Direct Ltd | Professional & scientific | 2022 |
| BNR Contracting Ltd | Construction | 2023 |
| BNV Global Ltd | Manufacturing | 2021 |
| Boat-House Interiors Ltd | Manufacturing | 2020 |
| Boatsales (Christchurch) Ltd | Professional & scientific | 2004 |
| Bobobird Ltd | Wholesale & retail | 2025 |
| Bocchetta Ceramica Limited | Wholesale & retail | 1998 |
| Body HQ Limited | Other services | 2025 |
| Body Jewellery Limited | Administrative & support | 2002 |
| Body Shape Pilates Ltd | Arts & recreation | 2014 |
| Boiler Geeks Ltd | Construction | 2020 |
| Boisterous Books Limited | Information & communication | 2014 |
| Bokers Farm Limited | Agriculture & fishing | 2015 |
| Bolagsregistrering Ltd | Administrative & support | 2016 |
| Bold Media Productions Ltd | Professional & scientific | 2021 |
| Boldframe Limited | Wholesale & retail | 2025 |
| Bolingbroke Estates Limited | Real estate | 2012 |
| Bolthaus Property Group Ltd | Real estate | 2025 |
| Bolton Lodge Management Co. Limited | Administrative & support | 1998 |
| Bommg Group Ltd | Financial services | 2023 |
| Bommg Ltd | Information & communication | 2023 |
| Bomo Beach Festival Ltd | Arts & recreation | 2026 |
| Bomo Coffee House Ltd | Hospitality | 2025 |
| Bomoco Developments Ltd. | Real estate | 2007 |
| Bonafidehiro Ltd | Information & communication | 2024 |
| Bonbe Holdings Limited | Financial services | 2021 |
| Bond Consulting Limited | Professional & scientific | 2014 |
| Bond Holiday Lets Ltd | Hospitality | 2023 |
| Bond Property Lettings Ltd | Real estate | 2025 |
| Bondation Fabrications Limited | Manufacturing | 2002 |
| Bondcap Ltd | Real estate | 2018 |
| Bonded by Bricks Ltd | Real estate | 2025 |
| Bondi Outdoor Co Ltd | Wholesale & retail | 2026 |
| Bone Dust Bars Ltd | Hospitality | 2013 |
| BONES4DOGS Ltd | Wholesale & retail | 2021 |
| Bonita One Management Limited | Real estate | 2015 |
| Bonnie BON Projects Ltd | Administrative & support | 2023 |
| Bonsai Landscapes Ltd | Administrative & support | 2025 |
| Bonuscare Limited | Health & social care | 2019 |
| Booker Plastering & Drylining Ltd | Construction | 2023 |
| Books Line Ltd | Manufacturing | 2020 |
| Bookwize Limited | Wholesale & retail | 1998 |
| Boon & Leung Property Limited | Real estate | 2025 |
| Boosterpack Limited | Information & communication | 2025 |
| Boot Bananas Ltd | Manufacturing | 2012 |
| BOP Global Ltd | Wholesale & retail | 2025 |
| Boratech Solutions Ltd | Information & communication | 2025 |
| Bordeaux (Management) Limited | Households | 2022 |
| Bordergreat Limited | Construction | 2007 |
| Borl Limited | Other services | 2024 |
| Born One Ltd | Wholesale & retail | 2025 |
| Bortolin Kemo NE Limited | Wholesale & retail | 2005 |
| Boruc AFC Limited | Education | 2021 |
| Bosco Projects (Copeland) Limited | Real estate | 2023 |
| Bosco Projects Limited | Construction | 2021 |
| Boscombe Grove Limited | Administrative & support | 2017 |
| Boscombe Pier View Limited | Real estate | 2004 |
| Bossman's Convenience Ltd | Wholesale & retail | 2023 |
| Bossr Ltd | Information & communication | 2025 |
| Bostan Ltd | Other services | 2017 |
| Boston Lodge (Bournemouth) Limited | Households | 2003 |
| Botanical Jade Ltd | Information & communication | 2019 |
| Bothal Falls Ltd | Wholesale & retail | 2015 |
| Botiva Ltd | Wholesale & retail | 2025 |
| Bouballo Ltd | Wholesale & retail | 2025 |
| Bouchard Film Services Ltd. | Information & communication | 2016 |
| Bouge Avec MOI Studio Ltd | Health & social care | 2024 |
| Bounce Color Ltd | Information & communication | 2019 |
| BOUND2IMPRESS Resin & Landscaping Ltd | Construction | 2025 |
| Boundless Golf CIC | Education | 2024 |
| Bouran Ltd | Information & communication | 2021 |
| Bourke Legal Limited | Professional & scientific | 2026 |
| Bourn Homes Group Limited | Real estate | 2015 |
| Bourne Cars Ltd | Wholesale & retail | 2017 |
| Bourne Construction & Maintenance Limited | Construction | 1999 |
| Bourne Construction Engineering Ltd. | Construction | 1988 |