| Bond Electrics Ltd | Construction | 2020 |
| Bond Stratos Land Ltd | Real estate | 2022 |
| Bone and Body Clinic Limited | Health & social care | 2023 |
| Boneyard Holdings Ltd | Financial services | 2025 |
| Boneyard London Ltd | Manufacturing | 2020 |
| Bonne Franquette Limited | Hospitality | 2021 |
| Bonsor Penningtons Commercial | | 1993 |
| Bonsor Penningtons Limited | Real estate | 1996 |
| Bonvivan Ltd | Hospitality | 2023 |
| Bora Enterprise Limited | Wholesale & retail | 2014 |
| Border Equity Group Limited | Professional & scientific | 1999 |
| Border Equity Investments Limited | Professional & scientific | 1998 |
| Bordon Pharma Ltd | Wholesale & retail | 2024 |
| Bossmaina Limited | Professional & scientific | 2011 |
| Boszke Construction Limited | Construction | 2007 |
| Botoxo Aesthetics Limited | Other services | 2021 |
| Bottle Top Drinks Ltd | Wholesale & retail | 2013 |
| Bould Consulting Limited | Other services | 2016 |
| Bourne Path Limited | Health & social care | 2020 |
| BOW Central Management Company Limited | Households | 2003 |
| Bowenfels Limited | Information & communication | 2017 |
| Bowens Pictures Ltd | Information & communication | 2014 |
| Bowmal Properties Limited | Households | 2016 |
| Boxgolf Global Limited | Arts & recreation | 2026 |
| Boyes 'N Berry Medical Education Services Limited | Professional & scientific | 2019 |
| Bozholidays International Ltd | Other services | 2016 |
| BPM Build & Design Ltd | Construction | 2026 |
| BPM Property Maintenance & Refurbishment Ltd | Construction | 2023 |
| Bpm-Discipline UK Limited | Professional & scientific | 2012 |
| BR Group Digital Business Ltd | Wholesale & retail | 2025 |
| Bracey Research and Development Ltd | Professional & scientific | 2025 |
| Bradley’S Building Services Ltd | Construction | 2022 |
| Brae Court Properties Limited | Real estate | 2004 |
| Brainchild Education Ltd | Wholesale & retail | 2021 |
| Braintrust Productions Limited | Administrative & support | 2016 |
| Braithwaite Jourdan Limited | Professional & scientific | 2020 |
| Bramley Investments Limited | Real estate | 2023 |
| Brampton Grange Estates Ltd | Construction | 1997 |
| Brand Management Group Limited | Administrative & support | 2024 |
| Brandfusion Limited | Administrative & support | 2001 |
| Branding Theory Limited | Professional & scientific | 2011 |
| Branksome (Weybridge) Residents Association Limited | Households | 1967 |
| Brant Risk Assessment Services Limited | Professional & scientific | 2005 |
| Brave New Capital Limited | Professional & scientific | 2012 |
| Brave New World Marketing Limited | Professional & scientific | 2020 |
| Brayoniconsultancy Ltd | Manufacturing | 2025 |
| Braywick Court (Kingston) Limited | Households | 1986 |
| Break the Grid Limited | Information & communication | 2024 |
| Brecknell Willis Company Limited | Manufacturing | 2025 |
| Brener Ltd | Construction | 2007 |
| Bresswell Investments Limited | Administrative & support | 2017 |
| Bretania Investments Limited | Administrative & support | 2018 |
| Brew & Crust Ltd | Manufacturing | 2026 |
| Brewsmiths Ltd | Hospitality | 2025 |
| Brian Brivati and Associates Limited | Education | 2012 |
| Brickwhips Limited | Wholesale & retail | 2025 |
| Bridge Asset Limited | Administrative & support | 2007 |
| Bridge House (Walton) Residents Management Company Limited | Households | 2018 |
| Bridge Road (Chertsey) Management Company Ltd | Households | 2010 |
| Bridgebooks Global Limited | Professional & scientific | 2025 |
| Bridgewater Residents Limited | Households | 1973 |
| Bright Pine Consulting Limited | Professional & scientific | 2023 |
| Bright Services FZE Ltd | Education | 2023 |
| Bright Sparx UK Ltd | Construction | 2016 |
| Brighter Future Investments Limited | Real estate | 2026 |
| Brighton Soundproofing Limited | Construction | 2015 |
| Brightpass Education Ltd | Education | 2026 |
| Brightside Projects Ltd | Professional & scientific | 2023 |
| Brightstar International Limited | Professional & scientific | 2001 |
| Briglyfire Limited | Professional & scientific | 2013 |
| Brisdane Engineering Company Limited | Wholesale & retail | 2004 |
| Brisla Limited | Other services | 2016 |
| Bristol and Bath Football LLP | | 2023 |
| Britcoin Wallet Ltd | Information & communication | 2021 |
| Britcore Construction Ltd | Construction | 2026 |
| Brittany Services Limited | Hospitality | 2025 |
| Brixton Sonic Ltd | Information & communication | 2013 |
| Broadconglomarate Limited | Professional & scientific | 2026 |
| Broadent Limited | Information & communication | 2024 |
| Broadgate 1960 Company Limited | Financial services | 2017 |
| Broadleaf Consulting Ltd | Professional & scientific | 2023 |
| Broadlight Agency Limited | Professional & scientific | 2022 |
| Broadlight Group Limited | Professional & scientific | 2020 |
| Broadridge Advisory Limited | Professional & scientific | 2025 |
| Broadwater Consulting Limited | Professional & scientific | 2009 |
| Brockhurst Properties Limited | Real estate | 2006 |
| Brodersen International Limited | Extraterritorial | 2003 |
| Broke Hall Ltd | Information & communication | 2007 |
| Brom 1 Ltd | Real estate | 2014 |
| Bronze Otter Ltd | Professional & scientific | 2025 |
| Brook & Sons Limited | Administrative & support | 2021 |
| Brook Infrastructure Ltd | Administrative & support | 2005 |
| Brookair Limited | Professional & scientific | 2026 |
| Broomfield Holdings Ltd | Financial services | 2022 |
| Brown Box Limited | Extraterritorial | 2019 |
| Brown Cat Consulting Ltd | Professional & scientific | 2025 |
| Brown Consulting UK Limited | Professional & scientific | 2008 |
| Brown COW Films Limited | Information & communication | 2001 |
| Brows by Expert Ltd | Other services | 2024 |
| Bruce Associates Ltd | Administrative & support | 2014 |