| Bluewood Trading Ltd | Financial services | 2020 |
| Bluntswall Ltd | Information & communication | 1994 |
| Bmedia Consultancy Ltd | Professional & scientific | 2022 |
| BML Design Rooms Limited | Professional & scientific | 2011 |
| BMS CAD & Graphic Innovations Limited | Professional & scientific | 2016 |
| BNK Export Company Limited | Wholesale & retail | 2021 |
| Bnsi Electrical Contractors Ltd | Extraterritorial | 2022 |
| Boakes Meadow Residents Company Limited | Households | 1967 |
| BOB Peters TC Limited | Administrative & support | 2016 |
| Bobeka Limited | Manufacturing | 2022 |
| BOD & TED Limited | Wholesale & retail | 2009 |
| BOD Pharma & Testing Limited | Wholesale & retail | 2018 |
| Bodiwork by Devey Limited | Administrative & support | 2009 |
| Boffe Ltd | Manufacturing | 2017 |
| Bojangles Coffee House Sevenoaks Ltd | Hospitality | 2026 |
| Bold Fitting & Joinery Ltd | Construction | 2025 |
| Bolneys Wood (2000) Limited | Extraterritorial | 2022 |
| Boltonbob Limited | Real estate | 2025 |
| BON Marche Mews Management Company Limited | Real estate | 2014 |
| Bond Stone Cleaning Ltd | Administrative & support | 2019 |
| Bonhill (Crouch) Limited | Construction | 2020 |
| Bonzer Group Limited | Information & communication | 2024 |
| Boobiemilk Ltd | Health & social care | 2011 |
| Booker Labs Ltd | Information & communication | 2026 |
| Booker Wang Holdings Ltd | Financial services | 2026 |
| Bookkeeping Matters Ltd | Professional & scientific | 2026 |
| Boost Communications Ltd | Professional & scientific | 2025 |
| Bordeaux Wine Investments Limited | Wholesale & retail | 1998 |
| Boro Market Ltd | Agriculture & fishing | 2021 |
| Borough Green Cars Ltd | Transport & logistics | 2019 |
| Borough Green Garage Ltd | Wholesale & retail | 2018 |
| Borough Green Manufacturing Limited | Professional & scientific | 1996 |
| Borough Green Tyres Ltd | Wholesale & retail | 2015 |
| Bottanical Ltd | Administrative & support | 2018 |
| Bottle Field Investments Limited | Financial services | 2026 |
| Boundaries Road Management Company Limited | Real estate | 2014 |
| Bourne Place Estate Management Company Limited | Households | 2000 |
| Bowcroft Properties Limited | Construction | 2006 |
| Bowden Court Management Company Limited | Real estate | 2009 |
| Bowieland Ltd | Information & communication | 2024 |
| Box Logistics & Warehousing Limited | Administrative & support | 2024 |
| Boxed Hope Ltd | Health & social care | 2021 |
| Boxology Solutions Limited | Professional & scientific | 2025 |
| Boxtop Properties Limited | Financial services | 2002 |
| Boyett Clark Ltd | Real estate | 2016 |
| Bozec International Ltd | Professional & scientific | 2012 |
| BP Décor Ltd | Construction | 2023 |
| BPA Piano Actions Ltd | Other services | 2019 |
| BPM Cleaning and Maintenance Ltd | Extraterritorial | 2021 |
| BPM Property Maintenance Ltd | Other services | 2009 |
| BR7 Fish Bar Ltd | Hospitality | 2023 |
| Braavos Holdings Limited | Financial services | 2025 |
| Braeside Investments Limited | Administrative & support | 2003 |
| Brain AID International Ltd | Administrative & support | 2021 |
| Brain Rover Velar Ltd | Real estate | 2025 |
| Braintree Limited | Professional & scientific | 2013 |
| Bramley Capital Ltd | Extraterritorial | 2018 |
| Bramley of England Tea Co Limited | Extraterritorial | 2013 |
| Branbridges Leisure Limited | Arts & recreation | 2021 |
| Branches of Opportunity Ltd | Other services | 2025 |
| Brand Deployment Management Services Limited | Professional & scientific | 2020 |
| Branded Two Limited | Hospitality | 2017 |
| Brandise Communication Limited | Professional & scientific | 2014 |
| Brandrisks Group Limited | Extraterritorial | 2005 |
| Brandrisks Limited | Extraterritorial | 2005 |
| Brandvale Properties Ltd | Real estate | 1998 |
| Braniff Management Services Ltd | Construction | 2019 |
| Bread & Butter London Limited | Financial services | 2016 |
| Break the Chains Media Ltd | Professional & scientific | 2025 |
| Breakaway Travel Limited | Administrative & support | 2003 |
| Breckfast Ltd. | Information & communication | 2015 |
| Breen Plumbing and Heating Ltd | Construction | 2017 |
| Breezeline International Group Limited | Administrative & support | 2013 |
| Breiz Technologies Limited | Information & communication | 2011 |
| Brian H Day Limited | Financial services | 1951 |
| Bribell Bridge Ltd | Professional & scientific | 2017 |
| Brickfield Meadows Management Company Limited | Households | 2007 |
| Brickstone Partners Chatham Ltd | Real estate | 2021 |
| Brickstone Partners SPV 1 Ltd | Real estate | 2017 |
| Brickstone Partners SPV Ltd | Real estate | 2019 |
| Brickstone Sevenoaks Ltd | Real estate | 2024 |
| Brides Dress Revisited Limited | Wholesale & retail | 2009 |
| Bridge Media Productions Ltd | Manufacturing | 2010 |
| Brido Digital Limited | Professional & scientific | 2026 |
| Bright and True Ltd | Hospitality | 2020 |
| Bright Young Things Limited | Administrative & support | 2026 |
| Brighter Starts Learning Tree Ltd | Wholesale & retail | 2012 |
| Brighthouse Builders Limited | Construction | 2026 |
| Brightland Properties Limited | Construction | 2007 |
| Brightside Group Limited | Financial services | 2006 |
| Brightside Insurance Services Limited | Financial services | 2001 |
| Brightstart Preschool Limited | Education | 2021 |
| Brilliance SA Limited | Real estate | 2017 |
| Brimbo Qa/Qc Consultants Ltd. | Construction | 2013 |
| Brindle Evolutions Limited | Real estate | 2017 |
| Brindle Solutions Ltd | Information & communication | 2016 |
| BRIP0319 (Tonbridge) LLP | | 2020 |
| Brit for Events Limited | Professional & scientific | 2012 |
| Britannia Garage Doors Ltd | Wholesale & retail | 2023 |
| Brith Holdings Ltd | Financial services | 2022 |