| Broadreach Homes Limited | Real estate | 2019 |
| Broadventure UK Limited | Wholesale & retail | 2010 |
| Broadway Assets (Kent) Ltd | Administrative & support | 2022 |
| Broadway Local Ltd | Wholesale & retail | 2024 |
| Broken Biscuits Bakery Ltd | Hospitality | 2025 |
| Bromley Training and Assessment Centre LLP | | 2009 |
| Bronze Compass Ltd | Information & communication | 2026 |
| Brooklands Estate (Kent) Company Limited | Professional & scientific | 1999 |
| Broomfield Investments Limited | Other services | 2015 |
| Brothers Grup Limited | Manufacturing | 2021 |
| Broughton Building Services Limited | Construction | 2021 |
| Broughton Work Solutions Ltd | Manufacturing | 2026 |
| Brown and Mason Group Limited | Construction | 1985 |
| Brown's Cargo (Europe) Limited | Transport & logistics | 1982 |
| Browns of Dartford Limited | Wholesale & retail | 2005 |
| BRP Estates Ltd | Real estate | 2024 |
| Brunel Consultancy Ltd | Professional & scientific | 2023 |
| BSB Automotive Limited | Wholesale & retail | 2020 |
| Bsdaniells Ltd | Professional & scientific | 2025 |
| BSH Group Limited | Hospitality | 2025 |
| BSP Autotech Ltd | Wholesale & retail | 2021 |
| BTL Consulting Services Ltd | Professional & scientific | 2024 |
| Bubble Bubble Ltd | Hospitality | 2025 |
| Bubblegum Cases Ltd | Wholesale & retail | 2016 |
| Bubblestone Construction Services Limited | Professional & scientific | 2024 |
| Bubo Art Limited | Manufacturing | 2020 |
| Budak Real Estate Ltd | Real estate | 2026 |
| Budding Gems Ltd | Education | 2020 |
| Budget Video Production Ltd | Information & communication | 2020 |
| Budushcheye Investments Ltd | Real estate | 2019 |
| Build IT Global Limited | Information & communication | 2025 |
| Builder Martin Decking Ltd | Construction | 2023 |
| Building Solutions Unique Ltd | Construction | 2014 |
| Buildkent (SE) Ltd | Construction | 2018 |
| Buildkent Limited | Construction | 2016 |
| Buildright Improvements Limited | Construction | 2015 |
| Buildright NW Ltd | Construction | 2018 |
| Builds by Bishop Ltd | Construction | 2024 |
| Built by Designs Limited | Construction | 2013 |
| Built Environment Certifications Ltd | Other services | 2026 |
| Bukis Ltd | Construction | 2008 |
| Bulasch Ltd | Wholesale & retail | 2026 |
| Bull Air Installation Ltd | Construction | 2022 |
| Bull Care Services Ltd | Health & social care | 2022 |
| Bull Media Ltd | Hospitality | 2015 |
| Bulla Ventilation Ltd | Construction | 2017 |
| Bulldog Builders & Maintenance Ltd | Construction | 2025 |
| Bulldog Transport Ltd | Transport & logistics | 2026 |
| Bumblebee Early Years CIC | Information & communication | 2026 |
| Bunker and Beehive Limited | Real estate | 2018 |
| Burger Catering Ltd | Hospitality | 2022 |
| Burnell Controls (Kent) Limited | Manufacturing | 1973 |
| Burnell Industrial Services Limited | Manufacturing | 1989 |
| Burnett Pictures Ltd | Information & communication | 2026 |
| Burroughs Ltd | Administrative & support | 2022 |
| BUS Town Ltd | Hospitality | 2025 |
| Business Cleaners Limited | Professional & scientific | 2010 |
| Business Solutions Art Ltd | Professional & scientific | 2015 |
| Business Tentacles Ltd | Information & communication | 2014 |
| Busy BEE Baked Fruit Tea Ltd | Manufacturing | 2021 |
| Busy BEE Landscapes (SE and Surrounding Areas) Ltd | Administrative & support | 2026 |
| Busybee Assistant Ltd | Professional & scientific | 2020 |
| BUT Bunnies Ltd | Information & communication | 2025 |
| Butler & Mitchell Roofing Ltd | Construction | 2025 |
| Buyeat Ltd | Hospitality | 2018 |
| Buzzing BEE Ltd | Hospitality | 2019 |
| BVL Ltd | Transport & logistics | 2026 |
| BVL Scaffolding Co. Limited | Construction | 2011 |
| BW Air Conditioning Services Ltd | Construction | 2026 |
| BW Corporate Trading Co Ltd | Wholesale & retail | 2019 |
| BW Developments (Kent) Ltd | Construction | 2024 |
| BW Homes Limited | Real estate | 2018 |
| BWC Fire Limited | Professional & scientific | 2011 |
| BWC Haulage Limited | Transport & logistics | 2017 |
| Bxzqn Limited | Information & communication | 2024 |
| BY Catering Ltd | Hospitality | 2025 |
| BY T'S Ventures Ltd | Professional & scientific | 2025 |
| Byatt Electrical Limited | Construction | 2008 |
| Bybels Ltd | Other services | 2025 |
| Bylor Services Limited | Construction | 2016 |
| Bytecode Consulting Ltd | Information & communication | 2026 |
| Bytesource Ltd | Information & communication | 2024 |
| Bytewell Solutions Ltd | Information & communication | 2025 |
| Byteworld Solutions Ltd | Information & communication | 2025 |
| Byzgen Limited | Information & communication | 2017 |
| C & D Properties Limited | Real estate | 2005 |
| C 5 Electrical Limited | Construction | 2013 |
| C and C Electrical Contractors Limited | Construction | 2007 |
| C and C Hire Ltd | Transport & logistics | 2019 |
| C and K Chiken Chips Limited | Wholesale & retail | 2026 |
| C and N Designs Ltd | Manufacturing | 2017 |
| C and P Maintenance Contractors Ltd | Construction | 2026 |
| C Bicknell Electrical Services Ltd | Construction | 2014 |
| C Cubed Media Limited | Professional & scientific | 2024 |
| C D K Installations Ltd | Construction | 2019 |
| C D K Maintenance Ltd | Construction | 2026 |
| C Ginn Building Restoration Limited | Construction | 2007 |
| C Humphrey Consulting Ltd | Administrative & support | 2024 |
| C K R | | 2004 |
| C London Plumbing & Heating Ltd | Construction | 2019 |