| Birch Tree Care (South East) Ltd | Agriculture & fishing | 2019 |
| Birchington Auto Repairs Limited | Wholesale & retail | 2007 |
| Birchington Brides Ltd | Wholesale & retail | 2012 |
| Birchington Suit Hire Ltd | Wholesale & retail | 2012 |
| Bish Bosh Wash Ltd | Administrative & support | 2023 |
| BJ Neeves Property Investment Company Limited | Real estate | 2023 |
| Black Cat Cafe/ Bar Ltd | Other services | 2016 |
| Black Contract Flooring Ltd | Construction | 2020 |
| Black FIN Investments (UK) Limited | Financial services | 2016 |
| Black Pearl Limited | Administrative & support | 2005 |
| Blackwall Property (NO.1) Limited | Real estate | 2018 |
| Blackwall Property (NO.2) Limited | Real estate | 2018 |
| Blackwall Property (NO.3) Limited | Real estate | 2022 |
| Blackwall Property Group Limited | Real estate | 2016 |
| Blakeshall Limited | Administrative & support | 2004 |
| Blanchard Investments Ltd | Real estate | 2026 |
| Blanchards Holdings Ltd | Financial services | 2025 |
| Blanchards Inheritance Ltd | Professional & scientific | 2018 |
| Blarecast Systems Limited | Information & communication | 2020 |
| BLM Ltd | Real estate | 2026 |
| Block Brewery Limited | Manufacturing | 2015 |
| Bloodbridge Electrical Ltd | Construction | 2026 |
| Bloomblush Homes Ltd | Real estate | 2025 |
| Bloomblush Ltd | Wholesale & retail | 2024 |
| Blue Dog Investments Ltd | Construction | 2018 |
| Blue Grey Properties Ltd | Construction | 2018 |
| Blue Harbour Care Ltd | Health & social care | 2026 |
| Blueberry (Pierremont) LLP | | 2007 |
| Blueberry Construction (Ramsgate) Limited | Construction | 2020 |
| Blueberry Developments Estates Limited | Water & waste | 2010 |
| Blueberry Regeneration (Canterbury) Limited | Construction | 2021 |
| Blueberry Regeneration (Gillingham) Ltd | Construction | 2023 |
| Blueberry Regeneration Ltd | Water & waste | 2019 |
| Bluelift Ltd | Wholesale & retail | 2025 |
| Blueline Building Contractors Limited | Construction | 2026 |
| Blueline Racing Limited | Wholesale & retail | 2026 |
| Bluntbydesign Ltd | Construction | 2022 |
| BM Entertainment (Margate) Limited | Wholesale & retail | 2024 |
| BMM Alliances Ltd | Professional & scientific | 2016 |
| Bobiteam Ltd | Transport & logistics | 2024 |
| Boden Floors Ltd | Construction | 2025 |
| Bodrum Ramsgate Ltd | Hospitality | 2025 |
| Bodypure.Io Ltd | Wholesale & retail | 2019 |
| Bodysym Limited | Health & social care | 2017 |
| Boedromion Limited | Professional & scientific | 2004 |
| Bogdas Fish & Chips Ltd | Hospitality | 2018 |
| Bombay Spice Ramsgate Limited | Hospitality | 2018 |
| Bombo Doughnuts Ltd | Manufacturing | 2023 |
| Booths Accountancy Limited | Professional & scientific | 2015 |
| Botany Court Ltd | Construction | 2014 |
| Bottlebrush Ferments Ltd | Wholesale & retail | 2022 |
| Boutique Weddings Kent Limited | Hospitality | 2023 |
| Bowden Digitec Ltd | Other services | 2012 |
| Bowden Property Solutions Limited | Real estate | 2017 |
| Bowditch & Thomas Ltd | Real estate | 2025 |
| Bowen Court Management Company Limited | Households | 1986 |
| Bowman’S Maintenance Contracts Ltd | Wholesale & retail | 2023 |
| Boxed UP Storage Ltd | Transport & logistics | 2017 |
| Boxlink Electrical Ltd | Construction | 2014 |
| BPS Contracts Ltd | Construction | 2021 |
| BPS Services ( Kent ) Ltd | Water & waste | 2021 |
| BR Groundworks Ltd | Construction | 2024 |
| Bra-Tra Ltd | Manufacturing | 2016 |
| Brace Group Ltd | Households | 2025 |
| Brandonben Limited | Administrative & support | 2016 |
| Brandram Properties Limited | Real estate | 2014 |
| Breadsafe Ltd | Other services | 2025 |
| Brecon Bookings Limited | Administrative & support | 2022 |
| Brennan’S Signalling Limited | Construction | 2018 |
| Brera Consulting Limited | Administrative & support | 2016 |
| Brett Scott Roofing Ltd | Construction | 2022 |
| Breuer & Dawson Archive Limited | Wholesale & retail | 2014 |
| Brewstream Limited | Wholesale & retail | 2016 |
| BRI5LLS Developments Ltd | Real estate | 2021 |
| Brian Roberts Construction Ltd | Construction | 2021 |
| Brickwork Heritage Ltd | Construction | 2026 |
| Bridges Insurance Brokers Limited | Financial services | 1972 |
| Bright New Things London Limited | Professional & scientific | 2020 |
| Brighter Futures Care Ltd | Health & social care | 2018 |
| Brindle and Whyte Limited | Manufacturing | 2014 |
| Britannia Logistics and Management Ltd | Transport & logistics | 2026 |
| Brixton Barber Ltd | Real estate | 2014 |
| Broadoak Bespoke Projects Limited | Real estate | 1983 |
| Broadoak Developments Limited | Construction | 2011 |
| Broadoak Heritage Ltd | Construction | 2021 |
| Broadoak Sarre Limited | Education | 2011 |
| Broadstairs Accident Repairs Limited | Wholesale & retail | 2010 |
| Broadstairs Electrical Ltd | Construction | 2023 |
| Broadstairs GAS Services Ltd | Construction | 2016 |
| Broadway GAS Services Ltd | Energy | 2011 |
| Bronwen Limited | Information & communication | 2024 |
| Brook Lodge (Deal) Limited | Health & social care | 2017 |
| Brooklands Residents Limited | Households | 1994 |
| Brooks Automotive Services Ltd | Wholesale & retail | 2025 |
| Bruntwood Holdings Limited | Financial services | 2024 |
| Bubble House Limited | Professional & scientific | 2006 |
| Built to Lead Ltd | Professional & scientific | 2025 |
| Bumble Beez Ltd | Arts & recreation | 2012 |
| Burito FUN Ltd | Hospitality | 2022 |
| Burnout Prevention & Recovery Ltd | Information & communication | 2025 |