| Budget Accountants Ltd | Professional & scientific | 2019 |
| Budget Medical Ltd | Wholesale & retail | 2010 |
| Buds Doggy Day Care Ltd | Other services | 2021 |
| Build & Roofing Solutions Limited | Construction | 2017 |
| Buildaroo Ltd | Construction | 2022 |
| Buildegra Limited | Construction | 2021 |
| Builders Club London Limited | Arts & recreation | 2013 |
| Building Automation Specialists Limited | Construction | 2019 |
| Building Automation Systems Limited | Construction | 2024 |
| Building Design Studio Ltd | Professional & scientific | 2009 |
| Building Eco Systems Limited | Professional & scientific | 2010 |
| Building Solutions (Ashford) Ltd | Construction | 2026 |
| Buildit Group Ltd | Construction | 2010 |
| Buildsuite Limited | Information & communication | 2025 |
| Built Physics Limited | Professional & scientific | 2012 |
| Built Training Limited | Arts & recreation | 2021 |
| Bulcan Ltd | Real estate | 2024 |
| Bulk Trans (Kent) Ltd | Transport & logistics | 2017 |
| Bull Trading Limited | Wholesale & retail | 2012 |
| Bullenfield Ltd | Transport & logistics | 2017 |
| Bullish Apex Limited | Wholesale & retail | 2024 |
| Bullockstone Farm Maintenance Limited | Other services | 2021 |
| Bullseye School of Motoring Ltd | Education | 2009 |
| Buluty Ltd | Construction | 2020 |
| Bungle Properties Limited | Real estate | 2025 |
| Burd Property Management Ltd | Real estate | 2023 |
| Burdell Consulting Limited | Professional & scientific | 2014 |
| Burden's UK Holdings Limited | Financial services | 2025 |
| Burgate Investments Limited | Construction | 2008 |
| Burge Ltd | Professional & scientific | 2020 |
| Burger Boys Ashford Ltd | Hospitality | 2022 |
| Burgess Fields Management Company Limited | Administrative & support | 2017 |
| Burgess Property Ltd | Real estate | 2018 |
| Burnell & Jones Ltd. | Construction | 2019 |
| Burnham Imperial Ltd | Hospitality | 2025 |
| Burnt Oak Book Keeping Limited | Professional & scientific | 2003 |
| Burravoe Limited | Administrative & support | 1965 |
| Burrow Plant & Engineering Ltd | Manufacturing | 2016 |
| Burrows Survey Services Ltd | Construction | 2021 |
| Burton Family Properties Ltd | Real estate | 2023 |
| Burton Spice Ashford Ltd | Hospitality | 2021 |
| Burwood Developments Limited | Construction | 1999 |
| Bushell's Fresh Beef Limited | Wholesale & retail | 1985 |
| Business and Brands Ltd | Wholesale & retail | 2021 |
| Business Financial Solutions Ltd | Professional & scientific | 2015 |
| Business Legacy Limited | Hospitality | 2010 |
| Business Travel Association Limited | Other services | 1987 |
| Buss Business Management Ltd | Administrative & support | 2023 |
| Busta Grimez Ltd. | Administrative & support | 2021 |
| Buster Business Ventures Limited | Professional & scientific | 2011 |
| Butler & Miles Construction Limited | Construction | 2005 |
| Butler Harwell Limited | Administrative & support | 2018 |
| Butler Skips Limited | Water & waste | 2022 |
| Buttercup Enterprises Limited | Agriculture & fishing | 2010 |
| Butterflies Day Care and PRE School Limited | Health & social care | 2024 |
| Buyandship UK Limited | Transport & logistics | 2019 |
| Buyfolds.Com Ltd | Wholesale & retail | 2019 |
| BVG Property Services Limited | Construction | 2011 |
| BWH Consulting Ltd | Professional & scientific | 2024 |
| Bwscaffolding Ltd | Construction | 2025 |
| BY Abigail Scarfe Ltd | Professional & scientific | 2023 |
| BY Launeden Ltd | Professional & scientific | 2026 |
| Bybrook Court Management Company Limited | Households | 1982 |
| Bybrook Services Limited | Wholesale & retail | 1975 |
| Byford Roofing Contractors Limited | Construction | 2017 |
| Byford Truckworks Ltd | Wholesale & retail | 2026 |
| Bypest Environmental Services Limited | Other services | 2008 |
| Bytnar Ltd | Professional & scientific | 2017 |
| Bytnar-Plastic Ltd | Manufacturing | 2020 |
| C & a Construction South East Ltd | Construction | 2023 |
| C & C Homes South East Limited | Construction | 2025 |
| C & I Carpentry Ltd | Construction | 2018 |
| C & L Tierney Limited | Education | 2019 |
| C & M Carpentry South East Limited | Construction | 2009 |
| C & P Renovations Limited | Construction | 2007 |
| C & S Kitchens Limited | Manufacturing | 2000 |
| C a Hemsley Limited | Information & communication | 2017 |
| C and C Pattinson Limited | Arts & recreation | 2023 |
| C G Hundal Construction Ltd | Construction | 2019 |
| C H Smart Cleaning Solutions Ltd | Administrative & support | 2019 |
| C I Alliance Limited | Financial services | 2023 |
| C J E Construction Limited | Construction | 2018 |
| C J Financial Kent Ltd | Financial services | 2012 |
| C J Mcdonald Builders Ltd | Real estate | 2019 |
| C J O'Shea Carpentry Ltd | Construction | 2017 |
| C J S Solutions & Support Ltd | Real estate | 2009 |
| C L O’Sullivan Construction Ltd | Construction | 2023 |
| C M Garden Services Ltd | Administrative & support | 2020 |
| C M Logistics Ltd | Transport & logistics | 2012 |
| C M Mepham Limited | Agriculture & fishing | 2003 |
| C M Property Holdings & Management Ltd | Real estate | 2020 |
| C P K Consulting Limited | Information & communication | 2005 |
| C Rada HCW Ltd | Other services | 2015 |
| C S Transport (London) Ltd | Transport & logistics | 2021 |
| C Tomlin Developments Limited | Construction | 2011 |
| C Woodcock Trading Ltd | Wholesale & retail | 2025 |
| C Zero Three Contracting Limited | Professional & scientific | 2024 |
| C&C Rend Systems Ltd | Construction | 2022 |
| C&D Roofing Solutions Ltd | Construction | 2026 |
| C&K Clearance Limited | Administrative & support | 2014 |