| Bridgemark & Partners Ltd | Professional & scientific | 2025 |
| Bridgeway Stores Limited | Wholesale & retail | 2015 |
| Brigsand Limited | Administrative & support | 2012 |
| Brilliant Safety Limited | Administrative & support | 2023 |
| Brinton Motor Company Limited | Wholesale & retail | 2021 |
| Brissenden Office Solutions Ltd | Administrative & support | 2018 |
| Britannia Aggregates Limited | Mining & quarrying | 1988 |
| Britannia Crewing Services Limited | Administrative & support | 2013 |
| Britannia Gifts London Ltd | Wholesale & retail | 2019 |
| British Council for Chinese Martial Arts Limited | Education | 2024 |
| Brix Mortgages Limited | Financial services | 2025 |
| Broad Oak Colour Printers Limited | Manufacturing | 1987 |
| Broad Oak Motor Group Limited | Wholesale & retail | 1960 |
| Broad Oak Tyres Limited | Wholesale & retail | 2023 |
| Broadstone Real Estate Limited | Real estate | 2015 |
| Brocklebank Electrical Contractors Limited | Construction | 2011 |
| Brockman & Teesdale Property Ltd | Real estate | 2025 |
| Broken NIB Ltd | Professional & scientific | 2021 |
| Bromley Property Resources Limited | Households | 2003 |
| Brondesbury Property Limited | Construction | 2004 |
| Brook Farm Wingham LLP | | 2013 |
| Brook Investment Partners Limited | Professional & scientific | 2011 |
| Brooke Gallagher Consulting Ltd | Professional & scientific | 2025 |
| Brookminster Limited | Administrative & support | 2011 |
| Brou Limited | Health & social care | 2012 |
| Brown and Adaire Limited | Real estate | 1965 |
| Browns Salon Ltd | Other services | 2019 |
| Browse Buy Repeat Limited | Wholesale & retail | 2021 |
| Bryan Hirst Limited | Water & waste | 2006 |
| Brymore One Management Company Limited | Households | 1986 |
| Bryter Digital Limited | Information & communication | 2013 |
| BS Care Solutions Limited | Health & social care | 2015 |
| BSF Timber Engineering Limited | Extraterritorial | 2014 |
| BSS Enterprises Southern Limited | Construction | 2020 |
| BTP Developments Limited | Construction | 2019 |
| BTS Timber Engineering Limited | Professional & scientific | 2001 |
| BUA Motorsport Ltd | Extraterritorial | 2025 |
| Bubblin Ltd | Wholesale & retail | 2020 |
| Buckels Holdings Limited | Real estate | 2025 |
| Buckle Under Limited | Education | 2014 |
| Budden Consulting Ltd | Arts & recreation | 2021 |
| Buddy Apple Holdings Limited | Financial services | 2025 |
| Buddy Apple Limited | Wholesale & retail | 2025 |
| Buddy's Commercial Limited | Construction | 2025 |
| Buddy's Development Limited | Construction | 2025 |
| Buddy's Property Limited | Construction | 2025 |
| Buddy's Residential Limited | Construction | 2025 |
| Buddy's Retail Park LLP | | 2024 |
| Buddy's Transport Services Limited | Transport & logistics | 2003 |
| Builders Square Residents Association Limited | Professional & scientific | 1983 |
| Buildifine Ltd | Manufacturing | 2025 |
| Building Plastics on Demand Ltd | Wholesale & retail | 2023 |
| Bulat Industries Ltd | Wholesale & retail | 2024 |
| Bunn Electrical Contractors Limited | Construction | 2011 |
| Burgate Express Ltd | Wholesale & retail | 2026 |
| Burgate Kent Limited | Real estate | 2025 |
| Burgate Properties Ltd | Real estate | 2021 |
| Burgess Hodgson 1 Limited | Extraterritorial | 2026 |
| Burgess Hodgson 2 Limited | Extraterritorial | 2026 |
| Burgess Hodgson 2025 LLP | | 2015 |
| Burgess Hodgson 3 Limited | Extraterritorial | 2026 |
| Burgess Hodgson Accounts LLP | | 2022 |
| Burgess Hodgson Audit Limited | Professional & scientific | 2025 |
| Burgess Hodgson Canterbury Limited | Professional & scientific | 1999 |
| Burgess Hodgson Group LLP | | 2022 |
| Burgess Hodgson Limited | Professional & scientific | 2025 |
| Burgess Hodgson Property LLP | | 2022 |
| Burgis & Co Limited | Professional & scientific | 1997 |
| Burren 2010 Limited | Hospitality | 2009 |
| Bursted Hill Stables Ltd | Arts & recreation | 2022 |
| Bursted Manor Livery Limited | Arts & recreation | 1984 |
| Burt's Country Store Ltd | Wholesale & retail | 2018 |
| Buryfield Grange Life Planning Limited | Financial services | 2006 |
| Business Computers Ltd | Extraterritorial | 2025 |
| Buttermarket House Management Company Limited | Households | 2012 |
| Buyers & Builders Limited | Professional & scientific | 2025 |
| Buzzberry Glamping Ltd | Hospitality | 2023 |
| BV Alpha Systems Limited | Financial services | 2020 |
| BVB UK Events Limited | Professional & scientific | 2021 |
| BY Lucy Clark Limited | Professional & scientific | 2025 |
| BY the Board Ltd | Wholesale & retail | 2022 |
| BY the Lighthouse Limited | Households | 2003 |
| BYE Properties Ltd | Real estate | 2025 |
| Byvow Ltd | Wholesale & retail | 2026 |
| Byzantium Consulting Limited | Professional & scientific | 2007 |
| C & H Trading Online Limited | Wholesale & retail | 2019 |
| C G Training Solutions Ltd | Administrative & support | 2011 |
| C H P Builders Limited | Construction | 2018 |
| C J Luckhurst Limited | Extraterritorial | 2001 |
| C P Cases Limited | Manufacturing | 1973 |
| C V M E Truck Refrigeration Limited | Wholesale & retail | 2024 |
| C V M E Truck Services Limited | Administrative & support | 2005 |
| C Vilches Romo Ltd | Professional & scientific | 2018 |
| C&A Taxis Limited | Wholesale & retail | 2022 |
| C. & P. Limited | Real estate | 1970 |
| C.A.L.M. Industries Ltd | Information & communication | 2026 |
| C.M Service 2019 Limited | Construction | 2019 |
| C.W.Lyons & SON (Canterbury) Limited | Other services | 1944 |
| C2R Recycling Ltd | Professional & scientific | 2024 |
| CAB Day&Night Limited | Transport & logistics | 2025 |