| Bekam Services Limited | Transport & logistics | 2025 |
| Belhouse Care Ltd | Health & social care | 2024 |
| Belief Power Limited | Manufacturing | 2024 |
| Bell Windows Limited | Construction | 2010 |
| Bell Zinc & Copper Roofing Limited | Construction | 2008 |
| Bella Nepali Gillingham Ltd | Hospitality | 2026 |
| Bellar Care and Training Ltd | Real estate | 2022 |
| Bellegrove Construction Ltd | Construction | 2019 |
| Bellkenn Communications Ltd | Information & communication | 2012 |
| Bells Lane Management Company Limited | Households | 2011 |
| Belmack Ltd | Other services | 2020 |
| Below and Beyond Ltd | Wholesale & retail | 2025 |
| BEM Logistic Ltd | Transport & logistics | 2025 |
| Benchmark Training Limited | Education | 2005 |
| Bens Solution Limited | Hospitality | 2024 |
| Berengrave Petrol Station Limited | Wholesale & retail | 1963 |
| Berengrave Services Limited | Wholesale & retail | 1972 |
| Bernd Reisch Transport Solutions Ltd | Transport & logistics | 2011 |
| Berrycourt Development Limited | Construction | 2015 |
| Berrylicious - Cakes by Jacqui Ltd | Manufacturing | 2019 |
| Berthr Limited | Information & communication | 2019 |
| Bespoke Sparks Ltd | Construction | 2024 |
| Best Curry Gillingham Ltd | Hospitality | 2026 |
| Best Fittings (UK) Ltd | Manufacturing | 2008 |
| Best Fittings Ltd | Wholesale & retail | 2003 |
| Best Home Supplies Co., Limited | Wholesale & retail | 2024 |
| Best Motors 4 YOU Ltd | Wholesale & retail | 2020 |
| Best Prestige Cars Ltd | Wholesale & retail | 2025 |
| Best Steel Group (Shandong) Co., Ltd | Manufacturing | 2023 |
| Best Supermarket Limited | Wholesale & retail | 2016 |
| Best Town Pizza Ltd | Hospitality | 2022 |
| Bestbade Ltd | Wholesale & retail | 2018 |
| Bestbuy Industry Ltd | Manufacturing | 2021 |
| Betgiant Limited | Information & communication | 2025 |
| Beth COX Beauty Limited | Other services | 2024 |
| Better International Industrial Limited | Manufacturing | 2024 |
| Better Living Landscapes Ltd | Administrative & support | 2023 |
| Better Rolling Limited | Wholesale & retail | 2023 |
| Beulah Christian Fellowship | Other services | 2012 |
| Bevan Electrical and Security Ltd | Construction | 2024 |
| Beyond Healthcare Limited | Health & social care | 2025 |
| BGC Services Ltd | Construction | 2025 |
| BGI Capital Investment Ltd | Real estate | 2025 |
| BGM Transport Ltd | Transport & logistics | 2019 |
| BH Bazar Distributors Ltd | Wholesale & retail | 2025 |
| BHA Bookkeeping Services Limited | Professional & scientific | 2019 |
| Bhat Consulting Limited | Health & social care | 2015 |
| BHL Heating Hub Ltd | Construction | 2024 |
| Bialyn Ltd | Hospitality | 2023 |
| BID Works Limited | Administrative & support | 2025 |
| Biddiscombe & SON Plumbing & Heating Ltd | Construction | 2013 |
| Big Boss & Sons Construction Limited | Construction | 2019 |
| Big C Courier Services Ltd | Transport & logistics | 2026 |
| Big Car Finance Limited | Wholesale & retail | 2023 |
| Big Electrical Solutions Ltd | Construction | 2022 |
| Big Green Self Storage Ltd | Transport & logistics | 2007 |
| Big Mum's House Limited | Hospitality | 2018 |
| Big Panda Lighting Ltd | Professional & scientific | 2026 |
| Bigbear Consultancy Ltd | Information & communication | 2014 |
| Bijyou Ltd | Real estate | 2024 |
| BIL Technologies Ltd | Information & communication | 2012 |
| Binzhou Ziyu New Material Co., Ltd | Manufacturing | 2023 |
| BIOCLEAN121 Ltd | Water & waste | 2024 |
| Biocool Energy Limited | Construction | 2026 |
| Bioheat Energy Limited | Construction | 2015 |
| Biryani and Curry House Ltd | Hospitality | 2025 |
| Bischem Limited | Health & social care | 2002 |
| Bischoff (Holdings) Limited | Financial services | 2019 |
| Bithoms Support Services Ltd | Health & social care | 2019 |
| Biyrot Ltd | Professional & scientific | 2013 |
| BK Clothing Supply Ltd | Wholesale & retail | 2026 |
| BK Electrical Solutions Ltd | Construction | 2025 |
| Bkpb Civil Engineering Limited | Construction | 2020 |
| Black ARK Medical Services Ltd | Health & social care | 2020 |
| Black Co-Op CIC | Professional & scientific | 2025 |
| Black Horse Farm Limited | Real estate | 2010 |
| Black Lion MOT Centre Limited | Wholesale & retail | 2014 |
| Black PIG Retreats Ltd | Hospitality | 2016 |
| Black Rock Demolition Ltd | Construction | 2024 |
| Blackdoll Limited | Information & communication | 2022 |
| Blackdune Limited | Real estate | 2003 |
| Blackspark FAB & Fitters Ltd | Construction | 2026 |
| Blackstone Property Limited | Construction | 2012 |
| Blackstream Consulting Ltd | Professional & scientific | 2007 |
| Bladeartisan Limited | Wholesale & retail | 2024 |
| Blakedew 194 Limited | Extraterritorial | 1999 |
| Blaszczyk Limited | Transport & logistics | 2014 |
| Blessed Root Ltd | Real estate | 2021 |
| Blimi Services Ltd | Construction | 2020 |
| Bling Group Co., Limited | Wholesale & retail | 2024 |
| Blockchase Ltd | Professional & scientific | 2019 |
| Bloody Mary's Limited | Hospitality | 2015 |
| Bloomfield and Associates Ltd | Financial services | 2005 |
| Bloomfield Group Holdings Ltd | Financial services | 2024 |
| Bloomy Home Ltd | Wholesale & retail | 2025 |
| BLU Electrical Installations Limited | Construction | 2010 |
| Blue 10 Installations Limited | Construction | 2016 |
| Blue Apple Medical Services Limited | Health & social care | 2014 |
| Blue Bubble Media Ltd | Information & communication | 2023 |
| Blue Diamonds Drylinning Services Ltd | Construction | 2018 |