| Bizz Corp Capital Ltd | Financial services | 2025 |
| Bizzy Bites 2 Go Ltd | Hospitality | 2025 |
| BJ Developments Limited | Construction | 2008 |
| BJM Engineering & Mechanics Ltd | Construction | 2021 |
| BJM Property Development Ltd | Real estate | 2022 |
| BK Giles Group Ltd | Wholesale & retail | 2025 |
| BKB Trading Ltd | Hospitality | 2022 |
| Blem Information Management Limited | Information & communication | 1987 |
| Blissett Construction Ltd | Construction | 2025 |
| Blitz Away Ltd | Administrative & support | 2025 |
| Bloodline Estates Ltd | Real estate | 2025 |
| Bloomfields @ Ltd | Wholesale & retail | 2024 |
| Blossom Accounts Ltd | Professional & scientific | 2025 |
| Blue Feather Projects Ltd | Professional & scientific | 2019 |
| Blue House Independent Estate Agents Limited | Real estate | 2025 |
| Blue Monkey SE Ltd | Transport & logistics | 2017 |
| Blue Ocean Diving Limited | Wholesale & retail | 2001 |
| Bluestone Microwave Technology Limited | Wholesale & retail | 2001 |
| Bluskyelites Limited | Administrative & support | 2020 |
| BM Plant Hire Limited | Construction | 2016 |
| BM Services Lancashire Ltd | Health & social care | 2021 |
| BN Installations Ltd | Professional & scientific | 2023 |
| Boba Tigers Sushi & Bubble Tea Margate Ltd | Hospitality | 2024 |
| Body Harmony Limited | Other services | 2025 |
| Bolo Kicks Limited | Wholesale & retail | 2023 |
| BON Volks CIC | Arts & recreation | 2015 |
| Boomoosey Limited | Real estate | 2018 |
| Boris Square Co. Ltd | Professional & scientific | 2022 |
| Bottega Bodega Ltd | Wholesale & retail | 2024 |
| Boux Luxe Edgware Co Ltd | Other services | 2024 |
| Bowditch Group Limited | Wholesale & retail | 2025 |
| Bowl Island Limited | Hospitality | 2021 |
| Boxkite Models Ltd | Manufacturing | 2025 |
| Boyden Aquatics Ltd | Agriculture & fishing | 2021 |
| Boys and Maughan LLP | | 2020 |
| BP Management Consultancy Ltd | Administrative & support | 2020 |
| BP Portfolio Management Ltd | Real estate | 2023 |
| BR Power Holding Limited | Financial services | 2023 |
| Bradford Carpentry Limited | Manufacturing | 2023 |
| Branching OUT Tree Surgery (Kent) Limited | Agriculture & fishing | 2008 |
| Braver Scaffolding Limited | Construction | 2025 |
| Bread & Roses C.I.C. | Wholesale & retail | 2011 |
| Bread & Roses Kent CIC | Wholesale & retail | 2023 |
| Breaking the Cycle Community Interest Company | Extraterritorial | 2017 |
| Brede Estates Limited | Administrative & support | 2017 |
| Brede Hotels Limited | Administrative & support | 2016 |
| Brenro Groundworks and Construction Ltd | Construction | 2025 |
| Brickdust Ltd | Arts & recreation | 2018 |
| Brielaviva Ltd | Health & social care | 2019 |
| Brighter Days Markets CIC | Arts & recreation | 2024 |
| Brightside Publishing Ltd | Information & communication | 2020 |
| Brightstartthanet Limited | Education | 2020 |
| Britbev Group Limited | Manufacturing | 2025 |
| British Juggling CIC | Financial services | 2025 |
| Broaden & Build Ltd | Construction | 2026 |
| Broadstairs Bathroom Solutions Limited | Construction | 2014 |
| Brooker & Sons Roofing Limited | Construction | 2012 |
| Brooklyn & Bleart 2 Ltd | Real estate | 2026 |
| Brooklyn & Bleart Ltd | Real estate | 2024 |
| Brooklyn Reshan Ltd | Real estate | 2022 |
| Brow Luxe Co Ltd | Other services | 2024 |
| Broxle Ltd | Wholesale & retail | 2021 |
| BRP Property 1 Ltd | Real estate | 2022 |
| BRP Property 2 Ltd | Real estate | 2022 |
| BRP Property Ltd | Real estate | 2022 |
| BSG Civils Ltd | Administrative & support | 2017 |
| BSP Roofing Limited | Construction | 2018 |
| BST Homes Ltd | Real estate | 2016 |
| BT Homes Ltd | Real estate | 2020 |
| Build a Bizz Ltd | Wholesale & retail | 2025 |
| Build a Burger Franchise Limited | Professional & scientific | 2020 |
| Build Direct Kent Limited | Construction | 2021 |
| Build South East Limited | Construction | 2011 |
| Building & Maintenance Kent Ltd | Construction | 2026 |
| Building Plastics Kent Ltd | Wholesale & retail | 2026 |
| Building Solutions (Kent) Limited | Wholesale & retail | 2022 |
| Bulky Seller Ltd | Other services | 2025 |
| Buoy and Oyster Ltd | Hospitality | 2016 |
| Burgas Fish Bar Ltd | Hospitality | 2025 |
| Burger and Pizza Tonight Ltd | Hospitality | 2025 |
| Business Admin SOS Limited | Administrative & support | 2019 |
| Business Help for Healthcare Limited | Professional & scientific | 2017 |
| Butterfly 6 Studio Ltd | Professional & scientific | 2024 |
| Buzz Bugg Electrical Services Ltd | Construction | 2021 |
| BWM Management & Consultancy Limited | Professional & scientific | 2023 |
| BY Stuart Ltd. | Hospitality | 2017 |
| Bystar Ltd | Households | 2024 |
| C & D Carpentry Kent Ltd | Manufacturing | 2018 |
| C & D Engineering Ltd | Construction | 2019 |
| C & R Steel Fabrications Limited | Construction | 2019 |
| C & S Sweets Ltd | Wholesale & retail | 2024 |
| C R I Manufacturing Limited | Construction | 2003 |
| C.R.Bryant Painter and Decorator Ltd | Construction | 2023 |
| C.Smith & Daughter Limited | Other services | 2023 |
| CA Carpentry Services Limited | Construction | 2022 |
| CA Electrical Ltd | Construction | 2016 |
| CA Investments Kent Ltd | Professional & scientific | 2026 |
| CA Steel Surveying Limited | Professional & scientific | 2009 |
| Cable Coffee Tech Ltd | Manufacturing | 2021 |
| Cadence and Tone Ltd | Information & communication | 2012 |