| Bishnupriya Manipuri Organisation UK CIC | Education | 2024 |
| Bishops Court (Rochester) Management Limited | Households | 1996 |
| BIT Boutique Software Ltd | Information & communication | 2024 |
| Bitmatters Limited | Information & communication | 2018 |
| BIZ Property Services Ltd | Construction | 2021 |
| Bizpal Limited | Administrative & support | 2019 |
| BJ Cosmetics Ltd | Wholesale & retail | 2023 |
| BJD Investments Ltd | Financial services | 2019 |
| BJF Accounting Services Ltd | Professional & scientific | 2018 |
| BJG Asbestos Solutions Ltd | Water & waste | 2026 |
| BJL Contracts Ltd | Construction | 2024 |
| BK Contractors Ltd | Construction | 2021 |
| BKF Services Ltd | Professional & scientific | 2025 |
| Black Bird Entertainment Ltd | Arts & recreation | 2024 |
| Black Diamond Travel Ltd | Transport & logistics | 2025 |
| Black Dog Streetwear Ltd | Wholesale & retail | 2007 |
| Black Gator Ltd | Wholesale & retail | 2022 |
| Black Knight Motors Ltd | Wholesale & retail | 2024 |
| Black Wolfe Limited | Wholesale & retail | 2022 |
| Blackburn Architects Limited | Professional & scientific | 2020 |
| Blackden Moorings Limited | Other services | 2001 |
| Blackmore Building Consultancy Limited | Professional & scientific | 2016 |
| Blackwells Patio Ltd | Construction | 2021 |
| Blackwood Asset Group Limited | Real estate | 2025 |
| Blades Air Limited | Construction | 2024 |
| Blakebrough Limited | Wholesale & retail | 2019 |
| Blakes Security Systems Limited | Other services | 1975 |
| Blanche Caring Heart Limited | Hospitality | 2020 |
| Bless Aaron Limited | Transport & logistics | 2013 |
| Blest Smith Financial Services Ltd. | Financial services | 2013 |
| BLF Home Improvements Limited | Construction | 2009 |
| Bligh Way Catering Limited | Hospitality | 2021 |
| Bligh Way Coffee Limited | Hospitality | 2018 |
| Blighway Fish Ltd | Wholesale & retail | 2023 |
| Blockchain Properties Ltd | Real estate | 2019 |
| Blok Tactical Skincare Ltd | Manufacturing | 2026 |
| Blokchainr Limited | Information & communication | 2022 |
| Bloomfield Equestrian Limited | Agriculture & fishing | 2026 |
| Bloomhedge Limited | Wholesale & retail | 2024 |
| Blossom Home & Lifestyle Limited | Wholesale & retail | 2025 |
| BLOSSOM2 Properties Ltd | Real estate | 2025 |
| Blucell Consulting Ltd | Professional & scientific | 2019 |
| Blue Apple Property Ltd | Real estate | 2023 |
| Blue Eagle Accountancy Ltd | Professional & scientific | 2018 |
| Blue EYE Solutions Limited | Information & communication | 2025 |
| Blue Lemon Cleaning Services Limited | Administrative & support | 2013 |
| Blue Line Transport Ltd | Transport & logistics | 2016 |
| Blue Oasis Care Limited | Administrative & support | 2023 |
| Blue Sky Commissioning Ltd | Professional & scientific | 2023 |
| Bluebridge Contracts Ltd | Professional & scientific | 2018 |
| Bluebrook Management (City Way) Limited | Construction | 2016 |
| Bluebrook Management Limited | Other services | 2014 |
| Bluecopia Ltd | Construction | 2022 |
| Bluegates Estate Management Limited | Real estate | 2021 |
| Blueprint Homes Limited | Real estate | 2003 |
| Bluetec Solutions Limited | Professional & scientific | 2013 |
| Bluetop Care Ltd. | Health & social care | 2022 |
| Blumer Lock Management Company Limited | Households | 2018 |
| BM Charles Logistics Ltd | Construction | 2019 |
| BM Dispatch Ltd | Wholesale & retail | 2025 |
| BMP Accounting & Consultancy Services Ltd | Professional & scientific | 2014 |
| BN (Sandridge) LLP | | 2023 |
| BNJ Properties Limited | Construction | 2013 |
| Bnku Limited | Wholesale & retail | 2022 |
| Boardroom Management Limited | Real estate | 2005 |
| Boba Tigers Rochester Ltd | Hospitality | 2024 |
| Bodega 51 Ltd | Wholesale & retail | 2021 |
| Body Bling Limited | Wholesale & retail | 2004 |
| Body Plant Sales Ltd | Wholesale & retail | 2024 |
| Body Plant Services Ltd | Wholesale & retail | 2014 |
| Body Sculpt by LRP Limited | Other services | 2019 |
| Body Wrap Limited | Wholesale & retail | 2021 |
| Boerkraal Ltd | Other services | 2023 |
| Boham Ltd | Construction | 2019 |
| Boichris Limited | Administrative & support | 2018 |
| Bola Limited | Construction | 2025 |
| Bolebroke Beagles Limited | Other services | 2006 |
| Bolt Broadband Ltd | Wholesale & retail | 2021 |
| Bombay Chilli Lower Stoke Ltd | Hospitality | 2024 |
| Bomi Ltd | Construction | 2015 |
| Bond Array Limited | Financial services | 2024 |
| Bond Carpentry Limited | Construction | 2023 |
| Bondy Properties Limited | Real estate | 2023 |
| Bonita Ecowear Ltd | Wholesale & retail | 2022 |
| Booham Surrey International UK Limited | Transport & logistics | 2019 |
| Bookingninja Ltd | Information & communication | 2025 |
| Boring Projects Ltd | Professional & scientific | 2024 |
| Born 4 Purpose Ministries (Kick UK) Community Interest Company | Other services | 2020 |
| BORN2RIDE Ltd | Wholesale & retail | 2020 |
| Borough Green Developments Limited | Real estate | 2001 |
| Borough Green Holdings Limited | Financial services | 2017 |
| Borough Green Properties Limited | Real estate | 1995 |
| Bosa Construction Ltd | Construction | 2022 |
| Bosa Scaffolding Services Limited | Construction | 2019 |
| Bosl (Holdings) Limited | Financial services | 2024 |
| Boss Apparel Limited | Wholesale & retail | 2017 |
| Bosworth Marketing Limited | Professional & scientific | 2025 |
| Bowen Moto Limited | Manufacturing | 2000 |
| Bowman Local Ltd | Wholesale & retail | 2023 |
| Boxable Limited | Manufacturing | 2018 |