| Bitora Limited | Transport & logistics | 2025 |
| Biyep Limited | Health & social care | 2010 |
| BJR Resources Ltd | Professional & scientific | 2011 |
| Blaise Murphet Limited | Professional & scientific | 2023 |
| Blessbridge Consult Ltd | Professional & scientific | 2025 |
| Blessed Hope Ltd | Construction | 2017 |
| Bloombox Productions Ltd | Information & communication | 2012 |
| Blue Apple Management Ltd | Administrative & support | 2019 |
| Blue Bell Woods Day Nursery Limited | Education | 2013 |
| Blue Demon Limited | Other services | 2016 |
| Blueberry Books Limited | Information & communication | 2021 |
| Bluefishshop Limited | Wholesale & retail | 2008 |
| Blueorkidz Ltd | Education | 2025 |
| BO Collars UK Limited | Wholesale & retail | 2019 |
| Boatyard Vista Ltd | Real estate | 2021 |
| Bobby Builder and Landscapers Ltd | Construction | 2023 |
| Bobcat Property Ltd | Real estate | 2022 |
| Bombka Ltd | Transport & logistics | 2023 |
| Bonco Properties Limited | Real estate | 2003 |
| Bongo Designs Limited | Professional & scientific | 2007 |
| Bongo Developments Limited | Financial services | 2015 |
| Boston and Alexander Holdings Limited | Other services | 2019 |
| Boston and Alexander LLP | | 2010 |
| Boston and Alexander Nominees Limited | Other services | 2020 |
| Boston and Alexander Solutions Limited | Financial services | 2025 |
| Bourne Health Limited | Financial services | 2023 |
| Bourne Medical Limited | Real estate | 2021 |
| BPJ Consulting Ltd | Information & communication | 2025 |
| BPS Futures Limited | Professional & scientific | 2016 |
| Br-Light UK Limited | Wholesale & retail | 2024 |
| Brambledown Management Limited | Households | 1971 |
| Brancaster Holdings Limited | Real estate | 2020 |
| Brandimarte Import Ltd | Other services | 2023 |
| Braxo Limited | Real estate | 2015 |
| Breland Housing Limited | Extraterritorial | 2008 |
| Brial Private Limited | Professional & scientific | 2021 |
| Bright Future Letting Ltd | Real estate | 2025 |
| Bright Little Stars Day Nursery Ltd | Health & social care | 2022 |
| Brighter IT Limited | Information & communication | 2015 |
| Brighton Enterprise Limited | Wholesale & retail | 2022 |
| Brighton Motor Sales Ltd | Wholesale & retail | 2019 |
| Brighton Road Developments Ltd | Construction | 2020 |
| Brighton Road Residential Ltd | Real estate | 2022 |
| Brilliant Brain Friends Ltd | Wholesale & retail | 2025 |
| Britannia Motorcade Ltd | Transport & logistics | 2022 |
| Britannia Wholesale Ltd | Wholesale & retail | 2023 |
| Britbul Limited | Transport & logistics | 2008 |
| Broadway Medical Group Ltd | Wholesale & retail | 2025 |
| Broadway Securetech Ltd | Construction | 2026 |
| Bronze Systems Ltd | Information & communication | 2014 |
| Bryad Ltd | Construction | 2016 |
| Built by MRC Ltd | Construction | 2022 |
| Built Financial Technologies Ltd | Information & communication | 2025 |
| Burnham I.C.O.P.E Limited | Financial services | 2022 |
| Bushfield Recycling Ltd | Water & waste | 2024 |
| Bushmeadow Limited | Real estate | 1996 |
| Business Growth Bureau Ltd | Professional & scientific | 2019 |
| Businesswomen Circle Ltd | Administrative & support | 2024 |
| Busybei Finance Services Ltd | Professional & scientific | 2025 |
| Buttermere Partnership Ltd | Construction | 2023 |
| BW Pest Control Ltd | Administrative & support | 2022 |
| BWP Technologies Limited | Information & communication | 2025 |
| BWR Solutions Ltd | Information & communication | 2015 |
| BWR Strategy UK Limited | Real estate | 2018 |
| BY Zahra Ltd | Education | 2025 |
| Bylands Court Residents Limited | Real estate | 2008 |
| Bytesy Ltd | Information & communication | 2026 |
| BZ Actuarial Ltd | Financial services | 2024 |
| C Barter Exchange | Financial services | 2024 |
| C.Y.J. Ltd | Real estate | 2017 |
| Cablevision-Uk Limited Partnership | | 1985 |
| Cachla Ltd | Professional & scientific | 2021 |
| Cakes & Bakes Sutton Ltd | Wholesale & retail | 2020 |
| Cakes and Bakes Epsom Ltd | Wholesale & retail | 2023 |
| Callow Field Residents Assoc. Limited | Households | 1981 |
| CAM & Cart Electrical Ltd | Construction | 2009 |
| Camb Holdings Ltd | Real estate | 2025 |
| Campbell & SON Building Services Ltd | Construction | 2025 |
| Camrose Court Residents Association Limited | Other services | 2006 |
| Cannonfire Limited | Extraterritorial | 1986 |
| Capri Sun UK Limited | Wholesale & retail | 2019 |
| Captured Solutions Limited | Information & communication | 2020 |
| Car Harbour Ltd | Wholesale & retail | 2019 |
| Cararad Ltd | Health & social care | 2023 |
| Carefree Assisted Taxis Ltd | Transport & logistics | 2002 |
| Carepersonnel Ltd | Professional & scientific | 2015 |
| Carter House Ventures Ltd | Professional & scientific | 2026 |
| Casa Feliz Limited | Real estate | 2019 |
| Castlebrick Urban Living 1 Ltd | Real estate | 2025 |
| Castlebrick Urban Living 2 Ltd | Real estate | 2026 |
| Catalyse Data Limited | Information & communication | 2016 |
| Caterham Hill Management Limited | Wholesale & retail | 2002 |
| CBS Info-Tech Ltd | Information & communication | 2021 |
| Ceaser Holdings Limited | Health & social care | 2023 |
| Cedar Developments Limited | Real estate | 2006 |
| Cedar Holdings (UK) Limited | Real estate | 2006 |
| Celticpharm Limited | Wholesale & retail | 2005 |
| Ceylon EYE Limited | Other services | 2025 |
| CF Devil's Path Limited | Arts & recreation | 2015 |
| CFD Innovations Limited | Professional & scientific | 2023 |