| Black Stone Services Group Ltd | Administrative & support | 2026 |
| Blackrock Wines Limited | Hospitality | 2003 |
| Bloomsbury Apartments Limited | Real estate | 2022 |
| Bloomwell Estate Ltd | Real estate | 2018 |
| Blountain Ltd | Real estate | 2018 |
| Blue Overall Ltd | Transport & logistics | 2022 |
| Blue Space Building Limited | Construction | 2016 |
| Bluefoot Chilled Logistics Ltd | Transport & logistics | 2025 |
| Bluepine Estates Limited | Real estate | 2019 |
| Blueprint Jump Limited | Education | 2013 |
| Blueriver Real Estate Ltd | Real estate | 2021 |
| Bluestone Talent Management Ltd | Professional & scientific | 2002 |
| Bluhaven Supply Ltd | Wholesale & retail | 2026 |
| Blur Property Ltd | Real estate | 2024 |
| BM Holmes Limited | Real estate | 2025 |
| Boma Commercial Property Ltd | Real estate | 2020 |
| Bonkonzept Holding Ltd | Financial services | 2021 |
| Bookpen Limited | Extraterritorial | 2019 |
| Bootmax Limited | Real estate | 2018 |
| Boshkin’S Bakery Limited | Wholesale & retail | 2025 |
| Bothwell Gray Limited | Information & communication | 2013 |
| Boto Enterprise Limited | Wholesale & retail | 2009 |
| Bourgeois Trading Ltd | Wholesale & retail | 2025 |
| Boutik Research Limited | Professional & scientific | 2012 |
| Bowman ENT Limited | Hospitality | 2022 |
| Bowyer Carpentry & Building Limited | Construction | 2023 |
| Bradley-Ross Holdings Limited | Real estate | 2021 |
| Bran International Ltd | Real estate | 2018 |
| Brandwood Events Limited | Other services | 2026 |
| Bratus Limited | Construction | 2016 |
| Braver Court (Teddington) Residents Association Limited | Households | 1975 |
| Braver Studios Ltd | Administrative & support | 2020 |
| Brazil Energy Holdings Ltd | Professional & scientific | 2017 |
| Brechin Place Freehold Limited | Households | 2010 |
| BRG Translation Limited | Education | 2006 |
| Brian Phillips Electrical Limited | Professional & scientific | 2017 |
| Briar Consultancy Ltd | Professional & scientific | 2019 |
| Brick Castle Limited | Real estate | 2016 |
| Brickety Ltd | Real estate | 2018 |
| Brickfield Services Limited | Construction | 2007 |
| Brickthrough Limited | Extraterritorial | 2018 |
| Brickworks Way Ltd | Real estate | 2022 |
| Bridgwater Entertainments Limited | Hospitality | 1995 |
| Brikaura Property Investments Ltd | Financial services | 2025 |
| British Fire Protection Systems Association Limited(The) | Other services | 1966 |
| Broad Property Investments Ltd | Real estate | 2018 |
| Broadcast & Production Services (UK) Limited | Wholesale & retail | 2003 |
| Broadstone Limited | Real estate | 1980 |
| Bronze Play Limited | Information & communication | 2026 |
| Brookesport Limited | Arts & recreation | 2019 |
| Brooklands Place Residents Association Limited | Households | 2004 |
| Broom Park Management Association Limited | Households | 1969 |
| Broome Jenkins Limited | Administrative & support | 2003 |
| Brownian E-Motions Limited | Information & communication | 2012 |
| BSM International Ltd | Professional & scientific | 2016 |
| Buccaneer House Residents Ltd | Households | 2006 |
| Buckleys Building Surveys Limited | Other services | 1997 |
| Buhwal Ltd | Hospitality | 2026 |
| Buildaspace Limited | Construction | 2016 |
| Builds Inc. Ltd | Wholesale & retail | 2026 |
| Bumblebee Tuna London Ltd | Other services | 2026 |
| Burleigh House Estates Limited | Households | 2010 |
| Burts Cycles Limited | Wholesale & retail | 2014 |
| Business Futures Network Limited | Extraterritorial | 1990 |
| Business Protection Systems (UK) Limited | Professional & scientific | 2004 |
| Busy DAD Training App Limited | Information & communication | 2025 |
| BYE Property Investments Ltd. | Real estate | 2015 |
| C N Transport Logistics Ltd | Transport & logistics | 2026 |
| C Quinn Limited | Professional & scientific | 2007 |
| C&M Pro Clean Ltd | Administrative & support | 2022 |
| C&P Leisure Property Developer Limited | Real estate | 2019 |
| C&Y Story Ltd | Wholesale & retail | 2024 |
| C-Centric Limited | Information & communication | 2009 |
| C.R.K.Property Management Ltd | Construction | 2026 |
| Cabin Knives Ltd | Manufacturing | 2020 |
| Caboran Ltd | Transport & logistics | 2025 |
| Cacao Collective Limited | Wholesale & retail | 2025 |
| Cafe Venice Limited | Hospitality | 2000 |
| CAJ Props Ltd | Real estate | 2019 |
| Call Collected Ltd | Information & communication | 2020 |
| Calmeus Limited | Professional & scientific | 2014 |
| Calvary Chapel Twickenham Limited | Other services | 2002 |
| Cambridge House RTM Company Limited | Households | 2022 |
| Cambridge Road Property Co. Limited | Real estate | 1956 |
| Camven Ltd | Professional & scientific | 2015 |
| Canning Factory Limited | Professional & scientific | 2003 |
| Capisco.Ai Ltd | Information & communication | 2016 |
| Capital Carpets Limited | Construction | 2014 |
| Caplapoint Estates Limited | Real estate | 2001 |
| Caplapoint Investments Limited | Real estate | 1959 |
| Caraeno Limited | Real estate | 2010 |
| Carafort Limited | Professional & scientific | 2021 |
| Caramon Properties Ltd | Real estate | 2015 |
| Carbon Score Limited | Information & communication | 2023 |
| Care Management (Agency) Ltd | Professional & scientific | 2014 |
| Care Support Corporation Ltd | Administrative & support | 2017 |
| Caribbean Drinks Ltd | Manufacturing | 2009 |
| Carlier Ltd | Real estate | 2019 |
| Carne Consulting Limited | Professional & scientific | 2019 |
| Caroconti Ltd. | Information & communication | 2008 |