| Borteshies Limited | Hospitality | 2005 |
| Boseco Limited | Financial services | 2007 |
| Boss Design (US) Limited | Manufacturing | 2005 |
| Bostin Brews Ltd | Manufacturing | 2016 |
| Bourne House Management Company Limited | Households | 1982 |
| Bowling Finishing Services Ltd | Manufacturing | 1993 |
| Bowmat Fencing Ltd | Administrative & support | 2005 |
| BPC Finance & Leasing Limited | Wholesale & retail | 2010 |
| Braakx Limited | Administrative & support | 2004 |
| Bracebridge Estates Limited | Real estate | 1980 |
| Bradbourn Miles Limited | Real estate | 2008 |
| Bradford Street and Cheapside Properties Limited | Real estate | 1914 |
| Bradford Street Properties LLP | | 2006 |
| Bradley Cooper Carpentry & Joinery Ltd | Construction | 2012 |
| Bradley Environmental Consultants Limited | Water & waste | 1991 |
| Bradleys Limited | Real estate | 1936 |
| Brandhall Labour Club Limited | Hospitality | 1963 |
| Brandon Jones Partnership | | 1994 |
| Bratwurst - Flori Limited | Administrative & support | 2004 |
| Brayfal Limited | Wholesale & retail | 1986 |
| Brazil Nongprui Silicon Mining Group Chemical Co., Ltd | Mining & quarrying | 2023 |
| BRC Industrial Roofing (Midlands) Limited | Construction | 1994 |
| Break Forth International Church, Davies M. Mulenga Ministries Ltd | Other services | 2006 |
| Brewers Sewing Machines Limited | Administrative & support | 1976 |
| Bridge Fashions | | 1999 |
| Bridge Garage Autos Limited | Wholesale & retail | 2008 |
| Bridge Trustees Limited | Administrative & support | 1991 |
| Brierley Hill Motor Parts Limited | Wholesale & retail | 2007 |
| Bright Eyes Day Care Nursery Ltd. | Education | 2002 |
| Brindley-Robinson Ltd | Real estate | 2024 |
| Brindleys Directors Ltd | Extraterritorial | 2003 |
| Bristol Lawrence Ltd | Hospitality | 2022 |
| BRISTOL786 Ltd | Hospitality | 2021 |
| Brita Finish Limited | Manufacturing | 2002 |
| Brittannia Game Designs Ltd | Information & communication | 1997 |
| Brixham Homes Limited | Real estate | 1983 |
| Broad Oaks Health Clinic Limited | Health & social care | 2003 |
| Broadoaks UK Limited | Administrative & support | 1997 |
| Broadway Associates Limited | Professional & scientific | 2007 |
| Broadway Kitchens & Bedrooms (Midlands) Limited | Manufacturing | 1999 |
| Bromac Machining Services Limited | Manufacturing | 2004 |
| Bromley Carpets Limited | Wholesale & retail | 2001 |
| Brookdale Technical Services Ltd. | Information & communication | 2002 |
| Brookeson Material Handling Limited | Manufacturing | 2002 |
| Brooks England Limited | Manufacturing | 2000 |
| Brooks Forgings Limited | Manufacturing | 1976 |
| Brooks Road Freeholders Limited | Households | 2004 |
| Brookside Metal Company Limited | Real estate | 1995 |
| Broomhall Enterprises Limited | Wholesale & retail | 2003 |
| Brown & Burr Limited | Wholesale & retail | 2002 |
| Browns Restaurant (Brighton) Limited | Extraterritorial | 1981 |
| Browns Restaurant (Bristol) Limited | Extraterritorial | 1989 |
| Browns Restaurant (Cambridge) Limited | Extraterritorial | 1975 |
| Browns Restaurant (London) Limited | Extraterritorial | 1934 |
| Browns Restaurant (Oxford) Limited | Extraterritorial | 1983 |
| Browns Restaurants Limited | Extraterritorial | 1971 |
| Brymar Ltd | Transport & logistics | 2019 |
| Building and Garden Services Limited | Other services | 2003 |
| Building Management & Consultancy Limited | Construction | 2006 |
| Buildmark Construction (Coventry) Limited | Construction | 2005 |
| Bullman Design Limited | Other services | 1995 |
| Burlton Properties Limited | Real estate | 2004 |
| Burrows Family Limited | Professional & scientific | 2003 |
| Business AID Limited | Professional & scientific | 2002 |
| Business Research (UK) Ltd | Professional & scientific | 2000 |
| Business Wizards Limited | Professional & scientific | 2003 |
| C & G Practice Limited | Extraterritorial | 2007 |
| C J Green Limited | Construction | 2003 |
| C P Contractors Limited | Construction | 2006 |
| C&F Group Holdings Limited | Professional & scientific | 2002 |
| C&T Industry Company Limited | Extraterritorial | 2006 |
| C. Bastock (Contracts) Limited | Other services | 1996 |
| C. Bastock (Funeral Directors) Limited | Other services | 1975 |
| C. Roberts & Associates Limited | Professional & scientific | 2006 |
| C.H.T. Galvanizing Limited | Extraterritorial | 1990 |
| C.H.W. Consulting Limited | Professional & scientific | 2003 |
| C.L. Electrical Services Ltd | Construction | 2004 |
| C.V. Fleet Cleaning Services Ltd | Administrative & support | 2002 |
| C.W. Bryan Environmental Limited | Professional & scientific | 1997 |
| C2 Consulting Limited | Information & communication | 2000 |
| Cacoullis Limited | Wholesale & retail | 2004 |
| CAD Services - MVM Limited | Professional & scientific | 2006 |
| Cafe Casita Limited | Hospitality | 2006 |
| Cafiaid Limited | Wholesale & retail | 1986 |
| Caladar Services Ltd | Manufacturing | 2003 |
| Calderfields Golf Academy Limited | Arts & recreation | 1981 |
| Caldmore Hardware Limited | Wholesale & retail | 2003 |
| Caldmore Ltd | Manufacturing | 2006 |
| Calthorpe Developments Limited | Real estate | 2000 |
| Calthorpe Estates Limited | Extraterritorial | 2007 |
| Cambridge Peptides Limited | Professional & scientific | 2004 |
| Campbells Insurance Consultants Limited | Financial services | 1981 |
| CAN & Bottling Services (UK) Limited | Construction | 2002 |
| Cannich Ltd | Administrative & support | 2022 |
| Cannon Tools Limited | Wholesale & retail | 2004 |
| Canton Management Limited | Professional & scientific | 2003 |
| Capel Tabernacl Management Company Limited | Households | 2000 |
| Capevale Limited | Real estate | 1992 |
| Capital Financial Management Limited | Financial services | 2003 |
| Capital Galvanizing Limited | Extraterritorial | 1960 |