| Brelades Limited | Professional & scientific | 2006 |
| Brentford Electric Limited | Professional & scientific | 1978 |
| Brentford Regulators Limited | Professional & scientific | 1972 |
| Breydon Management Ltd | Real estate | 2002 |
| Brian Johnston & Co (Insurance Brokers) Limited | Financial services | 1986 |
| Brian Johnston & Co. (Insurance Services) Limited | Financial services | 1972 |
| Briarbank Estates Limited | Real estate | 1991 |
| Briarcrown Limited | Households | 1985 |
| Bricklead Limited | Professional & scientific | 2001 |
| Brickneat Limited | Professional & scientific | 2001 |
| Brickpoint (London) Ltd. | Construction | 1994 |
| Brickwood Limited | Real estate | 1995 |
| Bridge Mews (Woking) Management Limited | Professional & scientific | 2001 |
| Bridge the GAP Management Services Limited | Professional & scientific | 2003 |
| Bridgeton Investments Limited | Real estate | 2000 |
| Bridgevere Ltd | Financial services | 2026 |
| Bright Agents Limited | Real estate | 2009 |
| Bright Seasons Ltd | Administrative & support | 2014 |
| Bright Sparkes Limited | Education | 2002 |
| Brightmarch Property Management Limited | Households | 2002 |
| Brightsparcs Limited | Households | 1996 |
| Brightsunshine Ltd | Manufacturing | 2017 |
| Brilliant Casting Limited | Administrative & support | 2012 |
| Brimere Limited | Real estate | 1986 |
| Brincombe Limited | | 1978 |
| Brington Associates Limited | Professional & scientific | 2026 |
| Briskware Limited | Information & communication | 2005 |
| Bristlegrove Limited | Real estate | 1982 |
| Bristol Consumer Health Ltd | Wholesale & retail | 2017 |
| Bristol Standard Estates,Limited | Construction | 1931 |
| Bristow Helicopter Group Limited | Transport & logistics | 1991 |
| Bristow Leasing Limited | Administrative & support | 2023 |
| Bristow Southeast Asia Limited | Administrative & support | 2007 |
| Bristow Staff Pension Scheme Trustees Limited | Financial services | 1991 |
| Brit School for International Education Limited | Education | 2025 |
| Britannia Connections Limited | Administrative & support | 2005 |
| British Home Entertainment Limited | Information & communication | 1960 |
| British Worldwide Enterprises Limited | Construction | 1996 |
| Britten Properties Investments Limited | Real estate | 2019 |
| Broad Oak Store Ltd | Wholesale & retail | 2022 |
| Broadwater Lodge Properties Limited | Real estate | 1996 |
| Brockett Investment Company Limited | Real estate | 1939 |
| Brockton Management Limited | Administrative & support | 1973 |
| Broda Limited | Information & communication | 2000 |
| Brodersen & Co. Ltd | Professional & scientific | 2003 |
| Brolon Intertrade Limited | | 1977 |
| Brompton Capital Investments Limited | Real estate | 2007 |
| Brompton Planning Limited | Professional & scientific | 2016 |
| Brook Marketing Consultancy Limited | Professional & scientific | 2013 |
| Brookdale Properties Limited | Construction | 1954 |
| Brookfield Aviation International Limited | Other services | 1995 |
| Brooklands Estate Management Limited | Households | 2005 |
| Brooklands of Byfleet Limited | | 1974 |
| Brookmaple Developments Ltd | Professional & scientific | 2000 |
| Brooks Commercial Limited | Administrative & support | 2000 |
| Brooks Winchester Limited | Construction | 2001 |
| Brookview Lodge RTM Company Limited | Households | 2004 |
| Broomsquires Residents Company Limited | Households | 1976 |
| Brothers FF UK Ltd | Hospitality | 2025 |
| Brown & BAM Limited | Professional & scientific | 2003 |
| Brown House Management Co Ltd | Real estate | 2026 |
| Brown Signs Limited | Manufacturing | 2005 |
| Brownley Engineering Company Limited | Manufacturing | 2004 |
| Bruce Almighty Limited | Administrative & support | 2000 |
| Bruno Girardeau Partnership | | 2001 |
| Brushly Ltd | Construction | 2026 |
| Bryan Izzard Partnership | | 2002 |
| Brymarts Ltd | Administrative & support | 2004 |
| Bsbg Ltd | Hospitality | 2020 |
| Bsooriy Properties Ltd | Real estate | 2023 |
| BSW Heating Ltd | Construction | 1972 |
| BTM IT Consultancy Ltd | Administrative & support | 2015 |
| BTU (Installation & Maintenance) Limited | Construction | 1981 |
| Bucher Municipal Limited | Manufacturing | 1924 |
| Buckinghams Limited | Real estate | 1994 |
| Buckland Rest Homes Limited | Health & social care | 2005 |
| Buckle & Partners Limited | Financial services | 1997 |
| Builder MAX Ltd | Construction | 2014 |
| Bulk Storage & Process Systems Limited | Manufacturing | 1999 |
| Bulldog Musical Entertainments Limited | Arts & recreation | 1982 |
| Bulldog Plantire Limited | | 1980 |
| Burfield Drive Limited | Households | 1987 |
| Burford Residents Limited | Households | 2006 |
| Burgess Glass Limited | Construction | 1975 |
| Burgh Heath Lodge Limited | Health & social care | 2005 |
| Burhill Developments Limited | Real estate | 1998 |
| Burhill Golf and Leisure Limited | Arts & recreation | 1980 |
| Burhill Golf Centres Limited | Extraterritorial | 1983 |
| Burley Games Limited | Manufacturing | 2003 |
| Burlingdale Limited | Construction | 1973 |
| Burney House Properties Limited | Real estate | 2000 |
| Burns & Mason Fireplaces Limited | Administrative & support | 2001 |
| Burwood House (Oxted) Management Company Limited | Households | 1988 |
| Burwood Park (Woodlands Close) Limited | Real estate | 1972 |
| Business Accounting Solutions Information Systems Limited | Wholesale & retail | 1997 |
| Business Centre (Woking) Limited | Financial services | 1998 |
| Business Management Services (Bms)Limited | Professional & scientific | 2006 |
| Business Secure Limited | Information & communication | 2007 |
| Butler & Leach Electrical Limited | | 1976 |
| Butterfly Design & Build Limited | Construction | 2019 |