| Beaumont Logistics Ltd | Wholesale & retail | 2026 |
| Beauty&Trend London Ltd | Education | 2021 |
| Beck Enterprises Limited | Wholesale & retail | 1993 |
| Beck Nichols Properties Limited | Real estate | 2017 |
| Beckenham Business Services Limited | Professional & scientific | 2002 |
| Beckenham Electrics Ltd | Wholesale & retail | 2004 |
| Beckenham Launderette Ltd | Other services | 1967 |
| Becket Insurance Services Limited | Financial services | 1989 |
| Beckwith Retail Limited | Wholesale & retail | 2006 |
| Bedroom Flair Limited | Administrative & support | 2002 |
| Beechcroft One Limited | Households | 2003 |
| Beechmist Limited | Hospitality | 2006 |
| Beechwood Residents Limited | Households | 1985 |
| Beeline Storage & Distribution Limited | Extraterritorial | 2005 |
| Beever Capital Limited | Professional & scientific | 2008 |
| Bell House Services Limited | Wholesale & retail | 2002 |
| Bellegrove Independent Financial Advisers Ltd. | Financial services | 1999 |
| Belliamco Electrical Services Limited | Construction | 2015 |
| Bellseal Limited | Manufacturing | 2006 |
| Belmont Balti House Ltd | Hospitality | 2024 |
| Beltane MBH Investment Limited | Extraterritorial | 2017 |
| Beltinge (UK) Ltd | Hospitality | 2020 |
| Bembrook Limited | Hospitality | 1992 |
| Benazeer Limited | Hospitality | 2023 |
| Benchflow Limited | | 1984 |
| Benchmark Building Surveyors Limited | Professional & scientific | 2007 |
| Benchmark Consultant Services Ltd | Professional & scientific | 2024 |
| Benenden School (Kent) Limited | Education | 1924 |
| Benenden School Trust (the) | Extraterritorial | 1983 |
| Benfi Limited | Arts & recreation | 2003 |
| Benjeh MAX Limited | Health & social care | 2022 |
| Benmanor Limited | Households | 1988 |
| Bennett Opie,Limited | Manufacturing | 1912 |
| Benstar Associates Limited | Real estate | 1993 |
| Bentex Designs Limited | Professional & scientific | 1985 |
| Benthall Limited | Administrative & support | 2003 |
| Bentley Damp Proofing Limited | Other services | 2007 |
| Beracah Administration Limited | Professional & scientific | 1999 |
| Berkeley LA Roche Financial Consultants Ltd | Financial services | 2000 |
| Berkeley LA Roche Management Limited | Professional & scientific | 2000 |
| Berrycote Limited | Administrative & support | 2000 |
| Bert & Montgomery Limited | Hospitality | 2021 |
| Bertam Consolidated Rubber Company Limited | Financial services | 1906 |
| Berwins Trust Corporation Limited | Professional & scientific | 2025 |
| Bespoke Design & Building Services Limited | Professional & scientific | 2006 |
| Bespoke Design Solutions Limited | Manufacturing | 2004 |
| Bessgate Limited | Households | 1985 |
| Best Car Service Limited | Transport & logistics | 1998 |
| Best Kleen Limited | Administrative & support | 2024 |
| Best Property Management Limited | Construction | 2003 |
| Best Smart Phone UK Ltd | Wholesale & retail | 2024 |
| Bestway Builders Limited | Construction | 2003 |
| Bethany School | Education | 1959 |
| Better Collective UK Services Ltd | Professional & scientific | 2007 |
| Betteradjust Limited | Administrative & support | 1992 |
| Bexley & Sidcup Property Co. Limited | Construction | 1958 |
| Bexley Car Sales Limited | Wholesale & retail | 2007 |
| Bexley Crossroads Care Limited | Health & social care | 1999 |
| Bexley Internet Solutions Limited | Information & communication | 2003 |
| Bexley Joinery Limited | | 1981 |
| Bexley Manor Nursery School Limited | Education | 2003 |
| Bexley Wines Ltd | Wholesale & retail | 2004 |
| Bexleyheath Curry House Ltd | Hospitality | 2020 |
| Bexlink Limited | Information & communication | 2003 |
| BGS (London) Limited | Real estate | 1995 |
| BH Engineering Limited | Construction | 2006 |
| BH Plant Hire Ltd | Administrative & support | 2022 |
| Bicc Cables Limited | Professional & scientific | 2005 |
| Biddenden Vineyards Limited | Manufacturing | 1975 |
| Bidova Consulting Limited | Wholesale & retail | 2022 |
| Bidova Properties Limited | Real estate | 2023 |
| Biens Investment Limited | Real estate | 2021 |
| Big Bash Music Company Limited | Education | 2002 |
| Bigger Picture Life Ltd | Information & communication | 2011 |
| Biggin Hill Spice Ltd | Real estate | 2013 |
| Bilaney Consultants Limited | Professional & scientific | 1990 |
| Bill & SUE Ferguson Limited | Information & communication | 2003 |
| Billa Contractors Ltd | Construction | 2023 |
| Billa Homes Ltd | Real estate | 2023 |
| Billings Jackson Limited | Professional & scientific | 1998 |
| Billys Plumbing Ltd Ltd | Construction | 2024 |
| Bingham Associates Limited | Professional & scientific | 2008 |
| Biochris Building Limited | Construction | 2016 |
| Biod Consultancy Limited | Professional & scientific | 2025 |
| Bioscience Services (UK) Limited | Health & social care | 1997 |
| Birchwood Partners Limited | Real estate | 2019 |
| Birdies-Baudemont Foods Limited | Hospitality | 2003 |
| Birkbeck Auto Repairs Ltd | Wholesale & retail | 2004 |
| Birkbeck Natural Health Centre Limited | Health & social care | 2006 |
| Birthday Buddy Limited | Extraterritorial | 2000 |
| Bishop Estate Agents Ltd | Real estate | 2013 |
| Bishop Whitehead Limited | Real estate | 1999 |
| Bishops Stortford Sales Limited | Professional & scientific | 2006 |
| Bishopsbridge Management Ltd | Professional & scientific | 1996 |
| Bisla Investments LLP | | 2018 |
| BK Aggtech Limited | Manufacturing | 1992 |
| BKM Transport UK Ltd | Wholesale & retail | 2007 |
| BKT Group Holdings Limited | Extraterritorial | 1994 |
| Black Eagle Limited | Wholesale & retail | 1988 |
| Black Shadow Limited | Financial services | 2007 |