| Becks Tree and Landscape Limited | Administrative & support | 2025 |
| BED E Buys (1957) Ltd | Wholesale & retail | 2016 |
| Bederov Limited | Professional & scientific | 2015 |
| Beds and Blankets Property Ltd | Real estate | 2021 |
| Bedwas Court Management Company Limited | Real estate | 2005 |
| Beech Lane Estate Management Company Ltd | Households | 2018 |
| Beechcraft Limited | Manufacturing | 1971 |
| Beeches Investments & Developments Ltd | Real estate | 2018 |
| Beechlands Accountancy Services Limited | Professional & scientific | 1991 |
| Beeley Wood Properties Limited | Construction | 1988 |
| Beep Beep Driving School Limited | Education | 2018 |
| Before YOU Build Ltd | Professional & scientific | 2026 |
| Begin Ready Services Limited | Professional & scientific | 2005 |
| Belgrave Asset Management Ltd | Financial services | 2000 |
| Belgrave Bath Holdings Ltd | Financial services | 2024 |
| Belgrave House Management Company Limited | Households | 2024 |
| Belgrave Life & Pensions Ltd | Financial services | 2000 |
| Belinda Jane Property Brighton Limited | Real estate | 2021 |
| Belinda Jane Property Ltd | Real estate | 2020 |
| Bell & Ross Limited | Hospitality | 1972 |
| Bell Hill Garage Limited | Wholesale & retail | 2002 |
| Bella Fields Limited | Extraterritorial | 2008 |
| Belle Zelle Studio Limited | Manufacturing | 2023 |
| Bellevue Partners Limited | Professional & scientific | 2008 |
| Bellevue Stellenbosch Limited | Wholesale & retail | 2025 |
| Bellfounded Technology Ltd | Wholesale & retail | 2021 |
| Belmont Developments & Management Ltd | Financial services | 2014 |
| Below the Line Finance Limited | Professional & scientific | 2020 |
| Belsham Consulting Ltd | Professional & scientific | 2024 |
| Belvedere Properties (Bath) Limited | Households | 1983 |
| BEN & BEL Ltd | Wholesale & retail | 2019 |
| BEN Franks Wine Ltd | Professional & scientific | 2019 |
| BEN Mercer Ltd | Professional & scientific | 2017 |
| BEN Rowland Limited | Information & communication | 2016 |
| Benchmarked Ltd | Wholesale & retail | 2021 |
| Bendica Ltd | Real estate | 2021 |
| Benevolence Legal Consultancy Limited | Professional & scientific | 2023 |
| Benicate Limited | Professional & scientific | 2006 |
| Benjisamosa Ltd | Financial services | 2025 |
| Bennion Holdings Limited | Financial services | 2021 |
| Berberi Ltd | Other services | 2026 |
| Berdoulat Ltd. | Professional & scientific | 2011 |
| Berkeley Bate Limited | Professional & scientific | 2011 |
| Berkeley Hall Marshall Limited | Professional & scientific | 2008 |
| Bespoke Documents Limited | Professional & scientific | 2022 |
| Bespoke Getaways Ltd | Administrative & support | 2020 |
| Bespoke Legal Recruitment Limited | Administrative & support | 2009 |
| Bespoke Performance Solutions Limited | Professional & scientific | 2007 |
| Bespokia Ltd | Information & communication | 2010 |
| Bess Polarity Limited | Professional & scientific | 2025 |
| Best British Schools Ltd | Other services | 2012 |
| Bester Family Investments Ltd | Hospitality | 2016 |
| Bethanyelbow Limited | Information & communication | 2013 |
| Bethfiit Business Ltd | Other services | 2022 |
| Betsi & Bean Limited | Hospitality | 2025 |
| Better Decisions: Research & Advisory Ltd | Professional & scientific | 2022 |
| Better Faster Happier Limited | Professional & scientific | 2022 |
| Better Meetings by Design Ltd | Information & communication | 2023 |
| Betterzone Property Management Limited | Households | 1986 |
| Bettie Labs Ltd | Information & communication | 2026 |
| Bevelin Consulting Ltd | Professional & scientific | 2021 |
| Bevis Nathan Associates | Health & social care | 2006 |
| Bewdley Commercial Consulting Limited | Administrative & support | 2010 |
| Beyond Conference Limited | Administrative & support | 2020 |
| Beyond Dispute Adjudication Services Ltd | Professional & scientific | 2012 |
| Beyond Dispute Limited | Professional & scientific | 2014 |
| BHB Capital Limited | Construction | 2014 |
| Biabelle Beauty Ltd | Manufacturing | 1999 |
| Bias for Action Limited | Professional & scientific | 2021 |
| Biblio Bath Ltd | Hospitality | 2012 |
| Bidu Bidu Books Ltd | Information & communication | 2021 |
| Bidu Bidu Publishing Ltd | Information & communication | 2007 |
| Biff Property Ltd | Real estate | 2023 |
| Bifold Company (Manufacturing) Limited | Extraterritorial | 1984 |
| Bifold Fluidpower (Holdings) Limited | Extraterritorial | 2002 |
| Bifold Fluidpower Limited | Manufacturing | 1984 |
| Bifold Group Limited | Professional & scientific | 2007 |
| Big Bang Burgers Ltd | Hospitality | 2022 |
| Big Burger Limited | Hospitality | 2019 |
| Big Commerce Group Limited | Wholesale & retail | 2023 |
| Big Hundred Limited | Professional & scientific | 2014 |
| Big MAN Pictures Ltd | Information & communication | 2016 |
| Big Picture by People Limited | Professional & scientific | 2024 |
| Big Red Sales Limited | Wholesale & retail | 2008 |
| Big Red Talent Limited | Arts & recreation | 2010 |
| Bigmedia Limited | Administrative & support | 1996 |
| Bikano Foods Ltd | Hospitality | 2019 |
| Bike Torque Racing Ltd. | Wholesale & retail | 1997 |
| Bilal and Brothers Ltd | Real estate | 2024 |
| Bill Brittain Consulting Limited | Administrative & support | 2017 |
| Billiard Room Limited | Administrative & support | 2009 |
| Billies Provisions Ltd | Wholesale & retail | 2017 |
| Billings Publicity Limited | Professional & scientific | 1987 |
| Billopak Limited | Professional & scientific | 2021 |
| Billy's Barbershop Limited | Other services | 2023 |
| Bilzon Consulting Ltd | Professional & scientific | 2020 |
| Binham Investments Limited | Financial services | 2025 |
| Biobalance Bath Ltd | Other services | 2024 |
| Biocentaur Ltd | Professional & scientific | 2013 |
| Biodiversity by Design Limited | Professional & scientific | 2006 |