| Benni Essex Ltd | Other services | 2019 |
| Benny's Kitchen Ltd | Hospitality | 2026 |
| Benotex Limited | Wholesale & retail | 2022 |
| Bensley Property Group Limited | Professional & scientific | 2017 |
| Benson Racing Limited | Agriculture & fishing | 2020 |
| Bentley Admin Limited | Financial services | 2007 |
| Bentley Auto & Tyre Centre Ltd | Wholesale & retail | 2013 |
| Bentley Automotive Limited | Wholesale & retail | 2003 |
| Bentley Building Contractors Limited | Construction | 2021 |
| Bentley Country Park Limited | Hospitality | 1963 |
| Bentley Grange Management Company Limited | Households | 2015 |
| Bentley Health Homecare Ltd | Health & social care | 2024 |
| Bentley Health Limited | Financial services | 2024 |
| Bentley Paraplanning Limited | Financial services | 2012 |
| Bentley Salvage Ltd | Water & waste | 2013 |
| Berechurch Arms Ltd | Hospitality | 2019 |
| Berechurch Hall Limited | Households | 1990 |
| Beria Limited | Other services | 2019 |
| Berk Tailoring Ltd | Other services | 2020 |
| Berkeley Gardens (Highwoods) Management Company Limited | Households | 1985 |
| Berkeley Hall Care Homes Limited | Real estate | 2019 |
| Berkeley Investments Ltd | Professional & scientific | 2015 |
| Bernhardt & FOY Limited | Wholesale & retail | 2009 |
| Berry Steel Services Ltd | Wholesale & retail | 2019 |
| Berryman Management Company Limited | Professional & scientific | 2005 |
| Berryworld US Holdings Limited | Financial services | 2022 |
| BES Roofing Ltd | Construction | 2023 |
| Bespoke Emerald Embroidery Ltd | Wholesale & retail | 2019 |
| Bespoke Landlord Services Limited | Real estate | 2016 |
| Bespoke Steel Structures Limited | Construction | 2019 |
| Best Cargo and Shipping Services Limited | Transport & logistics | 2026 |
| Best Catering Essex Ltd | Hospitality | 2025 |
| Best Commutes Ltd | Real estate | 2019 |
| Best Days Vintage Ltd | Wholesale & retail | 2013 |
| Best Medical Experts Limited | Health & social care | 2019 |
| Best Opportunity Careers Ltd | Administrative & support | 2020 |
| Bestu's Ltd | Administrative & support | 2020 |
| Bestwall Estate Company Limited | Administrative & support | 2001 |
| Betengine Ltd | Information & communication | 2024 |
| Beth Chatto Education Trust | Education | 2014 |
| Beth Newiss and Associates Limited | Professional & scientific | 2023 |
| Bethel Cloud Technologies Ltd. | Information & communication | 2016 |
| Bethg Beauty Ltd | Other services | 2020 |
| Better Branding Limited | Professional & scientific | 2025 |
| Betterment Services Ltd | Construction | 2017 |
| Betts & Cranfield Limited | Construction | 2017 |
| Betts & Cranfield Property Ltd | Real estate | 2019 |
| Betzero Group Limited | Information & communication | 2025 |
| Beverley Road Management Company Limited | Households | 2014 |
| Bewell London Centre Ltd | Wholesale & retail | 2024 |
| Bewers Limited | Construction | 2023 |
| Bewigged Ltd | Arts & recreation | 2020 |
| Bexville Management Limited | Households | 2011 |
| Beyond Cooling Ltd | Construction | 2025 |
| Beyond Gains Ltd | Information & communication | 2024 |
| Beyond Migraine Ltd | Education | 2025 |
| Beyond Platinum Ltd | Health & social care | 2013 |
| Beyond Recruitment Ltd | Administrative & support | 2026 |
| Beyond the Box Avon Way Alpha Limited | Real estate | 2017 |
| Beyond the Box Avon Way Beta Limited | Construction | 2017 |
| Beyond the Box Colne Quay Beta Limited | Construction | 2018 |
| Beyond the Box Developments Limited | Construction | 2017 |
| Beyond the Box Group Limited | Construction | 2020 |
| Beyond the Box Student Limited | Hospitality | 2017 |
| Beyond the Realm Ltd | Professional & scientific | 2024 |
| Beyondnow Property Ltd | Real estate | 2025 |
| Beyondnow Travel Ltd | Other services | 2025 |
| Bezza Holdings Limited | Financial services | 2019 |
| BFA Mechanics Ltd | Wholesale & retail | 2024 |
| Bfcc Garage Doors Ltd | Construction | 2013 |
| BFS (Heating) Limited | Construction | 2019 |
| BGA Financial Services Limited | Financial services | 1994 |
| BH Electrical Limited | Construction | 2007 |
| BH-M0509 Limited | Real estate | 2024 |
| Bhad Bhabie Limited | Wholesale & retail | 2025 |
| Bhairab Welfare Association UK Ltd | Other services | 2016 |
| Bhascare Solutions Ltd | Information & communication | 2023 |
| Bhbd Training Ltd | Other services | 2024 |
| BHK Holdings Limited | Professional & scientific | 2011 |
| Biana E-Commerce Ltd | Wholesale & retail | 2020 |
| Bianca Vibe Cafe Ltd | Hospitality | 2026 |
| Biantex Limited | Construction | 2021 |
| Bidgood Consultancy Ltd | Construction | 2026 |
| Bifoldsales Limited | Extraterritorial | 2022 |
| Big Bounce Event International Ltd | Administrative & support | 2019 |
| Big Car Boots Co. Limited | Arts & recreation | 2003 |
| Big Day Bookings Limited | Transport & logistics | 2017 |
| Big Foot Television Limited | Information & communication | 2006 |
| Big Juicy Burgers( Colchester) Limited | Hospitality | 2024 |
| Big Trucking Solutions Ltd | Transport & logistics | 2023 |
| Big UP World Ltd | Wholesale & retail | 2021 |
| Big Wave PR Limited | Professional & scientific | 2008 |
| Bigg Global Distribution Limited | Transport & logistics | 2025 |
| Bikini Boutique Limited | Manufacturing | 2017 |
| Bild Workwear Ltd | Professional & scientific | 2012 |
| Billingsgate Smoked Fish Ltd | Wholesale & retail | 2018 |
| Bilsing UK Limited | Administrative & support | 2006 |
| Bimi Ltd. | Administrative & support | 1993 |
| Bimony Limited | Health & social care | 2013 |
| Binary Edge Computing Ltd | Information & communication | 2025 |