| Belgravia House Management Company Limited | Households | 1998 |
| Beli Group Ltd | Construction | 2023 |
| Believers Eastern Church UK | Other services | 2020 |
| Belife Ltd | Information & communication | 2006 |
| Belinda Coaten Ltd | Professional & scientific | 2018 |
| Bell Davies Drive (Manston) Residents Company Limited | Other services | 2024 |
| Bell Group (Europe) Ltd | Manufacturing | 2015 |
| Bell Installations & Building Limited | Construction | 2012 |
| Bell IT Services Ltd | Information & communication | 2026 |
| Bell Stone Associates Limited | Professional & scientific | 2005 |
| Bell X Hercules Group Limited | Wholesale & retail | 2025 |
| Bella (Peterborough) Ltd | Administrative & support | 2019 |
| Bella Bodies Australia Ltd | Wholesale & retail | 2023 |
| Bella Homes Ltd | Real estate | 2017 |
| Bella Regia Ltd | Construction | 2024 |
| Bella's Pizza Express Limited | Extraterritorial | 2016 |
| Bella, BEA and ME Limited | Real estate | 2025 |
| Bellairs Consultancy Ltd | Professional & scientific | 2026 |
| Bellavie Homes Ltd | Real estate | 2024 |
| Belle and Beqster Enterprises Ltd | Wholesale & retail | 2012 |
| Belle Blush Limited | Other services | 2014 |
| Bellee Ltd | Wholesale & retail | 2025 |
| Bellerr Ltd | Information & communication | 2023 |
| Bellevie Property Ltd | Real estate | 2024 |
| Bellfair Properties Ltd | Real estate | 2017 |
| Bellfair Property Lettings Ltd | Real estate | 2025 |
| Bello Recovery Ltd | Water & waste | 2025 |
| Bellview Products Limited | Manufacturing | 2011 |
| Bellwether Wines Ltd | Wholesale & retail | 2009 |
| Belmark Builders Limited | Construction | 2007 |
| Belmont Contractors Ltd | Construction | 2013 |
| Belmont Farming Limited | Agriculture & fishing | 2011 |
| Belmont Heritage Limited | Construction | 2025 |
| Belmont Places Ltd | Real estate | 2023 |
| Belmont Stables & Grazing Ltd | Administrative & support | 2019 |
| Belsize Community Centre Ltd | Arts & recreation | 2025 |
| Belsize Developments Ltd. | Construction | 2001 |
| Belvoir Architecture Ltd | Professional & scientific | 2021 |
| Bema Lettings Ltd | Real estate | 2024 |
| BEN Goymour Ltd | Arts & recreation | 2020 |
| BEN Maxwell Creations Ltd | Manufacturing | 2022 |
| BEN Reeves Creative Limited | Arts & recreation | 2025 |
| Ben.Detailing Ltd | Wholesale & retail | 2025 |
| Benatitsec Ltd | Transport & logistics | 2024 |
| Benbow Haulage Ltd | Transport & logistics | 2025 |
| Benefield Court Oundle Management Company Limited | Real estate | 2008 |
| Benevo Limited | Wholesale & retail | 2025 |
| Beniko Limited | Transport & logistics | 2025 |
| Benjamin Rowcliffe Limited | Administrative & support | 2018 |
| Benjamin Travel T/A Asia Limited | Professional & scientific | 2017 |
| Benjamin Travel UK Limited | Transport & logistics | 2015 |
| Bennett Leisure Limited | Hospitality | 1999 |
| Bennetts Motorcycling Holdings Limited | Financial services | 2019 |
| Bentley Street Consulting Ltd | Professional & scientific | 2018 |
| Benzii Ltd | Wholesale & retail | 2018 |
| Beracha Business Ventures Ltd | Hospitality | 2026 |
| Berech Ltd | Extraterritorial | 2022 |
| Berg Sbke Limited | Wholesale & retail | 2016 |
| Berg Solutions Ltd | Professional & scientific | 2019 |
| Bergamo Associates Limited | Professional & scientific | 2014 |
| Bergmartin Limited | Wholesale & retail | 2025 |
| Berleyvista Care Support Services Ltd | Health & social care | 2023 |
| Berlin Haulage Ltd | Transport & logistics | 2022 |
| Bernardag Limited | Other services | 2016 |
| Bernie Tyson Building Supplies Solutions Ltd | Wholesale & retail | 2020 |
| Berre Home Furniture Limited | Wholesale & retail | 2023 |
| Berry Composite Ltd | Manufacturing | 2024 |
| Berus Trans Limited | Transport & logistics | 2014 |
| Bespoke Forestry Ltd | Agriculture & fishing | 2023 |
| Bespoke GB Limited | Construction | 2008 |
| Bespoke Lets Ltd | Real estate | 2025 |
| Bespoke Mortgage and Finance Centre Limited | Real estate | 2009 |
| Bespoke Realtors Ltd | Real estate | 2024 |
| Bespoke Stamford Limited | Education | 2025 |
| Bespokeluxuryrealestate Limited | Real estate | 2025 |
| Best Cleanliness Ltd | Administrative & support | 2024 |
| Best Contract Furniture Ltd | Wholesale & retail | 2015 |
| Best International Transport Ltd | Transport & logistics | 2021 |
| Best Travel and Hotels Ltd | Administrative & support | 2016 |
| Beta Bathroom & Powerflush Ltd | Construction | 2018 |
| Beta Connections Limited | Wholesale & retail | 2025 |
| Betarange Holdings Limited | Financial services | 2025 |
| Betarange Limited | Hospitality | 1977 |
| Betel Construction Incorporation Ltd | Construction | 2025 |
| Betex Europe Limited | Other services | 2020 |
| Bethany Morrell Ltd | Hospitality | 2023 |
| Bethel Developments Ltd | Construction | 2023 |
| Betsys RAW Food Limited | Manufacturing | 2017 |
| Bettaland Limited | Real estate | 2026 |
| Bettaland Products Limited | Wholesale & retail | 2003 |
| Better Nest Limited | Financial services | 2023 |
| Better Renting Limited | Information & communication | 2009 |
| Better Salon Supplies Limited | Other services | 2018 |
| Bettles Property Limited | Financial services | 2015 |
| Bettor Group Limited | Education | 2025 |
| BEV and Van Limited | Construction | 2008 |
| Bevcraft Limited | Administrative & support | 2018 |
| Bevelwood Management Limited | Households | 1985 |
| Bewar Nerway Ltd | Construction | 2023 |
| BEX Edwards Gardening Ltd | Wholesale & retail | 2025 |