| Beaufill Aesthetics Limited | Health & social care | 2024 |
| Beautiful View Limited | Construction | 1990 |
| Beauty MED Ltd | Other services | 2022 |
| Beauty Studio by Anita Ltd | Other services | 2025 |
| Beaver Garden Services Ltd | Construction | 2018 |
| Bebeto UK Development Limited | Manufacturing | 2013 |
| Bechir Property Ltd | Real estate | 2023 |
| Beckenham Limited | Real estate | 2020 |
| Becky Group Ltd | Construction | 2019 |
| Becky Logistics Ltd | Transport & logistics | 2022 |
| Bedfordshire Builders Ltd | Construction | 2025 |
| Bedfordshire Football Association Limited | Arts & recreation | 1999 |
| Bedlow Limited | Hospitality | 2015 |
| Beds and Herts Properties Limited | Real estate | 2017 |
| Beds Building Services Ltd | Construction | 2024 |
| Beds Electrical Ltd | Construction | 2024 |
| BEE & TEE Limited | Information & communication | 2007 |
| Beechfield Asset Management Limited | Administrative & support | 2013 |
| Beechwood Home Farm Limited | Agriculture & fishing | 1997 |
| Beechwood Park (Derby) Ltd | Hospitality | 2013 |
| Beecroft Academy | Education | 2013 |
| Beecroft Community Association | Arts & recreation | 2019 |
| Beef King Dunstable Ltd | Hospitality | 2025 |
| Beenus Ltd | Wholesale & retail | 2018 |
| Beetech Services Limited | Construction | 2015 |
| Beistand Ltd | Information & communication | 2025 |
| Belgrave Hotel Ltd. | Hospitality | 1998 |
| Belgrave UK Holdings Ltd | Real estate | 2021 |
| Belmont Safety Limited | Wholesale & retail | 2005 |
| Belmonta Services Ltd | Administrative & support | 2026 |
| BEN Reeve Commercials Limited | Wholesale & retail | 2007 |
| Beneacare Ltd | Health & social care | 2022 |
| Benfleet Limited | Administrative & support | 2024 |
| Bengal Chili Limited | Hospitality | 2025 |
| Benjaminbenjamin Limited | Construction | 2017 |
| Benmoussa Capital Ltd | Education | 2024 |
| Benmoussa Holdings Ltd | Wholesale & retail | 2024 |
| Bennett Property Developments Ltd | Real estate | 2022 |
| Bennett Property Services Ltd | Real estate | 2022 |
| Bennoc Ltd | Real estate | 2021 |
| Bentley Clinical Research Consulting Ltd | Professional & scientific | 2013 |
| Bentley Manor Limited | Hospitality | 2023 |
| Beorcmans Construction Limited | Construction | 2011 |
| Bermon Groundwork Limited | Construction | 2016 |
| Berto Company Ltd | Health & social care | 2018 |
| Bespoke Archive Digitisation Ltd | Information & communication | 2010 |
| Bespoke Barns Limited | Construction | 2011 |
| Bespoke Tuning & Diagnostics Ltd | Wholesale & retail | 2024 |
| Best and Less Enterprises Ltd | Wholesale & retail | 2022 |
| Best Estate Agent Guide Ltd | Professional & scientific | 2017 |
| Best Fitters Ltd | Construction | 2024 |
| Best Raffle Competitions Ltd | Arts & recreation | 2023 |
| Best Ways Security Ltd | Administrative & support | 2012 |
| Bestir Limited | Wholesale & retail | 2023 |
| Bestlink Construction Solutons Ltd | Administrative & support | 2013 |
| Beta UK Limited | Hospitality | 1999 |
| Bethel Lognon Care Services Ltd | Health & social care | 2020 |
| Between Two Worlds CIC | Education | 2026 |
| Beulah Collection Limited | Wholesale & retail | 2022 |
| BF Line Limited | Wholesale & retail | 2019 |
| Bf&D Limited | Construction | 2019 |
| BG Home Improvements (London) Limited | Construction | 2026 |
| BH Bikes Limited | Wholesale & retail | 2025 |
| Bhav Limited | Wholesale & retail | 2008 |
| Bianchi Limited | Health & social care | 2020 |
| Biasabri Limited | Transport & logistics | 2025 |
| Bida Construction Ltd | Construction | 2020 |
| Biddenham Limited | Hospitality | 2025 |
| Biddles Bar & Hospitality Ltd | Hospitality | 2025 |
| Biedatrans Ltd | Transport & logistics | 2025 |
| Biewerbay Ltd | Agriculture & fishing | 2021 |
| Big Bear Headwear Limited | Wholesale & retail | 2022 |
| Big City Security Ltd | Administrative & support | 2010 |
| Big D'S Tyres Ltd | Wholesale & retail | 2021 |
| Big Florin Ltd | Construction | 2024 |
| Big Ugly Properties Ltd | Real estate | 2026 |
| Biggs Beit Ltd | Health & social care | 2014 |
| Binary-Solutions-Worldwide Ltd | Information & communication | 2009 |
| Bingo Jamz London Ltd | Hospitality | 2025 |
| Bingo Jamz UK Ltd | Hospitality | 2024 |
| Biona-Sphere Ltd | Education | 2023 |
| BIR Home Services Ltd | Construction | 2020 |
| Birchwood Gardens Ltd | Administrative & support | 2023 |
| Bishop Maintenance UK Ltd | Other services | 2026 |
| Bistro Bliss Limited | Hospitality | 2024 |
| Bitspro Limited | Information & communication | 2022 |
| BJW Property Services Ltd | Real estate | 2020 |
| BL Automotive Ltd | Wholesale & retail | 2019 |
| Black Beard Brothers Ltd | Construction | 2022 |
| Black Cat Travel Cottages Limited | Hospitality | 2009 |
| Black SHU Limited | Construction | 2017 |
| Blackbird and Robin Limited | Real estate | 2023 |
| Blackrock Projects Limited | Construction | 2023 |
| Blackstar Chauffeur Limited | Transport & logistics | 2021 |
| Blackstone Residential Ltd | Real estate | 2025 |
| Blacktower Limited | | 1975 |
| Blanchard Flooring Limited | Construction | 2019 |
| Blanctec Electrical Limited | Construction | 2016 |
| Blessed Three Investments Ltd | Real estate | 2025 |
| Blissful Staycation Ltd | Real estate | 2024 |