| Barrett TM Ltd | Construction | 2024 |
| Barries Ices Ltd | Wholesale & retail | 1986 |
| Bartfilm (NA) Ltd | Information & communication | 2025 |
| Barton (Richmondshire) Playing-Field Limited | Arts & recreation | 2000 |
| Based on a True Story Limited | Administrative & support | 2016 |
| Bash and Blow Ltd | Other services | 2023 |
| Basque Cycling Escapes Ltd | Administrative & support | 2023 |
| Bassani & Skates Ltd | Hospitality | 2021 |
| Basu Associates Limited | Professional & scientific | 2021 |
| Baxter House Consultants Ltd | Professional & scientific | 2016 |
| Baxter House Limited | Wholesale & retail | 2016 |
| Bayleafstay Limited | Information & communication | 2023 |
| Bayloft Limited | Real estate | 1999 |
| Bazooka Candy Brands International Limited | Wholesale & retail | 2010 |
| BBB Garden Maintenance Limited | Administrative & support | 2003 |
| Bbinfinkle Ltd | Wholesale & retail | 2022 |
| BC Holdco Ltd | Professional & scientific | 2023 |
| BC International Consultancy Ltd. | Professional & scientific | 2021 |
| BCJ Estates Ltd | Real estate | 2020 |
| BCS Family Limited | Financial services | 2025 |
| BDE Supplements Ltd | Wholesale & retail | 2025 |
| BE in the Cloud Ltd | Information & communication | 2024 |
| Beacon Venture Holdings Limited | Wholesale & retail | 2024 |
| Beal Holdings North East Limited | Financial services | 2024 |
| Bealeline Distribution Ltd | Transport & logistics | 2021 |
| Bealhomes North East Limited | Construction | 2024 |
| Bear & Pard Marine Consultants Ltd | Professional & scientific | 2024 |
| Bear Capital Group Limited | Financial services | 2019 |
| Bear Cevis Limited | Professional & scientific | 2010 |
| Bear in Mind Audio Visual Ltd | Construction | 2021 |
| Beaton-Davies Limited | Information & communication | 2017 |
| Beau Buildings Ltd | Real estate | 2016 |
| Beaufighter Investments Ltd | Real estate | 2024 |
| Beauty Beat Communications Limited | Administrative & support | 2019 |
| Beauty Talk Limited | Other services | 2023 |
| Beautyline Limited | Manufacturing | 2016 |
| Beck Hill Farm Limited | Agriculture & fishing | 1974 |
| Beckenham & Penge Motor Co. Limited | Real estate | 1975 |
| Beckside Properties Limited | Real estate | 1987 |
| Bedford Camberley Ltd | Professional & scientific | 2023 |
| BEE Free Box Ltd | Hospitality | 2015 |
| BEE Tree Services Limited | Agriculture & fishing | 1996 |
| Beeblend Ltd | Wholesale & retail | 2025 |
| Beeblesoft Ltd | Information & communication | 2015 |
| Beechrow Residents Association Limited | Households | 1960 |
| Beechwood Homes (High Coniscliffe) Limited | Construction | 2007 |
| Beechwood Homes (Richmond) Limited | Construction | 2016 |
| Beechwood Project Management North East Limited | Administrative & support | 2006 |
| Befit Assured Tenancy Limited | Real estate | 1989 |
| Beforehold Limited | Real estate | 1992 |
| Begame Digital Limited | Information & communication | 2016 |
| Being Intentional Limited | Professional & scientific | 2025 |
| Bejewelled EYE Ltd | Hospitality | 2007 |
| Belgotha Limited | Professional & scientific | 2011 |
| Belintech Limited | Wholesale & retail | 2008 |
| Bell & Beau Image and Style Limited | Wholesale & retail | 2019 |
| Bell Yard Chambers Ltd | Professional & scientific | 2019 |
| Bellchambers Carpentry Ltd | Manufacturing | 2025 |
| Bellomont Residents Association Limited | Real estate | 1991 |
| Bellshill Lark (Number 21) Limited | Manufacturing | 2002 |
| Bellwether London Ltd | Wholesale & retail | 2018 |
| Belly Bliss Ltd | Hospitality | 2026 |
| Belskye Design Studio Ltd | Professional & scientific | 2023 |
| BEN Pulman Productions Limited | Information & communication | 2017 |
| BEN Stones Ltd | Information & communication | 2024 |
| Bendy Chick Limited | Information & communication | 2018 |
| Bene Luce Ltd | Professional & scientific | 2020 |
| Benira Investments Ltd | Financial services | 2024 |
| Benira Ltd | Financial services | 2023 |
| Benira Residential Ltd | Households | 2025 |
| Bentley Asset Holdings Limited | Financial services | 2025 |
| Benty Close Limited | Extraterritorial | 2012 |
| Berber Leather Ltd | Wholesale & retail | 2015 |
| Berchwood Partners LLP | | 2005 |
| Berenity Ltd | Wholesale & retail | 2025 |
| Bergladen Group Limited | Wholesale & retail | 2023 |
| Bergstrom IT Development Ltd | Information & communication | 2018 |
| Bergstrom Niska Medical Ltd | Health & social care | 2019 |
| Berlioz Enterprises Ltd | Construction | 2025 |
| Besa 2012 Ltd | Hospitality | 2023 |
| Bespoke Profiles Limited | Construction | 2024 |
| Best Care Group Ltd | Health & social care | 2024 |
| Best NCM Cleaning & Valeting Services Ltd | Administrative & support | 2017 |
| Best Workplaces Limited | Professional & scientific | 2022 |
| Bestcom International Ltd | Wholesale & retail | 2021 |
| Beta Gayrimenkul Ltd | Real estate | 2023 |
| Beta Technologies INT Ltd | Wholesale & retail | 2016 |
| Better ME Travel Ltd | Administrative & support | 2025 |
| Beverly Hills Trading Limited | Professional & scientific | 2009 |
| BEX London Ltd | Manufacturing | 2011 |
| Beyerskloof Limited | Real estate | 2015 |
| BF Hair KEW Limited | Other services | 2026 |
| Bhaavya Ltd | Professional & scientific | 2026 |
| BHJ Investments (North East) Ltd | Real estate | 2017 |
| Bhuti London Ltd | Hospitality | 2022 |
| Bicycle Limited | Wholesale & retail | 2007 |
| Bifora Ltd | Information & communication | 2014 |
| Big Airways Ltd | Administrative & support | 2024 |
| Big Daddy Equipment Ltd | Wholesale & retail | 2024 |
| Big Holidays Ltd | Administrative & support | 2024 |