| Bempirecollectionz Ltd | Wholesale & retail | 2023 |
| Bencliff Innovations Ltd | Wholesale & retail | 2020 |
| Bengal Tiger Security Services Ltd | Administrative & support | 2026 |
| Beni Builders London Limited | Construction | 2015 |
| Benish Constructions Limited | Administrative & support | 2022 |
| Benjames Developments Limited | Professional & scientific | 2010 |
| Benjamin Alon Shaw Limited | Administrative & support | 2023 |
| Benjamin Property Services Ltd | Construction | 2026 |
| Benjamin Stevens Auctions Limited | Real estate | 2023 |
| Benjamin Stevens Block (TAB) Limited | Real estate | 2024 |
| Benjamin Stevens Block Management Ltd | Households | 2023 |
| Benjamin Stevens Estate Agents Limited | Real estate | 2023 |
| Benneh Ltd | Health & social care | 2022 |
| Bennetts Field Residents Management Company Limited | Real estate | 2007 |
| Benny's Building Services Limited | Construction | 2017 |
| Bensgroup Limited | Construction | 2025 |
| Benson Rail Services Ltd | Construction | 2024 |
| Benten Worldwide Limited | Professional & scientific | 2019 |
| Benweed Limited | Professional & scientific | 2015 |
| Bepharm Ltd | Wholesale & retail | 2025 |
| Berby Ltd | Manufacturing | 2016 |
| Beresford Hotels Ltd | Real estate | 2023 |
| Berezo Limited | Hospitality | 2019 |
| Beris Group Ltd | Wholesale & retail | 2026 |
| Berkarar Limited | Hospitality | 2019 |
| Berkeley Court (Freehold) Limited | Households | 2003 |
| Berkeley House Edgware Limited | Households | 2018 |
| Berkeley Square Associates Ltd. | Professional & scientific | 2020 |
| Berkeley Square Residential Ltd | Real estate | 2018 |
| Berkley Court Residents' Association Limited | Households | 1979 |
| Berla Ltd | Health & social care | 2019 |
| Bert's Fish Bar Ltd | Hospitality | 2023 |
| Bertas Limited | Professional & scientific | 2006 |
| Besmara Limited | Professional & scientific | 2022 |
| Bespoke Dental Lounge Ltd | Health & social care | 2018 |
| Bespoke Performance Limited | Professional & scientific | 2010 |
| Bespoketraveln Ltd | Construction | 2020 |
| Best & Best International Ltd | Wholesale & retail | 2021 |
| Best & Co. Legal Ltd | Professional & scientific | 2025 |
| Best (Insurance) Services Limited | Financial services | 2005 |
| Best IM Services Ltd | Transport & logistics | 2015 |
| Best London Recovery Ltd | Transport & logistics | 2026 |
| Best Painting Interiors Ltd | Education | 2016 |
| Best Skyline Ltd | Manufacturing | 2019 |
| Best Style Driveways & Patios Limited | Construction | 2023 |
| Best Style Linens Ltd | Wholesale & retail | 2023 |
| Besting Limited | Administrative & support | 2008 |
| Better Health Solutions (London) Limited | Health & social care | 2024 |
| Betteringconsultants Ltd | Education | 2024 |
| Beverley Clinic Limited | Health & social care | 2024 |
| Beyond Bliss Ltd | Wholesale & retail | 2025 |
| Beyond Measures Property Limited | Real estate | 2026 |
| BF Developments Limited | Construction | 2013 |
| BFA Railway Limited | Construction | 2017 |
| Bfit Online Ltd | Other services | 2023 |
| Bg&L Transport Limited | Transport & logistics | 2022 |
| Bhadrakali Limited | Administrative & support | 2022 |
| Bhai Jaan Limited | Wholesale & retail | 2022 |
| Bhajo Limited | Financial services | 2025 |
| Bharti Limited | Health & social care | 2010 |
| Bhatt Properties Ltd | Real estate | 2018 |
| Bhavna Ltd | Wholesale & retail | 2025 |
| Bhavya's Leisure Private Limited | Administrative & support | 2015 |
| BHE Services Limited | Other services | 2023 |
| Bhimjiyani Properties (2025) Limited | Construction | 2025 |
| Bhravan DA Dhaba Limited | Hospitality | 2024 |
| Bhto Ltd | Manufacturing | 2015 |
| Bhuptani Properties Limited | Real estate | 2022 |
| Bhuva & Bhuva Property Investments Ltd | Real estate | 2024 |
| Biageo Ltd | Other services | 2008 |
| Bianca Gidwani Limited | Professional & scientific | 2023 |
| Bica Construction Limited | Construction | 2015 |
| Bidar Global Trading Group Ltd | Wholesale & retail | 2023 |
| Biddingmax Limited | Other services | 2008 |
| BIF Investments Limited Liability Partnership | | 2006 |
| BIF Properties (UK) Limited | Administrative & support | 2006 |
| Big ALL Ltd | Construction | 2018 |
| Big Brains Tuition Limited | Education | 2013 |
| Big Brisket Limited | Financial services | 2021 |
| Big Brother UK Limited | Construction | 2006 |
| Big Hungry HUT Ltd | Hospitality | 2025 |
| Bigbuild Limited | Real estate | 2017 |
| Biggles House Limited | Real estate | 2021 |
| Bijlani Consulting Limited | Health & social care | 2006 |
| Bikur Cholim Edgware Ltd | Administrative & support | 2021 |
| Bilal Real Estate Ltd | Real estate | 2025 |
| Bilalcan Ltd | Hospitality | 2019 |
| Bildomo Limited | Professional & scientific | 2023 |
| Bilha Services Limited | Construction | 2013 |
| Billc Property Ltd | Real estate | 2018 |
| Biluc UK Ltd | Transport & logistics | 2020 |
| BIO Pure Air Ltd | Water & waste | 2017 |
| Biosyn Fusion Ltd | Manufacturing | 2025 |
| Biovanta Ltd | Professional & scientific | 2025 |
| Birchmead Homes Limited | Construction | 2012 |
| Birchos Yosef (UK) Limited | Other services | 2007 |
| BIS Group Limited | Real estate | 2021 |
| Bissoboutique Ltd | Wholesale & retail | 2026 |
| Bite for Delight Ltd | Hospitality | 2018 |
| Bitmore Limited | Manufacturing | 2011 |