| Bestgreat Ltd | Real estate | 2000 |
| Bestnes Ltd | Transport & logistics | 2015 |
| Bestone News & Grocers Ltd | Wholesale & retail | 2018 |
| Bestsapcons UK Ltd | Information & communication | 2015 |
| Bestwood Nottingham SPV Limited | Real estate | 2025 |
| BETA3 Productions Ltd | Information & communication | 2024 |
| Beth Hamidrash Zichron Yechezkel Limited | Other services | 2022 |
| Bethel Apostolic ARK Church | Other services | 1999 |
| Bethel Community College Ltd | Education | 1998 |
| Bethel Productions Limited | Information & communication | 2015 |
| Betizen Limited | Arts & recreation | 2022 |
| Betn Ltd | Hospitality | 2024 |
| Better Housing Ltd | Real estate | 2024 |
| Better Studies Limited | Real estate | 2023 |
| Betternotstop Ltd | Arts & recreation | 2018 |
| Bettertop Ltd | Households | 2019 |
| Beul Ltd | Administrative & support | 2025 |
| Beulah Management Company Limited | Households | 2021 |
| Bevan Engineering Services Ltd | Construction | 2025 |
| Bevendon Square Ltd | Real estate | 2025 |
| Bevolve Ltd | Real estate | 2020 |
| Bextor Estates Ltd | Extraterritorial | 2014 |
| Beycorp Ltd | Wholesale & retail | 2025 |
| Beyond DNA Ltd | Professional & scientific | 2022 |
| Beyond Residential Limited | Real estate | 2012 |
| Beyondcomparison.Com Limited | Financial services | 2012 |
| Beyondp Limited | Financial services | 2025 |
| Bezh LNB Ltd | Real estate | 2021 |
| Bfree Services Limited | Information & communication | 2020 |
| BG Consultancy Services Ltd | Professional & scientific | 2024 |
| BGE Ltd | Professional & scientific | 2026 |
| BGM Fierce Ltd | Real estate | 2025 |
| Bgreen Holdings Ltd | Professional & scientific | 2025 |
| BH Eleven Ltd | Professional & scientific | 2005 |
| BH Estate (M/C) Ltd | Real estate | 2020 |
| BH Investments MCR Ltd | Real estate | 2021 |
| BH Nine Ltd | Professional & scientific | 2005 |
| BH Property (MCR) Ltd | Real estate | 2023 |
| Bharwaney Consultancy Ltd | Other services | 2025 |
| Bhcy Ltd | Real estate | 2026 |
| BHM Estates Ltd | Real estate | 2019 |
| Bhnetw Ltd | Information & communication | 2024 |
| BHT Commercials Salford Ltd | Manufacturing | 2024 |
| Biandco Limited | Hospitality | 2025 |
| Bibi Beauty Zone Ltd | Other services | 2026 |
| Bickershaw Assets 2 Ltd | Extraterritorial | 2017 |
| Bickershaw Assets Ltd | Extraterritorial | 2017 |
| Bickershaw Greental Investments Ltd | Real estate | 2022 |
| Bids International Ltd | Professional & scientific | 2023 |
| Bidwell Henderson Costs Consultants Ltd | Professional & scientific | 2014 |
| Bies Ruchel School CC Limited | Health & social care | 2024 |
| Bieszczady Culture and Education Centre CIC | Education | 2025 |
| Big Easy Services Limited | Construction | 2016 |
| Big Gyros Ltd | Hospitality | 2022 |
| Big Steps Childcare Ltd | Administrative & support | 2010 |
| Bigger Boat Group Limited | Hospitality | 2022 |
| Bigraycutz Ltd | Other services | 2024 |
| Biler Messenger Service Ltd | Transport & logistics | 2021 |
| Bill Wright Film & Photography Limited | Professional & scientific | 2023 |
| Bilpark Holdings Limited | Real estate | 2024 |
| Bilpark SUB Limited | Real estate | 2024 |
| Binary Intellect Holdings Ltd | Financial services | 2024 |
| Binary Intellect Investments Ltd | Real estate | 2021 |
| Binbil Universal Concept Limited | Manufacturing | 2024 |
| Binks Creative Limited | Professional & scientific | 2025 |
| Binyan AD Ltd | Real estate | 2025 |
| Binyan ADI AD Ltd | Real estate | 2021 |
| Bioexec Search Ltd | Professional & scientific | 2025 |
| Bionovi Ltd | Professional & scientific | 2024 |
| Biopharma Legal Consulting Limited | Professional & scientific | 2024 |
| Bioscentix Ltd | Professional & scientific | 2025 |
| Bipfree Limited | Professional & scientific | 2012 |
| Birch Tree Investments Limited | Real estate | 2014 |
| Birch Worldwide Limited | Other services | 2002 |
| Birchfield Properties Limited | Real estate | 2019 |
| Birds Bakes Ltd | Wholesale & retail | 2020 |
| Birkdale Village Estates Limited | Professional & scientific | 2023 |
| Birkenshaw Securities Limited | Real estate | 2023 |
| Birthwise MCR Ltd | Education | 2026 |
| Birwood Properties Ltd | Professional & scientific | 1999 |
| Bisdo Ltd | Real estate | 2023 |
| Bishopshill Ltd | Construction | 2017 |
| Bishopsroad Limited | Real estate | 2020 |
| Bispham House Management Company Limited | Households | 2010 |
| Bistro Tapas Ltd | Hospitality | 2020 |
| Biswas Music Limited | Arts & recreation | 1988 |
| Bitachon Ltd | Administrative & support | 2009 |
| Bitesize Consultancy Services Limited | Health & social care | 2015 |
| Bitochen Ltd | Real estate | 2019 |
| Bits Dynamics Ltd | Information & communication | 2021 |
| Bits N Cloudz Ltd | Wholesale & retail | 2023 |
| Bits'N'Bobs Ltd | Extraterritorial | 2003 |
| Bituchen Ltd | Real estate | 2026 |
| BJ Projects Limited | Real estate | 2026 |
| Bj's Juke Joints London Limited | Hospitality | 2022 |
| Bjdn Limited | Real estate | 2024 |
| BJG Ventures Ltd | Professional & scientific | 2024 |
| BJW Project Services Limited | Professional & scientific | 2015 |
| Bj’S Country Club Limited | Hospitality | 2024 |
| BK (UK) Company Limited | Hospitality | 2013 |