| Binerix Ltd | Professional & scientific | 2009 |
| Bing IT Ltd | Information & communication | 2015 |
| Bing&Me Ltd | Extraterritorial | 2025 |
| Bingaglo Limited | Extraterritorial | 2025 |
| Bingoplace Limited | Wholesale & retail | 2026 |
| Binky Holdings Ltd | Real estate | 2018 |
| Binley Woods Service Station Limited | Wholesale & retail | 2020 |
| Binnen Ltd | Wholesale & retail | 2014 |
| Binnova Trading Ltd | Wholesale & retail | 2025 |
| Binoculars Direct Ltd | Wholesale & retail | 2024 |
| Binsanad Limited | Real estate | 2025 |
| Binswood Hall Management Company Limited | Real estate | 2008 |
| Bintang Homes Limited | Real estate | 2019 |
| BIO Balance Corporation Ltd | Wholesale & retail | 2024 |
| BIO Care for Trade Ltd | Wholesale & retail | 2021 |
| BIO Enterprise Ltd | Agriculture & fishing | 2020 |
| BIO Parc Concepts International Ltd | Professional & scientific | 2020 |
| Bio(Hk) Ltd | Manufacturing | 2023 |
| Bio-Functional-Foods.Com | Manufacturing | 2023 |
| Bio-Shape Ltd. | Professional & scientific | 2015 |
| Bioanalytical Partners Ltd | Professional & scientific | 2025 |
| Biocqv Consultant Limited | Professional & scientific | 2021 |
| Biodviser Ltd | Information & communication | 2021 |
| Biodynamics Agricultural Developments Limited | Professional & scientific | 2020 |
| Bioedit Limited | Information & communication | 2001 |
| Bioeurope Limited | Wholesale & retail | 2010 |
| Biogas Sales UK Limited | Wholesale & retail | 2022 |
| Biogenix Pharma International Ltd | Wholesale & retail | 2025 |
| Biohack Technologies Ltd | Wholesale & retail | 2024 |
| Biohacking Manchester Limited | Health & social care | 2022 |
| Biohatch Ltd | Professional & scientific | 2026 |
| Bioherb Food Supplements Trading Ltd | Manufacturing | 2025 |
| Bioid Hormones Limited | Health & social care | 2018 |
| Biolexicon Limited | Professional & scientific | 2024 |
| Biolin Scientific Limited | Manufacturing | 1983 |
| Biolink Limited | Wholesale & retail | 2006 |
| Biome Bloom Limited | Wholesale & retail | 2025 |
| Biomega Limited | Other services | 2024 |
| Bionat Australia PTY Ltd | Wholesale & retail | 2026 |
| BIONET14 Ltd | Wholesale & retail | 2026 |
| Bionicvale UK Limited | Financial services | 2014 |
| Bionik Strength Education Ltd | Education | 2023 |
| Bionik Strength HQ Ltd | Real estate | 2022 |
| Bionik Strength Ltd | Education | 2020 |
| Bionow Limited | Professional & scientific | 1999 |
| Biora Nature Tech Limited | Professional & scientific | 2024 |
| Biorelate Limited | Professional & scientific | 2014 |
| Bioschlafsofa Ltd | Manufacturing | 2024 |
| Bioscore Limited | Information & communication | 2025 |
| Biosimax Lifesciences Ltd | Manufacturing | 2024 |
| Biosphere Renewables Ltd | Manufacturing | 2025 |
| Biosurfactants Ltd | Professional & scientific | 2022 |
| Biotc Search Ltd | Administrative & support | 2025 |
| Bioticpro Limited | Wholesale & retail | 2025 |
| Biovance Ltd | Wholesale & retail | 2025 |
| Bioxydyn Limited | Professional & scientific | 2009 |
| Biqu Ltd | Wholesale & retail | 2024 |
| Biranase Healthcare Ltd | Health & social care | 2023 |
| Birbeck Limited | Wholesale & retail | 2025 |
| Birch Building Company Ltd | Wholesale & retail | 2019 |
| Birch Decorating Limited | Construction | 2021 |
| Birch Dental Laboratory Limited | Health & social care | 2015 |
| Birch Hollow Trading House Ltd | Extraterritorial | 2026 |
| Birch Park Investments Limited | Real estate | 1963 |
| Birch Portfolio LP | | 2023 |
| Birch Ridge Investment House Ltd | Extraterritorial | 2026 |
| Birch Shadow Consulting Solutions Ltd | Extraterritorial | 2026 |
| Birch Support Services Limited | Information & communication | 2016 |
| Birches RTM Company Ltd | Real estate | 2014 |
| Birchfield Fence Products Limited | Construction | 2012 |
| Birchfield House Management Co Limited | Households | 2019 |
| Birchfield North West Construction Ltd | Real estate | 2019 |
| Birchfield Property Ltd | Other services | 2018 |
| Birchford Holdings Ltd | Real estate | 2019 |
| Birchgate Property Company Limited | Households | 2022 |
| Birchhawk Limited | Real estate | 2026 |
| Birchloch Limited | Real estate | 2014 |
| Birchwood Construction Limited | Construction | 1988 |
| Birchwood Horizon Trading Solutions Ltd | Extraterritorial | 2026 |
| Birchwood Indian Cuisine Limited | Hospitality | 2025 |
| Birchwood Spice 53 Limited | Hospitality | 2021 |
| Birchwood Spice Limited | Hospitality | 2020 |
| Bird & Bear Limited | Real estate | 2022 |
| Bird ITH Cottages Limited | Transport & logistics | 2013 |
| Bird of Prey Ltd | Hospitality | 2024 |
| Bird Rides UK Limited | Transport & logistics | 2018 |
| Birdbox Brewery Ltd | Manufacturing | 2021 |
| Birdhaus MCR Ltd | Hospitality | 2026 |
| Birds Like Wires Ltd | Information & communication | 2016 |
| Birds of Prey Ltd | Hospitality | 2024 |
| Birdsystem Ltd | Extraterritorial | 2011 |
| Birght Path Investment Advisors Ltd | Extraterritorial | 2026 |
| Birght Path Realty Ltd | Extraterritorial | 2026 |
| Birkby One Limited | Construction | 2021 |
| Birkenhead Assets (NO 2) Ltd | Real estate | 2004 |
| Birkenhead Assets Ltd | Real estate | 2004 |
| Birley Fields Eateries Group Ltd | Hospitality | 2013 |
| Birmingham Enterprise Wharf Holdings Limited | Extraterritorial | 2021 |
| Birmingham Enterprise Wharf Limited | Construction | 2019 |
| Birmingham Estates Limited | Extraterritorial | 2015 |