| Bikboo Limited | Administrative & support | 2025 |
| Bike Exchange Limited | Wholesale & retail | 2026 |
| Bike Exchange Services Limited | Wholesale & retail | 2026 |
| Bike Vision Ltd | Information & communication | 2021 |
| BIKE2WORK Exclusive Limited | Wholesale & retail | 2018 |
| BIKE2WORK Scheme Limited | Wholesale & retail | 2012 |
| Bilal Food Limited | Hospitality | 2019 |
| Bilancia Art Limited | Arts & recreation | 2026 |
| Bilancia Capital Limited | Real estate | 2019 |
| Bilancia Commercial Investments Limited | Real estate | 2015 |
| Bilancia Consulting Limited | Professional & scientific | 2019 |
| Bilancia Gemelli Capital Limited | Real estate | 2020 |
| Bilboss (PVT) Ltd | Wholesale & retail | 2017 |
| Bill Forde Ltd | Information & communication | 2024 |
| Bill Owen Succession IHT Trading Limited | Professional & scientific | 2019 |
| Bill Standard Ltd | Construction | 2021 |
| Bill Walsh Electrical Maintenance Ltd | Construction | 2023 |
| Billington Agriculture Holdings Limited | Professional & scientific | 1938 |
| Billington Agriculture Limited | Professional & scientific | 2001 |
| Billington Food Ingredients Limited | Professional & scientific | 1989 |
| Billington Foods Dormant Limited | Professional & scientific | 1972 |
| Billington Foods Limited | Manufacturing | 1990 |
| Billington Foodservice Limited | Professional & scientific | 1987 |
| Billington Frozen Foods Limited | Professional & scientific | 1938 |
| Billington Group Limited | Professional & scientific | 1982 |
| Billington Profit Sharing Trust Limited | Administrative & support | 1939 |
| Billington Property Management Ltd | Real estate | 1974 |
| Billington SFT Limited | Professional & scientific | 1987 |
| Billionaire Juice Limited | Manufacturing | 2019 |
| Billionsfx Forex Course Ltd | Education | 2019 |
| Billionstarjojo Limited | Wholesale & retail | 2026 |
| Billo Ltd | Wholesale & retail | 2022 |
| Billons Ltd | Wholesale & retail | 2020 |
| Billstew Ltd | Administrative & support | 2017 |
| Billy Lynch Ltd | Construction | 2018 |
| Billy Property Limited | Real estate | 2021 |
| Billy Roberts Glazing Limited | Construction | 2011 |
| Billy's Pizza & Kebab Ltd | Hospitality | 2023 |
| Billy’S Dining Ltd | Hospitality | 2024 |
| Bilolah Limited | Health & social care | 2022 |
| Biltone Limited | Arts & recreation | 2005 |
| Biluta Transport Ltd | Wholesale & retail | 2018 |
| Bimi Fit Ltd | Arts & recreation | 2025 |
| Bimovation Limited | Construction | 2022 |
| BIN Akram Traders Limited | Wholesale & retail | 2026 |
| Bina Ltd | Wholesale & retail | 2024 |
| Bina Pathways Ltd | Administrative & support | 2025 |
| Binary Digital Creativ Limited | Professional & scientific | 2025 |
| Bingham Consulting Ltd | Construction | 2025 |
| Binghams Solutions Limited | Professional & scientific | 2022 |
| BINGO2U Limited | Arts & recreation | 2025 |
| BINGOLSANCAK20 Limited | Hospitality | 2025 |
| Binns Rainbow Trading Limited | Agriculture & fishing | 2015 |
| Binns Red Rose Trading Limited | Professional & scientific | 2017 |
| Binsoar Corp Ltd | Real estate | 2025 |
| BIO 365 Specialist Services Ltd | Administrative & support | 2025 |
| BIO Technics Limited | Manufacturing | 1995 |
| Bio-Oil Research Limited | Wholesale & retail | 1974 |
| Bio-Pep + UK Limited | Professional & scientific | 2026 |
| Bioclickr Limited | Information & communication | 2025 |
| BIOCODE9 Ltd | Wholesale & retail | 2024 |
| Biodeg Chemical Co Limited | Manufacturing | 1989 |
| Biograd Biobank Limited | Real estate | 2021 |
| Biograd Education Limited | Education | 2017 |
| Biograd Innovation Centre Limited | Real estate | 2022 |
| Biograd Limited | Education | 2014 |
| Biograd Pharma Limited | Professional & scientific | 2017 |
| Biograd School Trips Limited | Professional & scientific | 2017 |
| Biohabit Ltd | Manufacturing | 2019 |
| Bion Family Trading Limited | Professional & scientific | 2023 |
| Biosensia Limited | Professional & scientific | 2021 |
| Biosparx Ltd | Health & social care | 2026 |
| Biotise Ltd | Wholesale & retail | 2026 |
| Biowell Fitness Limited | Professional & scientific | 2023 |
| Birch Data Limited | Information & communication | 2021 |
| Birch Developments (NW) Ltd | Other services | 2014 |
| Birch Environmental (NW) Limited | Other services | 2018 |
| Birch House Close Management Co Limited | Households | 2017 |
| Birch House Developments Limited | Construction | 2010 |
| Birch House Estates Limited | Real estate | 2012 |
| Birchall Investments Ltd | Financial services | 2026 |
| Birchgear Ltd | Wholesale & retail | 2026 |
| Birchmoor Residents Association Limited | Hospitality | 1978 |
| Birchmors Property Management Ltd | Real estate | 2015 |
| Birdview Logistics Limited | Transport & logistics | 2025 |
| Bireli Aviation Ltd | Transport & logistics | 2026 |
| Birkdale Court (Liverpool) Investments Limited | Real estate | 2007 |
| Birkdale Court (Tarbock) Management Company Limited | Real estate | 2005 |
| Birkenhead Commercial Limited | Real estate | 2014 |
| Birkenhead Engine Exchange Ltd | Wholesale & retail | 2016 |
| Birkenhead Port Limited | Transport & logistics | 1994 |
| Birkenhead Units Limited | Real estate | 2010 |
| Birl Technology Ltd | Information & communication | 2022 |
| Birley Group Ltd | Administrative & support | 2024 |
| Birley's Garden Maintenance Ltd | Administrative & support | 2021 |
| Birmingham Cabs Ltd | Transport & logistics | 2002 |
| Birmingham Taxi Warehouse Limited | Extraterritorial | 2005 |
| Birtchley Ross Limited | Construction | 2014 |
| Bisbaas Sauce Ltd | Manufacturing | 2022 |
| Bish Bash Bosh Productions Ltd | Professional & scientific | 2022 |