| Baldwins Lane Limited | Health & social care | 2022 |
| Bali Secrets Ltd | Wholesale & retail | 2016 |
| Ballin One CIC | Education | 2021 |
| Bally Properties Limited | Real estate | 2007 |
| Balona Limited | Households | 1974 |
| Bambi Properties Midlands Limited | Financial services | 2018 |
| Bandstand Merchandise Services Ltd | Wholesale & retail | 2021 |
| Bane and Finch Ltd | Professional & scientific | 2017 |
| Bangla Cuisine Solihull Limited | Hospitality | 2022 |
| Bangla Station Wholesale Limited | Wholesale & retail | 2001 |
| Banglo Investors Limited | Construction | 2018 |
| Banjol Company Limited | Real estate | 2018 |
| Bankside (Acocks Green) Management Company Limited | Households | 2005 |
| Banner Carpentry & Joinery Ltd | Construction | 2018 |
| Banner Joinery Ltd | Manufacturing | 2021 |
| Baomere Ltd | Professional & scientific | 2019 |
| Bappag Tradings Ltd | Wholesale & retail | 2025 |
| Bar Fever (Aylesbury) Ltd | Hospitality | 2012 |
| Bar Fever (Barnstaple) Ltd | Hospitality | 2012 |
| Bar Fever (Cannock) Ltd | Hospitality | 2017 |
| Bar Fever (Fleet) Ltd | Hospitality | 2014 |
| Bar Fever (Isle of Wight) Ltd | Hospitality | 2016 |
| Bar Fever (Lincoln) Ltd | Hospitality | 2016 |
| Bar Fever (Nuneaton) Ltd | Hospitality | 2009 |
| Bar Fever (Southend) Ltd | Hospitality | 2018 |
| Bar Fever (Taunton) Ltd | Hospitality | 2013 |
| Bar Fever Limited | Hospitality | 2009 |
| Bar Holdings Limited | Hospitality | 2008 |
| Barad Management Ltd | Professional & scientific | 2020 |
| Barakah Capital Investments Ltd | Real estate | 2025 |
| Barakat Clothing Ltd | Manufacturing | 2025 |
| Barber 93 Ltd | Other services | 2024 |
| Barber-Hewitt Consultancy Ltd | Professional & scientific | 2026 |
| Barcelona Tennis Centre UK Ltd | Education | 2016 |
| Barclay-Jones Associates Limited | Information & communication | 2009 |
| Barclub (Lincoln) Limited | Hospitality | 2012 |
| Bardell Electrical Limited | Construction | 2024 |
| Barefoot Psychics UK Ltd | Other services | 2024 |
| Baretto Steps Limited | Health & social care | 2016 |
| Bargain Tiles Birmingham Co Ltd | Wholesale & retail | 2026 |
| Bark Property Ltd | Real estate | 2017 |
| Barker and Lovett Portfolios Ltd | Real estate | 2016 |
| Barkers Engineering Limited | Manufacturing | 1958 |
| Barley PUB Company Limited | Hospitality | 2007 |
| Barlows Logistics Limited | Transport & logistics | 2025 |
| Barnett-Coxon Property Limited | Real estate | 2022 |
| Barnston Interiors Limited | Other services | 2020 |
| Baronet Communications Limited | Administrative & support | 2009 |
| Barons Castle Limited | Administrative & support | 1999 |
| Barrow & Parker Ltd | Professional & scientific | 2015 |
| Barrows Lane Developments Limited | Real estate | 2006 |
| Bartestree Grange Management Company Limited | Households | 2018 |
| Bartlett Installations Ltd | Construction | 2019 |
| Bartlett International Limited | Real estate | 1974 |
| Bartley's Estate Agents Ltd | Real estate | 2006 |
| Barton Estate Management Limited | Real estate | 2025 |
| Barton Quarter (Nottingham) Limited | Construction | 2024 |
| Bartorc Ltd | Professional & scientific | 2012 |
| Baruaeyes Limited | Health & social care | 2017 |
| Basedhealth Ltd | Professional & scientific | 2023 |
| Basem Muammar Limited | Health & social care | 2017 |
| Basement Inc Limited | Hospitality | 2021 |
| Baset Housing Limited | Real estate | 2022 |
| Bash Properties UK Ltd | Real estate | 2019 |
| Basket Buddies Ltd | Arts & recreation | 2024 |
| Bass HQ Limited | Arts & recreation | 2018 |
| Bastock & Bruce Limited | Other services | 2019 |
| Batchelor Pads Ltd | Real estate | 2021 |
| Batheability UK Ltd | Construction | 2025 |
| Batteryware Limited | Manufacturing | 2019 |
| Baume Ltd | Professional & scientific | 2022 |
| Baxter Charles Limited | Professional & scientific | 2011 |
| Bay Leaf Investment Properties Limited | Real estate | 2019 |
| Bay Restaurant Group Limited | Hospitality | 2007 |
| Bayti Residential Ltd | Real estate | 2025 |
| Bazaar Boost Ltd | Wholesale & retail | 2025 |
| Bazet Limited | Real estate | 2024 |
| BB Excellency Properties Limited | Real estate | 2026 |
| BB Treasury UK Limited | Professional & scientific | 2026 |
| BBB Contracts Limited | Construction | 2025 |
| BBK Solutions Ltd | Construction | 2021 |
| BC Alliance Ltd | Construction | 2025 |
| BCA Parking Services Limited | Extraterritorial | 2025 |
| BCB Commercial Solutions Ltd | Administrative & support | 2025 |
| BCD19 Services Ltd | Professional & scientific | 2019 |
| BCH Services Ltd | Transport & logistics | 2016 |
| BCS Audio Limited | Extraterritorial | 2012 |
| BCS Manufacturing Limited | Extraterritorial | 2013 |
| Bcscon Ltd | Professional & scientific | 2024 |
| BE at One Holdings Limited | Hospitality | 2011 |
| BE at One Limited | Hospitality | 2000 |
| BE Natural Products Limited | Manufacturing | 2004 |
| BE OUR Guest Catering Ltd | Hospitality | 2024 |
| BE Permanently Beautiful Ltd | Health & social care | 2016 |
| BE Real Estate Management Limited | Real estate | 2024 |
| BE Trained Limited | Administrative & support | 2024 |
| Be-Yourself-Art Ltd | Extraterritorial | 2022 |
| Beach Group Limited | Professional & scientific | 2017 |
| Bealux Homes Limited | Real estate | 2017 |
| Beamin Limited | Professional & scientific | 2022 |