| B Team Limited | Construction | 2007 |
| B&A Matei Ltd | Administrative & support | 2021 |
| B&C Commissioning and Validation Ltd | Construction | 2025 |
| B&G Limited | Health & social care | 2013 |
| B&G Motors Limited | Wholesale & retail | 2006 |
| B&N Logistics Ltd | Transport & logistics | 2025 |
| B&R Property Holdings Limited | Real estate | 2021 |
| B'Loonies Ltd | Wholesale & retail | 2025 |
| B.O.G. Car Valeting Ltd | Wholesale & retail | 2024 |
| B.S.O.E Ltd | Education | 2014 |
| B2B Automotive Limited | Other services | 2015 |
| B4M Group Limited | Health & social care | 2015 |
| B4M Property Limited | Real estate | 2018 |
| B4M Software Limited | Information & communication | 2017 |
| Babra Limited | Health & social care | 2023 |
| Baby Bell Productions Limited | Administrative & support | 2010 |
| Baby Force Ltd | Wholesale & retail | 2017 |
| Back and Sports Injury Clinic Ltd | Health & social care | 2021 |
| Back Home Limited | Real estate | 2017 |
| Backprop Limited | Information & communication | 2017 |
| BAD Monday Limited | Manufacturing | 2018 |
| BAD ROW Films Ltd | Information & communication | 2025 |
| Bade-Joko Limited | Real estate | 2021 |
| Badfish Labs Ltd | Information & communication | 2018 |
| Bador Social Limited | Administrative & support | 2026 |
| Bagsy Finacc Solutions Limited | Information & communication | 2013 |
| Baig & Baig Properties Ltd | Real estate | 2025 |
| Bailey Residential Property Ltd | Professional & scientific | 2024 |
| Bait and Tackle Shack Ltd | Wholesale & retail | 2026 |
| Bajwa & Daughters Ltd. | Administrative & support | 2018 |
| Bakers Instrument Brokers Limited | Wholesale & retail | 2000 |
| Bakery Covent Garden Limited | Wholesale & retail | 2011 |
| Baki Medica Ltd | Health & social care | 2022 |
| Balasa Trans Ltd | Transport & logistics | 2023 |
| Balbir Properties Limited | Real estate | 2022 |
| Baligod Law & Co Ltd | Professional & scientific | 2021 |
| Balkay Limited | Hospitality | 2018 |
| Ballantyne & Dino Caterers Limited | Hospitality | 2018 |
| Ballawnan Limited | Administrative & support | 2006 |
| Ballmaster Pro Shop Ltd | Wholesale & retail | 2026 |
| Ballyhay Properties Limited | Real estate | 2025 |
| Balson Property Ltd | Real estate | 2025 |
| BAM Films Ltd | Information & communication | 2025 |
| BAM Management Services Limited | Information & communication | 2018 |
| Banana Dolphin Ltd | Extraterritorial | 2014 |
| Bancroft Creative Services Limited | Professional & scientific | 2017 |
| Banh MI 108 Limited | Hospitality | 2026 |
| Baobab Social Care Ltd | Health & social care | 2014 |
| Barclay Gardens Management Limited | Households | 2019 |
| Barely BLU Ltd | Wholesale & retail | 2025 |
| Barhey Enterprise Limited | Professional & scientific | 2015 |
| Barker Wilkinson Limited | Professional & scientific | 2016 |
| Barley Court Residents Management Company Limited | Households | 2003 |
| Barnaby Holdings Ltd | Real estate | 2024 |
| Barnstaple Van and Car Hire Limited | Extraterritorial | 2015 |
| Barnstaple Van Hire Limited | Extraterritorial | 2015 |
| Baroni Healthcare Limited | Health & social care | 2015 |
| Barratts Theatre School Ltd | Education | 2014 |
| Barringer Mouldings Ltd | Manufacturing | 2019 |
| Barry Jones Autocentre Limited | Wholesale & retail | 2007 |
| Barry’S Fitness Guru Ltd | Arts & recreation | 2023 |
| Bartholomew Driving School Limited | Education | 2025 |
| Barton Domestic Skip and Grab Hire Limited | Other services | 2014 |
| Barton Halo Care Ltd | Health & social care | 2026 |
| Barton Hills Facial Aesthetics and Healthcare Limited | Health & social care | 2019 |
| Barton Skip and Grab Hire Limited | Water & waste | 2013 |
| Barton Waste Limited | Water & waste | 2017 |
| Basalt IT Consulting Limited | Information & communication | 2007 |
| Basedata Limited | Information & communication | 1994 |
| Basheera International Limited | Information & communication | 2024 |
| Basra Developments Limited | Real estate | 2023 |
| Basra Property Investments Ltd | Real estate | 2025 |
| Baumac Engineering Limited | Construction | 2013 |
| Bay Rock Leisure Limited | Hospitality | 2018 |
| BB2 Productions Ltd | Arts & recreation | 2016 |
| Bbbraidbar Ltd | Other services | 2025 |
| BBL Solutions Limited | Information & communication | 2000 |
| Bbma Holdings Limited | Financial services | 2020 |
| Bbronk Ltd | Health & social care | 2014 |
| BC Aesthetics Medispa Limited | Health & social care | 2024 |
| BC REG Consulting Limited | Professional & scientific | 2019 |
| BCC Associates Limited | Administrative & support | 2022 |
| BD Medical Limited | Health & social care | 2026 |
| BD Productions Limited | Information & communication | 2021 |
| BDC Capital Limited | Financial services | 2017 |
| Bdesai Ltd | Wholesale & retail | 2026 |
| BDH Builders Limited | Construction | 2019 |
| Bdjp Electrical Ltd | Construction | 2017 |
| BE Betty BOO Ltd | Information & communication | 2015 |
| BE Dating Beautiful Limited | Professional & scientific | 2023 |
| BE Humankind Care Ltd | Health & social care | 2023 |
| Beaf Limited | Professional & scientific | 2013 |
| Beamarc Enterprise Limited | Health & social care | 2023 |
| Beane Consultancy Limited | Professional & scientific | 2015 |
| Bear Project Management Ltd | Construction | 2024 |
| Bear With US Productions Ltd | Arts & recreation | 2018 |
| Bearton Villa Management Company Limited | Households | 2005 |
| Beat Street Events Ltd | Arts & recreation | 2024 |
| Beat the Heat AC Ltd | Energy | 2024 |
| Beatrice Pharmacy Limited | Wholesale & retail | 2022 |