| Basketly Ltd | Wholesale & retail | 2026 |
| Basm (Netherlands) Chemical Group Co., Ltd | Manufacturing | 2024 |
| Basmah Media Ltd | Professional & scientific | 2024 |
| Bass Accountants International Limited | Administrative & support | 2026 |
| Bass Accountants Limited | Professional & scientific | 2021 |
| Bass Accountants MCR Limited | Professional & scientific | 2026 |
| Bass Real Estate NO. 2 Limited | Real estate | 2015 |
| Bass Real Estate NO. 4 Limited | Real estate | 2015 |
| Bass Real Estate NO. 5 Limited | Real estate | 2015 |
| Bass Services Limited | Other services | 2023 |
| Bassajamba CIC | Professional & scientific | 2013 |
| Bassam Abdurabu Mohammed for Trading Ltd | Wholesale & retail | 2021 |
| Bassdave Homes Limited | Health & social care | 2024 |
| Bassdent Ltd | Health & social care | 2024 |
| Bassey Homes Limited | Households | 2024 |
| Bassfield Limited | Professional & scientific | 2022 |
| Bastet Aparthotels Limited | Hospitality | 2025 |
| Bastionland Press Limited | Information & communication | 2019 |
| Baszak Engineering Limited | Professional & scientific | 2014 |
| Bata Properties Ltd | Wholesale & retail | 2024 |
| Bataka Homes Ltd | Real estate | 2025 |
| Batbut Ltd | Wholesale & retail | 2023 |
| Batch Global Ventures Ltd | Wholesale & retail | 2026 |
| Batch Video Ltd | Information & communication | 2021 |
| Batchable Enterprises Limited | Manufacturing | 1993 |
| Batchofbang Limited | Information & communication | 2025 |
| Batchrich Limited | | 1992 |
| Bate Solutions Ltd | Health & social care | 2023 |
| Batees Limited | Administrative & support | 2013 |
| Bateeze Consultancy Limited | Professional & scientific | 2011 |
| Bates House Garage Limited | Wholesale & retail | 2019 |
| Bates Legacy Group Ltd | Professional & scientific | 2025 |
| Bates Property Solutions Ltd | Real estate | 2024 |
| Bath Safe Ltd | Construction | 2011 |
| Bath Street Development Limited | Real estate | 2021 |
| Bath TAP Buddy Ltd | Manufacturing | 2023 |
| Bathroom Installation Services Limited | Construction | 2022 |
| Bati Tradi SUD Limited | Construction | 2019 |
| Batoca Ltd | Wholesale & retail | 2021 |
| Batolad Ltd | Professional & scientific | 2021 |
| Baton Lock Limited | Administrative & support | 1994 |
| Batool Healthcare Limited | Wholesale & retail | 2022 |
| Batool Medics Limited | Health & social care | 2025 |
| Battery Components Limited | Wholesale & retail | 2013 |
| Battery Force Ltd. | Extraterritorial | 2003 |
| Battlegrounds Analytics Ltd | Information & communication | 2021 |
| Battlekart Manchester Ltd | Arts & recreation | 2025 |
| BAU Dienstleistung Ltd | Administrative & support | 2024 |
| BAU UND Reinigungs Service Ltd | Administrative & support | 2025 |
| Bau&Mehr Ltd | Administrative & support | 2024 |
| Bauer Media Audio LP | | 2019 |
| Bauer Motor Company Limited | Wholesale & retail | 2026 |
| Bauhinia Investments Limited | Real estate | 2023 |
| Bauservice-Big Ltd | Administrative & support | 2025 |
| Bavaria Limited | Extraterritorial | 2017 |
| Bavarian - Food Limited | Hospitality | 2022 |
| Baville Styles Limited | Manufacturing | 1967 |
| Bavli Ltd | Real estate | 2026 |
| Bavylon Ltd | Construction | 2024 |
| Bawa News Ltd | Wholesale & retail | 2016 |
| Bawa Software Limited | Information & communication | 2019 |
| Bawabat AL Hulool Ltd | Other services | 2021 |
| Bawabat Al-Madina Investment Ltd | Wholesale & retail | 2025 |
| Bawar Ltd | Wholesale & retail | 2025 |
| Bawest Ltd | Health & social care | 2025 |
| Bawr Ltd | Hospitality | 2019 |
| Bawr Trading Ltd | Hospitality | 2019 |
| Bawrm Ltd | Hospitality | 2021 |
| Bawrm Trading Ltd | Hospitality | 2021 |
| Bawtry Carbon Limited | Manufacturing | 2018 |
| Baww Ltd | Construction | 2025 |
| BAX Analytics Limited | Information & communication | 2024 |
| Baxendale-Yates Woodwork Limited | | 1953 |
| Baxter Brothers Confectioners Ltd | Manufacturing | 2012 |
| Baxter Construction Services Ltd | Construction | 2025 |
| Baxter Harries Limited | Professional & scientific | 2014 |
| Baxter Personnel Limited | Administrative & support | 1991 |
| Baxter's Inspection Services Ltd | Professional & scientific | 2019 |
| Bay & Box Limited | Wholesale & retail | 2017 |
| Bay 7 Engineering Limited | Construction | 2022 |
| Bay Flat Rhyl Ltd | Real estate | 2024 |
| Bay Haughton Ltd | Hospitality | 2019 |
| Bay Horse Management Limited | Real estate | 2025 |
| Bay Horse Tavern Ltd | Hospitality | 2016 |
| Bay House of Art Limited | Arts & recreation | 2025 |
| Bay Medical Limited | Health & social care | 2012 |
| Bay Ventures Ltd | Wholesale & retail | 2026 |
| Bayam Medical Ltd | Health & social care | 2015 |
| Bayan CIC | Public administration | 2024 |
| Bayarcal Holding Limited | Financial services | 2022 |
| Baycity Solutions Limited | Wholesale & retail | 2024 |
| Baycrisp Limited | | 1989 |
| Bayes Electronics Ltd | Wholesale & retail | 2023 |
| Bayfirmfuture Ltd | Transport & logistics | 2019 |
| Baylasan Limited | Wholesale & retail | 2018 |
| Baynes Air Conditioning Ltd | Energy | 2020 |
| Bayonic Motors Ltd | Wholesale & retail | 2023 |
| Bayoudh Consulting Ltd | Information & communication | 2025 |
| Bays Edge Retreat Limited | Real estate | 2020 |
| Bayseven UK Ltd | Administrative & support | 2013 |