| B2B Embroidery & Print Limited | Manufacturing | 2022 |
| B2B Mart Limited | Wholesale & retail | 2024 |
| B2B Workwear & Janitorial Limited | Manufacturing | 2020 |
| B2H Ltd | Wholesale & retail | 2025 |
| B4BUSINESS Ltd | Wholesale & retail | 2025 |
| B4H Limited | Other services | 2025 |
| BA and Sons Limited | Construction | 2017 |
| BA Consulting Services Limited | Professional & scientific | 2024 |
| BA Environmental Solutions Ltd | Other services | 2023 |
| BA Property Development NW Limited | Real estate | 2026 |
| BA Technology Solutions Ltd | Information & communication | 2026 |
| Baa-Baa Media Ltd | Professional & scientific | 2023 |
| Baba Darbar Ltd | Hospitality | 2024 |
| Babalou Ltd | Hospitality | 2018 |
| Babington Consultancy Ltd | Professional & scientific | 2008 |
| Babington Projects Ltd | Professional & scientific | 2024 |
| Babji Solutions Limited | Information & communication | 2024 |
| Babscola Ltd | Health & social care | 2024 |
| Babu Multitraders Ltd | Wholesale & retail | 2014 |
| Babus Travel & Tours Ltd | Administrative & support | 2018 |
| Baby Bambino’S Ltd | Wholesale & retail | 2021 |
| Baby Blossoms C.I.C. | Education | 2025 |
| Baby Boom Class Ltd | Education | 2021 |
| Baby Dreams Limited | Wholesale & retail | 2019 |
| Baby Gaga Ltd | Education | 2020 |
| Baby Sound Asleep Limited | Health & social care | 2014 |
| Baby Ultrasound Clinic Blackburn Limited | Health & social care | 2020 |
| Baby Ultrasound Clinic Franchise Limited | Health & social care | 2020 |
| Baby Ultrasound Clinic Limited | Health & social care | 2015 |
| Babylon Kebab Ltd | Hospitality | 2022 |
| Babylon Services Group Limited | Information & communication | 2019 |
| Baccommodate Ltd | Construction | 2020 |
| Bacem Derouiche Ltd | Transport & logistics | 2026 |
| Back 2 Mine Ltd | Hospitality | 2020 |
| Backer Distribution Limited | Manufacturing | 2023 |
| Backer Electric Company Limited | Manufacturing | 2023 |
| Backer Electric Industrial Limited | Manufacturing | 2023 |
| Backer Heatrod Limited | Manufacturing | 1963 |
| Background Verification Services Ltd | Administrative & support | 2025 |
| Backup Northwest | Hospitality | 1997 |
| BAD Dog Security Ltd | Administrative & support | 2010 |
| BAD PAD Sports Ltd | Arts & recreation | 2024 |
| Baddy's Parlour Ltd | Other services | 2023 |
| Badri 313 Consultancy Ltd | Information & communication | 2025 |
| Badshah Lettings Agents Ltd | Construction | 2024 |
| Badshah Properties Limited | Real estate | 2019 |
| BAG Pipe Collection Ltd | Wholesale & retail | 2023 |
| Bagas Properties Ltd | Real estate | 2020 |
| Bagasi Investments Ltd | Financial services | 2019 |
| BAH Employment Limited | Other services | 2019 |
| Bahadvr Developments Ltd | Construction | 2018 |
| Bahrami Express Ltd | Administrative & support | 2022 |
| Bailey Advisory Ltd | Professional & scientific | 2024 |
| Bailey Tutoring Ltd | Extraterritorial | 2021 |
| Baileys Maintenance Ltd | Construction | 2009 |
| Bain Plumbing Services Ltd | Construction | 2006 |
| Baines and Banbury Limited | Construction | 2015 |
| Baituon Estate Agent Ltd | Real estate | 2018 |
| Baituon Ltd | Real estate | 2018 |
| BAK Sons Ltd | Construction | 2024 |
| Bake & Roast Ltd | Manufacturing | 2019 |
| Bake IT Like Bentham Ltd | Hospitality | 2020 |
| Baked by Marie Limited | Manufacturing | 2025 |
| Bakery British Patagonia Limited | Manufacturing | 2020 |
| Bakery NW Ltd | Hospitality | 2025 |
| Bakhtar Market Ltd | Wholesale & retail | 2024 |
| Bako Barber World Ltd | Other services | 2025 |
| Bako Property Ltd | Real estate | 2025 |
| Bakri Building Ltd | Construction | 2025 |
| BAL Aircraft Engineering Limited | Administrative & support | 2003 |
| Balaji Asset Limited | Real estate | 2019 |
| Balaji Medics Limited | Health & social care | 2018 |
| Balance & Symmetry Limited | Administrative & support | 2015 |
| Balance Counselling and Coaching Ltd | Other services | 2014 |
| Balee London Limited | Wholesale & retail | 2025 |
| Balkan 24 Ltd | Wholesale & retail | 2020 |
| Balkonas Ltd | Real estate | 2022 |
| Balmain Property Limited | Real estate | 2026 |
| Balmoral Court Management (Chorley) Limited | Households | 1994 |
| Balmoral Excavations Ltd | Other services | 2019 |
| Balshaw Consultancy Ltd | Information & communication | 2018 |
| Balshaw Investments Ltd | Financial services | 2025 |
| Balvee Limited | Wholesale & retail | 2015 |
| Bamboo Buds Ltd. | Wholesale & retail | 2019 |
| Bamboo Massage Centre Ltd | Other services | 2026 |
| Bamboo Republic Ltd | Wholesale & retail | 2023 |
| Bambridge Homes Limited | Construction | 2023 |
| Bamdad Consulting Limited | Information & communication | 2023 |
| Bamed Ltd | Wholesale & retail | 2022 |
| Bamford Edge Ltd | Professional & scientific | 2023 |
| Bamis Tech Solutions Ltd | Information & communication | 2014 |
| Bamz Solutions Ltd | Information & communication | 2025 |
| Bana Investments Limited | Real estate | 2022 |
| Banana BOY Ltd | Wholesale & retail | 2019 |
| Banapharm Ltd | Health & social care | 2019 |
| Bandit BEE Ltd | Wholesale & retail | 2022 |
| Bandobaby World Ltd | Wholesale & retail | 2020 |
| Bang Tidy Cleaning Limited | Other services | 2018 |
| Bangor Hand Car Wash Ltd | Wholesale & retail | 2023 |
| Bangor Spice Group Ltd | Hospitality | 2017 |