| Birches Properties Limited | Real estate | 2023 |
| Birchwood Insolvency Ltd | Other services | 2021 |
| Birchwood One Management Limited | Households | 2007 |
| Birkby Medical Ltd | Health & social care | 2021 |
| Birramcuk Ltd | Wholesale & retail | 2026 |
| Birtish Beauty Ltd | Wholesale & retail | 2024 |
| Bishyika Limited | Wholesale & retail | 2018 |
| Bismillah Kitchen Ltd | Hospitality | 2022 |
| Bismillah Motors Ltd | Wholesale & retail | 2020 |
| Bisync Services Ltd | Other services | 2025 |
| Bites of East Limited | Hospitality | 2025 |
| Bito Ltd | Information & communication | 2015 |
| Bitwen Recovery Ltd | Manufacturing | 2022 |
| BIZ Traders Ltd | Wholesale & retail | 2021 |
| Bizacks Ltd | Administrative & support | 2023 |
| Bizbunny Ltd | Wholesale & retail | 2025 |
| Bizcol PVT Limited | Information & communication | 2021 |
| Bizra Ltd | Wholesale & retail | 2024 |
| Bizz BUZ Ltd | Wholesale & retail | 2024 |
| Bjbailey Property Ltd | Real estate | 2025 |
| BJL Tree Services Ltd | Administrative & support | 2025 |
| BJT Removals and Clearances Ltd | Transport & logistics | 2025 |
| BK Business Investments Ltd | Real estate | 2019 |
| BK Digitech Ltd | Information & communication | 2023 |
| BK Fashions Limited | Wholesale & retail | 2023 |
| BKA Global Ltd | Professional & scientific | 2020 |
| BKM Property Services Ltd | Households | 2024 |
| BKP Services Ltd | Administrative & support | 2020 |
| BKS Group Ltd | Arts & recreation | 2019 |
| BKS Restaurant Limited | Wholesale & retail | 2025 |
| BL Bathrooms Ltd | Construction | 2020 |
| Black Copper Ltd | Wholesale & retail | 2014 |
| Black Hill Holdings Limited | Financial services | 2006 |
| Black Ladd Shaw Ltd | Hospitality | 2024 |
| Black Oak Projects (NW) Limited | Construction | 2026 |
| Black Panther Logistic Limited | Transport & logistics | 2024 |
| Black Panther Signs Limited | Construction | 2015 |
| Blackbird & Wilde Ltd | Wholesale & retail | 2023 |
| Blackburn Circuit Design Holdings Limited | Manufacturing | 2011 |
| Blackburn Circuit Design Limited | Manufacturing | 1990 |
| Blackcurrant Global Limited | Manufacturing | 2014 |
| Blackeye Films & Media Limited | Information & communication | 2025 |
| Blackfinch Properties Limited | Real estate | 2018 |
| Blackline 6000 Ltd | Administrative & support | 2021 |
| Blackspot Media Productions Limited | Information & communication | 2023 |
| Blackstone Automotive Solutions Ltd | Wholesale & retail | 2026 |
| Blackstone Build Ltd | Construction | 2026 |
| Blackstone Cycle Works Ltd | Administrative & support | 2016 |
| Blackstone Digital Ltd | Professional & scientific | 2012 |
| Blackstone MCR Ltd | Real estate | 2026 |
| Blackstone MOT Ltd | Wholesale & retail | 2021 |
| Blackstone Properties NW Ltd | Households | 2018 |
| Blackstone Travels Ltd | Administrative & support | 2011 |
| Blackwell Strategy Ltd | Professional & scientific | 2025 |
| Blackwood Automotive Ltd | Wholesale & retail | 2025 |
| Blackwood Ovens Limited | Wholesale & retail | 2021 |
| Blackwood Utility Solutions Ltd | Wholesale & retail | 2026 |
| Bladen Electrical Limited | Construction | 2006 |
| Bladerunner Group Ltd. | Other services | 2016 |
| Blakes Wholesale Ltd | Wholesale & retail | 2019 |
| Blanshard 22 Ltd | Construction | 2020 |
| Blast Drinks Ltd | Manufacturing | 2023 |
| Blast Enterprises Ltd | Financial services | 2025 |
| Blaze Resourcing Limited | Administrative & support | 2002 |
| Blbas Charcoal Grill Ltd | Hospitality | 2025 |
| Blenfire Limited | Professional & scientific | 2012 |
| Blessed Beginning Childcare Ltd | Health & social care | 2024 |
| BLG Livio Ltd | Transport & logistics | 2019 |
| BLH Trading Ltd | Wholesale & retail | 2023 |
| BLI Tattooist Limited | Other services | 2003 |
| Blindsy Ltd | Other services | 2025 |
| Blink Logistics Ltd | Transport & logistics | 2021 |
| Bliss Crystal Ltd | Administrative & support | 2025 |
| Bliss Kitchen Ltd | Hospitality | 2025 |
| Blissful Beds Ltd | Wholesale & retail | 2024 |
| Blitish Properties Ltd | Real estate | 2024 |
| Bloa Maintenance Limited | Construction | 2025 |
| Bloom Hampers Ltd | Wholesale & retail | 2024 |
| Blooming Halo Studio Limited | Manufacturing | 2025 |
| Blooominary Limited | Education | 2025 |
| Bloss Management Ltd | Real estate | 2009 |
| Blossom Education and Training Services Limited | Education | 2019 |
| Blossoms and Balloons MCR Limited | Wholesale & retail | 2023 |
| Blue Bird Motorcare Ltd | Professional & scientific | 2023 |
| Blue Bricks Oldham Limited | Real estate | 2021 |
| Blue Elephant Solutions Limited | Administrative & support | 2013 |
| Blue Marble Environmental Group Limited | Financial services | 2025 |
| Blue Moon Online Limited | Wholesale & retail | 2022 |
| Blue Onion Cafe Ltd | Hospitality | 2020 |
| Blue Planet Real Estate Ltd | Real estate | 2025 |
| Blue Rhino Graphix Limited | Manufacturing | 2020 |
| Blue Sky FS Ltd | Financial services | 2025 |
| Blue Skye Estate Ltd | Real estate | 2024 |
| Blue Star Express 22 Limited | Wholesale & retail | 2026 |
| Blue Tick Marketing Limited | Professional & scientific | 2026 |
| Blue Tree Care Limited | Health & social care | 2016 |
| Blue Tree Children's Home Limited | Health & social care | 2018 |
| Bluebell Public House Shaw Limited | Hospitality | 2013 |
| Bluecake Creative Ltd | Professional & scientific | 2010 |
| Bluecore Systems Ltd Ltd | Other services | 2026 |