| Blazefield Property Limited | Real estate | 2023 |
| Blazelive Media Ltd | Wholesale & retail | 2025 |
| Blazeways Ltd | Wholesale & retail | 2024 |
| Blazing Star Media Cultural Co., Ltd | Wholesale & retail | 2025 |
| BLC Corp-Serve Ltd | Professional & scientific | 2018 |
| Blendpixel Ltd | Wholesale & retail | 2023 |
| Blessed Angelus Limited | Construction | 2015 |
| Blessing Kuldevta Limited | Hospitality | 2024 |
| Blind OWL Coffee Co Ltd | Manufacturing | 2018 |
| Blingbo Ltd | Manufacturing | 2025 |
| Blinkflex Ltd | Education | 2023 |
| Blinkheart Ltd | Wholesale & retail | 2024 |
| Blinky Investments Ltd | Real estate | 2019 |
| Bliss Health Life Ltd | Wholesale & retail | 2025 |
| Blissbx Ltd | Wholesale & retail | 2025 |
| BLK Snowflake Limited | Education | 2025 |
| Block Special Maintenance Ltd | Administrative & support | 2018 |
| Blonde ROX Ltd | Wholesale & retail | 2015 |
| Bloom Notes Limited | Wholesale & retail | 2024 |
| Bloomchic UK Ltd | Wholesale & retail | 2024 |
| Blosso Ltd | Wholesale & retail | 2025 |
| Blox Trade Company Ltd | Information & communication | 2025 |
| Blue Apple Education Group Ltd | Financial services | 2026 |
| Blue Apple Education Limited | Education | 2000 |
| Blue Apple Properties Ltd | Real estate | 2022 |
| Blue Crow Ltd | Information & communication | 2025 |
| Blue Geneva Ltd | Information & communication | 2020 |
| Blue Guild Services Ltd | Construction | 2026 |
| Blue Horizon Marine 1 Ltd | Administrative & support | 2025 |
| Blue Interactive Trading Co., Ltd | Wholesale & retail | 2025 |
| Blue JIN Limited | Wholesale & retail | 2023 |
| Blue Koala Associates Ltd | Administrative & support | 2020 |
| Blue Line International Trading Limited | Wholesale & retail | 2024 |
| Blue Moon Sky Limited | Wholesale & retail | 2024 |
| Blue Ocean Biotechnology Ltd | Wholesale & retail | 2025 |
| Blue Ocean Fin-Tech Limited | Wholesale & retail | 2021 |
| Blue Rain Trading Ltd | Wholesale & retail | 2025 |
| Blue Reed Ltd | Wholesale & retail | 2026 |
| Blue Rich Ltd | Wholesale & retail | 2025 |
| Blue Side Property Sourcing Ltd | Real estate | 2026 |
| Blue Sky Connections CIC | Arts & recreation | 2024 |
| Blue Sky Creative Consulting (UK) Ltd | Information & communication | 2026 |
| Blue Thistle West Ltd | Administrative & support | 2018 |
| Bluebal Link Trading Ltd | Wholesale & retail | 2025 |
| Blueberry and Cereals Limited | Wholesale & retail | 2025 |
| Blueberry Supply Chain Co., Ltd | Wholesale & retail | 2025 |
| Bluebridge Ecom Limited | Wholesale & retail | 2025 |
| Bluecape Global Ltd | Manufacturing | 2026 |
| Bluecrest Consulting Services Ltd | Information & communication | 2026 |
| Bluecrest Market Ltd | Wholesale & retail | 2025 |
| Bluecroft Associates Limited | Financial services | 2010 |
| Blueforge Systems Ltd | Administrative & support | 2025 |
| Blueline Holdings Ltd | Real estate | 2025 |
| Bluenest Utilities Ltd | Professional & scientific | 2025 |
| Blueorbyt Ltd | Wholesale & retail | 2025 |
| Blueprint Commerce Ltd | Wholesale & retail | 2025 |
| Blueskies Software Ltd | Information & communication | 2026 |
| Bluestream Global Ltd | Wholesale & retail | 2025 |
| Bluetickblank Ltd | Wholesale & retail | 2019 |
| Bluewater Meditation Ltd | Administrative & support | 2024 |
| Blushbox Ltd | Wholesale & retail | 2025 |
| Blustarx Ltd | Wholesale & retail | 2025 |
| Blut Ltd | Wholesale & retail | 2023 |
| Bluverse Digital Hub Ltd | Wholesale & retail | 2026 |
| BLY Entertainment Limited | Wholesale & retail | 2025 |
| BLY Investments UK Ltd | Financial services | 2026 |
| Blyss Global Ltd | Manufacturing | 2026 |
| BM UK Consultancy Ltd | Professional & scientific | 2022 |
| BMA Electrical Contractors Ltd | Manufacturing | 2020 |
| Boahene Strategic Consulting Ltd | Professional & scientific | 2025 |
| Boardify Ltd | Information & communication | 2025 |
| BOB Creation Ltd | Wholesale & retail | 2022 |
| BOB Moran Limited | Arts & recreation | 2021 |
| BOB Trading Ltd | Wholesale & retail | 2025 |
| Bochu Shop Ltd | Wholesale & retail | 2025 |
| Bodhi Creations Ltd | Manufacturing | 2024 |
| Bodies in Action Engendering Contemporary Dance C.I.C. | Arts & recreation | 2021 |
| Bodoceanhca Ltd | Health & social care | 2025 |
| Body Rocker Music Ltd | Extraterritorial | 2021 |
| Body Rocker Records Ltd | Extraterritorial | 2019 |
| Bokkt Ltd | Transport & logistics | 2025 |
| Boldrise Properties Limited | Real estate | 2024 |
| Bole Cultural Media Limited | Extraterritorial | 2025 |
| Bollens Capital Ltd | Financial services | 2025 |
| Bolt Hooks Limited | Other services | 2026 |
| Bolton Orlando Ltd. | Financial services | 2025 |
| Bomonde Ltd | Wholesale & retail | 2021 |
| Bonastar Trading Ltd | Wholesale & retail | 2024 |
| Bondmaster UK Ltd | Manufacturing | 2025 |
| Bone Plus Co., Ltd. | Extraterritorial | 2012 |
| Bongwill Designs Ltd | Wholesale & retail | 2025 |
| Boniface Steele Ltd | Wholesale & retail | 2025 |
| Bonitadot Ltd | Wholesale & retail | 2023 |
| Bonjour Travel Ltd | Administrative & support | 2025 |
| Bonroy Trading Co., Ltd | Wholesale & retail | 2020 |
| Bonstmor Persbury Ltd | Wholesale & retail | 2026 |
| BOOKKEEPING4YOU UK Ltd | Professional & scientific | 2020 |
| Boost Adsales Ltd | Information & communication | 2025 |
| Boost Trading Ltd | Wholesale & retail | 2026 |
| Boostas Group Ltd | Education | 2024 |