| Bloomerchant Ltd | Wholesale & retail | 2026 |
| Bloomin Creative Ltd | Professional & scientific | 2014 |
| Bloomin Forests Ltd | Extraterritorial | 2025 |
| Blooming Flower Shop Designer Florist Ltd | Wholesale & retail | 2020 |
| Blooming Nice Publishing Limited | Information & communication | 2012 |
| Bloomingyear Limited | Real estate | 2016 |
| Bloriginals Clothing Brand Ltd | Wholesale & retail | 2026 |
| Blossom & Resources Ltd | Hospitality | 2025 |
| Blossom Beauty and Fashion Ltd | Other services | 2025 |
| Blossom Hill Developments Ltd | Construction | 2004 |
| Blossom Kitchens & Interiors Ltd | Other services | 2023 |
| Blossom Payments Ltd | Administrative & support | 2023 |
| Blossom Staffing Ltd | Administrative & support | 2020 |
| Blossom Training NW Ltd | Other services | 2020 |
| Blossoming Butterflies C.I.C. | Other services | 2024 |
| Blow E-Lixir Ltd | Manufacturing | 2017 |
| Blowers Hair Salon Ltd | Other services | 2016 |
| Blowfish Technology Ltd | Information & communication | 2012 |
| Blowspa Ltd | Professional & scientific | 2023 |
| Bloxt Eco Solutions Ltd | Construction | 2024 |
| Bloxt Energy Ltd | Manufacturing | 2023 |
| Bloxt Limited | Construction | 2023 |
| Bloxt Technologies Ltd | Construction | 2023 |
| BLR Developments Ltd | Real estate | 2021 |
| BLS Site Services Ltd | Administrative & support | 2021 |
| Blsn Limited | Wholesale & retail | 2018 |
| Blss Property Management Limited | Construction | 2025 |
| BLU (Liverpool) Ltd | Hospitality | 2017 |
| BLU Fire Ltd | Administrative & support | 2022 |
| BLU Invest Ltd | Administrative & support | 2015 |
| Blu-Sky (UK) Ltd | Wholesale & retail | 2009 |
| Blue Angel Trading Limited | Professional & scientific | 2017 |
| Blue Automotive Ltd | Administrative & support | 2018 |
| Blue Barber Shop Limited | Other services | 2004 |
| Blue Beacon Ltd | Hospitality | 2015 |
| Blue Bell Gastro Smallwood Ltd | Hospitality | 2018 |
| Blue Bird Bistros Ltd | Hospitality | 2024 |
| Blue Cat Productions Ltd | Information & communication | 2020 |
| Blue Cedar Management Ltd | Real estate | 2019 |
| Blue Cloud Thinking Limited | Professional & scientific | 2013 |
| Blue DOK Ltd | Hospitality | 2022 |
| Blue Electrical (NW) Ltd | Construction | 2024 |
| Blue Family Support Service Ltd | Education | 2026 |
| Blue FIN Seafood Ltd | Manufacturing | 2025 |
| Blue Fish 28 Limited | Hospitality | 2025 |
| Blue Frog Education Solutions Limited | Education | 2017 |
| Blue Goose U.K Ltd | Administrative & support | 2020 |
| Blue Haven Recruitment Limited | Administrative & support | 2012 |
| Blue INK Group Limited | Real estate | 2020 |
| Blue IVY Studio Limited | Other services | 2019 |
| Blue JAY Property Investments Limited | Real estate | 2017 |
| Blue Leisure Limited | Administrative & support | 2016 |
| Blue Leopard Coaching Ltd | Professional & scientific | 2025 |
| Blue Lily Fashion Ltd | Administrative & support | 2016 |
| Blue Lion Medical Limited | Professional & scientific | 2012 |
| Blue Locust Network Ltd | Professional & scientific | 2011 |
| Blue Management Limited | Real estate | 2002 |
| Blue Melody Recruitment Ltd | Administrative & support | 2021 |
| Blue Mersey Limited | Professional & scientific | 2022 |
| Blue Moon Logistics Ltd | Transport & logistics | 2024 |
| Blue Mountain Management Limited | Information & communication | 2000 |
| Blue Nile (Liverpool) Ltd | Wholesale & retail | 2019 |
| Blue Nile Number 1 Ltd | Wholesale & retail | 2026 |
| Blue Node Technologies Ltd | Information & communication | 2025 |
| Blue Obsidian Properties Ltd | Real estate | 2023 |
| Blue Ocean Nursery Ltd | Education | 2026 |
| Blue Orchid Enterprise Solutions Limited | Professional & scientific | 2014 |
| Blue Point Valeting Limited | Administrative & support | 2017 |
| Blue Raptor Property Group Ltd | Construction | 2019 |
| Blue Ribbon Fibre Limited | Information & communication | 2023 |
| Blue Ribbon Housing Development Limited | Construction | 2026 |
| Blue Ribbon Property Development Limited | Construction | 2026 |
| Blue Ridge Property Cleaning Management Ltd | Administrative & support | 2025 |
| Blue River Commercial Ltd | Real estate | 2024 |
| Blue River Store Ltd | Wholesale & retail | 2024 |
| Blue Sky (NW) Ltd | Hospitality | 2019 |
| Blue Sky (Widnes) Ltd | Hospitality | 2022 |
| Blue Sky Chauffeur Services Limited | Transport & logistics | 2018 |
| Blue Sky Consultancy Ltd | Professional & scientific | 2020 |
| Blue Sky Golf Tours Ltd | Administrative & support | 2023 |
| Blue Sky Healthcare Limited | Health & social care | 2022 |
| Blue Square Energy Ltd | Professional & scientific | 2024 |
| Blue Square Services Limited | Professional & scientific | 2024 |
| Blue Star 2026 Ltd | Hospitality | 2026 |
| Blue Star Nice Pizza Ltd | Hospitality | 2022 |
| Blue Star Tasty Food Ltd | Hospitality | 2026 |
| Blue Stefan Ltd | Other services | 2019 |
| Blue Suburban Skies Limited | Professional & scientific | 2021 |
| Blue Support Limited | Health & social care | 2025 |
| Blue Tang Holdings Ltd | Administrative & support | 2026 |
| Blue Tides Food Limited | Hospitality | 2026 |
| Blue Tower Leisure Ltd | Hospitality | 2013 |
| Blue Trails Group Ltd | Wholesale & retail | 2026 |
| Blue Whale Media Limited | Professional & scientific | 2012 |
| Blue Wholesale Limited | Wholesale & retail | 2022 |
| Blue Willow Property Services Ltd | Construction | 2022 |
| Blue Zeta Ltd | Professional & scientific | 2019 |
| Blue-Collar Compliance, Training and Support Services Ltd | Administrative & support | 2019 |
| Blueark Properties Ltd | Real estate | 2025 |
| Bluebay Technical Limited | Manufacturing | 2014 |