| Blackpool Damp Proofing (Lancs) Ltd | Extraterritorial | 2026 |
| Blackpool Damp Proofing Ltd | Construction | 2020 |
| Blackridge Construction Limited | Construction | 2018 |
| Blackridge Holdings Limited | Construction | 2018 |
| Blackrock Engineering Limited | Professional & scientific | 1993 |
| Blacks Chauffeurs Ltd | Transport & logistics | 2019 |
| Blacks Global Ltd | Transport & logistics | 2022 |
| Blacksheep Property Limited | Other services | 2011 |
| Blackstock Lease Ltd | Wholesale & retail | 2023 |
| Blackstock Marble and Granite Ltd | Manufacturing | 2026 |
| Blackstock Marble Ltd | Manufacturing | 2026 |
| Blackstocks Ltd | Real estate | 2005 |
| Blackstone Edge Holdings Ltd | Real estate | 2024 |
| Blackstone Market Ltd | Wholesale & retail | 2026 |
| Blackwater Land & Property Ltd | Real estate | 2024 |
| Blackwater Management Ltd | Arts & recreation | 2025 |
| Blade Repair Limited | Professional & scientific | 2022 |
| Blade Sinclair Services Ltd | Transport & logistics | 2024 |
| Blair Packaging Limited | Manufacturing | 1981 |
| Blair Sports Ltd | Administrative & support | 2025 |
| Blake's Cosy Wear Ltd | Wholesale & retail | 2020 |
| Blake's Emporiums Ltd | Wholesale & retail | 2025 |
| BLAKELAY28 Ltd | Professional & scientific | 2025 |
| Blakemore Solutions Limited | Construction | 2018 |
| Blakmint Ltd | Wholesale & retail | 2022 |
| Blanc Aesthetics Liverpool Ltd | Other services | 2025 |
| Blanca Sport Limited | Wholesale & retail | 2022 |
| Blanchfield Montaldo Solutions Ltd | Professional & scientific | 2023 |
| Blanchford & Co.Limited | Wholesale & retail | 1938 |
| Blanka’S Ltd | Manufacturing | 2024 |
| Blankstone Investments Limited | Real estate | 1959 |
| Blano CLO Ltd | Wholesale & retail | 2026 |
| Blantyre Trading Group Ltd | Wholesale & retail | 2023 |
| Blarney Stone Ltd | Hospitality | 2024 |
| Blastaway Pressure Washing Services Ltd | Administrative & support | 2024 |
| Blaul Bookkeeping Ltd | Professional & scientific | 2025 |
| Blaze Brands Ltd | Wholesale & retail | 2023 |
| Blaze Media Consultancy Ltd | Administrative & support | 2017 |
| Blck Ltd | Professional & scientific | 2021 |
| Blejhioo Ltd | Wholesale & retail | 2025 |
| Blend Barbershop Ltd | Manufacturing | 2023 |
| Blend Box Vending Ltd | Wholesale & retail | 2024 |
| Blended by Design Ltd | Extraterritorial | 2023 |
| Blended Lifestyle Limited | Other services | 2025 |
| Blends Cafe Ltd | Hospitality | 2024 |
| Blenesis Limited | Financial services | 2025 |
| Blessed Logistics Ltd | Transport & logistics | 2025 |
| Blessed Tochec Limited | Health & social care | 2023 |
| Blessing Sea Ltd | Information & communication | 2019 |
| Blessingblings Ltd | Wholesale & retail | 2025 |
| Blessington Holdings Ltd | Financial services | 2019 |
| BLF North West Limited | Professional & scientific | 2022 |
| Blfs Consulting Ltd | Administrative & support | 2014 |
| Blfs Properties Limited | Real estate | 2017 |
| Bligh Developments Ltd | Construction | 2016 |
| Blind Spot Liverpool Ltd | Other services | 2022 |
| Blind Tiger Bars Ltd | Hospitality | 2022 |
| Blinds and Shutters by Bespoke Ltd | Wholesale & retail | 2024 |
| Bling Your Rims (NW) Limited | Wholesale & retail | 2016 |
| Blingz Food Service Ltd | Wholesale & retail | 2024 |
| Blinklynk Limited | Wholesale & retail | 2022 |
| Blinkmartconvenience Limited | Wholesale & retail | 2025 |
| Blinova Ecom Ltd | Wholesale & retail | 2025 |
| Bliss Care and Support Services Ltd | Health & social care | 2022 |
| Bliss Recruitment Ltd | Administrative & support | 2019 |
| Blissafrican Group Services Limited | Wholesale & retail | 2023 |
| Blisscare & NA, UK Ltd | Professional & scientific | 2023 |
| Blissgsinging Ltd | Arts & recreation | 2025 |
| Blista Events Planner Ltd | Hospitality | 2025 |
| Blixster Properties Limited | Real estate | 2016 |
| BLK GAS Services Ltd | Construction | 2022 |
| BLM Plant Ltd | Administrative & support | 2025 |
| BLOC13 Management Ltd | Professional & scientific | 2024 |
| Block and Bone Limited | Other services | 2019 |
| Block by POD Properties Ltd | Real estate | 2025 |
| Block Compliance Ltd | Professional & scientific | 2021 |
| Block FM Ltd | Administrative & support | 2015 |
| Blockbusters Drainage Solutions Ltd | Administrative & support | 2025 |
| Blockera Ltd | Extraterritorial | 2023 |
| Blogmindsoul Ltd | Information & communication | 2023 |
| Blondao Transport Ltd | Transport & logistics | 2018 |
| Blondee Boujee Ltd | Other services | 2024 |
| Blondies NW Ltd | Hospitality | 2022 |
| Blood Orange Games Ltd | Manufacturing | 2025 |
| Blood Sense Limited | Administrative & support | 2017 |
| Blood Tests Liverpool Ltd | Health & social care | 2026 |
| Bloograna Ltd | Construction | 2025 |
| Bloom @ Aintree Ltd | Health & social care | 2024 |
| Bloom @ Kirkby Town Centre Ltd | Health & social care | 2026 |
| Bloom @ ST. Nics Ltd | Health & social care | 2024 |
| Bloom @ Stockbridge Village Ltd | Health & social care | 2025 |
| Bloom @ Tuebrook Ltd | Health & social care | 2024 |
| Bloom Aesthetics and Beauty Clinic Ltd | Education | 2021 |
| Bloom and Branch Social CIC | Health & social care | 2025 |
| Bloom Huyton Ltd | Health & social care | 2010 |
| Bloom Northwood Ltd | Health & social care | 2011 |
| Bloom Revalidation Limited | Professional & scientific | 2016 |
| Bloom Southdene Ltd | Health & social care | 2010 |
| Bloomberg Medical Ltd | Health & social care | 2024 |
| Bloomcycle Ltd | Manufacturing | 2026 |