| Blackley Developments Limited | Real estate | 2015 |
| Blackley Golf Club Trading Limited | Hospitality | 2019 |
| Blackley Holdings Limited | Professional & scientific | 2010 |
| Blackley New Road Management Company One Limited | Households | 1998 |
| Blackley Service Station Ltd. | Wholesale & retail | 2016 |
| Blackley Spicy Chef Limited | Hospitality | 2025 |
| Blackley Superstore Limited | Wholesale & retail | 2022 |
| Blackline Protection Ltd. | Administrative & support | 2026 |
| Blackly Streets Cars Ltd | Wholesale & retail | 2025 |
| Blackmont Legal Ltd | Professional & scientific | 2024 |
| Blackmont Strategic Advisory Ltd | Financial services | 2021 |
| Blackmore SPV 13 Ltd | Real estate | 2017 |
| Blackmore SPV 2 Ltd | Real estate | 2016 |
| Blackmore SPV 3 Ltd | Real estate | 2017 |
| Blackmore SPV 5 Ltd | Real estate | 2017 |
| Blackmore SPV 6 Ltd | Real estate | 2017 |
| Blackmour Trading Ltd | Wholesale & retail | 2021 |
| Blackout Studio Ltd | Information & communication | 2021 |
| Blackowned Enterprises Ltd | Wholesale & retail | 2022 |
| Blackpole Recycling Limited | Water & waste | 2006 |
| Blackpool Automotive Limited | | 1962 |
| Blackpool Community Theatre CIC | Arts & recreation | 2024 |
| Blackpool Holidays Limited | Arts & recreation | 1997 |
| Blackpool Rock & Toys Company Limited | Wholesale & retail | 2017 |
| Blackrock Civil Engineers Ltd | Construction | 2025 |
| Blackrock Corp Ltd | Professional & scientific | 2024 |
| Blackrock Holding Group Ltd | Real estate | 2022 |
| Blackrock Minibuses Limited | Transport & logistics | 2025 |
| Blackrock Motor Group Ltd | Wholesale & retail | 2026 |
| Blackrock Property Investments Ltd | Real estate | 2024 |
| Blackrod Spice House Ltd | Hospitality | 2025 |
| Blackseed Properties Ltd | Real estate | 2021 |
| Blackshaw Construction Limited | Construction | 2019 |
| Blackshaw Elite Shepherds Ltd | Real estate | 2026 |
| Blacksheep Acquisitions Limited | Real estate | 2020 |
| Blackspire Business Ltd | Wholesale & retail | 2025 |
| Blacksquare Advisory Limited | Financial services | 2018 |
| Blacksquare Advisory Topco Limited | Financial services | 2022 |
| Blackstar GM Ltd | Real estate | 1994 |
| Blackstar Group Solutions Ltd | Administrative & support | 2013 |
| Blacksticks Restaurant Limited | Hospitality | 2008 |
| Blackstone (NW) Ltd | Wholesale & retail | 2016 |
| Blackstone Estate Agency Ltd | Real estate | 2015 |
| Blackstone Holdings MCR Ltd | Construction | 2025 |
| Blackstone Ledger Ltd | Professional & scientific | 2025 |
| Blackstone Security Services Ltd | Administrative & support | 2025 |
| Blackstones Manchester Ltd | Real estate | 2026 |
| Blacktail Limited | Financial services | 2024 |
| Blackthorn and Beech Ltd | Manufacturing | 2026 |
| Blackthorn Investment Group Limited | Financial services | 2019 |
| Blackwin Local Store Ltd | Wholesale & retail | 2024 |
| Blackwin Superstore Ltd | Wholesale & retail | 2021 |
| Blackwood Barber Co. Ltd | Other services | 2020 |
| Blackwood Exotics Ltd | Wholesale & retail | 2025 |
| Blade & Fade Barbers MCR Ltd | Other services | 2024 |
| Blade GJS Management Company Ltd | Households | 2023 |
| Blades Building Limited | Construction | 2023 |
| Blades Urmston Limited | Other services | 2019 |
| Bladon Jets (UK) Limited | Manufacturing | 2002 |
| Blair Athol Limited | Extraterritorial | 2009 |
| Blair Project Ltd | Information & communication | 2014 |
| Blairsden Mohaw Ltd | Wholesale & retail | 2025 |
| Blake Electrical Services (NW) Limited | Construction | 2019 |
| Blake Grounds Services Limited | Administrative & support | 2018 |
| Blake House Management Company Limited | Administrative & support | 2001 |
| Blake Mill Limited | Wholesale & retail | 2008 |
| Blake Sales Limited | Professional & scientific | 2025 |
| Blakeco Ltd | Information & communication | 2020 |
| Blakehope Limited | Transport & logistics | 1986 |
| Blakes Cleaning Services Limited | Administrative & support | 2025 |
| Blakesley Consulting Limited | Professional & scientific | 2021 |
| Blakesure Property Ltd | Real estate | 2025 |
| Blakethorne Estates Limited | Real estate | 2013 |
| Blakewood Properties (NO.2) Ltd | Professional & scientific | 2013 |
| Blakewood Properties Ltd | Professional & scientific | 2013 |
| Blakey Camlibel Ltd | Hospitality | 2026 |
| Blaminory Ltd | Wholesale & retail | 2026 |
| Blamire Properties Ltd | Real estate | 2025 |
| Blamonge Ltd | Real estate | 2026 |
| Blanc Audio Limited | Information & communication | 2019 |
| Blanc Collective Ltd | Administrative & support | 2026 |
| Blanc Events Worldwide Ltd | Arts & recreation | 2021 |
| Blanc Fashion Ltd | Wholesale & retail | 2021 |
| Blanc Festivals Ltd | Arts & recreation | 2021 |
| Blanc Label Ltd | Wholesale & retail | 2025 |
| Blanc Marketing Ltd | Professional & scientific | 2021 |
| Blanc Space Ltd | Administrative & support | 2025 |
| Blanc Story Studio Ltd | Professional & scientific | 2025 |
| Blanc Studio Packaging Ltd | Manufacturing | 2025 |
| Blanc the Agency Limited | Professional & scientific | 2025 |
| Blancc Ltd | Professional & scientific | 2025 |
| Blanchard Floorworks Ltd | Construction | 2025 |
| Blanchard Roofworks Ltd | Construction | 2025 |
| Blanconero Ltd | Hospitality | 2023 |
| Bland Properties Ltd | Real estate | 2019 |
| Blandford Limited | Real estate | 1987 |
| Blank Art LDN Limited | Arts & recreation | 2024 |
| Blank Art Limited | Manufacturing | 2023 |
| Blank Karma Ltd | Information & communication | 2023 |
| Blank Space Content Ltd | Arts & recreation | 2025 |