| Blockcontrol Partnership Ltd | Households | 2022 |
| Blocked Drains North West Ltd | Administrative & support | 2010 |
| Blockfoil Group Ltd | Extraterritorial | 1980 |
| Blockfoil Limited | Manufacturing | 1989 |
| Blockgain Ltd | Extraterritorial | 2024 |
| Blockmason Technologies Ltd | Information & communication | 2025 |
| Blockriver Holdings Ltd | Professional & scientific | 2025 |
| Blockriver UK Ltd | Financial services | 2025 |
| Blockwise Developments Limited | Construction | 2017 |
| Blockwise Estates and Planning Ltd | Construction | 2024 |
| Blockwise Network Limited | Construction | 2017 |
| Blockwise Trading Limited | Construction | 2024 |
| Blofeld Group Ltd | Financial services | 2025 |
| Blog on Conference Ltd | Information & communication | 2014 |
| Blogs for Days Ltd | Professional & scientific | 2021 |
| Bloidonia Ltd | Information & communication | 2017 |
| Blok Projects Limited | Manufacturing | 2021 |
| Blomfield Partners LLP | | 2022 |
| Blonda Group LP | | 2018 |
| Blonde the Label Ltd | Professional & scientific | 2020 |
| Blondine Ltd | Wholesale & retail | 2026 |
| Bloobox Direct Limited | Wholesale & retail | 2014 |
| BLOODSAMPLE360 Ltd | Health & social care | 2024 |
| Bloody Lovely Branding Co Ltd | Professional & scientific | 2020 |
| Bloom Aesthetics and Health Care Limited | Extraterritorial | 2025 |
| Bloom Al-Alamiyya Ltd | Wholesale & retail | 2026 |
| Bloom Bakery Ltd | Manufacturing | 2021 |
| Bloom Beyond CIC | Health & social care | 2025 |
| Bloom Carers Ltd | Health & social care | 2023 |
| Bloom Clinical Consulting Ltd | Health & social care | 2025 |
| Bloom Estates Limited | Real estate | 2016 |
| Bloom in Design Limited | Wholesale & retail | 2015 |
| Bloom Manchester Ltd | Administrative & support | 2019 |
| Bloom Medical Intermediary Limited | Financial services | 2021 |
| Bloom Property Group Limited | Real estate | 2022 |
| Bloom Publishing Ltd | Information & communication | 2024 |
| Bloom ST Convenience Store Ltd | Wholesale & retail | 2012 |
| Bloom ST Ltd. | Construction | 2014 |
| Bloom Street Boutique MCR Ltd | Wholesale & retail | 2026 |
| Bloomberry Ventures Limited | Real estate | 2025 |
| Bloomers Healthcare Services Ltd | Health & social care | 2015 |
| Bloomfield Real Estate Ltd | Real estate | 2020 |
| Bloomfield Restoration Limited | Wholesale & retail | 2026 |
| Bloomfield's Accountant's Ltd | Professional & scientific | 2017 |
| Bloomfield's Developments Ltd | Real estate | 2022 |
| Bloomhouse Limited | Health & social care | 2023 |
| Bloomify Home Basics Ltd | Wholesale & retail | 2026 |
| Bloomin' LLP | | 2019 |
| Blooming Adornments Ltd | Hospitality | 2025 |
| Blooming BUD Innovations Limited | Manufacturing | 2025 |
| Bloomlight Creative Ltd | Information & communication | 2022 |
| Bloomr Health & Wellness Ltd | Other services | 2025 |
| Blooms Drive Ltd | Other services | 2024 |
| Blooms Forever Good Limited | Wholesale & retail | 2025 |
| Blooms Healthcare Ltd | Administrative & support | 2020 |
| Bloomsbury Investments ( MCR) Limited | Real estate | 2024 |
| Bloomsbury Music Ltd | Arts & recreation | 2013 |
| Bloomstone Tutors Ltd | Education | 2026 |
| Bloomsway (Manchester) Limited | Wholesale & retail | 2004 |
| Bloor Street Ltd | Real estate | 2024 |
| Bloovi Ltd | Other services | 2021 |
| Blossom and Bliss Ltd | Wholesale & retail | 2025 |
| Blossom Bargain Shop Ltd | Wholesale & retail | 2011 |
| Blossom by Laturka INT Ltd | Hospitality | 2025 |
| Blossom by Laturka Ltd | Hospitality | 2024 |
| Blossom Cafe Point Ltd | Hospitality | 2023 |
| Blossom Care and Support Ltd | Health & social care | 2023 |
| Blossom Coffee Roasters Ltd | Wholesale & retail | 2020 |
| Blossom Flowers Chorlton Limited | Wholesale & retail | 2013 |
| Blossom Home Care Franchising Ltd | Professional & scientific | 2020 |
| Blossom Homecare Solutions Limited | Health & social care | 2024 |
| Blossom Linens Ltd | Wholesale & retail | 2018 |
| Blossom Manchester Limited | Manufacturing | 2017 |
| Blossom Medical Consultancy Ltd | Real estate | 2014 |
| Blossom Nest Care Ltd | Health & social care | 2025 |
| Blossom Properties NW Ltd | Real estate | 2024 |
| Blossom Skye Limited | Transport & logistics | 2016 |
| Blossom Stars Daycare Limited | Health & social care | 2025 |
| Blossom Support Ltd | Health & social care | 2026 |
| Blossom Tree Edventures Ltd | Health & social care | 2025 |
| Blossom UP Ltd | Wholesale & retail | 2025 |
| BLOSSOM4LIFE Properties Ltd | Real estate | 2022 |
| Blossoming Futures Limited | Health & social care | 2025 |
| Blossoming Prosperity Ltd | Real estate | 2015 |
| Blossoms Music Limited | Arts & recreation | 2016 |
| Blossomville Limited | Professional & scientific | 2012 |
| Blotaste Food for Packaging & Processing Ltd | Wholesale & retail | 2026 |
| Blow 51 Ltd | Other services | 2025 |
| Blow Rise Limited | Wholesale & retail | 2025 |
| Blown Away Limited | Other services | 2024 |
| Bloxsmart Ltd | Construction | 2020 |
| Bloxxuk Ltd | Wholesale & retail | 2023 |
| BLR Salon Ltd | Other services | 2025 |
| Blss AA Ltd | Wholesale & retail | 2025 |
| BLT Logistics Recruitment Ltd | Administrative & support | 2019 |
| Bltnm Ltd | Wholesale & retail | 2026 |
| BLU Chip Limited | Financial services | 2020 |
| BLU ENZ Ltd | Extraterritorial | 2023 |
| Blu's Case Creations Ltd | Wholesale & retail | 2026 |
| Blubird Properties Limited | Real estate | 2023 |