| Blue Lagoon Property Management Limited | Administrative & support | 2012 |
| Blue Lake Developments Limited | Construction | 2022 |
| Blue Leda Limited | Real estate | 2001 |
| Blue Line Star Ltd | Wholesale & retail | 2019 |
| Blue Line Training Ltd | Education | 2019 |
| Blue Magic Design Ltd | Wholesale & retail | 2016 |
| Blue Magic Ltd | Wholesale & retail | 2021 |
| Blue Magpie Nest Ltd | Wholesale & retail | 2024 |
| Blue Mahoe Property Ltd | Real estate | 2020 |
| Blue Marlin Caribbean Ltd | Hospitality | 2015 |
| Blue Mineral Recruitment Management Ltd | Professional & scientific | 2025 |
| Blue Mineral Risk Management Ltd | Administrative & support | 2022 |
| Blue Mini Market Ltd | Wholesale & retail | 2025 |
| Blue Mountain Rentals Limited | Professional & scientific | 1998 |
| Blue Mountain Vending Ltd | Wholesale & retail | 2026 |
| Blue Mountain Water Limited | Wholesale & retail | 1994 |
| Blue N Green Limited | Other services | 2023 |
| Blue Nailers Arms Ltd | Hospitality | 2023 |
| Blue Network Ltd | Real estate | 2018 |
| Blue Oak Property Group Ltd | Real estate | 2025 |
| Blue Ocean Academy Liverpool Limited | Education | 2026 |
| Blue Orange Arts Ltd | Arts & recreation | 2011 |
| Blue Orange Theatre Limited | Real estate | 2007 |
| Blue Orbit Ltd | Information & communication | 2025 |
| Blue OWL Education Ltd | Education | 2022 |
| Blue Pagoda Group Ltd | Professional & scientific | 2021 |
| Blue Parking Ltd | Other services | 2026 |
| Blue Path Property Ltd | Real estate | 2022 |
| Blue Pearl (Grantham) Ltd | Hospitality | 2022 |
| Blue Penguin Textiles Ltd | Wholesale & retail | 2022 |
| Blue Phones UK Ltd | Wholesale & retail | 2024 |
| Blue Piano Limited | Hospitality | 2010 |
| Blue PIE (UK) Limited | Financial services | 2014 |
| Blue PIE UK Properties Limited | Real estate | 2016 |
| Blue Print Healthcare Ltd | Health & social care | 2025 |
| Blue Properties and Development Limited | Households | 2025 |
| Blue Puma Marketing Limited | Administrative & support | 2012 |
| Blue Rain Advance Limited | Public administration | 2026 |
| Blue Rain Consultancy Ltd | Information & communication | 2022 |
| Blue Red Brick Ltd | Real estate | 2024 |
| Blue Ridge Property Developments Limited | Construction | 2026 |
| Blue Rock Paper Merchants Ltd | Other services | 2019 |
| Blue Sapphire Enterprises Ltd | Professional & scientific | 2014 |
| Blue Sapphire Essentials Ltd | Wholesale & retail | 2025 |
| Blue Scaling Limited | Professional & scientific | 2021 |
| Blue Seal Limited | Wholesale & retail | 1997 |
| Blue Sells Ltd | Wholesale & retail | 2025 |
| Blue Serve Ltd | Education | 2018 |
| Blue Shark Ltd | Wholesale & retail | 2026 |
| Blue Skies Developments Limited | Real estate | 2024 |
| Blue Sky Academy Ltd | Education | 2019 |
| Blue Sky Family Limited | Real estate | 2021 |
| Blue Sky Homecare Ltd | Public administration | 2026 |
| Blue Sky Products Ltd | Professional & scientific | 2023 |
| Blue Sky Wellness Ltd | Wholesale & retail | 2023 |
| Blue Slate Ltd | Professional & scientific | 2016 |
| Blue Sora Limited | Real estate | 2025 |
| Blue Spot Radio Limited | Information & communication | 2024 |
| Blue Square Acquisitions Limited | Construction | 2009 |
| Blue Square Assets (Cleobury Mortimer) Limited | Real estate | 2011 |
| Blue Square Construction Limited | Real estate | 2011 |
| Blue Square Limited | Real estate | 2020 |
| Blue Square Penn Road Limited | Real estate | 2014 |
| Blue Star Clothing Limited | Wholesale & retail | 2014 |
| Blue Star Company Construction Ltd | Hospitality | 2019 |
| Blue Tartan Properties Limited | Real estate | 2025 |
| Blue Thorn Technology Ltd | Information & communication | 2002 |
| Blue Trading (UK) Ltd | Wholesale & retail | 2012 |
| Blue Trading Group Ltd | Financial services | 2026 |
| Blue Triangle Training Limited | Transport & logistics | 2016 |
| Blue Unicorn Kickboxing Academy Ltd | Education | 2022 |
| Blue Unicorn Limited | Education | 2025 |
| Blue Village Store Ltd | Wholesale & retail | 2025 |
| Blue Water Capital Limited | Financial services | 2017 |
| Blue Water Corporate Services Ltd | Administrative & support | 2026 |
| Blue Water Midlands Ltd | Hospitality | 2022 |
| Blue Water Trustees Limited | Professional & scientific | 2020 |
| Blue Whale Education & Training C.I.C. | Education | 2017 |
| Blue Whale Training Limited | Education | 2007 |
| Blue Wolf Security Ltd | Financial services | 2021 |
| Blue Worldwide Ltd | Wholesale & retail | 2014 |
| Blueartland Ltd | Wholesale & retail | 2025 |
| Bluebell Care Ltd | Extraterritorial | 2023 |
| Bluebell Developers Ltd | Real estate | 2019 |
| Bluebell Eco Energy Ltd | Construction | 2023 |
| Bluebell Group (Midlands) Limited | Financial services | 2025 |
| Bluebell Growth Limited | Real estate | 2022 |
| Bluebell Guest House Ltd | Hospitality | 2013 |
| Bluebell Hydro and Physio Limited | Health & social care | 2016 |
| Bluebell Legacy Limited | Financial services | 2024 |
| Bluebell Supported Housing Ltd | Real estate | 2026 |
| Bluebells Aesthetics (UK) Limited | Other services | 2019 |
| Bluebells Day Nursery (London) Ltd | Education | 2015 |
| Bluebells Incorp Limited | Administrative & support | 2021 |
| Bluebells Incorporated Ltd | Administrative & support | 2018 |
| Blueberry Consultants Holdings Limited | Information & communication | 2021 |
| Blueberry Consultants Limited | Information & communication | 1996 |
| Blueberry Enterprise Services Limited | Information & communication | 2016 |
| Blueberry Nursery Ltd | Health & social care | 2024 |
| Blueberry Production Limited | Information & communication | 2021 |