| Blue Sand Holidays Ltd. | Administrative & support | 2017 |
| Blue Scylla Consulting Limited | Professional & scientific | 2023 |
| Blue Scylla Property Limited | Real estate | 2024 |
| Blue Sheet Limited | Health & social care | 2007 |
| Blue Shell Consultancy Ltd | Professional & scientific | 2026 |
| Blue Skies Property Limited | Real estate | 2023 |
| Blue Skies Technology Limited | Information & communication | 2019 |
| Blue Sky Avenue Ltd | Real estate | 2023 |
| Blue Sky Commercial Advisory Ltd | Professional & scientific | 2025 |
| Blue Sky Inc Ltd | Administrative & support | 2016 |
| Blue Sky MCR Ltd | Hospitality | 2025 |
| Blue Sky Oilfield Supply & Services Ltd | Information & communication | 2023 |
| Blue Sky Post Limited | Information & communication | 2012 |
| Blue Sky Technology Century Limited | Information & communication | 2021 |
| Blue Slash Limited | Information & communication | 2014 |
| Blue Smiles Limited | Health & social care | 2024 |
| Blue Spot Tools Limited | Professional & scientific | 2004 |
| Blue Spring Dining Limited | Hospitality | 2025 |
| Blue Stag Cyber Limited | Information & communication | 2025 |
| Blue Star Empires Limited | Real estate | 2025 |
| Blue Star House Limited | Hospitality | 2022 |
| Blue Star Ocean Ltd | Transport & logistics | 2025 |
| Blue Stellar Ltd | Professional & scientific | 2017 |
| Blue Thunder Limited | Arts & recreation | 2015 |
| Blue Top Communications Ltd | Professional & scientific | 2018 |
| Blue Tree Savings Ltd | Professional & scientific | 2020 |
| Blue Voyage Ltd | Arts & recreation | 2021 |
| Blue Wale Ltd | Wholesale & retail | 2025 |
| Blue Water Logistics UK Limited | Transport & logistics | 2012 |
| Blue Water Shipping UK Limited | Transport & logistics | 2011 |
| Blue Wayze Ltd | Professional & scientific | 2022 |
| Blue Whale Sports UK Ltd | Arts & recreation | 2023 |
| Blue Whale Supermarket Limited | Wholesale & retail | 2021 |
| Blue Yard Limited | Other services | 2003 |
| Blue-Chip Property Developments Ltd. | Construction | 2017 |
| Blue-Sky Pathways Limited | Public administration | 2024 |
| Blue/Mandy Limited | Wholesale & retail | 2014 |
| Blue@Uk Ltd | Other services | 2022 |
| Bluebasket Limited | Wholesale & retail | 2022 |
| Bluebay Nutrition Ltd. | Extraterritorial | 2018 |
| Bluebell Cafe Ltd | Hospitality | 2021 |
| Bluebell Capital Investments Limited | Financial services | 2020 |
| Bluebell Compliance Limited | Professional & scientific | 2022 |
| Bluebell Homes Four Limited | Real estate | 2024 |
| Bluebell Homes Three Limited | Real estate | 2024 |
| Bluebell Meadows Management Ltd | Households | 2026 |
| Bluebelle Limited | Wholesale & retail | 2002 |
| Blueberry Consultancy Limited | Information & communication | 2014 |
| Blueberry Dental Surgery Limited | Health & social care | 2009 |
| Blueberry Therapeutics Limited | Professional & scientific | 2011 |
| Bluebird Golf Centre Ltd | Arts & recreation | 2014 |
| Bluebird Medical Services Ltd | Health & social care | 2021 |
| Bluebird Smart Homes Ltd | Wholesale & retail | 2023 |
| Bluebox Media Ltd | Information & communication | 2021 |
| Bluebrick Construction MCR Limited | Construction | 2024 |
| Bluebrick Properties Services Ltd | Real estate | 2025 |
| Bluebricks Homes Ltd | Real estate | 2020 |
| Bluebrige Ltd | Wholesale & retail | 2025 |
| Bluebrok Limited | Other services | 2010 |
| Bluecare Express Ltd | Wholesale & retail | 2014 |
| Bluechimp 22 Ltd | Wholesale & retail | 2021 |
| Bluechip Build Limited | Construction | 2022 |
| Bluechip General Trading Ltd | Extraterritorial | 2026 |
| Bluechip MCR Ltd | Real estate | 2026 |
| Bluecrate Limited | Transport & logistics | 2022 |
| Bluecrosslifecare Ltd | Public administration | 2018 |
| Bluedandra Ltd | Wholesale & retail | 2025 |
| Bluedoor Estates Ltd Ltd | Real estate | 2026 |
| Bluefields Medical Limited | Health & social care | 2023 |
| Bluefin MCR Ltd | Real estate | 2025 |
| Blueflame Engineering Solutions Ltd | Administrative & support | 2026 |
| Blueflame Properties Incorporated Ltd | Real estate | 2021 |
| Bluefoot Foods Limited | Wholesale & retail | 2001 |
| Blueforest Boutique Ltd | Wholesale & retail | 2024 |
| Bluefrisbee Limited | Professional & scientific | 2003 |
| Bluefyn Ltd | Wholesale & retail | 2020 |
| Bluegate Business Services Ltd | Professional & scientific | 2014 |
| Bluegate Capital Secured Income Fund LP | | 2009 |
| Bluegate Capital Secured Income Series 2 LP | | 2010 |
| Bluegyp Limited | Construction | 2006 |
| Bluehaven for Trading Ltd | Extraterritorial | 2025 |
| Bluehaven Medical Ltd | Health & social care | 2026 |
| Bluehention Ltd | Transport & logistics | 2019 |
| Bluehorn Medics Ltd | Health & social care | 2015 |
| Blueinc Ltd | Information & communication | 2023 |
| Blueinflux Ltd | Administrative & support | 2025 |
| Bluejoy PVT Ltd | Health & social care | 2016 |
| Bluekey Stays Limited | Real estate | 2025 |
| Bluekeysmcr Ltd | Real estate | 2026 |
| Bluelemon Qhse Ltd | Other services | 2019 |
| Bluelife Limited | Real estate | 1998 |
| Blueline Auto Hub Ltd | Wholesale & retail | 2026 |
| Blueline Healthcare Ltd | Health & social care | 2017 |
| Blueline Management Limited | Professional & scientific | 2009 |
| Blueline PVT Ltd | Hospitality | 2022 |
| Blueline Safety Ltd | Professional & scientific | 2025 |
| Bluelinetrading Ltd | Education | 2025 |
| Bluemoon Bedding Ltd | Wholesale & retail | 2014 |
| Bluemoon Leisure Audenshaw Ltd | Hospitality | 2022 |
| Bluemoon Textiles Ltd | Wholesale & retail | 2017 |