| Blue FLY Interiors Limited | Construction | 2017 |
| Blue Habour Developments Ltd | Construction | 2026 |
| Blue Harbor Ltd | Construction | 2023 |
| Blue Homes Care Limited | Construction | 2023 |
| Blue Horizon Coaches Ltd | Transport & logistics | 2026 |
| Blue Inn Ltd | Professional & scientific | 2013 |
| Blue JAY UK Properties Ltd | Real estate | 2024 |
| Blue Key Holdings Ltd | Real estate | 2026 |
| Blue Lagoon Skin Science UK Limited | Wholesale & retail | 2022 |
| Blue Lion Trading Ltd | Hospitality | 2026 |
| Blue Mango Cars Limited | Extraterritorial | 2016 |
| Blue Moon Europa Co Limited | Transport & logistics | 2025 |
| Blue Ocean London Ltd | Hospitality | 2026 |
| Blue Oceans Investment UK Limited | Real estate | 2021 |
| Blue Orchid Asset Ltd | Real estate | 2022 |
| Blue Parrot Margate Ltd | Hospitality | 2025 |
| Blue Peak GT Ltd | Wholesale & retail | 2026 |
| Blue Peak Traders Limited | Wholesale & retail | 2025 |
| Blue Reef Estates Ltd | Real estate | 2024 |
| Blue Rock Care Ltd | Health & social care | 2023 |
| Blue Rock International Ltd | Professional & scientific | 2021 |
| Blue Sapphire Limited | Wholesale & retail | 2025 |
| Blue Seahorse Properties Limited | Real estate | 2015 |
| Blue Shift Electrical Ltd | Construction | 2025 |
| Blue Sky Business Advice Limited | Professional & scientific | 2014 |
| Blue Sky Foundation | Education | 2013 |
| Blue Sky Media Productions Ltd | Information & communication | 2009 |
| Blue Star Construction Limited | Construction | 2025 |
| Blue Turnip Ltd | Wholesale & retail | 2023 |
| Blue Water Freight Limited | Transport & logistics | 2013 |
| Bluebell Aesthetics Clinic Ltd | Health & social care | 2019 |
| Bluebell Apps Ltd | Information & communication | 2024 |
| Bluebell Dental Practice Limited | Health & social care | 2010 |
| Bluebell Health Holdings Ltd | Health & social care | 2020 |
| Bluebell Hills Properties Limited | Real estate | 2019 |
| Bluebell Residential Childcare Limited | Health & social care | 2025 |
| Bluebell Wealth Management Ltd | Households | 2016 |
| Bluebells Limited | Construction | 1998 |
| Bluebelltame Ltd | Real estate | 2015 |
| Blueberry Gardens Property Ltd | Real estate | 2015 |
| Bluebex Coffee Limited | Hospitality | 2025 |
| Bluebird Clinical Limited | Health & social care | 2024 |
| Bluebird Momentum Limited | Real estate | 2026 |
| Bluebird Security Services Ltd | Administrative & support | 2021 |
| Bluechip Wealth Partners Limited | Real estate | 2014 |
| Bluecresent LLC Limited | Information & communication | 2023 |
| Bluefields Publishing Limited | Professional & scientific | 2011 |
| Bluegrace Investments Limited | Real estate | 2017 |
| Bluegrade Properties Limited | Real estate | 2003 |
| Bluehaven Recruitment Solutions Ltd | Administrative & support | 2025 |
| Blueline Int'L Limited | Wholesale & retail | 2013 |
| Blueline Luxury Coach Limited | Transport & logistics | 2014 |
| Bluemilli Ltd | Health & social care | 2018 |
| Bluemoon Europa Co UK Ltd | Wholesale & retail | 2026 |
| Bluemoon Luxuries Ltd | Administrative & support | 2022 |
| Bluemor Properties Limited | Real estate | 2025 |
| Bluepeak FM Ltd | Administrative & support | 2025 |
| Blueprint P.C.M. Limited | Professional & scientific | 1999 |
| Bluerock Inc Ltd | Hospitality | 2018 |
| Bluesky UK Services Ltd | Administrative & support | 2018 |
| Bluestone FM Ltd | Construction | 2018 |
| Bluestone Inc Ltd | Information & communication | 2016 |
| Bluestone International Investments Limited | Real estate | 2021 |
| Bluestone Investments Ltd | Real estate | 2019 |
| Bluett & Co. Limited | Manufacturing | 1958 |
| Bluewave Builders Ltd | Construction | 2024 |
| Bluewave Real Estate Ltd | Real estate | 2024 |
| Bluewire International Ltd | Manufacturing | 2014 |
| Bluewood Auto Group Ltd | Wholesale & retail | 2026 |
| Blueworld Real Estate Ltd | Construction | 2023 |
| Bluezone Development Ltd | Real estate | 2024 |
| Bluflare Solutions Limited | Information & communication | 2014 |
| Bluless Limited | Wholesale & retail | 2024 |
| Blurace Ltd | Other services | 2021 |
| Blushush Technologies Ltd | Professional & scientific | 2023 |
| Blutech Universal Ltd | Wholesale & retail | 2020 |
| Bluverraholdings Limited | Wholesale & retail | 2025 |
| BM Business Ltd | Wholesale & retail | 2017 |
| BM Construction (Havering) Ltd | Construction | 2010 |
| BM Estate Investments One Ltd | Real estate | 2026 |
| BM Estate Investments Two Ltd | Real estate | 2026 |
| BM Smart Ltd | Wholesale & retail | 2023 |
| BM1 Construction Ltd | Construction | 2024 |
| BMA Freehold Limited | Real estate | 2010 |
| BMA International Ltd. | Administrative & support | 2017 |
| BMC Consultants Ltd | Professional & scientific | 2006 |
| Bmcq Ltd | Wholesale & retail | 2023 |
| Bmcv Electrical Limited | Construction | 2025 |
| Bmcv Holdings Limited | Real estate | 2020 |
| BMD Property Management Limited | Real estate | 2021 |
| BMG Home Improvement Limited | Construction | 2021 |
| BMI Pro UK Ltd | Construction | 2020 |
| BMK 21 Ltd | Transport & logistics | 2021 |
| Bmlb Limited | Professional & scientific | 2014 |
| BMM Construction Ltd | Construction | 2024 |
| BMO Conglomerate Limited | Extraterritorial | 2022 |
| BMO Eventz Limited | Hospitality | 2022 |
| Bmrs Investment Limited | Real estate | 2024 |
| BN Management Consultancy Limited | Information & communication | 2013 |
| BNB Limited | Other services | 2009 |