| BLR Construction Services Ltd | Construction | 2024 |
| BLU Crafts Ltd | Manufacturing | 2024 |
| BLU IVY Ltd | Hospitality | 2021 |
| BLU Planet Services Limited | Professional & scientific | 2025 |
| Blue Abyss Solutions Ltd | Information & communication | 2010 |
| Blue Arch Holdings Ltd | Financial services | 2020 |
| Blue Arch Homecare Group Limited | Health & social care | 2024 |
| Blue Arch Homecare Limited | Health & social care | 2018 |
| Blue Army Ltd | Manufacturing | 2024 |
| Blue Bear Storage & Distribution Ltd | Transport & logistics | 2022 |
| Blue Bede Property Ltd | Real estate | 2021 |
| Blue Chip Partners Limited | Real estate | 2025 |
| Blue Chip Textiles Ltd | Wholesale & retail | 2020 |
| Blue Chippy Ltd | Hospitality | 2013 |
| Blue Circle (HW) Limited | Professional & scientific | 1920 |
| Blue Claret Limited | Manufacturing | 2013 |
| Blue Coho Ltd | Administrative & support | 2014 |
| Blue Collar Ltd | Administrative & support | 2015 |
| Blue Court Leicester Ltd | Arts & recreation | 2026 |
| Blue Court Projects Ltd | Arts & recreation | 2025 |
| Blue Crown Construction Ltd | Construction | 2025 |
| Blue Diamond (Leicester) Ltd | Manufacturing | 2018 |
| Blue Dog PUB Company Ltd | Hospitality | 2025 |
| Blue Dojo Ltd | Professional & scientific | 2020 |
| Blue Dove Healthcare Services Ltd | Health & social care | 2025 |
| Blue Feather Properties Ltd | Real estate | 2021 |
| Blue FOG Technology Limited | Information & communication | 2017 |
| Blue FOX Energy and Electrical Services Ltd | Construction | 2025 |
| Blue FOX Laser and CNC Limited | Manufacturing | 2019 |
| Blue FOX Property Development Limited | Real estate | 2020 |
| Blue Gorilla Vape Ltd | Administrative & support | 2019 |
| Blue HAT Consulting Ltd | Information & communication | 2019 |
| Blue Horizon 2 Limited | Financial services | 2020 |
| Blue Horse Services Ltd | Transport & logistics | 2026 |
| Blue House Property Management Ltd | Real estate | 2022 |
| Blue Ice Motors Ltd | Wholesale & retail | 2021 |
| Blue INK Limited | Manufacturing | 2004 |
| Blue Kite Property Ltd | Real estate | 2012 |
| Blue Leaf Technologies UK Private Ltd | Information & communication | 2025 |
| Blue Light Card Ltd | Professional & scientific | 2008 |
| Blue Line Care Consult Ltd | Professional & scientific | 2026 |
| Blue Line Trans Ltd | Transport & logistics | 2016 |
| Blue Magik Limited | Wholesale & retail | 2010 |
| Blue Marble Research Limited | Professional & scientific | 2005 |
| Blue Marula Limited | Professional & scientific | 2016 |
| Blue Moon Foods Limited | Manufacturing | 2002 |
| Blue Moon Services Ltd | Administrative & support | 2022 |
| Blue Mountain General Trading UK Ltd | Wholesale & retail | 2023 |
| Blue Oak Fireplaces Ltd | Construction | 2025 |
| Blue Penguin Property Investments Limited | Real estate | 2021 |
| Blue Peter Club Limited | Hospitality | 2003 |
| Blue Peter Club PR Limited | Hospitality | 2013 |
| Blue Peter Spice Bar & Grill Limited | Hospitality | 2015 |
| Blue Planet Enterprises Limited | Professional & scientific | 2023 |
| Blue Point Leicester Ltd | Hospitality | 2025 |
| Blue Pyramid Investments Limited | Construction | 2000 |
| Blue Sapphire Properties Ltd | Real estate | 2018 |
| Blue Satin Limited | Real estate | 2009 |
| Blue Skies Accountancy Limited | Professional & scientific | 2003 |
| Blue Skip Hire Ltd | Water & waste | 2025 |
| Blue Sky Bookkeeping & Accounts Limited | Professional & scientific | 2025 |
| Blue Sky Fashion Limited | Manufacturing | 2020 |
| Blue Sky Homes Limited | Real estate | 2017 |
| Blue Sky Learning Services Ltd | Professional & scientific | 2023 |
| Blue Sky Properties Leicester Ltd | Construction | 2014 |
| Blue Slate Construction Ltd | Construction | 2024 |
| Blue Springs (Matlock) Limited | Extraterritorial | 2000 |
| Blue Star Care Ltd | Health & social care | 2021 |
| Blue Titan Labs Ltd | Information & communication | 2026 |
| Blue Vintage Limited | Wholesale & retail | 2018 |
| Blue Viper Technologies Ltd | Information & communication | 2025 |
| Blue VKR Investments Limited | Information & communication | 2013 |
| Blue Waste OIL Ltd | Water & waste | 2018 |
| Blue Water (Springs) Limited | Extraterritorial | 2000 |
| Blue Water Gardens Limited | Extraterritorial | 2000 |
| Blue Wheel Ltd | Real estate | 2021 |
| Blueace Solutions Ltd | Administrative & support | 2025 |
| Bluebat Limited | Manufacturing | 2014 |
| Bluebell Clothing Brand Limited | Wholesale & retail | 2025 |
| Bluebell Nursery School Stoughton Limited | Education | 2012 |
| Bluebells of Ratby Limited | Health & social care | 2021 |
| Blueberry Holding Company Limited | Administrative & support | 2008 |
| Blueberry Interiors Limited | Wholesale & retail | 2021 |
| Bluebird Change and Communications Ltd | Professional & scientific | 2024 |
| Bluebrick Estates Limited | Real estate | 2011 |
| Bluebrick Investments Ltd | Real estate | 2017 |
| Bluebridge Freight Ltd | Transport & logistics | 2025 |
| Bluecloud Logistics Limited | Wholesale & retail | 2014 |
| Bluecrest Casters Ltd | Wholesale & retail | 2024 |
| Bluecrest Ventures Holdings Ltd | Financial services | 2026 |
| Bluecrow Joinery Limited | Construction | 2018 |
| Bluecrow Projects Limited | Construction | 2008 |
| Bluedil International Limited | Professional & scientific | 2020 |
| Bluefield Consultancy Ltd | Information & communication | 2011 |
| Bluefin Sustainability Limited | Professional & scientific | 2025 |
| Bluefox (Loughborough) Limited | Professional & scientific | 2007 |
| Bluelight Wills and Estate Planning Limited | Professional & scientific | 2019 |
| Bluemetric Limited | Professional & scientific | 2025 |
| Bluephoneproduction Limited | Information & communication | 2025 |
| Blueprint Brickwork Ltd | Construction | 2021 |