| Blackburn Courier Ltd | Transport & logistics | 2021 |
| Blackburn Cricket Academy Ltd | Arts & recreation | 2025 |
| Blackburn Diocesan Board of Finance Limited | Other services | 1927 |
| Blackburn DIY Limited | Other services | 2014 |
| Blackburn Empire Theatre Ltd | Arts & recreation | 1979 |
| Blackburn Eyecare Limited | Health & social care | 2013 |
| Blackburn Festival of Light CIC | Arts & recreation | 2017 |
| Blackburn Foods Ltd | Wholesale & retail | 2024 |
| Blackburn GAS Plumbing and Heating Services Limited | Construction | 2013 |
| Blackburn Grocers Ltd | Wholesale & retail | 2020 |
| Blackburn Hand Carwash Ltd | Administrative & support | 2025 |
| Blackburn Health Holdings Ltd | Wholesale & retail | 2025 |
| Blackburn Heating Spares Group Ltd | Construction | 2023 |
| Blackburn Jaffa Ltd | Hospitality | 2023 |
| Blackburn Meadows Costruction Ltd | Construction | 2025 |
| Blackburn Model Supplies Limited | Wholesale & retail | 1987 |
| Blackburn Optical Centre Ltd | Administrative & support | 2013 |
| Blackburn Phone Repairs Ltd | Other services | 2019 |
| Blackburn Property Management Ltd | Real estate | 2018 |
| Blackburn Road Medical Properties Ltd | Real estate | 2013 |
| Blackburn Rovers Community Trust | Education | 2006 |
| Blackburn Rovers Women Football Club Limited | Arts & recreation | 2019 |
| Blackburn Shopfitters Ltd | Professional & scientific | 2000 |
| Blackburn Snooker Ltd | Arts & recreation | 2023 |
| Blackburn Special Build Ltd | Construction | 2026 |
| Blackburn Store Limited | Wholesale & retail | 2022 |
| Blackburn Tool Hire North West Ltd | Wholesale & retail | 2020 |
| Blackburn Trade Group Ltd | Wholesale & retail | 2025 |
| Blackburn Travels Limited | Administrative & support | 2024 |
| Blackburn Valeting Services Ltd | Wholesale & retail | 2015 |
| Blackburn Vaults Ltd | Administrative & support | 2021 |
| Blackburn Vineyard Church | Other services | 2013 |
| Blackburn Welding Services Ltd | Manufacturing | 2021 |
| Blackburn Windows Limited | Manufacturing | 2024 |
| Blackburn With Darwen Carers Service Ltd | Health & social care | 2006 |
| Blackburn With Darwen Council for Voluntary Service | Other services | 1991 |
| Blackburn With Darwen Developments Ltd | Construction | 2021 |
| Blackburn Youth Zone | Other services | 2009 |
| Blackk Media Ltd | Professional & scientific | 2023 |
| Blackpool Homes Ltd | Real estate | 2017 |
| Blackpool Road Construction Ltd | Construction | 2025 |
| Blackrock Rehab Ltd | Professional & scientific | 2024 |
| Bladex Detailing Ltd | Wholesale & retail | 2026 |
| Blakeburn Ltd | Wholesale & retail | 2024 |
| Blakewater Homecare Services Ltd | Health & social care | 2020 |
| Blakewater Medicals Ltd | Health & social care | 2017 |
| Blakewater Solicitors Ltd | Professional & scientific | 2006 |
| Blakewater Surgery Limited | Real estate | 2025 |
| Blanche Electrical Limited | Administrative & support | 2017 |
| Blanq Canvas Ltd | Wholesale & retail | 2022 |
| Blazeblockers Limited | Construction | 2025 |
| Bleubolt Limited | Wholesale & retail | 2004 |
| Blezard Therapy Services Limited | Health & social care | 2016 |
| Bling Bling Clothing Ltd | Wholesale & retail | 2026 |
| Bliss Distribution Limited | Wholesale & retail | 2006 |
| Bliss Medic Healthcare Ltd | Other services | 2023 |
| Bliss Medic Holding Ltd | Other services | 2023 |
| Bliss Medic Property Ltd | Other services | 2023 |
| Bliss UK Holdings Limited | Wholesale & retail | 2017 |
| Blissful Bites Blackburn Ltd | Wholesale & retail | 2024 |
| Blockchain Assets Ltd | Information & communication | 2017 |
| Blocktone Living Ltd | Wholesale & retail | 2025 |
| Bloomin Lovely (Blackburn) Limited | Wholesale & retail | 2026 |
| Bloomup Ltd | Wholesale & retail | 2026 |
| Blossoms and Whimsy Ltd | Other services | 2025 |
| Blowpack Ltd | Manufacturing | 2024 |
| Blox Distribution Ltd | Wholesale & retail | 2024 |
| Blox Group Limited | Administrative & support | 2020 |
| BLU ARK Ltd | Real estate | 2022 |
| BLU Marble Ltd | Professional & scientific | 2018 |
| Blue Bird Properties 2016 Ltd | Real estate | 2016 |
| Blue Bubble Games Ltd | Households | 2019 |
| Blue Factory Media Ltd | Information & communication | 2017 |
| Blue Hawk Studio Ltd | Wholesale & retail | 2020 |
| Blue Krystal Food Ltd | Wholesale & retail | 2024 |
| Blue Planet Heating Limited | Construction | 2020 |
| Blue Ridge International Limited | Wholesale & retail | 2025 |
| Blue Spark Holdings Limited | Manufacturing | 2008 |
| Blue Trip Private Hire Ltd | Transport & logistics | 2026 |
| Blue Valley Consulting Limited | Information & communication | 2010 |
| Blue Wren Property Ltd | Real estate | 2018 |
| Blueberry Design Limited | Professional & scientific | 2010 |
| Blueberry Sesame Ltd | Wholesale & retail | 2024 |
| Bluechip Digital Ltd | Wholesale & retail | 2020 |
| Bluedrop Security Limited | Administrative & support | 2013 |
| BM5STARS Solutions Ltd | Real estate | 2025 |
| BM7STARS Solutions Ltd | Real estate | 2025 |
| BMA Consultancy Limited | Information & communication | 2004 |
| Bmax Sports Limited | Administrative & support | 2017 |
| Bmbt Ltd | Transport & logistics | 2019 |
| BML Insight Solutions Limited | Professional & scientific | 2019 |
| BMS Import-Export Ltd | Financial services | 2022 |
| Bmya Ltd | Construction | 2025 |
| BNC Properties & Investments Ltd | Real estate | 2024 |
| BNS London Ltd | Wholesale & retail | 2023 |
| Boatyard Inn Bangor Ltd | Hospitality | 2026 |
| BOB Group Ltd | Financial services | 2026 |
| BOB on Content Limited | Administrative & support | 2024 |
| BOB the DOC Ltd | Real estate | 2025 |
| Boby Builders Construction Ltd | Construction | 2026 |