| Better Places Property Limited | Real estate | 2024 |
| Better Tomorrow (U.K) Ltd | Real estate | 2025 |
| Beverley Road Super Store Limited | Wholesale & retail | 2025 |
| Bevlan Holdings Limited | Wholesale & retail | 2018 |
| BEW Supplies Limited | Wholesale & retail | 2015 |
| Bexem Ltd | Information & communication | 2021 |
| Bexville Limited | | 1975 |
| Beyond Border Services Ltd | Professional & scientific | 2024 |
| BFL Pennine Ltd | Arts & recreation | 2010 |
| Bflyuk Ltd | Manufacturing | 2017 |
| BG Sports and Media Limited | Information & communication | 2023 |
| BGR Surfacing Ltd | Construction | 2017 |
| Bgreenn Limited | Construction | 2010 |
| BH2 Medical Ltd | Health & social care | 2026 |
| Bhamjeefba Ltd | Wholesale & retail | 2026 |
| Bhamjees Limited | Manufacturing | 2017 |
| Bharucha Ltd | Households | 2025 |
| Bhayat Joinery Ltd | Construction | 2024 |
| Bhbs Consulting Engineers Limited | Professional & scientific | 2002 |
| BHF Designs Limited | Wholesale & retail | 2015 |
| Bhojani Ventures Ltd | Real estate | 2025 |
| Bhora Properties Ltd | Real estate | 2021 |
| Bias Exhibitions Ltd | Administrative & support | 2023 |
| Bibby Civils Ltd | Wholesale & retail | 2020 |
| Bibi Healthcare Ltd | Administrative & support | 2019 |
| Bibi Interiors Ltd | Other services | 2008 |
| Bickerton Consulting Limited | Financial services | 2003 |
| BID Home Limited | Real estate | 2021 |
| Big B'S Blackburn Ltd | Wholesale & retail | 2024 |
| Big Box Small Box Storage Limited | Transport & logistics | 2017 |
| Big C Projects Limited | Professional & scientific | 2006 |
| Big Dollor Foods Ltd | Hospitality | 2023 |
| Bigh Consultancy Firm Limited | Wholesale & retail | 2025 |
| Bilal Hajees Drinks Ltd | Wholesale & retail | 2026 |
| Bilal Hussain Limited | Health & social care | 2017 |
| Bilicious Sweets & Treats Limited | Wholesale & retail | 2025 |
| Bilitik Ltd | Health & social care | 2014 |
| Bill Rawstron Legal Services Ltd | Professional & scientific | 2023 |
| Billinge Crest Developments Ltd | Construction | 2025 |
| Billinge Investments LLP | | 2007 |
| Billinge Ventures Limited | Real estate | 2023 |
| Bims Education UK Ltd | Professional & scientific | 2025 |
| Binkuraish Ltd | Wholesale & retail | 2023 |
| Biotraining Club Ltd | Other services | 2024 |
| Birch Health & Wellness Limited | Health & social care | 2020 |
| Birchwood Childrens Services Limited | Public administration | 2019 |
| Birchwood Education Holdings Limited | Financial services | 2025 |
| Bird Bidness Ltd | Wholesale & retail | 2025 |
| Birdhouz Dipndrip Ltd | Hospitality | 2026 |
| Birdy's Chicken and Pizza Ltd | Hospitality | 2019 |
| Birkenhead Project Company NO.1 Limited | Energy | 2026 |
| Birtannia Trading Limited | Wholesale & retail | 2018 |
| Bishop PUB Company Limited | Hospitality | 2023 |
| Bishops Financial Planning Limited | Financial services | 2015 |
| Bismillah Associates Limited | Health & social care | 2012 |
| Bismillah Housing Solutions Limited | Hospitality | 2025 |
| Bismillah Jewellers Ltd | Wholesale & retail | 2018 |
| Bismillah Limited | Administrative & support | 2010 |
| Bismillah Personal Holdings Limited | Financial services | 2021 |
| Bismillah Properties (Blackburn) Limited | Real estate | 2021 |
| Bispham Hall Brick & Terra Cotta Company Limited | Real estate | 1925 |
| BIT Overwrite Limited | Information & communication | 2024 |
| BITM93 Ltd | Transport & logistics | 2026 |
| BIYA26 Ltd | Real estate | 2025 |
| Bizlockr Limited | Administrative & support | 2017 |
| BJ Health Care Ltd | Health & social care | 2015 |
| BJ Technical Solutions Limited | Professional & scientific | 2007 |
| Bjg-Ecommerce Ltd | Wholesale & retail | 2025 |
| BK Mechanical Services Limited | Construction | 2025 |
| Bkamzn Ltd | Wholesale & retail | 2024 |
| BKS Books Limited | Professional & scientific | 2019 |
| BKS for Business Ltd | Professional & scientific | 2012 |
| BL Cabinets Ltd | Manufacturing | 2015 |
| Black 33 Limited | Real estate | 2025 |
| Black Horse Tavern Ltd | Hospitality | 2023 |
| Black Horse Travel Ltd | Extraterritorial | 2025 |
| Black Monkey 1 Limited | Hospitality | 2017 |
| Black Stone Property Lettings Ltd | Extraterritorial | 2023 |
| Black&Greyclothing Limited | Manufacturing | 2023 |
| Blackburn & Darwen Community Transport Ltd | Construction | 2011 |
| Blackburn & Darwen Dial-A-Ride CIC | Transport & logistics | 2011 |
| Blackburn & District Supported Housing Limited | Health & social care | 1997 |
| Blackburn & Ribble Glass Limited | Construction | 2005 |
| Blackburn & Ribble Window Frames Limited | Manufacturing | 2020 |
| Blackburn and Darwen District Without Abuse Limited | Education | 2006 |
| Blackburn Appliances Ltd | Wholesale & retail | 2020 |
| Blackburn Arts Promotion Ltd | Professional & scientific | 2026 |
| Blackburn Bargains Limited | Wholesale & retail | 2023 |
| Blackburn Bearings Ltd | Professional & scientific | 2026 |
| Blackburn CAR2025 Limited | Wholesale & retail | 2025 |
| Blackburn Caravan Services Ltd | Manufacturing | 2019 |
| Blackburn Caravans Limited | Wholesale & retail | 2023 |
| Blackburn Carpet Centre Ltd | Wholesale & retail | 2015 |
| Blackburn Cathedral Developments | Construction | 2001 |
| Blackburn Cathedral Enterprises Limited | Wholesale & retail | 2018 |
| Blackburn Cathedral Trust | Other services | 2009 |
| Blackburn Chemicals (Holdings) Limited | Real estate | 2004 |
| Blackburn Chemicals Limited | Manufacturing | 1973 |
| Blackburn Cleaning Services Ltd | Transport & logistics | 2026 |
| Blackburn Commercial Estates Limited | Construction | 2010 |