| Blockdeed Property Management Limited | Hospitality | 1988 |
| Blooming Petals Ltd | Wholesale & retail | 2023 |
| Blue Door Property Solutions Ltd | Real estate | 2017 |
| Blue Driving School Ltd | Education | 2024 |
| Blue Peanut Limited | Health & social care | 2015 |
| Blue Post Production Company Limited | Extraterritorial | 2018 |
| Blue Regalia Ltd | Wholesale & retail | 2023 |
| Blue Rose Plumbing and Heating Contractors Ltd | Extraterritorial | 2026 |
| Blue Skies Outreach Ltd | Health & social care | 2023 |
| Blue Sky Assemblies Ltd | Manufacturing | 2009 |
| Blueprint Estimations Limited | Information & communication | 2024 |
| BMB Inspection Ltd | Professional & scientific | 2014 |
| BMD Property NW Ltd | Real estate | 2026 |
| BN Trading (NW) Ltd | Hospitality | 2018 |
| BN1 Media Ltd | Information & communication | 2017 |
| BNI Care Ltd | Administrative & support | 2026 |
| Body Care Brands UK Limited | Wholesale & retail | 2019 |
| Body Mechanic MSK Ltd | Health & social care | 2024 |
| Body Wars Ltd | Arts & recreation | 2007 |
| Bogdan Ilie Ltd | Transport & logistics | 2025 |
| Bomadu Marketplace Limited | Information & communication | 2019 |
| Bombay HUT Burnley Limited | Hospitality | 2018 |
| Bond & Bloom Limited | Wholesale & retail | 2015 |
| Bond Property Developments Trawden Limited | Real estate | 2007 |
| Bond ST Coffee Ltd | Hospitality | 2022 |
| Bondlink Limited | Wholesale & retail | 1977 |
| Book Surf Limited | Wholesale & retail | 2013 |
| Boon FM Ltd | Construction | 2022 |
| Boothman Park Estates Limited | Hospitality | 2012 |
| Booths Flooring Ltd | Wholesale & retail | 2022 |
| Booths Furniture and Interiors Ltd | Wholesale & retail | 2024 |
| Border Stoneware Limited | Wholesale & retail | 2013 |
| Bosken Ltd | Other services | 2024 |
| Boss Babes Clinic Ltd | Other services | 2019 |
| Boss Cleaning Specialist Ltd | Administrative & support | 2023 |
| Bottega Prelibato Limited | Hospitality | 2005 |
| Bouncy Castles R US Ltd | Extraterritorial | 2024 |
| Bowater Architectural Limited | Extraterritorial | 2010 |
| Bowland Avenue Limited | Real estate | 2019 |
| Bowland Avenue Management Company Limited | Real estate | 2019 |
| Bowland Forest Farm Ltd | Real estate | 2019 |
| Boyle Holdings Limited | Professional & scientific | 2020 |
| Bozvans Limited | Wholesale & retail | 2026 |
| BP Properties 247 Ltd | Construction | 2019 |
| BPM SFX Holdings Limited | Financial services | 2026 |
| BPM SFX Limited | Administrative & support | 2009 |
| BPN Catering Ltd | Hospitality | 2023 |
| BPS Direct Limited | Wholesale & retail | 2018 |
| BR Fish and Chips Ltd | Hospitality | 2013 |
| Brackmills MOT Centre Ltd | Manufacturing | 2013 |
| Brad Trans International Limited | Transport & logistics | 1994 |
| Bradley Building Supplies Ltd | Wholesale & retail | 2018 |
| Bradley Launderette Ltd | Other services | 2025 |
| Bradshawsqualitycare Ltd | Health & social care | 2024 |
| Brain Box Academy Ltd | Education | 2021 |
| Braith Hire Ltd | Construction | 2021 |
| Braith Holdings Ltd | Administrative & support | 2014 |
| Braith Investments Ltd | Real estate | 2015 |
| Brand Partners Recruitment Ltd | Administrative & support | 2022 |
| Brandemic Ltd | Wholesale & retail | 2024 |
| Brandkraft Ltd | Professional & scientific | 2025 |
| Brandy Cleaning Services Ltd | Administrative & support | 2024 |
| Brave New World Ltd | Information & communication | 2020 |
| Braxton Construction Ltd | Construction | 2021 |
| Brays Boss Scaffolding Ltd | Construction | 2025 |
| Brentane International Limited | Wholesale & retail | 2025 |
| Brentwood Homecare Limited | Health & social care | 2007 |
| Brian Hanson Ltd | Professional & scientific | 2013 |
| Briars Accountants Ltd | Professional & scientific | 2024 |
| Bridge Healthcare Ltd | Health & social care | 2018 |
| Bridge Renewables Limited | Wholesale & retail | 1996 |
| Briercliffe Chippery Ltd | Hospitality | 2025 |
| Briercliffe Halal Meat Shop Ltd | Wholesale & retail | 2025 |
| Briercliffe Laundrette Ltd | Other services | 2019 |
| Briercliffe Motors Limited | Wholesale & retail | 2021 |
| Briercliffe Road Dental Practice Limited | Health & social care | 2009 |
| Bright Energy Eco Ltd | Information & communication | 2025 |
| Bright Energy Solutions (NW) Ltd | Construction | 2024 |
| Bright Futures (2003) Limited | Health & social care | 2002 |
| Bright Futures Property Ltd | Real estate | 2019 |
| Bright Lites UK Limited | Arts & recreation | 2009 |
| Brigtin Limited | Professional & scientific | 2014 |
| Britannia Multi-Goods Ltd | Wholesale & retail | 2025 |
| Britannia Properties | | 2000 |
| Britannia Upvc Supplies Ltd | Construction | 2022 |
| British Velvets Limited | Manufacturing | 1955 |
| Britpak Lancashire Ltd | Manufacturing | 2025 |
| Brixbox Ltd | Manufacturing | 2023 |
| Brixey Pizza Limited | Hospitality | 2022 |
| Broadband Market Limited | Information & communication | 2022 |
| Broadgreen Building Supplies Limited | Wholesale & retail | 1979 |
| Brook & Field Business Solutions Ltd | Professional & scientific | 2020 |
| Brook & Field Properties Ltd | Real estate | 2016 |
| Brooks Engineering NW Ltd | Professional & scientific | 2024 |
| Brookside Motor Group Limited | Wholesale & retail | 2026 |
| Brookwood Motor Services Ltd | Wholesale & retail | 2018 |
| Brothers Coffee Co. Ltd | Manufacturing | 2026 |
| Brothers Takeaway Burnley Ltd | Hospitality | 2024 |
| Brown Dog Brewing Company Limited | Hospitality | 2019 |
| Browns Garden Buildings Limited | Manufacturing | 2006 |