| British Capital Offices (Four) Ltd | Real estate | 2025 |
| British Capital Offices (Nine) Ltd | Real estate | 2026 |
| British Capital Offices (One) Ltd | Real estate | 2024 |
| British Capital Offices (Seven) Ltd | Real estate | 2025 |
| British Capital Offices (SIX) Ltd | Real estate | 2025 |
| British Capital Offices (TEN) Ltd | Real estate | 2026 |
| British Capital Offices (Three) Ltd | Real estate | 2024 |
| British Capital Offices (Twelve) Ltd | Real estate | 2026 |
| British Capital Offices (Two) Ltd | Real estate | 2024 |
| British Friends of Pakistan CIC | Education | 2023 |
| British Textile Biennial | Administrative & support | 2021 |
| Brititrade Solutions Ltd | Information & communication | 2023 |
| Briton Steel Forming Ltd | Manufacturing | 2025 |
| Brittok Ltd | Wholesale & retail | 2025 |
| BRN Investments Ltd | Real estate | 2024 |
| Broadmead Health Ltd | Financial services | 2021 |
| Brock Fabrics Limited | Extraterritorial | 2014 |
| Broker 360 Real Estate Limited | Information & communication | 2026 |
| Brompton Enterprise Limited | Wholesale & retail | 2025 |
| Bronze Casting Studio Ltd | Manufacturing | 2024 |
| Brook Estate Investment Ltd | Manufacturing | 2022 |
| Brookfield Dean Ltd | Professional & scientific | 2008 |
| Brookhouse Development Group (Blackburn) CIC | Other services | 2015 |
| Brookhouse Foods Ltd | Hospitality | 2025 |
| Brooks Products Ltd | Extraterritorial | 2025 |
| Brookside (Old Langho) Maintenance Limited | Professional & scientific | 1992 |
| Brookstone Developments Limited | Construction | 2020 |
| Brookview Consultancy Ltd | Professional & scientific | 2026 |
| Brookview Motorgroup Ltd | Wholesale & retail | 2025 |
| Brosen Limited | Financial services | 2019 |
| Brotherton Hair Ltd | Other services | 2026 |
| Broughton Business Park Ltd | Real estate | 2016 |
| Brow Beauty Limited | Other services | 2023 |
| Brown Draycoat Limited | Other services | 2020 |
| Brown Street Vapes Ltd | Other services | 2023 |
| Brownhill Playgroup Limited | Education | 2009 |
| Brownhill PUB Limited | Hospitality | 2025 |
| Brownhvsolutions Limited | Manufacturing | 2024 |
| Brufc Ltd | Arts & recreation | 2015 |
| Brunisenda Limited | Administrative & support | 2005 |
| Brunson AI Ltd | Information & communication | 2026 |
| Brunswick Glass Limited | Wholesale & retail | 1989 |
| Brunton Training and Consultancy Ltd | Other services | 2024 |
| Brush&Polish Limited | Administrative & support | 2014 |
| Bryan LEE Building Contractors Limited | Construction | 2000 |
| Bryan Street Chippy Ltd | Hospitality | 2021 |
| Bryant Road News & Grocers Limited | Administrative & support | 2014 |
| BS Property Holdings Limited | Professional & scientific | 2009 |
| BSA Media Ltd | Professional & scientific | 2021 |
| BSR Retailers Limited | Wholesale & retail | 2024 |
| BTC Distribution Ltd | Construction | 2011 |
| Bubble Wrap Shop (Blackburn) Limited | Wholesale & retail | 2024 |
| Budget Buddy (NW) Ltd | Wholesale & retail | 2026 |
| Build & Roof Intelligence Services Ltd | Construction | 2009 |
| Build a Future CIC | Construction | 2025 |
| Build Ahead Ltd | Construction | 2024 |
| Build Assist Ltd | Construction | 2011 |
| Build Estimate Limited | Professional & scientific | 2024 |
| Builders Merchant Supplies Ltd | Financial services | 2020 |
| Bull Duck Property Management Limited | Households | 2017 |
| Bull Factory Ltd | Wholesale & retail | 2025 |
| Bullen Construction Limited | Construction | 2022 |
| Bulwark Security Services Limited | Administrative & support | 2016 |
| Bumble B Accountancy Services Ltd | Professional & scientific | 2022 |
| Bumble Bees Nursery (Blackburn) Limited | Education | 2015 |
| Bumble Consultancy Limited | Professional & scientific | 2019 |
| Buncer Lane Pharma Limited | Health & social care | 2019 |
| Bundle Laundry UK Ltd | Information & communication | 2019 |
| Buraq Trading NW Ltd | Wholesale & retail | 2023 |
| Burger Bros 786 Limited | Hospitality | 2020 |
| Burger Cafe Ltd | Hospitality | 2019 |
| Burgershaq Limited | Hospitality | 2025 |
| Burgess GAS Services Limited | Construction | 2020 |
| Burgess Property Group Limited | Real estate | 2024 |
| BURGRILL74 Ltd | Hospitality | 2023 |
| Burhan Forecourts Ltd | Administrative & support | 2022 |
| Burke & OX Ltd | Construction | 2024 |
| Burn Cars Ltd | Transport & logistics | 2023 |
| Burnhart Ltd | Real estate | 2018 |
| Burnley Road Crawshawbooth Management Ltd | Households | 2008 |
| Burnside Properties (Oswaldtwistle) Ltd | Construction | 2023 |
| Burts Ltd | Wholesale & retail | 2018 |
| Bury Brewery Company,Limited(The) | Hospitality | 1861 |
| Bus&Coach World Ltd | Manufacturing | 2006 |
| Business One Page Plan Ltd | Financial services | 2012 |
| Business Post Limited | Transport & logistics | 2023 |
| Business Solutions (NW) Ltd | Administrative & support | 2018 |
| Business Tree Enterprise Ltd | Wholesale & retail | 2024 |
| Business Vector Limited | Professional & scientific | 2002 |
| Butlers Delph Limited | Professional & scientific | 1991 |
| Butterfly Foods and Packaging Ltd | Wholesale & retail | 2019 |
| Butty Shop Limited(The) | | 1986 |
| BUX Buildings Limited | Construction | 2014 |
| BUX Enterprises Ltd | Wholesale & retail | 2025 |
| BUX Incorporated Limited | Real estate | 2013 |
| Buxa Limited | Education | 2024 |
| Buxx Mercantile Ltd | Wholesale & retail | 2026 |
| Buy ANY Cars Ltd | Wholesale & retail | 2026 |
| Buy Wright Ltd | Wholesale & retail | 2020 |
| Buy-Meds Ltd | Wholesale & retail | 2021 |