| BIZ Circle Ltd | Other services | 2025 |
| BIZ Consultancy Services Ltd | Professional & scientific | 2024 |
| BIZ Industrials Ltd | Real estate | 2017 |
| BIZ Manchester Ltd | Construction | 2015 |
| BIZ Women Ltd | Other services | 2021 |
| Biz-Parks Ltd | Real estate | 2015 |
| BIZ87 Ltd | Wholesale & retail | 2026 |
| Bizcatalyst Limited | Wholesale & retail | 2025 |
| Bizen Mart Ltd | Wholesale & retail | 2025 |
| Bizihealth Ltd | Construction | 2018 |
| Bizinnit Ltd | Information & communication | 2020 |
| Bizlivate Group Limited | Information & communication | 2025 |
| Bizmatrix Ltd | Professional & scientific | 2012 |
| Biznova Ltd | Professional & scientific | 2025 |
| Bizon Limited | Information & communication | 2021 |
| Bizsphere Ltd | Professional & scientific | 2014 |
| Bizwizuk Limited | Administrative & support | 2011 |
| Bizyco Ltd | Wholesale & retail | 2025 |
| Bizz Serve Ltd | Wholesale & retail | 2025 |
| Bizzbox Limited | Information & communication | 2025 |
| Bizzco Ltd | Wholesale & retail | 2025 |
| Bizzideas Limited | Wholesale & retail | 2019 |
| Bizzie Kidz Limited | Professional & scientific | 2001 |
| Bizzy Enterprizez Limited | Wholesale & retail | 2025 |
| BJ Electrical & Building Works Ltd | Construction | 2025 |
| BJ Manchester Ltd | Wholesale & retail | 2025 |
| BJ Software Limited | Information & communication | 2005 |
| Bjaa Accounts LLP | | 2022 |
| Bjaa Business Services LLP | | 2022 |
| Bjaa Client LLP | | 2022 |
| Bjaa Consultancy LLP | | 2022 |
| Bjaa Payroll LLP | | 2022 |
| Bjdt Holdings | Professional & scientific | 2026 |
| BJH Living Ltd | Households | 2025 |
| BJL Flooring Solutions Ltd | Construction | 2025 |
| BJQ Limited | Information & communication | 2018 |
| BJS Improve Ltd | Administrative & support | 2020 |
| BJS Inspiration Ltd | Administrative & support | 2022 |
| Bjscivils Limited | Construction | 2018 |
| BJW Projects Ltd | Construction | 2025 |
| BJZ Services Limited | Water & waste | 2019 |
| BK Anaesthesia Limited | Health & social care | 2023 |
| BK Aspire Ltd | Professional & scientific | 2025 |
| BK Boxing Limited | Other services | 2024 |
| BK Castlefield Ltd | Real estate | 2026 |
| BK Comms Limited | Construction | 2016 |
| BK Corporations Ltd | Financial services | 2023 |
| BK Engineering and Installations Limited | Construction | 2016 |
| BK Global Ltd | Transport & logistics | 2017 |
| BK Karahi Ltd | Hospitality | 2025 |
| BK KR3 Ltd | Real estate | 2025 |
| BK Marketing Services Ltd | Professional & scientific | 2022 |
| BK Traders Burnley Limited | Construction | 2019 |
| BKC Superstore Limited | Wholesale & retail | 2025 |
| BKD Developments Ltd | Real estate | 2023 |
| BKD Global Traders Ltd | Wholesale & retail | 2025 |
| Bkdanish Lustre & Lore Ltd | Manufacturing | 2025 |
| BKE Estates Limited | Construction | 2026 |
| BKL Industries Ltd | Wholesale & retail | 2017 |
| BKM Catering Services Ltd | Hospitality | 2022 |
| BKM Nails and Spa Limited | Other services | 2024 |
| Bksl Limited | Wholesale & retail | 2006 |
| BKW Group Limited | Financial services | 2020 |
| BKW Instruments Limited | Manufacturing | 1975 |
| BL Building & Contractors Limited | Construction | 2024 |
| BL Care Solutions Ltd | Health & social care | 2023 |
| BL Real Estate Ltd | Real estate | 2021 |
| BL Skincare Ltd | Wholesale & retail | 2026 |
| BL08 LLP | | 2008 |
| BL1SS Ltd | Extraterritorial | 2020 |
| BL5 School Uniforms & Workwear Ltd | Wholesale & retail | 2024 |
| BLA Logistics Ltd | Transport & logistics | 2016 |
| Blabbermouth Marketing Limited | Professional & scientific | 2011 |
| Blablablunt Ltd | Wholesale & retail | 2018 |
| Black & Gold Financial Services Limited | Financial services | 2017 |
| Black & White Consultancy Limited | Administrative & support | 2024 |
| Black & White Holdings Ltd | Professional & scientific | 2024 |
| Black & White Properties Ltd | Real estate | 2024 |
| Black & White Properties Two Ltd | Real estate | 2024 |
| Black Apple Property Holdings Ltd | Real estate | 2026 |
| Black Beautique Ltd | Wholesale & retail | 2020 |
| Black Billionaire Club Limited | Wholesale & retail | 2025 |
| Black Bird Transport Limited | Wholesale & retail | 2023 |
| Black Blob Limited | Construction | 2019 |
| Black Box Research Ltd | Information & communication | 2022 |
| Black Box Sounds Ltd | Information & communication | 2021 |
| Black Box Ventures Ltd | Financial services | 2025 |
| Black Britain Ltd | Wholesale & retail | 2020 |
| Black Bull Biochar Ltd | Information & communication | 2021 |
| Black Bull Biochar Radcliffe Ltd | Professional & scientific | 2025 |
| Black Bull Fencing Limited | Manufacturing | 2014 |
| Black Burger Ltd | Hospitality | 2022 |
| Black CAB Centre Limited | Wholesale & retail | 2012 |
| Black Cat Art Ltd | Wholesale & retail | 2023 |
| Black Cat Building Consultancy Limited | Professional & scientific | 2015 |
| Black Cat Distribution Limited | Transport & logistics | 2021 |
| Black Cat Marketing Ltd | Professional & scientific | 2024 |
| Black Chair Rental Ltd | Other services | 2018 |
| Black Creative Trailblazers CIC | Arts & recreation | 2024 |
| Black Diamonds International Ltd | Administrative & support | 2024 |