| Backhouse Properties Group Ltd | Real estate | 2014 |
| BAK Logistics Ltd | Transport & logistics | 2026 |
| Baluco Ltd | Construction | 2021 |
| Bandbrand Holdings Ltd | Financial services | 2024 |
| Bandbrand Limited | Construction | 2001 |
| Bandshare Limited | Information & communication | 2024 |
| Bangor Hotels Limited | Extraterritorial | 2015 |
| Barbon Fire Protection Limited | Public administration | 2025 |
| Barings Property Company Ltd | Wholesale & retail | 2024 |
| Barker Industrial Services Limited | Manufacturing | 2017 |
| Baron Kelso Corporate Trustee Ltd | Financial services | 2022 |
| Barringtons Property Limited | Real estate | 2015 |
| Bateshaws Removals & Storage Ltd | Transport & logistics | 2019 |
| Baypride Developments Limited | Real estate | 2006 |
| BB Maintenance Solutions Ltd | Construction | 2015 |
| Bbsc Limited | Construction | 2009 |
| BC Jewellers Limited | Wholesale & retail | 2024 |
| BC Paving & Groundworks Ltd | Administrative & support | 2024 |
| BCM Secure Storage Ltd | Water & waste | 2011 |
| BDD Web Limited | Real estate | 2025 |
| BE the Best YOU CAN Ltd | Health & social care | 2021 |
| Bearded Dragon Rescue Limited | Wholesale & retail | 2026 |
| Bearweld Limited | Professional & scientific | 2017 |
| Bebb Electrical Limited | Construction | 2019 |
| BEE Coaching Ltd | Other services | 2020 |
| Beechwood Farm Day Nursery Limited | Health & social care | 2005 |
| Belaluchli Limited | Construction | 2019 |
| Belle and Co Hair Limited | Other services | 2026 |
| Bellings Limited | Wholesale & retail | 2025 |
| Bellmax Construction Ltd | Construction | 2020 |
| Bellmax Developments Limited | Construction | 2013 |
| Bengal RAJ Limited | Hospitality | 2025 |
| Benisor Sandu Ltd | Transport & logistics | 2026 |
| Bennett Holdings Group Ltd | Financial services | 2026 |
| Benshi Engineering Ltd | Construction | 2025 |
| Bensons Products Limited | Manufacturing | 2008 |
| Bespoke Funding Solutions Limited | Financial services | 2018 |
| Bespoke PSP Group Limited | Financial services | 2021 |
| Best CUT Barber Widnes Ltd | Other services | 2024 |
| Bevander Transport Limited | Transport & logistics | 2013 |
| BH Financial Services Ltd | Financial services | 2015 |
| BIA Move Ltd | Transport & logistics | 2021 |
| BIB Growth Ltd | Professional & scientific | 2025 |
| Big Dog Walker Widnes Ltd | Other services | 2021 |
| Bigarnie Ltd | Information & communication | 2021 |
| Billington Properties Limited | Real estate | 2024 |
| Birchfield Marketing Limited | Wholesale & retail | 2025 |
| Birchfield Park Sports and Social Club Limited | Hospitality | 1998 |
| Birchfield Sports Limited | Arts & recreation | 2009 |
| Birchtree Mortgages Ltd | Financial services | 2024 |
| Bisita Travel Limited | Administrative & support | 2024 |
| Bisous Bath Luxuries Ltd | Manufacturing | 2023 |
| BJE Instrumentation Limited | Construction | 2013 |
| Black Door Associates Ltd | Administrative & support | 2022 |
| Black Font Design Limited | Professional & scientific | 2021 |
| Black White Investments UK Ltd | Real estate | 2017 |
| Blackman & Blackman Consultancy Ltd | Administrative & support | 2015 |
| Blackpool Smile Centre Ltd | Health & social care | 2026 |
| Blackstock Street Limited | Construction | 2018 |
| Blakely Property Ltd | Real estate | 2026 |
| Bloodstream Radio Ltd | Information & communication | 2025 |
| Blooms of Cheshire Ltd | Administrative & support | 2024 |
| Blossom Beauty & Cosmetic Clinic Ltd | Other services | 2019 |
| Blue Arrow Trans Ltd | Transport & logistics | 2020 |
| Blue Circle Property Group Ltd | Real estate | 2025 |
| Blue Light Investigations & Training Limited | Administrative & support | 2013 |
| Blue Sky (Liverpool) Ltd | Hospitality | 2025 |
| Bluebell Commercials Ltd | Professional & scientific | 2025 |
| Bluebell Landscapes Ltd | Administrative & support | 2022 |
| Bluejay Accounting Ltd | Professional & scientific | 2025 |
| Blueshield Heating Care Ltd | Other services | 2009 |
| BMF Container Monkeys Ltd | Professional & scientific | 2023 |
| BMH Storage Limited | Professional & scientific | 2015 |
| BMJ Project Planning Ltd | Administrative & support | 2011 |
| BMR Services Ltd | Construction | 2020 |
| BMS Developments Limited | Construction | 2018 |
| BNB Engineering Ltd | Construction | 2025 |
| BNL Cleaning Services Ltd | Administrative & support | 2024 |
| BNW Properties Limited | Wholesale & retail | 2019 |
| BNW Trading Limited | Real estate | 2022 |
| Boardman Pubs Ltd | Hospitality | 2019 |
| Boat House Inns Limited | Hospitality | 2012 |
| Body Art & Tattoo Ltd | Arts & recreation | 2023 |
| Bogdy Ltd | Transport & logistics | 2018 |
| Bold Street Car Dismantlers Limited | Wholesale & retail | 2016 |
| Bona Fide Business Ltd | Hospitality | 2019 |
| Bona Fide Estates Ltd | Real estate | 2023 |
| Bona Fide Management Ltd | Real estate | 2020 |
| Bona Fide Properties Ltd | Real estate | 2025 |
| Bootle Containers Limited | Manufacturing | 1977 |
| Borlase Digital Engineering Ltd | Professional & scientific | 2026 |
| Borough Cabs Limited | Other services | 2018 |
| Boss Safety Services Limited | Other services | 2006 |
| Bowen Asset Management Ltd | Real estate | 2016 |
| Bowen Lettings Ltd | Real estate | 2023 |
| Bowen Mortgages Ltd | Financial services | 2024 |
| BP Spedition Ltd | Transport & logistics | 2022 |
| BRA Trans Limited | Transport & logistics | 2023 |
| Bracken Golf Ltd | Manufacturing | 2025 |
| Bradwell Consulting Limited | Information & communication | 2005 |