| BDM Bella Design and Marketing Limited | Professional & scientific | 2005 |
| BDP Construction Limited | Construction | 2021 |
| Beaconplus Ltd. | Professional & scientific | 1996 |
| Beat Productions CIC | Arts & recreation | 2022 |
| Beaumont Metro Ltd | Hospitality | 2008 |
| Beauty Nails MCR Limited | Other services | 2025 |
| Bebetter Limited | Wholesale & retail | 2005 |
| Beechwood Industries Limited | Administrative & support | 2007 |
| Beechwood Properties (NW) Limited | Real estate | 2024 |
| Bellefield LLP | | 2016 |
| Bellham Building Services Ltd | Construction | 2011 |
| Beluga Homes (Willaston) Ltd | Construction | 2014 |
| Benjica Developments Limited | Professional & scientific | 2021 |
| Benjica Limited | Real estate | 2019 |
| Bennett & Fountain Limited | Professional & scientific | 1962 |
| Bennett Consulting Services Ltd | Professional & scientific | 2019 |
| Bentley Design Developments Limited | Real estate | 2025 |
| Bentley Design Holdings Limited | Financial services | 2025 |
| Berkeley Square (Worthing) Freeholders Limited | Real estate | 2004 |
| Berkeley Square (Worthing) Residents Association Limited | Households | 1966 |
| Berrix Design Ltd | Professional & scientific | 2020 |
| Berwell Ltd | Administrative & support | 2013 |
| Bespoke Chiropractic Ltd | Health & social care | 2018 |
| Bespoke Plot Finder Limited | Construction | 2016 |
| Best Administration Services Ltd | Administrative & support | 2016 |
| Best Distribution Services Ltd | Administrative & support | 2016 |
| Best International Group Ltd | Professional & scientific | 2011 |
| Best Trustee Services Ltd | Professional & scientific | 2014 |
| Besttreads Limited | Wholesale & retail | 2010 |
| Better Hypnotherapy Ltd | Health & social care | 2025 |
| Bexton Consulting Ltd | Professional & scientific | 2024 |
| Bexton Property (Commercial) Limited | Real estate | 2023 |
| Bexton Property Limited | Real estate | 2022 |
| Beyond Leadership Coaching Ltd | Professional & scientific | 2024 |
| Beyond Wealth (Financial Management) Limited | Financial services | 2023 |
| Bfbuk Ltd | Wholesale & retail | 2023 |
| BFC Group Ltd | Wholesale & retail | 2023 |
| BI Investments Limited | Real estate | 1996 |
| Bianca Morgan Architects Limited | Professional & scientific | 2020 |
| Bijou U.K. Imports Limited | Wholesale & retail | 1991 |
| Bijou Vintners Limited | Real estate | 1998 |
| Bikes 'N' Gear Limited | Wholesale & retail | 2012 |
| Bill of QTY Ltd | Professional & scientific | 2025 |
| Binary Star Digital Limited | Financial services | 2025 |
| Birkin Service Centre Limited | Wholesale & retail | 1999 |
| Birth, Growth and Healing Limited | Health & social care | 2013 |
| Birtwistle Properties Ltd | Financial services | 2018 |
| Bitter Twisted Bars and Restaurants Limited | Wholesale & retail | 2016 |
| Bitter Twisted Drinks Distribution Limited | Wholesale & retail | 2016 |
| Bitter Twisted Limited | Hospitality | 2012 |
| Black Dog Wine Agency Limited | Wholesale & retail | 2011 |
| Black OWL Property Ltd | Households | 2019 |
| Blackframe.Ai Ltd | Information & communication | 2024 |
| Blackheath Travel Limited | Administrative & support | 1965 |
| Blackhill Barns Management Company Limited | Households | 2013 |
| Blade & Grain Ltd | Other services | 2026 |
| Blakes Wood Management Company Limited | Households | 2001 |
| Blake’S Landscapes Limited | Administrative & support | 2025 |
| BLB Partnership Ltd | Real estate | 2017 |
| Bliss Aesthetics Ltd | Other services | 2017 |
| Blockbeam Ltd | Professional & scientific | 2025 |
| Bloometrics Limited | Administrative & support | 2017 |
| BLU Moss Estates Ltd | Real estate | 2008 |
| Blue & Yellow Consulting Ltd | Professional & scientific | 2026 |
| Blue 2 Limited | Professional & scientific | 2008 |
| Blue Cloud Construction and Renovation Limited | Construction | 2016 |
| Blue Duck Limited | Information & communication | 2007 |
| Blue Heeler Limited | Professional & scientific | 2015 |
| Blue Remedy MCR Ltd | Wholesale & retail | 2019 |
| Blue River Life Sciences Ltd | Extraterritorial | 2024 |
| Blue Skies Programme Management Limited | Extraterritorial | 2014 |
| Bluebell Property Rentals Limited | Real estate | 2024 |
| Blueberry Homes Interiors Limited | Construction | 2010 |
| Bluelight Consultancy Limited | Education | 2011 |
| Bluestone 1970 Ltd | Professional & scientific | 2025 |
| BN Clock Repair Limited | Other services | 2025 |
| Board Ventures Limited | Professional & scientific | 2026 |
| Boardman Properties Limited | Real estate | 2013 |
| BOB Farnon (Tyres) Limited | Wholesale & retail | 1972 |
| BOB Hanley Ltd | Arts & recreation | 2023 |
| BOI Holdings Limited | Wholesale & retail | 2016 |
| BOI Trading Company Limited | Wholesale & retail | 1994 |
| Bolland Real Estate Limited | Real estate | 2024 |
| Bollingate Properties Limited | Real estate | 2025 |
| Bollington Storage Company Limited | Administrative & support | 1970 |
| Bone Remediation Consulting Limited | Professional & scientific | 2020 |
| Boomerang Hype Ltd | Professional & scientific | 2023 |
| Boundary Park Management Company Limited | Households | 2005 |
| Boutique 50 FM Ltd | Real estate | 2022 |
| Box Beauty LLP | | 2008 |
| Boyfromblighty UK Ltd | Wholesale & retail | 2017 |
| Boyzlife Touring Limited | Arts & recreation | 2016 |
| Bpok Investments Limited | Real estate | 2021 |
| BR Property Group Limited | Real estate | 2006 |
| Bradbys Limited | Information & communication | 2021 |
| Bradford Riding School Limited | Agriculture & fishing | 2016 |
| Braham Management Limited | Professional & scientific | 1998 |
| Bramley Maintenance Ltd | Other services | 2024 |
| Brand Corner Limited | Wholesale & retail | 2026 |
| Brandhaus IP Limited | Financial services | 2022 |