| Brackenreed Limited | Extraterritorial | 2026 |
| Brackenwood Crag LLP | | 2025 |
| Brackenwood Property Ltd | Real estate | 2023 |
| Bradford City Limited | Extraterritorial | 2011 |
| Bradford Family Holdings Ltd | Real estate | 2017 |
| Bradley Business Solutions Limited | Real estate | 2003 |
| Bradley-Mason LLP | | 2006 |
| Bradstone Consulting Ltd | Professional & scientific | 2023 |
| Brainwave Business Setup Ltd | Wholesale & retail | 2024 |
| Braithwaite Finance Limited | Financial services | 1983 |
| Brake Horsepower Ltd | Extraterritorial | 2012 |
| Bramall & Ogden Limited | Construction | 1969 |
| Bramall Farming Limited | Agriculture & fishing | 2014 |
| Bramall Hull Limited | Real estate | 2022 |
| Bramall Properties Limited | Real estate | 1990 |
| Brambleside Risk Management LLP | | 2008 |
| Bramham Lodge Residents Company Limited | Households | 2018 |
| Bramhope Property and Investments Limited | Real estate | 2012 |
| Branching OUT Media Ltd | Information & communication | 2011 |
| Brand Activists Limited | Information & communication | 2002 |
| Brand Beacon Ltd | Professional & scientific | 2019 |
| Brand Distillery Consulting Limited | Professional & scientific | 2017 |
| Brand Royalty Limited | Professional & scientific | 2017 |
| Brandactif Limited | Information & communication | 2013 |
| Brandon Hire Group Holdings Limited | Extraterritorial | 2010 |
| Brandon Hire Group Limited | Extraterritorial | 2010 |
| Brandon Hire Limited | Extraterritorial | 1971 |
| Brandon Webster Limited | Extraterritorial | 2021 |
| Brandstrom Design Ltd | Professional & scientific | 2009 |
| Brantwood House Management Company Limited | Households | 2002 |
| Bravo Investment Holdings 2 Limited | Financial services | 2016 |
| Bravo Investment Holdings 3 Limited | Financial services | 2016 |
| Bravo Investment Holdings Limited | Financial services | 2016 |
| Braymarsh Limited | Professional & scientific | 1988 |
| Breakoutblock Ltd | Wholesale & retail | 2024 |
| Brearton Properties Limited | Real estate | 2024 |
| Brennan Enterprise Holdings Limited | Real estate | 2020 |
| Brentwood Plumbing & Heating Limited | Other services | 2014 |
| Bretton Investment Partnership Limited | Real estate | 2007 |
| Brevix for Trade Ltd | Wholesale & retail | 2021 |
| Brewery Wharf (Leeds) Limited | Real estate | 1998 |
| Brewins Family Investment Company Limited | Financial services | 2023 |
| Brewster Utilities Limited | Extraterritorial | 2025 |
| BREX1T Limited | Extraterritorial | 2020 |
| Brian Charlton Design Ltd | Professional & scientific | 2016 |
| Brian Goddard Construction Limited | Construction | 2025 |
| Brick Corp Limited | Extraterritorial | 2018 |
| Bricktop Developments Ltd. | Wholesale & retail | 1999 |
| Bridestone Properties Limited | Extraterritorial | 2006 |
| Bridge Go Limited | Wholesale & retail | 2024 |
| Bridge Mechanical Services Ltd | Construction | 2013 |
| Bridgehouse Developments Limited | Real estate | 2013 |
| Bridgeside Garage Limited | Wholesale & retail | 2009 |
| Brierley Real Estate Limited | Real estate | 2020 |
| Briggate Management Company Limited | Households | 2001 |
| Briggs Giliker Consulting Limited | Professional & scientific | 2008 |
| Bright Alliance Limited | Professional & scientific | 2024 |
| Bright Circular Services Limited | Wholesale & retail | 2025 |
| Bright Future for Trading and Contracting Ltd | Wholesale & retail | 2024 |
| Bright Solutions Group Ltd | Professional & scientific | 2024 |
| Bright Sparks LAB Ltd | Information & communication | 2026 |
| Brightarc Medical Limited | Professional & scientific | 2025 |
| Brighter Futures Publishing Ltd | Information & communication | 2021 |
| Brightside Spirits Limited | Wholesale & retail | 2026 |
| Brimhams Active Limited | Other services | 2020 |
| Brinks MAT Ltd | Wholesale & retail | 2024 |
| Briodux Limited | Manufacturing | 2014 |
| Briscoe Ridge Properties Ltd | Real estate | 2026 |
| Brit POP Ltd | Extraterritorial | 2012 |
| Britannic Capital Limited | Financial services | 2019 |
| Britannic Holdings Corporation Limited | Professional & scientific | 2016 |
| Britannic Investment Management Limited | Financial services | 2019 |
| Britannic Land Co. Limited | Construction | 2024 |
| Britannic Lifts Ltd | Manufacturing | 2019 |
| British Christmas Tree Growers Association | Other services | 2020 |
| Brittanniacourt Leisure (Harrogate) Limited | Hospitality | 1990 |
| Broadcast.Bet Limited | Professional & scientific | 2018 |
| Broadley & Hazell Limited | Construction | 1987 |
| Broadley Commercial Ltd | Real estate | 2023 |
| Broco Gifts Ltd | Wholesale & retail | 2024 |
| Brodie Equity Limited | Financial services | 2025 |
| Broker Network (MGA) Limited | Financial services | 2016 |
| Broker Network Holdings Limited | Professional & scientific | 2004 |
| Brontemere Limited | Real estate | 2021 |
| Brontë Recruitment Group Ltd | Administrative & support | 2022 |
| Brood Coffee House Ltd | Hospitality | 2024 |
| Brook Company Holdings Ltd | Financial services | 2025 |
| Brooke Lawson Limited | Extraterritorial | 2021 |
| Brooke-Saggers Limited | Construction | 2011 |
| Brookfield Apartments Property Management Company Limited | Real estate | 2010 |
| Brookfields Park Limited | Real estate | 2025 |
| Brooks Electrical Contractors Limited | Construction | 2001 |
| Brown Bank (Farmers) Limited | Agriculture & fishing | 1978 |
| Brownes Bookkeeping & Accountancy Ltd | Professional & scientific | 2024 |
| Brownings Trustees Limited | Administrative & support | 2022 |
| Brownlee Cale Limited | Information & communication | 2012 |
| Broxholme Management (Ripley) Limited | Real estate | 1999 |
| Brp&Jm Holdings Ltd | Financial services | 2026 |
| Bruce Groups for Trade Ltd | Wholesale & retail | 2022 |
| Bruce Peak Limited | Professional & scientific | 2016 |