| Bosworth Grange Management Company Limited | Households | 2020 |
| Bosworth Manor Ltd | Real estate | 2024 |
| Botak Properties Limited | Real estate | 2024 |
| Bottles Worcester Ltd | Hospitality | 2014 |
| Bought.At Limited | Extraterritorial | 2014 |
| Boughton Butler Limited | Professional & scientific | 2019 |
| Boughton Park Limited | Arts & recreation | 2019 |
| Boughton Technical Media Ltd | Information & communication | 2021 |
| Boulton Limited | Construction | 2019 |
| Bounty Pictures Ltd | Information & communication | 2018 |
| Bourne Apps Ltd | Information & communication | 2020 |
| Bourne Edge (NO 3) Management Company Limited | Real estate | 1991 |
| Bourne Edge (NO.4) Management Company Limited | Households | 1992 |
| Bourne Taylor Limited | Other services | 2014 |
| Bourne Training Services Ltd | Education | 2023 |
| Bouvardia Trading Ltd | Wholesale & retail | 2024 |
| BOW TIE GTM Ltd | Information & communication | 2024 |
| Bowditch and Cole Landscapes Limited | Administrative & support | 2024 |
| Bower House (Henley) Management Company Limited | Households | 2025 |
| Bower Park Management Company Limited | Households | 2025 |
| Bowkett Auto Consulting Ltd | Information & communication | 2015 |
| Bowkett Media Ltd | Professional & scientific | 2025 |
| Box Fitness Limited | Arts & recreation | 2008 |
| Boxcar Event Productions Limited | Administrative & support | 2015 |
| Boxer Cleaning Services Limited | Arts & recreation | 1999 |
| Boyes Renovations Limited | Construction | 2023 |
| BOZ Limited | Administrative & support | 2025 |
| BPF (AV) Ltd | Wholesale & retail | 2004 |
| Bradford's Clinics UK Limited | Professional & scientific | 2017 |
| Bradshawgrey Ltd | Professional & scientific | 2019 |
| Braemar Frankland Accountancy Limited | Professional & scientific | 2016 |
| Braemar Frankland Limited | Professional & scientific | 2018 |
| Braeshall Ltd | Professional & scientific | 2012 |
| Braid Foods (Holdings) Limited | Wholesale & retail | 2008 |
| Brambles Glamping Limited | Hospitality | 2024 |
| Brand 29 Limited | Information & communication | 2009 |
| Brandless Limited | Information & communication | 2007 |
| Bransford Court Farm LLP | | 2011 |
| Bransford Estates Ltd | Real estate | 2019 |
| Bransford Garden Plants Limited | Agriculture & fishing | 1961 |
| Bransford Holdings Limited | Professional & scientific | 1991 |
| Bransford Properties Limited | Real estate | 2010 |
| Brasov Superstore Ltd | Wholesale & retail | 2022 |
| Brass Group Limited | Manufacturing | 1998 |
| Bravo! Home Improvements Ltd | Administrative & support | 2024 |
| BRB Systems Limited | Extraterritorial | 2025 |
| Breaking Bands Ltd | Arts & recreation | 2018 |
| Bredon Advisory Limited | Professional & scientific | 2014 |
| Brennan & Associates Limited | Professional & scientific | 2010 |
| Brennan Design Services Ltd | Professional & scientific | 2023 |
| Brewery Inns Ltd | Hospitality | 1992 |
| Brewster Inns Limited | Hospitality | 2014 |
| Brick & Branch Landscaping Ltd | Administrative & support | 2025 |
| Brickdraw Limited | Wholesale & retail | 2026 |
| Bridge Motor Group Ltd | Wholesale & retail | 2017 |
| Bridge School Malvern Ltd | Education | 2007 |
| Bridgeland Management Limited | Professional & scientific | 1990 |
| Bridginggaps Construction Solutions Limited | Construction | 2018 |
| Briela Ltd | Administrative & support | 2020 |
| Brigade Limited | Construction | 2021 |
| Briggs Tanner Builders Limited | Construction | 2016 |
| Bright Future Energy Group Ltd | Extraterritorial | 2022 |
| Bright Light Developments Limited | Construction | 2016 |
| Bright Mind International Ltd | Administrative & support | 2023 |
| Bright Vision Financial Planning Ltd | Financial services | 2017 |
| Brightwell Systems Limited | Manufacturing | 2007 |
| Brill Construction Safety Ltd | Professional & scientific | 2025 |
| Bringitinhouse Limited | Administrative & support | 2021 |
| Brinkley Enterprises Limited | Hospitality | 2010 |
| Brisket Brothers Ltd | Hospitality | 2022 |
| Bristol Accident Repair Centre Central Limited | Wholesale & retail | 2015 |
| Bristol Accident Repair Centre Limited | Wholesale & retail | 2007 |
| Bristol Hotspring Limited | Wholesale & retail | 2009 |
| Bristol Road DRY Cleaners Ltd | Other services | 2014 |
| Britalia Homes Limited | Real estate | 2022 |
| Britalia Investments Limited | Real estate | 2022 |
| Britannia Dynamic Logistics Limited | Transport & logistics | 2020 |
| Britannia Gardens Management Company Limited | Households | 2024 |
| Britannia Tyres Limited | Real estate | 1993 |
| Britannic Place Estate Planning Limited | Real estate | 2017 |
| Britannic Place Financial Management Limited | Financial services | 2006 |
| Britannic Place Holdings Limited | Financial services | 2021 |
| Brite Recruitment Ltd | Administrative & support | 2006 |
| Britindia Foods Ltd | Hospitality | 2024 |
| Britindia Tech Ltd | Information & communication | 2024 |
| British School of Madagascar (UK) Ltd | Wholesale & retail | 2016 |
| British Security Industry Association Limited(The) | Other services | 1967 |
| Brmb Radio Ltd. | Information & communication | 2023 |
| Broad Hill Ltd | Real estate | 2021 |
| Broad Quality Systems Ltd | Construction | 2017 |
| Broadenelm Limited | Households | 1997 |
| Broadheath Construction Limited | Construction | 2011 |
| Broadheath Day Nursery Limited | Extraterritorial | 2020 |
| Broadheath Forge Ltd | Manufacturing | 2025 |
| Broadhouse Holdings Ltd | Financial services | 2022 |
| Broadhouse Lettings Ltd | Real estate | 2024 |
| Broadwas Construction Services Limited | Construction | 2010 |
| Broadway Express Limited | Wholesale & retail | 2012 |
| Broadway Healthcare Logistics Ltd | Transport & logistics | 2023 |
| Bromsgrove Car Sales Ltd | Wholesale & retail | 2025 |