| British Business Financial Services Ltd | Financial services | 2014 |
| British Business Investments Ltd | Financial services | 2014 |
| British Essential OIL Association Limited(The) | Professional & scientific | 1978 |
| British Federation of Film Societies(The) | Education | 1978 |
| British Foundry Units Limited | | 1931 |
| British Healthcare Business Intelligence Association | Other services | 2014 |
| British Jaeger Instruments Limited | Extraterritorial | 2004 |
| British Para Table Tennis Limited | Arts & recreation | 2014 |
| British Patient Capital Limited | Financial services | 2018 |
| British Radiosurgery Society | Health & social care | 2008 |
| British Silverware Limited | Manufacturing | 2005 |
| British Society for Histocompatibility and Immunogenetics | Other services | 2007 |
| British Springs Limited | Extraterritorial | 1997 |
| British Stainless Steel Association | Other services | 2011 |
| Britlink Logistics Limited | Transport & logistics | 2025 |
| Brits Tech Ltd | Wholesale & retail | 2023 |
| Britwish Ltd | Wholesale & retail | 2021 |
| Brix Residential Limited | Real estate | 2017 |
| Brixton Pavilion Ltd | Real estate | 2005 |
| BRJ Solutions Ltd | Information & communication | 2012 |
| Brks Design & Build Ltd | Construction | 2025 |
| BRL Holdings Limited | Real estate | 2019 |
| Brmco (262) Limited | Extraterritorial | 2025 |
| Broad Elms Lane Freehold Limited | Households | 2021 |
| Broad Leaf Care Ltd | Health & social care | 2022 |
| Broad Yorkshire Law Limited | Professional & scientific | 2011 |
| Broadblast Limited | Manufacturing | 1981 |
| Broadcastle Properties Ltd | Real estate | 2023 |
| Broadfield Build Ltd | Construction | 2022 |
| Broadfield Business Centre Limited | Real estate | 2015 |
| Broadfield Construct Limited | Construction | 2018 |
| Broadfield Garden Machinery & Landscaping Ltd | Wholesale & retail | 2010 |
| Broadfield Holdings Limited | Construction | 1973 |
| Broadfield Industrial Installations Ltd | Professional & scientific | 2019 |
| Broadfield Mowers Limited | Wholesale & retail | 2009 |
| Broadfield Project Management Limited | Professional & scientific | 2005 |
| Broadfield Properties Limited | Extraterritorial | 2008 |
| Broadfield Signs Limited | Wholesale & retail | 2012 |
| Broadfields Park Limited | Construction | 1989 |
| Broadfray Limited | Information & communication | 2018 |
| Broadhead Holdings South Yorkshire Ltd | Financial services | 2025 |
| Broadhead Mind Performance Ltd | Health & social care | 2018 |
| Broadleaf Professional Ltd | Professional & scientific | 2022 |
| Broadnex Ltd | Wholesale & retail | 2024 |
| Broadset Solutions Ltd | Other services | 2026 |
| Broadstay Ltd | Real estate | 2024 |
| Broadstone Equestrian Limited | Agriculture & fishing | 2016 |
| Broadstone Stud Limited | Professional & scientific | 2013 |
| Broadsword Industries Ltd | Manufacturing | 2010 |
| Broadtrack Properties Limited | Real estate | 2024 |
| Broadview Management Services Limited | Professional & scientific | 2015 |
| Brocco Management Limited | Households | 1998 |
| Brocco Property Limited | Real estate | 2018 |
| Brock Media (Geography) Limited | Information & communication | 2024 |
| Brocklebank & Co. (Demolition) Limited | Transport & logistics | 1957 |
| Brockwell Partners Ltd | Administrative & support | 2025 |
| Broder Hoses Ltd. | Wholesale & retail | 2020 |
| Broder Metals Group Limited | Wholesale & retail | 2006 |
| Broder Powder Limited | Wholesale & retail | 2010 |
| Brodie's Window Cleaning Ltd | Administrative & support | 2021 |
| Broers Ltd | Wholesale & retail | 2020 |
| Broggin Ltd | Hospitality | 2020 |
| Broken Angel Ltd | Transport & logistics | 2025 |
| Brolly Property Group Ltd | Real estate | 2024 |
| Bromco Automotive Limited | Wholesale & retail | 2021 |
| Bromley Properties Yorkshire Limited | Real estate | 2025 |
| Bromsgrove Winding Services Limited | Manufacturing | 1996 |
| Bron-Yr-Aur Limited | Financial services | 2016 |
| Bronwen Whitaker Picture Framers Limited | Administrative & support | 2013 |
| Bronzd Ltd | Wholesale & retail | 2026 |
| Bronze AGE Creative Ltd | Professional & scientific | 2025 |
| Bronzegold Limited | Wholesale & retail | 2007 |
| Brook & Co Group Ltd | Financial services | 2026 |
| Brook Bakery Limited | Manufacturing | 2005 |
| Brook Bros. Limited | Professional & scientific | 1957 |
| Brook Consult Limited | Professional & scientific | 2008 |
| Brook ERP Ltd | Information & communication | 2026 |
| Brook Interiors Ltd | Construction | 2014 |
| Brook Lane (Wessington) Management Company Limited | Households | 2025 |
| Brook Lane Chapel Management Limited | Households | 2024 |
| Brook Meadows Management Company Limited | Households | 2006 |
| Brook View Health Care Limited | Health & social care | 2018 |
| Brookdale-Engineering Limited | Administrative & support | 2010 |
| Brooke Business Support Ltd | Administrative & support | 2022 |
| Brooke Care & Support Ltd | Health & social care | 2022 |
| Brooke Finishings Ltd | Construction | 2018 |
| Brooke House Yorkshire Limited | Construction | 1997 |
| Brookeport Capital Asset Management Limited | Real estate | 2016 |
| Brookeport Capital LLP | | 2016 |
| Brookeport Investments Limited | Real estate | 2014 |
| Brookes Engineers Limited | Professional & scientific | 1998 |
| Brookes Enterprise Limited | Hospitality | 2019 |
| Brookfield Garth Hampsthwaite Management Company Limited | Households | 2019 |
| Brookfield IE Ltd | Real estate | 2025 |
| Brookfields Park Management Company Limited | Real estate | 2005 |
| Brookfind Limited | Construction | 2024 |
| Brookhill Post Ltd | Transport & logistics | 2023 |
| Brookhouse GAS Service Care Ltd | Construction | 2011 |
| Brookhouse GAS Services Limited | Construction | 2003 |
| Brooklands (Middlewood) Management Limited | Households | 2001 |