| British Gliding Association Limited | Arts & recreation | 1946 |
| British Hang Gliding & Paragliding Association Limited | Other services | 1991 |
| British Indo UK Ltd | Agriculture & fishing | 2024 |
| British Motorcyclists Federation (Enterprises)Limited(The) | Other services | 1970 |
| British Parachute Association Limited | Other services | 1966 |
| British Precast Concrete Federation Limited(The) | Other services | 1975 |
| British Skydiving Limited | Other services | 2020 |
| Britken Limited | Transport & logistics | 2019 |
| Britken Properties Ltd | Real estate | 2012 |
| Brits Desi Soci CIC | Health & social care | 2024 |
| Brittannia Holdings (UK) Limited | Real estate | 2009 |
| Brittannia Investments Limited | Real estate | 2014 |
| Brittannia Properties Ltd | Real estate | 2024 |
| Brittannia Textile Printers (Leicester) Limited | Manufacturing | 1987 |
| Britten Engineering Limited | Manufacturing | 1986 |
| Brittradeexpo Ltd | Wholesale & retail | 2025 |
| Britup Brand & Skills Limited | Professional & scientific | 2026 |
| Britwear Enterprise Limited | Wholesale & retail | 2011 |
| Britwheels Ltd | Wholesale & retail | 2025 |
| Britwin Ltd | Wholesale & retail | 2016 |
| Britwin Properties Ltd | Real estate | 2018 |
| Britz Food Corp Ltd | Professional & scientific | 2025 |
| Brivailance Limited | Health & social care | 2016 |
| Brixham Insights Ltd | Hospitality | 2016 |
| Brixo Group Ltd | Real estate | 2025 |
| BRK Consultants Limited | Professional & scientific | 2020 |
| BRK Traders Limited | Wholesale & retail | 2022 |
| BRO Services Limited | Wholesale & retail | 2023 |
| Broad & Co. Wealth Management Limited | Financial services | 2014 |
| Broadacre House Ltd | Financial services | 2025 |
| Broadbase Limited | Wholesale & retail | 2024 |
| Broadbent's County Estates Limited | Real estate | 2000 |
| Broader Horizons Ltd | Other services | 2024 |
| Broadleaf Investments Limited | Real estate | 2025 |
| Broadpark Developments Ltd | Real estate | 2017 |
| Broadview Recruitment Limited | Administrative & support | 2025 |
| Broadway Construction Limited | Construction | 2011 |
| Broadway Express Leicester Ltd | Extraterritorial | 2024 |
| Broadway Healthcare Limited | Real estate | 2006 |
| Broadway Investment Holdings Limited | Real estate | 2022 |
| Broadway Property Group Ltd | Construction | 2017 |
| Broadwood Rose Ltd | Wholesale & retail | 2025 |
| Broadyard Associates Limited | Real estate | 1991 |
| Broche Boutique Ltd | Wholesale & retail | 2021 |
| Brockenhurst Unity Ltd | Transport & logistics | 2014 |
| Broderick Mining and Metals Limited | Manufacturing | 2013 |
| Brogan Group Investments Ltd | Professional & scientific | 2015 |
| Broja Clips Ltd | Information & communication | 2025 |
| Brokerbility Holdings Limited | Financial services | 2009 |
| Brokerbility Information Gateway Limited | Financial services | 2007 |
| Brokerbility Limited | Financial services | 2004 |
| Brokertech Ltd | Information & communication | 2008 |
| Brolay Care Farm Ltd | Education | 2012 |
| Bromfield Manufacturing Limited | Manufacturing | 2025 |
| Bromford Acquisitions Limited | Professional & scientific | 2016 |
| Bromford Holdings Limited | Professional & scientific | 2009 |
| Bromford Precision Solutions Limited | Manufacturing | 2022 |
| Bromley Enterprises (U.K.) Limited | Manufacturing | 1984 |
| Bromstar Limited | Financial services | 2015 |
| Bronavon Investments Limited | Real estate | 2022 |
| Bronsons Hybrid Performance Limited | Health & social care | 2026 |
| Brook Properties (Brook Centre a) Limited | Real estate | 2026 |
| Brook Properties (Edwalton) Limited | Real estate | 2025 |
| Brook Property Holdings Limited | Real estate | 2026 |
| Brooke Church Development Limited | Construction | 2019 |
| Brooke Church Limited | Real estate | 2016 |
| Brooke House College Iraq Limited | Education | 2019 |
| Brooke Lodge Limited | Education | 2020 |
| Brooke Street Boozers Ltd | Hospitality | 2025 |
| Brooker Developments Limited | Construction | 2021 |
| Brooker Holdings Limited | Financial services | 2021 |
| Brookfield House Breaks Ltd | Hospitality | 2024 |
| Brookgreen Logistics Ltd | Transport & logistics | 2014 |
| Brooklands Consultants Limited | Professional & scientific | 2015 |
| Brooklands Fund Raising Services Limited | Professional & scientific | 2003 |
| Brookleigh Grounds Maintenance Ltd | Administrative & support | 2015 |
| Brooks & Co (Blaby) Limited | Professional & scientific | 2012 |
| Brooks & Co Holding Limited | Financial services | 2016 |
| Brooks & Sharpe Ltd | Wholesale & retail | 2015 |
| Brooks Edge Holdings Limited | Financial services | 1963 |
| Brooks Equestrian Academy Limited | Education | 2022 |
| Brooks Investment Properties Ltd | Real estate | 2023 |
| Brooks Software Solutions Ltd | Information & communication | 2026 |
| Brooks&Grant Limited | Manufacturing | 2021 |
| Brookside (2014) Limited | Construction | 2014 |
| Brookside Construction (Leicester) Limited | Construction | 1998 |
| Brookside Syston Management Company Limited | Households | 2005 |
| Brooksie Limited | Construction | 2022 |
| Brookson (5332P) Limited | Administrative & support | 2007 |
| Brookson (5972E) Limited | Information & communication | 2007 |
| Brookstone Lettings Ltd | Real estate | 2024 |
| Brooksure Limited | Financial services | 2005 |
| Brookvale Groby Learning Trust | Education | 2012 |
| Brookvale Pharmacy Limited | Wholesale & retail | 1997 |
| Brookview Dental Clinic Limited | Health & social care | 2008 |
| Brookwood Ability Ltd | Health & social care | 2014 |
| Broomfield Gates and Bespoke Joinery Limited | Manufacturing | 2020 |
| Broomhall Leighterton Management Company Limited | Real estate | 2026 |
| Brorie Manor Estates Ltd | Hospitality | 2024 |
| Bros Slice & Grill Ltd | Hospitality | 2025 |