| Brave Energy Saving Solutions Ltd | Other services | 2021 |
| Bravo Automobiles Limited | Wholesale & retail | 2025 |
| Brawl Boxing Ltd | Wholesale & retail | 2023 |
| Brayson Consulting Ltd | Administrative & support | 2022 |
| Braystones Automotive Ltd | Manufacturing | 2019 |
| Braystones Ltd | Other services | 2024 |
| Brazenlight Limited | Real estate | 1999 |
| Breading Sauces and Spices Ltd | Wholesale & retail | 2026 |
| Breadwin NCL Ltd | Hospitality | 2025 |
| Breakwater Property Ltd | Real estate | 2022 |
| Breamish Quays Freehold Company Limited | Real estate | 2022 |
| Breamish Quays RTM Company Limited | Households | 2021 |
| Breath-Tec Ltd | Health & social care | 2019 |
| Breathe Easy Service & Training Ltd | Manufacturing | 2011 |
| Breeze Creatives Community Interest Company | Arts & recreation | 2014 |
| Breeze Marine Ltd | Manufacturing | 2018 |
| Breezy Cleans Ltd | Administrative & support | 2025 |
| Brek-E Limited | Hospitality | 2023 |
| Bremner Ventures Ltd | Financial services | 2024 |
| Brentwood Avenue Ltd | Information & communication | 2024 |
| Brewery Lane Pharmacy Limited | Wholesale & retail | 2003 |
| Brewhouse Coffee Shops and Restaurants Limited | Hospitality | 2016 |
| Bria Organics Limited | Wholesale & retail | 2013 |
| Brian Aitken Associates Limited | Professional & scientific | 2015 |
| Brian Tinnion Ltd | Wholesale & retail | 2015 |
| Briar Fields Management Company Limited | Households | 2017 |
| Briarstone Property Solutions Ltd | Real estate | 2020 |
| Brick & IVY Limited | Real estate | 2026 |
| Brick Buy Brick Ltd | Real estate | 2022 |
| Brickez Ltd | Construction | 2025 |
| Brickline Northeast Ltd | Construction | 2025 |
| Bricks & Mortar Property Developments Ltd | Real estate | 2020 |
| Bricks and Mortar Beadnell Limited | Real estate | 2021 |
| Bricks in the BAG Limited | Wholesale & retail | 2025 |
| Bride on the Tyne Ltd | Other services | 2018 |
| Bridewell Direct Limited | Wholesale & retail | 1978 |
| Bridge & Co Private Finance Ltd | Professional & scientific | 2012 |
| Bridge + Tunnel Films Ltd | Arts & recreation | 2009 |
| Bridge + Tunnel Productions | Information & communication | 2003 |
| Bridge Court Holdings Limited | Construction | 1998 |
| Bridge Distribution Partners Limited | Administrative & support | 2011 |
| Bridge East Marketing Limited | Professional & scientific | 2025 |
| Bridge House (Elmwood) Limited | Health & social care | 2011 |
| Bridge Industrial Limited | Professional & scientific | 2007 |
| Bridge Quay Ltd | Construction | 2016 |
| Bridge the GAP Finance Ltd | Financial services | 2024 |
| Bridgepay Investments Limited | Real estate | 2023 |
| Bridgeway Interiors Ltd | Wholesale & retail | 2026 |
| Bridgstone Property Group Ltd | Real estate | 2025 |
| Bridgwater CEC Limited | Wholesale & retail | 2022 |
| Brierdene Automation Limited | Professional & scientific | 2024 |
| Brierley Green Management Company Limited | Households | 2012 |
| Brierley J Recruitment Ltd | Administrative & support | 2014 |
| Brierley Scaffolding Limited | Construction | 1989 |
| Briganti Adams Ltd | Other services | 2007 |
| Brigham & Cowan (Hull) Limited | | 1909 |
| Brigham & Cowan Limited | | 1919 |
| Bright Minds North East Ltd | Education | 2014 |
| Bright Red Charity | Health & social care | 2018 |
| Bright Steps Community CIC | Health & social care | 2025 |
| Brightest Green Limited | Health & social care | 2019 |
| Brighton & Hove BUS and Coach Company Limited | Transport & logistics | 1935 |
| Brighton Food Stores Limited | Wholesale & retail | 2015 |
| Brightpearl Limited | Information & communication | 2007 |
| Brightsparks Energy Ltd | Professional & scientific | 2026 |
| Brighty Contracts Limited | Construction | 2014 |
| Brimley's Bathroom and Kitchen Fitters Ltd | Construction | 2023 |
| Brinkburn Place (Longframlington) Management Company Limited | Households | 2022 |
| Brinkburn Street Brewery Ltd | Manufacturing | 2015 |
| Brinstock Limited | Professional & scientific | 2016 |
| Brisbay Limited | Manufacturing | 1983 |
| Bristolcap LP | | 2017 |
| Britannia Furnishings Ltd | Wholesale & retail | 2022 |
| Britannia Picture Framing Limited | Manufacturing | 2022 |
| Brite ARC Ltd | Real estate | 2021 |
| Britevo Ltd | Wholesale & retail | 2025 |
| Britgate Cargo Limited | Wholesale & retail | 2026 |
| British Association of Accountants and Auditors Limited(The) | Other services | 1923 |
| British Blood Transfusion Society(The) | Education | 1983 |
| British Compressed Air Society Limited | Other services | 1998 |
| British Engines (UK) Limited | Financial services | 2010 |
| British Engines Holdings Limited | Financial services | 2023 |
| British Engines Limited | Financial services | 2010 |
| British Free Range EGG Marketing Limited | Other services | 2000 |
| British Free Range EGG Producers Association Limited | Other services | 2023 |
| Britspire UK Ltd | Real estate | 2025 |
| Brize Meadow Investments Limited | Real estate | 2023 |
| BRO Well Holdings Limited | Financial services | 2025 |
| Broad Chare Associates Limited | Professional & scientific | 2013 |
| Broad Chare Partnership LLP | | 2013 |
| Broad Organisation Ltd | Administrative & support | 2018 |
| Broadcrystal Limited | Information & communication | 1994 |
| Broadgarth Management Limited | Real estate | 2013 |
| Broadhall Developments Ltd | Real estate | 2003 |
| Broadmedia Holdings Limited | Information & communication | 2007 |
| Broadoak Asset Management Ltd | Real estate | 2014 |
| Broadoaks (Bedlington) Management Company Limited | Households | 2017 |
| Broadwater Property Management Limited | Real estate | 2014 |
| Broadway Cabs Limited | Transport & logistics | 2023 |
| Broadway Transport Limited | Administrative & support | 2008 |