| Bradshaw Stairlifts Ltd | Chigwell | 2016 |
| Bradshaw-Brooks Ltd | Sunbury-On-Thames | 2020 |
| Bradstone Investments Limited | Glasgow | 2020 |
| Bradtek Solutions Limited | Stockport | 2003 |
| Bradva Ltd | Glasgow | 2025 |
| Bradwall Limited | Sandbach | 2021 |
| Bradweld Fabrications Limited | Eccles | 2007 |
| Brady and Braehead Ltd | Edinburgh | 2021 |
| Brady Bags Ltd | Sutton Coldfield | 2018 |
| Brae Block Moulds Limited | Dungannon | 2010 |
| Brae Edge Services Limited | Stornoway | 2020 |
| Brae Little Ltd | Brackley | 2023 |
| Brae Scotland Limited | Glasgow | 2025 |
| Braeburn Studios Limited | Cheltenham | 2024 |
| Braefield Engineering Ltd | Great Dunmow | 1967 |
| Braehead Ballyholey Ltd | Belfast | 2023 |
| Braehead Foods Limited | Kilmarnock | 1999 |
| Braehead Metals Limited | Glasgow | 1983 |
| Braemar Brewing Co. Ltd | Braemar | 2019 |
| Braemar Chocolate Shop Ltd | Braemar | 2016 |
| Braemere Models Ltd | Wigan | 2022 |
| Braeriach Holdings Ltd | London | 2022 |
| Braes Bakery Ltd | 38/40 New City Road | 2005 |
| Braescu Aviation Ltd | Cambridge | 2025 |
| Brafe Engineering Limited | Suffolk | 1966 |
| Brag Engineering Limited | Tyne & Wear | 1990 |
| Brag MUN Limited | Coventry | 2016 |
| Bragarzidi Ltd | Bromsgrove | 2005 |
| Bragdy Cybi Ltd | Holyhead | 2019 |
| Bragdy Lleu CYF | Penygroes | 2013 |
| Bragdy Mona CYF | Gaerwen | 2018 |
| Bragdy Nant CYF | Sir Conwy | 2009 |
| Bragdy NI CYF | Aberystwyth | 2023 |
| Bragdy Nonsens CYF | Menai Bridge | 2023 |
| Bragdy Torri Syched CYF | Talybont | 2025 |
| Brago Engineering Services Limited | Wigan | 2016 |
| Braham and Dixon (1985) Limited | | 1982 |
| Braham Glazing Ltd | Slough | 2019 |
| Brahm Mirror Creations Ltd | Harrow | 2026 |
| Brahmani Home Limited | Guildford | 2025 |
| Braid Engineering Limited | Belfast | 2009 |
| Braidbar Boats Ltd | Stockport | 2008 |
| Braided Cords Manufacturing Ltd | Shaftesbury | 2017 |
| Braidlock Limited | Warrington | 2004 |
| Brailer Ltd | Kenilworth | 2018 |
| Braille Forge Ltd | Wokingham | 2025 |
| Braille Pages Ltd | Chigwell | 2023 |
| Braille Signs UK Ltd | Rochdale | 2023 |
| Brailsford Shore Limited | Derby | 2007 |
| Braime Pressings Limited | Leeds | 1923 |
| Brain Audio Systems Limited | Enfield | 2010 |
| Brain Brew UK Limited | Windsor | 2018 |
| Brain Feed Ltd | Manchester | 2015 |
| Brain Frog Nootropics Ltd | Folkestone | 2026 |
| Brain FUD Ltd | Northampton | 2016 |
| Brain Health NOW Ltd | Rossendale | 2023 |
| Brain MAT UK Limited | Stockport | 2021 |
| Brain Melt Group Ltd | Liverpool | 2022 |
| Brain Power Industries Limited | Rugby | 1996 |
| Brain Power International Limited | Rugby | 1984 |
| Brain Science Experts Limited | Stafford | 2025 |
| Brain-Life Ltd | London | 2024 |
| Brainalyze Ltd | Southampton | 2025 |
| Brainbox Creations Ltd | Pontyclun | 2023 |
| Brainbox Ideas UK Ltd | Nottingham | 2024 |
| Brainboxes Limited | Speke | 1996 |
| Brainer CJ Ltd | Thornton Heath | 2017 |
| Brainflowers Limited | Fareham | 2025 |
| Braingaze Ltd | New Malden | 2022 |
| Brainmod Limited | Poole | 2024 |
| Brainox Ltd | London | 2025 |
| Brainpatch Ltd | Cambridge | 2018 |
| Brains Brands Ltd | Sandwich | 2019 |
| Brainstorm U.K. Limited | Leicester | 2021 |
| BRAINTRAIN2020 Limited | Sheffield | 2013 |
| Braintree Electro Platers Limited | Halstead | 1971 |
| Braintree Engineering Company Limited | Braintree | 2004 |
| Braintree Joinery Ltd | Halstead | 2022 |
| Braintree Precision Components Limited | | 1989 |
| Braintree Supplies Ltd | Westcliff-On-Sea | 2012 |
| Brainwave Brands Ltd | Gateshead | 2013 |
| Brainworks (Food) Limited | Hull | 2016 |
| Braisen Ltd | London | 2019 |
| Braithwaite Engineers Limited | Newport | 1987 |
| Braithwell Limited | 3 Grove Road Wrexham | 2002 |
| Brake Bonding Ltd. | Southport | 2013 |
| Brake Caliper Solutions Ltd | Leicester | 2020 |
| Brake Lathes UK Ltd | Cheltenham | 2025 |
| Brake Pipe Flaring Tools Limited | Hinckley | 2010 |
| Brake Relining Services Ltd. | Falkirk | 2015 |
| Brake-Master Limited | Bristol | 2022 |
| Brakes Cider Ltd | Wrington | 2020 |
| Brakesafe Ltd | Cardiff | 2013 |
| Brakesense Ltd | Wakefield | 2025 |
| Braleche Ltd | London | 2019 |
| Braltex Limited | Leeds | 1982 |
| Bram Enterprises Limited | Warrington | 2019 |
| Bramah Security Centres Limited | London | 1969 |
| Bramah Security Equipment Limited | London | 1934 |
| Bramall Property Developers Ltd | Warrington | 2020 |