| Break Trading Company Limited | Norwich | 1977 |
| Breakblock Limited | York | 1997 |
| Breakerbox Ltd | Elland | 2025 |
| Breakerspro Ltd | London | 2022 |
| Breakfree Forever Consultancy Limited | Waltham Abbey | 2018 |
| Breaking Boundaries Ltd | London | 2024 |
| Breaking the Cycle Community Interest Company | Margate | 2017 |
| Breakout Leisure Ltd | Bristol | 2024 |
| Breakout World Limited | Haverfordwest | 2001 |
| Breakthroughinnovators Limited | Chepstow | 2011 |
| Breaktime Limited | London | 2011 |
| Breatech Limited | London | 2022 |
| Breath Therapy Ltd | Shipston On Stour | 2023 |
| Breathaboard Limited | Ashbourne | 2016 |
| Breathe Charging Limited | Braintree | 2025 |
| Breathe Consultants Limited | Braintree | 2017 |
| Breathe Finance Limited | Knutsford | 2011 |
| Breathe HR Ltd | Horsham | 2020 |
| Breathe to BE YOU Ltd | Hove | 2024 |
| Breathe With Ease Ltd | Eastbourne | 2023 |
| Breathing Space Clinic Ltd | Broadstairs | 2019 |
| Breathtaking Limited | London | 1999 |
| Brechin Commercial Limited | London | 2018 |
| Brechin Freehold Limited | | 2003 |
| Brechin Investments NO. 2 Limited | Chagford | 2020 |
| Brechin Investments NO.3 Limited | Chagford | 2024 |
| Brechin Residential Limited | London | 2018 |
| Breckland Mouldings Limited | Manchester | 1979 |
| Breckland Pest Control Ltd | Huddersfield | 2026 |
| Brecon Care (PYB) Ltd | Wolverhampton | 2017 |
| Brecon Debt Recovery Limited | Leicester | 1965 |
| Brecon Freeholds Limited | Edgware | 1962 |
| Breda Plant Tech Co., Ltd | Kenilworth | 2023 |
| Bredcroft Limited | Stamford | 2015 |
| Breechland 1965 Limited | Wisbech | 2014 |
| Breed Communications Limited | London | 2019 |
| Breeding Endangered Species Trust | Orpington | 2013 |
| Breedline Services Limited | Kenilworth | 2004 |
| Breedon House Group Limited | Nottingham | 2008 |
| Breedon House Holdings Limited | Nottingham | 2010 |
| Breedon Properties Limited | Derby | 2009 |
| Breedon Scotland Limited | Monifieth | 2003 |
| Breedon Southern Limited | Derby | 2011 |
| Breedon Surfacing Solutions Limited | Derby | 1974 |
| Breeez Limited | Nottingham | 2018 |
| Breenco Ltd | London | 2024 |
| Breensco Limited | Wokingham | 2022 |
| Breese Estates Ltd | Tamworth | 2020 |
| Breeze Card Ltd | Prestatyn | 2024 |
| Breeze Hill Capital Management Ltd | Manchester | 2026 |
| Breeze International Designs Ltd | Liverpool | 2011 |
| Breeze Property Management Limited | Dunmow | 1997 |
| Breeze Valley Business Advisors Ltd | Manchester | 2026 |
| Breezemount Transport Limited | Lisburn | 2012 |
| Breezy Properties Ltd | York | 2024 |
| Breezy Tech Ltd | Redditch | 2018 |
| Breitstone Estates Ltd | Dewsbury | 2022 |
| Brekke Fisk Limited | London | 2023 |
| Breland Housing Limited | Purley | 2008 |
| Bremner 1969 Limited | Horley | 2014 |
| Bremtech Limited | Lancashire | 2001 |
| Bren Construction Limited | Manchester | 2024 |
| Brenbar Building Services Limited | Romford | 2015 |
| Brenchmark Consulting Ltd | Heskin | 2016 |
| Brenco Ltd | Ilford | 2017 |
| Brenda Jacqueline Selina Scott Limited | London | 2023 |
| Brenda Michelle Weeks Limited | South Croydon | 2025 |
| Brenda Phillips Ltd | Haverhill | 2024 |
| Brendan & Co Limited | London | 2024 |
| Brendan Callaghan Limited | Co Antrim | 2004 |
| Brendecs Ltd | Liverpool | 2024 |
| Brenden Allservice Limited | London | 2019 |
| Brenhill Limited | London | 2016 |
| Brenmar Electrical Limited | Durley | 1994 |
| Brennan & Wilson Architects Limited | Dunbar | 2023 |
| Brennan Investments Group Ltd | Manchester | 2020 |
| Brennand 1968 Limited | Halesowen | 2015 |
| Brennevinasa Limited | London | 2026 |
| Brenroyd Holdings Limited | London | 1978 |
| Brent Europe Limited | Milton Keynes | 1975 |
| Brent Walker Finance Limited | | 1976 |
| Brenthall Park (Commercial) Limited | Brentwood | 1989 |
| Brenthall Park (Infrastructure) Limited | Brentwood | 1989 |
| Brenthall Park (One) Limited | Brentwood | 1989 |
| Brenthall Park (Three) Limited | Brentwood | 1989 |
| Brenthall Park Limited | Brentwood | 1985 |
| Brenton & Chase Ltd | Doncaster | 2026 |
| Brentstand Limited | London | 2017 |
| Brentwood Coaches Limited | Dunmow | 2025 |
| Brereton and Co Ltd | Nr Somerton | 2011 |
| Bretany Ltd | Cambridge | 2005 |
| Breton Crust Limited | Weybridge | 2010 |
| Breton House Management Limited | Plymouth | 2002 |
| Brett Fuels Limited | Birchwood | 2005 |
| Brett Vale Residential Homes Limited | Great Yarmouth | 2005 |
| Bretwalda Ltd | Sidcup | 2020 |
| Breval Environmental Limited | Bathgate | 2002 |
| Breval Technical Services Limited | Bathgate | 1977 |
| Brevetita Limited | London | 2024 |
| Brevia Consulting Limited | London | 2011 |