| British Society of Hearing AID Audiologists Limited | Crewe | 1993 |
| British Society of Soil Science | Bedford | 2009 |
| British South India Council of Commerce Limited | Basingstoke | 2012 |
| British Specialist Nutrition Association Limited | London | 2007 |
| British Sporting Investments Limited | | 2004 |
| British Stainless Steel Association | Sheffield | 2011 |
| British Television Distributors Association | London | 1998 |
| British Tennis Coaches Association Limited | Rayleigh | 2001 |
| British Texel Sheep Society Limited (the) | Lanark | 1974 |
| British Textile Machinery Association | Manchester | 2004 |
| British Thoracic Oncology Group | Loughborough | 2015 |
| British Tours Limited | London | 1932 |
| British Toxicology Society(The) | Lichfield | 1982 |
| British Toy & Hobby Association Limited | London | 1944 |
| British Tractor Pullers Association | Chorley | 1987 |
| British Troops Remembered CIC | Wolverhampton | 2021 |
| British Tyre Manufacturers' Association Limited | Colchester | 1968 |
| British Ukrainian Chamber of Commerce | London | 1997 |
| British Union for the Abolition of Vivisection | | 1929 |
| British Valve and Actuator Association Limited | Banbury | 1973 |
| British Vehicle Rental and Leasing Association Limited | Buckinghamshire | 1967 |
| British Vendeen Sheep Society Limited | Carlisle | 1982 |
| British Warm-Blood Horses Company Limited | Bodmin | 1986 |
| British Water | London | 2000 |
| British Wireless for the Blind Fund | Lichfield | 1999 |
| British Women Pilots Association Limited | Colchester | 2017 |
| British Youth for Christ | Brierley Hill | 1970 |
| British-American Chamber of Commerce | London | 1921 |
| British-Kazakh Society | Dartford | 2002 |
| British-Moldovan Business Association | London | 2007 |
| British-Qatari Society Limited | London | 2023 |
| Brito UK Ltd | London | 2020 |
| Briton Plant Holdings Limited | Hertfordshire | 1972 |
| Britons Services Ltd | Bristol | 2024 |
| Britpropfed Limited | London | 2025 |
| Brits Excellence Awards Ltd | London | 2024 |
| Brits Kenilworth Limited | Warwick | 2015 |
| Brits Leamington Limited | Warwick | 2015 |
| Brits Warwick Limited | Warwick | 2019 |
| Britsafety Ltd | Westcliff-On-Sea | 2025 |
| Britscott Ltd | London | 2024 |
| Britsilk Wellness Lounge (UK) Limited | Kington | 2025 |
| Britsoul Ltd | Bradford | 2022 |
| Britsporthealth Limited | London | 2007 |
| Britt-International Limited | Liverpool | 2026 |
| Britta New Conservation Ltd | London | 2021 |
| Brittain & Mcmail Limited | Glasgow | 2017 |
| Brittain Marketing Services Limited | Chichester | 1998 |
| Brittany Corner Management Company Limited | St. Leonards-On-Sea | 2002 |
| Brittany Wilson Coaching Limited | Dunfermline | 2024 |
| Brittish Group. Limited | London | 2017 |
| Britton and Time Mediation Services Limited | Guildford | 2020 |
| Britton Interpreting Limited | Wirral | 2017 |
| Britton-Hillary Ltd | Workington | 2011 |
| Brittons Holdings Limited | Cardiff | 1994 |
| Brittop Limited | Liverpool | 2017 |
| Britts Hairdressers Limited | Grantham | 2021 |
| Britts of Bath Limited | Bath | 2014 |
| Britwis Limited | Nottingham | 2023 |
| Britz Traders Ltd | Southall | 2019 |
| Brix Global Limited | London | 2025 |
| Brixham Archers C.I.C. | Torquay | 2010 |
| Brixham Barbershop Limited | Rugby | 2014 |
| Brixham Community Church | Brixham | 2015 |
| Brixham Does Care | Brixham | 2013 |
| Brixham Laundry Room Limited | Totnes | 2015 |
| Brixham NON Conformist Churchyard Corporate Trustee Limited | Brixham | 2021 |
| Brixham Turkish Barbers Ltd | Brixham | 2019 |
| Brixton Assessment Services Limited | London | 2020 |
| Brixton Barbers London Limited | London | 2022 |
| Brixton BID Limited | Croydon | 2012 |
| Brixton Dominoes Community Club CIC | London | 2025 |
| Brixton DRY Clean Ltd | Brixton | 2024 |
| Brixton DRY Cleaners 786 Limited | London | 2025 |
| Brixton Films Limited | London | 2007 |
| Brixton Home Wares Store Ltd | Brixton | 2026 |
| Brixton Phone and Repair Ltd | London | 2024 |
| Brixton: Medical & Aesthetics Ltd | Wallington | 2018 |
| Brixtonia Trading Company Ltd. | London | 2018 |
| Brixworth Hand Car Wash Ltd | Northampton | 2024 |
| Brixworth Valeting Services Ltd | Northampton | 2021 |
| Brixworth Wills Limited | Northampton | 2017 |
| Briz Kidz Casting Ltd | Bristol | 2016 |
| Brizk Ltd | Greenford | 1998 |
| Brizzle Events Ltd | Berkeley | 2021 |
| Brizzo Beauty Supplies Ltd | Burton On Trent | 2019 |
| Brja Consulting Limited | Thornton Heath | 2017 |
| Brkd Group Limited | Abingdon | 2024 |
| BRL Dentos Ltd | London | 2013 |
| BRL Events Ltd | London | 2021 |
| Brlc Ltd | Stansted | 2025 |
| BRM (London) Limited | London | 2018 |
| BRM Events Ltd | Co Derry | 2025 |
| BRM229 Company Limited | Ashford | 2021 |
| Brmc Holdings Limited | London | 2022 |
| Brmc Ltd | London | 2015 |
| Brntprk Ltd | Cambridge | 2022 |
| BRO Blade Barber Ltd | Swansea | 2024 |
| BRO Blades Ltd | Haverfordwest | 2018 |
| BRO MÔN | Holyhead | 2020 |