| Bubble TUB Hire Ltd | Leamington Spa | 2021 |
| Bubbles and Blossoms Ltd | Desborough | 2024 |
| Bubbles and FUR Ltd | Newcastle Upon Tyne | 2025 |
| Bubbuk Ltd | Bury St. Edmunds | 2021 |
| Bubs and Cubs Limited | Winsford | 2023 |
| Buccal Development Ltd | Stockbridge | 2007 |
| Buccia Ltd | Southampton | 2022 |
| Bucephalus Capital Limited | Bristol | 2001 |
| Buchan Concrete Products Limited | Swadlincote | 2012 |
| Buchan Recruitment Ltd | Abridge | 2021 |
| Buchan Trawlers Limited | Aberdeenshire | 1999 |
| Buchanan Freebird Limited | Eastleigh | 1993 |
| Buchanan Law Limited | London | 2019 |
| Bucholie Consulting Ltd | Ewhurst | 2010 |
| Buckeye Fire Limited | Crawley | 2015 |
| Buckfield Park Limited | Ashford | 2000 |
| Buckingham Covers Ltd | Folkestone | 1999 |
| Buckingham Energy Ltd | Bicester | 2014 |
| Buckingham Gate Tenant Management Company Limited | London | 2017 |
| Buckingham Management (Edgware) Limited | Sudbury | 1995 |
| Buckinghamshire Maintenance Ltd | High Wycombe | 2019 |
| Buckinghamshire Services 2020 Limited | High Wycombe | 2013 |
| Buckinghamshire Solar Ltd | Buckinghamshire | 2023 |
| Buckinghamshire Wildlife Trust Limited | Cumnor | 1999 |
| Buckland Construction Limited | Winchester | 2024 |
| Buckland Flats Management Limited | Watford | 1994 |
| Buckle Shipping Limited | Chadwell Heath | 1986 |
| Bucklebox Ltd | Newcastle Upon Tyne | 2007 |
| Bucklegrove Caravan & Camping Park Limited | Wells | 2002 |
| Bucklers Estates Ltd | London | 2023 |
| Bucklersbury Flat Management Limited | Hove | 1991 |
| Buckley Brown Estate Agents Limited | Nottingham | 2025 |
| Buckley Brown Lettings Limited | Nottingham | 2025 |
| Buckley Two Wheel Centre Limited | Winchester | 2017 |
| Buckley's Mobile Crane Service Ltd | Llandudno | 2009 |
| Bucknall Austin Limited | Birmingham | 2006 |
| Bucknell New Road 1959 Limited | Stoke-On-Trent | 2015 |
| Buckscastle Ltd | Bristol | 2020 |
| Buckshaw Locksmiths Limited | Chorley | 2013 |
| Buckshaw Village Cycles Limited | Chorley | 2017 |
| Buckson Ltd | Hemel Hempstead | 2019 |
| Budbil Buddy Invest Limited | London | 2025 |
| Budbolaget Eskilstuna Limited | London | 2018 |
| Budbringern Express Limited | London | 2008 |
| Buddan Limited | Swansea | 2016 |
| Buddha Bowl Holdings Ltd | Telford | 2025 |
| Budding Enterprises Ltd | Liverpool | 1998 |
| Budding Machinery Group Co., Limited | Manchester | 2011 |
| Budds Lane Limited | Romsey | 1996 |
| Buddyfied Limited | Chippenham | 2009 |
| Bude Club Limited | Cornwall | 1939 |
| Bude Self Storage Limited | Bude | 2003 |
| Bude Storage Solutions Limited | Bude | 2018 |
| Budenberg 4B Trustees Limited | Altrincham | 1996 |
| Budenberg VAC Limited | Altrincham | 1996 |
| Budgad Construction Limited | Oldbury | 2019 |
| Budgens Property Investments Limited | Wellingborough | 2000 |
| Budget Auto Centre STG Ltd | Stirling | 2017 |
| Budget Cremations Limited | Nottingham | 1946 |
| Budget Ltd | London | 2002 |
| Budget Motorist Centres Limited | Winchester | 1985 |
| Budget Pack 2016 Limited | Bristol | 2014 |
| Budget Pest Control Limited | Romford | 2002 |
| Budget Pest Control Supplies Limited | Romford | 2007 |
| Budget Roofing Ltd | Romford | 2013 |
| Budget Skips Limited | Nottingham | 2016 |
| Budgetwell Limited | Stockport | 2004 |
| Budli Limited | London | 2024 |
| Budweiser Budvar Limited | Watford | 1980 |
| Budwell Limited | Horsham | 1998 |
| Bueller Asset Management Limited | London | 2012 |
| Buen Plast Company Limited | Stafford | 2020 |
| Bueno Enterprise Limited | Beckenham | 2013 |
| Bueno Publishing Limited | Torquay | 2020 |
| Buff and Belles Ltd | London | 2022 |
| Buffalo Bolts Limited | Melksham | 1986 |
| Buffavento (UK) Ltd | London | 2014 |
| Buffery Secretaries Ltd | Henley-On-Thames | 2024 |
| Buford Court Management Limited | Durham | 2001 |
| BUG Bear Limited | London | 2015 |
| BUG Eyed Ltd | London | 2024 |
| Bugail Limited | Swansea | 2011 |
| Bugbrooke Nominees Limited | London | 2019 |
| Bugler Property Services Limited | Rickmansworth | 2024 |
| Bugrit Limited | Stafford | 2023 |
| Buhler Sortex Limited | London | 2016 |
| Buick Limited | Harrogate | 2012 |
| Buidheann Beag Distillery Limited | Glasgow | 2018 |
| Build & Plumb Limited | Newcastle Upon Tyne | 2025 |
| Build and Design Property Ltd | Cannock | 2008 |
| Build Bloc (Kent) Limited | Gravesend | 2013 |
| Build Heritage Planning Limited | Tipton | 2012 |
| Build Hollywood (Diabolical Liberties) Limited | London | 1994 |
| Build IT (UK) Limited | Chandlers Ford | 2015 |
| Build-Care Company International Ltd | Harrogate | 2021 |
| Buildbureau Limited | Irlam | 1986 |
| Buildcharm Property Management Limited | Marlow | 2000 |
| Buildeck Scaffold Systems Limited | Newbury | 2020 |
| Builderberg Inc Ltd | Greenford | 2011 |
| Builders Brand Ltd | Manchester | 2009 |