| Budding Partnership Ltd | Loughton | 2022 |
| Buddy & Co. Pictures Ltd | Liverpool | 2026 |
| Buddy & WOO Ltd | Bedford | 2019 |
| Buddy BOY Ltd | London | 2025 |
| Buddy BOY Productions Ltd | Stokenchurch | 2025 |
| Buddy Entertainment Limited | London | 2024 |
| Buddy Exercise Ltd | Tadworth | 2021 |
| Buddy Music UK Ltd | Bridgwater | 2019 |
| Buddy Player Ltd | Surbiton | 2019 |
| Buddy Productions Limited | London | 2023 |
| Buddy Worldwide Limited | Cheltenham | 2009 |
| Buddy's Drum Centre Limited | Shipley | 2017 |
| Buddy, BO & Co. Ltd | Torquay | 2015 |
| Buddys Adventures Ltd | Airdrie | 2025 |
| Bude and North Cornwall Golf Club,Limited(The) | Cornwall | 1902 |
| Bude Arts and Music CIC | Bude | 2016 |
| Bude Chess Centre Ltd | Bude | 2023 |
| Bude Haven Recreation Ground | Cornwall | 1923 |
| Bude Jazz 2012 Limited | Grays | 2012 |
| Bude Literary Festival CIC | Bude | 2024 |
| Budget Castle Hire Ltd | Southampton | 2018 |
| Budget First Productions Ltd | Droitwich | 2025 |
| Budgie Productions Ltd | Wallington | 2023 |
| Budleigh Salterton Cricket Club Limited | Sidmouth | 2011 |
| Budleigh Salterton Croquet Club Limited | Budleigh Salterton | 2006 |
| Budleigh Salterton Games Club Limited | Budleigh Salterton | 2022 |
| Budminster Limited | Uxbridge | 2016 |
| Budmouth Limited | Weymouth | 1991 |
| Budo (Wales) MMA Ltd | Swansea | 2022 |
| Budo Sport Limited | Leeds | 2017 |
| Buds & Blossoms Play Cafe Ltd | Royton | 2025 |
| Buds Fitness Limited | Huntingdon | 2022 |
| Buds FX Limited | Chertsey | 2021 |
| Buena Vida Concierge Ltd | London | 2023 |
| Buena Vista Entertainments Limited | Edinburgh | 2004 |
| Buff Body Butlers Ltd | Leeds | 2021 |
| Buff Business Group Ltd | London | 2020 |
| Buffalo Collective Ltd | Bristol | 2024 |
| Buffalo House Ltd | Corsham | 2018 |
| Buffalo Hunter Productions Limited | Dalkeith | 2012 |
| Buffalo Music Limited | Richmond | 1983 |
| BUFFALO33 Ltd | London | 2025 |
| Buffay Entertainments Ltd | York | 2019 |
| BUG Art Limited | Chesterfield | 1999 |
| BUG Artist Ltd | Pont-Y-Clun | 2026 |
| BUG Eyed Studios Ltd | Ilford | 2026 |
| BUG House C.I.C. | London | 2025 |
| Bugatti Molsheim Limited | Cheltenham | 1987 |
| Bugatti Owners' Club,Limited(The) | Cheltenham | 1930 |
| Buggy Tintern Ltd | London | 2022 |
| Buggy Tunes Limited | Wigan | 2009 |
| Bugler for Hire Ltd | Birmingham | 2025 |
| Bugrat Limited | London | 2025 |
| Bugs Direct Limited | Torquay | 2007 |
| Bugtopia (Hornsea) Ltd | Tugby | 2016 |
| BUI Management Ltd | Enfield | 2021 |
| Build & Design for YOU Limited | London | 2007 |
| Build a Baller Ltd | Bury | 2023 |
| Build a Ring Ltd | Manchester | 2024 |
| Build Coaching Ltd | Bristol | 2016 |
| Build Harvest Limited | London | 2025 |
| Build Influence Limited | Berkhamsted | 2026 |
| Build IT and They Will Come Ltd | Ross-On-Wye | 2019 |
| Build Live Know Limited | London | 2015 |
| Build ME Mini Limited | Faversham | 2019 |
| Build RIG Light Ltd | Kington | 2025 |
| Build Show Break Ltd | Stockport | 2025 |
| Build! Community Ventures CIC | Chorley | 2025 |
| Builders Club London Limited | Ashford | 2013 |
| Builders Crown Limited | Haverfordwest | 1989 |
| Building Better Athletes Ltd | Perth | 2021 |
| Building Better Humans Ltd | Windsor | 2015 |
| Building Culture CIC | Durham | 2016 |
| Building Futures Through Sport Community Interest Company | Sutton Coldfield | 2022 |
| Building INK Ltd | London | 2026 |
| Building Lifelong Improvements Nailing Decisions Ltd | Wigan | 2024 |
| Building Lives Around Shirebrook Town CIC | Mansfield | 2020 |
| Building Mood Studio Ltd | Salford | 2025 |
| Building the Bridge CIC | Manchester | 2024 |
| Buildwas Leisure Limited | Telford | 2003 |
| Built by AMC Limited | Greenford | 2024 |
| Built by Balance Ltd | Glasgow | 2023 |
| Built by Barn Limited | Cirencester | 2018 |
| Built by Bone Ltd | Swadlincote | 2024 |
| Built by DAN: Fitness and Nutrition Ltd | Manchester | 2022 |
| Built by Habit Ltd | London | 2026 |
| Built by Novo Crossfit Ltd | Bexhill | 2016 |
| Built by York Ltd | Tooting | 2025 |
| Built Collective Ltd | Cirencester | 2025 |
| Built Different Sports Ltd | London | 2019 |
| Built Fitness Ltd | London | 2023 |
| Built for Anything Limited | Bognor Regis | 2025 |
| Built NOT Born Limited | Wokingham | 2023 |
| Built on Balance Ltd | Sutton | 2026 |
| Built Performance Limited | Manchester | 2025 |
| Built Training Limited | Ashford | 2021 |
| Built With Irons Ltd | Newcastle Upon Tyne | 2025 |
| Builtbyben Limited | London | 2023 |
| Builth Wells Golf Club (1987) Limited | Builth Wells | 1987 |
| Builth Wells Motor Club Limited | Powys | 2003 |