| Building the Future Awards Ltd | Birmingham | 2024 |
| Building Training Services Ltd | Bridgnorth | 2022 |
| Building Vision (UK) Limited | Minehead | 2007 |
| Building Wealth From Zero Ltd | Knebworth | 2026 |
| Buildingsmart International Limited | Cambridge | 2004 |
| Buildmarque Limited | Essex | 1988 |
| Buildmate Ltd | Barnet | 2008 |
| Buildrow Property Services Ltd | Hoddesdon | 2018 |
| Buildstuff Limited | Bathgate | 2016 |
| Buildsure Paving Limited | Ely | 2019 |
| Buildtall Limited | | 2002 |
| Buildtex Ltd | Wakefield | 2007 |
| Buildtrue (2008) Limited | Leeds | 2008 |
| Buildwise Holdings Ltd | London | 2024 |
| Built 4 Entertainment Ltd | Prescot | 2011 |
| Built Beyond Typical Ltd | Epsom | 2026 |
| Built by Balmer Limited | Ilkeston | 2024 |
| Built by Brett Ltd | Bromsgrove | 2025 |
| Built by Dads Ltd | Tunbridge Wells | 2026 |
| Built by Titanium Ltd | Hungerford | 2023 |
| Built Environment Certifications Ltd | Dartford | 2026 |
| Built Environment Forum Scotland | Edinburgh | 2003 |
| Built Environment Hub Limited | Birmingham | 2013 |
| Built for Balance Limited | Hook | 2026 |
| Built for Life Ltd | Milton Keynes | 2018 |
| Built for Life Ministries | Milton Keynes | 2011 |
| Built Limited | Croydon | 2013 |
| Built With Understanding Limited | Thame | 2011 |
| Built.Inc Limited | Liverpool | 2017 |
| Builtbyrowe Ltd | Windsor | 2026 |
| Builtechnica Ltd | Doncaster | 2025 |
| Builtright Technologies Ltd | London | 2025 |
| Buitelaar Production (UK) Ltd | Wrexham | 2011 |
| Buja Enterprise UK Ltd | Chipping Campden | 2017 |
| Bujay Skincare Ltd | Grays | 2024 |
| BUK Barbers Limited | Enfield | 2026 |
| BUK Money Tax Limited | Loughborough | 2026 |
| Bukbook Limited | London | 2015 |
| Bukhtiarov Business Technologies Ltd | London | 2025 |
| Bukiz Ventures Ltd | London | 2022 |
| Bukkygele INT Makeup Artist Limited | London | 2015 |
| Bukkyslayedit Limited | Harlow | 2023 |
| Bukowski Services Ltd | Thornton Heath | 2019 |
| Bukster Deals Limited | Middleton | 2019 |
| Buky Orija Coaching Limited | Walsall | 2014 |
| Bulair Building Services Ltd | Sutton | 2020 |
| Bulanstar Limited | London | 1978 |
| Bulastar Limited | London | 1990 |
| Bulb Hair and Health Limited | Stourbridge | 2025 |
| Bulb Hair Ltd | Chesham | 2013 |
| Bulduk Turkish Barber Limited | London | 2021 |
| Buler Ltd | London | 2009 |
| Bulgarian Hope Hub CIC | London | 2025 |
| Bulhac Buildings Ltd | Smethwick | 2017 |
| Bulice (East) Ltd | London | 2019 |
| Bulice Limited | London | 2018 |
| Bulior Ltd | London | 2012 |
| Bulk GSM Ltd | Harrow | 2006 |
| Bulk Mail Claim Limited | London | 2023 |
| Bulk Solids & Powder Handling UK Limited | Holmfirth | 2023 |
| Bulk Vending Systems Limited | Swansea | 1994 |
| Bulky Seller Ltd | Margate | 2025 |
| Bulkyfans Ltd | London | 2024 |
| Bull & Co Barbershop Ltd | Bridgnorth | 2022 |
| Bull and Tomato Games Ltd. | Darwen | 2020 |
| Bull Anderson Limited | London | 2024 |
| Bull Farm Barber Limited | Mansfield | 2025 |
| Bull Finance Ltd | London | 2021 |
| Bull in a Barbershop Ltd | Billericay | 2022 |
| Bull Locks Limited | Birmingham | 2017 |
| Bull-Riders of Montana Limited | London | 2024 |
| Bullafit Ltd | London | 2022 |
| Bullari Ltd | Romford | 2025 |
| Bullclean Ltd | Birmingham | 2022 |
| Bulldog and Bear Barbershop Limited | Northampton | 2018 |
| Bulldog and Bear Hair Replacement Limited | Northampton | 2020 |
| Bulldog and Bear Kettering Limited | Barton Seagrave | 2022 |
| Bulldog and Bear Weedon Limited | Weedon | 2021 |
| Bulldog Barbers Ltd | Ascot | 2026 |
| Bulldog Club (Incorporated) | Gerrards Cross | 1894 |
| Bulldog Drainage Ltd | Workington | 2017 |
| Bulldog Holidays Limited | Crawley | 2016 |
| Bulldog Rescue and Re-Homing Trust | Midhurst | 2006 |
| Bulldog Sunbeds Limited | Kings Lynn | 2024 |
| Buller Engineering Services Ltd | Manchester | 2014 |
| Bullet Promotions Limited | Stanmore | 2018 |
| Bullet Proof Mindset Limited | London | 2020 |
| Bulletproof Design Limited | London | 2001 |
| Bulletproof Limited | London | 2011 |
| Bulletproof Performance Ltd | London | 2025 |
| Bullhegge Ltd | Buckingham | 2019 |
| Bullinger Holdings Limited | Tunbridge Wells | 2018 |
| Bullingstone Associates Limited | London | 2024 |
| Bullion Bridge Ltd | London | 2020 |
| Bullion Coffee Ltd | Harlow, Essex | 2021 |
| Bullion Community Resource Centre | Chester Le Street | 2000 |
| Bullion Xpress.Co.Uk Limited | Dewsbury | 2022 |
| Bullion's Services Ltd | Slough | 2018 |
| Bullman Design Limited | West Midlands | 1995 |
| Bullo CUT Ltd | London | 2024 |