| Business Thing Ltd | Cardiff | 2024 |
| Business Trade Direct Limited | Weatherby | 2020 |
| Business Traffic Solutions Limited | Dagenham | 2017 |
| Business Travel Association Limited | Ashford | 1987 |
| Business Travel Limited | London | 2017 |
| Business Travel News Limited | Edgware | 1993 |
| Business Tuning Limited | Leigh-On-Sea | 2010 |
| Business TV Ltd | London | 2024 |
| Business UK. B2G & G2B Ltd | Cranleigh | 2026 |
| Business United CIC | Hove | 2024 |
| Business West (Holdings) | Bristol | 1874 |
| Business West Limited | Bristol | 2013 |
| Business Worldwide Limited | Reading | 2011 |
| Businesscare UK Limited | London | 2017 |
| Businessldn | London | 1992 |
| Businessopedia Limited | Macclesfield | 2019 |
| Businessopportunities.Com Limited | London | 2000 |
| Businessview Consulting Limited | Bromley | 2012 |
| Busola Jegede International Ministry | Cambridge | 2016 |
| Busra Barbers Ltd | Hull | 2026 |
| Busson Limited | Bucks | 1957 |
| Bussybodevents Limited | Manchester | 2025 |
| Bust Canton Barbar Shop Ltd | Cardiff | 2022 |
| Buster Films Limited | Harrow | 1986 |
| Busy BEE Cleaning Limited | Telford | 2002 |
| Busy BEE Laundry Services Limited | St. Columb | 2023 |
| Busy Bees Locks & Doors Ltd | Brentwood | 2004 |
| Busy Bees Repairs Limited | Leicester | 2016 |
| Busy Bins Limited | Heywood | 2015 |
| Busy B’S Laundrette Ltd | Exmouth | 2022 |
| Busy Celine Ltd | Kingston Upon Thames | 2024 |
| Busy Clapham Ltd | Dorchester | 2023 |
| Busy Cleaning Ltd | Birmingham | 2011 |
| Busy Clinic Ltd | Bury St. Edmunds | 2023 |
| Busy Hands Car Wash Ltd | Whalley | 2019 |
| Busy Kids Daycare Ltd | Dungannon | 2012 |
| Busy Paws Ltd. | Bristol | 2012 |
| Busy Psdeco Limited | Slough | 2015 |
| Busy Weybridge & Woking Ltd | Woking | 2025 |
| Busy-Bobbins Limited | Nottingham | 2016 |
| Busybeez Ltd | Broxbourne, | 2018 |
| Busybodies Wellness Ltd | Romford | 2022 |
| Busybus Holdings Limited | Liverpool | 2025 |
| Busyfingers Hair Ltd | London | 2025 |
| Busylizzy Epsom and Leatherhead Limited | Grimsby | 2018 |
| Busylizzy Herts Limited | Hertford | 2021 |
| Busylizzy Reigate & Horley Limited | Worthing | 2017 |
| Busylizzy SW London Limited | London | 2023 |
| Busylizzy Wimbledon MUM Ltd | London | 2019 |
| Buta Limited | | 1976 |
| Butcher BOY Barber Ltd | Borehamwood | 2019 |
| Butcheroo Limited | Liverpool | 2025 |
| Butchers and Drovers Charitable Institution | Sheffield | 2014 |
| Butchers Barber Shop Ltd | London | 2015 |
| Butchers Chop Shop Ltd | Retford | 2020 |
| Butchers Removal & Storage Co. Limited | Dereham | 2009 |
| Bute Community Land Company | Rothesay | 2009 |
| Bute Estate Developments Limited | Edinburgh | 2004 |
| Bute House Aesthetics Ltd | Newmarket | 2019 |
| Bute Nathan and Solomon Limited | Sheffield | 2015 |
| Bute ST Beauty Limited | London | 2017 |
| Bute Street Young Ltd | London | 2019 |
| Butfam Investments Limited | Lichfield | 2025 |
| Buthrobinson Limited | London | 2005 |
| Buti Limited | Solihull | 2024 |
| Butler & Bone Ltd | London | 2025 |
| Butler & Morabito Ltd | Warrington | 2023 |
| Butler and Lawler Limited | London | 2001 |
| Butler Doors Ltd | Benton | 2013 |
| Butler Exclusive Ltd | Liverpool | 2024 |
| Butler Solent Limited | Epping | 1993 |
| Butler's Barbering Limited | Leeds | 2022 |
| Butler's Linen Ltd | Edinburgh | 2013 |
| Butler's Window Cleaning Services Limited | Marlborough | 2003 |
| Butler-Smith Grit Limited | Stafford | 2024 |
| Butlerinstallations Ltd | London | 2017 |
| Butlers Barber Shop Limited | Carrickfergus | 2018 |
| Butlers Cleaning Service Limited | Southampton | 2014 |
| Butlers Drycleaners Ltd | London | 2016 |
| Butlers Hair Studio Ltd | Newquay | 2018 |
| Butlers Quarters Ltd | Muir Of Ord | 2026 |
| Butlers With Bums Limited | Brighton | 2011 |
| Butsakon Thai Massage, Nails and Beauty Ltd | Doncaster | 2021 |
| Butt Fashion Studio Limited | London | 2002 |
| Buttaboxx Limited | London | 2020 |
| Butterchoclocs Ltd | Croydon | 2020 |
| Buttercrane Traders Association Limited | Newry | 1989 |
| Buttercup Beauty Limited | London | 2026 |
| Buttercup Children's Trust | Bradford | 2008 |
| Buttercup I.T Limited | Cardiff | 2001 |
| Buttercups Playhouse Limited | Otley | 2026 |
| Buttercups Soft Play Ltd | Otley | 2020 |
| Butterdon Transformation Solutions Ltd | Ivybridge | 2026 |
| Butterfield Property Management Limited | Penmaenmawr | 2022 |
| Butterflies 8Y8 Limited | Abingdon | 2024 |
| Butterflies and Bugs Limited | Newcastle Upon Tyne | 2012 |
| Butterflies Beauty Ltd | Gloucester | 2023 |
| Butterflies Childcare Limited | London | 2010 |
| Butterflies Flying Limited | Liverpool | 2023 |
| Butterflies Memory Loss Support Group | York | 2015 |