| Bigfoot Live Productions Ltd | London | 2026 |
| Bigfoot Productions UK Limited | Cambridgeshire | 1996 |
| Bigfoot Youth Cycle Club Ltd | Bromley | 2018 |
| Bigga Fish Limited | London | 2001 |
| Biggar & District Community Heritage Limited | Biggar | 2005 |
| Biggar Arts Limited | Dumfries | 2019 |
| Biggar Museum Trust | Biggar | 2011 |
| Biggar Rugby Football Club | Lanark | 2016 |
| Bigger Bang Creative Ltd | Oldham | 2014 |
| Bigger Picture Entertainment Ltd | Bolton | 2017 |
| Bigger Pictures Productions Ltd | London | 2019 |
| Biggest Productions Limited | London | 2018 |
| Biggin Hill Sports Ltd | London | 2026 |
| Biggleswade Arts Collective C.I.C. | Biggleswade | 2021 |
| Biggleswade Flying Group Ltd | Biggleswade | 2016 |
| Biggleswade Swim Academy Limited | Whetstone | 2023 |
| Biggleswade Town Football Club Ltd | Steeple Morden | 1997 |
| Biggleswade Town Management Limited | Steeple Morden | 2007 |
| Biggleswade United Football Club Ltd | Biggleswade | 2025 |
| Biggorilla Apps Ltd | Shoreditch | 2017 |
| Bigharar Radio Ltd | London | 2025 |
| Bighearted Scotland | Edinburgh | 2010 |
| Bight Initiatives CIC | Belfast | 2025 |
| Bigiv Ltd | Strathaven | 2023 |
| Bigkick! Creations Ltd. | Tring | 1999 |
| Bigmediumsmall Limited | Sheffield | 2020 |
| Bignordicenergy Ltd | London | 2025 |
| Bigrhed Ltd | Blisworth | 2025 |
| Bigshots (Northwick Park) Limited | Town Quay | 2019 |
| Bigshots Golf (Europe) Limited | Uxbridge | 2018 |
| Bigshots Golf International Limited | Uxbridge | 2016 |
| Bigswingingovaries Limited | Newcastle Upon Tyne | 2021 |
| Bigtime Radio, TV & Entertainment Group Ltd | Swindon | 2016 |
| Bigupnorth Ltd | Brampton | 2025 |
| Bigups Signs & Graphics Ltd | Plymouth | 2012 |
| Bigwalks Ltd | Carlisle | 2007 |
| Bijan Art Limited | | 2003 |
| Bijin Ltd | London | 2019 |
| Bijli Productions | Glasgow | 2019 |
| Bijou Productions Limited | Wadebridge | 1999 |
| Bijouterie Ayadi Ltd | London | 2025 |
| Bijoyphool Limited | London | 2013 |
| Bike Competitions NI Ltd | Cookstown | 2025 |
| Bike Cornwall | Truro | 2008 |
| Bike Life Competitions Ltd | Rugeley | 2024 |
| Bike Park Chilterns CIC | Chesham | 2019 |
| Bike Smart (Cornwall) Limited | Wadebridge | 2013 |
| Bike Trossachs Community Interest Company | Stirling | 2013 |
| Bike Where YOU Like Ltd | Manchester | 2018 |
| Bikeability Wales | Swansea | 2008 |
| Bikefit LAB Ltd | Tadley | 2026 |
| Bikezone Motorcycle Training Limited | Crewe | 2010 |
| Biking for Children in Care Ltd | Twickenham | 2024 |
| Biking Lighting Limited | Sutton Coldfield | 2012 |
| Bikram (UK) Limited | Harrow | 2012 |
| Bikram Limited | Barnet | 2012 |
| Bikram Yoga Brighton Limited | Portslade | 2009 |
| Bikram Yoga Leicester Ltd | Leicester | 2019 |
| Bikram Yoga London Limited | Harrow | 2009 |
| BIL SHA Boxing Academy C.I.C. | London | 2023 |
| BIL SHA Boxing Club Ltd | London | 2025 |
| Bilancia Art Limited | Liverpool | 2026 |
| Bilates Ltd | Bristol | 2024 |
| Bilb Musical Holdings Limited | Harrow | 2017 |
| Biles Hendry Ltd | Hampton Hill | 2004 |
| Bilete Bangla Cinema Limited | Hounslow | 2019 |
| Bilgin Ltd | Huddersfield | 2020 |
| Bilimankhwe Arts | London | 2006 |
| Bill Amberg Accessories Limited | London | 2015 |
| Bill Amberg Limited | Chippenham | 1994 |
| Bill Banwell Limited | Weston-Super-Mare | 2018 |
| Bill Baylis Music Limited | Essex | 2001 |
| Bill Bruford Productions Limited | Farnham | 1972 |
| Bill Davey Ltd | Carshalton | 2020 |
| Bill Elms Productions Limited | Manchester | 2017 |
| Bill Kenwright Limited | London | 1984 |
| Bill Kenwright Productions Limited | London | 2008 |
| Bill Mata 8 Limited | Newport | 2023 |
| Bill Morrow Fitness Ltd | Belfast | 2022 |
| Bill North Ltd | London | 2025 |
| Billbo Media Ltd | Harrogate | 2026 |
| Billbrook FC Mjpl CIC | Wolverhampton | 2024 |
| Billelis Limited | Petworth | 2018 |
| Billericay Lawn Tennis Club Limited | Billericay | 2013 |
| Billericay Leisure Limited | Billericay | 2020 |
| Billericay Padel Barn Limited | Billericay | 2026 |
| Billericay Supporters Group Limited | Wickford | 2019 |
| Billericay Town Colts Football Club Ltd | Billericay | 2017 |
| Billericay Town Football Club Limited | Billericay | 2001 |
| Billericay Town Women FC Limited | Maldon | 2023 |
| Billi Smiles Entertainment Limited | Crewe | 2013 |
| Billiard Supply Company Ltd | Huddersfield | 2004 |
| Billie James - Oriental Casting Agency Limited | Wallington | 2010 |
| Billie Louise Limited | Maidstone | 2022 |
| Billie Scheepers Studio Ltd | London | 2012 |
| Billie's Trix Limited | London | 2025 |
| Billing OFF Road Experience Limited | Northampton | 2019 |
| Billinge Soccer Centre | Wigan | 2008 |
| Billingham Golf Club,Limited(The) | | 1967 |
| Billingham Ice Hockey Limited | Stockton On Tees | 2002 |