| Bialive Entertainment Ltd | Lytham St. Annes | 2024 |
| Bialyhoos of 1942 Ltd | London | 2022 |
| Bianca Batson Limited | London | 2022 |
| Bianca Raffaella Ltd | Bolton | 2025 |
| Bianca Walkden Limited | Liverpool | 2017 |
| Bianca.S.Scott Ltd | London | 2024 |
| Bianco E Azzurro Ltd | Aberdeen | 2024 |
| Bibble Bobble Productions Ltd | Cambridge | 2021 |
| Bibby Media Limited | London | 2014 |
| Bibby Racing Limited | Consett | 2025 |
| Bibbys Coin OP Limited | Rickmansworth | 2013 |
| Bibbys Farm Limited | Bolton | 2004 |
| Bibi Lucille Ltd | Twickenham | 2025 |
| Bibill Pictures Limited | London | 2024 |
| Bibitibop Ltd | Sutton | 2025 |
| Bible, Babes & Banter Ltd | London | 2026 |
| Biblical Life Ltd | Reading | 2025 |
| Bibliogenics Ltd | Corsham | 2019 |
| Biblioteka CIC | London | 2022 |
| Biblooos Ltd | London | 2025 |
| Bicester and Whaddon Chase Limited | Bicester | 2003 |
| Bicester Boxing Club Ltd | Bicester | 2020 |
| Bicester Rugby Union Football Club Ltd | Bicester | 2002 |
| Bichri Fitness Limited | St Albans | 2025 |
| Bickley Park Cricket Club Limited | Bromley | 1956 |
| Bicknell Limited | London | 2003 |
| Bicoja Ltd | Chelmsford | 2022 |
| Bicycle Adventure Club CIC | Birmingham | 2023 |
| Bicycle Moaning Collective Limited | Chislehurst | 2016 |
| BID Beauty Ltd | Hitchin | 2025 |
| BID US Investors Limited | Birmingham | 2025 |
| BID2ME Limited | Dumbarton | 2025 |
| BID4BEATS Limited | Cardiff | 2019 |
| Biddestone Cricket Club Limited | Chippenham | 2024 |
| Biddestone Village Hall and Recreation Trust | Chippenham | 2015 |
| Biddick Breaking and Pre-Training Limited | Yeovil | 2018 |
| Biddle Leisure Limited | Congleton | 2002 |
| Biddz Boxing Limited | Southampton | 2019 |
| Bideford AFC (1987) Limited | Bideford | 1987 |
| Bideford Littleham and Westward HO! Cricket Club Limited | Barnstaple | 2012 |
| Bideford Railway Heritage Centre Community Interest Company | Bideford | 2007 |
| Bideford Rugby Football Club Limited | Bideford | 2010 |
| Bidford Community Library Ltd | Bidford-On-Avon | 2012 |
| Bidford Gliding and Flying Club Limited | Alcester | 2010 |
| Bidgood Ellison Gyms Ltd | Stourport-On-Severn | 2021 |
| Bidston Golf Club Limited(The) | Merseyside | 1947 |
| Bidston Lighthouse C.I.C. | Prenton | 2015 |
| Bien Etre Studio Limited | Hythe | 2018 |
| Bien Joué Ltd | Guildford | 2024 |
| Bienne International Ltd | London | 2020 |
| Biffco Music Publishing Limited | London | 1998 |
| Big 4 Rocks Limited | London | 2017 |
| Big Adventures Theatre Company Limited | Swadlincote | 2000 |
| Big AL Events Ltd | Tannochside | 2017 |
| Big and Bouncy Ltd | Liverpool | 2025 |
| Big Andy's Gym Ltd | Norwich | 2016 |
| Big Ange Limited | London | 2023 |
| Big Apple (Superbowl) Limited | Wimborne | 2008 |
| Big Apple Entertainments (Holdings) Limited | Wimborne | 2017 |
| Big Apple Entertainments Limited | Dorset | 2006 |
| Big Arch Ltd | Orpington | 2023 |
| Big AXE Throwing Ltd | Southampton | 2022 |
| Big B Entertainment Ltd | Reading | 2023 |
| Big Bang Boxing Ltd | London | 2023 |
| Big Bang Elite Promotions Ltd | London | 2021 |
| Big Bang Talent Ltd | Lytham | 2021 |
| Big Bangz UK Ltd | Southampton | 2024 |
| Big Bash & Corporate Entertainment Limited | Stourport On Severn | 2011 |
| Big Bear Events Limited | Rugby | 2016 |
| Big Beastie Competitions Ltd | Banchory | 2023 |
| Big BEE Events Limited | Manchester | 2021 |
| Big Belly Entertainment Limited | Portsmouth | 2022 |
| Big BEN Music Limited | London | 1971 |
| Big Bidz Competitions Ltd | Fakenham | 2020 |
| Big Big Love Ltd | St. Albans | 2023 |
| Big Black Box Ltd | Preston | 2021 |
| Big Boat's Training Room Ltd | London | 2021 |
| Big Bold Youth CIC | Newport Pagnell | 2017 |
| Big Boots Theatre Company Limited | Wickford | 2016 |
| Big Box Gym Limited | Huddersfield | 2021 |
| Big Box Leisure Club Limited | Huddersfield | 2023 |
| Big Box Ventures Ltd | London | 2022 |
| Big BOY Empire Ltd | Loughton | 2022 |
| Big Brain Racing Ltd | Doncaster | 2022 |
| Big Branch Ltd | London | 2006 |
| Big Break Promotions Ltd | Watford | 2020 |
| Big Break Snooker Ltd | Keighley | 2016 |
| Big Bright Ltd. | Brighton | 2012 |
| Big Brother Promotion Company Limited | Southend On Sea | 2002 |
| Big Brum (Theatre in Education) Company Limited | Birmingham | 1983 |
| Big BUS Screen Events Ltd | Southport | 2026 |
| Big Buzz Ltd | Basildon | 2025 |
| Big Canyon Club Ltd | Surbiton | 2025 |
| Big Car Boots Co. Limited | Colchester | 2003 |
| Big Carp Giveaways Ltd | Cobham | 2023 |
| Big Cats Music Ltd | London | 2007 |
| Big Cheese Comedy Club Ltd | Ipswich | 2009 |
| Big Christmas Concert Ltd | York | 2025 |
| Big City Artworks Ltd | London | 2021 |
| Big City Productions Limited | Borehamwood | 2003 |