| BTP Studios Ltd | Derby | 2020 |
| BTR Liverpool Limited | Leeds | 2009 |
| BTR Touring Ltd | London | 2013 |
| Btrda Limited | Rugeley | 2001 |
| BTS Roadshow Limited | Thetford | 2024 |
| Btsc | London | 2009 |
| BTW Productions Ltd | Dinas Powys | 2019 |
| BU Film Fest CIC | Halifax | 2023 |
| BU4U Fitness Limited | Rickmansworth | 2022 |
| BU4U Limited | Rickmansworth | 2022 |
| Bubba Jaan Ltd | London | 2025 |
| Bubba London Limited | Harrow | 2017 |
| Bubbas (Plympton) Ltd | Plymouth | 2018 |
| Bubbas (UK) Ltd | Plymouth | 2014 |
| Bubbl WIN Ltd | Bury St. Edmunds | 2026 |
| Bubble and Arch Ltd | London | 2024 |
| Bubble and Squeak Entertainment Limited | London | 2018 |
| Bubble BOY Film Limited | Cambridge | 2024 |
| Bubble Boys Limited | London | 2014 |
| Bubble Chamber Limited | London | 2000 |
| Bubble Creations Limited | Mansfield | 2016 |
| Bubble Football Bermondsey Ltd | London | 2026 |
| Bubble Football Mania Ltd | London | 2014 |
| Bubble House Hire Ltd | Nottingham | 2024 |
| Bubble Kissed Events Ltd | Birmingham, | 2018 |
| Bubble Snaps Ltd | Ipswich | 2021 |
| Bubble Theatre Company Limited (the) | | 1972 |
| Bubblefooty UK Ltd | London | 2024 |
| Bubblegum After School Ltd | London | 2025 |
| Bubblepop Productions Limited | Sunbury-On-Thames | 2011 |
| Bubbles & Breathe Swim School Ltd | Bishop'S Stortford | 2023 |
| Bubbles 'N' Splashes Swim School Limited | Crowborough | 2022 |
| Bubbles (Derby) Ltd | Nottingham | 2007 |
| Bubbles and Swarf Creations Ltd | London | 2021 |
| Bubbles Bounce and Play Limited | London | 2022 |
| Bubbles TV Limited | London | 2004 |
| Bubblin Records Ltd | Ilford | 2023 |
| Bucam Collectibles and Memorabilia Ltd | London | 2023 |
| Buccaneers IHC Limited | Leigh-On-Sea | 2024 |
| Buccleuch Recreational Enterprises Limited | Kettering | 1976 |
| Buccleuch Sporting Limited | Selkirk | 2024 |
| Buch Ltd | Kington | 2013 |
| Buchan Corporate Activities Ltd. | Aberdeenshire | 2003 |
| Buchan Offroad Motorcycle Club | Peterhead | 2004 |
| Buchanan Castle Golf Club Limited | Glasgow | 2016 |
| Buchanan Kerr Limited | Ilford | 1970 |
| Buchanan PR Ltd. | London | 2022 |
| Buchwunder Ltd | Llanelli | 2024 |
| Buck's Army Limited | Preston | 2018 |
| Buckby Health and Leisure Limited | Northamptonshire | 2007 |
| Buckden Marina Limited | Nottingham | 2006 |
| Buckenham Aviation Centre Limited | Buxhall | 2013 |
| Bucket List Raffle Ltd | London | 2025 |
| Bucket Productions Ltd | London | 2022 |
| Bucketrace Limited | London | 2018 |
| Buckfast Butterflies Limited | Devon | 1983 |
| Buckhorn Weston CC Ltd | Gillingham | 2004 |
| Buckhurst Hill FC Foundation | Woodford Green | 1998 |
| Buckhurst Hill Football Club Limited | Woodford Green | 2021 |
| Buckhurst Hill Padel Club Ltd | Fleet | 2025 |
| Buckhurst Park Limited | Hartfield | 2016 |
| Buckhurst Park Shoot Limited | Faversham | 2017 |
| Buckie & District Fishing Heritage Centre Ltd. | Buckie | 2000 |
| Buckie Thistle Development Limited | Buckie | 2014 |
| Bucking the Tiger, Ltd. | London | 2019 |
| Buckingham Dance Studios Ltd | Paignton | 2023 |
| Buckingham Golf Club Limited | Buckingham | 2014 |
| Buckingham Old Gaol Trust | Buckingham | 1985 |
| Buckinghamshire Conservation Trust | Towcester | 2008 |
| Buckinghamshire Golf Company Limited | Hounslow | 1989 |
| Buckinghamshire Rugby Referees Limited | Amersham | 2018 |
| Buckland Art Limited | Dorchester | 2001 |
| Buckland Athletic Football Club Limited | Cullompton | 2020 |
| Buckle Media Ltd | Stroud | 2026 |
| Buckled Records Limited | London | 2022 |
| Bucklers Hard Productions Ltd | Bromsgrove | 2019 |
| Buckley Creative Ltd | Manchester | 2025 |
| Buckley Cricket Club Ltd | Buckley | 2023 |
| Buckley Developments Ltd | Oldham | 2013 |
| Buckley Gymnastics Club Limited | Gwernaffield | 2015 |
| Buckley Movement & Memory Ltd | Bromley | 2026 |
| Buckley Stunt & Wireworks Ltd | Reading | 2019 |
| Buckminster Gliding Club Limited | Grantham | 1974 |
| Buckmore Park Karting Limited | Chatham | 2015 |
| Buckpace Limited | Chichester | 1987 |
| Bucks 5IVES Limited | Liverpool | 2010 |
| Bucks Academy of Music Ltd | London | 2021 |
| Bucks Academy of Sport & Exercise Ltd | Wendover | 2018 |
| Bucks Ballers Ltd | High Wycombe | 2025 |
| Bucks Community Boxing CIC | London | 2025 |
| Bucks Cricket Board Limited | Buckingham | 2010 |
| Bucks Futsal Club CIC | Milton Keynes | 2025 |
| Bucks Sport Academy Ltd | Wendover | 1997 |
| Bucks Tennis Limited | High Wycombe | 1992 |
| Bucks Trampoline & Tumbling Academy Ltd | Aylesbury | 2026 |
| Buckshee Productions Limited | Bolton | 2007 |
| BUD Studio Ltd | London | 2019 |
| Budden Consulting Ltd | Canterbury | 2021 |
| Buddhas & Wellness Limited | Bedlington | 2022 |
| Buddies Backyard Ltd | Brentwood | 2025 |