| Barworx Limited | Enfield | 2024 |
| BAS Arts Index CIC | Wickford | 2023 |
| BAS Music Limited | Bromley | 2010 |
| BAS Studios Ltd | Broughty Ferry | 2024 |
| BAS Training Ltd | Norwich | 2019 |
| Bas:X Art Community Interest Company | Selkirk | 2020 |
| Baschurch Tennis Club Ltd | Baschurch | 2024 |
| Basclub.Co.Uk Ltd | Kingston Upon Thames | 2026 |
| Base 10 Events Ltd | Mansfield | 2022 |
| Base 13 Coaching Academy Limited | London | 2025 |
| Base 13 Fitness Ltd | Eastdown Park | 2022 |
| Base Artist Studios Ltd | Lincoln | 2026 |
| Base Athletic Limited | London | 2026 |
| Base BLU Training Club Ltd | Swansea | 2026 |
| Base Body Fitness Limited | Stoke On Trent | 2002 |
| Base Empire Ltd | Greenford | 2018 |
| Base Event Structures Limited | Burton-On-Trent | 2022 |
| Base Fit Gym Ltd | Wakefield | 2025 |
| Base Fit Ltd | Glasgow | 2018 |
| Base Fitness Training Ltd | Stirling | 2023 |
| Base Gym Limited | Bristol | 2025 |
| Base Jump (London) Ltd | London | 2015 |
| Base Movement Limited | Poole | 2023 |
| Base Nights Ltd | London | 2024 |
| Base One Europe Beech Hill Limited | Londonderry | 2010 |
| Base Performance Ltd | Birmingham | 2025 |
| Base Pilates Ltd | Marlow | 2020 |
| Base Powerlifting Club Ltd | Hinckley | 2026 |
| Base PT Limited | Grimsby | 2019 |
| Base Recovery Limited | Edinburgh | 2025 |
| Base S & C Ltd | Paisley | 2024 |
| Base Soccer East Europe Limited | London | 2016 |
| Base Soccer Europe Limited | London | 2015 |
| Base Soccer Italy Limited | London | 2017 |
| Base Strength and Conditioning Limited | Windsor | 2020 |
| Base Strength and Fitness Ltd | Cardiff | 2020 |
| Base Training Club Ltd | Hinckley | 2025 |
| Base Training Glasgow Ltd | Glasgow | 2026 |
| Base World Ltd | London | 2025 |
| Baseballsoftballuk Limited | Farnham Royal | 2007 |
| Basebid Limited | Cardiff | 2012 |
| Basebox London Limited | Ruislip Gardens | 2017 |
| Basecamp Endurance Ltd | Waltham Cross | 2026 |
| BASECAMP2.0 Ltd | Havant | 2025 |
| Basecgi Limited | Exeter | 2014 |
| Basedac Limited | London | 2017 |
| Basefit Personal Training Limited | Stoke-On-Trent | 2021 |
| Basefit Training Biddulph Ltd | Stoke-On-Trent | 2014 |
| Basehq Limited | Newcastle | 2002 |
| Baselab CIC | Nottingham | 2024 |
| Baseless Fabric Theatre Ltd | London | 2014 |
| Baseline Edge Ltd | Walton-On-Thames | 2025 |
| Baseline JIU Jitsu Limited | Irvine | 2023 |
| Baseline Padel Ltd | London | 2025 |
| Baseload Limited | London | 2024 |
| Basemagazine Limited | Chipping Norton | 2010 |
| Basement 94 Limited | London | 2016 |
| Basement Collective Ltd | London | 2025 |
| Basement Hire Ltd | Wimborne | 2018 |
| Basement Management Ltd | Burnley | 2025 |
| Basementartsproject CIC | Leeds | 2022 |
| Basford United Community Football Club CIC | Nottingham | 2015 |
| Basford United Football Club Limited | Nottingham | 1981 |
| Bash & Smash Body Fitness Limited | Leeds | 2017 |
| Bash Base Ltd | Pontefract | 2025 |
| Bash Buddies Limited | Maldon | 2002 |
| Bash Parties & Events Ltd | Blackpool | 2019 |
| Bash Quiz Ltd | London | 2024 |
| Bash Stunts Ltd | Bristol | 2021 |
| Bashan & Cotton Limited | Sandown | 2018 |
| Basharatyan V Limited | London | 2011 |
| Basher Watts Racing Club Ltd | Nottingham | 2024 |
| Basher Watts Racing National Hunt Syndicates 2 Limited | Nottingham | 2025 |
| Basher Watts Racing Syndicates 2 Ltd | Nottingham | 2024 |
| Basher Watts Racing Syndicates 3 Ltd | Nottingham | 2024 |
| Basher Watts Racing Syndicates 4 Ltd | Nottingham | 2025 |
| Basher Watts Racing Syndicates 5 Ltd | Nottingham | 2025 |
| Basher Watts Racing Syndicates 7 Limited | Norwich | 2025 |
| Basher Watts Racing Syndicates 8 Ltd | Nottingham | 2025 |
| Basher Watts Racing Syndicates Ltd | Nottingham | 2024 |
| Bashir AA & Sons Ltd | Bristol | 2017 |
| Bashley Football Club Limited | London | 2026 |
| Basho Music Limited | | 2003 |
| Basibooboo Ltd | Coventry | 2008 |
| Basic Ball Group Ltd | Barking | 2024 |
| Basic Sports & Fitness (BSF) Limited | London | 2010 |
| Basically Cheer CIC | Burnley | 2024 |
| Basics Junior Theatre School Ltd | Burnley | 2025 |
| Basildon Golf Course Limited | Tenterden | 2013 |
| Basildon Sport & Leisure Club | Basildon | 2014 |
| Basildon Sporting Village Limited | Hinckley | 2009 |
| Basildon United Football, Sports & Leisure Limited | Billericay | 2025 |
| Basildon UTD Football Club Ltd | Billericay | 2023 |
| Basingstoke & Deane Community Leisure Trust | Road Basingstoke | 2005 |
| Basingstoke & Midhants Athletic Club | Hook | 2022 |
| Basingstoke and Deane Canoe Club | Basingstoke | 2012 |
| Basingstoke and District Sports Trust Limited (the) | Hampshire | 1970 |
| Basingstoke Bison Hockey Ltd | Swindon | 2025 |
| Basingstoke Bison Ice Hockey Academy Limited | Basingstoke | 2025 |
| Basingstoke Boxing Classes Ltd | Basingstoke | 2025 |