| Base Tanning Limited | Bracknell | 2022 |
| Base Triangle Ltd | Liverpool | 2017 |
| Base UK Security Ltd | Glasgow | 2019 |
| Base Women's Housing CIC | Birmingham | 2015 |
| Basecomms Ltd | Birmingham | 2018 |
| Basecore Capital Limited | Tunbridge Wells, Kent | 2017 |
| Based at Base Ltd | Wrexham | 2024 |
| Basedbym Ltd | London | 2026 |
| Basehairandbeauty Ltd | Ashton-Under-Lyne | 2020 |
| Baseline Barbers Ltd | Gainsborough | 2026 |
| Baseline Projects Limited | Witney | 1995 |
| Basem Investments Ltd | London | 2019 |
| Basement 13 Tattoos Ltd | Aylesbury | 2017 |
| Basement Crowd Limited | London | 2014 |
| Basement Hairdressing Limited | Stoke-On-Trent | 2015 |
| Basement Holdings Ltd | Luton | 2017 |
| Basement Investments Ltd | Luton | 2011 |
| Basement Pump Servicing Limited | Cheam | 2006 |
| Basement Trims Ltd | Cardiff | 2026 |
| Basenineteen Ltd | Ashford | 2023 |
| Baseri Oxford Ltd | Twickenham | 2018 |
| Basetech Support Ltd | Oxford | 2024 |
| Basewellness Limited | Kettering | 2025 |
| Basfam Limited | Cranbrook | 2013 |
| Bash and Blow Ltd | Richmond | 2023 |
| Bash Style Barber Ltd | Rotherham | 2026 |
| Basha Cleaning Ltd | Corby | 2021 |
| Basher's Shop Ltd | Luton | 2025 |
| Bashika Beauty Ltd | Enfield | 2025 |
| Bashir Italian Hairdresser Limited | Burnley | 2025 |
| Bashir Romeo Toure Ventures UK Ltd | Thornton Heath | 2024 |
| Bashir Tailoring Services Limited | Beckenham | 2020 |
| Bashir&Sons Ltd | Edinburgh | 2025 |
| BASHIR233 Limited | Dumfries | 2025 |
| Bashon Barber Ltd | Stroud | 2026 |
| Bashs Barbers Ltd | Atherstone | 2025 |
| Basi Consulting Ltd | London | 2020 |
| Basic Beauty Limited | Wembley | 2017 |
| Basic Black Vision Ltd | Bristol | 2023 |
| Basic Gym Limited | London | 2023 |
| Basic Gym Nottingham Limited | London | 2025 |
| Basicsbybtm Services Ltd | London | 2025 |
| Basictypos Ltd | West Stonesdale | 2018 |
| Basildon Business Leaders CIC | Billericay | 2024 |
| Basildon Eastgate Shopmobility | Canvey Island | 1990 |
| Basildon Garden & Mower Centre Ltd | Billericay | 2020 |
| Basildon Makas Ltd | Basildon | 2024 |
| Basildon, Billericay and Wickford Council for Voluntary Service | Basildon | 2012 |
| Basim Distribuation Ltd | Romford | 2018 |
| Basing DRY Clean Ltd | Basingstoke | 2019 |
| Basing Tech Ltd | Basingstoke | 2025 |
| Basingstoke & District Model Engineering Society Limited | Basingstoke | 2014 |
| Basingstoke Barbers Limited | Eastleigh | 2018 |
| Basingstoke Community Churches | Basingstoke | 1997 |
| Basingstoke Express Car Ltd | Basingstoke | 2024 |
| Basingstoke HCW Ltd | Harrow | 2012 |
| Basingstoke Ice Blasting Ltd | London | 2024 |
| Basingstoke Irish Society | Basingstoke | 2005 |
| Basingstoke Makerspace | Basingstoke | 2017 |
| Basinique Ltd | Basildon | 2025 |
| Basis Ramps Limited | Ashbourne | 2012 |
| Basis Registration Limited | Ashbourne | 1978 |
| Basis Trades Ltd | Plymouth | 2015 |
| Basit Blends Limited | Bolton | 2026 |
| Bask in Beauty Ltd | Bolton | 2026 |
| Bask Saunas Ltd | Paisley | 2025 |
| Bask TAN Ltd | Newcastle | 2023 |
| Basked Tanning Limited | Watchfield | 2024 |
| Baskerville Wharf (Birmingham) Limited | Stratford-Upon-Avon | 2017 |
| Baskerville Worldwide Ventures Ltd | Southampton | 2006 |
| Basketballscotland Limited | Edinburgh | 2005 |
| Baskey Music Limited | London | 2025 |
| Basma Appeal Ltd | London | 2025 |
| Basmint Investment Limited | London | 2020 |
| Baso ~ the Association for Cancer Surgery | London | 2010 |
| Basp Ltd. | Lincoln | 2001 |
| Basque Society - Euskal Elkartea | London | 1999 |
| Basrah Lounge Ltd | Ilford | 2018 |
| Bass Beatz Productions Ltd | Torquay | 2020 |
| Bass Beauty Limited | St. Leonards-On-Sea | 2010 |
| Bass Enterprise Ltd | Shepperton | 2023 |
| Bass Services Limited | Manchester | 2023 |
| Bassan Solutions Limited | Ascot | 2014 |
| Bassarabica Limited | Pinner | 2013 |
| Bassboy Ltd | Bristol | 2021 |
| Basset Rescue Network GB | Caterham | 2014 |
| Bassetlaw Community and Voluntary Service | Worksop | 2010 |
| Bassett Installations of Calne Ltd | Calne | 2011 |
| Basshol Building Services Ltd | Stockton On Tees | 2020 |
| Bassi 1973 Limited | Harrow, | 2012 |
| Bassi Beauty Limited | Derby | 2025 |
| Bassi Build Ltd | London | 2015 |
| Bassi Business Ltd | London | 2025 |
| Bassi Capital Limited | Birmingham | 2018 |
| Bassini Beauty Nails and Pedicure Shops Limited | Harrow | 2026 |
| Bassini DRY Cleaners Limited | Harrow | 2026 |
| Bassini Spas Limited | Harrow | 2022 |
| Basstan Trading Limited | London | 2005 |
| Bassu Limited | Morpeth | 2013 |
| Basta (Shetland) Ltd | Lerwick | 2019 |