| Butterflies Rising Ltd | Liverpool | 2023 |
| Butterfly & Wolf Limited | Gerrards Cross | 2024 |
| Butterfly Allure Ltd | Walsall | 2024 |
| Butterfly and the Wolf Salons Ltd | Greenock | 2022 |
| Butterfly Beautique Limited | Oswestry | 2017 |
| Butterfly Beauty (Ribble Valley) Ltd | Preston | 2023 |
| Butterfly Beauty at Holly’S Ltd | Bala | 2020 |
| Butterfly Beauty Limited | Nottingham | 2025 |
| Butterfly City Community Interest Company | Hull | 2026 |
| Butterfly Effect Beauty Ltd | Manchester | 2024 |
| Butterfly Effect London Ltd | High Wycombe | 2004 |
| Butterfly Effects (Gallery) Limited | Nottingham | 2018 |
| Butterfly Foundation Community Interest Company | London | 2024 |
| Butterfly Funeral Services Ltd | Melton Mowbray | 2020 |
| Butterfly Funerals Limited | Luton | 2014 |
| Butterfly Hair Salon Limited | Brentwood | 2014 |
| Butterfly Hair Trading AS the Hair Boutique Ltd | Northwood | 2020 |
| Butterfly Investments (UK) Limited | London | 2004 |
| Butterfly Investments Limited | London | 2007 |
| Butterfly Ireland Limited | Newtownards | 2023 |
| Butterfly Kisses Consulting UK Limited | Cheadle | 2025 |
| Butterfly Lexi Limited | Newcastle Upon Tyne | 2019 |
| Butterfly Mediation Ltd | London | 2025 |
| Butterfly Motive Ltd | Pershore | 2024 |
| Butterfly Nails & Aesthetics Ltd | Bournemouth | 2025 |
| Butterfly Picture Frame Ltd | Ilford | 2018 |
| Butterfly Rose Ltd | Otley | 2019 |
| Butterfly Salon Limited | Congleton | 2014 |
| Butterfly Therapies Limited | Cottingham | 2019 |
| Butterfly Wings of Freedom Limited | Evesham | 2018 |
| Butterfly Yoga Ltd | Bathgate | 2022 |
| Butterfly YOU Beauty Ltd | Pevensey | 2024 |
| Butterlope Farm CIC | Omagh | 2015 |
| Butterluxe Limited | Manchester Road | 2016 |
| Buttermarket Barbers Ltd | Suffolk | 2020 |
| Buttermere Holdco Limited | London | 2024 |
| Butternut Bikes Ltd | London | 2020 |
| Butterstile Cleaning Ltd | Manchester | 2021 |
| Butterton Cross Farm Limited | Bakewell | 2016 |
| Button & Family Funeral Services Limited | Sheerness | 2021 |
| Button & Lace Centre Ltd | Birmingham | 2020 |
| Buttonenergy Limited | Newcastle Upon Tyne | 2003 |
| Buttons Studio Ltd | London | 2015 |
| Butts Signature Cutz Limited | Walsall | 2025 |
| Buvette Ambition Consultant Limited | Manchester | 2026 |
| Buwt Ltd | London | 2023 |
| Buxel 186 Ltd | London | 2014 |
| Buxted Bonfire Society Limited | Brighton | 2018 |
| Buxted Chicken Limited | Wakefield | 1995 |
| Buxton and District Land Rover Club Limited | Buxton | 2006 |
| Buxton BEE Hive Limited | Buxton | 2023 |
| Buxton Business Club Ltd | Buxton | 2025 |
| Buxton Church in the Peak | Buxton | 2008 |
| Buxton Dairy Milk Retailing Limited | Whaley Bridge | 2012 |
| Buxton Heating Ltd | Bordon | 2009 |
| Buxton Masonic Hall Limited | Buxton | 2018 |
| Buxton Models Limited | Waltham Abbey | 2022 |
| Buxton Services Limited | Great Yarmouth | 2016 |
| Buxton Town Team C.I.C. | Buxton | 2012 |
| Buxton V.E. Limited | Nottingham | 2008 |
| Buy & Save (GB) Ltd. | Durham | 2018 |
| Buy and OUT Ltd | Hounslow | 2023 |
| Buy British Campaign Limited | Bolton | 2016 |
| Buy Designs E17 Limited | London | 2018 |
| Buy for List Ltd | Highbridge | 2024 |
| Buy IT ANY Time Ltd | Wickford | 2019 |
| Buy IT Ltd | Haslemere | 2009 |
| Buy Local Norfolk | Norwich | 2007 |
| Buy PAY International Ltd | Manchester | 2026 |
| Buy With Confidence Ltd | Exeter | 2012 |
| Buyaparcel Trustee Limited | Lowestoft | 2024 |
| Buyeasy Ltd | Dagenham | 2024 |
| Buyers Hub Ltd | Falkirk | 2020 |
| Buyframe & Co Ltd | London | 2023 |
| Buyit Investments Limited | London | 2023 |
| Buyline Signatures Limited | Formby | 2021 |
| Buylixo Limited | Heckmondwike | 2026 |
| Buyloop Ltd | London | 2025 |
| Buymoors Limited | Oldham | 1993 |
| Buymorecar.Co.Uk Limited | Maidstone | 2009 |
| Buypay Services Ltd | London | 2023 |
| Buyquick Ltd | Huddersfield | 2026 |
| Buysellswing Ltd | Swindon | 2025 |
| Buzby & Blue Limited | Chichester | 2004 |
| Buzby and Blue Academy Limited | Chichester | 2014 |
| Buzby Limited | Liverpool | 2014 |
| Buzitech Ltd | Haverfordwest | 2007 |
| Buzy Bees (Parties) Ltd | Snodland | 2016 |
| Buzz and Fade Ltd | Bognor Regis | 2024 |
| Buzz Bees Ltd | London | 2017 |
| Buzz Bexhill Limited | Polegate | 2008 |
| Buzz Club City Ltd | Leeds | 2023 |
| Buzz Contractors Ltd | Birmingham | 2018 |
| Buzz Cutz Dog Grooming Ltd | High Wycombe | 2024 |
| Buzz Graphic Design Limited | Banbury | 2004 |
| Buzz GRC Consulting Limited | Reading | 2018 |
| Buzz Hair Therapy Islington Ltd | London | 2022 |
| Buzz Haircut Ltd | Stockport | 2025 |
| Buzz Merchants Limited | | 2001 |
| Buzz Repairs Ltd | Edinburgh | 2024 |