| Buttery Cravings Ltd | Birmingham | 2026 |
| Butticè Organization Limited | Bedford | 2019 |
| Buttinghill Wines Limited | London | 2021 |
| Buttner Engineering Ltd | Grays | 2016 |
| Button and Bean Limited | Thames Ditton | 2011 |
| Button Engineering Limited | King'S Lynn | 2011 |
| Button Eray Limited | Bristol | 2024 |
| Button Nose Bakery Ltd | Hove | 2025 |
| Button Stance UK Ltd | Aberdeen | 2017 |
| Button's Joinery Limited | Leeds | 2009 |
| Buttoned Furniture Ltd | Newtownabbey | 2021 |
| Buttonswood Limited | Scunthorpe | 2009 |
| Butty Bach Ltd | Barry | 2018 |
| Buttys Bakery Ltd | Caerphilly | 2026 |
| Buttys Bits Limited | Eastbourne | 2015 |
| Butyl Products Limited | Essex | 1995 |
| Buucha Ltd | London | 2023 |
| Buuckles Ltd | Havant | 2018 |
| BUX Clothing Limited | Leicester | 2008 |
| Buxoplas Manufacturing Limited | Hope Valley | 2014 |
| Buxoplas Pipe Systems Limited | Hope Valley | 2011 |
| Buxted Bike Workshop Ltd | Uckfield | 2022 |
| Buxton Brewery Limited | Bolton | 2017 |
| Buxton Building Supplies Limited | Derbyshire | 1998 |
| Buxton Distillery Limited | Buxton | 2014 |
| Buxton Light Engineering Limited | Buxton | 2008 |
| Buxton Lime Limited | Buxton | 2022 |
| Buxton Medical and Educational Services Limited | Liverpool | 2020 |
| Buxton Pies Limited | Bristol | 2017 |
| Buxton Press Limited | Derbyshire | 1960 |
| Buxton Tyres Ltd | Edinburgh Midlothian | 2025 |
| Buxton Violin Shop Limited | Bexhill On Sea | 1998 |
| Buxum (UK) Limited | Okehampton | 2015 |
| Buy a Press Ltd | 145 Granville Street | 2024 |
| Buy and Build House Ltd | Kingston Upon Thames | 2011 |
| Buy BUX PVT Ltd | West Bromwich | 2021 |
| Buy From Sweden Limited | London | 2020 |
| Buy Tech Ltd | London | 2014 |
| Buy the Same Token Ltd | Hove | 2018 |
| Buy Wise Supplies Ltd | Sevenoaks | 2024 |
| Buybuy Brought Limited | London | 2021 |
| Buymultimart Ltd | Ruislip | 2024 |
| Buyprint.Today Ltd | Birmingham | 2023 |
| Buyrite Enterprises Limited | Coalville | 2014 |
| Buysellestate Ltd | Slough | 2020 |
| Buywindowsonline.Co.Uk Ltd | Walsall | 2011 |
| BUZ Electrics Ltd Ltd | Nottingham | 2026 |
| Buzlen Limited | Altrincham | 2019 |
| Buzo Nexa Ltd | Swindon | 2026 |
| Buzz Conversions Ltd | Ramsgate | 2025 |
| Buzz Electrical Solutions Limited | Wallington | 2016 |
| Buzz Electronics Limited | Polegate | 2010 |
| Buzz Engineering Limited | Sheffield | 2019 |
| Buzz FAB Solutions Ltd | Ballygawley | 2023 |
| Buzz in Cleaning Ltd | Manchester | 2026 |
| Buzz Into Beekeeping Limited | Chelmsford | 2025 |
| Buzz Marketing Limited | Ruislip | 2000 |
| Buzz Physique Apparel Limited | Plymouth | 2019 |
| Buzz Production Limited | Dorking | 2007 |
| Buzz Spark Devices Ltd | Edgware | 2023 |
| Buzz Wireless Networks Limited | Doncaster | 2020 |
| Buzzard Cameras Limited | Alcester | 2016 |
| Buzzards Apparel Limited | Tadley | 2017 |
| Buzzbalm Limited | Stockport | 2016 |
| Buzzed Beans Ltd | London | 2026 |
| Buzzes Cookies Ltd | London | 2025 |
| Buzzfanz Ltd | London | 2026 |
| Buzzfix Ltd | Hounslow | 2025 |
| Buzzing Bugs Audio Devices Ltd | Truro | 2022 |
| Buzzing Crystal Ltd | Kingston Upon Thames | 2025 |
| Buzzing World Limited | Park Farm Hotel, Norwich Road | 2023 |
| Buzzlewick Gifts Ltd | Torrington | 2025 |
| Buzzoni Ltd | Bury St. Edmunds | 2021 |
| Buzztek Ltd | Stockport | 2020 |
| Buzztracks Ltd | Hove | 2022 |
| Buzzweld Ltd | Bristol | 2022 |
| Buzzwind Ltd | Bridlington | 2025 |
| BV Apiary Equipment Limited | Downpatrick | 2025 |
| BV Construction & Demolition UK Limited | Cardiff | 2022 |
| BV Diamond Products Limited | Batley | 2007 |
| BV Fabrications Limited | Boston | 2012 |
| BV PPT Holdings Ltd. | Halifax | 2014 |
| BV Shutters & Shop Fronts Services Limited | Sheffield | 2023 |
| BV Siltint Ltd | St. Andrews | 2023 |
| BV Sky Ltd | Cambridge | 2026 |
| BV Textiles & Castaway Ltd | Coalville | 2015 |
| BV Tiling Ltd | Northampton | 2022 |
| BVB International Ltd | Swaffham | 2019 |
| Bvca Ltd | Bristol | 2018 |
| BVD Darts Limited | Newtownabbey | 2022 |
| Bvil Ltd | Bromley | 2023 |
| BVK 2020 Ltd | London | 2020 |
| BVL Catering Repairs Limited | Cardiff | 2021 |
| BVM Medical Limited | Hinckley | 1989 |
| BVM Systems Limited | London | 2009 |
| BVT Labs Ltd | Leicester | 2024 |
| BW Agricultural Services Ltd | Aldermaston | 2021 |
| BW and DJ Glaves & Sons Limited | Scarborough | 2003 |
| BW Broadcast FM Limited | London | 2024 |
| BW Broadcast Limited | Croydon | 2003 |