| Bumblebee Recycling Limited | London | 2022 |
| Bumbleboxx Ltd | Helston | 2023 |
| Bumbledore Ltd | Sedbergh | 2025 |
| Bumbles Delicatessen Ltd | Ballyclare | 2017 |
| Bumblezest Limited | London | 2016 |
| Bumco Ltd | Sleaford | 2025 |
| Bumi Move Ltd | London | 2025 |
| Bump & Breathe Ltd | London | 2026 |
| Bump Activewear Ltd | London | 2019 |
| Bump BPM Ltd | Warrington | 2023 |
| Bump Uglies Ltd | Croydon | 2025 |
| Bumper 2 Bumper Limited | Deal | 2016 |
| Bumperstops Ltd. | Bishop'S Stortford | 2000 |
| Bumpkeys Limited | Mansfield | 2024 |
| Bumpkin Organics Ltd | Bristol | 2020 |
| Bumpy's Customs Ltd | St. Austell | 2018 |
| Bumrah & Co Printing Ltd | London | 2025 |
| Bumzy’S Creative Cakes Ltd | Enfield | 2023 |
| BUN Voyage Limited | Oldham | 2016 |
| Bunadh UK Ltd | Newry | 2026 |
| Bunce (Ashbury) Limited | Swindon | 1971 |
| Bunce Sheet Metal Work Services Ltd | Egham | 2019 |
| Bunch London Ltd | Ilford | 2020 |
| Bundlebean Ltd | Swansea | 2009 |
| Bundles & Bites Ltd | Burntwood | 2024 |
| Bundoc Ltd | Crawley | 2006 |
| Bundu Brands Global Ltd | Bedford | 2022 |
| Bunel Services Limited | Coventry | 2011 |
| Bunergy Limited | London | 2023 |
| Bunfluff Ltd | Bury St. Edmunds | 2023 |
| Bungee Products Ltd | Blackpool | 2023 |
| Bungle Composites Ltd | Cambridge | 2016 |
| Bunji Limited | Warwick | 2020 |
| Bunk Bakery Ltd | London | 2025 |
| Bunka Group Ltd | Leeds | 2022 |
| Bunkall & Reynolds Interiors Ltd | Gravesend | 2021 |
| Bunker Storage Ltd | Chandlers Ford | 2023 |
| Bunko Limited | Swansea | 2010 |
| Bunks Limited | Hemel Hempstead | 2015 |
| Bunmi Ltd | London | 2014 |
| Bunny and MOO Ltd | Carmarthen | 2020 |
| Bunny Boba Ltd | London | 2025 |
| Bunny Engineering Limited | Sheffield | 2012 |
| Bunny Street Limited | Cannock | 2014 |
| Bunnyhog Games Limited | London | 2023 |
| Bunnytreats Limited | Barnet | 2025 |
| Buns Baked Goods Ltd | Manchester | 2024 |
| Buntar Aerospace Ltd | London | 2023 |
| Bunter & Shelley (Services) Limited | Liverpool | 1964 |
| Buntico Ltd | London | 2025 |
| Bunting Magnetics Europe Limited | Hertfordshire | 1964 |
| Bunting Tosser Limited | Worcester | 2016 |
| Buntingford Brewery Limited | Royston | 2017 |
| Buntingford Joinery Limited | Cheshunt | 2006 |
| Bunty Investments Ltd | Basingstoke | 2023 |
| Bunty Kitchens and Bedrooms Limited | Wokingham | 2021 |
| Bunyan & Bell Joiners Limited | Melrose | 2006 |
| Bunyard Electrical Solutions Ltd | Leamington Spa | 2019 |
| Bunzys Bakery Ltd | Dungannon | 2024 |
| Bunzz Ltd | Birmingham | 2024 |
| Buon Giorno Tutti Limited | Glasgow | 2013 |
| Buon Gustaio UNO Ltd | London | 2020 |
| Buono&Fresh Limited | Slough | 2025 |
| Buonomo & Stanley Ltd | London | 2023 |
| Buoyancy Aerospace V1 Ltd | Barnoldswick | 2002 |
| Buoyant Packaging Ltd | Betchworth | 2023 |
| Buoyant Upholstery Limited | Nelson | 1998 |
| Buoyant Works Ltd | Saltash | 2010 |
| Bupl Realisations Limited | Glasgow | 1999 |
| Burak Pastry Chef Ltd | London | 2020 |
| Burall Infosmart Limited | Hull | 1988 |
| Burano Limited | Harrow | 2023 |
| Buraq Blends Ltd | London | 2025 |
| Buraq Foods Limited | Birmingham | 2021 |
| Burbage Engineering & Construction Services Ltd | Yelverton | 2021 |
| Burbage Iron Craft Limited | Cannock | 1978 |
| Burbage Precision Limited | Burbage | 2005 |
| Burbeary Joinery Limited | Buxton | 1995 |
| Burbergo Ltd | Waltham Abbey | 2021 |
| Burberry Limited | London | 1920 |
| Burbidge & SON Limited | Coventry | 1942 |
| Burbidge Holdings Limited | Coventry | 2010 |
| Burbridge 2000 Limited | Braintree | 1990 |
| Burbridge Packaging (Louth) Limited | Louth | 2009 |
| Burbulinada Limited | London | 2025 |
| Burcas Limited | Newbury | 1947 |
| Burcea Ltd | Leicester | 2023 |
| Burch Design Ltd | Ilford | 2020 |
| Burch Trading Ltd | London | 2025 |
| Burckhardt Compression (UK) Limited | Bicester | 2000 |
| Burcombe Concrete Ltd | Estover | 2014 |
| Burden Bespoke Joinery Ltd | Blandford Forum | 2011 |
| Burdess Engineering Limited | Norfolk | 2006 |
| Burdett Optical Co.,Limited | London | 1945 |
| Bure Marine Equipment Ltd | Chichester | 2025 |
| Bure Marine Ltd | Chichester | 2025 |
| Bure Valley Railway (1991) Limited | Aylsham | 1991 |
| Bureau of Analysed Samples Limited | Huntingdon | 1935 |
| Burebista 2000 Ltd | Cambridge | 2025 |
| Burfield & Sons Ltd. | Seaford | 2016 |