| Books & Catalogues Ltd | Rotherham | 2014 |
| Books Factory Ltd | Hyde | 2023 |
| Books Line Ltd | Poole | 2020 |
| Books Supplier Ltd | Reading | 2026 |
| Booksbymetre Limited | Rochford | 2014 |
| Bookshelf Merchandisers Limited | London | 1989 |
| Bools & Co Limited | Doncaster | 2024 |
| Boom Access Services Limited | Mayland | 2015 |
| Boom Boom Foods Ltd | London | 2020 |
| Boom Labs Ltd | London | 2023 |
| Boom Machinery Inspections Limited | Rushden | 2018 |
| Boom Marketing Limited | Mirfield | 2013 |
| Boom Z Limited | Newtownards | 2024 |
| Boom-Time Ltd | Dorking | 2019 |
| Boombé Ltd | London | 2025 |
| Boomer Industries Limited | Lisburn | 1970 |
| Boomerang Recycling Limited | Menai Bridge | 2015 |
| Boomerang Resources Limited | Taunton | 2015 |
| Boomerang Welding Services Ltd | Stockton-On-Tees | 2025 |
| Boomerang Woodworking CIC | Glasgow | 2023 |
| Boomfa Ltd | Exmouth | 2023 |
| Boomhug Limited | Leicester | 2025 |
| Boompods Limited | Saffron Walden | 2012 |
| Boomsessfit Ltd | South Croydon | 2019 |
| Boomslang Backpacks Ltd | London | 2026 |
| Boon & Lane Limited | Bedfordshire | 1966 |
| Boon Boat Ltd | London | 2024 |
| Boon Food Ltd | London | 2026 |
| Boona Boona Coffee Roasters Limited | Bristol | 2019 |
| Boons on Plate Ltd | Ipswich | 2024 |
| Boontown Coffee Limited | London | 2018 |
| Booost Trading Limited | London | 2001 |
| Boopaper Ltd | Bristol | 2024 |
| Booply Ltd | London | 2026 |
| Boosel Ltd | London | 2014 |
| Boosh Global Limited | Romford | 2019 |
| Boost Bar Ltd | Stanmore | 2024 |
| Boost Bikes Limited | Newry | 2013 |
| Boost Hair Limited | London | 2017 |
| Boost Innovations Limited | Calstock | 2018 |
| Boost Print & Display Ltd | Tamworth | 2021 |
| Boosta Ltd | Gravesend | 2026 |
| Boosted Weave Ltd | Gravesend | 2025 |
| Boosttraders Ltd | Glasgow | 2025 |
| Boostworks Engineering Ltd | Ilford | 2025 |
| Boot & Associates Limited | Carterton | 2010 |
| Boot Bananas Ltd | Poole | 2012 |
| Boot Buddy Ltd | Stourport | 2006 |
| Boot Technologies Ltd | Amersham | 2015 |
| Boot Town Brewery Ltd | Burton Latimer | 2018 |
| Bootec Ltd | Ammanford | 2003 |
| Booth & SON Limited | Swindon | 2005 |
| Booth & Starkiss Ltd | Sheffield | 2025 |
| Booth Air Conditioning (Service) Ltd | Rochdale | 2008 |
| Booth Apex Munitions Ltd | High Wycombe | 2025 |
| Booth Bros. Printing Limited | Sheffield | 1988 |
| Booth Brothers Feedstock Limited | Huddersfield | 2017 |
| Booth Dispensers Limited | Blackpool | 1999 |
| Booth Heating Solutions Limited | Bolton | 2006 |
| Booth Industries International Limited | Chatteris | 2021 |
| Booth Limited | Southampton | 1973 |
| Booth Medics Ltd | Strathaven | 2021 |
| Booth Offshore Services Limited | Stockport | 2021 |
| Booth Seating Ltd | Bolton | 2024 |
| Booth Station Ltd | Mansfield | 2025 |
| Booth Ventilating Limited | Middlesex | 1951 |
| Booth's Welding Ltd | St Leonards On Sea | 2023 |
| Boothby Engineering Limited | Nuneaton | 2010 |
| Booths Garden Studios Limited | Corby | 2010 |
| Booths Riversway Limited | Preston | 1949 |
| Booths Stonemasonry & Masonry Conservation Ltd | Lincoln | 2023 |
| Boothtec Engineering Limited | Kilmalcolm | 2005 |
| Boothtec Service & Maintenance Ltd | Airdrie | 2022 |
| Boothtown Brewery Co Ltd | Pontefract | 2016 |
| Booth’S Bakery Ltd | Swansea | 2019 |
| Bootkidz Limited | London | 2008 |
| BOOTL3G Ltd. | London | 2016 |
| Bootle Containers Limited | Widnes | 1977 |
| Bootle Glass Company Limited | Merseyside | 2003 |
| Bootle Intermodal Ltd | Bootle | 2015 |
| Bootproof Ltd | St. Albans | 2024 |
| Boots 'N' Blades Limited | Woodbridge | 2015 |
| Boots N Pieces Ltd | Tranent | 2022 |
| Bootscoota Limited | Cannock | 2016 |
| Bootsy Couture Ltd | Kington | 2024 |
| Bootyman Printers Limited | Hull | 1992 |
| Booxpert Publishing Ltd | London | 2024 |
| Booyah Vitality Trading Limited | Hastings | 2021 |
| Booze, Burn and Bloom Ltd | Salford | 2018 |
| Boozy Bakers Ltd | Waterlooville | 2018 |
| Boozy Baubles Limited | Edinburgh | 2017 |
| Boozy Bods Ltd | Abertillery | 2012 |
| BOP Europe Ltd | Grantham | 2007 |
| Boparai Engineering Ltd | Bridgend | 2024 |
| Boparan Foods Limited | Wakefield | 1996 |
| Bophonysse Limited | Wembley | 2020 |
| Boplog Ltd | Edinburgh | 2025 |
| Bopsocialmedia Limited | Felixstowe | 2024 |
| Bopworx Limited | Enniskillen | 2011 |
| Boqnov Composites Ltd | Cambridge | 2025 |