| B2M Technology Limited | Chesterfield | 2014 |
| B2TWIN Ltd | Croydon | 2025 |
| B2X Care Solutions Ltd | London | 2012 |
| B3 Apparel Ltd | Reading | 2024 |
| B3 Blasting & Coating Ltd | Hayes | 2024 |
| B3 Cricket (International) Limited | Nottingham | 2014 |
| B3 Haberdashery Limited | Bradford | 2024 |
| B3 Industries Ltd | Preston | 2025 |
| B3 Supplements Limited | Manchester | 2019 |
| B333GETP Ltd | Northampton | 2026 |
| B3D Creative Ltd | Horsham | 2019 |
| B3SA Ltd | Halifax | 2017 |
| B4E Limited | St. Austell | 2017 |
| B6 (UK) Ltd | Reading | 2005 |
| B7 NE Ltd | Cramlington | 2024 |
| B70 Composites Ltd | Manchester | 2022 |
| B70COL Ltd | South Shields | 2019 |
| B737 Enginering Limited | Manchester | 2021 |
| B7ACTIVE Ltd | London | 2020 |
| B8 Kitchens and Bedrooms Ltd | Middlesbrough | 2020 |
| BA Aero Ltd | Newtownards | 2016 |
| BA Bolts Limited | Cheltenham | 2013 |
| BA Carpentry Ltd | Leeds | 2021 |
| BA Clic Components Ltd | Cookstown | 2016 |
| BA Electrical (London) Ltd | London | 2018 |
| BA Electrics Limited | Beckenham | 2023 |
| BA Fabrications Services Limited | Ashton-Under-Lyne | 2014 |
| BA International Foods Ltd | Reading | 2025 |
| BA Kitchen Components Ltd | Co. Tyrone | 1994 |
| BA Machine Ltd | Hailsham | 2022 |
| BA Machining Limited | Leamington Spa | 2015 |
| BA Mobile Fleet Services Limited | Solihull | 2012 |
| BA Polymer Limited | Blackburn | 2017 |
| BA Suppliers Ltd | Birmingham | 2024 |
| BAA Baby Ltd | Newark | 2018 |
| BAA Engineering Ltd | Burntwood | 2013 |
| BAA Services Limited | Sheffield | 2006 |
| BAA Tooling Limited | York | 2006 |
| Baabah Ltd | Brighton | 2026 |
| Baader (U.K.) Limited | Rugby | 1975 |
| Baaft Limited | Stockport | 2025 |
| Baaj Steel Fabrications Ltd | Southall | 2024 |
| Baana Workwear Ltd | Birmingham | 2024 |
| Baani Apparels Ltd | Cardiff | 2025 |
| Baani's Ceramic World Ltd | High Wycombe | 2024 |
| Baap Limited | Leicester | 2005 |
| BAB Maintenance Ltd | London | 2026 |
| Baba ALI Ltd | Birmingham | 2012 |
| Baba Corporation Ltd | Southampton | 2009 |
| Baba Farid International Ltd | Bristol | 2026 |
| Baba Innovations Ltd | Huddersfield | 2026 |
| Baba Roga Ltd | Cheltenham | 2021 |
| Baba Windows Ltd | London | 2025 |
| Baba-Yaga Balkan Food Ltd | Oswestry | 2026 |
| Bababing Limited | Keighley | 2005 |
| Bababoo Furniture Ltd | Poulton-Le-Fylde | 2018 |
| Babaca Ltd | Manchester | 2025 |
| Babacik Ltd | London | 2018 |
| Babadosa Ltd | Harrow | 2024 |
| Babai Carp Limited | London | 2025 |
| Babaluma Music Limited | Rickmansworth | 2022 |
| Baban Naan Ltd | London | 2025 |
| Babans NAN Ltd | London | 2021 |
| Babas Sauce Ltd | Dundee | 2021 |
| Babayka Customs Ltd | London | 2019 |
| Babber Jewellers Limited | Birmingham | 2016 |
| Babbinswood Organic Farm Ltd | Oswestry | 2021 |
| Babblebib Limited | Meridian Business Park | 2011 |
| Babblebook Ltd | Glasgow | 2025 |
| Babcock Energy Limited | Crawley | 1974 |
| Babcock Marine (Rosyth) Limited | Dunfermline | 2007 |
| Babcock Marine Products Limited | London | 1998 |
| Babcock Marine Shipbuilding Limited | London | 2022 |
| Babcock Vehicle Engineering Limited | London | 1947 |
| Babcock Wanson UK Limited | Herts | 1956 |
| Babcock Welding Products Limited | | 1907 |
| Babcure Ltd | Cardiff | 2021 |
| Babe Clothing Ltd | Leicester | 2013 |
| Babease Foods Limited | London | 2019 |
| Babeease Ltd | Reigate | 2025 |
| Babef Ltd | Bradford | 2019 |
| Babeguy Ltd | Manchester | 2025 |
| Babek International Ltd | Bishop Auckland | 2023 |
| Babel Enterprises Limited | Wellington | 2024 |
| Babel Gift Ltd | Twickenham | 2018 |
| Babelfish Media Limited | Stroud | 2025 |
| Babelle Ltd | London | 2014 |
| Babes That Budget Shop Ltd | Walkden | 2023 |
| Babetropic Ltd | London | 2025 |
| Babetta Marianne Limited | Newcastle | 2021 |
| Babette Wasserman Ltd | | 2002 |
| Babi BW Ltd | Caldicot | 2014 |
| Babi Plastic Ltd | Ilkeston | 2024 |
| Babiesdecor Ltd | Bradford | 2024 |
| Babiesmiles Ltd | London | 2024 |
| Babiiss Ltd | Cambridge | 2025 |
| Babin London Ltd | Plymouth | 2022 |
| Babka Babes Ltd | London | 2024 |
| Babka Ltd | Oxford | 2018 |
| Bablades Ltd | Sandown | 2023 |