| Build Metrics Ltd | Professional & scientific | 2025 |
| Build on Engineers Limited | Professional & scientific | 2019 |
| Build to Connect Ltd | Information & communication | 2026 |
| Buildable AI Limited | Information & communication | 2025 |
| Builders Store Limited | Manufacturing | 1971 |
| Builders Team Ltd | Construction | 2018 |
| Builders' Talk Group Limited | Information & communication | 2017 |
| Buildforce Group CIC | Administrative & support | 2020 |
| Building & Property Management Solutions Limited | Construction | 2014 |
| Building Control Drawings Ltd | Information & communication | 2009 |
| Building Information Modelling (Yorkshire) Limited | Professional & scientific | 2014 |
| Building Interiors Holdings Limited | Financial services | 2016 |
| Building Interiors Limited | Construction | 2010 |
| Building Interiors Properties Ltd | Real estate | 2015 |
| Building Materials Yorkshire Limited | Wholesale & retail | 2021 |
| Building Pixels Ltd | Administrative & support | 2025 |
| Building Possibilities Ltd | Real estate | 2025 |
| Building Services & Independent Advisory Health & Safety Consultants Ltd | Professional & scientific | 2019 |
| Building Site Developments Limited | Construction | 2005 |
| Building Wealth World Ltd | Wholesale & retail | 2024 |
| Buildstream Limited | Administrative & support | 2018 |
| Buildtrue (2008) Limited | Other services | 2008 |
| Built an Estimate Ltd | Professional & scientific | 2026 |
| Built Digital Engineering Ltd | Information & communication | 2023 |
| BUILT4U Developments Ltd | Construction | 2018 |
| Builttrix Limited | Construction | 2025 |
| Bujakowski Group Ltd | Wholesale & retail | 2018 |
| Bulawayo Aesthetics UK (PVT) T/A N Moyo Consulting and Facilities Management Ltd | Manufacturing | 2025 |
| Buldak Ltd | Hospitality | 2024 |
| Bulgarian School Leeds Ltd | Education | 2016 |
| Bulgartel Limited | Wholesale & retail | 2016 |
| Bulk Haulage (Leeds) Limited | Real estate | 1982 |
| Bulk Storage Leeds Limited | Real estate | 2015 |
| Bull and DOC Clothing Ltd | Wholesale & retail | 2025 |
| Bull Medical Services Ltd | Health & social care | 2022 |
| Bulldog Commercial Property Ltd | Real estate | 2020 |
| Bulldog Properties (Yorkshire) Ltd | Real estate | 2017 |
| Bullgerion Ltd | Wholesale & retail | 2018 |
| Bullgrip Ltd | Information & communication | 2018 |
| Bullough Entertainments Limited | Hospitality | 2023 |
| Bulmer & Mitchells Ltd | Hospitality | 2022 |
| Bulsteel Limited | Professional & scientific | 2022 |
| Bult Ltd | Health & social care | 2022 |
| Bumblebebeuk Ltd | Wholesale & retail | 2023 |
| Bumblebee Tree Ltd | Real estate | 2018 |
| Bumbles Children's Day Nursery Limited | Health & social care | 2017 |
| Buna Beans Coffee House Ltd | Hospitality | 2026 |
| Bundobust Ltd | Hospitality | 2013 |
| Bunka Group Ltd | Manufacturing | 2022 |
| Bunker Toys Ltd | Wholesale & retail | 2018 |
| Bunkercard Limited | Wholesale & retail | 2006 |
| Bunmi Health Ltd | Health & social care | 2023 |
| Bunny Hall Group Ltd | Construction | 2022 |
| Buns & Blends Limited | Hospitality | 2025 |
| Bunton Balls Ltd | Information & communication | 2018 |
| Bunu COM Limited | Information & communication | 2025 |
| Bupma Ltd | Professional & scientific | 2014 |
| Buraakh Investments Limited | Real estate | 2025 |
| Burak Ventures Ltd | Wholesale & retail | 2026 |
| Buraq Brand Ltd | Information & communication | 2025 |
| Buraq Hajj Limited | Administrative & support | 2019 |
| Bureau WB Limited | Professional & scientific | 2022 |
| Burendo Alliance Ltd | Financial services | 2024 |
| Burendo Ltd | Information & communication | 2018 |
| Burford Solutions Limited | Professional & scientific | 2019 |
| Burford Way Limited | Professional & scientific | 2015 |
| Burger Chef Limited | Wholesale & retail | 2018 |
| Burger Kingdom Ltd | Hospitality | 2018 |
| Burgess Electrical Ltd | Construction | 2003 |
| Burgess Partnership Limited | Professional & scientific | 1998 |
| Burghley Care Limited | Health & social care | 2021 |
| Burghley Group Limited | Health & social care | 2019 |
| Burghley Retirement Living Limited | Real estate | 2021 |
| Burglar Alarm Installer Ltd | Administrative & support | 2023 |
| Burgoo Ltd. | Hospitality | 2017 |
| Burj Property Investments Ltd | Real estate | 2022 |
| Burkett Estatex Ltd | Real estate | 2025 |
| Burleigh Court (Administration) Ltd | Real estate | 2023 |
| Burley Accountants Ltd | Professional & scientific | 2025 |
| Burley Banksy Art Limited | Arts & recreation | 2020 |
| Burley Court Management Company Limited | Households | 2018 |
| Burley Grange (19-22) Management Limited | Hospitality | 2006 |
| Burley Grange (32-35) Management Limited | Real estate | 2006 |
| Burley in Wharfedale Roofing Ltd | Construction | 2014 |
| Burley Place Limited | Real estate | 2009 |
| Burley Road Carpets Limited | Wholesale & retail | 2008 |
| Burley Road Limited | Construction | 2016 |
| Burley Road Management Company (Leeds) Limited | Real estate | 2008 |
| Burley Rufc Ltd | Arts & recreation | 2016 |
| Burley Wood Court Management Company Limited | Households | 2005 |
| Burlington Developments Limited | Real estate | 1998 |
| Burman Environmental Law Ltd | Professional & scientific | 2025 |
| Burman International Consultancy Limited | Information & communication | 2017 |
| Burmantofts Community Nursery | Education | 1998 |
| Burmantofts Community Projects | Health & social care | 1995 |
| Burmax Education Limited | Education | 2024 |
| Burn Grange Properties Limited | Real estate | 2006 |
| Burn IT Corp. Ltd | Information & communication | 2024 |
| Burn Studio Limited | Professional & scientific | 2021 |
| Burnertech Combustion Engineers Limited | Manufacturing | 1992 |