| Brown & Quinn Limited | Professional & scientific | 2026 |
| Brown Dog Design Limited | Professional & scientific | 1997 |
| Brown Royd Accountants Ltd | Professional & scientific | 2013 |
| Brownhill Wind Farm Ltd | Energy | 2022 |
| Brownie Stand Ltd | Hospitality | 2026 |
| Brownie Ventures Limited | Real estate | 2026 |
| Brsp Limited | Health & social care | 2022 |
| BRU Jointing Ltd | Administrative & support | 2023 |
| Bruce Kenneth Limited | Manufacturing | 2016 |
| Brulee Desserts Ltd | Hospitality | 2025 |
| Bruniges Trading Ltd | Wholesale & retail | 2022 |
| Brunswick Centre | Health & social care | 1992 |
| Brunswick Mill Storage Centre Ltd | Administrative & support | 2025 |
| Brunswick Mill Studios (Salford) Ltd | Information & communication | 2021 |
| Bry's Private Hire Ltd | Transport & logistics | 2025 |
| Bryter Solutions Limited | Health & social care | 2020 |
| BS Comfy Ltd | Wholesale & retail | 2024 |
| BSC Projects Ltd | Construction | 2014 |
| BSL Estates Limited | Real estate | 2011 |
| BST5 Ltd | Construction | 2019 |
| BSV1 Ltd | Hospitality | 2025 |
| BSV2 Ltd | Hospitality | 2025 |
| BTB Commercial Management Ltd | Professional & scientific | 2023 |
| BTG - Bridge the GAP C.I.C. | Education | 2024 |
| BTN by Arooj Ltd | Administrative & support | 2025 |
| BTS Consulting Limited | Professional & scientific | 2015 |
| Bubblerun Hand Car Wash Limited | Other services | 2013 |
| Buckle Invest Limited | Financial services | 2018 |
| Buckley Farm Dairy Limited | Transport & logistics | 1989 |
| Buckley Farming Services Limited | Water & waste | 2012 |
| Build Consultancy Ltd | Professional & scientific | 2025 |
| Build the MAN Ltd | Education | 2023 |
| Builden Ltd | Construction | 2023 |
| Builder ANT Limited | Administrative & support | 2017 |
| Buildflow Consulting Ltd | Information & communication | 2022 |
| Building & Home Planning Services Limited | Construction | 2021 |
| Building Services Systems Ltd | Construction | 2016 |
| Bukt Ltd | Information & communication | 2026 |
| Bumroyd Property Management Ltd | Real estate | 2020 |
| Bundle of Works Limited | Financial services | 2020 |
| Bundle Packaging Limited | Administrative & support | 2019 |
| Burger & Frites Ltd | Hospitality | 2020 |
| Burger Boiz UK Ltd | Hospitality | 2019 |
| Burger Spot Ltd | Hospitality | 2026 |
| Burgerboysuk Ltd | Hospitality | 2022 |
| Burgers (Oldl) Ltd | Wholesale & retail | 2024 |
| Burgers Oldham Ltd | Wholesale & retail | 2023 |
| Burgoyne Investments Ltd | Financial services | 2020 |
| Burgundy Care Services Ltd | Health & social care | 2010 |
| Burhouse Beads Limited | Extraterritorial | 2015 |
| Burhouse Holdings Limited | Administrative & support | 2017 |
| Burhouse Limited | Wholesale & retail | 1970 |
| Burkhill Enterprises (Dronfield) Ltd | Agriculture & fishing | 2024 |
| Burkinshaw Contracting Ltd | Construction | 2022 |
| Burland Engineering Limited | Administrative & support | 2012 |
| Burlington House (Huddersfield) Management Company Limited | Real estate | 2003 |
| Burridge Drilling Limited | Wholesale & retail | 1993 |
| Burton Lounge Limited | Hospitality | 2022 |
| Burtree Hill Ltd | Real estate | 2023 |
| Burwin Limited | Construction | 1987 |
| Business Advantage Limited | Professional & scientific | 2020 |
| Business Innovation & Growth Limited | Professional & scientific | 2018 |
| Business Insights Marketing Studies Limited | Professional & scientific | 2025 |
| Business Marketing Group Ltd | Professional & scientific | 2025 |
| Business Marketing Services Limited | Administrative & support | 2017 |
| Business Performance Success Ltd | Professional & scientific | 2018 |
| Business Service Solutions Ltd | Information & communication | 2009 |
| Business Services Leeds Limited | Administrative & support | 2011 |
| Busy Bees Store Ltd | Wholesale & retail | 2023 |
| Butt Riders Ltd | Transport & logistics | 2025 |
| Butterfield Refrigeration Limited | Manufacturing | 2009 |
| Butties (Skelmanthorpe) Ltd | Hospitality | 2003 |
| Butty Shed Ltd | Hospitality | 2024 |
| Buxus Properties Limited | Real estate | 2025 |
| Buy IT Direct Ltd | Wholesale & retail | 2001 |
| Buy Trends Limited | Wholesale & retail | 2025 |
| Buyerland UK Ltd | Wholesale & retail | 2015 |
| Buyquick Ltd | Other services | 2026 |
| Buzz Business Development Limited | Professional & scientific | 2021 |
| BUZZ2GO Ltd | Transport & logistics | 2025 |
| Bvanzeu Ltd | Wholesale & retail | 2025 |
| BW Aquatic Consultants Ltd | Wholesale & retail | 2021 |
| BW Corporate Limited | Real estate | 2018 |
| BW Signature Stays Ltd | Hospitality | 2026 |
| BWR Motorsport Ltd | Arts & recreation | 2024 |
| BY Fabienne Ltd | Professional & scientific | 2020 |
| Bybitsystem Ltd | Information & communication | 2026 |
| Byblitza Ltd | Wholesale & retail | 2021 |
| Bycoh Ltd | Other services | 2026 |
| Byoot Fresh Ltd | Construction | 2026 |
| Byram Construction Limited | Construction | 2001 |
| Byram Consultancy Services Ltd | Extraterritorial | 2010 |
| Byram’S Ltd | Hospitality | 2026 |
| Byroms Lettings Ltd | Real estate | 2013 |
| Byshoko Limited | Wholesale & retail | 2024 |
| Bytebasket Limited | Wholesale & retail | 2025 |
| Bytesnbrands Ltd | Professional & scientific | 2024 |
| Bytey Badger Limited | Information & communication | 2025 |
| Bytol Ltd | Real estate | 2020 |
| BZ100 Limited | Construction | 2026 |