| Buck Inn Yard Management Ltd | Real estate | 2006 |
| Buck Wild Ltd | Wholesale & retail | 2025 |
| Bucket List Imports Limited | Wholesale & retail | 2019 |
| Buckingham Consulting Limited | Professional & scientific | 2009 |
| Buckingham Court Management Company (York) Limited | Households | 1984 |
| Buckle Properties Ltd | Real estate | 2016 |
| Buckley for Flooring Ltd | Wholesale & retail | 2004 |
| Buckton Place (Leiston) Residents Management Company Limited | Households | 2020 |
| Buec Ltd | Wholesale & retail | 2025 |
| Buell Consulting Limited | Professional & scientific | 2012 |
| Buffalo Pizza Limited | Hospitality | 2012 |
| Buffay Entertainments Ltd | Arts & recreation | 2019 |
| Bugweed's Fabrics Limited | Wholesale & retail | 2015 |
| Bugweed's Group of Companies Limited | Wholesale & retail | 2015 |
| Bugweed's Limited | Wholesale & retail | 2015 |
| Bugweed's Retail Limited | Wholesale & retail | 2015 |
| Bugweed's Sewing Machines Limited | Wholesale & retail | 2015 |
| Bugweed's Sewing School Limited | Wholesale & retail | 2015 |
| Bugweed's Studio Limited | Wholesale & retail | 2015 |
| Bugweed's Yarn & Crafts Limited | Wholesale & retail | 2015 |
| Builder York Ltd | Construction | 2024 |
| Builders York Limited | Construction | 2023 |
| Buildex Media Limited | Wholesale & retail | 2026 |
| Buildform Ltd | Construction | 2019 |
| Building & Drawing Services Limited | Construction | 2010 |
| Building Fire Safety Limited | Extraterritorial | 2021 |
| Building Fire Safety Remediation Limited | Construction | 2020 |
| Building Maintenance Services Limited T/A the Wall Coating Company Limited | Administrative & support | 2022 |
| Building Safety Limited | Extraterritorial | 2020 |
| Building Services Advisory Partnership Limited | Professional & scientific | 2014 |
| Buildking Technologies Ltd | Information & communication | 2026 |
| Buildline (Yorkshire) Limited | Construction | 2021 |
| Buildtech Construction (York) Ltd | Construction | 2010 |
| BUK 2015 Ltd | Extraterritorial | 2014 |
| Bulk Fixings Ltd | Wholesale & retail | 2015 |
| Bull Squad Ltd | Arts & recreation | 2024 |
| Bulldog Storage Ltd | Transport & logistics | 2017 |
| Bulldogfish Ltd | Hospitality | 2013 |
| Bulut York Ltd | Hospitality | 2024 |
| Bumpkins-York Limited | Health & social care | 2016 |
| Bunker Events Limited | Arts & recreation | 2026 |
| Bunny Hill Farm Cottages Limited | Hospitality | 2019 |
| Bunny Hill Farm Weddings and Events Limited | Arts & recreation | 2018 |
| Bunting Lead Management Limited | Financial services | 2026 |
| Bunyip Financial Services Limited | Information & communication | 2004 |
| Burbiton Ltd | Administrative & support | 2017 |
| Bureau Maritime Limited | Professional & scientific | 1979 |
| Burgess Associates Limited | Professional & scientific | 2010 |
| Burgess Ice Cream Limited | Manufacturing | 2018 |
| Burgway Ltd | Health & social care | 2019 |
| Burley Place (Sittingbourne) Management Company Limited | Households | 2026 |
| Burlington Place Management Market Weighton Limited | Households | 2021 |
| Burnaby Baker Trading Company Limited | Financial services | 2016 |
| Burnby Farms | Agriculture & fishing | 2006 |
| Burned by Design Ltd | Arts & recreation | 2015 |
| Burner Bliss Ltd | Construction | 2025 |
| Burnholme Software Consulting Ltd | Information & communication | 2025 |
| Burnside Emea Ltd. | Real estate | 2014 |
| Burrell's Hiring Company Limited | Administrative & support | 2016 |
| Burro's Beverages Ltd | Hospitality | 2024 |
| Burt Property Co Ltd | Real estate | 2016 |
| Burton Chambers Ltd | Construction | 2025 |
| Burton Lewis Ltd | Real estate | 2021 |
| Burton Roofing Merchants Limited | Wholesale & retail | 1983 |
| Burton Stone Consulting Ltd | Professional & scientific | 2025 |
| Burton Stone Inn York LLP | | 2009 |
| Burton Stone Lane Management Company Limited | Households | 2017 |
| Burythorpe Ruby Limited | Professional & scientific | 2020 |
| BUS in to School Limited | Administrative & support | 2012 |
| Bushy Hill Developments Limited | Real estate | 2015 |
| Business Across Borders Ltd | Health & social care | 2015 |
| Business Coach Academy Limited | Administrative & support | 2022 |
| Business Energy Reclaims Limited | Professional & scientific | 2024 |
| Business for Change Ltd | Professional & scientific | 2025 |
| Business Leader (Holdings) Ltd | Professional & scientific | 2023 |
| Business Leader Limited | Information & communication | 2012 |
| Business Leadership Group Limited | Professional & scientific | 2025 |
| Business Living (York Business Park) Management Company Limited | Professional & scientific | 2008 |
| Business Office Management Ltd | Administrative & support | 2017 |
| Business Plan Writers UK Ltd | Professional & scientific | 2022 |
| Business Waste Holdings Ltd | Financial services | 2021 |
| Business Waste Ltd | Professional & scientific | 2014 |
| Buttercup Leys (Boulton Moor) Residential Management Company Limited | Households | 2014 |
| Butterflies Memory Loss Support Group | Other services | 2015 |
| Butterfly's Day Nursery Limited | Education | 2003 |
| Butterflys Day Nursery (Hammerton) Limited | Health & social care | 2023 |
| Butterflys Day Nursery (Hemsworth) Limited | Education | 2007 |
| Butterflys Day Nursery (Selby) Limited | Education | 2007 |
| Button-Down Ltd | Information & communication | 2015 |
| Buttonwood Developments Ltd | Real estate | 2016 |
| Buzz York Limited | Hospitality | 2023 |
| BVN Limited | Wholesale & retail | 2019 |
| BWD (York) Ltd | Construction | 2023 |
| BWH Hotels GB Limited | Hospitality | 2019 |
| Byland Consulting Limited | Professional & scientific | 2015 |
| Byland Engineering Limited | Professional & scientific | 2004 |
| Byland Estates Limited | Real estate | 1996 |
| Byland Holdings Limited | Financial services | 2023 |
| Byland Investments Ltd | Real estate | 2024 |
| BYR Yorks Ltd | Hospitality | 2026 |