| Bootham ROW Apartments Management Company Limited | Households | 2020 |
| Bootham School Estates Limited | Real estate | 1990 |
| Bootham Traders (York) Limited | Administrative & support | 2023 |
| Boothfloor Limited | Wholesale & retail | 2013 |
| Boothman Property Associates Limited | Administrative & support | 2020 |
| Boothomatic Limited | Other services | 2018 |
| Bootsfinder Limited | Wholesale & retail | 2021 |
| Boptech Ltd | Professional & scientific | 2021 |
| BOR Group Ltd | Manufacturing | 2019 |
| Bora Bora Limited | Hospitality | 2013 |
| BORCO23 Limited | Construction | 2022 |
| Border Associates (UK) Limited | Professional & scientific | 2014 |
| Border Collie Rescue | Professional & scientific | 1995 |
| Border Cottage Care Limited | Administrative & support | 2010 |
| Boroughbridge Arrows Marina Ltd | Real estate | 2025 |
| Boroughbridge Budget Cars Ltd | Wholesale & retail | 2026 |
| Boroughbridge Chiropody & Podiatry Ltd | Health & social care | 2026 |
| Boroughbridge High Street Management Ltd | Households | 2009 |
| Boroughbridge Motors Limited | Wholesale & retail | 1978 |
| Boroughbridge Plumbing & Heating LLP | | 2002 |
| Boss Motorhome Hire Ltd | Administrative & support | 2021 |
| Boston Rigging Services Limited | Construction | 2015 |
| Bosun-Chair Property Development & Lettings Ltd | Construction | 2016 |
| Boswa Ltd | Wholesale & retail | 2026 |
| BOT Soft Limited | Information & communication | 2022 |
| Botley Park Golf Club Limited | Hospitality | 2013 |
| Botting & Co Limited | Professional & scientific | 1995 |
| Bottles and Casks York Holding Limited | Financial services | 2023 |
| Boulevard Mews Management Limited | Real estate | 2005 |
| Boulton Moor (Derby) Properties Limited | Households | 2019 |
| Boundless Beauty Aesthetics Ltd | Other services | 2020 |
| Bourgognes Unlimited | Financial services | 2024 |
| Bourne Estate Holdings Ltd | Real estate | 2022 |
| Bourton Vale Equine Clinic Limited | Professional & scientific | 2006 |
| Boutipi Yorkshire Ltd | Hospitality | 2021 |
| Boutique Barges Limited | Hospitality | 2015 |
| Boutique Lettings Ltd | Households | 2025 |
| Boutique Stays York Limited | Real estate | 2023 |
| Boville Partners Ltd | Financial services | 2026 |
| BOW Asset Management Limited | Financial services | 2026 |
| BOW House Digital Limited | Professional & scientific | 2016 |
| Bowes Design Ltd | Professional & scientific | 2024 |
| Bowles Green Limited | Professional & scientific | 1999 |
| Bowling Lane, Acomb Limited | Households | 2020 |
| Box Clever Trading Ltd | Wholesale & retail | 2011 |
| Box Tree Developments Ltd | Administrative & support | 2000 |
| Box Tree Escapes Ltd | Hospitality | 2019 |
| Boxcubic Limited | Information & communication | 2010 |
| Boxing Business Network Lancashire Limited | Other services | 2026 |
| Boxing Business Network Ltd | Administrative & support | 2026 |
| Boxing Hare Limited | Hospitality | 2013 |
| Boxing Marketing Services Ltd | Professional & scientific | 2021 |
| Boxwood Investments Ltd | Real estate | 2026 |
| Boxxe GP | Financial services | 2024 |
| Boxxe Investments | Financial services | 2024 |
| Boxxe Limited | Information & communication | 1987 |
| Boxxe LP | | 2024 |
| Boyes United Services Ltd | Other services | 2020 |
| Boyton Place (Haverhill) Residents Management Company Limited | Households | 2018 |
| Bozza Fodder Harrogate Ltd | Hospitality | 2024 |
| BP Properties York Ltd | Real estate | 2020 |
| BPM Plumbing & Heating Limited | Construction | 2005 |
| BPN Services Group Ltd | Wholesale & retail | 2023 |
| BR Digital Solutions Ltd | Professional & scientific | 2024 |
| BR Stove Fitters Ltd | Construction | 2017 |
| Braak Quarters Limited | Financial services | 2026 |
| Brabbs Marine Ltd | Construction | 2018 |
| Brace of Harrogate Limited | Wholesale & retail | 2007 |
| Bracken Studio Ltd | Professional & scientific | 2022 |
| Brackendale Court RTM Company Limited | Households | 2024 |
| Brackendale Lodge RTM Company Limited | Households | 2024 |
| Brackendale Mews RTM Company Limited | Households | 2024 |
| Brackendale Property Ltd | Real estate | 2026 |
| Brackenleigh (Carlisle) Management Company Limited | Households | 2012 |
| Brackes Business Appointments Ltd | Administrative & support | 2010 |
| Bracklinn Asset Management Ltd | Hospitality | 2020 |
| Bradford Owen Limited | Construction | 2005 |
| Bradley & Sons Capital Ltd | Real estate | 2026 |
| Bradley & Trotter Restoration Ltd | Administrative & support | 2014 |
| Bradley Barton View Management Company Limited | Households | 2021 |
| Bradley Bell (Staithes) Ltd | Real estate | 2015 |
| Bradley Business Park (Huddersfield) Limited | Extraterritorial | 2010 |
| Bradley Fields Property Ltd | Real estate | 2023 |
| Bradley Manor Management Company Limited | Households | 2003 |
| Bradley Park (Market Weighton) Residents Management Company Limited | Households | 2025 |
| Bradshaws of York Limited | Hospitality | 2000 |
| Braeside (Sleights) Limited | Real estate | 2016 |
| Brafferton Partners Limited | Real estate | 2012 |
| Braid Software Ltd | Information & communication | 2024 |
| Brain Tumour Focus CIC | Health & social care | 2025 |
| Braithwaite Building Ltd | Construction | 2019 |
| Braithwaites Jewellers Ltd | Wholesale & retail | 2023 |
| Bram Homes Ltd | Construction | 2023 |
| Bram Services Ltd | Professional & scientific | 2023 |
| Bramarpla Limited | Administrative & support | 2017 |
| Bramble Properties Limited | Real estate | 2015 |
| Bramble Rise (Hetton) Management Company Limited | Households | 2019 |
| Brambles Consulting Limited | Other services | 2022 |
| Bramham House Ltd | Construction | 2021 |
| Brammer Construction & Civil Engineering Ltd | Construction | 2023 |