| Bespoke WBB Limited | Manufacturing | 2022 |
| Best Accountancy Services Ltd | Administrative & support | 2018 |
| Best Student Living Ltd | Information & communication | 2025 |
| Bestagenda Limited | Real estate | 1995 |
| Beswetherick Field Residents Association Limited | Real estate | 2011 |
| Beswick Westbrook Limited | Extraterritorial | 2025 |
| BET 7/ 11 Ltd | Extraterritorial | 2012 |
| Beth Archer Ltd | Information & communication | 2018 |
| Betshaw Limited | Real estate | 1978 |
| Better Placed (U.K.) Limited | Administrative & support | 2014 |
| Better Placed Engineering & Manufacturing Recruitment Limited | Administrative & support | 2014 |
| Better Placed Executive Recruitment Limited | Administrative & support | 2004 |
| Better Placed Interim Recruitment Limited Liability Partnership | | 2008 |
| Better Placed Recruitment Group Limited | Professional & scientific | 2004 |
| Better Placed Technology Limited | Administrative & support | 2020 |
| Better Placed Trustees Limited | Administrative & support | 2021 |
| Betterlet Ltd | Real estate | 2011 |
| Betty Brown Wigs Limited | Wholesale & retail | 2009 |
| Bevan's Catering Ltd | Hospitality | 2018 |
| Bewb LLP | | 2025 |
| BEX Limited | Arts & recreation | 2014 |
| Bexsa Ltd | Manufacturing | 2024 |
| Beyond Yorkshire Ltd | Arts & recreation | 2023 |
| Beyout Ltd | Wholesale & retail | 2026 |
| BGS Property Limited | Real estate | 2004 |
| BGS Ventures Ltd | Administrative & support | 2025 |
| Bguk Lettings Limited | Real estate | 2026 |
| Bguk Properties Limited | Hospitality | 2025 |
| Bickerton Greenwood Limited | Professional & scientific | 2008 |
| Bidness Associates Ltd | Other services | 2015 |
| Bielby Investment Properties Limited | Real estate | 2025 |
| Bielsa 2019/20 Limited | Financial services | 2025 |
| Bielta Limited | Construction | 2022 |
| Big ASS Ltd | Extraterritorial | 2013 |
| Big Bamboo Bids Limited | Professional & scientific | 2022 |
| Big Day Hooray Ltd | Wholesale & retail | 2023 |
| Big Energy Group Ltd | Administrative & support | 2023 |
| Big Mack Limited | Real estate | 2014 |
| Big Tent Architects Ltd | Professional & scientific | 2022 |
| Bigface Beers Limited | Education | 2015 |
| Bijouled Limited | Wholesale & retail | 2006 |
| Billbo Media Ltd | Arts & recreation | 2026 |
| Bilton and Woodfield Community Library Group | Arts & recreation | 2012 |
| Bilton Dene Limited | Extraterritorial | 2014 |
| Bilton Hall Farm Management Limited | Real estate | 2003 |
| BIM Yorkshire Ltd | Professional & scientific | 2019 |
| Binary IS Limited | Information & communication | 2007 |
| Bintcliffe Ltd | Construction | 2019 |
| Bioclad Limited | Construction | 2008 |
| Biodiversity NET Gain (Yorkshire) Limited | Administrative & support | 2024 |
| Biodiversity NET Gain Co. Limited | Administrative & support | 2024 |
| Biograph Ltd | Information & communication | 2026 |
| Biotech Research Limited | Professional & scientific | 2024 |
| Birchfield (Summerbridge) Management Limited | Professional & scientific | 2002 |
| Birchfield Dog Walking and Pet Services Limited | Other services | 2017 |
| Birchmoor Holdings Limited | Financial services | 2025 |
| Birchmoor Limited | Professional & scientific | 2025 |
| Birchmoor Trustee Services Limited | Professional & scientific | 2013 |
| Birchstone Properties Limited | Real estate | 2023 |
| Birchwood Enterprises Limited | Real estate | 2011 |
| Bird + Nest Limited | Real estate | 2019 |
| Bird Construction (York) Limited | Construction | 2024 |
| Birkdale Group Ltd | Construction | 2025 |
| Birkholt Ltd | Real estate | 2018 |
| Birkwith Facilities Management Ltd | Administrative & support | 2023 |
| Birstwith Barkyard Ltd | Agriculture & fishing | 2025 |
| Bishy Road Cafe Ltd | Hospitality | 2022 |
| BIT Part Ltd | Information & communication | 2024 |
| BITCO1N Cash Limited | Extraterritorial | 2021 |
| Bite Point Limited | Hospitality | 2026 |
| BIZ Buzzio Digital Solutions Ltd | Professional & scientific | 2024 |
| Bizdaq (UK) Limited | Professional & scientific | 2014 |
| Black & Green Consultancy Ltd | Professional & scientific | 2024 |
| Black and Stock LLP | | 2016 |
| Black INK Ventures Ltd. | Professional & scientific | 2018 |
| Black Kettle Biofuels Limited | Professional & scientific | 1999 |
| Black Kettle Group Limited | Financial services | 1999 |
| Black Kettle International Limited | Financial services | 1999 |
| Black Kettle Investments Limited | Professional & scientific | 1999 |
| Black Magic Solutions Ltd | Professional & scientific | 2013 |
| Black Swan Yard Management Company Limited | Real estate | 2016 |
| Blackburn With Darwen Transport Limited | Transport & logistics | 2001 |
| Blackexotics Ltd | Health & social care | 2016 |
| Blackgold Topsoil Ltd | Administrative & support | 2025 |
| Blackhorse UK Holdco Ltd | Administrative & support | 2021 |
| Blackhorse UK Opco Ltd | Administrative & support | 2025 |
| Blackhorse UK Propco Ltd | Administrative & support | 2021 |
| Blackrock Rivers Limited | Extraterritorial | 2025 |
| Blackwall Photography Ltd | Professional & scientific | 2018 |
| Blades Yard Leisure Limited | Hospitality | 1995 |
| Blaize-Smith Limited | Extraterritorial | 2026 |
| Blake Garages Limited | Transport & logistics | 2025 |
| Blayds Limited | Construction | 1999 |
| Blazefield Buses Limited | Transport & logistics | 1991 |
| Blazefield Caravans Limited | Transport & logistics | 1988 |
| Blazefield Travel Group Limited | Transport & logistics | 1987 |
| Blenheim Films Ltd | Administrative & support | 2016 |
| Blenheim Media Limited | Information & communication | 2012 |
| Blenkhorns Boat Hire Limited | Arts & recreation | 2021 |
| Blessed Home Ltd | Administrative & support | 2017 |