| Broadbent Enterprises (2016) Limited | Real estate | 2016 |
| Broadlands Farm Limited | Transport & logistics | 2010 |
| Brocco Hotel Ltd | Real estate | 2021 |
| Brodgers Ltd | Transport & logistics | 2023 |
| Bromley RDG Group Limited | Financial services | 2020 |
| Bromley RDG Ltd | Construction | 2001 |
| Bronte Barbarians Limited | Arts & recreation | 2016 |
| Brook Coaching & Consultancy Ltd | Professional & scientific | 2015 |
| Brook HQ LLP | | 2011 |
| Brook Leisure Group Limited | Professional & scientific | 2015 |
| Brooke Supplies & Garden Centre Limited | Wholesale & retail | 2022 |
| Brookfield (Wilthorpe) Management Company Limited | Households | 2004 |
| Brookfield Garage (UK) Limited | Administrative & support | 2009 |
| Brookside Developments (Yorkshire) Limited | Real estate | 2025 |
| Brookson (5432P) Limited | Administrative & support | 2007 |
| Brothers Convenience Ltd | Wholesale & retail | 2022 |
| Brothers Heating Limited | Construction | 2019 |
| Brow Brows Limited | Other services | 2019 |
| Brown Bear Comedy Ltd | Arts & recreation | 2025 |
| Browns Family Jewellers Limited | Wholesale & retail | 2006 |
| Brows and Lashes Ltd | Other services | 2022 |
| BRS Yorkshire Limited | Real estate | 2018 |
| Brse Ltd | Transport & logistics | 2021 |
| Brush & Bloom Ltd | Construction | 2025 |
| Bryan Mason Catering Butchers Ltd | Wholesale & retail | 2005 |
| Bryson Properties Ltd | Real estate | 2025 |
| BRZ Motor Services Limited | Wholesale & retail | 2026 |
| Bsquared Coaching Ltd | Education | 2025 |
| BSR Vehicle Services Ltd | Wholesale & retail | 2022 |
| BSS Master Limited | Other services | 2025 |
| BSS Star Seller Ltd | Wholesale & retail | 2025 |
| BST Rail Ltd | Information & communication | 2018 |
| Bstp Financial Services Limited | Financial services | 2024 |
| BSW Property Consultants Limited | Real estate | 2001 |
| BT Joinery Yorkshire Ltd | Construction | 2024 |
| BU Medispa Ltd | Health & social care | 2022 |
| Bubble and Squeeze Ltd | Hospitality | 2023 |
| Bubbles Tots Ltd | Health & social care | 2025 |
| Bucovina Gourmet Ltd | Wholesale & retail | 2024 |
| Build 11 Ltd | Construction | 2024 |
| Build Advance Ltd | Construction | 2023 |
| Build Costs Estimating Ltd | Construction | 2023 |
| Building Future Developments Limited | Wholesale & retail | 1996 |
| Building OUR Skills Academy Limited | Education | 2019 |
| Building Plastics Direct Holdings Limited | Financial services | 2018 |
| Building Plastics Direct Limited | Wholesale & retail | 2009 |
| Buildmore Developments Ltd | Construction | 2020 |
| Bunobair Services Ltd | Construction | 2025 |
| Burgass Hine Estates Limited | Administrative & support | 2010 |
| Burgess and Burgess Property Investments Ltd | Households | 2025 |
| Burgin B Limited | Wholesale & retail | 2021 |
| Burgindriver 01 Limited | Transport & logistics | 2016 |
| Burgundy Media Ltd | Information & communication | 2021 |
| Burleigh Court (Barnsley) Management Limited | Households | 1992 |
| Burmox Construction (Barnsley) Ltd | Construction | 2024 |
| Burntwood Sports Limited | Hospitality | 1977 |
| Burrow Catering Limited | Hospitality | 2025 |
| Burrows Online Ltd | Wholesale & retail | 2020 |
| Burstingbox Limited | Other services | 2016 |
| Burton Grange Property Ltd | Real estate | 2025 |
| Bury & Walkers LLP | | 2009 |
| Business Living (Millshaw) Management Company Limited | Construction | 2007 |
| Business Living (Novus) Management Company Limited | Construction | 2008 |
| Business Samaritans Limited | Extraterritorial | 2023 |
| Business Samaritans UK Ltd | Extraterritorial | 2011 |
| Business Support Group LLP | | 2017 |
| Business Techcoms Limited | Wholesale & retail | 2020 |
| Bustruckservices Ltd | Wholesale & retail | 2023 |
| Busy MIA Limited | Transport & logistics | 2019 |
| Butler & Moss Ltd | Real estate | 2024 |
| Buttons Wakefield Ltd | Hospitality | 2025 |
| Buzoianu Logistics Limited | Transport & logistics | 2022 |
| Bvtalentmanagement Limited | Professional & scientific | 2024 |
| BW Fencing Supplies Ltd | Construction | 2022 |
| BW Letts Limited | Real estate | 2026 |
| Bylines Networks Limited | Information & communication | 2021 |
| C & a R Investments | Financial services | 2022 |
| C & C Advanced Limited | Administrative & support | 2012 |
| C & C L Properties Ltd | Real estate | 2024 |
| C & D Cleaning Services Limited | Administrative & support | 2000 |
| C & D Cleaning Solutions Ltd | Administrative & support | 2013 |
| C & G Industrial Services Ltd | Professional & scientific | 2008 |
| C & I Lettings Ltd | Real estate | 2009 |
| C & J Media Limited | Professional & scientific | 2010 |
| C & J Welding & Fabrication Ltd | Professional & scientific | 2001 |
| C & L Future Property Investments Limited | Real estate | 2025 |
| C & M Brickwork Ltd | Construction | 2023 |
| C & R Office Limited | Financial services | 2017 |
| C Allott Digital Marketing Ltd | Information & communication | 2025 |
| C E Transformation Ltd | Professional & scientific | 2014 |
| C Firth Garden to Field Ltd | Administrative & support | 2025 |
| C Firth Group Ltd | Manufacturing | 2023 |
| C Fowler Media Limited | Information & communication | 2023 |
| C Harris Plumbing & Heating Ltd | Extraterritorial | 2019 |
| C Lister Painting & Decorating Ltd | Construction | 2025 |
| C M Smith Limited | Real estate | 2017 |
| C Marshall Solutions Ltd | Hospitality | 2023 |
| C N Services (Yorkshire) Limited | Construction | 2003 |
| C P Typing Limited | Hospitality | 2008 |
| C S Lister Limited | Construction | 2014 |