| BG Stephenson Limited | Real estate | 2024 |
| BGC Management Services Limited | Other services | 2024 |
| BH Bootham Limited | Real estate | 2020 |
| BH Plumbing (Wetherby) Ltd | Construction | 2025 |
| BH PPM Limited | Professional & scientific | 2013 |
| BHE Agricultural Contractors Ltd | Agriculture & fishing | 2002 |
| BHM Consulting Limited | Professional & scientific | 2015 |
| BI & BM Mosey LLP | | 2009 |
| BI Horizons Consulting Limited | Professional & scientific | 2018 |
| Biba House Freehold Limited | Real estate | 2024 |
| Biba the Group Limited | Construction | 2016 |
| Bica Italian Group Ltd | Financial services | 2023 |
| Bica Italian Ltd | Hospitality | 2019 |
| Bica Italian Property Ltd | Real estate | 2024 |
| BID Consultancy Solutions Ltd | Professional & scientific | 2019 |
| BID Projects Limited | Professional & scientific | 2015 |
| Bidwise Enterprises Ltd | Information & communication | 2026 |
| Big Audio Media Limited | Information & communication | 2022 |
| Big Bear Games Ltd | Information & communication | 2019 |
| Big Blue Ocean Cleanup CIC | Other services | 2024 |
| Big Christmas Concert Ltd | Arts & recreation | 2025 |
| Big Ideai Limited | Professional & scientific | 2023 |
| Big Ings LLP | | 2011 |
| Big S Kitchen Limited | Hospitality | 2025 |
| Big Tent Foundation | Education | 2017 |
| Big Tent Ideas Festival Ltd | Education | 2018 |
| Bigg B Holdings Ltd | Construction | 2026 |
| Bigga Greenkeepers Benevolent Fund Limited | Other services | 2013 |
| Biju Krishnan Consulting Ltd | Health & social care | 2020 |
| Bike Morzine Limited | Hospitality | 2014 |
| Billington Buckley Property Limited | Real estate | 2025 |
| Billy Garritty Racing Ltd | Arts & recreation | 2025 |
| Bilmet Foods Ltd | Hospitality | 2026 |
| Bilton Estates Ltd | Real estate | 2025 |
| Bilton Properties Limited | Construction | 1959 |
| BIM Quantity Surveying Services Limited | Construction | 2013 |
| Bingham Software Ltd | Information & communication | 2017 |
| Binnington Finance Limited | Financial services | 2024 |
| Binoy Ltd | Health & social care | 2024 |
| Bioapp Holdings Limited | Real estate | 2020 |
| Bioelements Limited | Manufacturing | 2013 |
| Biofyx Limited | Professional & scientific | 2008 |
| Biomax Limited | Professional & scientific | 2000 |
| Biomimicry Innovation LAB Limited | Information & communication | 2019 |
| Biomimicry UK | Professional & scientific | 2015 |
| Bionourish Limited | Health & social care | 2020 |
| Bioquote Limited | Wholesale & retail | 1987 |
| Biorta Ltd | Wholesale & retail | 2020 |
| Bioscapes Group Limited | Financial services | 2026 |
| Biostar Limited | Agriculture & fishing | 1984 |
| Biovate Limited | Wholesale & retail | 2017 |
| Birch House Group (UK) Limited | Hospitality | 2022 |
| Birchfields Accountants Limited | Professional & scientific | 2016 |
| Birchwood Manor (Wardley) Residents Management Company Limited | Real estate | 2023 |
| Birchwood Plant Rentals Limited | Administrative & support | 2017 |
| Birchwood Veterinary Practice Limited | Professional & scientific | 2019 |
| Bircumshaw Development Securities Ltd | Real estate | 2021 |
| Bird House Hair and Beauty Ltd | Other services | 2023 |
| Bird Jones Haulage Limited | Water & waste | 2022 |
| Birdcage Tech Ltd | Information & communication | 2023 |
| Birds Piano Academy Ltd | Wholesale & retail | 2020 |
| Birdstrike Management Holdings Limited | Financial services | 2025 |
| Birdstrike Management Ltd. | Transport & logistics | 2013 |
| Birmingham TAP Ltd | Hospitality | 2017 |
| Bisca Bespoke Staircases Limited | Real estate | 2012 |
| Bish Bash POT Limited | Arts & recreation | 2017 |
| Bish Road York Limited | Hospitality | 2021 |
| Bish Two York Limited | Hospitality | 2021 |
| Bishopdale Investments Ltd | Real estate | 2015 |
| Bishopdale Sporting Club Ltd | Agriculture & fishing | 2026 |
| Bishopgate House Holdings Limited | Professional & scientific | 2006 |
| Bishophill House Management Company Limited | Real estate | 2008 |
| Bishops Development (York) Ltd | Construction | 2022 |
| Bishops Green (Coundon) Management Company Limited | Real estate | 2021 |
| Bishops Mead (Lydney) Management Company Limited | Households | 2019 |
| Bishops Meade (Downton) Management Company Limited | Households | 2016 |
| Bishops Personal Agents Limited | Real estate | 2021 |
| Bishops Wharf (York) Management Company Limited | Households | 1988 |
| Bishopshead Properties Ltd | Real estate | 2021 |
| Bishopthorpe Consulting Limited | Professional & scientific | 2016 |
| Bishopthorpe Moorings and Marina Limited | Arts & recreation | 2023 |
| Bishopthorpe Road Traders Association Ltd | Wholesale & retail | 2025 |
| Bishy Ltd | Information & communication | 2022 |
| Bistro GUY Ltd | Other services | 2021 |
| BIT Premium Ltd | Information & communication | 2023 |
| Bite & Basket Limited | Hospitality | 2025 |
| Bite Back Pest Control Ltd | Administrative & support | 2025 |
| Bitpoint Ltd | Real estate | 2013 |
| Bivouac Limited | Professional & scientific | 2008 |
| Bizenko Limited | Information & communication | 2009 |
| Bizenko Social Enterprise Limited | Education | 2014 |
| Bizucation Ltd | Information & communication | 2012 |
| BJK Developments Limited | Professional & scientific | 2007 |
| BJL Properties Ltd | Real estate | 2020 |
| BKK Equestrian Ltd | Agriculture & fishing | 2025 |
| Bkmp Ltd | Health & social care | 2015 |
| BL Taylor Developments Limited | Construction | 2003 |
| Black & White Law Limited | Professional & scientific | 2011 |
| Black 68 Limited | Other services | 1990 |
| Black and White Research Limited | Professional & scientific | 2011 |