| BB Visual Ltd | Professional & scientific | 2021 |
| BBI Holdings Ltd | Real estate | 2020 |
| BE Cooled Limited | Construction | 2020 |
| BE YOU Aesthetics Training Ltd | Education | 2019 |
| Be:Rt Production Limited | Financial services | 2023 |
| Beadnall Copley Lettings Limited | Real estate | 2013 |
| Beadnall Copley Limited | Real estate | 2013 |
| Beadnall Copley Management Services LLP | | 2013 |
| Beagle Searches Ltd | Information & communication | 2024 |
| Bears & Liquors Ltd | Hospitality | 2025 |
| Beautybymolliemae Ltd | Other services | 2022 |
| BEE Pubs Ltd | Hospitality | 2024 |
| Beetle Green Ltd | Information & communication | 2016 |
| Beijer REF Academy Ltd. | Education | 2019 |
| Being ME Limited | Professional & scientific | 2017 |
| BEL Sourire Ltd | Manufacturing | 2023 |
| Belgravia Enterprises Limited | Construction | 2022 |
| Belinda Milligan Physiotherapy Limited | Other services | 2013 |
| Bella's in Lincoln Ltd | Hospitality | 2025 |
| Belwight Limited | Professional & scientific | 2015 |
| Belwight TOO Ltd | Financial services | 2022 |
| Bengal Lounge (Wetherby) Limited | Hospitality | 2018 |
| Benjamin Wilson Property Ltd | Real estate | 2025 |
| Bentley Properties (Preston) Limited | Professional & scientific | 2005 |
| Besafe Corporation Limited | Wholesale & retail | 2007 |
| Bespoke Homes Yorkshire Ltd | Construction | 2023 |
| Bespoke Yorkshire Furniture Ltd | Wholesale & retail | 2024 |
| Best Solution for Boring Limited | Information & communication | 2023 |
| BET Limited | Arts & recreation | 2015 |
| Beta Trade Fairs Limited | Other services | 1981 |
| Betme Limited | Arts & recreation | 2016 |
| Better Fish Limited | Hospitality | 1963 |
| Betterlearn Limited | Real estate | 2014 |
| Bewise Waste Solutions Limited | Professional & scientific | 2022 |
| Biedermann Motech International Limited | Manufacturing | 2015 |
| Bikebox Online Ltd | Manufacturing | 2013 |
| Binary Factory Limited | Information & communication | 2017 |
| Bioconnections Ltd | Wholesale & retail | 2017 |
| Biraln Holdings Ltd | Financial services | 2025 |
| Birdsall & Bennett (Wetherby) Limited | Professional & scientific | 2025 |
| Birdsall & Bennett LLP | | 2004 |
| Birdsnest's Best Ltd | Hospitality | 2021 |
| Bishops Court (Ripon) Management Company Limited | Households | 1994 |
| Bitepro Limited | Manufacturing | 2016 |
| Bitwise AI Limited | Information & communication | 2024 |
| BIY Limited | Administrative & support | 2012 |
| BJD Macer Ltd | Health & social care | 2025 |
| Bjets Property Ltd | Real estate | 2025 |
| BKO Developments Limited | Construction | 2025 |
| Black Book Locations Limited | Wholesale & retail | 2020 |
| Black Door Social Ltd | Professional & scientific | 2021 |
| Black Duck Bars Ltd | Hospitality | 2023 |
| Black Event Furniture Limited | Extraterritorial | 2019 |
| Black Family Limited | Financial services | 2025 |
| Black Orange Management Limited | Professional & scientific | 2012 |
| Black Property Development Limited | Construction | 2015 |
| Blackberry Estate Holdings Ltd | Financial services | 2026 |
| Blackbird Property Investments Limited | Real estate | 2020 |
| Blacks Industries Limited | Professional & scientific | 2007 |
| Blacks London Limited | Extraterritorial | 1998 |
| Blacks Visual Merchandising (Holdings) Limited | Extraterritorial | 2003 |
| Blacks Visual Merchandising Limited | Manufacturing | 1998 |
| Blade Investments Limited | Financial services | 2022 |
| Blendboutique Ltd | Wholesale & retail | 2009 |
| BLG Assist Ltd | Professional & scientific | 2012 |
| BLG Capital Ltd | Real estate | 1998 |
| Bliss Systems Limited | Information & communication | 2005 |
| Bloom Stack Limited | Information & communication | 2025 |
| Bloxed Beats Ltd | Information & communication | 2016 |
| BLU Hair and Beauty Limited | Other services | 2004 |
| Bluchie Productions Ltd | Information & communication | 2025 |
| Blue Astral Consulting Ltd | Professional & scientific | 2017 |
| Blue COD Consultants Limited | Extraterritorial | 2007 |
| Blue COD Property Investment Limited | Real estate | 2018 |
| Blue Crown Storage Ltd | Transport & logistics | 2024 |
| Blue DOT Professional Services Limited | Professional & scientific | 2015 |
| Blue Sky Design Interiors Limited | Other services | 2005 |
| Blue Star Consultancy Limited | Information & communication | 2003 |
| Blue Star Lettings Limited | Real estate | 2020 |
| Bluebell (Leeds) Ltd | Construction | 1957 |
| Bluebell Care Services Limited | Health & social care | 2006 |
| BMJ Innovations Ltd | Information & communication | 2026 |
| BO Living Limited | Financial services | 2019 |
| BOB Sergeant Limited | Agriculture & fishing | 2002 |
| BOH Productions Limited | Arts & recreation | 2014 |
| BON Properties Limited | Real estate | 2019 |
| Bonham Court Flat Management Company Limited | Real estate | 2009 |
| Bonsanare Ltd | Real estate | 2021 |
| Bookaby Ltd | Information & communication | 2019 |
| Bookkeeping Simple Ltd | Financial services | 2026 |
| Boston Financial Services Limited | Real estate | 1999 |
| Boston Gates Trading Limited | Other services | 2019 |
| Boston Holdings Limited | Real estate | 2003 |
| Boston House Limited | Professional & scientific | 1997 |
| Boston Spa Bees Limited | Agriculture & fishing | 2025 |
| Boston Spa Digital Ltd | Professional & scientific | 2023 |
| Boston Spa Ltd | Hospitality | 2025 |
| Boston Spa Market Ltd | Wholesale & retail | 2025 |
| Bottle and Bean (Wetherby) Limited | Wholesale & retail | 2017 |
| Bowcliffe Hall Limited | Professional & scientific | 2014 |