| Brampton Vale (Rotherham) Management Company Limited | Households | 2024 |
| Branch and Stem Ltd | Education | 2026 |
| Brand Developments (York) Limited | Construction | 2017 |
| Brand Prospectors Ltd. | Hospitality | 2015 |
| Brandconcerns Limited | Professional & scientific | 2013 |
| Branded TM Limited | Professional & scientific | 2013 |
| Brands Creative Limited | Other services | 2015 |
| Branicki Ltd | Transport & logistics | 2013 |
| Bransby Wilson Group Ltd | Administrative & support | 2011 |
| Bransby Wilson Parking Solutions Limited | Professional & scientific | 2003 |
| Bransby Wilson Properties Limited | Real estate | 2001 |
| Brascote Park Management Company Limited | Households | 2025 |
| Brass Band Radio Ltd. | Information & communication | 2018 |
| Brassknocker Enterprises Limited | Professional & scientific | 2000 |
| Brathay Fell Management Limited | Households | 1978 |
| Bratten Pathology Ltd | Health & social care | 2016 |
| Bravedas Solutions Ltd | Information & communication | 2025 |
| Brayton Building & Plumbing Co Ltd | Construction | 2014 |
| Brazen Search Ltd | Administrative & support | 2025 |
| Brazilian Real Estate Ltd. | Extraterritorial | 2006 |
| Breakaway 51 Limited | Professional & scientific | 2025 |
| Breakblock Limited | Extraterritorial | 1997 |
| Breakthrough Advisors Ltd | Professional & scientific | 2012 |
| Breck House Enterprises Ltd | Agriculture & fishing | 2002 |
| Brecks Court Management Limited | Households | 2020 |
| Breckstreet Investments Unlimited | Financial services | 2022 |
| Breecy Limited | Construction | 1989 |
| Breezy Properties Ltd | Extraterritorial | 2024 |
| Brem Ltd | Administrative & support | 2022 |
| Brenwin Consultancies Ltd | Professional & scientific | 2025 |
| Brett COX Haulage Ltd | Transport & logistics | 2025 |
| Brew & Brownie Limited | Hospitality | 2021 |
| Brew York Bars Ltd | Hospitality | 2020 |
| Brew York Brewery Ltd | Manufacturing | 2020 |
| Brew York Limited | Manufacturing | 2015 |
| Brew'D. Community Coffee Co. Ltd | Hospitality | 2025 |
| Brewed UP North Limited | Professional & scientific | 2010 |
| Brewery and Hops Limited | Hospitality | 2024 |
| Brewhemian Hopsody Ltd | Hospitality | 2025 |
| Brewing Services Ltd | Professional & scientific | 2017 |
| Brewtown Limited | Administrative & support | 2016 |
| Brian Bell Associates Limited | Professional & scientific | 2013 |
| Brian Bell Carpets Limited | Construction | 2007 |
| Brian Jones Upholstery Ltd | Other services | 2012 |
| Brian Plant Carpet & Flooring Limited | Construction | 2003 |
| Brian Royd Consulting Limited | Professional & scientific | 2025 |
| Brian Whincup & Sons Limited | Manufacturing | 2003 |
| Brian Yeardley Limited | Extraterritorial | 1990 |
| Brick Slip Fitters Ltd | Construction | 2020 |
| Bricknell Fold Management Company Ltd | Households | 2021 |
| Brickyard Leisure Ltd | Administrative & support | 2018 |
| Brid Build Limited | Construction | 2007 |
| Bridbuild Construction Limited | Construction | 2018 |
| Bridge Bakes Ltd | Hospitality | 2022 |
| Bridge Beck Road Ltd | Real estate | 2019 |
| Bridge CM Training Ltd | Education | 2025 |
| Bridge Employment Law Ltd | Professional & scientific | 2015 |
| Bridge House Watton Limited | Other services | 2020 |
| Bridge Lettings Limited | Real estate | 2014 |
| Bridge Social & Marketing Ltd | Other services | 2026 |
| Bridgend (Wetherby) Management Company Limited | Households | 2007 |
| Bridges & Buckle Holdings Limited | Real estate | 2022 |
| Bridges & Buckle Property Group Limited | Real estate | 2023 |
| Bridges & Buckle Trading Group Limited | Construction | 2023 |
| Brierley Groom LLP | | 2009 |
| Brigandine Ltd | Arts & recreation | 2014 |
| Brigantia (York) Limited | Wholesale & retail | 2013 |
| Brigantia Personal Care Ltd | Manufacturing | 2017 |
| Briggsbuild Ltd | Construction | 2019 |
| Bright Asbestos Solutions Ltd | Professional & scientific | 2026 |
| Bright Beginnings Child Care Agency Limited | Administrative & support | 2007 |
| Bright Click Media Ltd | Professional & scientific | 2026 |
| Bright Five Ltd | Arts & recreation | 2003 |
| Bright Ideas (Sally Walker) Limited | Wholesale & retail | 2008 |
| Bright Ideas Events Ltd | Arts & recreation | 2021 |
| Bright Rhino Innovation Ltd | Professional & scientific | 2024 |
| Bright Sparks of York Ltd | Construction | 2023 |
| Brightbox North Ltd | Professional & scientific | 2020 |
| Brightlights Entertainment Limited | Arts & recreation | 2016 |
| Brightorder UK Limited | Information & communication | 2019 |
| Brightshield Learning Ltd | Education | 2025 |
| Brightstone Services Ltd | Professional & scientific | 2024 |
| Brighty Co Limited | Information & communication | 2023 |
| Brikselr Limited | Wholesale & retail | 1988 |
| Brilla Ltd | Manufacturing | 2021 |
| Brilliant Decorators Limited | Construction | 2021 |
| Brin Engineering Limited | Manufacturing | 1999 |
| Bringelly Limited | Real estate | 2010 |
| Brinkworth Rush Developments Limited | Construction | 2020 |
| Brinkworth Rush Management Company (S.E.) Limited | Households | 2021 |
| Brisk Productions Ltd | Information & communication | 2026 |
| Britania Properties (U.K.) Ltd | Real estate | 2025 |
| Britcab Limited | Construction | 2007 |
| Britcom Developments Limited | Construction | 2021 |
| Britech Limited | Information & communication | 2022 |
| British and International Golf Greenkeepers Association Limited | Education | 2009 |
| British Association of Green Crop Driers Limited(The) | Agriculture & fishing | 1963 |
| Britlyx Ltd | Wholesale & retail | 2025 |
| Britsafe EOT Limited | Extraterritorial | 2022 |
| Britsafe Limited | Administrative & support | 1993 |