| Assured Hosting Services Limited | Professional & scientific | 2013 |
| Aster Ecology Limited | Professional & scientific | 2026 |
| AT Home - Specialists in Care Ltd | Health & social care | 2014 |
| Atkin Estates Ltd | Real estate | 2024 |
| Atlantis Hull Ltd | Hospitality | 2015 |
| Atomic Racing Limited | Arts & recreation | 2019 |
| Auto Warehouse (Yorkshire) Limited | Wholesale & retail | 2004 |
| Automotive Romance Limited | Professional & scientific | 2025 |
| Avaire Active Limited | Wholesale & retail | 2026 |
| AW & FMW Holdings Limited | Financial services | 2021 |
| AWE Technical Services Limited | Construction | 2021 |
| AWI Outsourcing Ltd | Construction | 1997 |
| Axholme Car Co Ltd | Wholesale & retail | 2013 |
| Ayci 69 Ltd | Transport & logistics | 2019 |
| AZ5 Ltd | Professional & scientific | 2024 |
| Aztec Business Consultants Ltd | Professional & scientific | 2025 |
| B & B Haulage Ltd | Transport & logistics | 2005 |
| B & B Leisure Ltd | Hospitality | 2026 |
| B & H Tuition Limited | Education | 2026 |
| B R Wood & Co Limited | Energy | 2022 |
| B S D Construction Limited | Construction | 2001 |
| B T a P S Limited | Arts & recreation | 2021 |
| B.B. Farms Limited | Agriculture & fishing | 1984 |
| Backhouse Construction & Landscaping Ltd | Construction | 2020 |
| Bains Civil Engineering Limited | Construction | 2014 |
| Bainton Arable Farming Limited | Agriculture & fishing | 2002 |
| Bainton Burrows Ltd | Hospitality | 2024 |
| Balgap Limited | Real estate | 1995 |
| Balkan Developments Ltd | Construction | 2018 |
| Balloon Fiestas Limited | Administrative & support | 2017 |
| Bankside Industrial Engineers Limited | Manufacturing | 1974 |
| Bannisters Arable Products Limited | Professional & scientific | 1976 |
| Bar Wench Ltd | Hospitality | 2022 |
| Barkbridge Limited | Real estate | 2004 |
| Barker & Grantham (Brandesburton) Limited | Construction | 2009 |
| Barker & Grantham (Contracts) Limited | Construction | 2010 |
| Barker Electrical Group Limited | Manufacturing | 2026 |
| Barmby Carr Limited | Construction | 2020 |
| Barry Clark Plumbing & Heating Limited | Construction | 2003 |
| Bastiman Builders Ltd | Construction | 2018 |
| Bastiman Holdings Ltd | Financial services | 2024 |
| Bayliss Mobility Ltd | Wholesale & retail | 2005 |
| BCO Accountants LLP | | 2021 |
| BDS (Yorkshire) Limited | Construction | 1998 |
| Beagle Heritage Limited | Manufacturing | 2018 |
| Beautifully Shuttered Ltd | Extraterritorial | 2014 |
| BEAUTIQUE32 Limited | Other services | 2022 |
| Beech Electrical Limited | Construction | 2012 |
| Beech Lawn (Operations) Limited | Health & social care | 2024 |
| Beeches Property Management Limited | Households | 2023 |
| Beeeyond Travel Limited | Administrative & support | 2025 |
| Beef Improvement Grouping Limited | Agriculture & fishing | 1993 |
| Beelocal Ltd | Professional & scientific | 2023 |
| Beerclub Ventures Ltd | Wholesale & retail | 2018 |
| Bell and Shinn Developments Limited | Construction | 1989 |
| Bell Wealth Management Limited | Financial services | 2011 |
| Belver Properties Limited | Real estate | 2020 |
| Bema Service Ltd | Wholesale & retail | 2024 |
| BEN Berriman Ltd | Construction | 2026 |
| Benefit Holdings Ltd | Extraterritorial | 2025 |
| Bespoke Steel Yorkshire Limited | Manufacturing | 2019 |
| Better Drives Limited | Professional & scientific | 2010 |
| Better Drives Services Limited | Extraterritorial | 2008 |
| Beverley & Somerset Homes Ltd | Real estate | 2019 |
| Beverley Breakout Ltd | Arts & recreation | 2019 |
| Beverley Timber Buildings Ltd | Construction | 2020 |
| Beverley Tool Hire Ltd | Administrative & support | 2011 |
| Bewford Limited | Professional & scientific | 2004 |
| Beyond the Box Ltd | Wholesale & retail | 2024 |
| Big Sky Quality Solutions Ltd | Other services | 2020 |
| Bigcsb Limited | Construction | 2007 |
| Bigvits Group Limited | Other services | 2016 |
| BIO Release Nitrogen Limited | Wholesale & retail | 2020 |
| Bio-Tech Solutions Limited | Manufacturing | 2002 |
| Biomass Projects UK Ltd | Professional & scientific | 2017 |
| Bioremediation Group Limited | Water & waste | 2026 |
| Birch Valley Holdings Limited | Financial services | 2015 |
| Birdie Nominee Limited | Financial services | 2023 |
| Bishops House Furnishers Limited | Extraterritorial | 1951 |
| Bison Autodesign Limited | Wholesale & retail | 2016 |
| Black FOX Custom Limited | Administrative & support | 2020 |
| Black Mill Holdings Ltd | Construction | 2023 |
| Black YAK Ltd | Wholesale & retail | 2003 |
| Blackburn Food Consultant Ltd | Hospitality | 2024 |
| Blackridge Archery Limited | Wholesale & retail | 2017 |
| Bladon Farming Limited | Agriculture & fishing | 2015 |
| Blakeycatering Limited | Hospitality | 2025 |
| Blue (EU) Limited | Arts & recreation | 2002 |
| Blue Marble Equestrian Ltd | Wholesale & retail | 2020 |
| Blue Sundays Ltd | Administrative & support | 2020 |
| Bluejay 14 Business Consultants Limited | Administrative & support | 2011 |
| Blyth & Co Corporate Services Ltd | Professional & scientific | 2000 |
| BM Paws Limited | Other services | 2018 |
| BN Mechanical Services Limited | Wholesale & retail | 2002 |
| Boarcross Holdings Limited | Financial services | 2024 |
| Boarcross Limited | Agriculture & fishing | 1984 |
| Boiler Care (Hull) Limited | Manufacturing | 2020 |
| Bolder Group Ltd. | Information & communication | 2018 |
| BOO Designs Limited | Professional & scientific | 1995 |
| Books by Laura Ltd | Professional & scientific | 2024 |