| Built With Code Ltd | Information & communication | 2013 |
| Buita Transport Ltd | Transport & logistics | 2025 |
| Bukky Ltd | Wholesale & retail | 2025 |
| Bulk Garage Nutrition Limited | Arts & recreation | 2012 |
| Bulk Sugar Solutions Ltd | Transport & logistics | 2026 |
| Bulkx Ltd | Transport & logistics | 2022 |
| Bunbox Ltd | Hospitality | 2025 |
| Bundle Trade Ltd | Wholesale & retail | 2024 |
| Buner Trades Ltd | Wholesale & retail | 2025 |
| Bunker'D Crazy Golf Limited | Administrative & support | 2015 |
| Buon Appetito (Marfleet) Limited | Hospitality | 2019 |
| Buraga Sterling Ltd | Administrative & support | 2013 |
| Burall Infosmart Limited | Manufacturing | 1988 |
| Burbidge Psychological Services Ltd | Health & social care | 2009 |
| Burdn Limited | Information & communication | 2026 |
| Bureau Engineering Limited | Information & communication | 2017 |
| Burflex (Projects) Limited | Construction | 2023 |
| Burflex (Scaffolding) Ltd | Construction | 2003 |
| Burflex Assets Limited | Financial services | 2023 |
| Burge Pilates Limited | Real estate | 2025 |
| Burge Productions Limited | Information & communication | 2023 |
| Burger Bites Limited | Hospitality | 2018 |
| Burger HUT (Hull) Limited | Hospitality | 2022 |
| Burger HUT Service Limited | Hospitality | 2026 |
| Burley Louth Properties Limited | Real estate | 2022 |
| Burman Consultancy Limited | Administrative & support | 2010 |
| Burnett House Hull East Limited | Construction | 2017 |
| Burnett House Hull West Limited | Construction | 2017 |
| Burnham Services Limited | Construction | 1994 |
| Burning Car Ltd | Hospitality | 2022 |
| Burns Head Inn Limited | Hospitality | 2016 |
| Burstwick Automotive Limited | Wholesale & retail | 2007 |
| Burstwick Doggy Day Care Limited | Other services | 2026 |
| Burstwick Kennels Ltd | Other services | 2023 |
| Burton Constable Enterprises Limited | Wholesale & retail | 2026 |
| Burton Court (York) Management Limited | Households | 1984 |
| Burton Hospitality Ltd | Professional & scientific | 2023 |
| Burton Property Investments (Hull) Limited | Financial services | 2026 |
| Burton Property Investments LLP | | 2011 |
| Burton Waters Landings Management Limited | Real estate | 2004 |
| Burtonwood Ltd | Construction | 2011 |
| Business 101 Limited | Information & communication | 2012 |
| Business Coaching Ltd | Professional & scientific | 2015 |
| Business Construction Ltd | Construction | 2024 |
| Business Innovators Ltd | Professional & scientific | 2026 |
| Business Rates Ltd | Professional & scientific | 2013 |
| Business Strategy Specialists Ltd | Information & communication | 2011 |
| Busra Barbers Ltd | Other services | 2026 |
| Butlers Grove Limited | Hospitality | 2021 |
| Butterflies Pre-School Limited | Education | 2008 |
| Butterfly City Community Interest Company | Other services | 2026 |
| Butters Properties Limited | Real estate | 2020 |
| Butterworth Bros. (Electrical) Limited | Construction | 1957 |
| BUY4DISCOUNTS Ltd | Wholesale & retail | 2025 |
| Buymix Ltd | Wholesale & retail | 2023 |
| Buytica Ltd | Wholesale & retail | 2025 |
| Buzanda Medicare Limited | Health & social care | 2024 |
| Buzzard Subsea Consultancy Limited | Mining & quarrying | 2024 |
| Buzzcut Barber Ltd | Other services | 2025 |
| BV Super Market Limited | Wholesale & retail | 2026 |
| BVG Property Investments Limited | Real estate | 2023 |
| BW Business Group Limited | Hospitality | 2023 |
| BW Publishing and Events Group Limited | Hospitality | 2022 |
| Bwfh Ltd | Information & communication | 2019 |
| BX3 Ltd | Wholesale & retail | 2026 |
| BY Design Holidays Limited | Administrative & support | 2017 |
| Byass Plant Ltd | Construction | 2013 |
| BYF Leisure Limited | Hospitality | 2025 |
| Byford Management Consultants Limited | Professional & scientific | 2001 |
| Bygrace Established Ltd | Information & communication | 2026 |
| Bylouie Hair and Makeup Ltd | Other services | 2021 |
| Byte Software Ltd | Manufacturing | 2021 |
| C & J Electrical Services Ltd | Manufacturing | 2021 |
| C & L Properties (Hull) Ltd | Real estate | 2025 |
| C & M Engineering (Yorkshire) Limited | Construction | 1998 |
| C & M Properties ( Hull ) Limited | Real estate | 2020 |
| C & M Transport (Preston) Limited | Transport & logistics | 2006 |
| C & N Door Services Ltd | Manufacturing | 2012 |
| C & S Holding Group Ltd | Financial services | 2026 |
| C & S Holding Group Management Ltd | Administrative & support | 2026 |
| C & W Properties (Hull) Limited | Real estate | 2026 |
| C a Maintenance Services Ltd | Construction | 2017 |
| C and M News Ltd | Wholesale & retail | 2026 |
| C Bowers Consultancy Ltd | Construction | 2021 |
| C Brown Electrical Limited | Construction | 2025 |
| C C Cook Plumbing & Heating Ltd | Construction | 2021 |
| C Ellis Joinery & Installations Ltd | Construction | 2022 |
| C F Struthers (Holdings) Limited | Professional & scientific | 2009 |
| C F Struthers (Hull) Limited | Professional & scientific | 2004 |
| C Fewster & SON Funeral Services Limited | Extraterritorial | 2015 |
| C G Tattoos Limited | Other services | 2023 |
| C Hart & Company (Hull) Limited | Administrative & support | 2016 |
| C J Contract Services Limited | Professional & scientific | 2011 |
| C J W Maintenance Limited | Construction | 2010 |
| C Johnson Travel Ltd | Administrative & support | 2025 |
| C L (Hull) Limited | Hospitality | 2019 |
| C Norfolk Consultancy Limited | Professional & scientific | 2022 |
| C O Tankers Ltd | Transport & logistics | 2006 |
| C P Marine UK Ltd | Administrative & support | 2008 |
| C S S Yorkshire Limited | Construction | 2000 |