| Boothferry Local Limited | Wholesale & retail | 2025 |
| Boothferry Park Ltd | Arts & recreation | 2014 |
| Bootyman Printers Limited | Manufacturing | 1992 |
| Booze Hub Hedon Ltd | Wholesale & retail | 2024 |
| Booze Parade Ltd | Wholesale & retail | 2019 |
| BOP Estates Limited | Real estate | 2024 |
| Boreas Estates Ltd | Wholesale & retail | 2017 |
| Born Boho Limited | Manufacturing | 2018 |
| Born Survivor Limited | Wholesale & retail | 2010 |
| Born to Bond CIC | Education | 2022 |
| BOS Academy Ltd | Arts & recreation | 2021 |
| Bosa Contracts Limited | Administrative & support | 1995 |
| Bosa Holdings Ltd | Professional & scientific | 2015 |
| Bosio Consulting Ltd | Manufacturing | 2020 |
| Bosio Group Holding Ltd | Financial services | 2026 |
| Bosphorus Takeaway Ltd | Hospitality | 2023 |
| Boss Burritos Limited | Hospitality | 2020 |
| Boss Comps Ltd | Information & communication | 2024 |
| Boss Lash Ltd | Other services | 2021 |
| Bossmans East Hull Ltd | Hospitality | 2025 |
| Bossmans HU9 Ltd | Hospitality | 2026 |
| Boteco Consulting Ltd | Information & communication | 2025 |
| Bottoms UP Bar Ltd | Hospitality | 2026 |
| Boujee Interiors Ltd | Professional & scientific | 2009 |
| Boujie Aesthetics Limited | Other services | 2023 |
| Boulevard Store Ltd | Wholesale & retail | 2023 |
| Bound for Glory Limited | Transport & logistics | 2018 |
| Bourne & Bourne Optical Ltd | Wholesale & retail | 2019 |
| Bowdec Services (Hull) Limited | Construction | 2011 |
| Bowden Investments 2018 Limited | Real estate | 2018 |
| Bowden Land Limited | Administrative & support | 1974 |
| Bowerson Developments Ltd | Construction | 2025 |
| Bowles International Ltd | Manufacturing | 2024 |
| Boxclub CIC | Health & social care | 2024 |
| Boynton Engineering Limited | Professional & scientific | 2016 |
| Boys Need Fathers C.I.C. | Administrative & support | 2024 |
| Boze Holdings Ltd | Real estate | 2020 |
| BP Construction & Services Ltd | Construction | 2023 |
| BR Building Contractors (Hull) Limited | Construction | 2016 |
| BR Refurbishments Limited | Construction | 2024 |
| BR8 Creations Ltd | Professional & scientific | 2024 |
| Brad Martin Holdings Ltd | Financial services | 2021 |
| Bradley Wray Ltd | Information & communication | 2025 |
| Braims Newsagents Limited | Information & communication | 2018 |
| Brain Recovery Zone Ltd | Health & social care | 2019 |
| Brainworks (Food) Limited | Manufacturing | 2016 |
| Brambles Properties Limited | Real estate | 2019 |
| Brambley Cottage Day Nursery Limited | Health & social care | 2001 |
| Bramley Apple Homes Limited | Real estate | 2024 |
| Branch View Properties Ltd | Real estate | 2025 |
| Brand 82 Limited | Hospitality | 2014 |
| Brand Apps Limited | Information & communication | 2011 |
| Brand Graphics Limited | Manufacturing | 2018 |
| Brand Investment Holdings Limited | Professional & scientific | 2022 |
| Brandon 1956 Limited | Extraterritorial | 2015 |
| Brandywell Boarding Ltd | Agriculture & fishing | 2023 |
| Bransholme Community Arts Enterprise Limited | Health & social care | 2002 |
| Bransholme Community Childcare Ltd | Education | 2007 |
| Bransholme Limited | Real estate | 2023 |
| Brantingham Agricultural Services Limited | Wholesale & retail | 2020 |
| Brantingham Park Health & Wellness Limited | Health & social care | 2008 |
| Branvex Ltd | Construction | 2025 |
| Brassica Properties Limited | Real estate | 2024 |
| Brave Chicken Animation Ltd | Arts & recreation | 2025 |
| Bravo Landscapes Ltd | Other services | 2003 |
| Brawley Construction Limited | Construction | 2007 |
| BRB Boxes Limited | Manufacturing | 2021 |
| BRD Trading Limited | Real estate | 2025 |
| Brea Rose Investments Limited | Real estate | 2023 |
| Breachr Limited | Information & communication | 2025 |
| Breakspeare Energy Ltd | Construction | 2021 |
| Breakthrough Rugby Limited | Education | 2025 |
| Breath of Fresh Air Online Ltd | Wholesale & retail | 2024 |
| Breathing Green CIC | Health & social care | 2025 |
| Breedline Ltd | Agriculture & fishing | 2026 |
| Brelfi (Holdings) Limited | Financial services | 2022 |
| Brelfi (Properties) Limited | Real estate | 2022 |
| Breng Hull Limited | Professional & scientific | 2019 |
| Brew Fables Ltd | Hospitality | 2023 |
| Brew Hull Limited | Hospitality | 2020 |
| Brewer Wallace (Property) Limited | Real estate | 2016 |
| Brewer Wallace Limited | Professional & scientific | 2011 |
| Brewer Wealth Management Ltd | Professional & scientific | 2020 |
| Brewster Property Services Ltd | Real estate | 2021 |
| Brian Cooke Furnishings Limited | Wholesale & retail | 1975 |
| Brian Lane Joinery Limited | Manufacturing | 2010 |
| Briben Housing Limited | Health & social care | 2024 |
| Bribic IT Limited | Information & communication | 2021 |
| Brick Boards (Hull) Limited | Professional & scientific | 2018 |
| Brickbarn Ltd | Manufacturing | 2026 |
| Brickcliff Limited | Construction | 2025 |
| Bricknell Building Services Limited | Construction | 2015 |
| Bricknell Star Ltd | Hospitality | 2023 |
| Brickyplasterer.Com Limited | Construction | 2008 |
| Bridge Health Holdings Limited | Real estate | 2019 |
| Bridge Learning Ltd | Education | 2025 |
| Bridge Street Hospitality Group Ltd | Hospitality | 2018 |
| Bridge View Management Company (Hull) Limited | Real estate | 2007 |
| Bridge Way Limited | Information & communication | 2015 |
| Bridgehead Management Limited | Real estate | 2012 |