| Avid Retail Limited | Wholesale & retail | 2015 |
| Avid Vaper Limited | Wholesale & retail | 2015 |
| Avoca Veterinary Limited | Professional & scientific | 2023 |
| Avocet Trust | Health & social care | 1991 |
| Avolve Limited | Professional & scientific | 2024 |
| Avrupa Digital Media Limited | Manufacturing | 2014 |
| AVS Modular & Portable Ltd | Other services | 2009 |
| AW Autos Ltd | Wholesale & retail | 2025 |
| AW Property Investment Ltd | Real estate | 2020 |
| AW Weld Design Ltd | Construction | 2019 |
| Awaabslaw Ltd | Construction | 2025 |
| Awaken Counselling Ltd | Other services | 2025 |
| Awesome Proportions Limited | Professional & scientific | 2010 |
| AWJ E,C&I Commissioning Services Ltd | Professional & scientific | 2019 |
| AWJ Invest Ltd | Real estate | 2018 |
| Awms Hull Ltd | Transport & logistics | 2023 |
| Awning King Ltd | Professional & scientific | 2021 |
| AWR Machine Services Limited | Professional & scientific | 2023 |
| AWS Property Maintenance Limited | Manufacturing | 2011 |
| AXD Consultancy Ltd | Professional & scientific | 2023 |
| AXI D&E Group Limited | Financial services | 2024 |
| AXI Design and Engineering Limited | Professional & scientific | 2021 |
| AXI Energy Limited | Administrative & support | 2022 |
| AXI Group Holdings Limited | Financial services | 2022 |
| Axiom Sceptre Limited | Professional & scientific | 2026 |
| Axis Tax Advisory Limited | Professional & scientific | 2025 |
| Axsi Systems Ltd | Wholesale & retail | 2022 |
| Axton Pizza Ltd | Hospitality | 2026 |
| AYA Repair Centre Ltd | Wholesale & retail | 2025 |
| Ayan Butchers Limited | Wholesale & retail | 2023 |
| Ayaz Meat Ltd | Wholesale & retail | 2025 |
| Ayitey Ltd | Administrative & support | 2019 |
| Aylul Limited | Other services | 2025 |
| Aymb 145 Ltd | Hospitality | 2025 |
| Ayyanes Limited | Health & social care | 2021 |
| Azad Global Limited | Real estate | 2015 |
| Azad Global Properties Ltd | Information & communication | 2022 |
| Azam (Hull) Ltd | Health & social care | 2022 |
| Azevedo Ltd | Wholesale & retail | 2025 |
| Azmar Barbers 1 Ltd | Other services | 2024 |
| Azmar Hull Restaurant Ltd | Hospitality | 2026 |
| Azor Security Limited | Administrative & support | 2015 |
| Aztech Asbestos Services Ltd | Water & waste | 2024 |
| Aztech Building Repair Solutions Ltd | Construction | 2024 |
| Aztech General Contracting Ltd | Construction | 2024 |
| Azul Engineering UK Ltd | Manufacturing | 2026 |
| Azure Seafood Ltd | Wholesale & retail | 2025 |
| Azza Commercial Limited | Construction | 2021 |
| Azza Construction Limited | Construction | 2019 |
| Azza Homes Limited | Real estate | 2022 |
| B & H Buildings Limited | Construction | 1998 |
| B & IT Services Ltd | Administrative & support | 2015 |
| B & L Fire Risk Limited | Other services | 2014 |
| B & M Andrews Limited | Wholesale & retail | 2015 |
| B & P Properties 2020 Limited | Real estate | 2020 |
| B and C Software Ltd | Information & communication | 2019 |
| B and G (Group) Limited | Professional & scientific | 2014 |
| B B Electric (Hull) Limited | Construction | 2012 |
| B Batch Holdings Limited | Financial services | 2017 |
| B Gill Developments Ltd | Construction | 2026 |
| B Knowlson Properties Ltd | Real estate | 2023 |
| B M P I LLP | | 2014 |
| B&A Takeaway Ltd | Hospitality | 2024 |
| B&B Motorss Ltd | Wholesale & retail | 2024 |
| B&D Draughting Services Ltd | Professional & scientific | 2018 |
| B&D Hull Limited | Hospitality | 2025 |
| B&D Joinery Installations Limited | Construction | 2023 |
| B&N Stores (Hull) Limited | Wholesale & retail | 2019 |
| B&S Electronics Ltd | Wholesale & retail | 2026 |
| B&W Developments Ltd | Construction | 2024 |
| B&W Lettings Ltd | Real estate | 2021 |
| B-Side Newland Ltd | Hospitality | 2024 |
| B. Drewery & SON (Haulage) Limited | Transport & logistics | 2004 |
| B. LEE Engineering Limited | Professional & scientific | 2016 |
| B.F Renewables Services Limited | Information & communication | 2025 |
| B.G.S Heritage Ltd | Construction | 2026 |
| B.G.S Load Test Ltd | Professional & scientific | 2025 |
| B.P.A. Expertising Limited | Professional & scientific | 1978 |
| B.R. Foster & Sons (Hull) Limited | Wholesale & retail | 1975 |
| B.S.B Consulting Limited | Real estate | 2007 |
| B12 Aesthetics Ltd | Other services | 2023 |
| BA Medics Limited | Health & social care | 2022 |
| Baba Stores Limited | Wholesale & retail | 2019 |
| Baba's Retail Limited | Wholesale & retail | 2022 |
| Babelon (Hull) Ltd | Hospitality | 2015 |
| Baby Ballroom Limited | Education | 2019 |
| Baby Wins Competitions Ltd | Arts & recreation | 2025 |
| Babylon Supermarket Limited | Wholesale & retail | 2011 |
| Back Academy Limited | Professional & scientific | 2020 |
| Back to Ours Arts Limited | Arts & recreation | 2021 |
| Backhouse Jones Limited | Professional & scientific | 2002 |
| Baden Properties Ltd | Real estate | 2020 |
| Badger Logistics Ltd | Transport & logistics | 2026 |
| Badger Quinn Ltd | Wholesale & retail | 2026 |
| Badgers Locksmiths Ltd | Professional & scientific | 2019 |
| Badran Limited | Wholesale & retail | 2026 |
| BAE (Management & BI) Consulting Ltd | Information & communication | 2016 |
| BAE by RLB Ltd | Health & social care | 2026 |
| Baggaley & Co Limited | Wholesale & retail | 2024 |
| Bail Bonds Ltd | Financial services | 2022 |