| 13THIRTEEN Property Management Ltd | Real estate | 2015 |
| 1CREATE Limited | Wholesale & retail | 2017 |
| 2AJ Trading Limited | Wholesale & retail | 2014 |
| 2B Landscape Consultancy Ltd | Professional & scientific | 2002 |
| 3 Fathom Limited | Arts & recreation | 2002 |
| 4 Cladding Services Limited | Administrative & support | 2003 |
| 4TEES Logistics Ltd | Transport & logistics | 2023 |
| 53 Degree Fish & Chips Ltd | Hospitality | 2022 |
| 53 Degree North (Brough) Ltd | Hospitality | 2012 |
| 786 Investment Property Ltd | Real estate | 2024 |
| 97 Martongate Limited | Health & social care | 2021 |
| @NO.1 Hair and Beauty Salon and Educators Ltd | Other services | 2020 |
| A & a Properties (Beverley) Ltd | Real estate | 2025 |
| A & F Consulting Engineers LLP | | 2013 |
| A & J Coletta Ltd | Professional & scientific | 2015 |
| A M Electrical & Consultancy Limited | Energy | 2010 |
| A T Plant Hire (Yorkshire) Limited | Administrative & support | 2025 |
| A&G Delivery Ltd | Transport & logistics | 2024 |
| A&J Childcare Ltd | Administrative & support | 2017 |
| A. P. Doctors Limited | Health & social care | 2013 |
| Abbey Construction Consultants Ltd | Construction | 2002 |
| Absolute Seafood Consulting Ltd | Professional & scientific | 2021 |
| Absorb Studios Ltd | Professional & scientific | 2022 |
| ACW Haulage Ltd | Transport & logistics | 2021 |
| Adams Food Safety Limited | Health & social care | 2015 |
| Addy Building & Roofing Ltd | Construction | 2025 |
| ADV Body Repair Ltd | Wholesale & retail | 2024 |
| ADV LC Holdings Limited | Financial services | 2025 |
| Aemv Healthcare Services Ltd | Health & social care | 2023 |
| Aesthea Ltd | Other services | 2025 |
| Aesthetic Design Services Limited | Health & social care | 2023 |
| Aesthetics by Leanne Limited | Health & social care | 2024 |
| Aggreforce Ltd | Transport & logistics | 2017 |
| Aghoco 2214 Limited | Financial services | 2022 |
| Agri Carry Ltd | Manufacturing | 2013 |
| AIM Resin Flooring Limited | Construction | 2025 |
| Aitken Venture Group Ltd | Financial services | 2025 |
| AJ & LVJ Consulting Services Ltd | Professional & scientific | 2026 |
| AJC & Sons Ltd | Health & social care | 2025 |
| AJS Plant Services Limited | Manufacturing | 2017 |
| AJT Corporate Travel Ltd | Transport & logistics | 2016 |
| Akasha Wellbeing Spa Limited | Health & social care | 2020 |
| AL Gold Wheels Transport Ltd | Construction | 2016 |
| AL Training & Resources Limited | Education | 2026 |
| Alan Leighton (Hull) Limited | Construction | 1985 |
| Alando Design Ltd | Professional & scientific | 2014 |
| Alastair Holdings Limited | Administrative & support | 2023 |
| ALE Holdings Limited | Financial services | 2019 |
| Alesi Properties Limited | Real estate | 2010 |
| Alex HAY Salon Limited | Other services | 2024 |
| Alix Properties Limited | Real estate | 2016 |
| Alix Property Management Ltd | Administrative & support | 2016 |
| Alpha Associates UK Limited | Transport & logistics | 2006 |
| Alpha Worldwide Logistics Limited | Transport & logistics | 2011 |
| Althea Aesthetics Ltd | Health & social care | 2025 |
| Amazing Lets Limited | Real estate | 2015 |
| AME World Events Ltd | Administrative & support | 2015 |
| Amiya Banda Limited | Hospitality | 2024 |
| Ampm Retail Solutions Ltd | Real estate | 2013 |
| AMZ Surgical and Crafts Ltd | Wholesale & retail | 2022 |
| Anahit Solutions Limited | Information & communication | 2024 |
| Anish Retails UK Ltd | Wholesale & retail | 2018 |
| Anston Landscapes Limited | Administrative & support | 2017 |
| Antony Dickson Ltd | Financial services | 2011 |
| Anygym Limited | Information & communication | 2025 |
| Apex Sports Events Ltd | Arts & recreation | 2026 |
| Aplw Electrical Engineering Limited | Manufacturing | 2011 |
| Appleyard Remarketing Solutions Ltd | Wholesale & retail | 2013 |
| Applied Management Techniques Ltd | Professional & scientific | 2020 |
| AR2 Architects Limited | Professional & scientific | 2006 |
| Arbgrind Ltd | Professional & scientific | 2022 |
| Arielle Holdings Ltd | Real estate | 2019 |
| Armosa Tech Ltd | Professional & scientific | 2021 |
| Arodo (UK) Limited | Wholesale & retail | 1998 |
| Artec Publications Ltd | Information & communication | 2014 |
| Arthur Bean & Sons (Welton) Limited | Real estate | 1988 |
| Artura Blinds (Yorkshire) Ltd | Wholesale & retail | 2014 |
| AS Holidays Limited | Administrative & support | 2015 |
| Ashgreen Holdings Ltd | Real estate | 2023 |
| Aspire Graphix Ltd | Arts & recreation | 2019 |
| Asset Centred Solutions Ltd | Administrative & support | 2023 |
| Assure Property Group Ltd | Construction | 2002 |
| Aston House Properties Limited | Real estate | 2016 |
| Astrelise Ltd | Manufacturing | 2026 |
| Athena Signs Limited | Administrative & support | 2003 |
| Atkinson FM Services Ltd | Administrative & support | 2025 |
| Atsey Consulting Limited | Professional & scientific | 2025 |
| Aviary (U.K.) Limited | Professional & scientific | 2008 |
| AW Aviation Ltd | Manufacturing | 2015 |
| AW Investment Group (Hull) Ltd | Real estate | 2024 |
| AW Property Group Ltd | Real estate | 2023 |
| Axel IM LLP | | 2023 |
| Axel Investment Management Ltd | Real estate | 2023 |
| Axis Auto Motor Group Limited | Transport & logistics | 2025 |
| Axis Telecom Ltd | Real estate | 2001 |
| B J S a Property Limited | Real estate | 2025 |
| B P Bettison Limited | Financial services | 2013 |
| B S Panesar & Associates Limited | Professional & scientific | 2003 |
| Baarda Ltd | Professional & scientific | 2017 |
| Bar RC Ltd | Hospitality | 2015 |