| Arnold R & R Limited | Energy | 2014 |
| Arnolds Autos Limited | Wholesale & retail | 2006 |
| Arogyam Limited | Real estate | 2010 |
| Aroi Ltd | Hospitality | 2026 |
| Aromax Ltd | Wholesale & retail | 2025 |
| Aromica Foods Ltd | Hospitality | 2025 |
| Aromica Ltd | Hospitality | 2025 |
| Arosa Developments Limited | Real estate | 2024 |
| Arowanis Holdings Limited | Financial services | 2017 |
| ARP Foods Limited | Hospitality | 2010 |
| Arrival Design Limited | Information & communication | 2005 |
| Arrival PR Ltd | Professional & scientific | 2025 |
| Arronbrook Limited | Manufacturing | 1987 |
| Arrow Driving Academy Limited | Education | 2013 |
| Arrow Driving Group Ltd | Financial services | 2015 |
| Arrow Fleet Driving Ltd | Education | 2015 |
| Arrows Tracking Solutions Ltd | Information & communication | 2009 |
| Art Deck Hire Ltd | Administrative & support | 2025 |
| Art Engineering (Hull) Ltd | Professional & scientific | 2021 |
| Art Hotels UK Limited | Hospitality | 2005 |
| Art of Work Printing Ltd | Manufacturing | 2025 |
| Art Stone International UK Ltd | Manufacturing | 2024 |
| Artawi Ltd | Wholesale & retail | 2025 |
| Artemis Greek Taverna Ltd | Hospitality | 2020 |
| Arthouse Gallery Bar Limited | Hospitality | 2018 |
| Arthritis WE Care Limited | Manufacturing | 2012 |
| Artificial Grass Installers Yorkshire Ltd | Administrative & support | 2024 |
| Artificial Intelligence-Tech Ltd | Information & communication | 2025 |
| Arting Ltd | Arts & recreation | 2021 |
| Artlink Centre for Community Arts | Arts & recreation | 2001 |
| Artsgraphica Limited | Administrative & support | 2015 |
| Artsholding | Administrative & support | 2014 |
| Artus Transport Limited | Transport & logistics | 2016 |
| ARU Party Ltd | Wholesale & retail | 2020 |
| ARW Products Ltd | Wholesale & retail | 2015 |
| AS & at Limited | Transport & logistics | 2024 |
| AS 25 Ltd | Real estate | 2025 |
| AS Properties (Hull) Ltd | Real estate | 2024 |
| As-Suffa Education Ltd | Health & social care | 2022 |
| ASA Hull Limited | Wholesale & retail | 2025 |
| Asad Pizza Hull Limited | Hospitality | 2022 |
| Asan Food Limited | Hospitality | 2024 |
| Asbestos Awareness and Identification Services Limited | Construction | 2002 |
| ASC Properties (Yorkshire) Limited | Real estate | 2020 |
| Ascend Hull CIC | Health & social care | 2020 |
| Ascension H Events Ltd | Administrative & support | 2025 |
| Ascent Business Consulting Ltd | Professional & scientific | 2017 |
| Ascope Shipping Services Limited | Transport & logistics | 2013 |
| ASD UK Trading Ltd | Wholesale & retail | 2017 |
| Asdeep Limited | Information & communication | 2026 |
| Asgeir Ltd. | Professional & scientific | 2015 |
| ASH Access Ltd | Mining & quarrying | 2025 |
| ASH Properties (Hull) Limited | Real estate | 2020 |
| ASH Tribe Ltd | Wholesale & retail | 2025 |
| ASH Young Ltd | Professional & scientific | 2025 |
| Ashdene 2 Ltd | Other services | 2025 |
| Ashfield (Hull) Limited | Real estate | 2010 |
| Ashford Cladding Systems (Holdings) Limited | Financial services | 2019 |
| Ashford Cladding Systems Limited | Construction | 1988 |
| Ashford Flat Roofing Systems Limited | Construction | 2023 |
| Ashford Logistics Ltd | Transport & logistics | 2024 |
| Ashford Self Storage Hull Limited | Real estate | 2022 |
| Ashgreen Solutions Limited | Professional & scientific | 2015 |
| Ashpian Ltd | Transport & logistics | 2013 |
| Ashton Property Company Ltd | Real estate | 2015 |
| Asian Bazaar Hull Limited | Wholesale & retail | 2018 |
| Asian Bazar Hull Ltd | Wholesale & retail | 2025 |
| ASK Driving Services Limited | Transport & logistics | 2024 |
| ASK Fire Safety Ltd | Financial services | 2024 |
| ASK Residences Ltd | Real estate | 2024 |
| Askange Limited | Professional & scientific | 2021 |
| Askew Local Ltd | Wholesale & retail | 2024 |
| Asko Pizza Ltd | Hospitality | 2023 |
| Aspect Corporate Clothing Limited | Professional & scientific | 2008 |
| Aspect Property Yorkshire Ltd | Construction | 2025 |
| Aspen Consulting Limited | Administrative & support | 2021 |
| Aspen Property Ltd | Real estate | 2024 |
| Asphalt-Iq Limited | Manufacturing | 2020 |
| Aspiral Developments Limited | Construction | 2015 |
| Aspire Athlete Management Limited | Professional & scientific | 2026 |
| Aspire Connect Academy Ltd | Education | 2025 |
| Aspire Connect CIC | Wholesale & retail | 2024 |
| Aspire Football Academy Ltd | Education | 2026 |
| Aspire Goalkeeping Ltd | Wholesale & retail | 2020 |
| Aspire Hull CIC | Health & social care | 2024 |
| Aspire Marketing and Lead Generation Ltd | Administrative & support | 2018 |
| Aspire to Inspire Hull Ltd | Health & social care | 2025 |
| Aspiring Minds (Hull) Ltd | Education | 2018 |
| Assailant Film Productions Limited | Information & communication | 2021 |
| ASSET4M Engineering Limited | Professional & scientific | 2017 |
| Assist.Claims (Yorkshire) LLP | | 2016 |
| Associated Apothecaries Limited | Wholesale & retail | 2004 |
| Associated Growers Ltd | Wholesale & retail | 2020 |
| Associated Marine Services Limited | Transport & logistics | 2004 |
| Associated Plastic Components Limited | Manufacturing | 1993 |
| Assurance GAS & Plumbing Services Ltd | Construction | 2016 |
| Assure Home Ltd | Administrative & support | 2018 |
| Assured Marketing Ltd | Administrative & support | 2020 |
| Assurelife Ltd | Financial services | 2011 |
| Astaris Consultants Limited | Professional & scientific | 2021 |