| Access Flooring Association Limited | Other services | 1987 |
| Access Mobility Hull Limited | Wholesale & retail | 2025 |
| Acclaim Property Limited | Real estate | 2017 |
| Accommodation Centre (Hull) Limited | Real estate | 1973 |
| Accommodation Nation Ltd | Real estate | 2013 |
| Accountaholics Limited | Professional & scientific | 2014 |
| Accountancy Tuition Academy Limited | Education | 2021 |
| Accountforit Ltd | Professional & scientific | 2020 |
| Accounting Solution (Audit) Ltd | Professional & scientific | 2009 |
| Accounting Solution (GB) Ltd | Professional & scientific | 2006 |
| Acdesignworks Ltd | Manufacturing | 2021 |
| Ace K Metal Ltd | Manufacturing | 2025 |
| Ace Kangaroo Limited | Health & social care | 2023 |
| Ace Medic Limited | Health & social care | 2025 |
| Ace Resurfacing Commercial Limited | Construction | 2024 |
| Acehilm Productions Ltd | Information & communication | 2025 |
| Aces Cakes Official Ltd | Hospitality | 2025 |
| Acetech Aluminium Ltd | Extraterritorial | 2019 |
| Acetech Engineering Limited | Extraterritorial | 2020 |
| ACF Residential Holdings Limited | Real estate | 2025 |
| ACN Electrical Limited | Construction | 2016 |
| ACN Solar & Facilities Management Ltd | Construction | 2023 |
| ACO Media Ltd | Extraterritorial | 2025 |
| Acocks Green Management Limited | Hospitality | 2021 |
| Acomb Engineering Limited | Manufacturing | 2000 |
| Acorn (Hull) Limited | Manufacturing | 2005 |
| Acorn 17 (Holding) Limited | Financial services | 2023 |
| Acorn Sheetmetal Ltd | Administrative & support | 2018 |
| Acoustinert Ltd | Wholesale & retail | 2018 |
| Acrosentec UK Ltd | Manufacturing | 2024 |
| ACS (Hull) Ltd | Households | 2009 |
| Acsu Limited | Professional & scientific | 2025 |
| Acta Diurna Media Ltd | Arts & recreation | 2020 |
| Acta Proprietas Ltd | Real estate | 2023 |
| Action Services (Hull) Ltd | Other services | 2012 |
| Action Tracks | | 1995 |
| Activation Limited | Arts & recreation | 2002 |
| Active Creations Limited | Wholesale & retail | 2022 |
| Active Day Care Hull Ltd | Health & social care | 2015 |
| Active Humber Ltd | Arts & recreation | 2013 |
| Active Investment Managers Limited | Financial services | 1987 |
| Active Lift Trucks Ltd | Professional & scientific | 2019 |
| Active Sports Development CIC | Education | 2025 |
| ACTIVE13VENTURES Ltd | Professional & scientific | 2021 |
| Activity Junction Ltd | Hospitality | 2024 |
| Acton Taylor Management Ltd | Wholesale & retail | 2022 |
| AD Investments International Ltd | Financial services | 2023 |
| AD Plumbing & Heating (Beverley) Ltd | Construction | 2012 |
| ADA Fabrication Ltd | Manufacturing | 2026 |
| ADA Rendering Ltd | Construction | 2018 |
| Adam Halal Butcher (Springbank) Limited | Wholesale & retail | 2020 |
| Adam Hill Photography Limited | Professional & scientific | 2026 |
| Adam Pizza Palas Ltd | Hospitality | 2024 |
| Adam's Selection Limited | Wholesale & retail | 2023 |
| Adams Amusements Limited | Extraterritorial | 1960 |
| Adams Phone FIX Limited | Other services | 2022 |
| Adamson Estates (Swanland) Ltd | Wholesale & retail | 1983 |
| Adamsony Limited | Wholesale & retail | 2025 |
| Adar Haulage Ltd | Transport & logistics | 2024 |
| Adatrans TD Ltd | Other services | 2017 |
| Added Value Portal Limited | Professional & scientific | 2019 |
| Addi Express Pizza Ltd | Hospitality | 2016 |
| Addz Properties Ltd | Real estate | 2024 |
| Adef Properties Ltd | Real estate | 2022 |
| Adelaide Leads Road Hand Car Wash Limited | Other services | 2020 |
| Ademi Holdings Limited | Construction | 2019 |
| Adeori Ltd | Wholesale & retail | 2023 |
| Aderam Logistics Ltd | Transport & logistics | 2023 |
| Adewuyi Healthcare Services Limited | Professional & scientific | 2022 |
| Adexr Technologies Ltd | Information & communication | 2025 |
| ADH IT Consulting Limited | Information & communication | 2023 |
| ADH Mechanical (Hull) Ltd | Construction | 2016 |
| Adhiban Cosmetics Limited | Manufacturing | 2024 |
| Adka Independence (East Yorks) Ltd | Health & social care | 2011 |
| Adkins & Moss Ltd | Wholesale & retail | 2024 |
| Adlards a Star Fitness Ltd | Arts & recreation | 2023 |
| Adleads Limited | Information & communication | 2016 |
| ADM Accountancy and Business Services Limited | Professional & scientific | 2015 |
| Adman Consultancy Limited | Other services | 2012 |
| Admorspace Limited | Construction | 2004 |
| ADN Pizza Limited | Hospitality | 2019 |
| Adonai Food Store Ltd | Other services | 2020 |
| Adorn Aesthetics Studio Limited | Other services | 2023 |
| ADR Aluminium Door Repairs Limited | Construction | 2013 |
| Adran Maintenance Limited | Wholesale & retail | 2023 |
| Adrian Dodds Transport Limited | Transport & logistics | 2019 |
| Adrian Piechowski Properties Ltd | Real estate | 2021 |
| Adriana AMF Limited | Transport & logistics | 2024 |
| Adshinwari Enterprises Ltd | Wholesale & retail | 2025 |
| Adubem Limited | Wholesale & retail | 2026 |
| Advance Automotive Centre Limited | Wholesale & retail | 2007 |
| Advance Property (Yorkshire) Limited | Real estate | 2013 |
| Advanced Air Systems Limited | Wholesale & retail | 2008 |
| Advanced Alarms Limited | Administrative & support | 2008 |
| Advanced Care Yorkshire Limited | Health & social care | 2011 |
| Advanced Cleaning Solutions Ltd | Construction | 2015 |
| Advanced Clinical Practitioner Support (Acps) Limited | Health & social care | 2022 |
| Advanced Coatings Ltd | Construction | 2023 |
| Advanced CSV Ltd | Information & communication | 2024 |
| Advanced GAS Services (East Yorkshire) Limited | Construction | 2001 |