| Andy Hoare Electrical Limited | Construction | 2017 |
| Andy Pool Electrical Limited | Construction | 2015 |
| Andy Sandwich Limited | Information & communication | 2026 |
| Andy Watson Design Limited | Information & communication | 2014 |
| Andy's Panini Limited | Hospitality | 2005 |
| Andysign Studio Ltd | Professional & scientific | 2025 |
| Anelixis Europe Ltd | Health & social care | 2018 |
| Anemoic Ltd | Manufacturing | 2025 |
| Anfran Ltd | Real estate | 2020 |
| Angel Investment Technology (AIT) Ltd | Information & communication | 2023 |
| Angelasanimals Ltd | Arts & recreation | 1983 |
| Angels of Easingwold Limited | Professional & scientific | 2005 |
| Anglian Septics Ltd | Water & waste | 2025 |
| Anglo BEE Properties Limited | Real estate | 1971 |
| Animal Microchips Ltd | Wholesale & retail | 2018 |
| Animal Spay and Neuter International | Professional & scientific | 2017 |
| Animal Tracker Limited | Extraterritorial | 2008 |
| Animalcare Group PLC | Financial services | 1972 |
| Animalcare Ltd | Wholesale & retail | 1980 |
| Animando Solutions Ltd | Information & communication | 2018 |
| Anita Massarella Design Limited | Manufacturing | 2003 |
| Anivita Ltd | Wholesale & retail | 2024 |
| Anjojo Ltd | Hospitality | 2026 |
| Anjok 157 Limited | Professional & scientific | 1960 |
| Anjok 172 Limited | Extraterritorial | 1976 |
| Anjok 173 Limited | Professional & scientific | 1925 |
| Anjok 28 Limited | Extraterritorial | 1965 |
| Anjok 31 Limited | Extraterritorial | 1938 |
| Anjok Five (1996) Limited | Professional & scientific | 1957 |
| Anjok Holdings Limited | Professional & scientific | 1964 |
| Anjok Investments Limited | Extraterritorial | 2015 |
| Anjok Two Limited | Extraterritorial | 1973 |
| ANN Thompson Ltd | Professional & scientific | 2006 |
| Anne Hayward Associates Limited | Education | 2003 |
| Anne Taylor Limited | Professional & scientific | 2025 |
| Anne Vita Limited | Professional & scientific | 2022 |
| Another Beer Ltd | Manufacturing | 2018 |
| Anscombs Limited | Real estate | 2004 |
| Anstew Limited | Health & social care | 2021 |
| Antam Limited | Construction | 2019 |
| Antav Ltd | Administrative & support | 2025 |
| Antennas Research Ltd | Professional & scientific | 2017 |
| Anthea Whitton Limited | Professional & scientific | 2023 |
| Anti Freeze (York) Limited | Administrative & support | 2016 |
| Anti.Dote Salons Limited | Other services | 2021 |
| Antigonie Biosciences Ltd | Professional & scientific | 2025 |
| Antimatrix Apparel Ltd | Wholesale & retail | 2025 |
| Antioch Portfolio Ltd | Real estate | 2023 |
| Ants Hill & Goose Limited | Information & communication | 2025 |
| Anurag Medical Services Limited | Health & social care | 2019 |
| Anvil Ironwork Ltd | Wholesale & retail | 2017 |
| Anvil Point Properties Limited | Real estate | 2016 |
| Anyans Limited | Construction | 1971 |
| Anytime Travel Taxis Ltd | Transport & logistics | 2014 |
| Anytime Waste Transfer Limited | Water & waste | 2010 |
| Anyway Ventures Limited | Financial services | 2025 |
| Aoac Investments Limited | Real estate | 2020 |
| Aolin Ltd | Wholesale & retail | 2024 |
| Aoraki Corporation (UK) Limited | Information & communication | 2000 |
| AP Dental Creations Ltd | Health & social care | 2024 |
| AP16 Limited | Information & communication | 2006 |
| APA Cleaning Solutions Ltd | Administrative & support | 2017 |
| Apag Studios UK Ltd | Professional & scientific | 2024 |
| Apai Ltd | Information & communication | 2019 |
| Apalapa Limited | Information & communication | 2024 |
| Apartment 32 Ltd | Hospitality | 2009 |
| APC Accountancy (NE) Limited | Professional & scientific | 2018 |
| APD Commercial Services Ltd | Professional & scientific | 2026 |
| Apeiron Energy Holdings Ltd | Professional & scientific | 2025 |
| Apek Digital Limited | Professional & scientific | 2022 |
| Apex Construction & Roofing (York) Ltd | Construction | 2026 |
| Apex Corporation Ltd | Professional & scientific | 2023 |
| Apex Global Supply Limited | Wholesale & retail | 2026 |
| Apex Joinery & Landscaping Services Limited | Administrative & support | 2025 |
| Apex Motorcycles Limited | Wholesale & retail | 2019 |
| Apex Point Limited | Real estate | 1997 |
| Apex Property & Management Ltd | Real estate | 2026 |
| Apex Property York Ltd | Construction | 2021 |
| Apex Retreats Ltd | Real estate | 2024 |
| Apex Roofing & Construction (Yorkshire) Limited | Construction | 2023 |
| Apex Sourcing Group Limited | Wholesale & retail | 2025 |
| Apex Specialist Spray Coatings Ltd | Construction | 2026 |
| Apex Sport and Leisure Management Limited | Education | 1997 |
| Apex Worksurfaces Ltd | Professional & scientific | 2025 |
| APG Imports Limited | Wholesale & retail | 2023 |
| APH (York) Ltd | Real estate | 2026 |
| APH Investment Company Limited | Financial services | 2025 |
| Aphi Consultants Limited | Other services | 2018 |
| APJ Attractions Ltd | Arts & recreation | 2025 |
| Apletri Limited | Financial services | 2021 |
| Apollo Care 24/7 Limited | Health & social care | 2019 |
| Apollo Invest Ltd | Real estate | 2019 |
| Apothem Limited | Professional & scientific | 2010 |
| App Group Holdings Limited | Real estate | 2022 |
| App Yorkshire Ltd | Real estate | 2008 |
| App.Dayfive Ltd | Information & communication | 2025 |
| Appario Group Limited | Construction | 2021 |
| Appealing Properties Limited | Real estate | 2009 |
| Appedge Ltd | Information & communication | 2022 |
| Appenzeller Properties Ltd | Real estate | 2017 |