| Apexcore Global Ltd | Wholesale & retail | 2026 |
| Apfm Projects Limited | Construction | 2020 |
| APG Automotive Ltd | Extraterritorial | 2014 |
| Aphrodite Suites HD1 Limited | Hospitality | 2025 |
| Aphrodite Suites Huddersfield Ltd | Hospitality | 2020 |
| Apiary Trading Ltd | Wholesale & retail | 2022 |
| Apion AI Ltd | Information & communication | 2025 |
| Apitronix Semiconductor Ltd | Administrative & support | 2024 |
| APKSM-PHARM786 Ltd | Wholesale & retail | 2018 |
| Aplus Rentals Ltd | Real estate | 2025 |
| Apocalypse Nutrition Ltd | Wholesale & retail | 2024 |
| Apollo Business Systems Consultancy Limited | Professional & scientific | 2018 |
| Apollo Electronics Corporation Limited | Manufacturing | 2003 |
| Apparel Monkey Ltd | Wholesale & retail | 2026 |
| Appdetex Limited | Wholesale & retail | 2019 |
| Applause Theatreworks Ltd | Arts & recreation | 2020 |
| Apple Daisies Ltd | Professional & scientific | 2020 |
| Applegate Property Sales Limited | Real estate | 2013 |
| Applewood Weddings Ltd | Other services | 2017 |
| Applied Digital Marketing Limited | Professional & scientific | 2015 |
| Apply Minds Limited | Information & communication | 2020 |
| APPOINTMENTS4U Limited | Other services | 2016 |
| Approved Properties(Uk) Ltd | Real estate | 2024 |
| Appscenic Ltd | Information & communication | 2020 |
| Apptology Limited | Information & communication | 2021 |
| Appyco Ltd | Wholesale & retail | 2021 |
| Apricus Consultancy Limited | Professional & scientific | 2020 |
| Aprium Global Limited | Wholesale & retail | 2023 |
| APT4 Limited | Real estate | 2023 |
| Aptec Industries Limited | Professional & scientific | 2009 |
| Aptec Renewables Limited | Professional & scientific | 2010 |
| Apurba Software Consultancy Limited | Information & communication | 2020 |
| AQ Rides Ltd | Transport & logistics | 2025 |
| Aqeel Property Investments Limited | Real estate | 2025 |
| Aqeel Property Limited | Real estate | 2024 |
| AQI Realty Ltd | Real estate | 2025 |
| Aqua Air Limited | Manufacturing | 1994 |
| Aqua Plumbing Ltd | Wholesale & retail | 2018 |
| Aquae Plumb Solutions Ltd | Construction | 2026 |
| Aqualine Ltd | Wholesale & retail | 2007 |
| Aquarius Export Containers Limited | | 1969 |
| Aquatrax Limited | Information & communication | 2019 |
| Aquilo Recruitment Limited | Administrative & support | 2021 |
| AR BD Property Limited | Real estate | 2025 |
| AR Building Maintenance Ltd | Construction | 2021 |
| AR Events Limited | Arts & recreation | 2009 |
| AR Geo-Environmental Ltd | Professional & scientific | 2018 |
| AR Global Supplies Limited | Wholesale & retail | 2019 |
| AR Rahman P Ltd | Wholesale & retail | 2023 |
| AR Rahman Trading Limited | Wholesale & retail | 2022 |
| AR Rides Ltd | Transport & logistics | 2025 |
| AR9 Properties Ltd | Real estate | 2025 |
| Arabiyat Urology Ltd | Health & social care | 2026 |
| Araf Ltd | Real estate | 2024 |
| Arahs Ltd | Wholesale & retail | 2022 |
| Aran.Dev Ltd | Information & communication | 2020 |
| Aranga Ltd | Real estate | 2022 |
| Aranvale Care Group Ltd | Financial services | 2025 |
| Aranvale Living Ltd | Health & social care | 2025 |
| Aranvale Properties Ltd | Real estate | 2025 |
| Arayz Ltd | Health & social care | 2024 |
| Arbour Trade Recruitment Limited | Administrative & support | 2023 |
| ARC Commercial Estates Limited | Real estate | 2023 |
| ARC Records Limited | Information & communication | 2025 |
| ARC Residential Estates Limited | Real estate | 2018 |
| Arcade Marsden Ltd | Hospitality | 2020 |
| Arcade Strategies Limited | Information & communication | 2017 |
| Arcadebreakfast Limited | Hospitality | 2026 |
| Arcadia Property Investment Group Limited | Real estate | 2026 |
| Arcadius Ltd | Wholesale & retail | 2024 |
| Arcform Holdings Limited | Real estate | 2021 |
| Architectural Aluminium Systems Limited | Manufacturing | 2020 |
| Architectural Suppliers Ltd | Construction | 2014 |
| Arctic Foods Huddersfield Ltd | Wholesale & retail | 2019 |
| Arctic Parade Ltd | Information & communication | 2026 |
| Arden Brand Ltd | Professional & scientific | 2025 |
| Ardenmere Advisory Ltd | Professional & scientific | 2026 |
| Ardenpark Solutions Ltd | Administrative & support | 2014 |
| Ardour Energy Limited | Construction | 2016 |
| Areera Compliance Solutions Limited | Other services | 2024 |
| Areoi Limited | Professional & scientific | 2020 |
| ARF Services Limited | Construction | 2015 |
| Arfalah Ltd | Wholesale & retail | 2023 |
| Ariadni Consultants Ltd | Construction | 2023 |
| Arian Motors Ltd | Wholesale & retail | 2025 |
| Ariana Pizza Ltd | Hospitality | 2023 |
| Arianrhod Medical Limited | Health & social care | 2010 |
| Aridus Ltd | Construction | 2025 |
| Aries Associates Ltd | Administrative & support | 2015 |
| Aries Consultancy Ltd | Professional & scientific | 2023 |
| Aries Properties Limited | Real estate | 1993 |
| Arif Enterprises Limited | Administrative & support | 2017 |
| Ariias Ltd | Health & social care | 2024 |
| Arios (Huddersfield) Limited | Wholesale & retail | 2018 |
| Aris Property Limited | Real estate | 2017 |
| Arising Security Limited | Administrative & support | 2024 |
| ARK Digital Ltd | Professional & scientific | 2018 |
| ARK Windows Ltd | Construction | 2025 |
| ARM Digital, Cloud & IT Advisory Ltd | Information & communication | 2017 |
| ARM Store Ltd | Wholesale & retail | 2024 |