| Argot Properties Limited | Extraterritorial | 1988 |
| Arguk Distribution Ltd | Wholesale & retail | 2023 |
| Argus Services Ltd | Administrative & support | 1999 |
| Argyl Group Limited | Hospitality | 2021 |
| Argyl Student Limited | Real estate | 2026 |
| ARH Bham Ltd | Education | 2021 |
| ARH Haulage Ltd | Transport & logistics | 2024 |
| ARH Limited | Manufacturing | 2022 |
| ARH Optics Ltd | Health & social care | 2023 |
| ARH Services Ltd | Administrative & support | 2026 |
| Arha Holdings Ltd | Financial services | 2025 |
| Arhm Associates Ltd | Administrative & support | 2013 |
| Arhouse Group Ltd | Financial services | 2025 |
| Arhsham Ltd | Professional & scientific | 2022 |
| ARI Supermarket Limited | Wholesale & retail | 2026 |
| Aria 36 Limited | Transport & logistics | 2025 |
| Aria Beauty Salon Limited | Other services | 2018 |
| Aria Housing Ltd | Real estate | 2020 |
| Aria IT Solutions Ltd | Information & communication | 2019 |
| Aria Physiocare Ltd | Health & social care | 2020 |
| Aria Sale Ltd | Wholesale & retail | 2019 |
| Aria Trading Ltd | Wholesale & retail | 2026 |
| Ariag Limited | Real estate | 2023 |
| Ariana Commerce LP | | 2015 |
| Ariana Fresh Naan Ltd | Wholesale & retail | 2025 |
| Ariana Legal & Business Ltd | Administrative & support | 2023 |
| Ariana Superstore 2 Ltd | Wholesale & retail | 2024 |
| Ariana Wholesale Limited | Wholesale & retail | 2010 |
| Ariatics Limited | Administrative & support | 2024 |
| Ariavani Ltd | Real estate | 2023 |
| Ariecan Ltd | Health & social care | 2016 |
| Ariecan Property Ltd | Real estate | 2022 |
| Ariel House (Sheldon) Limited | Real estate | 2023 |
| Ariel-Daniel Ltd | Health & social care | 2020 |
| Aries Autocare Limited | Wholesale & retail | 2024 |
| Aries Entertainment Ltd | Arts & recreation | 2008 |
| ARIEZ3 Group Holdings Limited | Real estate | 2020 |
| Arif Associates Ltd | Real estate | 2023 |
| Arif Housing Ltd | Real estate | 2020 |
| Arif Logistics Limited | Transport & logistics | 2016 |
| Arif Rahman Ltd | Professional & scientific | 2022 |
| Arify Ltd | Transport & logistics | 2022 |
| Ariha & Sons Ltd | Transport & logistics | 2022 |
| Arii Fades Ltd | Other services | 2025 |
| Arikoh Enterprises Limited | Wholesale & retail | 2024 |
| Arikson Group Limited | Other services | 2019 |
| Arim Tech Limited | Information & communication | 2019 |
| Arintoro Ltd | Financial services | 2024 |
| Arion Business Centre Ltd | Real estate | 2010 |
| Ariosi Ltd | Information & communication | 2022 |
| Arira Ltd | Professional & scientific | 2024 |
| Aris Flooring Ltd | Administrative & support | 2017 |
| Aris House Ltd | Wholesale & retail | 2026 |
| Arise Cargo and Allied Services Ltd | Transport & logistics | 2022 |
| Arise Civils Limited | Construction | 2025 |
| Arise Housing Services Limited | Real estate | 2024 |
| Arise International Limited | Real estate | 2003 |
| Arise Ventures Ltd | Financial services | 2013 |
| Arise-Shine Community Studio CIC | Health & social care | 2025 |
| Arishu Films Ltd | Information & communication | 2025 |
| Ariso Capital Ltd | Real estate | 2026 |
| Ariso Group Ltd | Real estate | 2026 |
| Arista Design Ltd | Construction | 2014 |
| Aristeia Academy Ltd | Education | 2020 |
| Aristi Limited | Information & communication | 2008 |
| Aristo Intelligence Ltd | Information & communication | 2025 |
| Ariton Transport Ltd | Transport & logistics | 2019 |
| Arivoli Ltd | Construction | 2013 |
| Arivon Limited | Other services | 2021 |
| Ariya Haulage Ltd | Wholesale & retail | 2022 |
| Ariya Transport Limited | Transport & logistics | 2021 |
| Ariyan Developments Limited | Real estate | 2023 |
| ARJ Estates Ltd | Real estate | 2025 |
| Arjan Consulting Limited | Information & communication | 2010 |
| Arjan Meat Market Ltd | Wholesale & retail | 2025 |
| Arjin & Brothers Ltd | Other services | 2018 |
| Arjin Power Ltd | Other services | 2025 |
| Arjun Dental Limited | Health & social care | 2022 |
| ARK 29 Limited | Transport & logistics | 2021 |
| ARK Agency Network Ltd | Arts & recreation | 2025 |
| ARK and Sons Ltd | Real estate | 2024 |
| ARK Assessments Ltd | Education | 2018 |
| ARK Associates Ltd | Extraterritorial | 2013 |
| ARK Care (UK) Limited | Wholesale & retail | 2013 |
| ARK Construct Ltd | Construction | 2026 |
| ARK Consultancy Limited | Professional & scientific | 2016 |
| ARK Developments Limited | Real estate | 2017 |
| ARK Education Services Limited | Education | 2016 |
| ARK Estate Ltd | Real estate | 2017 |
| ARK Global Wealth Ltd | Professional & scientific | 2015 |
| ARK Housing & Support Ltd | Hospitality | 2023 |
| ARK Housing Group Ltd | Real estate | 2019 |
| ARK Indian Dining and Bar Limited | Hospitality | 2020 |
| ARK Investment Midlands Ltd | Real estate | 2022 |
| ARK Optical Ltd | Health & social care | 2024 |
| ARK Real Estate Group Ltd | Extraterritorial | 2024 |
| ARK Sodha Dental Practice Limited | Health & social care | 2019 |
| ARK Sodha Limited | Real estate | 2015 |
| ARK Supply Group Ltd | Wholesale & retail | 2026 |
| Arka Build Ltd | Construction | 2025 |