| Arka Builders Ltd | Construction | 2020 |
| Arka Group Ltd | Professional & scientific | 2018 |
| Arkad Group Ltd | Professional & scientific | 2014 |
| Arkadia Investments Limited | Real estate | 2024 |
| Arkakos Ltd | Transport & logistics | 2014 |
| Arkan Holdings Ltd | Financial services | 2023 |
| Arkana DE Facto Limited | Wholesale & retail | 2024 |
| Arkana Services Limited | Professional & scientific | 2025 |
| Arkdem Limited | Households | 2018 |
| Arkfreight Limited | Transport & logistics | 2022 |
| Arkful Ltd | Professional & scientific | 2021 |
| Arkhamconsultants.Com Limited | Other services | 2015 |
| Arki's Fish Bar Limited | Hospitality | 2012 |
| Arki-Tekt Partnership Investments Ltd | Construction | 2022 |
| Arkid Food Group Ltd | Hospitality | 2024 |
| Arkinstall Galvanizing Limited | Manufacturing | 2008 |
| Arkinstall Services Ltd | Construction | 2016 |
| Arkk Estates Ltd | Households | 2024 |
| Arkle Court (Apartment Block) Management Company Limited | Real estate | 2026 |
| Arkle Court Cheltenham Management Company Limited | Real estate | 2025 |
| Arkles Stores Ltd | Wholesale & retail | 2003 |
| Arkley Gardeners Ltd | Other services | 2025 |
| Arknet Couriers Ltd | Transport & logistics | 2024 |
| Arkomet Ltd | Information & communication | 2025 |
| Arkonpet Ltd | Wholesale & retail | 2026 |
| Arkridge Asset Management Ltd | Financial services | 2026 |
| Arksense Limited | Information & communication | 2011 |
| Arkstone Property Investment Ltd | Real estate | 2022 |
| Arkti RE Consulting Ltd | Real estate | 2026 |
| Arktri Housing Ltd | Real estate | 2025 |
| ARL & Main Real Estate Limited | Real estate | 2024 |
| ARL Mart Ltd | Wholesale & retail | 2026 |
| Arlano Ltd | Information & communication | 2025 |
| Arleicester Inc Ltd | Wholesale & retail | 2025 |
| Arlex Limited | Financial services | 2013 |
| Arley Primary Care Services Limited | Wholesale & retail | 2010 |
| Arlishaan Ltd | Professional & scientific | 2025 |
| ARM Craft UK Limited | Wholesale & retail | 2021 |
| Armaan Collections Ltd | Wholesale & retail | 2023 |
| Armaan Designer Ltd | Wholesale & retail | 2026 |
| Armaan INT Ltd | Wholesale & retail | 2019 |
| Armaan Legal Support Services CIC | Public administration | 2025 |
| Armac Manufacturing (Brassfounders) Limited | Manufacturing | 1978 |
| Armadale Properties Limited | Construction | 1988 |
| Armafield Limited | Households | 1992 |
| Armagard Holdings Ltd | Financial services | 2021 |
| Armagard Limited | Manufacturing | 2005 |
| Armal Motors Ltd | Wholesale & retail | 2022 |
| Armal Rentals Ltd | Administrative & support | 2025 |
| Arman Brothers Ltd | Wholesale & retail | 2016 |
| Arman Investments Ltd | Real estate | 2019 |
| Arman Trading Limited | Wholesale & retail | 2020 |
| Armani & Sons Ltd | Wholesale & retail | 2025 |
| Armani A1 Supermarket Limited | Wholesale & retail | 2025 |
| Armani A2 General Store Limited | Wholesale & retail | 2025 |
| Armani A3 Superstore Limited | Wholesale & retail | 2026 |
| Armani Caffe & Grill House Limited | Hospitality | 2021 |
| Armani Care Ltd | Health & social care | 2023 |
| Armann Transport Ltd | Transport & logistics | 2017 |
| Armans Good Ltd | Wholesale & retail | 2026 |
| Armarium Security Ltd | Administrative & support | 2018 |
| Armarox Limited | Wholesale & retail | 2025 |
| Armi Steel Ltd | Construction | 2021 |
| Armin Landis Consulting Limited | Information & communication | 2024 |
| Armin Landis Limited | Real estate | 2019 |
| Arminshafa Property Ltd | Real estate | 2018 |
| Armita Global Ltd | Extraterritorial | 2013 |
| Armitage Motors Ltd | Wholesale & retail | 2025 |
| Armley HA Ltd | Real estate | 2024 |
| Armm Investment Limited | Real estate | 2019 |
| Armm Ventures Ltd | Real estate | 2024 |
| Armona Beauty Limited | Other services | 2018 |
| Armos Ltd | Manufacturing | 2013 |
| Armouk Ltd | Other services | 2025 |
| Armour Concrete & Liquid Screed Pumping Limited | Construction | 2022 |
| Armoury Motorcycles Ltd | Wholesale & retail | 2022 |
| Arms Properties Limited | Real estate | 2026 |
| Armstrong Build Limited | Construction | 2007 |
| Armstrong Civils Ltd | Construction | 2024 |
| Armstrong Consultancy Services Ltd | Professional & scientific | 2017 |
| Armstrong MEP Limited | Construction | 2020 |
| Armxxnh Limited | Transport & logistics | 2025 |
| Armz-Ageddon Ltd | Wholesale & retail | 2025 |
| ARN Distribution Ltd | Transport & logistics | 2014 |
| ARN Investments Ltd | Real estate | 2025 |
| ARN Legal Limited | Professional & scientific | 2026 |
| ARN Track Ltd | Transport & logistics | 2025 |
| ARN Transport Services Ltd | Transport & logistics | 2025 |
| ARN07D Ltd | Transport & logistics | 2025 |
| Arnam Properties Limited | Construction | 2024 |
| Arnamsco Ltd | Manufacturing | 2024 |
| Arnewoods Limited | Real estate | 2010 |
| Arnia Group Ltd | Financial services | 2026 |
| Arnia Services Ltd | Other services | 2026 |
| Arnold Holdings Limited | Real estate | 2001 |
| Arnold IT Consultancy Ltd | Information & communication | 2024 |
| Arnold Midlands Limited | Real estate | 2024 |
| Arnold Properties (Midlands) Ltd | Construction | 2018 |
| Arnolds Property Ltd | Real estate | 2026 |
| ARO Properties (GB) Ltd | Real estate | 2015 |