| Arch Properties(Hounslow) Limited | Real estate | 2015 |
| Archa Estate Ltd | Real estate | 2022 |
| Architech 2 Engineering Ltd | Professional & scientific | 2024 |
| Arco Projects Limited | Real estate | 2004 |
| Areis NET0PM Services Ltd | Administrative & support | 2022 |
| Arena R Property Ltd | Real estate | 2024 |
| Arena X Ltd | Arts & recreation | 2025 |
| Arganelle Cosmetics Ltd | Wholesale & retail | 2026 |
| ARH Builder Ltd | Construction | 2025 |
| Ariana Express Ltd | Administrative & support | 2011 |
| Ariana Hijama (Cupping) Therapy Ltd | Health & social care | 2021 |
| Ariba Chauffeurs Limited | Other services | 2014 |
| Ariba Impex UK Ltd | Other services | 2017 |
| Arif Property Investments Ltd | Real estate | 2022 |
| Arifeen & Co Limited | Health & social care | 2013 |
| Arihant Property Services Limited | Real estate | 2025 |
| Arise Assets Ltd | Real estate | 2026 |
| Arise Global Consulting Ltd | Professional & scientific | 2026 |
| Arise Services Ltd | Information & communication | 2021 |
| Arish Limited | Real estate | 2003 |
| Aristos Bedroom & Kitchen Limited | Manufacturing | 2022 |
| Ariya Enterprises Ltd | Professional & scientific | 2022 |
| Ariyan Foods Limited | Wholesale & retail | 2012 |
| Arjj Skincare Ltd | Other services | 2023 |
| ARK Financial Ltd | Real estate | 2025 |
| Arka PVT Ltd | Health & social care | 2021 |
| Arkay Commercial Real Estate Limited | Real estate | 2012 |
| Arkay Investments Limited | Real estate | 2009 |
| Arlington Park Investment Five Limited | Real estate | 2026 |
| Arlington Park Investment Four Limited | Real estate | 2026 |
| Arlington Park Investment One Limited | Real estate | 2026 |
| Arlington Park Investment Three Limited | Real estate | 2026 |
| Arlington Park Investment Two Limited | Real estate | 2026 |
| Arminius Security Ltd | Public administration | 2023 |
| Armorix Security Ltd | Administrative & support | 2025 |
| Arnet Systems UK Limited | Wholesale & retail | 2023 |
| Arnies Supplements Ltd | Wholesale & retail | 2018 |
| Arokya Matha Limited | Hospitality | 2023 |
| Arokya Matha Lounge Limited | Hospitality | 2023 |
| Aroma Coffee London Ltd | Hospitality | 2010 |
| Aroma Fresh Fruit and VEG Ltd | Wholesale & retail | 2023 |
| Aromech Ltd | Wholesale & retail | 2020 |
| Arooj Associates Ltd | Real estate | 2023 |
| Aroojali Ltd | Wholesale & retail | 2023 |
| Arora & Arora Properties Limited | Real estate | 2022 |
| Arora (Bedfont Court) Limited | Financial services | 2026 |
| Arora (Gatwick) North Holdings Limited | Financial services | 2026 |
| Arora (Serviced Offices) Limited | Real estate | 2026 |
| Arora Accessories Limited | Wholesale & retail | 2022 |
| Arora Care Group Limited | Health & social care | 2020 |
| Arora Crawley Retail Limited | Real estate | 2022 |
| Arora Developments Ltd | Extraterritorial | 1999 |
| Arora Dublin T2 Limited | Hospitality | 2019 |
| Arora Earleywood Limited | Real estate | 2023 |
| Arora Enterprises Ltd | Wholesale & retail | 2017 |
| Arora EV Charging Limited | Real estate | 2022 |
| Arora Finance Limited | Extraterritorial | 2006 |
| Arora Gatwick Ltd | Hospitality | 2000 |
| Arora Gatwick Property Limited | Real estate | 2000 |
| Arora Hammersmith Limited | Financial services | 2025 |
| Arora Hammersmith Metro Limited | Financial services | 2025 |
| Arora Heathrow Holdings Limited | Real estate | 2009 |
| Arora Heathrow Investments Limited | Extraterritorial | 2006 |
| Arora Heathrow Limited | Financial services | 2025 |
| Arora Heathrow T5 Limited | Real estate | 2004 |
| Arora Holdings Limited | Professional & scientific | 2012 |
| Arora Hotels Limited | Financial services | 2005 |
| Arora Investments Jput Limited | Financial services | 2006 |
| Arora Investments Limited | Professional & scientific | 2011 |
| Arora Kensington Limited | Construction | 2017 |
| Arora Land Ltd | Real estate | 2024 |
| Arora Leased Hotels Limited | Hospitality | 2005 |
| Arora Management Services Limited | Professional & scientific | 2005 |
| Arora Manchester Limited | Extraterritorial | 2004 |
| Arora Metro Investor Limited | Financial services | 2025 |
| Arora Metro Property Limited | Real estate | 2025 |
| Arora Metro Space Limited | Real estate | 2025 |
| Arora Parking 1 Limited | Real estate | 2024 |
| Arora Parking 2 Limited | Real estate | 2024 |
| Arora Property Holdings Ltd | Real estate | 2026 |
| Arora Property Investments Holdings Limited | Financial services | 2026 |
| Arora SLG Limited | Hospitality | 2019 |
| Arora ST James Propco Limited | Real estate | 2000 |
| Arora Superstore Ltd | Wholesale & retail | 2020 |
| Arora T5 Holdings Limited | Professional & scientific | 2016 |
| Arora Tower Limited | Financial services | 2025 |
| Arora UK Finance Limited | Financial services | 2021 |
| Arora Waterfront Developments Limited | Other services | 2020 |
| Arora Waterfront Holdings Limited | Financial services | 2020 |
| Arora Waterfront Limited | Other services | 2020 |
| Arora Woking Retail Limited | Real estate | 2022 |
| Arora Woking Retail Store 2 Limited | Real estate | 2022 |
| Aroras Hair and Beauty Ltd | Other services | 2024 |
| ARP Real Estate (Liverpool 3) Limited | Real estate | 2022 |
| ARP Real Estate (Liverpool 4) Limited | Real estate | 2022 |
| ARP Real Estate (Liverpool) Limited | Real estate | 2021 |
| ARP Real Estate Limited | Real estate | 2019 |
| ARP Services Limited | Transport & logistics | 2022 |
| Arralehas Ltd | Wholesale & retail | 2022 |
| Arrival Mega Store Ltd | Wholesale & retail | 2023 |