| AR Alliance Ltd | Truro | 2019 |
| AR Associates Ltd | Morden | 2016 |
| AR Assured Investmant Limited | Ilford | 2026 |
| AR Boyd Holdings Limited | Dundee | 2023 |
| AR Commercial Finance Limited | Southsea | 2016 |
| AR Controls Holdings Limited | Sunderland | 2024 |
| AR Development Investments Limited | London | 2019 |
| AR DON Holdings Ltd | Sheffield | 2026 |
| AR EOT Holdings Ltd | Welwyn Garden City | 2024 |
| AR Equity Investment Ltd | Edinburgh | 2022 |
| AR Finance Limited | Dundee | 2024 |
| AR Financial & Payroll Services Limited | Stalybridge | 2014 |
| AR Financial Advice Limited | Ashby-De-La-Zouch | 2019 |
| AR Financial Options Limited | London | 2018 |
| AR Global Investment Group Ltd | London | 2024 |
| AR Health BR Ltd | Hatfield | 2022 |
| AR Holdco 2022 Limited | London | 2022 |
| AR Holdco Limited | London | 2025 |
| AR Holdings 24 Limited | Stafford | 2023 |
| AR Holdings and Investments Ltd | Rotherham | 2026 |
| AR Holdings Investments Ltd | Purley | 2025 |
| AR Holdings Leicester Limited | Leicester | 2025 |
| AR Holdings Midlands Ltd | Dudley | 2023 |
| AR Jones Holdings Ltd | Dronfield | 2023 |
| AR Maidstone Holdco Ltd | London | 2026 |
| AR Maidstone Midco Ltd | London | 2026 |
| AR Mortgage Services Limited | Watford | 2015 |
| AR Mortgage Solutions Ltd | Cwmbran | 2019 |
| AR Moulding Limited | Corby | 2026 |
| AR Pension Trustees Limited | Leicester | 2000 |
| AR Pensions Ltd | Bolton | 2019 |
| AR Property Solutions Ltd | Bolton | 2023 |
| AR Razzaq Investments Ltd | Dewsbury | 2026 |
| AR Sandhu Investment Ltd | Ilford | 2022 |
| AR Smiles Holdings Limited | London | 2023 |
| AR Spiers Holdings Limited | West Malling | 2022 |
| AR Technology Group Ltd | Rochdale | 2025 |
| AR Trading Group Limited | Solihull | 2024 |
| AR Wealth Limited | London | 2024 |
| AR Worldwide Services Ltd | Harrow | 2019 |
| AR Wright Holdings Ltd | Daventry | 2025 |
| Ar&M Investment Holdings Ltd | Middlesbrough | 2024 |
| Ar'Wah Housing Holdings Ltd | Coventry | 2025 |
| Ar-Na Holdings Group Ltd | London | 2026 |
| Ar-Razzaq Investing Limited | Manchester | 2023 |
| AR05 CON Limited | Ormskirk | 2023 |
| ARA Advisers (UK), Ltd | London | 2023 |
| ARA European Active Real Estate General Partner Limited | London | 2007 |
| ARA Holdings (NW) Limited | Stockport | 2024 |
| ARA Holdings (UK) Limited | Dewsbury | 2013 |
| ARA Homes Group Limited | Loughton | 2022 |
| ARA Initial II Limited | Fareham | 2025 |
| ARA Initial Limited | Whiteley, Fareham | 2014 |
| ARA Pacis Ltd | London | 2024 |
| ARA25 Investments Limited | London | 2025 |
| Araali and Sons Holding Company Limited | Cardiff | 2025 |
| Arab Intelligence & Creativity Award Ltd | Folkestone | 2024 |
| Arab-African Investors Organization Ltd | London | 2026 |
| Araban 1905 Ltd | Waltham Abbey | 2023 |
| Arabesque AI Ltd | London | 2019 |
| Arabesque Asset Management Ltd | London | 2013 |
| Arabesque Holding Ltd | London | 2013 |
| Arabesque Investment AI Limited | London | 2022 |
| Arabesque Investment Limited | London | 2022 |
| Arabian Gulf Commodities Ltd | London | 2025 |
| Arabian Stallion Venture Group Ltd | London | 2026 |
| Aracap Corporate Limited | London | 2021 |
| Aracas Investments Ltd | Brentwood | 2021 |
| Araceae Capital Ltd | London | 2022 |
| Arachas Topco Limited | London | 2017 |
| Arachne Bidco (UK) Limited | West Malling, Kent | 2021 |
| Arachne Holdco (UK) Limited | West Malling, Kent | 2021 |
| Arachne Midco (UK) Limited | West Malling, Kent | 2022 |
| Arachne Nomineeco (UK) Limited | West Malling, Kent | 2022 |
| Araco Ltd | Northampton | 2022 |
| Arada Holdings Limited | Axminster | 2019 |
| Arada London Ltd | London | 2017 |
| Aradore Holdings Limited | Leeds | 2024 |
| Araemo Financial Ltd | Hereford | 2019 |
| Arag Legal Expenses Insurance Company Limited | Caerphilly | 1909 |
| Arag PLC | Caerphilly | 1991 |
| Aragata Holding Ltd | London | 2025 |
| Aragon Advisory Services Ltd | Lingfield | 2017 |
| Arah WE DID IT Ltd | Norwich | 2022 |
| Arajam Ltd | Oxford | 2026 |
| Arajet UK Limited | London | 2021 |
| Arak Properties and Business Ltd | Manchester | 2025 |
| Araka Holdco 5 Limited | Cheltenham | 2021 |
| Araka Holdco 6 Limited | Cheltenham | 2021 |
| Araka Investco 5 Limited | Cheltenham | 2021 |
| Araka Investco 6 Limited | Cheltenham | 2021 |
| Arakoola Investments Limited | Godalming | 2026 |
| Araldo Holdings Limited | Alton | 2025 |
| Aram Consultants Limited | Harrow | 2023 |
| Aram Family Holdings Limited | Barnstaple | 2016 |
| Aramark CCT Trustees Limited | London | 2006 |
| Aramark Trustees Limited | London | 1980 |
| Aramaz Holding Limited | Waltham Cross | 2025 |
| Aramco Downstream United Kingdom Ltd. | London | 2025 |
| Aramco GAS UK GP Ltd. | London | 2025 |