| Arian Consulting Ltd | Christchurch | 2013 |
| Arian EMS Group Finance Limited | Altrincham | 2025 |
| Arian EMS Group Holdings Limited | Altrincham | 2025 |
| Arian Finance Limited | Newport | 1995 |
| Arian Financial Planning Ltd | Llanelli | 2011 |
| Arian Holdings Limited | Walton-On-Thames | 2026 |
| Arian Investment Group Limited | Walsall | 2021 |
| Ariana Business Limited | London | 2012 |
| Ariana Capital Global Ltd | Ruislip | 2026 |
| Ariana Capital Ltd | London | 2019 |
| Ariana Exchange Limited | Thornton Heath | 2006 |
| Ariana Finance Group Limited | Southall | 2014 |
| Arianty Holdings Limited | Solihull | 2000 |
| Arianty NO. 1 PLC | Solihull | 2000 |
| Ariapour Ltd | Hornchurch | 2024 |
| Ariath Holdings Ltd | London | 2023 |
| Aribeonaty Holdings Limited | Exeter | 2023 |
| Aribin Limited | London | 2016 |
| Aridia Ltd | London | 2025 |
| Ariel (U.K.) Limited | Hampshire | 1971 |
| Ariel Bidco Limited | Chelmsford | 2026 |
| Ariel Corporate Holdings (NO 1345) Limited | London | 2025 |
| Ariel Corporate Member (NO 1345) Limited | London | 2020 |
| Ariel Finance Limited | Swansea | 1982 |
| Ariel Green Holdings Limited | London | 2026 |
| Ariel Midco Limited | Chelmsford | 2026 |
| Ariel RE Capital Holdings (NO 1345) Limited | London | 2020 |
| Ariel RE Capital Holdings (NO 1350) Limited | London | 2022 |
| Ariel RE Managing Agency Limited | London | 2021 |
| Ariel RE Services Holdings (NO 1355) Limited | London | 2020 |
| Ariel RE UK Limited | London | 2020 |
| Ariel Topco Limited | Chelmsford | 2026 |
| Ariella Holding Limited | Rochester | 2024 |
| Aries 76 Ltd | London | 2023 |
| Aries Capital Holdings Limited | London | 2026 |
| Aries Holdings Group Ltd | Loanhead | 2020 |
| Aries Investments Two Limited | Milton Keynes | 2019 |
| Aries Partners Limited | London | 2026 |
| Aries Vision Limited | London | 2018 |
| Aries Wealth Management Limited | Harrogate | 2017 |
| ARIES1964 Limited | Addlestone | 2026 |
| Arif Holdings (UK) Limited | London | 2013 |
| Arif's Holdings Limited | Stoke-On-Trent | 2024 |
| Arigal FS Limited | Edgware | 2014 |
| Arighi Bianchi General Partner Limited | Edinburgh | 2018 |
| Arighi Bianchi Pension Trustees Limited | London | 2018 |
| Arilee Irel Limited | London | 2022 |
| Arima Financial Limited | London | 2023 |
| Arima Mortgages Holdings Limited | London | 2023 |
| Arima Mortgages PLC | London | 2023 |
| Ariman Ltd | Edinburgh | 2021 |
| Arina Holdings Ltd | Coulsdon | 2025 |
| Arini Capital Management Limited | Oxfordshire | 2022 |
| Arintoro Ltd | Birmingham | 2024 |
| Arinve Limited | Aberdeen | 2016 |
| Ario Advisory Limited | Bicester | 2016 |
| Ario Healthcare Limited | London | 2024 |
| Ariol Ltd | London | 2023 |
| Ariolus Ltd | London | 2012 |
| Arion Business Holdings Limited | London | 2025 |
| Arion Investment Management Limited | London | 2016 |
| Arioste Capital Limited | Cardiff | 2023 |
| Arira Holdings Limited | London | 2015 |
| Arirma Ltd | Folkestone | 2022 |
| Arisaig Holdings Ltd | Motherwell | 2022 |
| Arisaig Marine (Holdings) Limited | Mallaig | 2023 |
| Arisal Asset Group Ltd | Sawbridgeworth | 2019 |
| Ariscroft Limited | Chichester | 2011 |
| Arise Financial Limited | Wingate | 2020 |
| Arise M Limited | London | 2024 |
| Arise Mortgages Ltd | Newcastle Upon Tyne | 2026 |
| Arise P&L Africa 1 Limited | London | 2019 |
| Arise P&L Gabon Limited | London | 2019 |
| Arise P&L Limited | London | 2019 |
| Arise Pharma Ltd | Harrow | 2013 |
| Arise Ventures Ltd | Birmingham | 2013 |
| Arisiva Limited | London | 2025 |
| Ariss Limited | Isleworth | 2008 |
| Arissa Lifestyle Protection Specialists Ltd | Gateshead | 2021 |
| Arisse Holdings Ltd | Hanwell | 2023 |
| Arista (UK) Holdings Ltd | Colne | 2025 |
| Arista Capital (UK) Ltd | London | 2012 |
| Aristata Capital Limited | London | 2018 |
| Aristera Holdings Limited | Bracknell | 2018 |
| Aristo (Catering) Limited | Royston | 1939 |
| Aristo Health Ltd | Bournemouth | 2019 |
| Aristocracy Ltd | Brighouse | 2026 |
| Aristocrat AG UK Ltd | London | 2022 |
| Aristocrat Homes Ltd | London | 2018 |
| Aristocrat Investments Holding Company Limited | London | 2020 |
| Aristocrat Property Holdings Limited | London | 2010 |
| Aristocrat SS Ltd | Colliers Wood | 2023 |
| Aristocrite Limited | Kington | 2005 |
| Ariston Capital Limited | London | 2017 |
| Ariston Property Investments Ltd | Stockton-On-Tees | 2025 |
| Aristophanes Limited | London | 2022 |
| Aristotle Financial Planning Ltd | Derby | 2017 |
| Aristotle International Europe Limited | London | 2003 |
| Aristotle Midco Limited | London | 2023 |
| Aristotle Newco Limited | London | 2023 |