| ARU Investments Limited | Warrington | 2019 |
| Arugam Holdings Limited | London | 2024 |
| Aruhi Group Limited | Stanmore | 2026 |
| Arum Global Limited | Bristol | 2017 |
| Arum Solutions Limited | Aldermaston | 2015 |
| Arun 2022 Company | Haywards Heath | 2023 |
| Arun Financial Services Ltd | Nottingham | 2021 |
| Arun Group Holdings Limited | Eastleigh | 2026 |
| Arun Rockall Holdings Limited | Milton Keynes | 2017 |
| Arunan Holdings Ltd | Romford | 2026 |
| Arundel (Bath) Limited | Shaftesbury | 2024 |
| Arundel Analytics Limited | London | 2023 |
| Arundel Collection Limited | Canterbury | 2025 |
| Arundel Gate Finance Limited | Arundel | 2023 |
| Arundel Group Limited | Weybridge | 1992 |
| Arundell Holdings Limited | Atherstone | 2026 |
| Arunvill Global Equity Trading Limited | Cardiff | 2012 |
| Arup Corporate Finance Limited | London | 1989 |
| Arusha Enterprises Ltd | London | 2019 |
| Arusha Finance Limited | London | 2013 |
| Arusha Investments Limited | London | 2013 |
| Arushay Investments Ltd | Romford | 2020 |
| Arutba Ltd | London | 2022 |
| Aruva Limited | Bexhill On Sea | 2019 |
| ARV Holdings Limited | Feltham | 2020 |
| ARV Total Holdings Ltd | Birmingham | 2026 |
| Arva Financial Solutions Ltd | London | 2021 |
| Arval UK Group Limited | Swindon | 1980 |
| Arval UK Limited | Swindon | 1972 |
| Arvandana Holdings Ltd | Harrow | 2025 |
| Arve Global Group Ltd | London | 2025 |
| Arvea Partners Limited | London | 2018 |
| Arven Capital Holdings Limited | Rickmansworth | 2019 |
| Arven Capital Partners Limited | Farnborough | 2018 |
| Arven Finance Limited | Farnborough | 2019 |
| Arven Holdings Group Ltd | Pinner | 2020 |
| Arvento Limited | Bournemouth | 2024 |
| Arvian Limited | London | 2026 |
| Arvifin Solutions Ltd | Stanford-Le-Hope | 2025 |
| Arville Holdings Limited | Wetherby | 2010 |
| Arvind Jobanputra Insurance Services Limited | Harrow | 1984 |
| Arvind Strategic Holdings Limited | Reading | 2025 |
| Arvion Holding Limited | Birmingham | 2026 |
| Arvon Properties Ltd | London | 2020 |
| Arvore Growth Capital Limited | Belfast | 2025 |
| Arvosa Holdings Ltd | Buxted | 2025 |
| Arvus Holdings Limited | Waltham Cross | 2024 |
| Arvut Ltd | London | 2024 |
| ARW Property Company | Ballyclare | 2020 |
| ARW Transformers (Holdings) Limited | Glasgow | 2025 |
| ARW Wealth Management Limited | Chorley | 2012 |
| Arwerthwyr LJ CYF | Llandysul | 2026 |
| Arwh Holdings Limited | Bury | 2018 |
| Arwin Financial Limited | Coventry | 2026 |
| ARX Capital Ltd | London | 2025 |
| ARX Property Group Ltd | Manchester | 2018 |
| ARX Rural Brokers Limited | Edinburgh | 2025 |
| ARX Rural RE Ltd | Edinburgh | 2023 |
| Arxca Ltd | Sale | 2018 |
| Arxco | East Grinstead | 2024 |
| Arxfin Projects Limited | Belfast | 2023 |
| Arxia Holdings Ltd | London | 2017 |
| Arxnova Asset Management Limited | London | 2025 |
| Arxnova Holdings Limited | London | 2025 |
| Arya Capital Investment Ltd | Potters Bar | 2025 |
| Arya Douge Holdings Ltd | London | 2025 |
| Arya Exchange Limited | London | 2018 |
| Arya Holdings Limited | Bicester | 2019 |
| Arya NW Ltd | Warrington | 2024 |
| Arya NYR Ltd | Enfield | 2025 |
| Arya Private Credit Limited | Finchley | 2025 |
| Arya Trading Limited | Bexley | 2022 |
| Aryaan Properties Ltd | London | 2025 |
| Aryabhata Investments Ltd | London | 2024 |
| Aryaman Group Holdings Ltd | Henley-On-Thames | 2025 |
| Aryaman UK Holdings Ltd | Henley-On-Thames | 2025 |
| Aryan & Alya Security Ltd | Borehamwood | 2025 |
| Aryan Property UK Ltd | Harlow | 2022 |
| Arye Finance Ltd | London | 2020 |
| Aryma Holdings Limited | Llandrindod Wells | 2020 |
| Aryo Holdings Ltd | London | 2023 |
| Aryza Holdings Limited | London | 2017 |
| ARZ Holdings Limited | Whitefield | 2024 |
| Arzan Investment Management Limited | London | 2024 |
| AS & AP Consultancy Ltd | Preston | 2022 |
| AS & CJS Group Ltd | Ealing | 2024 |
| AS & EH Industries Limited | London | 2022 |
| AS & Firr Holding Ltd | London | 2016 |
| AS & LS Investments Limited | Ashford | 2023 |
| AS & T Management Limited | Wolverhampton | 2015 |
| AS 2019 Limited | Knutsford | 2019 |
| AS Aura Holdings Ltd | Birmingham | 2025 |
| AS Business Consultants Limited | Wembley | 2003 |
| AS Care Group Limited | Leeds | 2020 |
| AS Collection Limited | Middleton | 2023 |
| AS Commodity Brokerage Ltd | London | 2024 |
| AS Contracting UK Limited | Nottingham | 2013 |
| AS Direct Investments UK Ltd | London | 2022 |
| AS Direct Lending Holdings Limited | London | 2026 |
| AS Direct Property Investments UK Ltd | London | 2025 |