| Arete Group Holdings Limited | Brighton | 2024 |
| Arete Holdings Limited | Liverpool | 2020 |
| Arete Investments Limited | London | 2016 |
| Arete Investors 22 (Nominees) Limited | Liverpool | 2021 |
| Arete Midco Limited | Guildford | 2025 |
| Arete Poolingco Limited | Kingston Upon Thames | 2025 |
| Arete Portfolio Ltd | New Malden | 2018 |
| Arete Talent Holdings Ltd | London | 2025 |
| Arete Topco Limited | Guildford | 2025 |
| Areti Holdings Ltd | London | 2023 |
| Areti Mortgages Limited | Bath | 2024 |
| Areti Ventures Ltd | London | 2024 |
| Aretian Capital Limited | Cambridge | 2025 |
| Aretian Wealth Management Limited | London | 2009 |
| Aretis Advisors Limited | Enfield | 2025 |
| Aretoburst Ltd | London | 2025 |
| Aretura Limited | London | 2025 |
| Areva Transport Limited | Swadlincote | 1975 |
| Arew Holdings Limited | Manchester | 2022 |
| Arewapay Ltd | Bristol | 2024 |
| Arewhana Limited | London | 2024 |
| Arezzo Associates Ltd | Malton | 2025 |
| ARF Life and Health Ltd | Nottingham | 2024 |
| Arfa Holdings Ltd | London | 2022 |
| Arfada Ltd | London | 2023 |
| Arfam Investment Company Limited | Bexhill-On-Sea | 2024 |
| Arfan Holdings Ltd | Nottingham | 2024 |
| Arfi Solar Holdings Limited | London | 2025 |
| Arfon Dwyfor Training Limited | Chester | 1983 |
| Arfordir Holdings Ltd | Llandysul | 2015 |
| ARG Insolvency Recoveries Ltd | Buckhurst Hill | 2022 |
| ARG Media Limited | London | 2012 |
| ARG Promotions Holdings Limited | London | 2022 |
| ARG Promotions Property Limited | London | 2022 |
| Arga Holdings Ltd | Birmingham | 2023 |
| Arga Investments Limited | Harrow | 2017 |
| Argaeus Capital Ltd | London | 2020 |
| Argali Resources Limited | London | 2020 |
| Arganta PHG Ltd | Manchester | 2020 |
| Argantis Ltd | Leeds | 2020 |
| Argantis PHG Ltd | Leeds | 2020 |
| Argantos Ltd | Leeds | 2020 |
| Argantos PHG Ltd | Leeds | 2020 |
| Argantus Holdings Ltd. | London | 2025 |
| Argc Topco Limited | London | 2011 |
| Arge Properties Limited | Brentwood | 2025 |
| Argenfall Capital Ltd | London | 2026 |
| Argenix Ltd | Surbiton | 2025 |
| Argent & Partners Limited | London | 2003 |
| Argent Consultancy Services Ltd | Chislehurst | 2024 |
| Argent Desserts Limited | Colchester | 2026 |
| Argent Energy Holdings Limited | London | 2013 |
| Argent Financial Services Limited | Northampton | 1992 |
| Argent Fund Management Limited | London | 1996 |
| Argent Global Partners Limited | London | 2007 |
| Argent Group Holdings Limited | Laindon | 2022 |
| Argent House Wealth Management Limited | Cirencester | 2009 |
| Argent Industrial UK Ltd | Cannock | 2020 |
| Argent Premium Finance Ltd | London | 2005 |
| Argent Wealth Limited | Solihull | 2009 |
| Argent Wealth Management Limited | High Wycombe | 2010 |
| Argenta Holdco Limited | London | 2020 |
| Argenta Midco 2 Limited | London | 2020 |
| Argenta SLP Continuity Limited | Edinburgh | 2004 |
| Argenta Sub-Holding Limited | London | 2017 |
| Argenta Syndicate Management Limited | London | 1998 |
| Argenta Underwriting NO.2 Limited | London | 1994 |
| Argenta Underwriting NO.3 Limited | London | 2005 |
| Argentar Holdings Limited | Worcester | 2018 |
| Argentar Ltd | Worcester | 2016 |
| Argentea Limited | Billericay | 2007 |
| Argentem Creek Partners (UK) Limited | London | 2015 |
| Argentex Capital Limited | London | 2019 |
| Argentex Foreign Exchange Limited | London | 2011 |
| Argentex Group PLC | London | 2019 |
| Argentex Technologies Limited | London | 2023 |
| Argentic Europe Limited | Chelmsford | 2026 |
| Argentil Capital Partners (UK) Limited | London | 2015 |
| Argentina Potassium Limited | Sheffield | 2024 |
| Argentinus International Ltd | London | 2024 |
| Argentis Financial Planning Ltd | Waterlooville | 2008 |
| Argentis Group Ltd | Waterlooville | 2003 |
| Argentis Wealth Management Ltd | Waterlooville | 2001 |
| Argento Capital Markets Limited | Halstead | 2012 |
| Argento Funding Limited | London | 2025 |
| Argento Ltd | London | 2020 |
| Argentous Private Clients Limited | London | 2014 |
| Argentra PLC | St. Helens | 2025 |
| Argents Holdings Ltd | Norwich | 2021 |
| Argentum Capital Ltd | London | 2024 |
| Argentum Finance Ltd | Worksop | 2012 |
| Argentum Financial Advisers Limited | Hemsworth | 2014 |
| Argentum Reset Ltd | Bradford | 2026 |
| Argh Investments Ltd | Dundee | 2024 |
| Arghan Capital Limited | Worthing | 2018 |
| Argilion Holdings Limited | London | 2025 |
| Arglo Limited | Newmarket | 2024 |
| Argo Acquisition Co. Limited | Fareham | 2022 |
| Argo Capital Management Limited | London | 2000 |
| Argo Capital Partners Limited | Bournemouth | 2018 |