| Arnolds Close Management Limited | Letchworth Garden City | 2021 |
| Arnolds Way Business Park Management Company Limited | Bristol | 2020 |
| Arnolds Way Residents Company Limited | Kidlington | 2019 |
| Arnos Trading Limited | | 1965 |
| Arnside (Chislehurst) Management Company Limited | Chislehurst | 1984 |
| Arnside Court Flat Management (Southport) Limited | | 1986 |
| Arnworth Court (Eastbourne) Management Company Limited | Eastbourne | 2016 |
| Arojas Property Services Ltd | Wembley | 2025 |
| Aron Court Management Company Limited | Shrewsbury | 2002 |
| Aron Properties Limited | Solihull | 2011 |
| Arona House (Oakwood) Management Limited | Croydon | 2010 |
| Arona House Flat Management Company Limited | Staines-Upon-Thames | 2004 |
| Arondene Limited | Croydon | 2001 |
| Aronpark Property Management Limited | | 2000 |
| Aronwood Property Management Limited | | 2001 |
| Aroonvale Limited | Polegate | 1984 |
| Arora Property Developments Ltd | London | 2011 |
| Aros & an Ltd | Wolverhampton | 2025 |
| Arosa Court Management Company Limited | Stockport | 1999 |
| Arosa Mineral Management Company Limited | Carrickfergus | 2006 |
| ARP Homes Ltd | Manchester | 2025 |
| Arpley Street Developments Limited | Manchester | 2022 |
| ARQ Homecare Limited | East Ham | 2020 |
| ARR Property Management Ltd | Newcastle Upon Tyne | 2023 |
| Arr&Cee Ltd | Southall | 2025 |
| Arragon Court Management Limited | Cannock | 2012 |
| Arragon Road Residents Limited | Richmond | 1996 |
| Arrallas Barns Management Company Limited | Truro | 1989 |
| Arran 20 Limited | London | 2008 |
| Arran Gate Limited | Winchester | 1992 |
| Arran Rise Residents Management Company Limited | Newark | 2013 |
| Arran Road Association Ltd | London | 2009 |
| Arrancourt Management Company Limited | Horsham | 1981 |
| Arranmore Court Management Company Limited | Harrow | 1998 |
| Arreton Mead Management Company Limited | Woking | 1998 |
| Arrigo Property Ltd | Glasgow | 2022 |
| Arrina Limited | Carshalton | 2002 |
| Arrival Property Ltd | Glasgow | 2025 |
| Arrival Property Services Ltd | London | 2025 |
| Arrk Investments Ltd | Northwood | 2021 |
| Arrolbeam Management Company Limited | Bognor Regis | 2014 |
| Arron Properties Limited | London | 2023 |
| Arrow Court Management Limited | Leamington Spa | 2003 |
| Arrow Property Maintenance Ltd | Malton | 2013 |
| Arrow Residential Lets Ltd | Glasgow | 2025 |
| Arrowaden Limited | Croydon | 1985 |
| Arrowb 123 Management Company Limited | Birmingham | 2026 |
| Arrowbank Properties Limited | Kington | 2025 |
| Arrowbase Portland Ltd | Dorchester | 2020 |
| Arrowe Brook Court Management Company Limited | Wallasey | 1996 |
| Arrowe Brook Park (Greasby) Residents Management Company Limited | Tarporley | 2021 |
| Arrowgreen View Residents Management Company Limited | Tarporley | 2025 |
| Arrowsong Ltd | Edinburgh | 2023 |
| ARS Letting Agents Limited | Billericay | 2024 |
| Arsalan Limited | London | 2019 |
| Arsber Ltd | Barking | 2018 |
| Arscott Barns Management Limited | Shrewsbury | 2008 |
| Arshad & Sons Limited | Oldham | 2016 |
| Art Deco Apartments Rugby Ltd | Harpenden | 2014 |
| Art House Management Company Limited | Exmouth | 2003 |
| Art of Money Ltd | London | 2023 |
| Arta Residents Management Company Limited | Wallington | 2007 |
| Artasooley Crescent Management Company Limited | Gilford | 2022 |
| Artemis House Management Limited | Milton Keynes | 2017 |
| Artemis Training and Consultancy Limited | Fareham | 2004 |
| Arterberry Mews (Wimbledon) Management Company Limited | London | 2010 |
| Arteseum Ltd | Gravesend | 2016 |
| Artesian Grove Management Company Limited | London Colney | 1996 |
| Artesian House Management Company Limited | London | 1998 |
| Artgrange Limited | Borehamwood | 1993 |
| Arthaus Apts RTM Company Limited | Ticehurst | 2026 |
| Arthington Buildings Management Company Limited | Sheffield | 2015 |
| Arthog Hall Farm Management Company Limited | Arthog | 2007 |
| Arthur Court (Private Block) Management Company Limited | Bromley | 2016 |
| Arthur Court (Pudsey) Management Company Limited | Leeds | 2015 |
| Arthur Court Management Limited | London | 1972 |
| Arthur Court Norman Way Over Management Company Limited | Cambridge | 2017 |
| Arthur Management Limited | Bracknell | 2017 |
| Arthur Morrison Property Ltd | Erith | 2009 |
| Arthur Street (Redditch) Management Limited | Redditch | 1994 |
| Arthur Street Management (Wellingborough) Limited | Northampton | 2011 |
| Arthur Street Management 2012 Limited | Nottingham | 2012 |
| Arthur Street Mews Management Limited | Belfast | 2008 |
| Arthur's Bridge Farm Residents Limited | Langport | 2014 |
| Arthur's Court (Winchester) Ltd | Winchester | 2022 |
| Arthurlaw Ltd | Dundee | 2025 |
| Arthurs Court (Fourmarks) Management Company Limited | Upham | 2004 |
| Arthurs Court Management Company Limited | Glastonbury | 2003 |
| Arthurs Lettings Limited | Hockley | 2022 |
| Arthurs Yard Management Limited | Stonehouse | 2021 |
| Artichoke Management UK Limited | Devizes | 2014 |
| Articulate Radio Ltd | London | 2023 |
| Artillery 88 (Management) Limited | London | 2022 |
| Artillery Court NO 1 Management Limited | Exeter | 2003 |
| Artillery Court NO 2 Management Limited | Exeter | 2003 |
| Artillery House Freehold Limited | Aylesbury | 2025 |
| Artillery House Management Limited | Swindon | 2022 |
| Artillery House RTM Company Ltd | Loughton | 2016 |
| Artillery Mansions Estate Management Company Limited | London | 1998 |
| Artillery Meadow (Kelsale) Limited | Norwich | 2021 |