| Aquadynamic Holdings Limited | Manchester | 2026 |
| Aquae Sulis Dental Limited | Bath | 2018 |
| Aquaflo Solutions Ltd | London | 2026 |
| Aquamarine Properties Company Limited | London | 2019 |
| Aquarius (Southbourne) Management Company Ltd | Bournemouth | 2020 |
| Aquarius (ST Michaels Road) RTM Company Limited | London | 2015 |
| Aquarius (Witney) Management Company Limited | New Milton | 2005 |
| Aquarius Close (Crondall) Residents Management Company Limited | Farnham | 2005 |
| Aquarius Facilities Management Limited | Birmingham | 2020 |
| Aquarius House Limited | London | 2010 |
| Aquarius Plumbing (Melton Mowbray) Limited | Melton Mowbray | 2010 |
| Aquarius PM Limited | London | 2024 |
| Aquarius Property Services Ltd | Uxbridge | 2025 |
| Aquarius Riverside Limited | Hampton | 1975 |
| Aquatec Servicing and Maintenance Limited | Bristol | 2011 |
| Aquatherm Solutions NW Ltd | Widnes | 2026 |
| Aquatrend Limited | London | 2000 |
| Aquatude Management Company Limited | New Milton | 2007 |
| Aquavista RTM Company Ltd | Weymouth | 2017 |
| Aquila Freehold Limited | Bournemouth | 2021 |
| Aquila Grove Management Limited | St. Albans | 2020 |
| Aquila Homes Property Ltd | Croydon | 2026 |
| Aquilla Court Limited | Cardiff | 1976 |
| Aquinna Mews (Addlestone) Management Company Limited | Farnham | 2013 |
| Aquitaine House (Management) Company Limited | Salisbury | 1982 |
| AR Freehold Ltd | Hove | 2025 |
| AR Group Estates Ltd | Blackburn | 2023 |
| AR Holmes Ltd | London | 2025 |
| AR Houchell Holdings Ltd | Hornchurch | 2022 |
| AR Living Spaces Ltd | Birmingham | 2026 |
| AR Property Services Surrey Limited | London | 2024 |
| AR Proptech Ltd | Weston-Super-Mare | 2024 |
| Ar-Razaq Management Services Ltd | Slough | 2019 |
| AR1 Properties Ltd | Glasgow | 2024 |
| AR80 Property Ltd | Cardiff | 2022 |
| ARA & ORA Home Limited | London | 2020 |
| ARA London Limited | Chalgrove | 2024 |
| Arabella Park (Kimblewick) Management Company Limited | Lichfield | 2024 |
| Arabia Court Management (Hythe) Limited | Poole | 1998 |
| Arabian Drive (M.C.) Limited | Reading | 2022 |
| Arabian Lodge Management Company Limited | East Cowes | 1998 |
| Araby Court Management Limited | Southampton | 1993 |
| Araford Limited | Cardiff | 1972 |
| Aragon Court (Ampthill) Management Company Limited | Houghton Regis | 1988 |
| Aragon Court (Beckenham) RTM Company Limited | London | 2007 |
| Aragon Court Limited | Marlow | 2005 |
| Aragon Court Management Company Limited | Wokingham | 1986 |
| Aragon House Property Management Company Limited | Camberley | 2004 |
| Aragon Management Company (Sutton) Limited | Sutton | 1987 |
| Aragon Place (Brookwood) Management Company Limited | Woking | 2004 |
| Aragon Place Management Company Limited | Camberley | 1994 |
| Aragon Tower RTM Company Limited | Maidstone | 2021 |
| Aragorn Place Residents Company Limited | Dorking | 2003 |
| Aralia Court Management Co. Limited | Ramsgate | 1981 |
| Aralia House Management Limited | Surrey | 1989 |
| Aralia Limited | London | 2022 |
| Aran Drive Management Limited | Barnet | 1970 |
| Aranmore Management Limited | Didsbury | 2004 |
| Aras Property Investments Limited | Salford | 2021 |
| ARB Drive Limited | Sutton Coldfield | 2022 |
| Arbor Close (Highcliffe) Management Limited | Christchurch | 2020 |
| Arbor Close Management Company Limited | Cambridge | 2020 |
| Arbor Court (Freehold) Limited | London | 2001 |
| Arbor Court Residents Association Limited | Birmingham | 1993 |
| Arbor Heights (Management) Limited | Farnham | 2004 |
| Arbor House RTM Company Limited | Harrow | 2020 |
| Arbor Lane Winnersh Berkshire Limited | Hemel Hempstead | 2015 |
| Arbor Walk (Cuckfield) Management Company Ltd | Farnborough | 2015 |
| Arboretum Court Management Company Limited | Malvern | 2009 |
| Arborfield Close Residents (Sixteen) Limited | Farnham | 1976 |
| Arborfield Close Residents (Thirty SIX) Limited | Windsor | 1976 |
| Arborfield Court Management Company Limited | Reading | 1996 |
| Arborfield Drive Management Ltd | Newmarket | 2012 |
| Arborfield East Residents Company Limited | Peterborough | 2011 |
| Arborfield Mews Residents Company Limited | Peterborough | 2000 |
| Arborfield Residents (Plots 60 - 70) Management Company Limited | Reading | 2020 |
| Arbormead House (Residents) Limited | Leighton Buzzard | 1976 |
| Arbormead House Freehold Ltd | Leighton Buzzard | 2011 |
| Arbour (Helsby) Management Limited | Shrewsbury | 2007 |
| Arbour (Priorsfield) Management Company Limited | Godalming | 2000 |
| Arbour Close Freehold Limited | Rugby | 2011 |
| Arbour Investments Limited | Banbridge | 2018 |
| Arbour Management (Orford Road) Limited | London | 2022 |
| Arbourvale (Area B) Management Company Limited | Hastings | 2005 |
| Arbrook Hall Management Company Limited | Chessington | 2001 |
| Arbury House Management Company Limited | Northampton | 2012 |
| Arbuthnot Road Limited | London | 2014 |
| ARC - N11 Management Company Limited | Cardiff | 2006 |
| ARC and SMC Holdings Limited | Preston | 2023 |
| ARC Building RTM Company Ltd | London | 2025 |
| ARC Harbourside Management Ltd | Bristol | 2021 |
| ARC Home Freeholds Ltd | Hereford | 2024 |
| ARC House (Wembley) Management Limited | Pinner | 2025 |
| ARC House Management Company Limited | Fraserburgh | 2016 |
| Arcade Property Ltd | London | 2021 |
| Arcadia (Bolton) Management Company Limited | Manchester | 2007 |
| Arcadia Court 2 RTM Company Limited | Cambridge | 2016 |
| Arcadia Court Residents Association Limited | Richmond | 2000 |
| Arcadia Court RTM Company Limited | Cambridge | 2011 |
| Arcadia House Management Company Limited | Tenby | 2004 |