| Aston House (Totland) Management Co. Limited | Totland Bay | 1998 |
| Aston House Raynes Park Limited | Dorchester | 2011 |
| Aston House Way Management Company Limited | Whitchurch | 2023 |
| Aston Lettings Limited | Ilford | 2013 |
| Aston Meadows (Management Company) Limited | Sheffield | 2025 |
| Aston Park Grange Management Company Limited | Sutton Coldfield | 2006 |
| Aston Park Residents' Association Limited | Watlington | 2015 |
| Aston Place Freeholders Ltd | London | 2025 |
| Aston Place Management Company Limited | London | 2006 |
| Aston Road Management Company Limited(The) | London | 1986 |
| Aston Square (Oldbury) Management Company Limited | New Milton | 2007 |
| Aston Square Block Management Ltd | London | 2021 |
| Aston Vale Estate Management Company Limited | Harlow | 2013 |
| Aston Vale Management Company Limited | Stevenage | 2013 |
| Aston View and Elstree Road Flat Management Company Limited | Hemel Hempstead | 2009 |
| Aston View Management Company Ltd | Sevenoaks | 2022 |
| Aston Webb House Freehold Limited | London | 2018 |
| Astonbury Manor (NO.1) Limited | Hertford | 1992 |
| Astonbury Manor (NO.2) Limited | Hoddesdon | 1992 |
| Astons Residential Management Ltd | Hertford | 2010 |
| Astor Close Management Limited | Kingston Upon Thames | 1966 |
| Astor Court (Plymouth) RTM Company Limited | Plymouth | 2015 |
| Astor Gardens Management Company Limited | Dorking | 2020 |
| Astor Grange Management Company Ltd | Croydon | 2021 |
| Astor House Limited | Harlow | 1998 |
| Astor House Management Company Ltd | Bourne End | 2015 |
| Astor Management Limited | London. | 1986 |
| Astor Place Management Company Limited | Hoddesdon | 2006 |
| ASTOR21 Ltd | Drybrook | 2024 |
| Astoria Court Limited | Scarborough | 1973 |
| Astoria Court Property Management Ltd | Paignton | 2026 |
| Astoria Heights Residents Management Company Limited | Slough | 2015 |
| Astoria Park Residents Management Company Limited | Tarporley | 2026 |
| Astorpeak Properties Limited | London | 1988 |
| Astpark Limited | London | 1995 |
| Astra Court (Maintenance) Limited | Rochford | 1977 |
| Astra House Brighton Limited | Shoreham-By-Sea | 2004 |
| Astra House Freehold Limited | London | 2016 |
| Astracastle Limited | London | 1995 |
| Astracourt Management Company Limited | Cardiff | 1992 |
| Astrada Property Management Ltd | Chesterfield | 2008 |
| Astral Apartments Limited | Southend-On-Sea | 2010 |
| Astral Freehold Ltd | Ruislip | 2026 |
| Astral House Management Co Limited | London | 1998 |
| Astral Park Management Company Limited | Darlington | 2019 |
| Astralrule Property Management Limited | Leicestershire | 1989 |
| Astrazone Property Management Limited | Princes Risborough | 2003 |
| Astridge Park Management Company Limited | Near Bangor On Dee | 1990 |
| Astro Property Management Limited | Bury St. Edmunds | 2013 |
| Astro Residential Ltd | Bury St. Edmunds | 2015 |
| Astrocrest Limited | London | 1983 |
| Astron Properties Limited | Winchester | 1985 |
| Asturian Gate Management Company Limited | Preston | 2003 |
| Astute Property and Asset Management Limited | Blackburn | 2021 |
| Astute Property Management Limited | Blackburn | 2012 |
| Astwick Manor Management Company Limited | Hemel Hempstead | 2004 |
| Astwood (White Lion) Management Limited | Redditch | 2016 |
| Astwood Farm Barns Limited | Bromsgrove | 1994 |
| Astwood Grange Residents' Association Limited | Redditch | 2005 |
| Astwood Road Management Company Limited | Worcester | 2023 |
| Asuka (Europe) Ltd | Ilford | 2022 |
| ASW Freeholders Ltd | London | 2018 |
| Aszouj Limited | Mildenhall | 2025 |
| AT Empire Ltd | Leicester | 2025 |
| AT Five Plus SIX RTM Company Ltd | Scarborough | 2021 |
| AT Four Plus Seven RTM Company Ltd | Scarborough | 2021 |
| AT Home 365 Limited | London | 2012 |
| AT Home Cleaning Ltd | Hull | 2013 |
| AT Home Help Limited | Leicester | 2019 |
| AT Home Property Limited | Plymouth | 2015 |
| AT the Beach Management Company Limited | Plymouth | 2008 |
| At&Al Properties Limited | Caergwle | 2024 |
| Atano Properties Limited | London | 2026 |
| Atari Homes Limited | Normanton | 2024 |
| Ataur Maintenance Ltd | London | 2021 |
| ATC Property Partnership Ltd | Coventry | 2022 |
| ATE Rentals Ltd | London | 2021 |
| Ateee Ltd | Kingswinford | 2025 |
| Atelier F B Limited | Mildenhall | 2024 |
| Atelier Property Group Limited | London | 2025 |
| Aterford Property Management Limited | Weston-Super-Mare | 1986 |
| Atfr Ltd | Peterhead | 2022 |
| ATG Homes Ltd | London | 2022 |
| Athea Property Investment Ltd | Richmond | 2019 |
| Athelai Edge (Down Hatherley) Management Company Limited | Bristol | 2023 |
| Atheldene Co-Owners Limited | London | 2020 |
| Athelney Court Freehold Limited | Bournemouth | 2003 |
| Athelney Management Torquay Limited | Torquay | 2009 |
| Athelstan Court (Management) Limited | 328A Wimbourne Road, Winton | 1982 |
| Athelstan House Management Limited | Harlow | 1985 |
| Athelstan House Worcester Limited | Malvern | 1989 |
| Athelstan Park Owners Management Company Limited | Caldicot | 2017 |
| Athelstan Property Services Limited | Bishop Auckland | 2015 |
| Athelstane Crescent Management Company Limited | Bishop Auckland | 2014 |
| Athelstane Terrace Management Limited | Buxton | 1986 |
| Athena Close Block a Freehold Company Limited | Kingston Upon Thames | 2013 |
| Athena Court Limited | Croydon | 1988 |
| Athena Court Management Company Limited | Warwick | 2007 |
| Athena House (Croydon) Management Company Ltd | Victoria | 2020 |
| Athena House Management Company Limited | Warwick | 2007 |