| Asprey Park RTM Company Limited | London | 2026 |
| Asquith House Edgbaston Management Company Limited | Henley-In-Arden | 2014 |
| Asquith House RTM Company Limited | Hoddesdon | 2024 |
| Asquith Mews Ltd | Southwell | 2012 |
| Asquith Park Management Company Limited | Leeds | 2015 |
| ASR Practice Properties Limited | Selby | 2021 |
| ASR Warwick Ltd | Alcester | 2017 |
| Asro Partnership Limited | Dyfed | 2017 |
| Assay House Apartments (Truro) Limited | Newquay | 2026 |
| Assay House Management Company Ltd | Truro | 2026 |
| Assay House Service Company Limited | Newquay | 2020 |
| Assembly Apartments (Caretakers Lodge) RTM Company Limited | Hainault | 2017 |
| Assembly Passage RTM Company Limited | London | 2026 |
| Asset Capital 44 Opco Limited | Wetherby | 2025 |
| Asset Care Experts Ltd | London | 2025 |
| Asset Inventory Ltd | London | 2018 |
| Asset Management & Solutions Ltd | Wigan | 2024 |
| Asset Properties 2010 Ltd | Derby | 2025 |
| Asset Rock Property Concierge Limited | London | 2026 |
| Asset Solutions & Investment Ltd | Derby | 2026 |
| Assetblock Property Management Limited | Sandbach | 1986 |
| Assetchain Property Management Limited | London | 1986 |
| Assetform Property Management Limited | London | 1986 |
| Assetlease Limited | Manchester | 1994 |
| Assetplace Property Management Limited | Nuneaton | 1986 |
| Assets Together Management Limited | Herne Bay | 2026 |
| Assetsquare Residents Management Limited | London | 1987 |
| Assetswitch Residents Management Limited | | 1987 |
| Assigndate Property Management Limited | Croydon | 1992 |
| Assignfirst Property Management Limited | | 1992 |
| Assigntake Property Management Limited | Cardiff | 1992 |
| Assigntown Property Management Limited | North Yorkshire | 1993 |
| Assist Rendering Solutions Ltd | West Bromwich | 2024 |
| Assistant Services Ltd | Grantham | 2024 |
| Assistlend Trading Limited | London | 1994 |
| Associated Lettings Limited | Brighton | 2004 |
| Association of Anchorage Residents Company Limited | Burnham On Crouch | 2023 |
| Association of Carmels Trustee Limited | Norwich | 2007 |
| Association of Residents Courtlands Ltd | London | 2026 |
| Assured Housing Ltd | Birmingham | 2007 |
| Assured Property Care Limited | Weybridge | 2025 |
| Assured Property Maintenance and Renovation Limited | Crowborough | 2018 |
| Asta Court Management Limited | Birmingham | 2006 |
| Asta House Freehold Limited | Hastings | 2017 |
| Asta Lettings Limited | London | 2019 |
| Asta Three Ltd | Ilford | 2022 |
| Astaire Court Management Company Limited | Sevenoaks | 2004 |
| Astaway Properties Limited | Derby | 2025 |
| Astbury Developments Ltd | Congleton | 2021 |
| Astbury Gardens (Management Company) Limited | Warrington | 2024 |
| Astbury Place Management Company Limited | Wilmslow | 2014 |
| Astbury Place Management Company NO. 2 Limited | Wilmslow | 2016 |
| Astell Crescent Limited | Frinton-On-Sea | 1987 |
| Astell House Freehold Limited | London | 2008 |
| Astenmoor Limited | | 2002 |
| Aster Court RTM Company Limited | Broadstone | 2017 |
| Astera Mews Management Services Limited | Borehamwood | 2021 |
| Astera Property Management Ltd | London | 2020 |
| Asterfield Residents' Association Ltd | Cheltenham | 1992 |
| Asteria Place (Freehold) Limited | Beaumont | 2022 |
| Asterlodge Properties Limited | | 2004 |
| Astermark Limited | Altrincham | 1998 |
| Astermatch Limited | London | 2001 |
| Astermatt Limited | Cheadle | 1999 |
| Asthill Limited | Southampton | 2007 |
| Astley Brook Management Company Limited | Shrewsbury | 2014 |
| Astley Court Management Limited | Gravesend | 1988 |
| Astley Croft Residents Management Company Limited | Derby | 2025 |
| Astley Fields Management Company Limited | Tamworth, Staffordshire | 2022 |
| Astley Green Management Company Limited | Croydon | 2015 |
| Astley House (Bournemouth) RTM Company Limited | Bournemouth | 2015 |
| Astley House (Mablethorpe) Limited | Horncastle | 2003 |
| Astley Park (NO. 1) Management Company Limited | Sheffield | 2008 |
| Astley Park (NO.2) Management Company Limited | Sheffield | 2008 |
| Astley Place (Seaton Delaval) Management Company Limited | Derby | 2025 |
| Astley Place Residents Management Company Limited | Birmingham | 2025 |
| Aston & Co Inspections Ltd | Wigston | 2026 |
| Aston Apartments Limited | Southsea | 2003 |
| Aston Brook (Aston Clinton) Management Limited | London | 2017 |
| Aston Clinton Road (Aylesbury) Management Company Limited | Birmingham | 2018 |
| Aston Court (Brondesbury) Management Limited | Salisbury | 2013 |
| Aston Court (Earley) Property Management Limited | Reading | 2015 |
| Aston Court (Oldbury) Management Company Limited | Hoddesdon | 2005 |
| Aston Court Estates Limited | Loughton | 1990 |
| Aston Court Freehold Company Ltd | Folkestone | 2022 |
| Aston Court Limited | Sudbury | 2003 |
| Aston Court Management (Edgware) Limited | London | 2013 |
| Aston Court Management Limited | Bognor Regis | 2001 |
| Aston Court Residential Management Company Limited | Tipton | 2021 |
| Aston Court Residents Company Limited | Epsom | 2000 |
| Aston Court RTM Company Limited | Evesham | 2021 |
| Aston Fields Management Company Limited | Aston, Nantwich | 2002 |
| Aston Grange (Newport Pagnell) Management Company Limited | New Milton | 2010 |
| Aston Grange Bengeo Management Limited | Hertfordshire | 2003 |
| Aston Grange Management Company Limited | Brampton | 2007 |
| Aston Green (Management) Limited | Gloucester | 1991 |
| Aston Hall (Derby) Management Company Limited | Derby | 1998 |
| Aston Hall Farm Management Company Limited | Shifnal | 1988 |
| Aston Haven Ltd | Gerrards Cross | 2024 |
| Aston Homes Northampton Ltd | Northampton | 2025 |