| Agar Flat Owners Association Limited | Truro | 1985 |
| Agar House Administration Limited | Hailsham | 1999 |
| Agarwal Properties 09 Limited | Grays | 2024 |
| Agate House RTM Company Ltd | London | 2024 |
| Agavil Investments Limited | Hereford | 1957 |
| AGB Property Solutions Ltd | Aberdeen | 2024 |
| AGC Property Group Ltd | Liverpool | 2025 |
| Agden Hall Farm Management Company Limited | Croydon | 2004 |
| AGE4146 Ltd | Andover | 2022 |
| Agecroft Apartments Management Company Ltd | Poole | 2015 |
| Agecroft Court Management Company Limited | Stockport | 2015 |
| Agecroft Estates Management Company Limited | Hoddesdon | 2003 |
| Agentfield Limited | London | 1981 |
| Agentgold Limited | Barnsley | 1987 |
| Agentsurvey Limited | Aberystwyth,Ceredigion | 1993 |
| Agig Investments Limited | Cardiff | 2025 |
| Agile Lets Ltd | Cardiff | 2018 |
| Agin Court RTM Company Limited | London | 2013 |
| Agincourt Residents (Ascot) Limited | Ascot | 1994 |
| Agincourt Residents Society Limited | Harrow | 1982 |
| Agivey Court Management Services Limited | Limavady | 2006 |
| AGL Realty Limited | Lichfield | 2025 |
| Aglaia Road Limited | Hove | 2005 |
| Aglar Limited | Chiswick | 2021 |
| AGM Living Ltd | Peterborough | 2025 |
| AGM Property Management Ltd | Bishopton | 2023 |
| Agnes Grey House Limited | Scarborough | 2004 |
| Agnew Court (Lytham ST Annes) Limited | London | 1992 |
| AGO Asset Management Limited | Darlington | 2023 |
| Agora Gardens Road Management Company Limited | Stoke-On-Trent | 2014 |
| AGR Properties Scotland Ltd | Dundee | 2023 |
| AGR RTM Company Limited | Preston | 2021 |
| Agricola Court Management Company Limited | Southampton | 1977 |
| AGS Management Limited | London | 2000 |
| AGS Management Services Ltd | London | 2008 |
| AGS Property Services Limited | London | 2022 |
| AGT Homes Ltd | Derby | 2025 |
| Aguamarina Private Ltd | London | 2023 |
| Agusta Park Flats Yeovil Management Company Limited | New Milton | 2017 |
| Agusta Park Yeovil Management Company Limited | York | 2015 |
| Agvp Limited | Barry | 2025 |
| AGW Property Management Ltd | Belfast | 2022 |
| AH Invest Ltd | Coatbridge | 2024 |
| AH Lettings Ltd | Hemel Hempstead | 2016 |
| AH Residential Property Company Ltd | Exeter | 2025 |
| AH Star Management Ltd | Manchester | 2025 |
| AH West Property Ltd | Uxbridge | 2022 |
| Ahason’S UK Limited | Manchester | 2024 |
| AHB Properties Ltd | Sheffield | 2018 |
| Ahdmt Ltd | London | 2025 |
| Ahedi Construction Hampshire Ltd | Southampton | 2025 |
| Ahhm Management Services RTM Company Limited | Wickford | 2023 |
| AHI Home Ltd | Oldbury | 2025 |
| Ahlux Court 1-8 RTM Company Limited | Sale | 2024 |
| Ahlux Court 9-39 RTM Company Limited | Sale | 2024 |
| AHM Ambassador Limited | Milton Keynes | 2011 |
| AHM Block 5 RTM Company Limited | London | 2009 |
| Ahmad Property Ltd | Fareham | 2025 |
| Ahmed & Ahmed Group Ltd | London | 2021 |
| Ahmed Innovations Ltd | Manchester | 2025 |
| Ahmed Properties Trade Ltd | Dagenham | 2022 |
| Ahmed Property 24 Limited | Stockport | 2024 |
| Ahoestates Limited | Bristol | 2023 |
| Ahpf Ltd | London | 2023 |
| Ahsummit Ltd | Preston | 2026 |
| AHU Properties Ltd | Derby | 2025 |
| Ahvel Ltd | London | 2019 |
| AHW Management Limited | Wrexham | 2004 |
| AHX Limited | Brighouse | 2005 |
| Ai&Zi Property Ltd | Bradford | 2025 |
| Aidan Property Company Ltd | Elstree | 2019 |
| Aidcal Ltd | Manchester | 2025 |
| Aigburth Grange Management Company Limited | Croydon | 2016 |
| Aigburth House Limited | Shrewsbury | 1999 |
| Aigburth Mansions (Freehold) Limited | London | 2004 |
| Aigburth Methodist Management Ltd | Liverpool | 2015 |
| Aigburth Road Flats Management Company Limited | Liverpool | 1996 |
| Aigburth Road Property Management Company Limited | Liverpool | 2014 |
| AIK Solutions Ltd | Ashton-Under-Lyne | 2025 |
| Aika Elite Estates Ltd | London | 2026 |
| Aiken Meadow Management Company Limited | Lancaster | 2019 |
| Aikin Square Management Ltd | Ballyclare | 2021 |
| Aileach View 5 Properties Ltd | Londonderry | 2017 |
| Ailleachd Dhorcha Ltd | Glasgow | 2025 |
| Ailsa House (Leeds) Management Company Limited | Stockport | 2025 |
| Ailsa House Management Company Limited | Croydon | 2005 |
| Ailsa ROW Management Company Ltd | Harpenden | 2024 |
| Ailsa View Management Company Limited | Larne | 2016 |
| AIM Lettings Ltd | Leigh-On-Sea | 2022 |
| Aimco Property Management Limited | London | 2019 |
| Aimcover Limited | Bristol | 1986 |
| Aimlord Properties Limited | Poole | 1989 |
| Aimsbury Court 1-6 RTM Company Limited | Birmingham | 2011 |
| Aimsbury Court 10-15 RTM Company Limited | Birmingham | 2011 |
| Aimsbury Court 7-9 RTM Company Limited | Birmingham | 2011 |
| Ainscows Meadow Management Company Limited | Aspull | 2021 |
| Ainsdale Management Company Southport Limited | Southport | 2001 |
| Ainsland Court Management Limited | Croydon | 1993 |
| Ainsley Court Management Company Limited | Hemel Hempstead | 1995 |
| Ainslie Mews Management Company Limited | Grimsby | 1989 |