| Ainstey Drive (Sparkford) Management Company Limited | Yeovil | 2005 |
| Ainsworth Place Ltd | Cambridge | 2018 |
| Ainsworth Rise Management Company Limited | Stockport | 2007 |
| Aintree Park Management Company Limited | Blackburn | 2021 |
| Aintrees House Management Limited | Menston | 1996 |
| AIP Advisors Ltd | Rayleigh | 2026 |
| Air Holdings Ltd | London | 2025 |
| Air Peace of Mind Ltd | London | 2016 |
| Air Property Management Ltd | Billericay | 2023 |
| Air Sea House Company Limited | London | 2010 |
| Airah Properties Limited | Bedworth | 2023 |
| Airbear Properties Limited | Waterlooville | 2019 |
| Airborne House Management Limited | London | 1997 |
| Aircycle Ltd | Essex | 2025 |
| Aird House Ltd | Chertsey | 2016 |
| Aird Services Limited | Coleraine | 2000 |
| Airdreamer Limited | Edinburgh | 2025 |
| Aire & Sheaf Holdings Ltd | Sheffield | 2024 |
| Aire Shannon Limited | Elland | 1979 |
| Aire Valley House Residents Management Company Limited | Pudsey | 2024 |
| Aire Valley Management Company Limited | Bingley | 2006 |
| Aire View Gardens Management Company Limited | York | 1997 |
| Airedale LEA (Eastburn) Management Company Limited | Derby | 2016 |
| Airedale Mills Management Company Limited | Settle | 2007 |
| Airedale View (Leeds) Management Company Limited | Leeds | 2006 |
| Aireville Rise (Frizinghall) Management Limited | Bradford | 1987 |
| Airfine Residents Association Limited | Brixham | 1984 |
| Airfinity Luxe Ltd | Romford | 2025 |
| AIRHOSTS4U Ltd | Hollinwood | 2018 |
| Airie Management Company Limited | Manchester | 2021 |
| Airkey Limited | London | 2017 |
| Airlet Limited | London | 2021 |
| Airlie House (Freehold) Limited | Putney | 2004 |
| Airlie Road (Residents) Management Company Limited | Winchester | 1994 |
| Airnsland Residents Association Limited | Bromley | 1981 |
| Airpoint RTM Company Limited | Cambridge | 2011 |
| Airstay Properties Ltd | London | 2023 |
| Airthrey Court Limited | Bournemouth | 1980 |
| Airworks Management Company Limited | London | 2023 |
| Airzair Limited | London | 2019 |
| Aisha Property Limited | High Wycombe | 2013 |
| Aishnika Group Limited | Leicester | 2015 |
| Aisling Court Management Company Limited | Eastleigh | 2018 |
| Aisling Investments Limited | Manchester | 2024 |
| Aissele Place Management Company Limited | Esher | 2017 |
| AIT Mitra Properties Limited | Billingham | 2025 |
| Aitmaad Residencia (Private) Limited | Oldham, United Kingdom | 2026 |
| AIX Properties Ltd | London | 2021 |
| Aizle Property Limited | Glasgow | 2021 |
| AJ & AG Holdings Ltd | Bakewell | 2025 |
| AJ & M Properties Ltd | Wembley | 2026 |
| AJ Apartment Management Ltd | London | 2022 |
| AJ Bespoke Lettings Ltd | Warrington | 2025 |
| AJ Estate Group Ltd | London | 2024 |
| AJ Living Ltd | Ashby-De-La-Zouch | 2025 |
| AJ National Property Ltd | Leicester | 2025 |
| AJ Premier Property Ltd | London | 2026 |
| AJ Scott Properties Ltd | Oldham | 2025 |
| AJ Staffing Solutions Ltd | Epsom | 2019 |
| AJ Wades Real Estate Ltd | Rotherham | 2025 |
| AJ110 Limited | Glasgow | 2025 |
| AJB Stays Limited | Sudbury | 2024 |
| AJD Properties and Developments Ltd | Newport | 2023 |
| Ajda Property Management Company Limited | London | 2026 |
| AJE Homes Ltd | Warrington | 2022 |
| Ajit & DEN Limited | Croydon | 2018 |
| Ajit Homes Limited | Gravesend | 2025 |
| AJK Properties Hull Ltd | Hessle | 2025 |
| AJK Property Rentals Limited | Bolton | 2026 |
| AJL Frame Ltd | Hamilton | 2022 |
| AJL Real Estate Rentals Ltd | Camberley | 2019 |
| AJM Services (UK) Limited | Barnsley | 2014 |
| Ajmal Estates Limited | York | 2025 |
| AJN Apartments Limited | London | 2018 |
| AJN Property Management Ltd | Streatham | 2021 |
| Ajon Cambridge Ltd | Gravesend | 2023 |
| AJQ Improvements Ltd | Leicester | 2023 |
| AJR Property Centre Ltd | Wirral | 2025 |
| AJR Property Management Limited | Holme | 2018 |
| AJS Diamond Invest Ltd | London | 2022 |
| AJS Prop Management Ltd | London | 2025 |
| Ajuda Property Management Ltd | Cardiff | 2019 |
| AJW Facilities Limited | Camberley | 2014 |
| AJW Property Management and Maintenance Ltd | Brighton | 2019 |
| AK & N Properties Ltd | London | 2025 |
| AK Blinds Limited | Leighton Buzzard | 2020 |
| AK Facilities Management Ltd | London | 2021 |
| AK Group Ltd | Nelson | 2021 |
| AK Properties Solutions Limited | Bracknell | 2026 |
| AKA Pure Limited | Dorset | 2020 |
| Akai Management Ltd | Leicester | 2025 |
| Akbar Consulting Ltd | London | 2026 |
| Akcaba Limited | London | 2018 |
| Akeman Mews Management Company Limited | Beaconsfield | 2016 |
| Akenside Terrace Management Limited | Whitley Bay | 2004 |
| Akenside Terrace Residents Association Limited | Newcastle-Upon-Tyne | 1985 |
| Akers Court (Waltham Cross) Management Company Limited | London Colney | 2006 |
| Akersloot Court Management Limited | Colchester | 2000 |
| AKH Housing Limited | Birmingham | 2025 |
| AKH Property Holdings Ltd | Welshpool | 2019 |