| Athena North Walls Limited | Winchester | 2019 |
| Athena Prop Co Limited | Swansea | 2026 |
| Athena's Daughters Limited | Reading | 2010 |
| Athenaestatesmanagement Limited | Kington | 2024 |
| Athenia Close Management Limited | Hoddesdon | 2001 |
| Athenian Properties Limited | Ramsgate | 1992 |
| Atherfield Park View Road Management Co Ltd | Reigate | 2024 |
| Atherley Court Residents Company Limited | Newport | 2001 |
| Atherley Fields (Southampton) Management Limited | Hoddesdon | 1998 |
| Atherley Road Residents Company Limited | Hayling Island | 1998 |
| Atherstone Place Phase 2 Residents Management Company Limited | Hemel Hempstead | 2025 |
| Atherstone Place Residents Management Company Limited | Swadlincote | 2025 |
| Atherton Close Residents Limited | | 2001 |
| Atherton Court Management Limited | London | 1982 |
| Atherton Court Residents Association Limited | Sudbury | 2021 |
| Atherton Hill (Farnham) Management Company Limited | Bourne End | 2018 |
| Atherton House Management Company Limited | Wallasey | 2008 |
| Atherton Place Management Company Limited | Camberley | 2022 |
| Atherville Management Company Limited | High Wycombe | 1964 |
| Athill Court Freeholders Limited | Luton | 2000 |
| Athol House Freehold Limited | London | 2020 |
| Athol Lodge Management Company Limited | Margate | 2009 |
| Athol Square Management Company Limited | Whyteleafe | 1990 |
| Athrington Court Residents Association Limited | Bognor Regis | 1984 |
| Atkins Homes Ltd | Romford | 2024 |
| Atkinson House Maintenance Limited | Sale | 1970 |
| Atkinson Property Holdings Limited | Harlow | 2022 |
| Atkinson Property Services Ltd | Lutterworth | 2025 |
| Atkinsons Accommodation Limited | Castleford | 2025 |
| ATL Estates Ltd | Tredegar | 2025 |
| ATL Management Limited | Coleraine | 2020 |
| Atlanta Building Residents Company Limited | Croydon | 2013 |
| Atlanta Flats Management Company (2009) Limited | Newquay | 2009 |
| Atlantic Bay Flats Freehold Company Limited | Truro | 2013 |
| Atlantic Bay Flats Management Company Limited | Truro | 1987 |
| Atlantic C Properties Limited | Bexleyheath | 2017 |
| Atlantic Court (Ilfracombe) Management Company Ltd | Barnstaple | 2009 |
| Atlantic Court (Woolacombe) Management Company Limited | Rotherham | 1997 |
| Atlantic Court Maintenance Company Limited | Weston-Super-Mare | 1974 |
| Atlantic Cove Portstewart Management (NO.2) Limited | Portstewart | 2002 |
| Atlantic Developments N.W Ltd | Liverpool | 2019 |
| Atlantic Homes Management Ltd | London | 2025 |
| Atlantic House (Billingshurst) Management Co Ltd | Horsham | 2019 |
| Atlantic House (Flats) Limited | Shoreham-By-Sea | 1973 |
| Atlantic House (Polzeath) Management Limited | Bodmin | 2018 |
| Atlantic House (Weston-Super-Mare) Limited | Weston-Super-Mare | 1989 |
| Atlantic House London Limited | Henley-On-Thames | 2002 |
| Atlantic House Residents' Association (Morecambe) Limited | Morecambe | 1974 |
| Atlantic Mews (Management) Limited | Stanmore | 2001 |
| Atlantic Mews (ST Agnes) Management Limited | St. Agnes | 2004 |
| Atlantic Point Management Company Limited | Portstewart | 2017 |
| Atlantic Road Management Company (NO 2) Limited | Limavady | 2013 |
| Atlantic Sands (Castlerock) Management Company Ltd | Coleraine | 2019 |
| Atlantic Shelf 46 Limited | London | 1993 |
| Atlantic Square Management Limited | Maldon | 2004 |
| Atlantic Wharf (Wapping) Freehold Limited | Stevenage | 2015 |
| Atlantic Wharf Property Management Company Limited | Stevenage | 1995 |
| Atlantica Residents Limited | Norwich | 1982 |
| Atlantis NW8 Limited | London | 2013 |
| Atlantis Services (Portrush) Ltd | Portrush | 2006 |
| Atlas (Ipswich) Management Company Limited | Ipswich | 1984 |
| Atlas 375 Limited | London | 2010 |
| Atlas Building (Barwell) Limited | Northampton | 2005 |
| Atlas Grove Enterprises Ltd | Cardiff | 2026 |
| Atlas Mill RTM Company Ltd | Birmingham | 2025 |
| Atlas MRC Ltd | Birmingham | 2025 |
| Atlas Place Management Limited | | 2003 |
| Atlas Property Maintenance Ltd | Enfield | 2024 |
| Atlas Property Management Ltd | Northampton | 2019 |
| Atlas Property Management Services Ltd | London | 2022 |
| Atlas Property Ventures Limited | Cardiff | 2024 |
| Atlas Works Management Company Limited | London | 2004 |
| Atlingcourt Properties Limited | Hove | 1994 |
| Atlingworth Mansions Limited | Hove | 1996 |
| ATM Property Management Ltd | New Malden | 2016 |
| Atma Assets Ltd | Buckingham | 2023 |
| Atmos Space Ltd | London | 2025 |
| Atnm Realty Limited | Grays | 2023 |
| Atom Property Scot Ltd | Glasgow | 2026 |
| Atomd'Or Ltd | Forest Row | 2021 |
| Atpbuildingsproperty Ltd | Stoke-On-Trent | 2025 |
| Atrium Flat Management Company Limited | Liverpool | 2006 |
| ATT Property Services Ltd | Bedgebury | 2019 |
| Attachvale Limited | London | 1982 |
| Attawa Properties Ltd | Billericay | 2024 |
| Attenborrow Court Property Management Limited | Newquay | 2000 |
| Atterbury Limited | Bromley | 2000 |
| Attewater House Management Limited | Cambridge | 2020 |
| Attewell Court Limited | Bath | 1980 |
| Attingham Drive 20-30 RTM Company Limited | Birmingham | 2024 |
| Attingham Drive Management Company Limited | Birmingham | 2013 |
| Attlee Way (Sittingbourne) Residents Management Company Limited | Sittingbourne | 2015 |
| Attwood Mews Management Company Limited | Plymouth | 2006 |
| Atwell Martin Block Management Ltd | Plymouth | 2025 |
| Atwood Management Ltd | London | 2022 |
| Atwood Property Management Limited | Manchester | 2013 |
| Atwood Residents' Association Limited | Leatherhead | 2021 |
| Auber's Ridge Management Company Limited | Lincoln | 2019 |
| Aubretia View Management Company Limited | Elland | 2019 |
| Aubrey Gardens Luton Limited | Luton | 2011 |