| Admiralty Way Owners Company Limited | Kingston Upon Thames | 2017 |
| ADN Equity Holdings Limited | Glasgow | 2025 |
| Adre Properties Limited | Newport | 2014 |
| Adrian Court Management Company (North) Limited | Lowestoft | 1992 |
| Adrian Court Management Company (South) Limited | Lowestoft | 1991 |
| Adrian House (Freehold) Ltd | Abbots Langley | 2005 |
| Adrian House Management Co Ltd | Leeds | 2025 |
| Adrian House Residents Association Limited | Sudbury | 1982 |
| Adrian Square Limited | Birchington | 2016 |
| Adrian's Court Limited | Southend On Sea | 1969 |
| Adrians Walk Management (Number 2) Company Ltd | Slough | 2004 |
| Adrians Walk Management (Number 3) Company Ltd | Bourne End | 2009 |
| Adrians Walk Management Company Limited | Bourne End | 2001 |
| ADS Property Management Ltd | London | 2014 |
| Adsj Developments Ltd | Birmingham | 2023 |
| Adtl Limited | Bishop'S Stortford | 2018 |
| ADU Homes Ltd | Rainham | 2021 |
| Adur Lofts (Worthing) Limited | Brighton | 2018 |
| Adur Valley Court Lessees Limited | Steyning | 2001 |
| Adurleys Management Company Limited | Hove | 2004 |
| Advance House Limited | London | 1995 |
| Advance Property Developers Ltd | Chigwell | 2023 |
| Advanceblock Property Management Limited | | 1987 |
| Advanceconcept Residents Management Limited | Cheltenham | 1987 |
| Advanced Building Services (Northern) Ltd | Wallasey | 2025 |
| Advanced Electrical & Charging Ltd | Rotherham | 2022 |
| Advanced Logistics Recruitment Limited | Selby | 2014 |
| Advancefirst Property Management Limited | Dover | 1992 |
| Advanceplace Property Management Limited | Newcastle Upon Tyne | 1992 |
| Advanceregion Property Management Limited | Cambridge | 1992 |
| Advancestake Property Management Limited | Haverhill | 1987 |
| Advancestart Property Management Limited | Surrey | 1992 |
| Advent 1 Management Company Limited | Manchester | 2009 |
| Advent 2 & 3 Management Company Limited | Manchester | 2009 |
| Adventis Properties Ltd | Reading | 2024 |
| Adventurers Quay Management Company Limited | Cardiff | 1997 |
| Advera OS Ltd | Manchester | 2025 |
| Adversus Ventum Properties Ltd | London | 2025 |
| Advisemethod Limited | Wallingford | 1991 |
| ADW Certifications Ltd | Benfleet | 2021 |
| Adwell Limited | Cambridge | 1997 |
| Adwood Court (Thatcham) Management Company Limited | Thatcham | 1991 |
| ADX Properties Ltd | London | 2018 |
| Adyar House (Freehold) Limited | Winchester | 2016 |
| Adys Lawn Tenants Association Limited | London | 2017 |
| Adzepa Limited | Northampton | 2024 |
| AE Residence Limited | Birmingham | 2024 |
| AE Sheppard Ltd | Bristol | 2018 |
| Aearis Property Ltd | Newtownards | 2025 |
| Aeccc Limited | London | 2024 |
| AED Holdings Ltd | Grantham | 2025 |
| AEG Garden Maintenance Ltd | Chorley | 2019 |
| Aegean Investments Limited | Uckfield | 2009 |
| Ael-Y-Don and Gwen-Y-Don (Aberystwyth) Management Limited | Aberystwyth | 1987 |
| Aelfrith Court Management Company Limited | Kington | 2021 |
| Aelm Management Limited | London | 2024 |
| AEM Property Maintenance Limited | Nottingham | 2024 |
| Aeneas Property Limited | Marlow | 2021 |
| Aequitas Crescent Limited | London | 2023 |
| Aequitas PHL - SPV 2 Ltd | London | 2021 |
| Aesculus Property Management Limited | Edinburgh | 2024 |
| Aesop Enterprise Ltd | Buxton | 2020 |
| Aesrem Limited | Colchester | 2012 |
| Aethelstone Properties Ltd | Brighton | 2025 |
| Aethelwulf Investments Ltd | West Midlands | 2023 |
| AF & JF Properties Ltd | Coventry | 2023 |
| AF Residential Limited | Luton | 2018 |
| AF2KP Ltd | Lymm | 2026 |
| Affinity (EA) Management Company Limited | Norwich | 2006 |
| Affinity Investment Holdings Ltd | Wilmslow | 2021 |
| Affinity Properties Ltd | Sidcup | 2023 |
| Affluence Properties Ltd | Egham | 2021 |
| Affordable Homes for Life Ltd | London | 2025 |
| Affordable Housing Communities Limited | Bournemouth | 2015 |
| Affordable Property Management Limited | London | 2007 |
| Affordable Property Repairs Limited | London | 2016 |
| AFG Property Limited | Leicester | 2023 |
| Afhn Management Ltd | Royston | 2026 |
| Afmn Management Company Limited | London | 2022 |
| Afms Property Management Ltd | London | 2022 |
| Afon Building and Consultancy Services Limited | Milton Keynes | 2013 |
| African Cinema Ltd | London | 2019 |
| African Conservation Finance Limited | Windsor | 2022 |
| African Fabrics Limited | Croydon | 2013 |
| Afroagora Holdings (UK) Limited | Kington | 2022 |
| Afrobizcym Ltd | Cardiff | 2025 |
| AFT 2015 Ltd | London | 2016 |
| After Sales Team Ltd | Ringwood | 2019 |
| Afterbridge Limited | Stanmore | 1989 |
| Afterpark Limited | Altrincham | 1989 |
| Afton House Roundhay Limited | Grange-Over-Sands | 2019 |
| AG Estates (Edgbaston) Limited | Birmingham | 1982 |
| AG Flitwick Management Limited | Nazeing | 2012 |
| AG Grands Property Investments Limited | Manchester | 2022 |
| AG Home and Property Limited | Worksop | 2025 |
| AG Propertiesni Limited | Belfast | 2023 |
| AG Property Co. Limited | St Asaph | 2014 |
| AG Property Management Limited | London | 2025 |
| AG1 Homes Management Company Limited | New Milton | 2005 |
| Agape Family Holdings Ltd | Castleford | 2020 |