| Barwick House Management Company Limited | Yeovil Somerset | 1994 |
| Barwick House Management Company Rushden Ltd | Rushden | 2019 |
| Barwick Road (Management Company) Limited | Bourne End | 2002 |
| Barwood Adderbury Management Company Limited | Salisbury | 2016 |
| Barworth Court Management Company Limited | Whetstone | 1995 |
| Basbow Lane Management Company Limited | Bishop'S Stortford | 2015 |
| Baschurch Vale Management Company Limited | Shrewsbury | 2017 |
| Baschurch Walk Management Company Limited | Shrewsbury | 2018 |
| Base (Acton) Management Company Limited | Hertford | 2005 |
| Base (Brentwood) Management Company Limited | Shrewsbury | 2005 |
| Base Central NW1 Management Company Limited | Harlow | 2002 |
| Base Management Services Limited | Manchester | 2003 |
| Base One Holdings Ltd | Brighton | 2023 |
| Base Property Solutions Limited | London | 2019 |
| Base Shield Group Ltd | London | 2026 |
| Basecourse Limited | | 1990 |
| Basecraft Residents Association Limited | Hove | 1983 |
| Basecrown Residents Association Limited | Taunton | 1983 |
| Basedene Limited | Wimborne | 1992 |
| Basegear Residents Association Limited | Old Windsor | 1983 |
| Basepurpose Property Management Limited | London | 1994 |
| Bases Lane Management Company Limited | Bedford | 2021 |
| Basewhiz Limited | London | 1999 |
| Basford Management Company Limited | Nottingham | 2003 |
| Basford Mill (Management) Limited | Cambridge | 2006 |
| Basford Villa Driveway Limited | Newcastle | 1997 |
| Bash Property Ltd | Southampton | 2021 |
| Basher 1 Limited | Croydon | 2001 |
| Basher 2 Limited | Croydon | 2001 |
| Bashford Gate Management Company Ltd | Carrickfergus | 2025 |
| Bashforde Management Company Limited | Carrickfergus | 2019 |
| Bashfordsland Management Company Limited | Ballynahinch | 2005 |
| Basi 697 Limited | Ilford | 2025 |
| Basicland Registrars Holdings Limited | London | 2004 |
| Basicnote Property Management Company Limited | Reading | 1992 |
| Basil Estates Ltd | Northampton | 2021 |
| Basil Limited | Cheltenham | 1999 |
| Basil Mansions Management Company Limited | London | 1977 |
| Basildon Close (Sutton) Management Company Limited | Croydon | 2001 |
| Basilgrange Limited | Taunton | 1983 |
| Basin View Limited | Leicester | 2010 |
| Basing Drive Management Company Limited | Bexley | 1997 |
| Basing Way & Basing Close Residents Association Ltd | Thames Ditton | 2017 |
| Basingstoke Lettings Limited | Basingstoke | 2003 |
| Basingstoke Softeners Limited | Tadley | 2003 |
| Baskerville Court Management Company (Neasden) Limited | Edgware | 1997 |
| Baskerville Gardens Freehold Limited | London | 2017 |
| Baskerville Residents Management Company Ltd | Croydon | 2022 |
| Baslow Court (Eastbourne) Management Company Limited | Seaford | 2013 |
| Basrall Limited | Bristol | 1986 |
| Bass Cottages Management Company Ltd | Loughborough | 2024 |
| Bass Management Group Limited | Newport | 2018 |
| Bass Property Solutions Limited | Liverpool | 2026 |
| Bassbray Management (Malden Court) Limited | Surbiton | 1976 |
| Bassetmain Limited | London | 1982 |
| Bassett Court Residents Association Limited | Hove | 1968 |
| Bassett Court RTM Company Limited | Leighton Buzzard | 2014 |
| Bassett Green Management Limited | Sawbridgeworth | 1983 |
| Bassett House (Ladbroke Grove) Management Company Limited | London | 1998 |
| Bassett House Freehold Limited | New Milton | 2025 |
| Bassett House Management Company Limited | London | 1979 |
| Bassett Mews Property Management Limited | Southampton | 2019 |
| Bassett Road Management Company Limited | London | 1983 |
| Bassett Wood Gardens Management Limited | Southampton | 2005 |
| Bassett Wood Mews Management Limited | Hoddesdon | 1988 |
| Bassetts (Tatsfield) Management Limited | Westerham | 2013 |
| Bassey Homes Limited | Manchester | 2024 |
| Bassi Property Holdings Ltd | Huddersfield | 2024 |
| Bassingbourn Fields Management Company Limited | Hatfield | 2020 |
| Bassingbourn Reach (Bassingbourn) Management Company Limited | New Milton | 2019 |
| Bassingham Road SW18 Management Company Limited | London | 2009 |
| Bassledene Road Management Company Limited | Sheffield | 2020 |
| Basswood Court Management Ltd | Shepton Mallet | 2022 |
| Bast House Farm Management Company Limited | Bury | 2024 |
| Basta Lettings Ltd | London | 2020 |
| Bastable House Freehold Company Ltd | Sudbury | 2013 |
| Bastable House Property Management Company Limited | Sudbury | 2012 |
| Bastas Property Limited | London | 2019 |
| Bastins Estate Management Company Limited | Southampton | 2006 |
| Bastion Freehold Ltd | London | 2024 |
| Bastion House (Amhurst Road) Management Company Limited | Harlow | 2021 |
| Baston Lane Huby Management Company Limited | York | 2024 |
| Baston Lodge Freehold Ltd | St. Leonards-On-Sea | 2019 |
| Bastwick Flat Management Limited | Hemel Hempstead | 2011 |
| Basuki Living Ltd | London | 2025 |
| Baswich Grange Management Company Limited | Salisbury | 2018 |
| BAT Gardens Maintenance Limited | Kingston Upon Thames | 2015 |
| BAT Holdings Ltd | Bloxwich | 2017 |
| Bata Residential Management Company Limited | Chorleywood | 2018 |
| Batchelor Court Management Company Limited | Ilford | 2018 |
| Batchelors Building Ltd | Northampton | 2014 |
| Batchmoat Limited | Worcester | 1991 |
| Batchstamp Limited | Leeds | 1986 |
| Batemans ROW 1-6 RTM Company Limited | Stanmore | 2025 |
| Bater Close Management Company Limited | London | 2022 |
| Bates Taylor Limited | Epping | 2024 |
| Bath City Lettings Management Ltd | Bath | 2019 |
| Bath Court (Thornbury) Management Company Limited | Clevedon | 2008 |
| Bath Court Investment Company Limited | Hove | 1987 |
| Bath Court Residents' Asociation (Maidenhead) Limited | Maidenhead | 1975 |