| Black Buttons Property Management Limited | Totnes | 2017 |
| Black Country Holdings Limited | Walsall | 2017 |
| Black Dog Structura Ltd | Poole | 2024 |
| Black Dyke Court (Holmfirth) Limited | Huddersfield | 2004 |
| Black Edge Close Management Company Limited | Buxton | 2021 |
| Black Forge Property Ltd | London | 2026 |
| Black Horse Croft Management Company Ltd | Wigan | 2021 |
| Black Horse Lodge Management Company Ltd | Newport Pagnell | 2021 |
| Black Horse Residents Management Company Limited | Middlesbrough | 2007 |
| Black Horse Walk (Worcester) RTM Company Limited | Worcester | 2009 |
| Black House Common Management Ltd | Cambridge | 2024 |
| Black Isle BA Properties Limited | Inverness | 2025 |
| Black Ladder Property Group Ltd | London | 2020 |
| Black Lion Mews Management Limited | | 1990 |
| Black Oak Management Services Ltd | Ilford | 2025 |
| Black Onyx Facilities Management Limited | Burslem | 2025 |
| Black OWL Property Ltd | Knutsford | 2019 |
| Black PAW Ltd | Newton Aycliffe | 2025 |
| Black PAW Property Limited | Nantwich | 2022 |
| Black Poplar Residents Association Limited | | 1997 |
| Black Rentals Ltd | London | 2026 |
| Black Ridge Hill Management Company Ltd | Limavady | 2025 |
| Black Rock Sands Management Company Limited | Stockbridge | 2008 |
| Black Rose Properties Ltd | London | 2021 |
| Black Sands Holdings Ltd | Burntisland | 2023 |
| Black Swan Court Management Co Limited | Doncaster | 1997 |
| Black Swan Mews Management Company Limited | Hertford | 1984 |
| Black Swan Residence Ltd | Birmingham | 2023 |
| Blacka Moor Gardens Management Company Limited | Sheffield | 2016 |
| Blackall Court Limited | Epsom | 2002 |
| Blackberry Barns Management Limited | Walsall | 2026 |
| Blackberry Court (Drayton) Management Company Limited | Langport | 2022 |
| Blackberry Court Management Company Limited | Plymouth | 2012 |
| Blackberry Hill Residents Management Company Limited | Weston-Super-Mare | 2018 |
| Blackberry Lane (Ashford) Management Company Limited | Chatham | 2018 |
| Blackberry Lane (Lingfield) Management Limited | Lingfield | 2022 |
| Blackberry Lane Kilkhampton Management Co Limited | Truro | 2022 |
| Blackberry Lane Management (Newmills) Ltd | Gilford | 2019 |
| Blackberry Lane Management Company Limited | Hillsborough | 2004 |
| Blackberry Park Residents Management Company Limited | Hurst | 2019 |
| Blackberry Way Management (NO.1) Limited | Stevenage | 1990 |
| Blackberry Way Management (NO.2) Limited | Milton Keynes | 1990 |
| Blackbird Freehold Management Ltd | Watford | 2022 |
| Blackbird Homes (Wilson Court) Management Limited | Ringwood | 2021 |
| Blackbird House Freehold Company Limited | Brighton | 2019 |
| Blackbird Properties Ltd | North East Lincolnshire | 2019 |
| Blackbolt Freehold Management Ltd | Pinner | 2010 |
| Blackbridge Lane Residents Association Limited | Croydon | 2012 |
| Blackbrook (Warrington) Management Company Limited | Macclesfield | 2003 |
| Blackbrook Mews Management Company Limited | Bromley | 2013 |
| Blackburn Avenue Property Co. Ltd | Beverley | 2017 |
| Blackburn Lodge Property Management (Didsbury) Limited | Manchester | 2004 |
| Blackdoors Freehold Investment Co. Ltd | London | 2024 |
| Blackdown Close Management Company Limited | Crawley | 2012 |
| Blackdown Heights (Crimchard) Management Company Limited | Salisbury | 2021 |
| Blackdown Management Company Limited | Yeovil | 1984 |
| Blackdown Meadow Management Company Limited | Taunton | 2020 |
| Blackerton Village Maintenance Limited | Ferndown | 2013 |
| Blackett Street (Freehold) Limited | London | 2020 |
| Blacketts Edge Freehold Limited | Amersham | 2024 |
| Blackfen (Sidcup) Management Company Limited | London | 1984 |
| Blackfield Green Estate Management Company Limited | Derby | 2018 |
| Blackfields Court Management Company Limited | Manchester | 1982 |
| Blackford Bridge Properties Ltd | Nottingham | 2020 |
| Blackfordby Barns Limited | Swadlincote | 2020 |
| Blackfox Property Management Ltd | Leigh-On-Sea | 2024 |
| Blackfriars (Chester) Management Company Limited | Chester | 1974 |
| Blackfriars (Market Harborough) Management Company Limited | Market Harborough | 2006 |
| Blackfriars and Greyfriars Management Limited | Shrewsbury | 2012 |
| Blackfriars House Management Company Limited | Burton On Trent | 2018 |
| Blackfriars Management Company Limited | Usk | 1985 |
| Blackfriars Residents Limited | King'S Lynn | 2007 |
| Blackgate Property Limited | Leeds | 2024 |
| Blackgate Property Management Limited | Weston-Super-Mare | 1982 |
| Blackgates Management Company (WKD) Limited | Wakefield | 2015 |
| Blackgreaves Management Limited | Sutton Coldfield | 1999 |
| Blackhall Mill (Management 2011) Limited | Sudbury | 2011 |
| Blackham Gardens (Boldmere) Management Company Limited | Swadlincote | 2023 |
| Blackham Properties Limited | Swansea | 2000 |
| Blackhaugh Community Farm Ltd | Perth | 2016 |
| Blackheath Court Management Company Limited | Exeter | 1987 |
| Blackheath Heights Property Company Limited | London | 1987 |
| Blackheath Management Co Limited | Colchester | 1988 |
| Blackheath Park Limited | London | 2024 |
| Blackheath Road (Block a) Management Company Limited | London | 1992 |
| Blackheath Road (Block B) Management Company Limited | London | 1992 |
| Blackheath Road (Block C) Management Company Limited | London | 1992 |
| Blackheath Road (Block D) Management Company Limited | London | 1992 |
| Blackheath Road (Block F) Management Company Limited | London | 1992 |
| BLACKHEATH70 Ltd | London | 2021 |
| BLACKHEATH72 Ltd | Greenwich | 2021 |
| Blackhill Barns Management Company Limited | Knutsford | 2013 |
| Blackhorse House Management Limited | Upminster | 2022 |
| Blackhorse Lane (Redbourn) Management Company Limited | Harpenden | 2026 |
| Blackhorse Lane Management Company Limited | Bristol | 2003 |
| Blackhorse Management Limited | London | 1987 |
| Blackhorse Mews Management Company Limited | Bolton | 2018 |
| Blackhorse View Energy Centre Management Company Limited | Coalville | 2020 |
| Blackhorse View Residents’ Management Company Limited | Holborn | 2020 |
| Blackhouse Properties Limited | Isle Of Barra | 2023 |