| Blackhouse Rise Management Limited | Sandwich | 2026 |
| Blacklands Court RTM Company Limited | Hastings | 2005 |
| Blacklands Property Holdings Limited | East Sussex | 1997 |
| Blackley New Road Management Company One Limited | Manchester | 1998 |
| Blackmoor Court Flats Limited | Settle | 1982 |
| Blackmoor Grange Gillingham Management Company (Number 1) Limited | Taunton | 2005 |
| Blackmoor Grange Gillingham Management Company (Number 2) Limited | Paignton | 2005 |
| Blackmoor Grange Gillingham Management Company (Number 3) Limited | Paignton | 2005 |
| Blackmoorfoot (Huddersfield) Management Company Limited | West Malling | 2025 |
| Blackmore (Exeter) Flats Management Co. Limited | Exeter | 1988 |
| Blackmore Flats Limited | Sherborne | 1991 |
| Blackmore Manor Management Company Limited | Wheathampstead | 1993 |
| Blackmore Meadow (Stalbridge) Management Company Limited | Southend-On-Sea | 2019 |
| Blackmore Museum Management Company Limited | Salisbury | 2015 |
| Blackmore Park Flats Limited | Broadstone | 1992 |
| Blackmore Property Management Limited | Aylesbury | 2024 |
| Blackmore Way Residents (Wheathampstead) Limited | St Albans | 1994 |
| Blackmountain Management Limited | 150 Holywood Road | 2005 |
| Blackness Lane (Woking) Management Company Limited | Burgess Hill | 2018 |
| Blackpark Management Company Limited | Coleraine | 2003 |
| Blackpool Hotel Investment Limited | Cardiff | 2021 |
| Blackpool Road (Ansdell) Management Company Limited | Lytham St. Annes | 2024 |
| Blackpool Road (Kirkham) Management Company Limited | Wilmslow | 2021 |
| Blackpool Vine Court Management Limited | Blackpool | 1971 |
| Blackrock Hollow Management Limited | Belfast | 2018 |
| Blackrock Property Solutions Ltd | Bromsgrove | 2024 |
| Blackrose Property Service Limited | Romford | 2025 |
| Blacks Gate Apartments Management Company Limited | Carrickfergus | 2025 |
| Blacksmith Close Management Company Limited | Ashtead | 1978 |
| Blacksmith Meadow Management Company Limited | Callington | 2025 |
| Blacksmith Way Limited | Cinderford | 2022 |
| Blacksmiths Barns Ltd | Coventry | 2003 |
| Blacksmiths Forge Management Company Limited | Bath | 2002 |
| Blacksmiths Gardens (Thurlton) Management Company Limited | Great Yarmouth | 2018 |
| Blacksmiths Green (Ruddington) Management Company Limited | Tarporley | 2021 |
| Blacksmiths House (E17) Management Company Limited | London | 1996 |
| Blacksmiths Lane Management Company Ltd | Horncastle | 2021 |
| Blacksmiths Way (Laxfield) Management Company Limited | Ipswich | 2022 |
| Blackstaff BPM Limited | Newtownards | 2024 |
| Blackstaff Court Management Company Limited | Belfast | 2000 |
| Blackstaff House Management Company Limited | Belfast | 2000 |
| Blackstar Property Management Ltd | Harrow | 2020 |
| Blackstock Freehold Limited | London | 2017 |
| Blackstock Grange (Campsea Ashe) Residents Management Company Limited | Ipswich | 2012 |
| Blackstock Mews Residents Association Limited | | 2000 |
| Blackstone Hamilton Limited | Glasgow | 2022 |
| Blackstone Properties HD Ltd | Huddersfield | 2023 |
| Blackstone Properties NW Ltd | Oldham | 2018 |
| Blackstone Property Management Ltd | London | 2025 |
| Blackswarth House Limited | Bristol | 1984 |
| Blackswine Farm Management Limited | Newcastle Upon Tyne | 2005 |
| Blackthorn (Crowle) Management Company Limited | Birmingham | 2026 |
| Blackthorn Blocks 3 & 4 Valiant Fields Residents Management Company Ltd | Warwick | 2025 |
| Blackthorn Close (Heacham) Management Company Limited | Kings Lynn | 2018 |
| Blackthorn Close Management Company Limited | Kendal | 2022 |
| Blackthorn Close Residents Management Company Limited | Keswick | 2023 |
| Blackthorn Grove (Orpington) Management Limited | Orpington | 2016 |
| Blackthorn Lane Management Company Ltd | Horncastle | 2018 |
| Blackthorn Management Company at Blossom Park Limited | Ewloe | 2023 |
| Blackthorn Management Company Limited | Bicester | 1996 |
| Blackthorn Manor Management Company Limited | Lisburn | 2022 |
| Blackthorn Meadows Residents Management Company Limited | Salisbury | 2018 |
| Blackthorn Mews Flats Management Limited | Malvern | 1985 |
| Blackthorne Court (Staines Road) Management Limited | Bourne End | 2005 |
| Blackwall Reach Management Limited | Croydon | 1997 |
| Blackwall Road (BDW) Resident Management Company Limited | Marden | 2016 |
| Blackwater Court RTM Company Limited | Burnham On Crouch | 2007 |
| Blackwater House Residents RTM Company Limited | Newport | 2009 |
| Blackwater LEE Property Management Limited | Harlow | 2004 |
| Blackwater Lodge Properties Limited | Eastbourne | 1998 |
| Blackwater Manor Limited | Newport | 2011 |
| Blackwater Manor Management Company Ltd | Craigavon | 2017 |
| Blackwater Reach (Southminster) Management Company Limited | Colchester | 2019 |
| Blackwell Investment Company Limited | Maidstone | 1961 |
| Blackwell Management Company (East Grinstead) Limited | Croydon | 2007 |
| Blackwood Apartments Management Company Limited | Helens Bay | 2019 |
| Blackwood Court Apartments Management Company Limited | Belfast | 2018 |
| Blackwood Hall Ltd | Selby | 2005 |
| Blackwood House Property Management Company Limited | Leeds | 2023 |
| Blackwood Lane Management Company Limited | Limavady | 2013 |
| Blackwood Management Company (Culmore) Limited | Limavady | 2011 |
| Blade Court Residents Association Limited | Harlow | 2004 |
| Blade GJS Management Company Ltd | Manchester | 2023 |
| Blade House Limited | Croydon | 2012 |
| Bladerule Property Management Limited | London | 1984 |
| Blades Management Services Limited | Carrickfergus | 1985 |
| Blades Residents Association Limited(The) | Hammersmith London | 1986 |
| Bladon Lodge Residents Company Limited | Pinner | 1996 |
| Bladon Park Management Company Limited | Belfast | 2015 |
| Blaeberry Residents Company Limited | Loughton | 1989 |
| Blaen Treweryll CYF | Llanelli | 2024 |
| Blaengwawr Management Company Limited | Swadlincote | 2023 |
| Blagdon Cottages Limited | Broadstairs | 2018 |
| Blagdon House Estate Management Company Limited | Teddington | 2004 |
| Blagrave Management Company Limited | Croydon | 2008 |
| Blaigo Ltd | London | 2017 |
| Blair Court Management Limited | Poole | 2024 |
| Blair Court Residents' Association Limited | North Dulwich | 1966 |
| Blair Residential Property Ltd | Edinburgh | 2024 |
| Blaircrest Limited | Northwood | 1981 |