| 5R Strategic Consultancy Limited | Motherwell | 2024 |
| 5UE Ltd | Harrogate | 2015 |
| 5USIE Ltd | Harrogate | 2015 |
| 6 & 7 Northwood Gardens Limited | London | 1991 |
| 6 Adolphus Road Limited | London | 2002 |
| 6 Ashlake Road Management Limited | Newcastle Upon Tyne | 2002 |
| 6 Auckland Road Ltd | London | 2013 |
| 6 Belsize Park Gardens Management Company Limited | London | 2012 |
| 6 Blenheim Terrace Management Limited | Scarborough | 2007 |
| 6 Caine Road Horfield Management Company Limited | Bristol | 2007 |
| 6 D'S Limited | London | 2024 |
| 6 Denbigh Street Limited | Wanstead | 2005 |
| 6 Duffryn Close Limited | Cardiff | 2010 |
| 6 Eliot Hill RTM Company Limited | London | 2024 |
| 6 Farnaby Road Management Limited | Bromley | 1999 |
| 6 Hardy Road Management Company Limited | Poole | 2003 |
| 6 Heath Hurst Road, N.W.3. (Property Management) Limited | | 1978 |
| 6 Internet Limited | Manchester | 1998 |
| 6 Ltd | Newmarket | 2025 |
| 6 Portland RD Ltd | Kingsbridge | 2014 |
| 6 Selborne 1959 Limited | Worcester | 2013 |
| 6 Spenser Road Limited | London | 2001 |
| 6 ST Saviour's Management Company Limited | London | 2010 |
| 6 Sterne Street Limited | | 1998 |
| 6 Tankerville Road Management Company Limited | | 2005 |
| 6 the Crescent Portstewart Management Company Limited | Portstewart | 2015 |
| 6 Willow Road NW3 Limited | London | 1993 |
| 6 Wycliffe Limited | Woodford Green | 2002 |
| 6'ERS Property Limited | Portsmouth | 2015 |
| 6/6A Lines Street Property Management Limited | Morecambe | 2011 |
| 60 Anselm Road Management Company Limited | London | 2006 |
| 60 Minute Auctions Ltd | Mildenhall | 2021 |
| 60 Norwood Park Limited | London | 2007 |
| 60 Warleigh Road RTM Company Limited | Brighton | 2025 |
| 60-62 Upper Newtownards Road Management Company Limited | Belfast | 2022 |
| 6040 Ltd | Elland | 2024 |
| 606 Club Limited | | 1999 |
| 606 Edin Ltd. | Spott | 2004 |
| 61 Atheldene Road Management Limited | London, Sw11 3By | 2007 |
| 61 Cricketfield Road (RTE) Limited | London | 2008 |
| 61 Franciscan Road Freeholding Company Limited | London | 1995 |
| 61 Hallyburton RTM Company Limited | Hove | 2025 |
| 61 PS Ltd | London | 2009 |
| 61 ST. Andrews Road Limited | Uckfield | 2008 |
| 61 Wilton Road Limited | Bexhill-On-Sea | 2011 |
| 61/62 Barncroft Close Limited | Loughton | 2015 |
| 613 Fishponds Road (Management Company) Limited | Bristol | 2008 |
| 61A Oxford Road Management Company Limited | Abingdon | 2017 |
| 62 Bold Street Management Company Limited | Norwich | 2007 |
| 62 Bramber Road Management Company Limited | London | 2006 |
| 62 Britton Street Limited | | 1990 |
| 62 Fentiman Road Ltd | London | 2008 |
| 62 Mirabel Road Freehold Limited | London | 2021 |
| 62 Priory Road Limited | | 1989 |
| 62 Southwood Lane Management Company | London | 1983 |
| 620 Edin Ltd. | Edinburgh | 2004 |
| 621 Edin Ltd. | Edinburgh | 2003 |
| 6242Y.COM Limited | Herefordshire | 2008 |
| 62C Limited | Poole | 2017 |
| 63 Barber Shop Limited | Nottingham | 2009 |
| 63 Becmead Avenue Management Company Ltd. | London | 2012 |
| 63 Cornwall Gardens Freehold Company Limited | London | 2006 |
| 63 Gents Hair Design Limited | Nottingham | 2008 |
| 63 Hersham Road Management Company Limited | Walton-On-Thames | 2003 |
| 63 Perham Road Limited | Lancing | 1994 |
| 63 Shanklin Road Limited | East Sussex | 2003 |
| 63 Shelgate Limited | | 2002 |
| 63 ST John's Hill Grove Limited | | 2006 |
| 63 William Street Management Company Ltd | Portishead | 2008 |
| 63 Wilton Road Freehold Limited | Salisbury | 2014 |
| 63-69 Fairfax Ltd | London | 2024 |
| 633 Bath Road Bristol Property Management Limited | Bristol | 2011 |
| 64 Chestnut Grove Freehold Ltd | Lancaster | 2023 |
| 64 Greenford Avenue Limited | London | 2021 |
| 64 Grosvenor Avenue Limited | | 1983 |
| 64 Mill Lane Limited | Liverpool | 2017 |
| 64 Regents Park Road Limited | | 1998 |
| 64 UTP Freehold Management Ltd | | 2007 |
| 64 Windsor Road Limited | Ealing | 2003 |
| 64-66 ELM Park Road Freehold Limited | Hoddesdon | 2015 |
| 645 Fuels Ltd | Wisbech | 2025 |
| 65 & 67 Nevis Road Limited | London | 2009 |
| 65 Amyand Park Road Limited | Twickenham | 1997 |
| 65 Heyford Avenue Limited | London | 2008 |
| 65 Holborn Viaduct Limited | | 1990 |
| 65 Ritherdon Road Limited | London | 1998 |
| 65 Warwick Avenue Limited | London | 1996 |
| 65-104 Beaufort Mansions Freehold Limited | London | 2010 |
| 650 Taxis Ltd. | Edinburgh | 2008 |
| 66 Bramber Road Limited | London | 2015 |
| 66 Cheltenham Road London Limited | London | 2010 |
| 66 Front Street Limited | Billingham | 2015 |
| 66 High Street Management Company Limited | Eastbourne | 2011 |
| 66 Marmora Road Limited | | 1994 |
| 66 Ormiston Grove Limited | London | 2007 |
| 66 Parkhill Road Limited | | 2000 |
| 66 Regents Park Road Limited | London | 2014 |
| 66 Stanmer Park Road Freehold Limited | Brighton | 2012 |
| 66-68 Prospect Street Management Company Limited | Reading | 2022 |
| 666 Club Limited | Hitchin | 2008 |