| 6 Foot Diamond Limited | Gerrards Cross | 2024 |
| 6 GR Rope Access Limited | Shropshire | 2007 |
| 6 Hillside Clifton Management Limited | Bristol | 2007 |
| 6 Horwood Close Management Company Limited | Sutton Coldfield | 2006 |
| 6 Lancaster Drive Residents Association Limited | | 1988 |
| 6 Montagu Square Limited | Market Harborough | 1986 |
| 6 North Villas Freehold Limited | Birmingham | 2016 |
| 6 Old Devonshire Road Management Company Limited | | 1995 |
| 6 Pointer Limited | London | 2014 |
| 6 Primrose Gardens Freehold Ltd | London | 2016 |
| 6 ST Pauls Road Management Company Limited | Broadstairs | 2003 |
| 6 Stamford Road N.1. Limited | London | 1978 |
| 6 Stars Cleaning Limited | Sittingbourne | 2017 |
| 6 Under Limited | Westerham | 2006 |
| 6 VIP Limited | Stanmore | 2024 |
| 6 Weekly Window Cleaning Ltd | Seaton | 2026 |
| 6 Westgate Ltd | Edinburgh | 2017 |
| 6,7,8 & 9 Royal London Buildings Limited | Bexleyheath | 2004 |
| 6-8 the Grove Management Limited | Middlesex | 1978 |
| 60 Belfast Limited | Birmingham | 2014 |
| 60 Brompton Road Management Company Limited | Watford | 2006 |
| 60 Degrees Digital Ltd | London | 2016 |
| 60 Degrees Limited | London | 2015 |
| 60 Degrees Solutions Ltd | London | 2020 |
| 60 Kent Road Maintenance Ltd | Leeds | 2006 |
| 60 Maltby Street Freehold Company Limited | London | 2015 |
| 60 Netherwood RD London W14 0BG Limited | Shrewsbury | 2014 |
| 60 North Cleaning Ltd | Shetland | 2024 |
| 60 Uphill Developments Limited | London | 2014 |
| 60-66 MC Management Company Limited | Greenford | 2007 |
| 60-MS Ltd | Ashford | 2013 |
| 60/62 ST. Johns Road (Maintenance) Limited | | 1981 |
| 600 Feet Productions Limited | London | 2007 |
| 60612GHFL Limited | Saltcoats | 2011 |
| 60ABC Hatherley Road Management Limited | Sidcup | 1997 |
| 60TH Parallel SPV Ltd | London | 2025 |
| 61 Albert Road Management Company Limited | Staffordshire | 2003 |
| 61 Kenninghall Road Management Ltd | London | 2016 |
| 61 Mayfair Avenue Limited | Hornchurch | 2009 |
| 61 Ridge Road Ltd | London | 2007 |
| 61362 Limited | London | 2013 |
| 614CHU Ltd | Norwich | 2025 |
| 615 Investments Limited | Cambridge | 2018 |
| 615 Limited | London | 2019 |
| 615 Recruitment Ltd | Bolton | 2021 |
| 617 Recruitment Ltd | Lincoln | 2023 |
| 619 Parking Limited | Chesterfield | 2025 |
| 62 Fleet Street Ltd | London | 2006 |
| 62 Yarnells Hill Limited | | 2006 |
| 626 Consulting Limited | London | 2024 |
| 62K Limited | London | 2013 |
| 63 Balcombe Street Management Company Limited | London | 2004 |
| 63 Belsize Freehold Limited | Uk | 2007 |
| 63 Overhill Road Limited | East Dulwich | 2008 |
| 63 Songs Limited | London | 1979 |
| 63 SS Ltd | London | 2022 |
| 63 Stubbington Lane Management Company Limited | Fareham | 2006 |
| 6300 AC Limited | Barnet | 2011 |
| 632 Consultancy Limited | Parkgate | 2017 |
| 635 Wandsworth Road Management Ltd | Kingston Upon Thames | 2013 |
| 6393 Consulting Limited | Newbury | 2020 |
| 64 Carbon Compliance Services Limited | Lytham St. Annes | 2026 |
| 64 Carbon Ltd | Lytham St. Annes | 2024 |
| 64 Compayne Gardens Freehold Company Limited | London | 1998 |
| 64 Cromwell Avenue Freehold Ltd | London | 2017 |
| 64 Essex Road Ltd | Bognor Regis | 2018 |
| 64 Investments Limited | London | 2015 |
| 64 Sandmere Road RTM Company Limited | London | 2014 |
| 64 Savernake Road Ltd | London | 2001 |
| 64 Weston Park Crouch END Limited | London | 2000 |
| 642 Services Ltd | Waterlooville | 2019 |
| 643576 Ltd | Chesterfield | 2006 |
| 648 Ltd | Burnley | 2018 |
| 64M Limited | Bolton | 2017 |
| 65 Denbigh Limited | Coventry | 2017 |
| 65 Eaton Place Limited | London | 2010 |
| 65 Fordwych Road Limited | London | 2008 |
| 65 Miles Limited | London | 2024 |
| 65 Saxon Road London Limited | Coventry | 2012 |
| 652A-654B Woodborough Road Management Company Limited | Nottingham | 2018 |
| 656 Limited | Stockport | 2025 |
| 66 Books Limited | Tavistock Square | 2008 |
| 66 Church Road Records Limited | London | 2017 |
| 66 Contracts Ltd | Farnborough | 2010 |
| 66 Crowther Road Limited | Morden | 2017 |
| 66 Expeditions Cruises (UK) Company Limited | Cardiff | 2022 |
| 66 Investments Limited | London | 2019 |
| 66 Music Limited | London | 2021 |
| 66 Ross Street Ltd | London | 2024 |
| 66 Security Services Ltd | Dagenham | 2025 |
| 66 Storage & Distribution Limited | Tavistock Square | 2008 |
| 66-69 Windrush Court Management Limited | High Wycombe | 2012 |
| 666 Protection Ltd | Peterborough | 2025 |
| 666SERVICES Ltd | London | 2024 |
| 66B Limited | Warwick | 2012 |
| 67 Comyn Road Residents Limited | London | 2001 |
| 67 Harcourt Terrace Limited | Cobham | 1997 |
| 67 Vaughan Road Management Limited | Harrow | 2015 |
| 674RCV Limited | Helston | 2001 |
| 677 Media Management Ltd | Paisley | 2007 |