| 6 Santos Road Limited | Households | 2018 |
| 6 Seeds 7 Stones Ltd | Hospitality | 2025 |
| 6 Seeds Limited | Professional & scientific | 2023 |
| 6 Services Ltd | Wholesale & retail | 2020 |
| 6 Shandon Road Management Company Limited | Real estate | 2002 |
| 6 Shardeloes Road Limited | Households | 2007 |
| 6 Sisters Avenue Limited | Hospitality | 2010 |
| 6 Spenser Road Limited | Extraterritorial | 2001 |
| 6 Squares Management Ltd | Real estate | 2023 |
| 6 ST Julians Farm Road Limited | Households | 1999 |
| 6 ST Lukes Avenue Limited | Households | 2024 |
| 6 ST Saviour's Management Company Limited | Extraterritorial | 2010 |
| 6 Stages Limited | Information & communication | 2017 |
| 6 Stamford Grove West Limited | Households | 2001 |
| 6 Stamford Road N.1. Limited | Administrative & support | 1978 |
| 6 Stanley Gardens Freehold Limited | Households | 2021 |
| 6 Stanthorpe Road Limited | Households | 2012 |
| 6 Stars INT Ltd | Wholesale & retail | 2022 |
| 6 Starts Property Ltd | Real estate | 2026 |
| 6 Station Parade Limited | Households | 2012 |
| 6 Studz Sports Ltd | Arts & recreation | 2025 |
| 6 Sumatra Road Freehold Limited | Households | 2014 |
| 6 Sunninghill Road Freehold Limited | Households | 2020 |
| 6 Thorndean Street Limited | Households | 2024 |
| 6 to 8 Wotton Road Freehold Ltd | Real estate | 2024 |
| 6 to 9 Denton Street Management Limited | Households | 2021 |
| 6 Tremadoc Road Management Company Limited | Real estate | 2000 |
| 6 Tressillian Crescent Freehold Company Limited | Households | 2019 |
| 6 Two 6 Ltd | Professional & scientific | 2013 |
| 6 Undine Street Management Company Ltd | Real estate | 2012 |
| 6 Union Square Management Limited | Households | 2017 |
| 6 Upper Grove Freehold Management Ltd | Households | 2024 |
| 6 Upper John Street Management Limited | Households | 1999 |
| 6 Vale END Ltd | Real estate | 2022 |
| 6 Valkyrie Ltd | Real estate | 2021 |
| 6 Vectors Ltd | Information & communication | 2020 |
| 6 Verulam Place RTM Company Ltd | Real estate | 2023 |
| 6 Warwick Road Limited | Households | 2021 |
| 6 WB Property Management Limited | Households | 2025 |
| 6 Well Road Investments Limited | Real estate | 1981 |
| 6 Wellington Crescent Management Company Limited | Households | 1988 |
| 6 Wellington Gardens Management Company Limited | Real estate | 1990 |
| 6 West Halkin Street Limited | Households | 1999 |
| 6 West View Ltd | Real estate | 2025 |
| 6 Westfield Park Clifton Bristol Management Company Limited | Real estate | 1977 |
| 6 Wetherby Gardens Management Company Limited | Households | 1978 |
| 6 Whiteley Road Ltd | Households | 2021 |
| 6 Willow Road NW3 Limited | Extraterritorial | 1993 |
| 6 Wilmington Square Limited | Households | 2002 |
| 6 Wilton RD Ltd | Real estate | 2023 |
| 6 Windmill Drive Freehold Limited | Households | 2020 |
| 6 Woodland Road N11 Management Company Limited | Real estate | 2014 |
| 6 Woodside Limited | Real estate | 2014 |
| 6 Wray Crescent Management Company Limited | Households | 1991 |
| 6 WSQ Limited | Real estate | 2019 |
| 6 York Road SW11 Ltd | Real estate | 2024 |
| 6&4 Limited | Financial services | 2023 |
| 6&6A Eton Garages Limited | Households | 2024 |
| 6&6A Tremaine Road Ltd | Households | 2023 |
| 6&8 Bodmin Street Limited | Households | 2022 |
| 6&8 Dalkeith Road Limited | Households | 2025 |
| 6-10 Challoner Court Limited | Households | 2017 |
| 6-10 Lowndes Square Freehold Limited | Households | 2008 |
| 6-10 Lowndes Square Management Company Limited | Households | 1984 |
| 6-10 Lowndes Square RTM Company Limited | Real estate | 2010 |
| 6-12A Borodin Close Limited | Households | 2001 |
| 6-12CE Limited | Real estate | 2013 |
| 6-16 Austin Street RTM Company Ltd | Households | 2018 |
| 6-18 Skipworth Road Freehold (London E9) Limited | Real estate | 2011 |
| 6-23 Games Ltd | Information & communication | 2025 |
| 6-7 Beauchamp Place Ltd | Hospitality | 2024 |
| 6-7 Grosvenor Place Club Limited | Other services | 2024 |
| 6-8 Eaton Place Freehold Limited | Real estate | 2018 |
| 6-8 Hans Crescent Freehold Limited | Households | 2019 |
| 6-8 Holly Hill Limited | Real estate | 2004 |
| 6-8 Vant Road RTM Company Limited | Households | 2008 |
| 6-8 West Hill Ltd | Construction | 2021 |
| 6. Smart Choice UK Ltd | Wholesale & retail | 2026 |
| 6.626 Ltd | Information & communication | 2021 |
| 6/6A Churton Place Limited | Real estate | 2011 |
| 6/6EYECARE Ltd | Professional & scientific | 2015 |
| 6/7 Cleveland Square Limited | Households | 1989 |
| 6/7 Egerton Gardens Freehold Ltd | Real estate | 2021 |
| 6/7 Vicarage Gate Ltd | Households | 2003 |
| 6/7/8 Onslow Gardens Limited | Households | 2004 |
| 60 - 62 Palace Road Freehold Limited | Professional & scientific | 2007 |
| 60 - 66 Rochester ROW (Management) Limited | Real estate | 1999 |
| 60 - 78 Holland SUB Ltd | Real estate | 2026 |
| 60 Aberdeen Road Management Company Ltd | Households | 2019 |
| 60 Acre Lane Ltd | Households | 2019 |
| 60 Aldgate Limited | Construction | 2021 |
| 60 and 62 Leman Street Limited | Real estate | 2020 |
| 60 Anerley Park RTM Company Limited | Households | 2023 |
| 60 Anselm Road Management Company Limited | Extraterritorial | 2006 |
| 60 Arodene Road Limited | Households | 2013 |
| 60 Barry Road Limited | Real estate | 2017 |
| 60 Belsize Road Limited | Households | 2023 |
| 60 Bishops Park Road Management Company Limited | Real estate | 2018 |
| 60 Bradbourne Street Freehold Limited | Households | 2018 |
| 60 Cadogan Square Freehold Limited | Households | 2011 |