| 6 Estates Property Ltd | Real estate | 2024 |
| 6 Estelle Road Management Company Limited | Households | 1995 |
| 6 Farnan Road Freehold Limited | Households | 2006 |
| 6 FEB Foundation | Health & social care | 2023 |
| 6 Figure Ecom Limited | Wholesale & retail | 2025 |
| 6 Finborough Road Management Limited | Households | 1997 |
| 6 Flint Way Ltd | Real estate | 2025 |
| 6 Fordwych Road (Freehold) Ltd | Households | 2010 |
| 6 Freeholders Limited | Households | 2014 |
| 6 Frognal Gardens Residents Limited | Households | 2022 |
| 6 Furness Road Limited | Real estate | 2011 |
| 6 Gainsborough Street Ltd | Real estate | 2016 |
| 6 Gambole Road Management Limited | Households | 2006 |
| 6 Garlinge Road Limited | Real estate | 1999 |
| 6 Gatestone RD Management Co Ltd | Real estate | 2025 |
| 6 GC Lease Ltd | Wholesale & retail | 2021 |
| 6 Gilbey Road RTM Company Limited | Households | 2021 |
| 6 Glebe Street Limited | Professional & scientific | 2015 |
| 6 Glenloch Road Limited | Households | 2001 |
| 6 Goldhurst Terrace NW6 Limited | Real estate | 1998 |
| 6 Gosberton Road Management Ltd | Households | 2020 |
| 6 Goulton Road RTM Company Limited | Households | 2025 |
| 6 Great North Way Management RTM Company Limited | Households | 2024 |
| 6 Greycaine Road Ltd | Real estate | 2018 |
| 6 Halesworth Road Ltd | Households | 2015 |
| 6 Handel Street Limited | Professional & scientific | 2005 |
| 6 Handen Road Management Company Limited | Real estate | 2010 |
| 6 Harvist Road Limited | Households | 2016 |
| 6 Haselrigge Road Limited | Households | 1982 |
| 6 Heslop Road Freehold Ltd | Households | 2021 |
| 6 High Street Ltd | Construction | 2025 |
| 6 Hillfield Park RTM Company Ltd | Real estate | 2015 |
| 6 Holland Park Road Freehold Limited | Households | 2023 |
| 6 Hurstbourne Road Freehold Limited | Households | 2025 |
| 6 IVY Gardens Residents Company Limited | Households | 1997 |
| 6 Kenilford Road Management Limited | Real estate | 2002 |
| 6 Kensington Place Freehold Limited | Real estate | 2008 |
| 6 Kestrel Avenue Property Limited | Households | 2018 |
| 6 Kidderpore Avenue Limited | Real estate | 1995 |
| 6 King Edward's RD, Hackney Limited | Households | 2001 |
| 6 Kings Road (Wimbledon) Management Limited | Households | 1997 |
| 6 Kitchen (N14) Ltd | Hospitality | 2020 |
| 6 Kitchen Ltd | Arts & recreation | 2026 |
| 6 Lampton Road Limited | Real estate | 2021 |
| 6 Lanark Road Limited | Households | 1983 |
| 6 Lancaster Road Management Company Limited | Real estate | 2013 |
| 6 Layers Limited | Other services | 2019 |
| 6 Legge Lane Management Limited | Real estate | 2020 |
| 6 Lichfield Road Management Company Limited | Other services | 2003 |
| 6 Lofting Road Limited | Households | 2024 |
| 6 Lunham Road (Freehold) Limited | Households | 2015 |
| 6 Lymington Road (NW6) Limited | Households | 1998 |
| 6 Mapesbury Ltd. | Other services | 2008 |
| 6 Maplestead Road Freehold Limited | Households | 2020 |
| 6 Marlborough Crescent Management Company Limited | Households | 2022 |
| 6 Marmora Road (Freehold) Ltd | Households | 2017 |
| 6 Mattock Lane Limited | Real estate | 2013 |
| 6 Maude Road Management Limited | Households | 1998 |
| 6 Mepham Invest Ltd | Real estate | 2025 |
| 6 Minford Gardens (Management) Limited | Households | 2012 |
| 6 Model Terrace Ltd | Households | 2020 |
| 6 Moments That Matter Limited | Other services | 2021 |
| 6 Moring Road Limited | Real estate | 2015 |
| 6 Morna Road Management Limited | Households | 2009 |
| 6 Mornington Crescent Ltd | Real estate | 2011 |
| 6 Mount Road Freehold Limited | Households | 2024 |
| 6 Music Limited | Information & communication | 2019 |
| 6 New Archers Court Limited | Real estate | 2019 |
| 6 Newroad Ltd | Real estate | 2021 |
| 6 Nile Path Freehold Limited | Households | 2024 |
| 6 North Common Road Limited | Households | 2003 |
| 6 Oakwood Court Freehold Limited | Households | 2023 |
| 6 Offord Road N1 Limited | Households | 2016 |
| 6 Paddenswick Road Limited | Households | 2014 |
| 6 Palace Gate Property Managment Limited | Households | 2011 |
| 6 Palace Street Limited | Real estate | 2018 |
| 6 Paradise Gardens Limited | Real estate | 2016 |
| 6 Parliament Hill Management Company Limited | Real estate | 2013 |
| 6 Pears Technologies Ltd | Information & communication | 2026 |
| 6 Petherton Road Limited | Households | 2001 |
| 6 Phillimore Gardens Limited | Households | 2000 |
| 6 Pink Roses Ltd | Education | 2024 |
| 6 Point 5 Square Ltd | Real estate | 2019 |
| 6 Point 6 Square Ltd | Real estate | 2023 |
| 6 Point Energy Limited | Professional & scientific | 2015 |
| 6 Pointer Limited | Administrative & support | 2014 |
| 6 Pointer Sports Image & Communications Ltd | Information & communication | 2015 |
| 6 Primrose Gardens Freehold Ltd | Administrative & support | 2016 |
| 6 Queens Avenue, London N10 Limited | Households | 1997 |
| 6 Queens Gardens Management Limited | Real estate | 1996 |
| 6 Ramuz Drive RTM Company Limited | Households | 2007 |
| 6 Redcliffe Gardens Limited | Households | 2013 |
| 6 Redcliffe Square Freehold Limited | Households | 1997 |
| 6 Regents Park Road (Freehold) Limited | Households | 2000 |
| 6 Ribblesdale Road Freehold Company Limited | Hospitality | 2010 |
| 6 Ringstead Road Limited | Households | 2013 |
| 6 Rodway Road SW15 Ltd | Households | 2020 |
| 6 Sach Road Freehold Limited | Households | 2019 |
| 6 Sandall Road Freehold Limited | Real estate | 2019 |
| 6 Sandys Headlease Limited | Real estate | 2024 |