| 42 Client Services Ltd | Information & communication | 2025 |
| 42 Clifton Gardens Limited | Households | 2010 |
| 42 Cloudesley Road (Freehold) Limited | Households | 2026 |
| 42 Colney Hatch Lane Limited | Households | 2017 |
| 42 Consort House Ltd | Real estate | 2022 |
| 42 Crunch Ltd | Information & communication | 2015 |
| 42 Dartmouth Park Road Management Ltd | Real estate | 2021 |
| 42 Decisions Ltd | Information & communication | 2025 |
| 42 Degrees Consultancy Ltd | Professional & scientific | 2025 |
| 42 Denton Road Management Limited | Real estate | 2013 |
| 42 Developments Limited | Construction | 2019 |
| 42 Devonport Road RTM Company Limited | Other services | 2019 |
| 42 DH Ltd | Real estate | 2023 |
| 42 Digital Consulting Ltd | Information & communication | 2025 |
| 42 Eagle Street Limited | Professional & scientific | 1998 |
| 42 Eardley Road Limited | Households | 2018 |
| 42 Edgwarebury Lane Limited | Real estate | 2002 |
| 42 Elderfield Road Management Company Limited | Households | 1996 |
| 42 Endymion Road Management Limited | Households | 1997 |
| 42 Ennismore Gardens Management Company Limited | Households | 1962 |
| 42 Entertainment Ltd | Information & communication | 2022 |
| 42 EP Management Limited | Households | 1999 |
| 42 Events Limited | Arts & recreation | 2015 |
| 42 Fairhazel Gardens Limited | Real estate | 2011 |
| 42 Fentiman Road Freehold Limited | Households | 2016 |
| 42 Fieldhouse Road Management Company Limited | Households | 1998 |
| 42 Fordwych Road Freehold Limited | Financial services | 2024 |
| 42 Fortis Green Freehold Limited | Real estate | 2010 |
| 42 Frobisher Road Limited | Professional & scientific | 2010 |
| 42 Gabriel Street Ltd | Households | 2007 |
| 42 Gayton Road Management Limited | Households | 2005 |
| 42 Gleneagle Road Limited | Professional & scientific | 1997 |
| 42 Gore Road Management Ltd | Households | 2012 |
| 42 Grams Ltd. | Administrative & support | 2021 |
| 42 Grange Park Limited | Hospitality | 1997 |
| 42 Grosvenor Road Management Company Limited | Real estate | 1990 |
| 42 Guernsey Grove Limited | Extraterritorial | 2002 |
| 42 Halford Road RTM Company Limited | Households | 2019 |
| 42 Heyford Avenue Limited | Households | 2015 |
| 42 High Street Wanstead Limited | Real estate | 2024 |
| 42 Hillfield Avenue Flat Owners Limited | Households | 2012 |
| 42 Holborn FBE Ltd | Hospitality | 2020 |
| 42 Holborn Ltd | Hospitality | 2021 |
| 42 JDS Property Management Limited | Households | 2024 |
| 42 Kenilworth Road Limited | Real estate | 2004 |
| 42 Kensington Gardens Square Limited | Households | 1990 |
| 42 Kingsley Road Limited | Households | 1997 |
| 42 Ladbroke Grove Limited | Households | 1986 |
| 42 Lambolle Road Management Limited | Households | 2012 |
| 42 Leamington Road Villas Limited | Real estate | 1995 |
| 42 Legal Capital Limited | Financial services | 2022 |
| 42 Leisure Limited | Real estate | 2012 |
| 42 Lexham Gardens Limited | Households | 2018 |
| 42 Lilyville Road Management Limited | Real estate | 2001 |
| 42 Limes Grove Limited | Households | 2024 |
| 42 Living Ltd | Real estate | 2025 |
| 42 Lordship Road (FH) Limited | Real estate | 2018 |
| 42 M&P Ltd | Administrative & support | 2012 |
| 42 Manse Road Management Company Limited | Households | 1979 |
| 42 Mmgs Limited | Real estate | 2015 |
| 42 Montagu Square Limited | Households | 2013 |
| 42 Mount Park Road Freehold Limited | Real estate | 2023 |
| 42 Mount Park Road RTM Company Limited | Households | 2011 |
| 42 Mount Pleasant Road Freehold Ltd | Households | 2018 |
| 42 Mount Pleasant Road RTM Company Limited | Professional & scientific | 2017 |
| 42 Oulton Ltd | Real estate | 2020 |
| 42 Oxford Gardens Limited | Households | 2006 |
| 42 Peaks Ltd | Arts & recreation | 2020 |
| 42 Philbeach Gardens Limited | Households | 1993 |
| 42 Phoenix Road Limited | Construction | 2025 |
| 42 Pont Street Freehold Limited | Households | 2010 |
| 42 PS Ltd | Information & communication | 2024 |
| 42 Ravensbourne Park Limited | Households | 2004 |
| 42 Real Estate Limited | Real estate | 2025 |
| 42 Regina Road Limited | Real estate | 2002 |
| 42 Renfrew Road Company Limited | Households | 2014 |
| 42 Renfrew Road RTM Company Limited | Households | 2013 |
| 42 Riggindale Road Limited | Hospitality | 2012 |
| 42 Risk Management Limited | Financial services | 2024 |
| 42 Rusthall Avenue Limited | Households | 2024 |
| 42 Saltram Crescent Limited | Real estate | 2004 |
| 42 Solon Road Ltd | Real estate | 2013 |
| 42 ST Stephen's Avenue RTM Company Limited | Households | 2010 |
| 42 ST Stephens Gardens Limited | Real estate | 2004 |
| 42 Stanhope Gardens Highgate London Limited | Real estate | 2015 |
| 42 Stansfield Road RTM Company Ltd | Households | 2009 |
| 42 T P Service Management Ltd | Hospitality | 2019 |
| 42 Talbot Road Management Company Limited | Households | 1986 |
| 42 Technologies Ltd | Administrative & support | 2011 |
| 42 Telecom UK Limited | Information & communication | 2010 |
| 42 the Calls Leeds Hotel Limited | Hospitality | 2017 |
| 42 Things to DO Ltd | Information & communication | 2025 |
| 42 Think Ltd. | Professional & scientific | 1997 |
| 42 Thrale Road (Freehold) Company Limited | Households | 2018 |
| 42 Thurloe Square RTM Company Limited | Households | 2010 |
| 42 Tregunter Road Freehold Limited | Households | 1998 |
| 42 Tritton Road Limited | Households | 2015 |
| 42 UBS Reversion Limited | Real estate | 2020 |
| 42 Umfreville Road Ltd | Households | 2010 |
| 42 Upper Brook Ltd | Administrative & support | 2014 |