| 189 Prince of Wales Road Limited | Real estate | 2002 |
| 189 Productions Ltd | Information & communication | 2016 |
| 189 Richmond Road Limited | Other services | 2006 |
| 189 Trinity Road Management Limited | Households | 1993 |
| 189 Tufnell Park Road Limited | Real estate | 1983 |
| 189 Wardour Street Ltd | Hospitality | 2025 |
| 189 Whitehall Road Developments Limited | Construction | 2025 |
| 189 Whitehall Road Ltd | Administrative & support | 2022 |
| 1892 Management Company Limited | Households | 2000 |
| 1897 Barbers Ltd | Other services | 2024 |
| 1897 Gentlemen's Grooming Lounge Ltd | Other services | 2021 |
| 1899 Inc Limited | Arts & recreation | 2019 |
| 18A Property LLP | | 2011 |
| 18A-D North Common Road Freehold Limited | Professional & scientific | 2013 |
| 18APR Limited | Arts & recreation | 2018 |
| 18CR Management Ltd | Households | 2016 |
| 18F UK Holding Company Limited | Professional & scientific | 2012 |
| 18FIFTY Ltd | Professional & scientific | 2021 |
| 18GRAMS Ltd | Wholesale & retail | 2021 |
| 18K Group Ltd | Wholesale & retail | 2025 |
| 18K Ltd | Wholesale & retail | 2023 |
| 18K Productions Ltd | Information & communication | 2020 |
| 18KCW Consulting Ltd | Professional & scientific | 2014 |
| 18KINGSTONRD Ltd | Real estate | 2021 |
| 18MW Ltd | Real estate | 2022 |
| 18QA RTM Company Limited | Real estate | 2012 |
| 18QP Limited | Extraterritorial | 2018 |
| 18TD Ltd | Construction | 2022 |
| 18TH Floor Recordings Ltd | Information & communication | 2018 |
| 18TH Moon Records Limited | Information & communication | 2018 |
| 18TWELVE Ltd | Professional & scientific | 2008 |
| 18TWENTY2 Ltd | Health & social care | 2025 |
| 18WAYS Ltd | Information & communication | 2026 |
| 18YM Ltd | Professional & scientific | 2021 |
| 19 & 20 Canonbury Square Limited | Households | 2026 |
| 19 & 21 Aylesbury Management Company Limited | Households | 2011 |
| 19 - 24 Elmfield Mansions Residents Ltd | Households | 2008 |
| 19 / 21 Dumbarton Road Limited | Other services | 2008 |
| 19 Albert Street Limited | Households | 2003 |
| 19 Aldershot Road Management Limited | Real estate | 1997 |
| 19 Alexandra Drive Property Limited | Households | 2005 |
| 19 Alexandra Grove Management Company Limited | Households | 1985 |
| 19 Alexandra Road Freehold Limited | Households | 2023 |
| 19 Alfred Road Management Company Limited | Households | 2005 |
| 19 ALL Saints Road Limited | Extraterritorial | 2004 |
| 19 Alma Road Ltd | Households | 2025 |
| 19 Almeida Street Limited | Households | 1985 |
| 19 and 19A Southfield Road Limited | Administrative & support | 2011 |
| 19 and 20 Hans Place Limited | Households | 2006 |
| 19 and 21 Abbey Road Limited | Households | 2008 |
| 19 and 21 Barmouth Road Limited | Real estate | 2023 |
| 19 Anson Road Management Company Limited | Households | 1995 |
| 19 Argyll Road RTM Company Limited | Households | 2019 |
| 19 Ashley Road Freehold Limited | Households | 2009 |
| 19 Auckland Road Limited | Households | 2015 |
| 19 Barnard Hill Limited | Households | 2013 |
| 19 Belsize Park Ltd | Households | 2026 |
| 19 Bennerley Road Limited | Households | 2020 |
| 19 Bennett Park (Blackheath) Limited | Households | 2019 |
| 19 Brackenbury Limited | Households | 2021 |
| 19 Bramshill Road Freehold Limited | Households | 2024 |
| 19 Bruce Grove Limited | Households | 2014 |
| 19 Buckingham Road Limited | Households | 1996 |
| 19 Buckleigh Road Ltd | Households | 2021 |
| 19 Bycullah Road (Enfield) Limited | Households | 2016 |
| 19 Camden Hill Road RTM Company Limited | Households | 2023 |
| 19 Camden Park Road RTM Company Limited | Households | 2022 |
| 19 Canfield Place (Flats) Limited | Real estate | 2014 |
| 19 Capital Ltd | Real estate | 2024 |
| 19 Castletown Road RTM Company Limited | Households | 2010 |
| 19 Champion Road Management Limited | Households | 2001 |
| 19 Chardmore Road Limited | Households | 2014 |
| 19 Charleville Circus Limited | Households | 2006 |
| 19 Charlwood Street Limited | Real estate | 2014 |
| 19 Chartfield Avenue Services Limited | Households | 1990 |
| 19 Chelsham Road Limited | Households | 2021 |
| 19 Chestnut Road Management Company Limited | Households | 2011 |
| 19 Chippendale Street (Management) Limited | Real estate | 2013 |
| 19 Cleveland Square Limited | Real estate | 2015 |
| 19 Clifton Avenue Limited | Households | 2018 |
| 19 Cobham Road RTM Company Limited | Households | 2006 |
| 19 College Crescent Limited | Real estate | 2012 |
| 19 Collingbourne Road Limited | Households | 2016 |
| 19 Collingham Place Limited | Households | 2013 |
| 19 Collingham Road Freehold Limited | Households | 2010 |
| 19 Cornwall Gardens (SW7) RTM Company Limited | Administrative & support | 2020 |
| 19 Cornwallis Crescent Management Limited | Households | 1992 |
| 19 Craven Hill Management Limited | Real estate | 2018 |
| 19 Cromwell Road RTM Company Ltd | Real estate | 2015 |
| 19 Crossfield Road NW3 Property Management Limited | Households | 2015 |
| 19 Crossley Street Freehold Limited | Households | 2026 |
| 19 Dale Grove Freehold Management Limited | Households | 2012 |
| 19 Dancer Road Limited | Households | 1988 |
| 19 Deerhurst Road Limited | Households | 2015 |
| 19 Dennington Park Road Limited | Hospitality | 2015 |
| 19 Douglas Road Limited | Real estate | 2024 |
| 19 Dundonald Road Management Limited | Extraterritorial | 2008 |
| 19 Dunstans Road Limited | Households | 2017 |
| 19 Durham Terrace RTM Company Limited | Households | 2008 |
| 19 Dyne Road NW6 Freehold Limited | Households | 2025 |