| 23 Leinster Terrace Limited | Real estate | 2025 |
| 23 Limited | Information & communication | 1999 |
| 23 London Investments Limited | Real estate | 2023 |
| 23 Lonsdale Road Limited | Hospitality | 2006 |
| 23 Loveless Limited | Wholesale & retail | 2021 |
| 23 Lydford Road RTM Company Limited | Extraterritorial | 2013 |
| 23 Lyme Street London Limited | Households | 2011 |
| 23 Lytton Grove Company Limited | Households | 2008 |
| 23 Manor Park RTM Company Limited | Households | 2017 |
| 23 Maple Road RTM Company Limited | Households | 2014 |
| 23 Marjorie Grove Ltd | Households | 2006 |
| 23 Marloes Road Freehold Limited | Real estate | 2013 |
| 23 Mayflower Road Management Company Limited | Households | 2009 |
| 23 Micheldever Limited | Real estate | 2017 |
| 23 Middle Street Limited | Real estate | 2022 |
| 23 Mildenhall Freehold Limited | Households | 2014 |
| 23 Montague Road Management Ltd | Real estate | 2024 |
| 23 Moreton Place Limited | Households | 1995 |
| 23 Motors Ltd | Wholesale & retail | 2023 |
| 23 Mount Street Limited | Households | 2002 |
| 23 New Road RTM Company Ltd | Households | 2025 |
| 23 Norbury Crescent Limited | Households | 2009 |
| 23 Northfield Road Ltd | Real estate | 2024 |
| 23 Nottingham Street RTE Company Limited | Households | 2013 |
| 23 Oaklands Grove (Freehold) Limited | Households | 2013 |
| 23 Ongar Road Limited | Households | 1998 |
| 23 Pember Road Freeholders Limited | Extraterritorial | 2012 |
| 23 Pembridge Crescent Limited | Households | 1991 |
| 23 Percy Road Management Co. Limited | Real estate | 2002 |
| 23 PGT Limited | Households | 1986 |
| 23 Pollards Hill North Ltd | Extraterritorial | 2011 |
| 23 Prentis Road RTM Company Limited | Professional & scientific | 2013 |
| 23 Property Group Ltd | Administrative & support | 2026 |
| 23 Queen's Gate (2000) Limited | Households | 1999 |
| 23 Queen's Gate Terrace Limited | Households | 2011 |
| 23 Queens Avenue Limited | Real estate | 1996 |
| 23 Rathbone Street Ltd | Real estate | 2024 |
| 23 Ravenhill Management Company Limited | Households | 2006 |
| 23 Recordings Limited | Information & communication | 2021 |
| 23 Redcliffe Street Management Company Limited | Households | 2001 |
| 23 Rivers Limited | Information & communication | 2019 |
| 23 Ronalds Road Management Company Limited | Real estate | 2006 |
| 23 Ropery Street Management Limited | Real estate | 2003 |
| 23 Rosary Gardens Freehold Limited | Households | 2009 |
| 23 Rosemount Limited | Professional & scientific | 2011 |
| 23 Rousden Street NW1 Limited | Households | 1999 |
| 23 Royal Crescent Residents Company Limited | Households | 2002 |
| 23 Rudall Crescent Ltd | Real estate | 2017 |
| 23 Rutland Park Freehold Company Limited | Real estate | 2015 |
| 23 Sears Street Limited | Households | 2015 |
| 23 Simonds Road Freehold Limited | Real estate | 2022 |
| 23 Sinclair Gardens Limited | Real estate | 2013 |
| 23 Sisters Avenue Ltd | Households | 2016 |
| 23 Snaps Limited | Information & communication | 2012 |
| 23 South Villas Limited | Real estate | 1999 |
| 23 Southey Road Limited | Real estate | 2019 |
| 23 Spa Hill Limited | Households | 2023 |
| 23 ST James Ltd | Real estate | 2025 |
| 23 ST James's Square Management Limited | Households | 2007 |
| 23 ST. John Grove Management Limited | Professional & scientific | 1989 |
| 23 Stanley Road Management Company Limited | Real estate | 2012 |
| 23 Stanwick Road Property Management Company Limited | Households | 2005 |
| 23 Station Road RTM Company Limited | Households | 2018 |
| 23 Stile Hall Gardens Property Management Limited | Households | 2024 |
| 23 Strathblaine Road (Freehold) Limited | Real estate | 2004 |
| 23 Studio Limited | Administrative & support | 2020 |
| 23 Sunderland Terrace Limited | Real estate | 2006 |
| 23 SW Limited | Construction | 2025 |
| 23 Swanleys Ltd | Professional & scientific | 2017 |
| 23 Talent Management Limited | Administrative & support | 2023 |
| 23 Tanza Road Limited | Households | 2016 |
| 23 Telecom Ltd | Information & communication | 2020 |
| 23 Telford Avenue Limited | Households | 2004 |
| 23 the Drive Management Limited | Households | 2001 |
| 23 Thurloe Square Limited | Financial services | 2021 |
| 23 Thurlow Road Limited | Households | 1982 |
| 23 Toft Mansion Limited | Real estate | 2023 |
| 23 Tooting BEC Gardens Residents Company Limited | Real estate | 1998 |
| 23 Tremadoc Road Limited | Households | 1999 |
| 23 Tremlett Grove Limited | Households | 1995 |
| 23 Treport Street Management Company Limited | Extraterritorial | 1983 |
| 23 Twentynine Ltd | Professional & scientific | 2022 |
| 23 Tyrwhitt RD Limited | Households | 2004 |
| 23 Walnut Ltd | Real estate | 2020 |
| 23 Walpole Street Limited | Households | 2009 |
| 23 Waverley Road Management Company Limited | Households | 2000 |
| 23 Wealth Advisory Limited | Professional & scientific | 2025 |
| 23 Webbs Road Limited | Households | 2023 |
| 23 Westbury Road Residents Limited | Households | 1982 |
| 23 Westcroft Square (Management Company) Limited | Professional & scientific | 2002 |
| 23 Westgate Terrace Ltd. | Households | 2001 |
| 23 Westwell Road RTM Company Limited | Households | 2012 |
| 23 WG Limited | Real estate | 2020 |
| 23 Wise Words Limited | Professional & scientific | 2021 |
| 23 Wonderland Avenue Limited | Information & communication | 2019 |
| 23 Wood Vale (Freehold) Limited | Real estate | 2017 |
| 23 World Limited | Professional & scientific | 2003 |
| 23 WTR Freehold Ltd | Households | 2016 |
| 23-25 Lowndes Square Limited | Households | 2006 |
| 23-25 Rutland Gate Freehold Limited | Households | 2009 |