| 123BOOKING Ltd | Wholesale & retail | 2022 |
| 123CINE Ltd | Information & communication | 2022 |
| 123CPB Ltd | Professional & scientific | 2022 |
| 123DATA Ltd | Information & communication | 2018 |
| 123DOC Education Limited | Education | 2009 |
| 123DOC Limited | Education | 2000 |
| 123EASYGO Ltd | Wholesale & retail | 2025 |
| 123EDG63 Limited | Real estate | 2025 |
| 123GPG321 Limited | Professional & scientific | 2018 |
| 123NEXON Ltd | Wholesale & retail | 2026 |
| 123RF Technology Limited | Information & communication | 2012 |
| 123ROULETTE Ltd | Information & communication | 2026 |
| 123T Ltd | Wholesale & retail | 2010 |
| 123VOX Ltd | Education | 2025 |
| 123XYZ Ltd | Hospitality | 2026 |
| 124 & 126 Perry Rise (Forest Hill) Management Ltd. | Households | 1989 |
| 124 and 126 Tachbrook Street London SW1 Limited | Households | 2003 |
| 124 Anerley Road RTM Company Limited | Households | 2005 |
| 124 Barons Court Road Management Limited | Households | 2013 |
| 124 Brondesbury Road Management Limited | Real estate | 2003 |
| 124 Brondesbury Villas Limited | Households | 2020 |
| 124 Brownlow Road Ltd | Real estate | 2022 |
| 124 Clive Road Limited | Households | 2025 |
| 124 Devonshire Road (Chiswick) Freehold Limited | Households | 2008 |
| 124 Edith Road Residents Association Limited | Households | 1997 |
| 124 Fleet Road Limited | Extraterritorial | 1984 |
| 124 Gloucester Terrace (Management) Limited | Households | 1980 |
| 124 Grand Drive Ltd | Households | 2025 |
| 124 Hamilton Terrace (Management) Limited | Households | 1991 |
| 124 Harley Street Limited | Real estate | 2010 |
| 124 Holland Road Ltd | Households | 2017 |
| 124 Holland Road RTM Company Limited | Households | 2010 |
| 124 Landor Road Freehold Limited | Households | 2017 |
| 124 Marine Parade Brighton Limited | Households | 1997 |
| 124 Marlow Road Ltd | Real estate | 2018 |
| 124 Mildmay Road (Islington) Residents Limited | Households | 2003 |
| 124 Morden Road (Management Company) Limited | Households | 2023 |
| 124 Old Park Ridings Limited | Real estate | 2018 |
| 124 Queen's Gate Management Limited | Households | 2018 |
| 124 Regents Park Road NW1 Limited | Real estate | 1995 |
| 124 Retail Ltd | Wholesale & retail | 2026 |
| 124 Seymour Place Limited | Administrative & support | 2014 |
| 124 SH Ltd | Real estate | 2024 |
| 124 Shirland Limited | Households | 2023 |
| 124 the Elms RTM Ltd | Other services | 2014 |
| 124 TPR RTM Company Limited | Real estate | 2023 |
| 124 Uxbridge Road Limited | Real estate | 2018 |
| 124 Victoria Mini Market Ltd | Wholesale & retail | 2026 |
| 124 Victoria Rise Limited | Financial services | 2024 |
| 124-126 Petherton Road Limited | Households | 2024 |
| 1247 Trisomy CIC | Health & social care | 2023 |
| 12470936 Limited | Information & communication | 2020 |
| 124UK Ltd | Hospitality | 2024 |
| 125 & 127 Brookwood Road (London) Management Company Limited | Households | 2009 |
| 125 and 127 Sirdar Road Limited | Households | 2021 |
| 125 Castelnau Residents Association Limited | Households | 1980 |
| 125 Chadwick Road Limited | Households | 1998 |
| 125 Charlton Church Lane RTM Company Limited | Real estate | 2006 |
| 125 Dunstans Road Management Company Limited | Real estate | 2007 |
| 125 Endlesham Road Freehold Company Limited | Real estate | 2025 |
| 125 Englefield Road Limited | Households | 2022 |
| 125 F.P. Holdco Limited | Other services | 2025 |
| 125 F.P. Investment Limited | Other services | 2026 |
| 125 F.P. Propco Limited | Other services | 2025 |
| 125 Grosvenor Avenue Freehold Limited | Real estate | 2014 |
| 125 Group Limited | Transport & logistics | 2011 |
| 125 Hammersmith Grove Residents Management Limited | Extraterritorial | 2015 |
| 125 Hornsey Lane Limited | Real estate | 1974 |
| 125 KG Avenue RTM Company Ltd | Households | 2026 |
| 125 Kingsway Tenant Limited | Real estate | 2015 |
| 125 Lavender Sweep (Freehold) Company Limited | Households | 2012 |
| 125 Miles Ltd | Wholesale & retail | 2021 |
| 125 Mount View Limited | Households | 1993 |
| 125 Muswell Avenue Limited | Households | 2008 |
| 125 Norwood Limited | Real estate | 2017 |
| 125 OBS (Nominees 1) Limited | Extraterritorial | 2006 |
| 125 OBS (Nominees 2) Limited | Professional & scientific | 2006 |
| 125 OBS GP Limited | Professional & scientific | 2014 |
| 125 OBS Limited Partnership | | 2006 |
| 125 Ormside CIC | Arts & recreation | 2024 |
| 125 ST Thomas's Road Freehold Limited | Households | 2026 |
| 125 Trinity Road RTM Company Limited | Households | 2026 |
| 125 Wightman Road Management Company Ltd | Households | 2020 |
| 125 Wilberforce Road Limited | Administrative & support | 2005 |
| 125-133 London Road Ltd | Financial services | 2023 |
| 1251 Projects Limited | Administrative & support | 2025 |
| 126 Aldersgate Limited | Real estate | 2024 |
| 126 Amhurst Road RTM Company Limited | Real estate | 2005 |
| 126 and 128 Sangley Road RTM Company Limited | Real estate | 2023 |
| 126 Archway Road Ltd | Real estate | 2024 |
| 126 Baker Street Limited | Construction | 2023 |
| 126 Barry Road Ltd | Households | 2014 |
| 126 Brondesbury Management Ltd | Real estate | 2022 |
| 126 Cambridge Street Freehold Limited | Households | 2023 |
| 126 Cavendish Road Freeholders Limited | Households | 2016 |
| 126 Courthill Road RTM Company Limited | Households | 2022 |
| 126 Croxted Road Management Company Limited | Households | 2002 |
| 126 Dalston Lane Management Company Limited | Real estate | 2000 |
| 126 Dalyell Road (Freehold) Ltd | Households | 2024 |
| 126 Devonshire Road Limited | Real estate | 2015 |