| 123 Homes Limited | Cardiff | 2017 |
| 123 Isledon Road Flat Management Limited | London | 2001 |
| 123 Kensington Estates Ltd | London | 2023 |
| 123 Kneller Limited | London | 2021 |
| 123 Leyton Rental Limited | London | 2023 |
| 123 Management Company Limited | Warmley | 2019 |
| 123 Maple Leaf Business Ltd | Higham Ferrers | 2021 |
| 123 Middleton Road Management Company Limited | Buckingham | 2007 |
| 123 Prime Meridian Ltd | London | 2024 |
| 123 Properties Ltd | London | 2017 |
| 123 Propertree Limited | Wembley | 2024 |
| 123 Property and Building Consultancy Ltd | Cardiff | 2023 |
| 123 Property Investment Ltd | Hornchurch | 2024 |
| 123 Property Limited | Petersfield | 2020 |
| 123 Real Estates Ltd | London | 2024 |
| 123 ST. James Street Management Company Limited | Sandown | 2007 |
| 123 West END Lane Limited | London | 2025 |
| 123 West Property Group Ltd | Shrewsbury | 2022 |
| 123-125 Fonthill Properties Limited | Southgate | 2021 |
| 123-125 Gloucester Place RTM Company Limited | London | 2018 |
| 123/124 Lower Marsh Management Limited | London | 2000 |
| 12306884 Limited | Chorley | 2019 |
| 1234 Properties Ltd | Tewkesbury | 2021 |
| 1234 Property Limited | Stanmore | 2025 |
| 1234AB Limited | St Stephen | 2024 |
| 1234JB Limited | St Stephen | 2024 |
| 123CS Limited | Aberdeen | 2021 |
| 123EDG63 Limited | London | 2025 |
| 123ESTATEAGENT Ltd | Keston | 2018 |
| 123NDEA Ltd | Leeds | 2024 |
| 123STAYS Limited | Southampton | 2022 |
| 124 Brondesbury Road Management Limited | London | 2003 |
| 124 Brownlow Road Ltd | London | 2022 |
| 124 Castle Hill Freehold Limited | Reading | 2007 |
| 124 Harley Street Limited | London | 2010 |
| 124 Hendon Lane Limited | Borehamwood | 2015 |
| 124 High Street Management Company Limited | Gillingham | 2016 |
| 124 Maple Leaf Business Ltd | Higham Ferrers | 2021 |
| 124 Marlow Road Ltd | London | 2018 |
| 124 Old Park Ridings Limited | London | 2018 |
| 124 Oldfield Road Limited | Altrincham | 2022 |
| 124 Otley Road Limited | Leeds | 1997 |
| 124 Packington Street Limited | Woodbridge | 2011 |
| 124 Property Investments Ltd | Bristol | 2021 |
| 124 Regents Park Road NW1 Limited | London | 1995 |
| 124 SH Ltd | London | 2024 |
| 124 ST George's Terrace Freehold Limited | Newcastle Upon Tyne | 2018 |
| 124 TPR RTM Company Limited | London | 2023 |
| 124 UGR Management Co. Ltd. | Crowborough | 2007 |
| 124 Uxbridge Road Limited | London | 2018 |
| 124 Westexe South Management Company Limited | Exmouth | 2010 |
| 124/126/128 Courtlands Avenue Limited | Bromley | 2000 |
| 124A Lower Northam Road Management Company Limited | Southampton | 2009 |
| 125 Charlton Church Lane RTM Company Limited | London | 2006 |
| 125 DP Limited | Ashford | 2026 |
| 125 Dunstans Road Management Company Limited | London | 2007 |
| 125 Endlesham Road Freehold Company Limited | London | 2025 |
| 125 Grosvenor Avenue Freehold Limited | London | 2014 |
| 125 Hornsey Lane Limited | London | 1974 |
| 125 Kingsway Tenant Limited | London | 2015 |
| 125 London Road Management RTM Company Limited | Bexhill-On-Sea | 2016 |
| 125 Maryon Grove Freehold Limited | Charlton | 2015 |
| 125 Norwood Limited | London | 2017 |
| 125 Properties Ltd | Exeter | 2020 |
| 125 Property Investments Ltd | Bury St Edmunds | 2023 |
| 125 Richmond Park Road Management Company Limited | Bournemouth | 2004 |
| 125 ST Georges Drive SW1 Limited | Lyme Regis | 2016 |
| 125 Stroud Road Management Company Limited | Gloucestershire | 2003 |
| 125 WRS Ltd | Glasgow | 2021 |
| 125-127 Gordon Road Bristol Management Company Limited | | 1984 |
| 125/127 Brighton Road Worthing Limited | Worthing | 2000 |
| 1259 Investments Limited | Poole | 2020 |
| 12598903 Ltd | Benfleet | 2020 |
| 125SGT Limited | Newcastle Upon Tyne | 2021 |
| 126 Acomb Road Management Company Limited | York | 2019 |
| 126 Albion Street Ltd | Airdrie | 2021 |
| 126 Aldersgate Limited | London | 2024 |
| 126 Amhurst Road RTM Company Limited | London | 2005 |
| 126 and 128 Sangley Road RTM Company Limited | London | 2023 |
| 126 Archway Road Ltd | London | 2024 |
| 126 Atkins Road Limited | Clapham | 2013 |
| 126 Brondesbury Management Ltd | London | 2022 |
| 126 Cathedral Road Holdings Limited | Cardiff | 2021 |
| 126 Cathedral Road Management Limited | Cardiff | 2021 |
| 126 Dalston Lane Management Company Limited | London | 2000 |
| 126 Devonshire Road Limited | London | 2015 |
| 126 Duckett Street Freehold Limited | Worthing | 2011 |
| 126 Ebury Street RTM Company Limited | Brighton | 2008 |
| 126 Emmanuel Road (Freehold) Limited | Bletchingley | 2007 |
| 126 Fellows Road Freehold Limited | Kentish Town | 2022 |
| 126 High Road RTM Company Limited | London | 2004 |
| 126 Kings Road Limited | | 1994 |
| 126 Lavender Hill Ltd | Chester | 2014 |
| 126 London Road Management Company Peterborough Limited | Cambridge | 2021 |
| 126 Manor Heights Limited | Woodford Green | 2015 |
| 126 Property Limited | Leyland | 2025 |
| 126 Queenstown Road Limited | London | 1994 |
| 126/128 Lower Clapton Road (Hackney) RTM Company Limited | Eastbourne | 2016 |
| 126A New Park Road Management Limited | London | 2011 |
| 126A Westbourne Grove Limited | London | 2016 |