| 126CC Limited | Leicester | 2023 |
| 127 Denmark Hill (London) RTM Company Limited | Harlow | 2016 |
| 127 Drakefield Road Limited | London | 2023 |
| 127 East Street Bedminster Management Company Limited | Bristol | 2024 |
| 127 Ebury Street Development Ltd | Kingston Upon Thames | 2014 |
| 127 Foxhall Ltd | Iver | 2025 |
| 127 Harvist Road Ltd | | 2000 |
| 127 High Street Flats Limited | Marlborough | 2011 |
| 127 Homes Limited | Oldbury | 2015 |
| 127 Kingston Road Limited | London | 2018 |
| 127 Nether Street Limited | Loughton | 2014 |
| 127 Piccadilly Limited | London | 1986 |
| 127 Portnall Limited | London | 2014 |
| 127 Tredegar Road Management Services Limited | London | 2015 |
| 127 Union Grove Ltd | Aberdeen | 2022 |
| 127 West Ealing Management Company Limited | London | 2020 |
| 127 Wolmer Ltd | London | 2026 |
| 127-149 Mead Avenue RTM Company Ltd | Slough | 2016 |
| 127/129 Wandsworth Bridge Road Management Company Limited | London | 2016 |
| 12705493 Ltd | Birmingham | 2020 |
| 1274 Homes Ltd | London | 2021 |
| 1279 KST Castle Douglas (Freeholdco) Limited | Shirebrook | 2025 |
| 128 & 130 Boundaries Road Ltd | Hove | 2026 |
| 128 Albion Road Limited | London | 2026 |
| 128 Albion Road Residents Limited | London | 2005 |
| 128 Alexandra Road Management Company Limited | Gosport | 1990 |
| 128 Brondesbury Road Ltd | Loughborough | 2004 |
| 128 Cavendish Road Limited | | 1983 |
| 128 Caversham Road Management Company Ltd | Chertsey | 2025 |
| 128 Degrees Ltd | Nantwich | 2023 |
| 128 Fellows Road (Management) Limited | London | 2019 |
| 128 Grosvenor Place Limited | London | 2016 |
| 128 Holdings Ltd | Manchester | 2022 |
| 128 Lyndhurst Way Limited | | 2005 |
| 128 Melrose Avenue Holdings Limited | London | 2015 |
| 128 Moscow Drive Limited | Cirencester | 2024 |
| 128 Property Ltd | Bristol | 2024 |
| 128 ST Mary's Road Ltd | London | 2016 |
| 128 the Mount Limited | York | 2005 |
| 128 Trafford Road Limited | Diss | 2015 |
| 128 Victoria Rise Limited | London | 2002 |
| 12845796 Limited | Potters Bar | 2020 |
| 128NOR Ltd | Hitchin | 2019 |
| 129 Anyards Road Ltd | Cobham | 2023 |
| 129 Bayswater Road Limited | London | 2010 |
| 129 Blythe Road Ltd. | London | 2022 |
| 129 Cadogan Freehold Limited | London | 2023 |
| 129 Clophill Road RMC Ltd | Stevenage | 2019 |
| 129 Ellison Road Limited | London | 2025 |
| 129 Endlesham Road Limited | London | 2008 |
| 129 Harvist Road Limited | London | 2022 |
| 129 High Street Limited | Dufftown | 2018 |
| 129 Kennington Park Road Limited | | 2004 |
| 129 KHR (Management) Limited | London | 2018 |
| 129 Lampton RD Limited | Preston | 2022 |
| 129 Landor Road RTM Company Limited | London | 2003 |
| 129 Mildmay Road Management Company Limited | London | 2005 |
| 129 North Birkbeck Road Ltd | London | 2025 |
| 129 Property Limited | London | 2025 |
| 129-135 Saunders Ness Road RTM Company Limited | London | 2022 |
| 1290 Ltd | London | 2024 |
| 12964805 Limited | London | 2020 |
| 1297 Ltd | London | 2025 |
| 129SJR Limited | Edinburgh | 2021 |
| 12A & B Market Street Limited | Godalming | 2014 |
| 12A Barnpark Terrace Limited | London | 2009 |
| 12A Commercial Holdings Ltd | Eastleigh | 2026 |
| 12A Egremont Place Limited | Brighton | 2010 |
| 12A Investments Ltd | London | 2020 |
| 12A School Lane Ltd | Ramsgate | 2024 |
| 12ADVANCE Ltd | London | 2024 |
| 12AGC Ltd | London | 2024 |
| 12B Park Street Taunton Ltd | Taunton | 2010 |
| 12DW Investments Ltd | Calne | 2024 |
| 12ERIBROTHERS Ltd | Birmingham | 2026 |
| 12HR Ltd | Watford | 2022 |
| 12I Property Ltd | Bradford | 2023 |
| 12M Lettings Limited | Nottingham | 2017 |
| 12PD Limited | Nuneaton | 2023 |
| 12PLUS Property Ltd | Oxford | 2023 |
| 12S Property Ltd | Birmingham | 2019 |
| 12S Trading Ltd | Birmingham | 2018 |
| 12SG5 Limited | London | 2024 |
| 12SP Property Investments Limited | Horsham | 2025 |
| 12SPR Ltd | Hitchin | 2025 |
| 12TH MAN Ltd | London | 2006 |
| 12TH Origin Limited | Brighton | 2025 |
| 12TRENT Ltd | London | 2023 |
| 12Z Property Renovation Ltd | London | 2024 |
| 13 & 14 Lowndes Square Property Management Company Limited | Guildford | 1991 |
| 13 & 15 Nutwell Street Limited | Bromley | 2014 |
| 13 13 Properties Limited | Birmingham | 2025 |
| 13 13 Real Estate Limited | Uxbridge | 2019 |
| 13 Aberdare Gardens Limited | | 2005 |
| 13 Albion Drive Management Company Limited | | 2003 |
| 13 Archel Road Limited | London | 1995 |
| 13 Argyle Road Limited | Tarporley | 2014 |
| 13 Assets Limited | Wolverhampton | 2024 |
| 13 Avonmore Road RTM Company Ltd | London | 2014 |
| 13 Beach Lawn Ltd | Leeds | 2022 |