| 3 FTC Ltd | Ilford | 2024 |
| 3 Futures Homes Ltd | Southampton | 2021 |
| 3 GEM Properties Limited | Birmingham | 2022 |
| 3 Gems Ventures Limited | Essex | 2001 |
| 3 George ST Ltd | Bedford | 2025 |
| 3 Gladstone Ltd | Manchester | 2022 |
| 3 Gladstone Road Management Company Limited | London | 2009 |
| 3 Glenarm Road Freehold Limited | London | 2026 |
| 3 Glenferness Avenue (2018) Limited | Fair Oak | 2018 |
| 3 Glenloch Road Hampstead Limited | London | 2001 |
| 3 Golden PIG Limited | Glasgow | 2023 |
| 3 Goldney Road Limited | London | 2007 |
| 3 Grace Hill Ltd | Guildford | 2014 |
| 3 Guys Trade Limited | London | 2020 |
| 3 Hall I`Th Wood Lane Management Limited | Bolton | 2006 |
| 3 Hall Road Management Limited (the) | Borehamwood | 1970 |
| 3 Hans Crescent Freehold Limited | London | 2017 |
| 3 Hardman Street Investments Limited | Manchester | 2006 |
| 3 Harrington Gardens Limited | London | 2026 |
| 3 Hart Collection Ltd | London | 2015 |
| 3 Heathland Road Ltd | London | 2020 |
| 3 Hereford Gardens (Freehold) Limited | London | 2020 |
| 3 Hillcroome Road Enfranchisement Company Limited | Surrey | 2006 |
| 3 Hillfield Avenue Limited | London | 2015 |
| 3 Homer Street Limited | Colindale | 2019 |
| 3 Homestead Road Limited | London | 2021 |
| 3 Houghton Square Limited | Chelmsford | 2008 |
| 3 Howard Road Westbury Park Management Limited | Bristol | 1997 |
| 3 Huyton Road Limited | Warwick | 2019 |
| 3 Idiots Home Ltd | Oldbury | 2021 |
| 3 Imperial Road Management Company Limited | Bristol | 2003 |
| 3 IS Family Ltd | Holywell | 2025 |
| 3 Isles Estates Ltd | Romford | 2025 |
| 3 Jays Developments Limited | Derby | 2024 |
| 3 Jays Property Limited | Derby | 2023 |
| 3 Jay’S Management Limited | Burgh Heath | 2022 |
| 3 Jesters Limited | Birmingham | 2009 |
| 3 Jewels Ventures Ltd | Bedford | 2024 |
| 3 K'S Machine Tool Limited | Machynys Llanelli | 1984 |
| 3 KAS Property Ltd | Birmingham | 2024 |
| 3 Kaurs Assets & Investments Limited | Cheltenham | 2023 |
| 3 Kellino Street Ltd | Wallington | 2019 |
| 3 Kensington Square (Freehold) Limited | London | 1999 |
| 3 Key Road Management Limited | Brentwood | 2014 |
| 3 Keys Accommodation Ltd. | Wolverhampton | 2021 |
| 3 Kingswood Management | Milton Keynes | 2026 |
| 3 Kinnoul Road Limited | London | 2009 |
| 3 Kngs Cottages Ltd | East Peckham | 2024 |
| 3 KPG Limited | Aylesbury | 1995 |
| 3 KT Limited | London | 2017 |
| 3 Ladbook Limited | London | 2025 |
| 3 Lansdowne Square (Hove) Freehold Limited | Hove | 2012 |
| 3 Lansdowne Square Weymouth Limited | Weymouth | 1987 |
| 3 Lanterns Limited | London | 2024 |
| 3 Lauderdale Road Limited | London | 2005 |
| 3 Leamington Road Villas Ltd | London | 2024 |
| 3 Legged Duck Ltd | London | 2025 |
| 3 Limes Ltd | Linton | 2021 |
| 3 Lionesses Property Ltd | Birmingham | 2024 |
| 3 Lions Investments (Northants) Ltd | Wellingborough | 2021 |
| 3 Little Maids Limited | | 2009 |
| 3 Little Pigs Property Ltd | Stockport | 2018 |
| 3 Lorton Street Limited | Cockermouth | 2021 |
| 3 Lucerne Ltd | London | 2025 |
| 3 Macfarlane Road Freehold Limited | London | 2006 |
| 3 MAN Renovations Ltd | Ashton-Under-Lyne | 2023 |
| 3 Marchwood Crescent Limited | | 1986 |
| 3 Mawdsley Street Bolton Limited | Rochdale | 2026 |
| 3 Melon Road Limited | London | 2019 |
| 3 Miles Dream Ltd | Gravesend | 2023 |
| 3 Minster Road Management Co Ltd | Watford | 2001 |
| 3 Montpelier Rise Limited | London | 2024 |
| 3 Montrell Road Limited | London | 2015 |
| 3 More London Centre Limited | London | 2010 |
| 3 Mount Pleasant Road Management Company Limited | London | 2023 |
| 3 Murston Road RTM Company Ltd | Sittingbourne | 2012 |
| 3 New END Ltd | London | 2010 |
| 3 New Parade (Worthing) Management Company Limited | Worthing | 2006 |
| 3 Northcote Road Ltd | London | 2018 |
| 3 Northumberland Park Comm Ltd | Middleton | 2024 |
| 3 Nugent Terrace Management Ltd | London | 2005 |
| 3 Oak Holdings Limited | Gravesend | 2023 |
| 3 Oaks Property Group Ltd | London | 2022 |
| 3 Oceans Limited | London | 2000 |
| 3 on the Road Estates Limited | London | 2024 |
| 3 Ovington Square Management Limited | London | 2009 |
| 3 P Paint Company (Stockport) Limited | Malmesbury | 1971 |
| 3 Palace Gate Management Limited | Watford | 2001 |
| 3 Paradise Gardens Limited | London | 2016 |
| 3 Park Crescent (Freehold) Limited | Leeds | 2022 |
| 3 Pelham (Sussex Freehold) Limited | Lewes | 2024 |
| 3 Pelling Street (Limehouse) RTM Company Limited | Bromley | 2024 |
| 3 PEN CEI Limited | Cardiff | 2020 |
| 3 Penguins Property Ltd | Preston | 2025 |
| 3 Penrith Invest Ltd | London | 2025 |
| 3 Penywern Road Limited | London | 2004 |
| 3 Percy Terrace Management Ltd | Plymouth | 2025 |
| 3 Perrymead Freehold Limited | London | 2011 |
| 3 Perwell Avenue Limited | London | 2025 |
| 3 Petals Limited | Staines-Upon-Thames | 2025 |