| 3C Cycles Limited | Manufacturing | 2018 |
| 3CS Vectis Ltd | Professional & scientific | 2025 |
| 3D Cars Ltd | Wholesale & retail | 2023 |
| 3D Geosurvey Ltd | Construction | 2020 |
| 3D Home Automation Limited | Administrative & support | 2008 |
| 3D Home Solutions Ltd | Construction | 2024 |
| 3D Marketing Communication Ltd | Professional & scientific | 2025 |
| 3D Personnel Group Limited | Administrative & support | 2013 |
| 3D Printed Creations Ltd | Manufacturing | 2025 |
| 3D Specialist Contracting Ltd | Extraterritorial | 2015 |
| 3D Structural Detailing Services Limited | Information & communication | 2019 |
| 3D Wedding Figures Ltd | Professional & scientific | 2015 |
| 3DMITECH Ltd | Other services | 2019 |
| 3J Care Limited | Health & social care | 2025 |
| 3J Homes Limited | Real estate | 2025 |
| 3MB Engineering Limited | Manufacturing | 2014 |
| 3N Italian Ltd | Hospitality | 2021 |
| 3R Finance Ltd | Information & communication | 2015 |
| 3R Holdings Limited | Financial services | 2016 |
| 3R Paytech Ltd | Information & communication | 2015 |
| 3R Systems Ltd | Information & communication | 2013 |
| 3RD Project Design Limited | Professional & scientific | 2011 |
| 3RL Ltd | Real estate | 2017 |
| 3S Electrical (UK) Ltd | Construction | 2016 |
| 3SI Limited | Real estate | 2021 |
| 4 - 6 Havelock Road Company Limited | Real estate | 2017 |
| 4 Paws Pet Transport Ltd | Transport & logistics | 2019 |
| 40-55 Providence Park Residents Company Limited | Households | 2013 |
| 41 Waverley Road RTM Company Limited | Households | 2015 |
| 418 Limited | Professional & scientific | 2006 |
| 42 Middle Street Limited | Households | 2004 |
| 42 Phillimore Limited | Households | 1992 |
| 42-58 Clover Way Limited | Households | 1994 |
| 440 Cars Limited | Transport & logistics | 2019 |
| 4500 Rivers Limited | Hospitality | 2014 |
| 47 Bugle Street Management Company Limited | Households | 2018 |
| 47 Chippenham Road Limited | Households | 2007 |
| 47/49 Westridge Road Limited | Real estate | 2005 |
| 49 Marmion Road Property Company Limited | Households | 2025 |
| 4D Builders and Design Ltd | Construction | 2019 |
| 4E71 Ltd | Information & communication | 2020 |
| 4ENSE Limited | Wholesale & retail | 2026 |
| 4FRONT Recruitment Limited | Administrative & support | 2023 |
| 4I Hosting Ltd | Information & communication | 2025 |
| 4KR RTM Company Ltd | Households | 2024 |
| 4MAX Properties Ltd | Real estate | 2026 |
| 4MC Services Ltd | Construction | 2019 |
| 4N Properties Ltd | Real estate | 2025 |
| 4Q PUB Company Limited | Hospitality | 2014 |
| 4SLASH Ltd | Information & communication | 2017 |
| 4SMART Solutions Limited | Wholesale & retail | 2003 |
| 4TEK Electronics Limited | Manufacturing | 2024 |
| 4TUNE Investments Limited | Professional & scientific | 2015 |
| 4U Delivery Ltd | Transport & logistics | 2019 |
| 4WOODS Ecology Limited | Professional & scientific | 2003 |
| 4YOU.DIRECT Ltd | Transport & logistics | 2021 |
| 5 HAO Limited | Wholesale & retail | 2018 |
| 5 Knights Security Ltd | Administrative & support | 2024 |
| 5 Rivers Sports Bar & Grill Ltd | Hospitality | 2016 |
| 5 Squared Property Limited | Construction | 2022 |
| 5 Thornbury Avenue Management Company Limited | Households | 2004 |
| 5 Villages Group Ltd | Financial services | 2023 |
| 51-54 Navigators Way RTM Company Ltd | Households | 2021 |
| 52 Cobbold Road Management Company Limited | Hospitality | 1998 |
| 52 Downshire Hill Management Limited | Households | 1990 |
| 53 Stockwell Limited | Real estate | 1990 |
| 531 Ltd | Administrative & support | 2006 |
| 54 Howard Road RTM Company Ltd | Households | 2020 |
| 57 Commercial Finance Limited | Financial services | 2020 |
| 57 Shirley Road (Management) Limited | Households | 1991 |
| 58 Offley Road Management Company Limited | Real estate | 1996 |
| 59 Global Ltd. | Wholesale & retail | 2012 |
| 59 Thornhill Park Management Limited | Extraterritorial | 2002 |
| 5GS Security Services Limited | Administrative & support | 2021 |
| 5HE'S Electric Ltd | Construction | 2025 |
| 5TH Taste Catering Limited | Hospitality | 2023 |
| 5W New Ltd | Real estate | 2025 |
| 5W RD LLP | | 2022 |
| 6 & 7 Dundonald Close RTM Company Limited | Households | 2022 |
| 6 Cavendish Grove Limited | Households | 2023 |
| 6 Portland Street Management Company Limited | Households | 2001 |
| 6 Week (Southampton) Ltd | Arts & recreation | 2023 |
| 6-36 Newitt Place RTM Company Limited | Households | 2024 |
| 6-8 Taplin Drive Management Limited | Households | 1994 |
| 60 Eastgate Street (Winchester) Management Limited | Households | 2021 |
| 60 Southwood Lane Management Limited | Households | 2000 |
| 64 Belmore Lane RTM Company Limited | Households | 2008 |
| 65 Country Ltd | Information & communication | 2025 |
| 66 Millbrook Road East Freehold Limited | Households | 2025 |
| 660-666 Streatham High Road RTM Company Limited | Households | 2011 |
| 69 Church Road Management Company Limited | Households | 2021 |
| 69 Locks Road RTM Company Ltd | Households | 2022 |
| 6STREET Ltd | Information & communication | 2023 |
| 7 Cavendish Grove (Southampton) Ltd | Households | 2024 |
| 7 Rungs Ltd | Professional & scientific | 2026 |
| 7, 8, 9 and 10 Hambert Way RTM Ltd | Real estate | 2024 |
| 7-HILLS Kebabs Midanbury Ltd | Hospitality | 2024 |
| 70:20:10 Alliance LLP | | 2012 |
| 70C Station Road Management Company Limited | Households | 2003 |
| 74 Glengarry Road Management Limited | Real estate | 2007 |