| "Come on" Social Network Limited | Information & communication | 2018 |
| "THE First" Gallery Ltd | Wholesale & retail | 2021 |
| 00319564 Limited | Professional & scientific | 1936 |
| 007 Transport Ltd | Transport & logistics | 2025 |
| 008 Transport Ltd | Transport & logistics | 2025 |
| 0086 Asian Supermarket Limited | Wholesale & retail | 2022 |
| 023 Consulting Limited | Professional & scientific | 2023 |
| 06752600 Limited | Wholesale & retail | 2008 |
| 06827459 Limited | Manufacturing | 2009 |
| 09288376 Ltd | Manufacturing | 2014 |
| 0TO1FINANCIALS Limited | Professional & scientific | 2025 |
| 1 - 20, Redwood Way Freeholds Limited | Households | 2012 |
| 1 Bevois Mansions Freehold Limited | Households | 2025 |
| 1 Call Electrical Ltd | Construction | 2023 |
| 1 Onion Ltd | Information & communication | 1997 |
| 1 Poole Road Limited | Real estate | 2023 |
| 1 Portland Street Ltd | Real estate | 2024 |
| 1,3,5 & 7 Meadow Lane Hamble (Management Company) Limited | Households | 2003 |
| 1-10 Swan Quay RTM Company Limited | Households | 2023 |
| 1-10 the Laurels RTM Company Limited | Households | 2023 |
| 1-12 Brunel Road RTM Company Limited | Households | 2021 |
| 1-2 Hambert Way RTM Company Ltd | Households | 2013 |
| 1-2 Loakes Court Limited | Households | 2000 |
| 1-5 Newitt Place RTM Company Limited | Households | 2024 |
| 1-72 White Star Place RTM Company Limited | Real estate | 2010 |
| 10 Hill Park Crescent Limited | Households | 2005 |
| 10 Hopton Road RTM Company Limited | Households | 2023 |
| 10 Second Ltd | Health & social care | 2019 |
| 10-16 Pentridge Way RTM Company Ltd | Households | 2017 |
| 100 Station Road (Southampton) Management Limited | Households | 2020 |
| 1000 Things Limited | Information & communication | 2006 |
| 102 Ltd | Construction | 2011 |
| 102 Waverley Road Limited | Households | 1989 |
| 11 Herbs Ltd | Manufacturing | 2023 |
| 11 Upper High Street Management Company Limited | Households | 2006 |
| 11-21 the Rowans RTM Company Limited | Households | 2023 |
| 11-24 Swan Quay RTM Company Limited | Households | 2023 |
| 110 Southwood Road Limited | Households | 2001 |
| 1107 Education Ltd | Education | 2025 |
| 11097893 Ltd | Hospitality | 2017 |
| 111 Wilton Avenue Management Company Ltd | Households | 2023 |
| 119 Highfield Lane Limited | Hospitality | 2020 |
| 11FINGERSMEDIA Ltd | Manufacturing | 2024 |
| 12 Ranelagh Grove Limited | Households | 1994 |
| 12 Sinclair Gardens Management Company Limited | Households | 2000 |
| 12/14 Manor Road Freehold Limited | Households | 2012 |
| 123 Hursley Road Management Limited | Households | 2011 |
| 123STAYS Limited | Real estate | 2022 |
| 124A Lower Northam Road Management Company Limited | Real estate | 2009 |
| 126 High Street Limited | Construction | 2010 |
| 129 Bernard Street Limited | Hospitality | 2023 |
| 129 Middle Road Company Limited | Households | 2008 |
| 12930264 Ltd | Professional & scientific | 2020 |
| 1298 Ltd | Hospitality | 2021 |
| 12TASTYGRILL Limited | Hospitality | 2018 |
| 13 Grove Road Limited | Households | 2025 |
| 13 Grove Road Southampton Ltd | Households | 2026 |
| 13-24 Brunel Road RTM Company Limited | Households | 2021 |
| 133 Bernard Street Limited | Hospitality | 2023 |
| 133 Waldegrave Road Management Ltd | Households | 2006 |
| 14 Northlands Road Southampton Limited | Households | 1999 |
| 14 Portland Street Residents Ltd | Households | 2010 |
| 14 Sinclair Gardens Management Company Limited | Households | 1975 |
| 1402201420012025 Ltd | Construction | 2014 |
| 143-145-147-149 Hiltingbury Road Freeholders Company Limited | Households | 2024 |
| 148 ST. James's Road Shirley Management Company Limited | Households | 2001 |
| 14TO24 Limited | Real estate | 1992 |
| 15 Cranbury Place RTM Company Limited | Households | 2026 |
| 15 Victoria Limited | Households | 2001 |
| 150DEGREE Prints Ltd | Manufacturing | 2019 |
| 156 Tremona Road Southampton Limited | Households | 2015 |
| 15HEROES Limited | Other services | 2018 |
| 16 Oxford Street Management Company (Southampton) Ltd | Households | 2012 |
| 161 NBS Limited | Real estate | 2018 |
| 163 Manor Road Management Ltd | Households | 2018 |
| 168 Chen Limited | Hospitality | 2021 |
| 1682 Productions Ltd | Construction | 2022 |
| 17 Southgate Street Winchester Management Company Limited | Households | 2000 |
| 1714 Group Limited | Financial services | 2013 |
| 173 Goldhurst Terrace Freehold Limited | Administrative & support | 2014 |
| 174 Randolph Avenue Limited | Households | 1992 |
| 176 Bitterne Road West Management Ltd | Households | 2021 |
| 17CC RTM Company Limited | Households | 2024 |
| 18-24 Banbury Avenue RTM Company Limited | Households | 2008 |
| 1851 Group Limited | Extraterritorial | 2025 |
| 19 Radipole Road Freehold Limited | Real estate | 2013 |
| 19 ST. Deny's Road (Portswood) Limited | Households | 1996 |
| 1994 Limited | Information & communication | 2021 |
| 19PB20 Limited | Transport & logistics | 2025 |
| 19SEVENTY Small Works Ltd | Construction | 2024 |
| 1A Autoheat Limited | Construction | 1974 |
| 1CARE Recruitments Ltd | Health & social care | 2026 |
| 1CLEAN Services Limited | Administrative & support | 2022 |
| 1COACH Ltd | Education | 2019 |
| 1DP Investment Management Ltd | Professional & scientific | 2024 |
| 1ROOF Ltd | Information & communication | 2006 |
| 1ST Active Ltd | Professional & scientific | 2010 |
| 1ST Call Sams Entertainments Limited | Arts & recreation | 2001 |
| 1ST Choice DRY Cleaners Ltd | Other services | 2014 |
| 1ST Choice Rubbish Clearance Ltd | Water & waste | 2016 |