| Sweat Southsea Limited | Arts & recreation | 2014 |
| Sweet Spot Coffee Ltd | Wholesale & retail | 2009 |
| Swiatek Ltd | Information & communication | 2021 |
| Swiftlyne Talent Solutions Limited | Administrative & support | 2023 |
| Swing One Limited | Other services | 2018 |
| Switchtrade UK Ltd | Extraterritorial | 2012 |
| Swwim Limited | Professional & scientific | 2018 |
| SY & SON Ltd | Health & social care | 2018 |
| Sydney's Hair Ltd | Other services | 2024 |
| Syfinity Limited | Extraterritorial | 2017 |
| Synergia Inc Limited | Agriculture & fishing | 2022 |
| Syreeta Kelly Events & Consultancy Ltd | Hospitality | 2020 |
| Systematic Property Services Ltd | Real estate | 2022 |
| T & T Property Consultants Ltd | Real estate | 2019 |
| T Ware Developments Limited | Real estate | 2001 |
| T&L Brickwork & Building Services Limited | Construction | 2018 |
| T&T Trade Investments Limited | Financial services | 2021 |
| T&Z Delights Ltd | Wholesale & retail | 2020 |
| T.Gambrell Consultants Ltd | Professional & scientific | 2024 |
| T.K.J. Interiors Ltd | Wholesale & retail | 2007 |
| Tackle Suicide CIC | Health & social care | 2026 |
| Tafitech Ltd | Information & communication | 2023 |
| Tagowa Limited | Health & social care | 2011 |
| Tagshaw Consulting Limited | Information & communication | 2014 |
| Takenorth Limited | Hospitality | 1986 |
| Talent Included Ltd | Administrative & support | 2024 |
| Talez Limited | Hospitality | 2025 |
| Tall Stories Creative Limited | Professional & scientific | 2019 |
| Tamadar I SP OOZ Ltd | Wholesale & retail | 2026 |
| Tamooca Limited | Construction | 2025 |
| Tanikes Global Ltd | Mining & quarrying | 2023 |
| Tanzlo Ltd | Wholesale & retail | 2024 |
| Target Electrical Services Ltd | Construction | 2015 |
| Tarling Holdings Ltd | Real estate | 2026 |
| Tashkyle Healthcare Ltd | Health & social care | 2014 |
| Tasmine Catering Ltd | Hospitality | 2013 |
| Taste 2 Taste Ltd | Hospitality | 2020 |
| Tastybud Limited | Professional & scientific | 2010 |
| Tattva International Education Consultancy Ltd | Education | 2025 |
| Tautt Limited | Financial services | 2014 |
| Tawson Limited | Construction | 2022 |
| Taylor Design and Build South Ltd | Construction | 2026 |
| Taylor Norrie Limited | Other services | 2012 |
| Taylored Training and Consultancy Services Limited | Information & communication | 2017 |
| TDH Installations Ltd | Information & communication | 2020 |
| Team Hot Stuff Ltd | Information & communication | 2019 |
| Team Marine Limited | Administrative & support | 2007 |
| Teatime Delight Ltd | Hospitality | 2016 |
| Tecflexx Integrated Services Limited | Wholesale & retail | 2025 |
| Tech Inclusion Hub CIC | Education | 2026 |
| Techaon Limited | Information & communication | 2025 |
| Techgig Ltd | Wholesale & retail | 2025 |
| Techwerx Ltd | Real estate | 2006 |
| Teiu M Contractors Ltd | Construction | 2024 |
| Tekks Limited | Information & communication | 2024 |
| Temlat Property Co. Limited | Real estate | 1969 |
| Tempcation Limited | Real estate | 2025 |
| Temple Motors Ltd | Wholesale & retail | 2021 |
| TEN Thousand Hours Limited | Other services | 2017 |
| Tensen Solar Limited | Construction | 2024 |
| Tenzo Enterprise Limited | Wholesale & retail | 2024 |
| Teona Wingate Ltd | Wholesale & retail | 2021 |
| Terence Gardens Management Company Limited | Real estate | 2002 |
| Terramar Management Company Limited | Households | 2015 |
| TG Electrical Limited | Construction | 2006 |
| THE Agency Southsea Ltd | Households | 2024 |
| THE Anchorage Practice Limited | Health & social care | 2007 |
| THE Arclight Collective Ltd | Hospitality | 2025 |
| THE Arukah Academy Ltd | Education | 2024 |
| THE Astute Building Company Ltd | Construction | 2025 |
| THE Astute Group of Companies Ltd | Information & communication | 2021 |
| THE Attentive Building Company Ltd | Construction | 2014 |
| THE Beach Club Southsea Limited | Hospitality | 2005 |
| THE Beauty Rooms Southsea Ltd | Other services | 2019 |
| THE Billboard MAN Studio Limited | Professional & scientific | 2025 |
| THE Biltong Merchant Ltd | Wholesale & retail | 2019 |
| THE Biting Point Ltd | Administrative & support | 2025 |
| THE Bohemian Bespoke Outfitters Ltd | Manufacturing | 2024 |
| THE Bridge (Southsea) Limited | Hospitality | 2024 |
| THE Bruk Solutions Limited | Information & communication | 2015 |
| THE Canned Kitchen CIC | Hospitality | 2025 |
| THE Caravan Gallery C.I.C. | Professional & scientific | 2010 |
| THE Chemistry Collective Limited | Other services | 2025 |
| THE Chiltern Court Freehold Company Ltd | Households | 2008 |
| THE Coaching App Ltd | Information & communication | 2024 |
| THE COD Squad Ltd | Hospitality | 2023 |
| THE Daily Basket Ltd | Wholesale & retail | 2025 |
| THE Dietitian Method Ltd | Health & social care | 2021 |
| THE Drawing Office Limited | Real estate | 1995 |
| THE EGG Cart Limited | Hospitality | 2019 |
| THE Face MD Ltd | Other services | 2026 |
| THE Farj Brothers Ltd | Hospitality | 2024 |
| THE Farmhouse Sanctuary Ltd | Other services | 2023 |
| THE FD Service (South) Limited | Professional & scientific | 2021 |
| THE Flawless Guru Limited | Health & social care | 2022 |
| THE Forter Partnership Ltd. | Information & communication | 2009 |
| THE Foxgloves Freehold Limited | Real estate | 2014 |
| THE Freehold of 48 Campbell Road Limited | Real estate | 2015 |
| THE Freeholders of 109 Palmerston Road Southsea Limited | Households | 2018 |
| THE Gardens Management Company (Southsea) Limited | Real estate | 2023 |