| THE George Alton Limited | Hospitality | 2025 |
| THE Hairdresssir Limited | Other services | 2014 |
| THE Hidden GEM Sandwich Shop Ltd | Hospitality | 2023 |
| THE Ideal DIY Husband Limited | Construction | 2025 |
| THE Kings Theatre Trust Limited | Arts & recreation | 2000 |
| THE Lifelong Learning Group Limited | Real estate | 2002 |
| THE Little Accounting Company (Sussex) Ltd | Professional & scientific | 2024 |
| THE Little General Limited | Administrative & support | 2020 |
| THE Lodge (Southsea) RTM Company Limited | Households | 2019 |
| THE Massage Business Limited | Other services | 2016 |
| THE Money Market (UK) Group Ltd | Financial services | 2025 |
| THE Mortgage Hunter Group Ltd | Financial services | 2025 |
| THE Nail Lounge (PO5) Limited | Other services | 2022 |
| THE Nell Southsea Limited | Hospitality | 2024 |
| THE Nice Electrical Company Limited | Construction | 2008 |
| THE Nurtury Nursery Limited | Health & social care | 2025 |
| THE Octopus Arms Ltd | Hospitality | 2026 |
| THE Olive Tree Southsea Limited | Extraterritorial | 2020 |
| THE Philos Group Limited | Other services | 2001 |
| THE Planet of Fans Ltd | Hospitality | 2025 |
| THE Portsmouth Distillery Company Limited | Manufacturing | 2018 |
| THE Principal Law Partnership LLP | | 2010 |
| THE Property Boss Lady Ltd | Wholesale & retail | 2024 |
| THE Property Solutions Group Ltd | Real estate | 2019 |
| THE Protection Team Ltd | Financial services | 2018 |
| THE Real Condiment Co Ltd | Manufacturing | 2024 |
| THE Redshank Group Ltd | Information & communication | 2015 |
| THE Rifle Club Ltd | Hospitality | 2010 |
| THE Rookery Property Company Limited | Hospitality | 1993 |
| THE Savvy Money Girl Limited | Information & communication | 2025 |
| THE Secret Garden (Midhurst) Ltd | Administrative & support | 2017 |
| THE Silk Room Ltd | Hospitality | 2026 |
| THE Silkworth Project CIC | Health & social care | 2023 |
| THE Smartt Company Group Ltd | Professional & scientific | 2025 |
| THE Southsea Brewing Company Ltd | Manufacturing | 2014 |
| THE Southsea Decorating Company Ltd | Construction | 2025 |
| THE Southsea Deli Limited | Hospitality | 2017 |
| THE Southsea Florist Ltd | Wholesale & retail | 2025 |
| THE Spinney Management Company (Fareham) Limited | Households | 2022 |
| THE Terrace Apparel Limited | Manufacturing | 2021 |
| THE Untrained Leader Ltd | Professional & scientific | 2026 |
| THE Very Limited Company Limited | Information & communication | 2020 |
| THE Victory Chinese Ltd | Hospitality | 2023 |
| THE Vintage Boathouse Ltd | Wholesale & retail | 2019 |
| THE Visitor Attraction Consultants Limited | Professional & scientific | 2014 |
| THE Willows (Portsmouth) Management Limited | Households | 2010 |
| Thehumanarc Ltd | Information & communication | 2025 |
| Themonarch Limited | Hospitality | 2019 |
| Theunseenexists Limited | Professional & scientific | 2024 |
| Thevibetribe Ltd | Administrative & support | 2025 |
| Theyescreative Limited | Information & communication | 2013 |
| Think ACT Ltd | Professional & scientific | 2018 |
| Thinklikeadoctor Ltd | Public administration | 2023 |
| Thinktop Limited | Information & communication | 2022 |
| Third Gunwharf Gate Management Company Limited | Hospitality | 1987 |
| Thirteen Property Limited | Real estate | 2017 |
| Thirteen, 13A & 13B Clarendon Limited | Households | 2025 |
| This Creative Coalition Limited | Professional & scientific | 2018 |
| This IS Prome Limited | Financial services | 2020 |
| This Music Matters C.I.C. | Education | 2023 |
| Thomas Bramwell Outdoor Living Limited | Wholesale & retail | 2013 |
| Three Marines Enterprises Limited | Hospitality | 2014 |
| Threetops Limited | Hospitality | 2005 |
| Thunderbox Entertainment Ltd | Information & communication | 2019 |
| TID Consulting Ltd | Information & communication | 2020 |
| Tidyland Limited | Households | 2018 |
| Tigra Holdings Ltd | Real estate | 2025 |
| Tile Style (Hampshire) Ltd | Construction | 2017 |
| Tillian Estates Limited | Real estate | 2024 |
| Tillio Limited | Health & social care | 2015 |
| Tilly's Beds Limited | Wholesale & retail | 2017 |
| Tilly's Furniture Shop Limited | Wholesale & retail | 2017 |
| Tilsden Green Limited | Hospitality | 1996 |
| Timber Arch Carpentry Ltd | Manufacturing | 2021 |
| Timefor Ltd | Administrative & support | 2026 |
| Timezone Hair Ltd | Other services | 2020 |
| Tiny Dolphin Ltd | Wholesale & retail | 2026 |
| Titi Brickwork Ltd | Construction | 2025 |
| TJ Assets Limited | Real estate | 2017 |
| TJ Events Ltd | Hospitality | 2017 |
| TJS Brickwork & Construction Limited | Construction | 2025 |
| Tk's Beauty Limited | Other services | 2020 |
| TKE Healthcare Limited | Health & social care | 2009 |
| Tlrs (Residents Association) Limited | Households | 2009 |
| Tmdo Ltd | Professional & scientific | 2025 |
| TMK Portsmouth Limited | Hospitality | 2024 |
| TMR South Coast Group Ltd | Transport & logistics | 2015 |
| TMR South Coast Tyres Ltd | Wholesale & retail | 2018 |
| TO the Core Limited | Wholesale & retail | 2017 |
| TOM Yaman Pubs Ltd | Hospitality | 2024 |
| Tongue Literary Scouting Ltd | Information & communication | 2020 |
| Tonkins Portfolio Ltd | Real estate | 2022 |
| Toolkit Conduct Ltd | Education | 2025 |
| Top Z Ltd | Wholesale & retail | 2014 |
| Topgeezer Limited | Wholesale & retail | 2020 |
| Torpedo Ltd | Real estate | 2016 |
| Torque Tune Ltd | Wholesale & retail | 2023 |
| Tovo Food Limited | Hospitality | 2025 |
| Tower House Management Company Limited | Households | 1985 |
| Toyosikitchen Ltd | Hospitality | 2020 |