| THE Snail Restaurant Holdings Limited | Financial services | 2023 |
| THE Snail Restaurant Limited | Hospitality | 2023 |
| THE Source Bulk Foods UK Limited | Wholesale & retail | 2017 |
| THE Southampton Road Management Company Limited | Professional & scientific | 1997 |
| THE Spinney 53 Ltd | Wholesale & retail | 2021 |
| THE Style Room Eastleigh Ltd | Other services | 2018 |
| THE Talent Locker Ltd | Administrative & support | 2015 |
| THE Technology Connexion (UK) Limited | Professional & scientific | 1998 |
| THE Titti Group Ltd | Information & communication | 2026 |
| THE Trojans Club Limited | Arts & recreation | 2018 |
| THE Upside Corporation UK Ltd | Wholesale & retail | 2024 |
| THE Vape Factory.Co.Uk Ltd | Wholesale & retail | 2014 |
| THE Vtct Foundation | Education | 2013 |
| THE Weather Dome Ltd | Arts & recreation | 2012 |
| THE Wedding Experiences Ltd | Other services | 2026 |
| THE Winchester Indoor Bowls Centre Limited | Arts & recreation | 1996 |
| THE Window Division Ltd | Construction | 2022 |
| Theeya Engineering & Consultancy Ltd | Construction | 2018 |
| Thema Ltd. | Administrative & support | 2013 |
| Thermal Homes Limited | Professional & scientific | 2021 |
| Thermo-Tech Insullations Ltd | Construction | 2005 |
| Thind Subs Holdco Limited | Financial services | 2019 |
| Thingform Studio Limited | Professional & scientific | 2023 |
| Think Marketing Material Ltd | Administrative & support | 2007 |
| Think Physical Ltd | Other services | 2022 |
| Think Ventures Limited | Professional & scientific | 2004 |
| Think Worldwide Limited | Transport & logistics | 2007 |
| Third Vision Consultancy Limited | Information & communication | 2014 |
| Thirst-Quencher Limited | Professional & scientific | 2012 |
| Thirteen Thirty One Ltd | Professional & scientific | 2018 |
| Thisismatteblack Ltd | Wholesale & retail | 2024 |
| Thisisscale Limited | Professional & scientific | 2024 |
| Thom Thom Productions LLP | | 2011 |
| Thomas Wood Holdings Limited | Administrative & support | 2017 |
| Thomas Xplores Ltd | Wholesale & retail | 2025 |
| Thomkat Limited | Arts & recreation | 2021 |
| Thompson Hall Associates Ltd | Professional & scientific | 2026 |
| Thompson's News 'N' Food Limited | Wholesale & retail | 2015 |
| Thompsons Accountancy Limited | Professional & scientific | 2009 |
| Thorncombe Consulting Limited | Professional & scientific | 2023 |
| Thornden School Services Limited | Arts & recreation | 2011 |
| Thornton Personalised Products Ltd | Wholesale & retail | 2023 |
| Threaded Dynamics Ltd | Professional & scientific | 2026 |
| Three Brothers Rentals Limited | Real estate | 2024 |
| Three Peaks Music Ltd | Information & communication | 2021 |
| Three Pillars Safety Management Limited | Administrative & support | 2023 |
| Three Sixty Degrees Limited | Wholesale & retail | 2002 |
| Thrown Together Theatre Ltd | Arts & recreation | 2019 |
| Thrst Ltd | Wholesale & retail | 2019 |
| Tichborne Ovington (Freehold) Limited | Households | 2016 |
| Tickdoc Ltd | Professional & scientific | 2014 |
| Tickleford Preschool Limited | Education | 2015 |
| Tidal Hosting Ltd | Information & communication | 2023 |
| Tidal Maintenance Ltd | Construction | 2024 |
| Tiger INK Limited | Administrative & support | 2010 |
| Tiger Value Ltd | Wholesale & retail | 2020 |
| Tigerstripe Theatre Company Ltd. | Arts & recreation | 2017 |
| Tiki Aviation Ltd | Transport & logistics | 2015 |
| Tile Team Ltd | Construction | 2016 |
| Tiller Farm Consultancy Ltd | Professional & scientific | 2018 |
| TIM & Andy's Plumbing Services Limited | Construction | 2006 |
| Tima's Properties Ltd | Construction | 2026 |
| Timber Technology Past & Present Ltd | Manufacturing | 2013 |
| Timely Software Ltd | Information & communication | 2016 |
| Timsbury Fishery Limited | Professional & scientific | 1995 |
| Tint IT Ltd | Wholesale & retail | 2024 |
| TIS Captial Group Limited | Other services | 2026 |
| TIT for TAT Circus Ltd | Arts & recreation | 2021 |
| Titan EC Limited | Manufacturing | 2021 |
| Titan Property Lettings Ltd | Extraterritorial | 2025 |
| Titanium Vehicles Limited | Wholesale & retail | 2023 |
| Titeforce Limited | Wholesale & retail | 2022 |
| TJB Building Services Limited | Construction | 2016 |
| Tjhp Limited | Arts & recreation | 2009 |
| TJJ Builders Ltd | Construction | 2014 |
| TJR Audio Ltd | Manufacturing | 2022 |
| Tkoc Ltd | Arts & recreation | 2025 |
| TLC Marketing Limited | Financial services | 2023 |
| TLM Tree Care Limited | Administrative & support | 2017 |
| TMA Building Services Limited | Construction | 2014 |
| TMD Concept Ltd | Other services | 2020 |
| TMM Risk Solutions Limited | Professional & scientific | 2022 |
| TMP Plant Limited | Construction | 2020 |
| Tnikolov Ltd | Construction | 2014 |
| TNJ Care Ltd | Health & social care | 2015 |
| Tnpl Realisations Limited | Manufacturing | 1925 |
| Tocio Projects Limited | Construction | 2002 |
| Tollgate Property Investments Limited | Extraterritorial | 2008 |
| Tomjb Consultancy Ltd | Professional & scientific | 2026 |
| Tonyb Software Limited | Information & communication | 2007 |
| Tootsies Ltd | Health & social care | 2009 |
| Top Marque Cars Limited | Wholesale & retail | 2015 |
| Top Plumbing & GAS Ltd | Construction | 2007 |
| Top Point Roofing Ltd | Construction | 2022 |
| Top SET Academy Ltd | Education | 2024 |
| Top Tree Holdings Ltd | Financial services | 2023 |
| Topaz Refrigeration & Air Conditioning Limited | Manufacturing | 1979 |
| Topfawn Management Limited | Construction | 1993 |
| Topps Holdings Ltd | Real estate | 2021 |
| Torch TV Ltd | Administrative & support | 2021 |