| Thermocom Limited | Construction | 2013 |
| Thesapphiregroup Limited | Administrative & support | 2014 |
| Thesquaredcircle Ltd | Information & communication | 2023 |
| Thesultanate Ltd | Information & communication | 2022 |
| Thetreadyzone Ltd | Wholesale & retail | 2025 |
| Thevelopers Limited | Information & communication | 2025 |
| Thewarith Ltd | Wholesale & retail | 2025 |
| Thewayin Limited | Real estate | 2009 |
| Theydon Bois Land Management Limited | Construction | 2020 |
| Thilaga Properties Limited | Real estate | 2020 |
| Think and Grow Limited | Information & communication | 2014 |
| Think Byte Limited | Information & communication | 2010 |
| Think Fire Defence Limited | Public administration | 2023 |
| Think Fire Doors Limited | Manufacturing | 2025 |
| Think Fit Ltd | Real estate | 2021 |
| Think Green Partners Ltd | Administrative & support | 2016 |
| Think Medical Ltd. | Health & social care | 2019 |
| Think Sweet Homes Ltd | Real estate | 2019 |
| Thinkme Knits Limited | Wholesale & retail | 2019 |
| Thinkwise Learning Ltd | Education | 2023 |
| Third EYE Protection Ltd | Financial services | 2023 |
| Third Gulliver Properties Group | | 1968 |
| Third Gulliver Property Management Limited | Real estate | 1968 |
| Third November Limited | Hospitality | 2016 |
| Thirsty Brands Ltd | Wholesale & retail | 2015 |
| Thirteen N&A Limited | Real estate | 2022 |
| Thirty Labs Ltd | Information & communication | 2026 |
| Thirty Three Mile END LLP | | 2021 |
| This IS Thingy Ltd. | Information & communication | 2016 |
| Thiyana Limited | Hospitality | 2010 |
| THK Services Limited | Wholesale & retail | 2023 |
| THM and Moosa Limited | Wholesale & retail | 2018 |
| THM Distributors Ltd | Wholesale & retail | 2024 |
| THM Properties Ltd | Real estate | 2025 |
| THN Accountants Ltd | Professional & scientific | 2018 |
| THN Trading Ltd | Wholesale & retail | 2020 |
| Thomas Bravo Ltd | Construction | 2022 |
| Thomas Hynes Properties Ltd | Real estate | 2024 |
| Thomas Louis Consultancy Ltd | Professional & scientific | 2025 |
| Thomas Management Ltd | Transport & logistics | 2025 |
| Thomas Mews Communal Limited | Real estate | 2026 |
| Thomas Ransom Property Ltd | Real estate | 2025 |
| Thomas Solution London Ltd | Real estate | 2025 |
| Thomashynes Estates Ltd | Professional & scientific | 2020 |
| Thompson & Hamilton Construction Ltd | Construction | 2026 |
| Thompson Real Estate Solutions Ltd | Real estate | 2024 |
| Thompson Sterling Ltd | Other services | 2019 |
| Thornby Farm Holding Ltd | Agriculture & fishing | 2020 |
| Thornby Farm Limited | Agriculture & fishing | 2025 |
| THP Engineering Ltd | Professional & scientific | 2018 |
| Thread and Needles Ltd | Manufacturing | 2025 |
| Threads by MHK Ltd | Wholesale & retail | 2025 |
| Three Aums Properties Ltd | Real estate | 2015 |
| Three Fifty Markets Ltd | Wholesale & retail | 2022 |
| Three G Convenience Limited | Wholesale & retail | 2018 |
| Three Oaks Limited | Real estate | 2014 |
| Three Palms Property Management LLP | | 2011 |
| Three SIX Pilates Ltd | Arts & recreation | 2022 |
| THREE8ONE Studio Ltd | Professional & scientific | 2026 |
| Thrice Ltd | Information & communication | 2025 |
| Thrillhub Limited | Wholesale & retail | 2024 |
| Thrive and Bloom Care Limited | Health & social care | 2021 |
| Thrive Day Nursery Ltd | Education | 2022 |
| Through the Lens Optics Ltd | Health & social care | 2022 |
| Through the Thirds Limited | Arts & recreation | 2013 |
| Thuba LLP | | 2020 |
| Thuna Paha Limited | Hospitality | 2026 |
| Thuraignana Villa Ltd | Hospitality | 2015 |
| Thurrock Play & Practice LLP | | 2024 |
| Thushi Ltd | Hospitality | 2017 |
| Thyoo Limited | Real estate | 2019 |
| TI Production Limited | Information & communication | 2025 |
| TIA Morris Limited | Manufacturing | 2026 |
| Tiara Nails Spa Ltd | Other services | 2018 |
| Tiara Nest Ltd | Wholesale & retail | 2025 |
| Tiateck Limited | Wholesale & retail | 2020 |
| Tibi Fire Ltd | Construction | 2026 |
| TIC Capital Ltd | Financial services | 2019 |
| TIC Invest Ltd | Financial services | 2019 |
| TIC Money Ltd | Financial services | 2019 |
| Tick N Trade Ltd | Wholesale & retail | 2023 |
| Tickhicks Ltd | Administrative & support | 2020 |
| Tickowt Ltd | Information & communication | 2025 |
| Ticora Limited | Wholesale & retail | 2025 |
| Tide Logistics Ltd | Transport & logistics | 2020 |
| Tidecom Ltd | Wholesale & retail | 2026 |
| Tidey Gardens Ltd | Administrative & support | 2013 |
| Tier IT Solutions Limited | Information & communication | 2026 |
| Tierhr Limited | Administrative & support | 2025 |
| TIG Group Limited | Construction | 2026 |
| Tigeez Limited | Transport & logistics | 2020 |
| Tiger Mobile Accessory Ltd | Wholesale & retail | 2018 |
| Tiger Sword Publishing Limited | Wholesale & retail | 2021 |
| Tiger Taverns Ltd | Real estate | 2014 |
| Tigers Transport Limited | Transport & logistics | 2024 |
| Tigersfield Limited | Real estate | 2025 |
| Tight Fit Limited | Extraterritorial | 2010 |
| Tighter Limited | Other services | 2025 |
| Tigo Prime Co., Ltd | Wholesale & retail | 2024 |
| Tigor Limited | Real estate | 2022 |