| Thepensionspot Ltd | Professional & scientific | 2026 |
| Thepharmhaven Ltd | Wholesale & retail | 2021 |
| Therapeia Web Design Ltd | Information & communication | 2025 |
| Therapy Matrix Limited | Health & social care | 2023 |
| Therapy to YOU Ltd | Health & social care | 2026 |
| Therapy With Leanna Ltd | Health & social care | 2025 |
| Therese Care Services Ltd | Health & social care | 2024 |
| Thermal Energy Solutions Limited | Construction | 2024 |
| Thermal Heating Maintenance Limited | Other services | 2009 |
| Thermavein (Holdings) Limited | Financial services | 2014 |
| Thermavein Limited | Health & social care | 2012 |
| Theta Creations Limited | Health & social care | 2015 |
| Thetechscope Ltd | Wholesale & retail | 2023 |
| Thetrainingcompany Limited | Education | 2014 |
| Theuniversalplug Ltd | Wholesale & retail | 2025 |
| Theydon Holdings Limited | Financial services | 2026 |
| Theysync Limited | Information & communication | 2024 |
| Thfl Ltd | Hospitality | 2020 |
| Things Happen Ltd | Other services | 2025 |
| Things That Go Beep Ltd | Information & communication | 2018 |
| Think Commerce Ltd | Information & communication | 2013 |
| Think CRE8TIVE Group CIC | Education | 2018 |
| Thinkpro Limited | Professional & scientific | 2012 |
| Thinksimple Ltd | Information & communication | 2011 |
| Thirst Trap Xtreme Ltd | Wholesale & retail | 2025 |
| Thirteen Furniture Company Ltd | Wholesale & retail | 2024 |
| This IS Biltong Ltd | Manufacturing | 2021 |
| Thiseldome Holdings Ltd | Financial services | 2024 |
| THL (Bolton) Limited | Professional & scientific | 2008 |
| THN Events Ltd | Wholesale & retail | 2024 |
| Thomas England (North West) Limited | Construction | 2018 |
| Thomas Herbert Hair Ltd | Other services | 2018 |
| Thomas Neveu Limited | Professional & scientific | 2023 |
| Thomas Openshaw Ltd | Construction | 2024 |
| Thomas Recovery Ltd | Transport & logistics | 2004 |
| Thomas Taylor Roofing Ltd | Construction | 2025 |
| Thomas Whiting Ltd | Financial services | 2003 |
| Thomason’S Florist Ltd | Wholesale & retail | 2024 |
| Thomasson Homes Limited | Construction | 2025 |
| Thomasson Site Services Ltd | Transport & logistics | 2008 |
| Thomastay Ltd | Real estate | 2024 |
| Thompson Road 1972 Limited | Extraterritorial | 2014 |
| Thompson's Vehicle Recovery Limited | Transport & logistics | 2018 |
| Thorn 30 Limited | Real estate | 2012 |
| Thorn LEA Close Management Residents Association Limited | Households | 2006 |
| Thornbeer Limited | Financial services | 2021 |
| Thornbush Property Company Ltd | Real estate | 2026 |
| Thornton & Lowe Limited | Professional & scientific | 2011 |
| Thornton Advisory Partners Ltd | Professional & scientific | 2026 |
| Thornton Analytical Limited | Information & communication | 1997 |
| Thorntons Sport and Leisure Limited | Wholesale & retail | 2025 |
| Those Burger Places Ltd | Hospitality | 2019 |
| Those Engineers Limited | Information & communication | 1983 |
| Thoughtflakes Ltd | Professional & scientific | 2023 |
| Thougton Limited Limited | Wholesale & retail | 2025 |
| Thousand Hills MCR Limited | Arts & recreation | 2025 |
| THP01 Limited | Wholesale & retail | 2025 |
| Threadedvalley Ltd | Wholesale & retail | 2025 |
| Threadgold Construction Management Limited | Construction | 2018 |
| Threads Holdings Ltd | Manufacturing | 2018 |
| Three 27 Ltd | Professional & scientific | 2019 |
| Three Chords Production Limited | Information & communication | 2017 |
| Three Eleven Group Ltd | Professional & scientific | 2026 |
| Three Four Five Consulting Limited | Professional & scientific | 2020 |
| Three Four Five Property Ltd | Real estate | 2024 |
| Three Guys Coffee Ltd | Hospitality | 2020 |
| Three Lions Investors Ltd | Hospitality | 2022 |
| Three Planks Coffee Co Ltd | Wholesale & retail | 2023 |
| Three Sisters Investments Ltd | Real estate | 2020 |
| Three V IT Limited | Information & communication | 2019 |
| Three V Property Limited | Real estate | 2019 |
| Three White Birches Ltd | Information & communication | 2023 |
| THREE27 Holdings Limited | Financial services | 2025 |
| THREE27 Lettings Limited | Real estate | 2025 |
| Threeeightone Ltd | Hospitality | 2024 |
| Threemilestone Education Limited | Education | 2011 |
| Thrive Communication Therapy Ltd | Health & social care | 2024 |
| Thrive Education Limited | Education | 2018 |
| Thrive Rehab Limited | Other services | 2024 |
| Thrive Travel Ltd | Transport & logistics | 2023 |
| Thrive-Renew Limited | Professional & scientific | 2024 |
| Thriveful Ltd | Wholesale & retail | 2025 |
| THRIVEWELL247 Ltd | Wholesale & retail | 2025 |
| Throughline Marketing Limited | Professional & scientific | 2026 |
| Thumbs UP Care Group Ltd | Health & social care | 2019 |
| Thunder Netball UK Limited | Arts & recreation | 2008 |
| Thunter Limited | Administrative & support | 2022 |
| Thurrock Youth Zone Ltd | Health & social care | 2023 |
| Thursby Services Ltd | Other services | 2026 |
| Thyot Ltd | Transport & logistics | 2019 |
| TIA Projects Limited | Wholesale & retail | 2025 |
| Tiamava Limited | Wholesale & retail | 2013 |
| Tianzhu Limited | Wholesale & retail | 2025 |
| Tiarose Ltd | Wholesale & retail | 2018 |
| Tibala Concepts Ltd | Wholesale & retail | 2024 |
| Tick Tock Finance Solutions Limited | Other services | 2018 |
| Ticketfest Limited | Extraterritorial | 2025 |
| Tickleworks Ltd | Information & communication | 2026 |
| Tiddlers Swimschool Ltd | Education | 2012 |
| Tier One Project Services Limited | Administrative & support | 2011 |