| Thorp Consulting Ltd | Professional & scientific | 2019 |
| Thoughtful APE Ltd | Information & communication | 2022 |
| Three Cross Demolition (Southern) Limited | Extraterritorial | 2008 |
| Three Cross Demolition Limited | Construction | 1996 |
| Three Cross Metals Limited | Wholesale & retail | 2025 |
| Three Lanes Way Residents Management Company Limited | Households | 2022 |
| Threequality Ltd | Wholesale & retail | 2020 |
| Thrym Ltd. | Information & communication | 2015 |
| Thygesen Engineering Limited | Professional & scientific | 2017 |
| Thyme Contracts Limited | Construction | 2020 |
| Tidlino Ltd | Information & communication | 2025 |
| Tiffany Fleming Insight Limited | Information & communication | 2019 |
| Tilu Limited | Hospitality | 2010 |
| TIM Graham Consulting Limited | Information & communication | 2026 |
| TIM Normington Television Limited | Information & communication | 2006 |
| TIM Walker Communications Ltd | Information & communication | 2015 |
| Timber Trims Southern Limited | Manufacturing | 2003 |
| Timbers Tree Care Ltd | Administrative & support | 2025 |
| Timco Lettings Ltd | Real estate | 2024 |
| Time to Dance Ltd | Education | 2014 |
| Timson Carter Limited | Real estate | 2019 |
| Tina Bolton Photography Limited | Professional & scientific | 2006 |
| Tinkerdash Limited | Other services | 2017 |
| Tinman Consulting Limited | Information & communication | 2010 |
| Tintail Limited | Real estate | 1982 |
| Tiny Drops Ltd | Information & communication | 2012 |
| Tipped Ltd | Information & communication | 2015 |
| Tiptop IT Consulting Limited | Information & communication | 2024 |
| Titanite Consulting Limited | Information & communication | 2020 |
| Tivmanco Limited | Arts & recreation | 1996 |
| Tivoli Consulting Limited | Information & communication | 2026 |
| Tiwakawaka Limited | Information & communication | 2025 |
| TJA Consultancy Ltd | Real estate | 2026 |
| TJB Legal Services Ltd | Construction | 2007 |
| TJC Flooring Limited | Construction | 2006 |
| TJG Design Limited | Professional & scientific | 2021 |
| Tjgt Consulting Limited | Professional & scientific | 2021 |
| TJM Consultancy Limited | Information & communication | 2007 |
| TKC Consulting Limited | Information & communication | 2026 |
| TLB Properties Limited | Real estate | 1999 |
| TLR Interiors Limited | Construction | 2009 |
| TLS (Holdings) Limited | Financial services | 2002 |
| TM Plant Services Ltd | Manufacturing | 2024 |
| TMD Accountancy (Dorset) Limited | Professional & scientific | 2014 |
| TN Telesync Ltd | Construction | 2025 |
| Tnea Ltd | Professional & scientific | 2023 |
| TNF Property Ltd | Real estate | 2015 |
| TNT: Track N Trail Limited | Arts & recreation | 2004 |
| TOA Property Holdings Ltd | Real estate | 2022 |
| Toby Bear Properties Ltd | Real estate | 2024 |
| Toby Evans Financial Planning Ltd | Financial services | 2025 |
| Toby Fancy Decorating Contractor Ltd | Construction | 2015 |
| Tocks Talks Ltd | Information & communication | 2025 |
| Tojo Ltd | Information & communication | 2023 |
| TOM Burrows Ltd | Professional & scientific | 2023 |
| TOM French Blockchain Consulting Ltd | Information & communication | 2020 |
| Tomasa Consultants Limited | Professional & scientific | 2022 |
| Tomben Ltd | Administrative & support | 2019 |
| Tomedro Limited | Arts & recreation | 2014 |
| Tomos Digital Services Limited | Information & communication | 2026 |
| Tomrw Ltd | Information & communication | 2022 |
| Tonant Fabrications Limited | Professional & scientific | 1992 |
| Toogood Property Ltd | Real estate | 2023 |
| Tooltidy Ltd | Manufacturing | 2018 |
| Top Floor Music Limited | Information & communication | 2023 |
| Top Tier Access Solutions Ltd | Construction | 2021 |
| TOR View Consulting Ltd | Information & communication | 2022 |
| Torchbound Ltd | Financial services | 2017 |
| Tortoise AI Limited | Professional & scientific | 2025 |
| Total Cosmetic Solutions Ltd | Health & social care | 2025 |
| Total Laminate Systems Ltd | Manufacturing | 1993 |
| Total Protection Solutions Ltd | Administrative & support | 2009 |
| Total Spend Solutions Limited | Professional & scientific | 2023 |
| Touchpoint Kiosks Ltd | Manufacturing | 2022 |
| Tower South Investments Ltd | Construction | 2020 |
| Tower South Property Management Ltd | Households | 2019 |
| Towers (Corfe Mullen) Management Company Limited(The) | Households | 1980 |
| Towers DEV Limited | Information & communication | 2025 |
| Townfive Investments Limited | Wholesale & retail | 2018 |
| Toxteth O'Grady Ltd | Information & communication | 2022 |
| Tpgm Limited | Professional & scientific | 2021 |
| Tpip UK Limited | Information & communication | 2018 |
| Tprm Consultancy Ltd | Professional & scientific | 2024 |
| TPS (Southern) Ltd | Construction | 2013 |
| TR3S Consulting Ltd | Information & communication | 2018 |
| Track Car Composites Limited | Manufacturing | 2024 |
| Trade Grade Products Limited | Wholesale & retail | 1983 |
| Trade Growth Group Limited | Professional & scientific | 2023 |
| Trade Show Associates Ltd | Financial services | 2010 |
| Tradesurv Ltd | Information & communication | 2026 |
| Tradeycomps Ltd | Professional & scientific | 2026 |
| Tranquil Mortgage and Finance Ltd | Financial services | 2021 |
| Transform Advisory Limited | Professional & scientific | 2025 |
| Transformativ Ltd | Professional & scientific | 2019 |
| Transformative Consulting Ltd | Professional & scientific | 2023 |
| Transition Legal Limited | Professional & scientific | 2026 |
| Transport Dynamics Limited | Professional & scientific | 2024 |
| Travel DEN AIP Ltd | Administrative & support | 2024 |
| Travelrunners Ltd | Transport & logistics | 2017 |
| TRC Rowe Ltd | Information & communication | 2017 |