| THE Window Cleaning Company (South) Limited | Administrative & support | 2007 |
| THE Wingstitution Ltd | Hospitality | 2020 |
| THE Working Omnibus Museum Project Ltd. | Arts & recreation | 1992 |
| THE Yatra Events UK Limited | Arts & recreation | 2024 |
| THE Yeluri Group Limited | Other services | 2020 |
| THE ZEN Travel Ltd | Administrative & support | 2016 |
| Theartisticcrafts Ltd | Arts & recreation | 2024 |
| Theiceclub Ltd | Wholesale & retail | 2026 |
| Think Commercial Properties Limited | Real estate | 2011 |
| Thiru & Co Property Ltd | Real estate | 2025 |
| Thomas Chaney Electrical Services Ltd | Construction | 2022 |
| Thomson Long Ltd | Professional & scientific | 2026 |
| Three Sharks Ltd | Water & waste | 2026 |
| Threesec Management Ltd | Hospitality | 2020 |
| Thriving Community Project Ltd | Administrative & support | 2025 |
| Thss Holdings Limited | Financial services | 2026 |
| Thurgood Pubs Ltd | Hospitality | 2024 |
| Tiamboli Ltd. | Education | 2012 |
| Tiggis Healthcare Ltd | Health & social care | 2016 |
| Tijarat Bazaar Ltd | Wholesale & retail | 2024 |
| Tiki Taka Tours Ltd | Administrative & support | 2024 |
| Tilewright Limited | Construction | 2011 |
| Time and Data Delivery Systems Ltd | Information & communication | 2024 |
| Timfelly Ltd | Professional & scientific | 2019 |
| Timoun Consulting Ltd | Professional & scientific | 2024 |
| Tinop Care Ltd | Health & social care | 2019 |
| TIP Top 81 Builders Ltd | Construction | 2025 |
| Tisy Health UK Ltd | Extraterritorial | 2023 |
| Titan Plating Ltd | Administrative & support | 2023 |
| Tizao Group Ltd | Real estate | 2024 |
| Tjae Ltd | Extraterritorial | 2021 |
| TJM Brickwork Limited | Construction | 2005 |
| TKB Manchester Limited | Wholesale & retail | 2022 |
| Tkbuk Limited | Financial services | 2022 |
| TLJ Investment Ltd | Real estate | 2025 |
| TLO Property Ltd | Construction | 2025 |
| TMB Express Ltd | Hospitality | 2023 |
| TMF Estates Ltd | Real estate | 2025 |
| TMG Hospitality Ltd | Professional & scientific | 2024 |
| TMN Collectibles Ltd | Wholesale & retail | 2026 |
| TMP Aesthetics Ltd | Other services | 2019 |
| Tnds Ltd | Financial services | 2024 |
| TNS Consultancy Services Limited | Professional & scientific | 2022 |
| Toggle Engineering Limited | Administrative & support | 2015 |
| TOL Consulting Ltd | Professional & scientific | 2024 |
| Tony Harris Carpets Ltd | Construction | 2013 |
| Toocomfy Ltd | Wholesale & retail | 2024 |
| Top Bins Five a Side Ltd | Administrative & support | 2017 |
| Top Quality Roofing and Building Ltd | Construction | 2025 |
| Top ROX Management Services Limited | Real estate | 2015 |
| Top Survey Ltd | Professional & scientific | 2014 |
| Top to TOE Beauty and Aesthetics Ltd | Other services | 2025 |
| Top View Property Limited | Real estate | 2023 |
| Topic Developer Limited | Information & communication | 2016 |
| Toportyu Ltd | Construction | 2019 |
| Toppot Food Limited | Agriculture & fishing | 2015 |
| Toranet Limited | Information & communication | 2006 |
| Torgy Atlantic Limited | Manufacturing | 1997 |
| Toric Builders Limited | Construction | 2015 |
| Tosfran Ltd | Construction | 2022 |
| Total Care Contracting Ltd | Construction | 2025 |
| Total Installations Limited | Manufacturing | 1986 |
| Total Teamwear Limited | Wholesale & retail | 2010 |
| Tournest Ltd | Administrative & support | 2026 |
| Townsend Close Management Limited | Households | 2018 |
| Tozbeb Limited | Health & social care | 2023 |
| Trace Heating Specialist Services Limited | Construction | 2014 |
| Trace Thermal Limited | Construction | 2021 |
| Tracklite Ltd | Manufacturing | 2025 |
| Trackstar Fabrications Ltd | Wholesale & retail | 2024 |
| Trade Transfer Limited | Professional & scientific | 2008 |
| Tradefix Supplies Ltd | Wholesale & retail | 2026 |
| Tradeplot Ltd | Construction | 2023 |
| Trading Abundance Re-Insurance Agents Ltd | Professional & scientific | 2003 |
| Trading Co (Germany) Ltd | Professional & scientific | 2006 |
| Tragordon Management Company Limited | Households | 2016 |
| Traian Telecoms Groundworks Ltd | Construction | 2026 |
| Trained by Jones Ltd. | Arts & recreation | 2022 |
| Trainmeuk Ltd | Information & communication | 2026 |
| Travel & Transit Operations Ltd | Transport & logistics | 2026 |
| Travel Pinoy UK Ltd | Administrative & support | 2023 |
| Treeonettm Ltd | Hospitality | 2020 |
| Trek & Mountain Ltd | Information & communication | 2011 |
| Trendy Commerce Ltd | Wholesale & retail | 2017 |
| Tresix Healthcare Ltd | Health & social care | 2023 |
| Tri-Ant Properties Ltd | Real estate | 2023 |
| Trident Swimming Academy Limited | Education | 2026 |
| Trimlands Ltd | Administrative & support | 2025 |
| Triton Fins Limited | Education | 2024 |
| Triton Training Limited | Education | 2019 |
| Tritools Limited | Manufacturing | 2004 |
| Trix of the Trade Ltd | Manufacturing | 2024 |
| Trowes Lane (Swallowfield) Management Limited | Households | 2020 |
| True Telecommunications Services Ltd | Information & communication | 2026 |
| Truth Restaurant and Bar Ltd. | Hospitality | 2017 |
| TSC SPV Limited | Financial services | 2021 |
| TSF London Ltd | Real estate | 2021 |
| TT & BT Limited | Health & social care | 2013 |
| TTS Trusted Technical Services Ltd | Information & communication | 2019 |
| Tulk House International Limited | Wholesale & retail | 2018 |