| Townfield NO 2 Limited | Extraterritorial | 2020 |
| Townhouse Childcare Limited | Education | 2002 |
| Townview Estates Ltd | Real estate | 2021 |
| Townview Properties Ltd | Real estate | 2019 |
| Towy Carpentry & Construction Services Ltd | Construction | 2025 |
| TOX Marketing & Consultancy Ltd | Other services | 2022 |
| Toyah Taylor Properties Ltd | Real estate | 2026 |
| Toysntoysntoys Limited | Wholesale & retail | 2019 |
| TPF Law Ltd | Professional & scientific | 2008 |
| TR Architectural Services Ltd | Administrative & support | 2017 |
| TR Marketing Ltd | Real estate | 2020 |
| Tracegains (UK) Limited | Administrative & support | 2023 |
| Tracey Jones Limited | Other services | 2008 |
| Trachtgut Holdings Ltd | Administrative & support | 2024 |
| Track Line Training Limited | Transport & logistics | 1997 |
| Trackline Medical Solutions Ltd | Transport & logistics | 2026 |
| Tradaar Ltd | Financial services | 2025 |
| Trade Crest Ltd | Wholesale & retail | 2025 |
| Trade SOS Technologies Ltd | Information & communication | 2025 |
| Tradeco 2001 Ltd | | 1997 |
| Tradedeals Limited | Wholesale & retail | 2024 |
| Tradedirect Logistics Limited | Wholesale & retail | 2018 |
| Trademark Finance Ltd | Financial services | 2026 |
| Trademate Technologies Ltd | Information & communication | 2026 |
| Tradstreet Hub Ltd | Wholesale & retail | 2024 |
| Trafalgar House (NW) Limited | Real estate | 2025 |
| Trafalgar House Ltd | Real estate | 2025 |
| Trafford Electrical Wholesalers Limited | Wholesale & retail | 1991 |
| Trafford Motors Ltd | Wholesale & retail | 2025 |
| Trafford Park Painting Company Limited | | 1955 |
| Transaction Entertainment Limited | Information & communication | 2025 |
| Transmission NQ Limited | Real estate | 2020 |
| Transporabus Ltd | Transport & logistics | 2011 |
| Transport Media Limited | Manufacturing | 2024 |
| Transworld Inc Ltd | Wholesale & retail | 2023 |
| Travel Avaia Ltd | Administrative & support | 2026 |
| Travel for Padel Limited | Administrative & support | 2025 |
| Travel for Sport Limited | Administrative & support | 2022 |
| Travel Vivo Ltd | Hospitality | 2022 |
| Travique.Co.Uk Limited | Administrative & support | 2025 |
| Trawden Greental Investment Ltd | Real estate | 2022 |
| Traxxwerk Ltd | Arts & recreation | 2025 |
| TRE Torri Limited | Hospitality | 2009 |
| Treadworks Ltd | Wholesale & retail | 2025 |
| Tree CUT Ltd | Other services | 2022 |
| Treehouse Coffee Shop Salford Ltd | Hospitality | 2022 |
| Treelingua Ltd | Education | 2026 |
| Treepole Ltd | Real estate | 2012 |
| Treestar Ltd | Real estate | 2018 |
| Treetop Telecom Limited | Information & communication | 2018 |
| Trenam Place 1970 Limited | Extraterritorial | 2014 |
| Trendora Tech Ltd | Wholesale & retail | 2025 |
| Trendsetters Hub Limited | Wholesale & retail | 2025 |
| Trendypick Ltd | Wholesale & retail | 2025 |
| Trent Trading Estates Limited | Other services | 2025 |
| Trentlodge Limited | Construction | 2005 |
| Tresor Car Services Ltd | Administrative & support | 2017 |
| Trevia Ltd | Wholesale & retail | 2025 |
| Trewenna Drive Ltd | Households | 2022 |
| Trexion Ltd | Wholesale & retail | 2026 |
| Trezels Ltd | Wholesale & retail | 2025 |
| Tri-Link 140 Holdings 1 LLP | | 2014 |
| Tri-Link 140 Holdings 2 LLP | | 2014 |
| Tri-Link 140 LLP | | 2014 |
| Triagenix Group Ltd | Public administration | 2026 |
| Tribe Capital Ltd | Financial services | 2021 |
| Tribute Fest Ltd | Arts & recreation | 2023 |
| Tricios Group Ltd | Information & communication | 2025 |
| Trident (Claims & Recoveries) LLP | | 2014 |
| Trident Legal Ltd | Professional & scientific | 2024 |
| Trim Time Barber Ltd | Other services | 2023 |
| Trimata Ltd | Education | 2013 |
| Trinity Diesel Services Ltd | Wholesale & retail | 2013 |
| Trinity Pietra Ltd | Real estate | 2021 |
| Trinity Securities 2 Limited | Real estate | 2026 |
| Trinity Securities Limited | Real estate | 2026 |
| Trinity Street Communications Ltd | Professional & scientific | 2023 |
| Trinity VN Limited | Wholesale & retail | 2019 |
| Trio Wind Limited | Real estate | 2025 |
| Trip Jays Top Technicians Limited | Wholesale & retail | 2025 |
| Triple C Services Limited | Information & communication | 2024 |
| Triple-D Healthcare Limited | Real estate | 2021 |
| Tripplea Enterprise Ltd | Professional & scientific | 2023 |
| Trippletr Services Ltd | Health & social care | 2024 |
| Triscom UK Ltd | Health & social care | 2019 |
| Tritex Ventures Limited | Financial services | 2025 |
| Triumph Point Ltd | Wholesale & retail | 2025 |
| Trivera Technologies Ltd | Wholesale & retail | 2024 |
| Trivida Ltd | Professional & scientific | 2025 |
| Trivoza Limited | Wholesale & retail | 2025 |
| Trois Rocs Consulting Limited | Professional & scientific | 2024 |
| Troo Hospitality Ltd | Other services | 2021 |
| Trophianica Ltd | Wholesale & retail | 2025 |
| Trophy Securities 2 Limited | Real estate | 2021 |
| Trophy Securities Limited | Real estate | 2021 |
| Troy Companies Ltd | Wholesale & retail | 2015 |
| Trucas Properties Ltd | Real estate | 2026 |
| True Peak Estates Ltd | Real estate | 2024 |
| Truecommerce (Coventry) Limited | Information & communication | 1999 |
| Truecommerce (Manchester) Limited | Information & communication | 1999 |