| TRC Consultancy Limited | Administrative & support | 2022 |
| TRC Investments (NW) Limited | Real estate | 2021 |
| Treadfast Limited | Wholesale & retail | 2025 |
| Treaps Limited | Professional & scientific | 2026 |
| Treasure Your Wellbeing CIC | Administrative & support | 2019 |
| Treasured Books Ltd | Wholesale & retail | 2014 |
| Treble 5 Plant Services Ltd | Administrative & support | 2017 |
| Trecos Consulting Limited | Professional & scientific | 2020 |
| Tree Lined Management Limited | Other services | 2011 |
| Treehouse Innovation Ltd | Other services | 2010 |
| Treetops Parties Limited | Arts & recreation | 2024 |
| Treetops Play and Party Cafe Limited | Arts & recreation | 2014 |
| Treferwydd Management Company Limited | Households | 2007 |
| Trek N Train Limited | Other services | 2020 |
| Tremorna Inns Limited | Hospitality | 1992 |
| Trend Bar Ltd | Hospitality | 2023 |
| Trendgifty Ltd | Wholesale & retail | 2025 |
| Tresham Belmont Ltd | Financial services | 2026 |
| Trevalyn Wood Limited | Agriculture & fishing | 2015 |
| Trevion Ltd | Administrative & support | 2019 |
| Trevopedia Tours & Travel Ltd | Administrative & support | 2022 |
| Trevopedia Travels Limited | Administrative & support | 2024 |
| Trevor 139-5834 Limited | Health & social care | 2024 |
| Trevor Allen Consulting Limited | Administrative & support | 2007 |
| Trex PI Ltd | Information & communication | 2018 |
| Trexa Mart Limited | Wholesale & retail | 2025 |
| TRG Estates Ltd | Real estate | 2024 |
| TRG Prop Consulting Ltd | Professional & scientific | 2025 |
| Triactivate Ltd | Administrative & support | 2021 |
| Tribe Emporium Ltd | Other services | 2017 |
| Tribe Inspire and Empower (TIE) to Wellness CIC | Health & social care | 2024 |
| Tribeca Events Ltd | Hospitality | 2025 |
| Tribica Limited | Construction | 2025 |
| Trident Hotels (South Lakes) Investments LLP | | 2016 |
| Trident Renewable Services Ltd | Administrative & support | 2026 |
| Trident Spares Ltd | Wholesale & retail | 2017 |
| Trigage Limited | Professional & scientific | 2022 |
| Triishool Industries Ltd | Wholesale & retail | 2025 |
| Triline Plastering Contractors Limited | Construction | 2001 |
| Triloc Limited | Extraterritorial | 1997 |
| Trinit-E Tech Ltd | Information & communication | 2025 |
| Trinity Associates Ltd | Information & communication | 2019 |
| Trinity ESG Consulting Ltd | Information & communication | 2023 |
| Trinity Open Seas Ltd | Wholesale & retail | 2024 |
| Trinity Organics (Holdings) Limited | Real estate | 2023 |
| Trinity Organics Limited | Professional & scientific | 2016 |
| Trinity Paintworks Ltd | Construction | 2024 |
| Trinity Project & Maintenance Ltd | Administrative & support | 2016 |
| Trinje Ltd | Real estate | 2022 |
| Trip OR DYE Ltd | Manufacturing | 2025 |
| Triple 777 Engineering Ltd | Administrative & support | 2024 |
| Triple Eleven Design Limited | Administrative & support | 2014 |
| Triple H Insight Solutions Limited | Construction | 2012 |
| Triumph Procurement Ltd | Administrative & support | 2026 |
| Triumph Studio Ltd | Manufacturing | 2024 |
| TRL Enterprises Ltd | Real estate | 2022 |
| TRL Studios Ltd | Information & communication | 2018 |
| TRO Solutions Ltd | Administrative & support | 2007 |
| Trochos Consulting Limited | Professional & scientific | 2016 |
| Trotters Dependant Traders Ltd | Hospitality | 2025 |
| Trough Laithe Farm Ltd | Construction | 2021 |
| Trough Laithe Gardens Maintenance Limited | Real estate | 2024 |
| Trowbridge Energy Limited | Construction | 2025 |
| Trubuild Solutions Ltd | Construction | 2025 |
| True North Creative Limited | Administrative & support | 2011 |
| True North Excellence Ltd | Professional & scientific | 2013 |
| True North Property Limited | Construction | 2024 |
| True Peptide LAB Ltd | Professional & scientific | 2026 |
| True Rally Limited | Extraterritorial | 2017 |
| Trueline UK Services Ltd | Construction | 2020 |
| Trueman Engineering Limited | Administrative & support | 2016 |
| Truman & Co (North West) Limited | Other services | 2014 |
| Trusox Europe Ltd | Manufacturing | 2013 |
| Trust Alliance Group Limited | Professional & scientific | 2002 |
| Trust Fleet Services Ltd | Administrative & support | 2016 |
| Trust Management Services Ltd | Professional & scientific | 2016 |
| Trustdocs Legal Services Ltd | Administrative & support | 2021 |
| Trustdocs Ltd | Administrative & support | 2016 |
| Trusted Solutions Group Ltd | Information & communication | 2018 |
| Trustify Estate Planning Limited | Professional & scientific | 2024 |
| TRY Catch Limited | Information & communication | 2012 |
| Trygen International Ltd | Professional & scientific | 2025 |
| Tryit Impact CIC | Education | 2026 |
| TS Construction Group Ltd | Construction | 2019 |
| TS Inspections Ltd | Administrative & support | 2025 |
| TS Mechanical & Electrical Limited | Administrative & support | 2024 |
| TS Tomtrans Ltd | Transport & logistics | 2020 |
| Tsang's Trading Company Limited | Health & social care | 2023 |
| TSB Building Solutions Ltd | Construction | 2019 |
| TSC Structural Design Ltd | Construction | 2016 |
| TSF 2003 Invest Limited | Professional & scientific | 2017 |
| TSF Engineering Limited | Administrative & support | 2012 |
| Tshideout Ltd | Wholesale & retail | 2026 |
| TSI Logistics Ltd | Transport & logistics | 2023 |
| TSL Investments Limited | Real estate | 2020 |
| Tsom Mentoring Ltd | Education | 2019 |
| Tsuga Limited | Professional & scientific | 2002 |
| TT Concierge Ltd | Administrative & support | 2025 |
| TT IO Limited | Information & communication | 2019 |
| TT Management (North West) Limited | Professional & scientific | 2019 |