| Tilly's Haulage Ltd | Transport & logistics | 2019 |
| Timber Sales 4U Ltd | Construction | 2023 |
| Timber Sound Insulation Limited | Manufacturing | 2005 |
| Timberland Joinery Limited | Manufacturing | 2011 |
| Time Consulting Limited | Administrative & support | 2015 |
| Time Repairs Limited | Other services | 2006 |
| Timejaj Holdings Ltd | Financial services | 2026 |
| Timejaj Ltd | Wholesale & retail | 2025 |
| Timejaj Properties Ltd | Real estate | 2026 |
| Timeless Hues Ltd | Wholesale & retail | 2025 |
| Timotei & Go Construction Ltd | Construction | 2025 |
| Tindall Holdings Ltd | Financial services | 2022 |
| Tingshop UK Limited | Wholesale & retail | 2024 |
| Tinkerbell Children's Day Nursery Ltd | Education | 2012 |
| Tinsley Commerce Ltd | Wholesale & retail | 2026 |
| Tinted Root Limited | Manufacturing | 2025 |
| Tintho Services Ltd | Construction | 2025 |
| Tiny Bloom Childcare Ltd | Health & social care | 2026 |
| Tiny Tots Village Ltd | Arts & recreation | 2025 |
| Tiny World Trading Ltd | Wholesale & retail | 2022 |
| TIP of the Match Ltd | Professional & scientific | 2021 |
| TIP Top Tyres South Shields Limited | Extraterritorial | 2013 |
| Titan Auto Group Ltd | Wholesale & retail | 2026 |
| Titan CL (UK) Limited | Real estate | 2024 |
| Titan DS (UK) Limited | Construction | 2024 |
| Titan Global Services Ltd | Administrative & support | 2021 |
| Titan Installation Academy Ltd | Education | 2026 |
| Titan IP (UK) Limited | Real estate | 2024 |
| Titan Lighting and Electrical Supplies Ltd | Wholesale & retail | 2017 |
| Titan Personnel Ltd | Administrative & support | 2026 |
| Titan Property Holdco (UK) Limited | Financial services | 2024 |
| Titan PS (UK) Limited | Real estate | 2024 |
| Titan Roofcare Ltd | Construction | 2025 |
| Titan Security Management Ltd | Financial services | 2024 |
| Titan Trading Holdco (UK) Limited | Financial services | 2025 |
| Titan Wholesale Consumables Limited | Wholesale & retail | 2023 |
| Titaniumplus Limited | Administrative & support | 2025 |
| Tittertons Family Butchers Limited | Wholesale & retail | 2004 |
| Titus Home Improvements Ltd | Construction | 2025 |
| Tivoa Limited | Wholesale & retail | 2025 |
| TJ Computer Services (NW) Limited | Information & communication | 2014 |
| TJB Civils Limited | Construction | 2026 |
| TJK Cosmetics Ltd | Manufacturing | 2019 |
| TJK Plant Ltd | Administrative & support | 2020 |
| TJK Technical Services Ltd | Manufacturing | 2008 |
| Tjnhlapo Company.Net Limited | Health & social care | 2012 |
| TJW Online Limited | Wholesale & retail | 2020 |
| TKC Acquisitions Ltd | Financial services | 2022 |
| TKH Developments Ltd | Construction | 2021 |
| TKM Motors Ltd | Wholesale & retail | 2025 |
| TLC Investment Limited | Administrative & support | 2005 |
| TLP Group Limited | Financial services | 2024 |
| TLR Radiography Services Limited | Health & social care | 2021 |
| TLS Healthcare Ltd | Public administration | 2024 |
| TM Tyres Limited | Wholesale & retail | 2021 |
| Tmkh Property Ltd | Real estate | 2021 |
| Tmpbc Ltd | Professional & scientific | 2022 |
| TMS Properties Ltd | Real estate | 2019 |
| TN Pharma Ltd | Health & social care | 2024 |
| TNB Solutions Yorkshire Ltd | Wholesale & retail | 2023 |
| Tndhair Ltd | Other services | 2019 |
| Tneleven Limited | Administrative & support | 2010 |
| TO the Line Limited | Arts & recreation | 2011 |
| Tobacco Europe, Ltd. | Professional & scientific | 2011 |
| Todholes Investments Limited | Real estate | 2025 |
| Toga Fire Limited | Professional & scientific | 2012 |
| Toilet Cubicles Online Limited | Manufacturing | 2015 |
| Tokyos Way Ltd | Manufacturing | 2025 |
| TOM Groves Weddings Ltd | Professional & scientific | 2024 |
| TOM Limited | Real estate | 2005 |
| TOM TOM (U.K.) Limited | Construction | 1998 |
| Tom's Motors Chadderton Ltd | Wholesale & retail | 2022 |
| Tom's Motors Recovery Ltd | Transport & logistics | 2026 |
| Tomas Bocek Ltd | Information & communication | 2022 |
| Tomgavinelectrical Ltd | Construction | 2018 |
| Tommyfield Properties Limited | Real estate | 2024 |
| Tommyfield Superstore Limited | Wholesale & retail | 2013 |
| Tomtam Trading Ltd | Wholesale & retail | 2026 |
| Tone Factory Guitars Ltd | Manufacturing | 2025 |
| Tone Factory Ltd | Manufacturing | 2024 |
| Tonic Consultancy Limited | Professional & scientific | 2017 |
| Tony's Italian Ltd | Hospitality | 2014 |
| Toolequip Ltd | Wholesale & retail | 2025 |
| Tools 4 Life Ltd | Wholesale & retail | 2022 |
| Toomen Engineering Limited | Professional & scientific | 2019 |
| Tooni Limited | Wholesale & retail | 2025 |
| Toor Properties NW Ltd | Real estate | 2019 |
| Tooth and Nails Creations Ltd | Construction | 2023 |
| Top Drink Products Ltd | Wholesale & retail | 2022 |
| Top EYE Care JOB Ltd | Health & social care | 2009 |
| Top Kidz LLP | | 2021 |
| Top Nail Design Ltd | Other services | 2026 |
| Top OYA Barber Shop Ltd | Other services | 2024 |
| Top Tier Decorating Ltd | Construction | 2017 |
| Topato Ltd | Wholesale & retail | 2024 |
| Topaz Decorating Limited | Construction | 2019 |
| Topfind Ltd | Wholesale & retail | 2024 |
| Topfruits (Southend) Limited | Wholesale & retail | 2002 |
| Toplook Hair Limited | Health & social care | 2024 |
| Torbire Limited | Wholesale & retail | 2021 |