| Tiny Tim's Children's Centre | Administrative & support | 2002 |
| Tiny Tots Nursery (Nuneaton) Ltd | Education | 2013 |
| Tiptoe Beauty and Aesthetics Ltd | Other services | 2025 |
| Tireals Limited | Administrative & support | 2025 |
| Tjmee Limited | Administrative & support | 2023 |
| Tjsr Services Ltd | Construction | 2024 |
| TK Recovery Ltd | Wholesale & retail | 2026 |
| TKX Plumbing and Heating Ltd | Construction | 2025 |
| TLB Distributions Ltd | Wholesale & retail | 2026 |
| TLB Naturals Ltd | Wholesale & retail | 2022 |
| TMD Supply Chain Consultancy Limited | Administrative & support | 2007 |
| TMK (Leicester) Limited | Hospitality | 2023 |
| TNG 25 Limited | Hospitality | 2019 |
| Toke Enterprises Limited | Construction | 2024 |
| Token Properties Limited | Real estate | 2009 |
| Tokoni Foods Limited | Wholesale & retail | 2025 |
| Tolsar Limited | Wholesale & retail | 2025 |
| Tomg Distribution Ltd | Wholesale & retail | 2025 |
| Tommy James Photography Ltd | Other services | 2011 |
| Tommy James Properties Ltd | Real estate | 2024 |
| Tongfu Ltd | Manufacturing | 2025 |
| Tonisavio Hair Studio Ltd | Wholesale & retail | 2019 |
| Tony Scott (Realisations) Limited | | 1960 |
| Tooltech Precision Tooling Limited | Manufacturing | 2003 |
| Toon Media Limited | Information & communication | 2009 |
| Top Drycleaning Nuneton Ltd | Other services | 2025 |
| Top Express Delivery Limited | Transport & logistics | 2025 |
| Top Strike Sports Limited | Wholesale & retail | 2007 |
| Top Tailoring Nuneton Ltd | Other services | 2023 |
| Top Tier Access LMM I Commv Ltd | Manufacturing | 2025 |
| Top Trading (Wholesale) Limited | Wholesale & retail | 2010 |
| Top UP Best Solutions Ltd | Professional & scientific | 2019 |
| Total Contract Cleaning Limited | Administrative & support | 2025 |
| Total Pressure Solutions Limited | Wholesale & retail | 2021 |
| Total Solutions TSL Limited | Construction | 2014 |
| Touch Base Automotive Limited | Wholesale & retail | 2024 |
| Touchbytomi Ltd | Other services | 2023 |
| Tower Vending Services Ltd | Wholesale & retail | 2025 |
| Tower Wellness Limited | Arts & recreation | 2026 |
| Town & Country (Timber Preservation) Company Limited | Construction | 2003 |
| Town 2 Town Logistics Limited | Transport & logistics | 2025 |
| Town and Country Damp Specialists Ltd | Construction | 2017 |
| Toys on the Table Ltd | Other services | 2007 |
| Tpalash Limited | Health & social care | 2014 |
| Tracers Emergency Stewards Ltd | Administrative & support | 2025 |
| Tradecog Ltd | Wholesale & retail | 2022 |
| Tradex Inter Ltd | Transport & logistics | 2015 |
| Trail Surge Ltd | Wholesale & retail | 2025 |
| Train Learn Go DH Limited | Arts & recreation | 2016 |
| Training and Therapies Ltd | Education | 2026 |
| Transform 3D Ltd | Information & communication | 2024 |
| Translor Ltd | Transport & logistics | 2012 |
| Transport Darius Ltd | Transport & logistics | 2021 |
| Transporter 1 Ltd | Transport & logistics | 2017 |
| Treasures Care Limited | Health & social care | 2018 |
| Trebble Consulting Limited | Transport & logistics | 2025 |
| Trebleflex Limited | Manufacturing | 2026 |
| Trehan Ltd | Wholesale & retail | 2019 |
| Trendgrey Construction Limited | Construction | 1985 |
| Trendgrey Limited | Construction | 2007 |
| Trevor Beasley & Co. Limited | Professional & scientific | 2002 |
| Trident Continental Transport Limited | Information & communication | 1982 |
| Trigger & SON Limited | Real estate | 2018 |
| Trinitas Ltd | Professional & scientific | 2021 |
| Trinity Xtras Limited | Wholesale & retail | 2001 |
| Tristen MAY Limited | Manufacturing | 1998 |
| TRK Limited | Professional & scientific | 2024 |
| Tronic Extreme Limited | Wholesale & retail | 2025 |
| Truck Smart Limited | Administrative & support | 2012 |
| Trudomes USA Ltd | Wholesale & retail | 2021 |
| True Light Creations Ltd | Wholesale & retail | 2025 |
| True North Equity Group Limited | Financial services | 2025 |
| Truly Sumptuous Sweetz and Treatz Ltd | Manufacturing | 2013 |
| TSB Logistics Ltd | Transport & logistics | 2022 |
| TT Solutions Ltd | Information & communication | 2013 |
| Tudor Build Ltd | Construction | 2010 |
| Tudor Court Management (Godmanchester) Company Limited | Households | 1997 |
| Tudorbuild Properties Ltd | Real estate | 2023 |
| Tuftex Properties Limited | Real estate | 1998 |
| Tulip Communications Ltd | Professional & scientific | 2011 |
| Tump Services Limited | Professional & scientific | 2015 |
| Tuns Raul Ltd | Transport & logistics | 2019 |
| Turcan Property Group Ltd | Real estate | 2026 |
| Turkish Market Ltd | Wholesale & retail | 2023 |
| Turn Land & Property Ltd | Real estate | 2020 |
| Tuttle Hill Investment Limited | Real estate | 2022 |
| TVW Properties Ltd | Real estate | 2021 |
| Twenty 10 Digital Limited | Manufacturing | 2009 |
| Twenty Two Interiors Limited | Manufacturing | 2021 |
| TWENTY47PLUMBERS Ltd | Construction | 2025 |
| Twilight Housing & Support CIC | Real estate | 2026 |
| Twyford Court (Freehold) Limited | Households | 2016 |
| TY & Co Properties Limited | Real estate | 2024 |
| TY Belford Goalkeeping Limited | Arts & recreation | 2022 |
| Ty's Bodyshop Limited | Wholesale & retail | 2015 |
| Tymewells Limited | Real estate | 2017 |
| Tyspen Holdings Ltd | Financial services | 2024 |
| Tyspen Limited | Financial services | 2016 |
| Tyya&Swan Ltd | Administrative & support | 2025 |
| Uber Design Limited | Wholesale & retail | 2005 |