| Top Tier Co Holdings Ltd | Financial services | 2025 |
| Top Tier Scaffolding Ltd | Construction | 2020 |
| Top Transport Ltd | Construction | 2021 |
| Top Tree Leicester Limited | Arts & recreation | 2025 |
| Topaz Twentyone Limited | Information & communication | 2025 |
| Topcade Limited | Administrative & support | 2020 |
| Topco Investments Limited | Real estate | 2026 |
| Topcu Engineering Ltd | Professional & scientific | 2023 |
| Topero Ltd | Wholesale & retail | 2022 |
| Topix Solutions Limited | Other services | 2005 |
| Topkapi Productions Limited | Wholesale & retail | 2017 |
| Topolo Pizza Ltd | Hospitality | 2021 |
| Topp Shop 3 Ltd | Wholesale & retail | 2025 |
| Topps Private Hire Limited | Transport & logistics | 2011 |
| Topps Taxis Limited | Transport & logistics | 2011 |
| Toprange Logistics Ltd | Transport & logistics | 2016 |
| Toprange Properties Relocation Limited | Real estate | 2025 |
| Topside Sound Limited | Information & communication | 2023 |
| Toptable Ltd | Real estate | 2015 |
| Topwear Limited | Manufacturing | 2025 |
| Torch Legal Limited | Financial services | 2018 |
| Torchlight Advisers Ltd | Professional & scientific | 2016 |
| Torchwood Fishing Tackle and Bait Ltd | Wholesale & retail | 2021 |
| Tornos Technologies UK Limited | Extraterritorial | 1979 |
| Toro's Steakhouse Limited | Extraterritorial | 2011 |
| Torpedo Logistics Ltd | Transport & logistics | 2021 |
| Torrance Associates Ltd | Financial services | 2015 |
| Torres UK Medical Advisors Ltd | Information & communication | 2022 |
| Torridge Building Company Limited | | 1964 |
| Torrington Communications Limited | Extraterritorial | 2002 |
| Torzon Crest Limited | Hospitality | 2024 |
| Tosa INU Ltd | Transport & logistics | 2019 |
| Total Admin Support Ltd | Administrative & support | 2024 |
| Total Audit and Management of Safety Ltd | Public administration | 2022 |
| Total Campers Leisure Ltd | Wholesale & retail | 2024 |
| Total Combat Martial Arts & Fitness Ltd | Arts & recreation | 2016 |
| Total Development Sport & Fitness Ltd | Arts & recreation | 2024 |
| Total Eco & Electrical Ltd | Construction | 2025 |
| Total Edge Ltd | Information & communication | 2012 |
| Total Environmental and Mechanical Services Ltd | Construction | 2018 |
| Total Freight Forwarding Ltd | Transport & logistics | 2021 |
| Total Gates & Security Solutions Limited | Construction | 2025 |
| Total Graphics Solutions SD Ltd | Administrative & support | 2014 |
| Total IT Global UK Limited | Information & communication | 2017 |
| Total Motion Limited | Administrative & support | 2003 |
| Total Performance Physio Clinics Ltd | Health & social care | 2020 |
| Total Pet Foods (Leic) Ltd | Manufacturing | 2022 |
| Total Power Electrical Services Limited | Construction | 2014 |
| Total Property Dynamics Limited | Real estate | 2017 |
| Total Property Solutions Limited | Professional & scientific | 2008 |
| Total Services Maintenance Ltd | Professional & scientific | 2018 |
| Total Tech Development Ltd | Information & communication | 2025 |
| Total Torque Ltd | Wholesale & retail | 2017 |
| Total Tree Services Limited | Agriculture & fishing | 2010 |
| Total Work Solutions Limited | Professional & scientific | 2017 |
| Totalops Consulting Ltd | Information & communication | 2025 |
| Totes&Ribbons Ltd | Wholesale & retail | 2026 |
| Tottenhill Profitable Ltd | Transport & logistics | 2015 |
| Totus Payroll Consultancy Limited | Information & communication | 2016 |
| Toucan Traders Ltd | Wholesale & retail | 2025 |
| Touch of Funk Ltd | Information & communication | 2026 |
| Touchpoint Systems Limited | Information & communication | 1999 |
| Touchwood Carpets & Flooring (Leicester) Ltd | Construction | 2026 |
| Toupie Holdings Limited | Real estate | 2017 |
| Touregs Private Travel Ltd | Administrative & support | 2025 |
| Tournay Design Limited | Professional & scientific | 2023 |
| Toutdoors Ltd | Wholesale & retail | 2023 |
| Tove Leicester Limited | Hospitality | 2026 |
| Towbee UK Ltd | Transport & logistics | 2026 |
| Tower Commercial Catering Limited | Other services | 2006 |
| Tower Eleven Ltd | Wholesale & retail | 2022 |
| Tower Grill Ltd | Wholesale & retail | 2016 |
| Tower Tool Company Limited | Manufacturing | 1980 |
| Towers Management (Leicester) Limited | Real estate | 2008 |
| Townend Projects Ltd | Professional & scientific | 2021 |
| Towngate Deluxe Ltd | Transport & logistics | 2014 |
| Townlands C of E Primary Academy | Education | 2014 |
| Townosteo Limited | Health & social care | 2015 |
| Townsends Group Ltd | Manufacturing | 2019 |
| Township Productions Limited | Manufacturing | 2022 |
| Toxic LUX Ltd | Wholesale & retail | 2019 |
| Toxicwaster Ltd | Information & communication | 2016 |
| Toyeenstyle & Textile Limited | Manufacturing | 2025 |
| TOYS4KIDS Ltd | Wholesale & retail | 2024 |
| TPC UK25 Ltd | Wholesale & retail | 2025 |
| Tpdmakari Logistics Ltd | Transport & logistics | 2026 |
| TPE Group Ltd | Construction | 2022 |
| TPH Contractors (Midlands) Limited | Construction | 2023 |
| TPI Aerospace Ltd | Manufacturing | 2017 |
| TPI Electrical Limited | Construction | 2021 |
| TPI Properties Ltd | Real estate | 2026 |
| TPI Systems Limited | Administrative & support | 2018 |
| TPK Limited | Transport & logistics | 2011 |
| TPS Hire Limited | Administrative & support | 2012 |
| TPS Project Management LLP | | 2012 |
| Tpsa Labs Ltd | Professional & scientific | 2021 |
| TQ Studio Ltd | Professional & scientific | 2022 |
| TQC Consulting Ltd | Information & communication | 2014 |
| TR 82 Ltd | Construction | 2025 |
| TR Business Holdings Limited | Professional & scientific | 2017 |