| Tcft Financial Ltd | Financial services | 2022 |
| TCO Properties Ltd | Real estate | 2021 |
| TCR Finance Limited | Extraterritorial | 2017 |
| TCR Insurance Agency Limited | Financial services | 2000 |
| TCR New Limited | Extraterritorial | 2017 |
| TCS Drains & Property Maintenance Services Limited | Administrative & support | 2026 |
| TDI Tuning Ltd | Manufacturing | 2012 |
| TDS Development Services Limited | Real estate | 2023 |
| TE ARA Limited | Wholesale & retail | 2001 |
| Tea Consulting Limited | Real estate | 2018 |
| Tea on the Green (Danbury) Limited | Hospitality | 2015 |
| Tea Tea Express Ltd | Wholesale & retail | 2013 |
| Team Bellenie Livery and Rehab Limited | Agriculture & fishing | 2024 |
| Team Blue 24 Limited | Health & social care | 2026 |
| Team Sixty SIX Limited | Wholesale & retail | 2023 |
| Teampape Ltd | Education | 2025 |
| Tears of Paris Limited | Wholesale & retail | 2021 |
| Teblet Holdings Limited | Wholesale & retail | 2021 |
| TEC Estates Limited | Administrative & support | 2001 |
| TEC Logistics Ltd | Transport & logistics | 2020 |
| Tech Discovery Ltd | Information & communication | 2010 |
| Tech Kingdom Limited | Wholesale & retail | 2018 |
| Tech Mentor Limited | Education | 2023 |
| Tech Viral Ltd | Wholesale & retail | 2025 |
| TECH4JETS Ltd | Professional & scientific | 2012 |
| Techbiz Consultants Ltd | Information & communication | 2012 |
| Technical Writing Consultants Limited | Professional & scientific | 2020 |
| Technobabble Solutions Ltd | Information & communication | 2012 |
| Technocraft Solutions Ltd | Information & communication | 2017 |
| Technofoil Limited | Manufacturing | 1999 |
| Technology Together Limited | Extraterritorial | 2014 |
| Techshift Limited | Information & communication | 2018 |
| Techsmes Limited | Information & communication | 2018 |
| Techsoccer Hubs Ltd | Administrative & support | 2025 |
| Techsoccer Ltd | Education | 2022 |
| Techson Estates Ltd | Real estate | 2025 |
| Tedium Properties Limited | Administrative & support | 2010 |
| Teds of Mayland Limited | Hospitality | 2017 |
| TEE Auto Electrical Services Ltd. | Professional & scientific | 2021 |
| Tegre Limited | Real estate | 2022 |
| Tehillah Logistics Services Ltd | Wholesale & retail | 2025 |
| Tehy Care Group Ltd. | Administrative & support | 2016 |
| Tehy Home Care Limited | Health & social care | 2018 |
| TEK City 1 Ltd | Information & communication | 2018 |
| TEK Consulting Ltd | Information & communication | 2022 |
| TEK Kingdom Limited | Wholesale & retail | 2013 |
| Tekminders Global Limited | Wholesale & retail | 2020 |
| Tekshan Enterprises PVT Ltd | Other services | 2021 |
| Tekshan Properties Ltd | Real estate | 2024 |
| Tekshan Technologies Ltd | Information & communication | 2019 |
| Tekton Property Services Limited | Administrative & support | 2011 |
| Telecom AI Ltd | Information & communication | 2025 |
| Telecoms Asia LLP | | 2023 |
| Teledyne C.M.L. Group Limited | Manufacturing | 1981 |
| Teledyne Labtech Limited | Manufacturing | 1983 |
| Teledyne Limited | Manufacturing | 1999 |
| Teledyne Valeport (Holdings) Limited | Financial services | 2012 |
| Teledyne Valeport Developments Limited | Administrative & support | 2016 |
| Teledyne Valeport Holdings 2019 Limited | Financial services | 2019 |
| Teledyne Valeport Limited | Manufacturing | 1985 |
| Teledyne Valeport Mainland Developments Limited | Administrative & support | 2016 |
| Teledyne Valeport Water Limited | Manufacturing | 2016 |
| Teletrack Live Limited | Information & communication | 2001 |
| Temj Holdings Ltd | Wholesale & retail | 2025 |
| Template Ltd | Information & communication | 2019 |
| Temple Court (Chelmsford) Management Limited | Households | 1998 |
| Templeman Opticians Limited | Health & social care | 2002 |
| Templeman Ventures Limited | Wholesale & retail | 2001 |
| Templowe Roof Repairs Ltd | Construction | 2026 |
| Temporary Foundation Hire Ltd | Manufacturing | 2010 |
| Tendo Associates Limited | Arts & recreation | 2023 |
| Tendring Small Animal Shelter | Other services | 2025 |
| Tenofad Limited | Professional & scientific | 2008 |
| Tenphi Limited | Information & communication | 2026 |
| Tensorprop Limited | Households | 2024 |
| Tepador Properties Limited | Households | 2017 |
| Terawatt Infrastructure UK Limited | Financial services | 2026 |
| Terling Swimming Club Limited | Arts & recreation | 2000 |
| Termill Limited | Hospitality | 2017 |
| Terra Cotta (Chelsea) Limited | Arts & recreation | 2007 |
| Terra-Vac Limited | Manufacturing | 2009 |
| Terraform Property Investments Ltd | Real estate | 2024 |
| Terraform Services Ltd | Construction | 2021 |
| Terraharvest Group Ltd | Wholesale & retail | 2026 |
| Terraluz Homes Ltd | Construction | 2025 |
| Terrington Homes Ltd | Real estate | 2026 |
| Terry Gibbons Ltd | Financial services | 2025 |
| Terry Prosser Accounting Solutions Limited | Professional & scientific | 2002 |
| Tervers Transport Limited | Transport & logistics | 2025 |
| TES Habile Homes Limited | Real estate | 2025 |
| Teshta Ltd | Health & social care | 2019 |
| Tesla Retail Limited | Wholesale & retail | 2015 |
| Test Safe Electrical Ltd | Construction | 2020 |
| Textile Express Ltd | Wholesale & retail | 2024 |
| Textra Heavy Ltd | Transport & logistics | 2016 |
| Teyssier Limited | Wholesale & retail | 2022 |
| Tezplumbers Ltd | Water & waste | 2025 |
| TF Marketing Limited | Professional & scientific | 2025 |
| TFG Consulting Ltd | Professional & scientific | 2023 |
| TG Parcel Solutions Ltd | Transport & logistics | 2020 |