| T&T Fitness Consult Ltd | Administrative & support | 2016 |
| T-Bot Care Dynamics Limited | Health & social care | 2014 |
| T-Route Express Ltd | Transport & logistics | 2025 |
| T.G. Gregory & Associates Limited | Construction | 1999 |
| T.O.R. Electrical Contractors Limited | Construction | 2013 |
| T.R.I. Contracting Services Limited | Construction | 1989 |
| T.Sukackas Ltd | Transport & logistics | 2022 |
| T.W Auto Repair Ltd | Wholesale & retail | 2025 |
| T2 M Limited | Construction | 2025 |
| T2 Sensing Ltd | Professional & scientific | 2023 |
| T2 Vision Services Limited | Households | 2024 |
| Taceit Limited | Wholesale & retail | 2016 |
| Taci Ltd | Transport & logistics | 2014 |
| Tack Electrical Ltd | Construction | 2022 |
| Tadi Driving Ltd | Transport & logistics | 2018 |
| Tahmina & Co Solicitors Ltd | Professional & scientific | 2018 |
| Taitan Cleaning Service Ltd | Administrative & support | 2026 |
| Take 4 Care Ltd | Health & social care | 2014 |
| Take 4 Personnel Ltd | Administrative & support | 2004 |
| Take Direct Limited | Other services | 2013 |
| Talbott Estates Limited | Real estate | 2026 |
| Taleem Foundation | Education | 2020 |
| Talk Electricians UK Ltd | Construction | 2024 |
| Tameliash Pride Limited | Health & social care | 2018 |
| TAN N Glow Limited | Other services | 2022 |
| Tanaka Consultants Limited | Construction | 2025 |
| Tanelosew Ltd | Wholesale & retail | 2025 |
| Tanelosewing Ltd | Wholesale & retail | 2025 |
| Tanevit Ltd | Information & communication | 2017 |
| Taniimo Limited | Real estate | 2023 |
| Taninkawin Ltd | Health & social care | 2024 |
| Tanners Technical Services Ltd | Construction | 2019 |
| Tanzees Ltd | Hospitality | 2022 |
| Tapthat Ltd | Information & communication | 2015 |
| Tapu Streetfood Ltd | Wholesale & retail | 2025 |
| TARI95 Ltd | Administrative & support | 2019 |
| Tarmat Consulting Limited | Professional & scientific | 2024 |
| Tartar Ltd | Transport & logistics | 2016 |
| Task Built Limited | Construction | 2022 |
| Taste GBP Ltd | Hospitality | 2026 |
| Taste of Nigeria (Essex) Ltd | Hospitality | 2020 |
| Tatar UME Ltd | Transport & logistics | 2025 |
| Tate Sharman & Co Limited | Construction | 2023 |
| TATTO0EXPRESS Ltd | Arts & recreation | 2025 |
| Tax Accurate Consultants Limited | Professional & scientific | 2021 |
| Taylor Bros. (Grays) Limited | Construction | 2020 |
| TBI Research Ltd | Professional & scientific | 2025 |
| TBM Consultancy Ltd | Professional & scientific | 2014 |
| TBR Holdings Ltd | Real estate | 2019 |
| TCL Trading Limited | Arts & recreation | 2003 |
| TCS Build Ltd | Construction | 2022 |
| TD Afrique Films Limited | Administrative & support | 2021 |
| TDS Assets Ltd | Real estate | 2022 |
| TDS Plumbing and Heating Ltd | Construction | 2018 |
| TDS-84 Ltd | Construction | 2021 |
| Tdsk Construction Services Ltd | Construction | 2026 |
| Teal & Turquoise Limited | Arts & recreation | 2021 |
| Teamfitness League Ltd | Arts & recreation | 2026 |
| Teamfitness Limited | Arts & recreation | 2011 |
| Teamtex Limited | Information & communication | 2008 |
| Tec-Kab Ltd | Information & communication | 2014 |
| Tec-Nova Solutions Ltd | Information & communication | 2024 |
| Tech Equity Cloud Services Ltd | Information & communication | 2021 |
| Tech Equity Property Ltd | Real estate | 2024 |
| Techcompass Ltd | Education | 2026 |
| Techdw Limited | Information & communication | 2015 |
| Techhouse Accessories Limited | Wholesale & retail | 2013 |
| Techlink Accessories Limited | Wholesale & retail | 2025 |
| Technet College London Ltd | Education | 2014 |
| Technet Easy Services Ltd | Information & communication | 2014 |
| Techonet Civils Services Limited | Professional & scientific | 2024 |
| Techtrend Traders Ltd | Wholesale & retail | 2024 |
| Techvertu Limited | Information & communication | 2012 |
| Tedex Direct Ltd | Transport & logistics | 2015 |
| Teerem Limited | Wholesale & retail | 2018 |
| Tee’S Bridal Ltd | Wholesale & retail | 2025 |
| Tektara Limited | Administrative & support | 2025 |
| Telemetric Solutions Limited | Professional & scientific | 2026 |
| Temishop.Com Ltd | Wholesale & retail | 2026 |
| Templar Scaffolding Ltd | Extraterritorial | 2025 |
| Temple Farm Cafe Ltd | Hospitality | 2013 |
| Temps Recruitment Hub Ltd | Administrative & support | 2024 |
| Tenbit Group Limited | Information & communication | 2024 |
| Tenjiku Ltd | Wholesale & retail | 2023 |
| Tenzey Limited | Health & social care | 2023 |
| Teodora Trans Ltd | Transport & logistics | 2020 |
| Terminus Pest Control Ltd | Professional & scientific | 2021 |
| Terra Energi Ltd | Construction | 2024 |
| Terra Vita Limited | Transport & logistics | 2014 |
| Terraclad Facades Ltd | Construction | 2020 |
| Terraclad Ltd | Construction | 2017 |
| Tervon Ltd | Construction | 2026 |
| Tessmira Ltd | Wholesale & retail | 2025 |
| Tetra Music Limited | Wholesale & retail | 2025 |
| Texcetera Ltd | Manufacturing | 2016 |
| Texman Ventures Ltd | Administrative & support | 2026 |
| TGP Global Ltd | Professional & scientific | 2025 |
| TGR Group Limited | Households | 2019 |
| Tgrproperty Ltd | Households | 2020 |
| Thai by Thai Food Ltd | Hospitality | 2025 |