| Thomas Rigg Wealth Management Limited | Financial services | 2018 |
| Thompson Bros Entertainment Limited | Hospitality | 2016 |
| Thompson Gerrard Limited | Financial services | 2002 |
| Thompsons Installations Limited | Construction | 2021 |
| Thorne Hedgehog Rescue CIC | Other services | 2025 |
| Thornton Vale Ltd | Administrative & support | 2018 |
| Thoroughly Wood Furniture Ltd | Professional & scientific | 2020 |
| Thoughttree LAB Ltd | Professional & scientific | 2024 |
| Threads Kent Limited | Arts & recreation | 2015 |
| Three Birches Properties Ltd | Real estate | 2018 |
| Three Daughters Trading Limited | Professional & scientific | 2000 |
| Three Degrees Therapy Ltd | Other services | 2018 |
| Three KZN Zulus Ltd | Real estate | 2020 |
| Three Pots Ltd | Hospitality | 2025 |
| Three R'S Limited | Administrative & support | 2001 |
| Three Strand Productions Ltd | Information & communication | 2021 |
| Threesixty Pro Ltd | Administrative & support | 2026 |
| Threnium Group UK Limited | Financial services | 2017 |
| Thrivewell Supplements Limited | Wholesale & retail | 2026 |
| Through Their Eyes Ltd | Information & communication | 2024 |
| Thumbnail Limited | Other services | 2009 |
| Thurlow Park Road Limited | Real estate | 2016 |
| Thyme Cleaning (London) Limited | Professional & scientific | 2021 |
| Tickcons Limited | Professional & scientific | 2024 |
| Tidework Services Limited | Construction | 1977 |
| Tiger International Education Ltd | Education | 2019 |
| Tiger to Go Ltd | Administrative & support | 2018 |
| Tikbuy Ltd | Wholesale & retail | 2025 |
| Tikitech Ltd | Information & communication | 2023 |
| TIKM8 Ltd | Information & communication | 2026 |
| Tilc Property Consultant Ltd | Real estate | 2017 |
| Timbertech Studio Limited | Manufacturing | 2026 |
| Time Asset Commodity Tradings Limited | Information & communication | 2011 |
| Time Training Limited | Education | 2013 |
| Timeless Teacup Rentals Ltd | Administrative & support | 2026 |
| TIN Hats Broadcast Sound Limited | Information & communication | 2015 |
| Tiny Crown Limited | Health & social care | 2023 |
| Tinydog Creative Limited | Information & communication | 2013 |
| Tipi Consulting Ltd | Information & communication | 2016 |
| Tipmix Services Ltd | Water & waste | 2016 |
| Tisoll Trading Ltd | Wholesale & retail | 2024 |
| Titan General Services Limited | Real estate | 2018 |
| Titan S3 Ltd | Information & communication | 2024 |
| Titansec Ltd | Information & communication | 2020 |
| Tiuri Interiors Ltd | Construction | 2020 |
| TIV Group Ltd | Transport & logistics | 2024 |
| TIV Logistics Ltd | Transport & logistics | 2023 |
| TIV Transport Limited | Transport & logistics | 2015 |
| TJ Homes Modern Living Design & Build Limited | Administrative & support | 2010 |
| TJ Mason Properties Ltd | Real estate | 2020 |
| Tj/Mp Transport Ltd | Transport & logistics | 2020 |
| TJF Electrical Ltd | Construction | 2019 |
| TJK Properties Limited | Real estate | 2016 |
| TJL Building Services Limited | Construction | 2011 |
| Tjmc Services Ltd | Real estate | 2023 |
| TKC Waste Solutions Ltd | Water & waste | 2017 |
| TKO Academy Pro-Shop Ltd | Wholesale & retail | 2024 |
| TKO Kickboxing Academy Limited | Arts & recreation | 2017 |
| TLB Limited | Professional & scientific | 2001 |
| TLG Talent Limited | Professional & scientific | 2023 |
| TM Business Support Ltd | Professional & scientific | 2014 |
| TMB Asset & Value Ltd | Real estate | 2020 |
| TMB Property Investments Limited | Real estate | 2024 |
| TMK Upholstery Ltd | Manufacturing | 2017 |
| TMR Holland Holdings Ltd | Real estate | 2025 |
| TMS Cleaning Ltd | Administrative & support | 2016 |
| TMS FM Group Ltd | Administrative & support | 2021 |
| TMS Maintenance Ltd | Construction | 2023 |
| TMS Monitoring Ltd | Administrative & support | 2020 |
| TMS Protection Ltd | Administrative & support | 2014 |
| Tmtt Investment Limited | Real estate | 2020 |
| TN Kent Ltd | Hospitality | 2023 |
| TN27 Lettings Limited | Extraterritorial | 2007 |
| TND Car Sales Ltd | Wholesale & retail | 2022 |
| TNR Property Ltd | Hospitality | 2019 |
| TNT Technical Holdings Ltd | Professional & scientific | 2017 |
| To-Heal Ltd | Health & social care | 2025 |
| Tobams Limited | Hospitality | 2025 |
| Tobias Hardy Consultancy Ltd | Construction | 2025 |
| Tobstims Care Ltd | Health & social care | 2018 |
| Toftrees Consulting Ltd | Professional & scientific | 2016 |
| Togo Transport Limited | Wholesale & retail | 2016 |
| Toks Services Ltd | Health & social care | 2015 |
| Tokstony Services Limited | Health & social care | 2017 |
| Toliapis Limited | Construction | 2004 |
| Toltem Web Solutions Limited | Information & communication | 2017 |
| TOM Emson Racing Limited | Arts & recreation | 2024 |
| TOM Farms Ltd | Construction | 2008 |
| Tom's Garage (S.E) Ltd | Wholesale & retail | 2025 |
| Tomaentclinic Limited | Health & social care | 2026 |
| Tomas Negusse Ltd | Construction | 2017 |
| Tomdorted Limited | Administrative & support | 2018 |
| Tomsett Holdings Limited | Financial services | 2018 |
| Tonbridge Construction Limited | Construction | 2019 |
| Tongdean Limited | Households | 1993 |
| Tonkabeeza Limited | Wholesale & retail | 2011 |
| Tony Burton Services Limited | Construction | 2025 |
| Tony Group Limited | Wholesale & retail | 2020 |
| Tony Harden Solicitors Ltd | Professional & scientific | 2016 |
| Tony Healy Golf Services Ltd | Arts & recreation | 2018 |