| Thomas Norman (UK) Limited | Extraterritorial | 2006 |
| Thomasson HV Limited | Construction | 2026 |
| Thomasson Ltd | Construction | 2019 |
| Thompson Commissioning Services Limited | Professional & scientific | 1997 |
| Thorndike Limited | Health & social care | 2014 |
| Threads by Jade Cocksedge Ltd | Other services | 2024 |
| Three Four Ventures Ltd | Professional & scientific | 2025 |
| Three Legged Stool Ltd | Professional & scientific | 2011 |
| Thrifty Nomads Limited | Information & communication | 2025 |
| THS Virtual Solutions Limited | Administrative & support | 2024 |
| Tiardo Group Limited | Construction | 2026 |
| Tiardo Ltd | Construction | 2020 |
| Tiatc Ltd | Professional & scientific | 2019 |
| Tibble Murray Woods Ltd | Construction | 2005 |
| Tideway Barge Company Limited | Administrative & support | 2015 |
| Tideway Investment Properties Ltd | Real estate | 2022 |
| Tiffs Hair Limited | Other services | 2023 |
| Tiger Clubs Limited | Education | 2017 |
| Tiger Scaffolding Ltd | Construction | 2022 |
| Tightlinesolutions Limited | Information & communication | 2007 |
| TIJ Interior Design Limited | Professional & scientific | 2018 |
| Tilbs Flooring Services Limited | Construction | 2008 |
| Tilefast Limited | Construction | 2019 |
| Tiling Specialist Solutions Ltd | Construction | 2025 |
| Tilt Engineering and Design Ltd | Professional & scientific | 2022 |
| Time and Tide Theatre Company Ltd | Arts & recreation | 2010 |
| Time Christmas Ltd | Wholesale & retail | 2018 |
| Time to Shine Property Maintenance Ltd | Administrative & support | 2024 |
| TIME2PROTECT Ltd | Education | 2012 |
| Timeless Care, Tending and Maintenance Ltd | Manufacturing | 2024 |
| Timelessdesignsandbuild Ltd | Construction | 2011 |
| Tina Talks Ltd | Information & communication | 2025 |
| Tinned Salmon Ltd | Professional & scientific | 2018 |
| Tinnini' S Ltd | Other services | 2023 |
| Tinta ART2000 Limited | Transport & logistics | 2015 |
| Tinytribe Childcare Ltd | Health & social care | 2026 |
| Tiptop Cleaners Ltd | Administrative & support | 2021 |
| Tissera Services Ltd | Information & communication | 2007 |
| Titan Integration Group Ltd | Information & communication | 2026 |
| Titan Stts Ltd | Wholesale & retail | 2018 |
| Titanborn Ltd | Education | 2019 |
| Tiwalola Properties Ltd | Real estate | 2026 |
| TJ10 Limited | Real estate | 2022 |
| TJB Airconditioning & Controls Ltd | Energy | 2026 |
| Tjcr Electricals Ltd | Construction | 2025 |
| TJM Rentals Ltd | Administrative & support | 2023 |
| TJZ Leisure Ltd | Arts & recreation | 2025 |
| TK Fibre Limited | Information & communication | 2017 |
| TK Property Holdings LLP | | 2019 |
| TK Sunshine Properties Ltd | Households | 2022 |
| TKD Costless Grocery Ltd | Wholesale & retail | 2022 |
| TKD Estate Ltd | Real estate | 2025 |
| Tkklr Ltd | Wholesale & retail | 2008 |
| TKO Investment & Consultancy Ltd | Administrative & support | 2012 |
| Tksr Properties Ltd | Real estate | 2019 |
| TLC Ventilation Limited | Manufacturing | 2024 |
| TM TAN Ltd | Construction | 2022 |
| TMC Assist (Training) Ltd | Administrative & support | 2016 |
| TME Supplies Ltd | Wholesale & retail | 2023 |
| Tmrl Property Group Limited | Real estate | 2014 |
| TMT Maintenance Limited | Administrative & support | 2024 |
| TN Decor Ltd | Construction | 2015 |
| TNG Growth Agency Ltd | Information & communication | 2026 |
| Tnns Fashion Ltd | Wholesale & retail | 2023 |
| Tnoservices Ltd | Professional & scientific | 2022 |
| TNT ALL Tasks Ltd | Administrative & support | 2025 |
| Toader Nicolae 0778 Limited | Transport & logistics | 2014 |
| Tobea Support Limited | Health & social care | 2020 |
| Tobea Support Solutions Ltd | Administrative & support | 2023 |
| Tobi Akiode & Co. Limited | Professional & scientific | 2014 |
| Tobiana Ltd | Professional & scientific | 2012 |
| Tobias & Charles Real Estate Ltd | Real estate | 2022 |
| Todorova PM Limited | Professional & scientific | 2023 |
| Tofts Tutors Ltd | Education | 2016 |
| Together for Send CIC | Education | 2025 |
| Tokific Limited | Professional & scientific | 2025 |
| Toks Investment Limited | Real estate | 2021 |
| Tolly's Garage Ltd | Wholesale & retail | 2022 |
| Toluwanimi UK Ltd | Wholesale & retail | 2025 |
| Tomasko Ltd | Transport & logistics | 2018 |
| Tommy Clark Tree & Ground Contractors Ltd | Administrative & support | 2016 |
| Tonbridge High Street Ltd | Real estate | 2025 |
| Tonugo Limited | Health & social care | 2019 |
| Tool Empire Ltd | Wholesale & retail | 2023 |
| Top Ace Properties Ltd | Real estate | 2017 |
| Top Line Finance Ltd | Professional & scientific | 2024 |
| Top of the Hill Pre-School Ltd | Education | 2024 |
| Topgate Services Ltd | Administrative & support | 2021 |
| Toppers Consultancy Limited | Wholesale & retail | 2014 |
| Toppers Property Solutions Limited | Real estate | 2019 |
| Toprank Management Ltd | Real estate | 2021 |
| Topstyle Paving and Resinbond Ltd | Construction | 2019 |
| Topstyle Paving Ltd | Construction | 2025 |
| TOR Hospitality Limited | Hospitality | 2018 |
| TOR Real Estate Limited | Real estate | 2026 |
| Torva Tiling Tools Ltd | Manufacturing | 2023 |
| Tosc Developments Ltd | Real estate | 2024 |
| Total Detailing Solutions Ltd | Wholesale & retail | 2026 |
| Total Flow Services Ltd | Water & waste | 2025 |
| Total Lifting Solutions Limited | Financial services | 2021 |