| Tisa Foods Limited | Wholesale & retail | 2025 |
| Tisuu Consulting & Services Ltd | Health & social care | 2026 |
| Titanium IT Services Limited | Information & communication | 2013 |
| Titbit Agritech Ltd | Wholesale & retail | 2021 |
| Tivarus Ltd | Real estate | 2021 |
| TJ Building and Maintenance Ltd | Construction | 2016 |
| Tj&Ts Limited | Real estate | 2020 |
| Tjcp Consultants Ltd | Professional & scientific | 2014 |
| TJH Investments Limited | Financial services | 2023 |
| Tjsz Limited | Construction | 2024 |
| TK Medi-Spa International UK Ltd. | Wholesale & retail | 2021 |
| TKB Tech Solutions Ltd | Information & communication | 2024 |
| Tksoutlet Ltd | Wholesale & retail | 2025 |
| TKT Retail Ltd | Wholesale & retail | 2024 |
| Tlaloc Mexican Food Ltd | Hospitality | 2023 |
| TM Airport LUX Ltd | Transport & logistics | 2025 |
| TM Consultancy Group Limited | Extraterritorial | 2025 |
| TMA International Liaison Limited | Professional & scientific | 2024 |
| Tmac Global Ltd | Information & communication | 2026 |
| TME London Limited | Construction | 2023 |
| TMO Health Ltd | Health & social care | 2026 |
| TMR Events Ltd | Information & communication | 2022 |
| TMS Fruit & Vegetables Limited | Wholesale & retail | 1997 |
| TMS Offshore Limited | Wholesale & retail | 2014 |
| Tmsdrawings Limited | Professional & scientific | 2018 |
| TN Vels Ltd | Wholesale & retail | 2026 |
| Tobe&Up Eduventures Ltd | Education | 2024 |
| Today Today CIC | Real estate | 2025 |
| Tofan Ltd | Wholesale & retail | 2023 |
| Together WE Create Harmony CIC | Arts & recreation | 2025 |
| Tokad Fusion Ltd | Construction | 2022 |
| Tokhi Optical Ltd | Health & social care | 2016 |
| Toleris Ltd | Information & communication | 2026 |
| Tomato Meta Productions Ltd | Information & communication | 2024 |
| Toobas Enterprise Ltd | Wholesale & retail | 2025 |
| Tools Hub Limited | Wholesale & retail | 2025 |
| Top Class 2 Ltd | Wholesale & retail | 2026 |
| Top Cleaning JP Limited | Administrative & support | 2025 |
| Top Fenders Limited | Transport & logistics | 2006 |
| Top Fitting Limited | Other services | 2011 |
| Top G Labs Ltd | Wholesale & retail | 2024 |
| Top JOB London Limited | Other services | 2012 |
| Top Marine Services Global Limited | Administrative & support | 2026 |
| Top Plastering Ltd | Construction | 2019 |
| Top Style Flooring Ltd | Construction | 2024 |
| Top West Enterprise Limited | Wholesale & retail | 2022 |
| Topaz UK Investments Limited | Real estate | 2026 |
| Topbeach Ltd | Financial services | 2018 |
| Topex Holdings Limited | Financial services | 2019 |
| Topex Properties Limited | Real estate | 2019 |
| Topnut International Limited | Administrative & support | 2016 |
| Torq Communication Ltd | Wholesale & retail | 2026 |
| Torquay Leisure Limited | Real estate | 2013 |
| Torrington House Management Co. Limited | Households | 1997 |
| TOS Bars (Wembley) Ltd | Hospitality | 2023 |
| Toss'N'Go Limited | Wholesale & retail | 2025 |
| Tosuk Ltd | Education | 2021 |
| Total Care Management Ltd | Construction | 2025 |
| Total Investments Group Limited | Real estate | 2017 |
| Total Property Care 01 Ltd | Extraterritorial | 2025 |
| Total Serenity Ltd | Health & social care | 2020 |
| Total Way Logistics Ltd | Mining & quarrying | 2018 |
| Totally Green Limited | Information & communication | 2010 |
| Totallydating Limited | Information & communication | 2011 |
| Tots & ME Ltd | Wholesale & retail | 2025 |
| TOU Agency Ltd | Other services | 2020 |
| Touch Designs and More Ltd | Professional & scientific | 2021 |
| Touching Hearts Home Care Limited | Health & social care | 2025 |
| Tower Leisure Limited | Hospitality | 2013 |
| Towers Business Park Management Company Limited | Real estate | 1991 |
| Toys Kingdom Ltd | Wholesale & retail | 2026 |
| Toza`S Catering Limited | Hospitality | 2008 |
| Tozey Furniture International Co Limited | Wholesale & retail | 2020 |
| TP GBS Ltd | Construction | 2019 |
| TP2SMILES Limited | Real estate | 2021 |
| TPC Agreements Ltd | Real estate | 2019 |
| TPN London Ltd | Construction | 2015 |
| TPP Contractors Ltd | Construction | 2017 |
| Tpsmiles Limited | Health & social care | 2021 |
| TR Legal Consultancy Limited | Professional & scientific | 2017 |
| Track Bound USA Limited | Other services | 2018 |
| Tracus Group Ltd | Energy | 2020 |
| Trade Center Limited | Wholesale & retail | 2019 |
| Trade Link Goods Ltd | Wholesale & retail | 2026 |
| Tradelink Horizon Limited | Wholesale & retail | 2025 |
| Tradenest Exports Ltd | Wholesale & retail | 2025 |
| Trades Made Ltd | Wholesale & retail | 2024 |
| Tradia Capital Academy Ltd | Information & communication | 2025 |
| Trading Post Limited(The) | Administrative & support | 1938 |
| Traditionally Trendy Ltd | Wholesale & retail | 2020 |
| Training Square London Ltd | Information & communication | 2011 |
| Trandent Ltd | Health & social care | 2025 |
| Transactbox Global IT Services Ltd | Information & communication | 2023 |
| Transfer Direct Ltd | Financial services | 2019 |
| Transfer on Go Ltd | Financial services | 2023 |
| Transformation LAB Limited | Other services | 2019 |
| Transportmania UK Ltd | Transport & logistics | 2026 |
| Transputec Development Ltd | Real estate | 2012 |
| Transputec Limited | Information & communication | 1997 |
| Travdirect Ltd | Professional & scientific | 2026 |