| Tiffley Accountancy Limited | Professional & scientific | 2024 |
| Tiger Tree Limited | Hospitality | 2022 |
| TIGER2016 Ltd | Real estate | 2016 |
| Tigerlily Enterprises Ltd | Wholesale & retail | 2019 |
| Tigris Information Technologies Ltd | Information & communication | 2006 |
| Tilescape International Ltd | Construction | 2024 |
| TIM Mcbaj Visuals Ltd | Information & communication | 2025 |
| Tim's Drylining Ltd | Construction | 2019 |
| Timber Sash Solutions Limited | Construction | 2019 |
| Time 2 Meat Ltd | Wholesale & retail | 2020 |
| Time Relocation Limited | Extraterritorial | 2013 |
| Time Space Color UK Limited | Wholesale & retail | 2016 |
| TIME2B Ageing Gracefully Ltd | Health & social care | 2017 |
| Timewise Logistics Limited | Transport & logistics | 2009 |
| Timinah Services Ltd | Health & social care | 2010 |
| Tina Moore Limited | Health & social care | 2009 |
| Tino Contractors Ltd | Construction | 2022 |
| Tinsley Commercials Ltd | Wholesale & retail | 2011 |
| Tiny Champions Academy CIC | Education | 2025 |
| Tiny Champions Daycare Ltd | Health & social care | 2020 |
| Tiny Swimmers Ltd | Education | 2009 |
| Tinyhelpers Cleaning Limited | Administrative & support | 2025 |
| TIP Top Fitness Ltd | Arts & recreation | 2024 |
| Tipper Hire Limited | Extraterritorial | 1999 |
| Titan Logistics Limited | Transport & logistics | 2010 |
| Titan Pictures Ltd | Information & communication | 2023 |
| Titan Real Investment Ltd | Real estate | 2025 |
| Titanvehiclerelocations Ltd | Transport & logistics | 2025 |
| Titchfield Properties Limited | Real estate | 2013 |
| Titod Ltd | Financial services | 2015 |
| Tittam Investments Limited | Financial services | 2018 |
| Tiyes Treats Ltd | Manufacturing | 2025 |
| Tjjm Services Limited | Construction | 2025 |
| TJZ Holdings Ltd | Financial services | 2026 |
| TJZ Real Estate Ltd | Real estate | 2026 |
| TK 69 Limited | Other services | 2024 |
| TK Ioannou Limited | Real estate | 2019 |
| TK Mobile Mechanic Ltd | Wholesale & retail | 2020 |
| TKD Properties Ltd | Real estate | 2024 |
| TKK Construction Ltd | Construction | 2019 |
| TL (Beverley) Limited | Other services | 2020 |
| TL Everlasting Beauty Limited | Other services | 2017 |
| TLC Investments Holding Company Limited | Financial services | 2022 |
| Tlvn Limited | Other services | 2022 |
| TM Real Estate Group Limited | Real estate | 2026 |
| Tmat Investment Limited | Financial services | 2018 |
| TMB Spine Solutions Limited | Health & social care | 2015 |
| TMC Gyms Ltd | Arts & recreation | 2025 |
| TML Gyms Ltd | Arts & recreation | 2026 |
| TMM Consulting Limited | Information & communication | 2018 |
| Tmofx Ltd | Construction | 2026 |
| TMT 82 Ltd | Hospitality | 2017 |
| TMT Beauty Company Limited | Other services | 2022 |
| TNA Enterprises Ltd | Administrative & support | 2017 |
| TNA Investment Properties Ltd | Real estate | 2026 |
| TNA Putney Limited | Other services | 2023 |
| Tndr London Ltd | Hospitality | 2025 |
| TNJ Properties Ltd | Real estate | 2021 |
| TNL Projects Limited | Information & communication | 2011 |
| TNO Consulting Ltd | Professional & scientific | 2020 |
| TNS Property Services Ltd | Real estate | 2013 |
| TO Investment Limited | Real estate | 2013 |
| TOB1 Consulting Ltd | Professional & scientific | 2021 |
| Tobechi Consultancy Limited | Professional & scientific | 2020 |
| Tobtos LLP | | 2020 |
| Toby Clarke Consulting Limited | Information & communication | 2014 |
| Today's Generation | Other services | 2020 |
| Todward Properties Limited | Real estate | 2025 |
| Toffnic LLP | | 2026 |
| Toffs Properties Limited | Real estate | 2015 |
| Together WE Made IT Limited | Manufacturing | 2022 |
| Togher Construction Limited | Construction | 2004 |
| Togher Engineering Limited | Construction | 2005 |
| Togher Limited | Administrative & support | 2019 |
| Togoc Limited | Real estate | 2023 |
| Toguz Property Management Ltd | Households | 2023 |
| Toka Construction Limited | Construction | 2015 |
| Tola Construction Ltd | Construction | 2023 |
| Tolafinca Limited | Construction | 2025 |
| Tomato 26 Limited | Information & communication | 2011 |
| Tomaz Jefferson Ltd | Wholesale & retail | 2020 |
| Tomis Pro Consulting Ltd | Professional & scientific | 2020 |
| Tomiwa Lodging Ltd | Hospitality | 2025 |
| Tommy's Sports Coaching Ltd | Education | 2021 |
| Tomov 86 Ltd | Professional & scientific | 2014 |
| Tonersmart Limited | Extraterritorial | 2003 |
| Toni Montana Holdings Ltd | Financial services | 2025 |
| Toni&D Limited | Other services | 2018 |
| TONIAINSTA20 Ltd | Wholesale & retail | 2020 |
| Tonin Preni Ltd | Real estate | 2023 |
| Tonnik Services Limited | Financial services | 2018 |
| Tony & Brothers Construction Ltd | Construction | 2020 |
| Tony & VIC Limited | Other services | 2016 |
| Tony Fixers Ltd | Construction | 2025 |
| Tony Mcdonagh & Co Ltd. | Financial services | 1993 |
| Tooled-Up.Co.Uk. Limited | Extraterritorial | 2000 |
| Tooled-Up.Com Limited | Extraterritorial | 2000 |
| Tootell’S Heating Limited | Construction | 2025 |
| Top Bluetech Cars Ltd | Other services | 2015 |
| Top MAN Consultant Ltd | Other services | 2019 |