| TAG My Thing Ltd | Information & communication | 2025 |
| Tahaq Ltd | Construction | 2018 |
| Tahatech Programme Services Ltd | Professional & scientific | 2023 |
| TAI Portfolio Limited | Real estate | 2024 |
| TAI Property Services Limited | Hospitality | 2025 |
| Tailleurgrace Ltd | Professional & scientific | 2017 |
| Taimoor Solutions Services Ltd | Administrative & support | 2018 |
| Taipi & Waess Ltd | Real estate | 2025 |
| TAJ Brothers Trading Ltd | Wholesale & retail | 2023 |
| Tajj Group Ltd | Hospitality | 2025 |
| Take Online Ltd | Wholesale & retail | 2020 |
| Takfa Electrical Contractors Limited | Construction | 2007 |
| Takhayyul Adabi Forum Limited | Information & communication | 2020 |
| Takida Ltd | Construction | 2023 |
| Talent Bridge Limited | Professional & scientific | 2025 |
| Talent Radish Limited | Wholesale & retail | 2023 |
| Talk FC CIC | Other services | 2026 |
| Talk TEL Limited | Manufacturing | 2014 |
| Talk to Cloud Ltd | Wholesale & retail | 2019 |
| Talking Coach Ltd | Other services | 2023 |
| Talktoiris CIC | Health & social care | 2022 |
| Tall Glass of Water UK Limited | Wholesale & retail | 2019 |
| Talley App Limited | Health & social care | 2020 |
| Tamache Limited | Administrative & support | 2019 |
| Tamarind Mews Management Ltd | Households | 2025 |
| Tamawwul LP | | 2021 |
| Tamba Day Nursery Ltd. | Education | 2003 |
| Tamba Group Limited | Other services | 2021 |
| Tame Motors Limited | Wholesale & retail | 2025 |
| Tamkam Ltd | Wholesale & retail | 2026 |
| Tamsey Financial Services Ltd | Financial services | 2017 |
| TAN Media & Software Ltd | Information & communication | 2025 |
| Tandt Risk Consultants Limited | Public administration | 2019 |
| Tandy and Inno's Ltd | Health & social care | 2023 |
| Taneuro Ltd | Wholesale & retail | 2025 |
| Tangel Properties Ltd | Real estate | 2024 |
| Tangible Securities Limited | Extraterritorial | 1980 |
| Tangles Free Hair & Beauty Ltd | Other services | 2011 |
| Tania Cleaning Service Limited | Wholesale & retail | 2026 |
| Tanishu Ltd | Professional & scientific | 2023 |
| Tank Medical Limited | Health & social care | 2013 |
| Tanmani Limited | Professional & scientific | 2020 |
| Tanoli Foods Ltd | Other services | 2022 |
| Tans Healthcare Services Ltd | Administrative & support | 2023 |
| Tantechai Solutions Ltd | Information & communication | 2025 |
| Tanz Beauty Zone Limited | Other services | 2018 |
| Tanzanite Solutions Ltd | Information & communication | 2019 |
| Tapbox Commerce Ltd | Wholesale & retail | 2026 |
| Tapersnfades Ltd | Other services | 2023 |
| Tara Spice Ltd | Hospitality | 2026 |
| Tarbrook Construction Limited | Construction | 2014 |
| Tarbrook Design & Build Limited | Construction | 2011 |
| Tardis PLC | Information & communication | 1996 |
| Target Contracts Furniture Ltd | Construction | 2011 |
| Target Group Euro Ltd | Wholesale & retail | 2017 |
| Target Sports World Franchising Ltd | Arts & recreation | 2023 |
| Tarnix Ltd | Wholesale & retail | 2025 |
| Tasaber Ltd | Wholesale & retail | 2025 |
| Tasbina Properties Ltd | Real estate | 2021 |
| Task Fiber Limited | Information & communication | 2025 |
| Tass Transport and Security Services Limited | Transport & logistics | 2020 |
| Taste Ibiza Limited | Arts & recreation | 2012 |
| Taste of London Limited | Other services | 2022 |
| Tasty Romford Limited | Hospitality | 2022 |
| Tasty-States Ltd | Hospitality | 2011 |
| Tata Bar & Grill Ltd | Hospitality | 2021 |
| Tatmor Ltd | Information & communication | 2024 |
| Tattoo Safe Regulation Limited | Education | 2025 |
| Taurus FXX Limited | Education | 2024 |
| Taurus Star Ltd | Real estate | 2024 |
| Tavistan Limited | Professional & scientific | 2011 |
| Tax & Accounting Consultants Ltd | Professional & scientific | 2012 |
| Tax & Legal Network Ukeig | | 1998 |
| Tax Consultancy Group Ltd | Professional & scientific | 2009 |
| Tax Elite Limited | Professional & scientific | 2021 |
| Tax Maths Accounting Ltd | Professional & scientific | 2024 |
| Tax Point Limited | Professional & scientific | 2010 |
| Taxclarity Financial Services Ltd | Professional & scientific | 2026 |
| Taxcode AI Ltd | Administrative & support | 2025 |
| Taxford Limited | Professional & scientific | 2025 |
| Taxido Limited | Transport & logistics | 2026 |
| Taxmore Consulting Ltd | Professional & scientific | 2019 |
| Taxsteins Ltd | Professional & scientific | 2021 |
| Taylor Associates (London) Ltd | Construction | 1999 |
| Tayy's Tips & Trims Ltd | Other services | 2024 |
| Tayyaba Quality Ltd | Wholesale & retail | 2023 |
| TB Building Ltd | Construction | 2026 |
| TBE Electrical Ltd | Construction | 2025 |
| Tbelz Health Care Limited | Health & social care | 2014 |
| TBK Projects Ltd | Professional & scientific | 2022 |
| TBS North Ltd | Construction | 2020 |
| TC Barr Woodworx Limited | Other services | 2015 |
| TC Family Ltd | Real estate | 2024 |
| TC Hospitality Ltd | Hospitality | 2011 |
| TCF Property Services Ltd | Real estate | 2025 |
| Tchixell Limited | Information & communication | 2022 |
| TCL Construction Essex Ltd | Construction | 2026 |
| TCL Group (London) Ltd | Financial services | 2019 |
| Tclarke Partners and Solutions Ltd | Administrative & support | 2024 |
| TCM Haulage Limited | Other services | 2004 |