| Tacs 166 Ltd | Real estate | 2017 |
| Tacs Accountants & Co Ltd | Professional & scientific | 2012 |
| Tacs Accountants Limited | Professional & scientific | 2003 |
| Tactical Security Services Ltd | Administrative & support | 2013 |
| Tadco Property Management Limited | Real estate | 2010 |
| Tadka Holland Park Ltd | Hospitality | 2023 |
| TAF Fast Food Ltd | Hospitality | 2025 |
| Tafaoel Limited | Financial services | 2021 |
| TAG Consulting Services Ltd | Information & communication | 2015 |
| Taha Autos Ltd | Wholesale & retail | 2015 |
| Taha Products Ltd | Wholesale & retail | 2023 |
| Tahan Ltd | Hospitality | 2019 |
| Tahir Chemicals UK Ltd | Professional & scientific | 2025 |
| Tahira Halal Meat Ltd | Hospitality | 2022 |
| Tahpi UK Limited | Health & social care | 2016 |
| Tailfin Solutions Limited | Professional & scientific | 2012 |
| Tailor Fitness Ltd | Education | 2024 |
| Tailor Made Ltd | Wholesale & retail | 2022 |
| Tailor Made Plumbing Limited | Construction | 2025 |
| Tailored Architecture & Interiors Ltd. | Professional & scientific | 2015 |
| Tailored Social Work Ltd | Health & social care | 2022 |
| Taimoor Shah Services Ltd | Financial services | 2020 |
| Taimoor Shah Travel Ltd | Administrative & support | 2021 |
| Tainath Ltd | Real estate | 2025 |
| TAJ Securities Company Number Two Limited | Hospitality | 2017 |
| TAJ Securities Ltd | Hospitality | 2015 |
| Taj's West Coast UK Ltd | Professional & scientific | 2025 |
| Tajir Commerce Ltd | Information & communication | 2025 |
| Tajonomic Consulting Limited | Professional & scientific | 2015 |
| Takas World Group Ltd | Mining & quarrying | 2023 |
| Takatak Kitchen Ltd | Hospitality | 2025 |
| Takershi Creations Ltd | Professional & scientific | 2025 |
| Takinomo Limited | Other services | 2021 |
| Takoma Bilateral Ltd | Transport & logistics | 2023 |
| Taksh Online Limited | Wholesale & retail | 2021 |
| Talaarez Group Limited | Real estate | 2018 |
| Talaarez Real Estate Ltd | Real estate | 2019 |
| Talaviya Enterprises Ltd | Wholesale & retail | 2025 |
| Talbots Furnishers Ltd | Wholesale & retail | 2024 |
| Talent Alchemy Limited | Administrative & support | 2023 |
| Talent Analytix Ltd | Information & communication | 2019 |
| Talent Collectiv Offshore Solutions Ltd | Administrative & support | 2024 |
| Talent Horizon Global Services Ltd | Professional & scientific | 2020 |
| Talent Professionals Limited | Administrative & support | 2024 |
| Talent Roar Ltd | Administrative & support | 2025 |
| Talent Works Studio Limited | Administrative & support | 2013 |
| Talents Squared Limited | Financial services | 2018 |
| Taliesin Strings Ltd | Arts & recreation | 2021 |
| Talina Builders Limited | Construction | 1978 |
| Talina Group Limited | Financial services | 2026 |
| Talina Holdings Limited | Financial services | 2017 |
| Talisman Entertainments Limited | Arts & recreation | 2023 |
| Talissa Cera Limited | Wholesale & retail | 2023 |
| Talk With US LLP | | 2015 |
| Talking Rubbish Recycling Limited | Extraterritorial | 2011 |
| Talking Rubbish Waste Solutions Limited | Water & waste | 2014 |
| Tall Bird Consulting Limited | Professional & scientific | 2022 |
| Talla Media Limited | Professional & scientific | 2023 |
| Tallulah&Cospecialistrecruitment Ltd | Administrative & support | 2025 |
| Talman Grove (Freehold) Limited | Real estate | 1998 |
| Talugdar Limited | Professional & scientific | 2021 |
| TAM 85 Limited | Other services | 2024 |
| Tamanna Hair and Beauty Ltd | Other services | 2015 |
| Tamanna Skin and Cosmetics Limited | Other services | 2019 |
| Tamarind and Cumin Management Company Limited | Households | 1997 |
| Tamba & Manzinga Limited | Information & communication | 2018 |
| Tamber Construction Limited | Construction | 2020 |
| Tame Group Limited | Administrative & support | 2022 |
| Tamesis Place Management Company Limited | Households | 2000 |
| Tamil Builders Limited | Construction | 2021 |
| Tamu Momo Ltd | Hospitality | 2025 |
| TAN & Sons Ltd | Construction | 2014 |
| Tana Investments Limited | Professional & scientific | 2013 |
| Tanaz Godiwalla Foods Private (UK) Limited | Wholesale & retail | 2020 |
| Tandem IT Solutions Limited | Information & communication | 2011 |
| Tandem Marketing Worldwide Limited | Professional & scientific | 2024 |
| Tandii Ltd | Wholesale & retail | 2022 |
| Tandon Holdings UK Limited | Information & communication | 2022 |
| Tandoor Norbury Ltd | Hospitality | 2023 |
| Tanga Wizi Ltd | Hospitality | 2003 |
| Tangent Ltd | Construction | 2023 |
| Tania Express Ltd | Transport & logistics | 2024 |
| Tanic Digital Limited | Administrative & support | 2015 |
| Taninvest Limited | Financial services | 2012 |
| Tanishvi Limited | Financial services | 2018 |
| Tanishvi Properties Limited | Real estate | 2024 |
| Tank Financial Solutions Limited | Professional & scientific | 2017 |
| Tank Property Limited | Real estate | 2021 |
| Tank Sport Limited | Arts & recreation | 2024 |
| Tankom Ltd | Professional & scientific | 2011 |
| Tanna Homes and Properties Ltd | Real estate | 2019 |
| Tannech Clinical Limited | Health & social care | 2014 |
| Tannit International Ltd | Wholesale & retail | 2022 |
| Tanpri Properties Limited | Real estate | 2021 |
| Tantalum Mining Ventures Limited | Mining & quarrying | 2022 |
| Tanvaz Ltd | Transport & logistics | 2026 |
| Tanya Burger Boutique Property Ltd | Real estate | 2026 |
| TAO Projects Ltd | Construction | 2025 |
| TAP Cleaners Ltd | Administrative & support | 2025 |
| TAP Painting Ltd | Construction | 2026 |