| Tailormade Lettings Ltd | Real estate | 2026 |
| Take 3 Action Academy Ltd | Arts & recreation | 2018 |
| Take 3 Agency Ltd | Administrative & support | 2019 |
| Talis Legal Recruitment (London) LLP | | 2024 |
| Talk to David Ltd | Administrative & support | 2012 |
| Talk-Tec Limited | Wholesale & retail | 2015 |
| Talo Build Ltd | Construction | 2019 |
| Talo Elements Holdings Ltd | Financial services | 2017 |
| Talo Elements Ltd | Construction | 2017 |
| Talo Manufacturing Ltd | Manufacturing | 2023 |
| Tamil Para Sports | Arts & recreation | 2016 |
| Tanzo Technologies Ltd | Information & communication | 2021 |
| Taomc Ltd | Professional & scientific | 2018 |
| Tati Baker Art Ltd | Wholesale & retail | 2026 |
| Taurus Waste Recycling (Holdings) Limited | Water & waste | 2001 |
| Taurus Waste Recycling Limited | Water & waste | 1980 |
| Taverns to Go UK Limited | Wholesale & retail | 2026 |
| Taylor Made Cleaning Services Limited | Administrative & support | 2016 |
| Tazwell Enterprises Ltd | Education | 2022 |
| Tc's Event Catering Ltd | Hospitality | 2015 |
| TDM Entertainment Limited | Manufacturing | 2022 |
| TE Tracks Ltd | Professional & scientific | 2025 |
| Techat Ltd | Manufacturing | 2021 |
| Techex Consulting Limited | Information & communication | 2025 |
| Technitron Research Ltd | Information & communication | 2024 |
| Techpot Limited | Information & communication | 2014 |
| Tecna UK Ltd | Manufacturing | 2007 |
| Tecna WW Ltd | Real estate | 2015 |
| Teeboxx Ltd | Education | 2025 |
| Tejnoor Limited | Construction | 2023 |
| Tekweb Computer Services Limited | Information & communication | 2018 |
| Tempest House Freehold Limited | Households | 2024 |
| Tengen Ltd | Professional & scientific | 2022 |
| Tenso UK Ltd | Wholesale & retail | 2012 |
| Tenth MAN Limited | Professional & scientific | 2025 |
| TEO Consulting Limited | Administrative & support | 2015 |
| Teppervision Ltd | Information & communication | 2026 |
| Tepstv Limited | Information & communication | 2019 |
| Tequra Ltd | Information & communication | 2011 |
| Terra Flora Landscapes Limited | Administrative & support | 2026 |
| Terra Supra Limited | Administrative & support | 2012 |
| Terraform Services & Solutions Ltd | Construction | 2023 |
| Tervia Consulting Ltd | Professional & scientific | 2019 |
| Tesst Consultancy Ltd | Information & communication | 2022 |
| Testability Limited | Professional & scientific | 2015 |
| TF Sound Limited | Information & communication | 2019 |
| TFR Group Ltd | Wholesale & retail | 2023 |
| TFU Consulting Ltd | Information & communication | 2026 |
| TGC Aviation Services Limited | Professional & scientific | 2002 |
| TH Wentworths Financial Ltd | Professional & scientific | 2012 |
| TH Wentworths Limited | Professional & scientific | 2014 |
| Thakali Welfare Society UK | Other services | 2016 |
| Thames Landscaping Limited | Administrative & support | 2024 |
| Thames Locks & Property Services Ltd | Manufacturing | 2022 |
| Thames Valley Care Ltd | Health & social care | 2018 |
| Thames Valley Visuals Limited | Wholesale & retail | 1986 |
| Thankyou Online Limited | Information & communication | 2023 |
| That Studio Space Ltd | Arts & recreation | 2022 |
| THE Allen Groupe Limited | Other services | 2008 |
| THE Art Bar Ltd | Wholesale & retail | 2023 |
| THE Art of Intuition Ltd | Health & social care | 2022 |
| THE Black FOX Entertainment Ltd | Information & communication | 2014 |
| THE Blucando Group Limited | Information & communication | 2021 |
| THE BMW Group Benefit Trust Limited | Professional & scientific | 1983 |
| THE Borough Coffee Co Limited | Wholesale & retail | 2012 |
| THE Brick People Ltd | Arts & recreation | 2023 |
| THE Bryony Management Company Limited | Real estate | 1988 |
| THE Bumble BEE Cafe Limited | Hospitality | 2018 |
| THE CHECKMATE24 Ltd | Wholesale & retail | 2025 |
| THE Collection Property Capital Limited | Administrative & support | 2009 |
| THE Cove Learning Trust | Education | 2013 |
| THE Crab Limited Limited | Hospitality | 2025 |
| THE Culture Formula Ltd | Professional & scientific | 2024 |
| THE Data Deli Ltd | Information & communication | 2014 |
| THE Digital Agency Limited | Professional & scientific | 2012 |
| THE Edit by Nerrisa Ltd | Wholesale & retail | 2020 |
| THE Enhanced Property Media Group Limited | Real estate | 2022 |
| THE Everest Himalayan Group Limited | Financial services | 2020 |
| THE Everlearner Limited | Education | 2016 |
| THE Face Expert Hampshire Ltd | Other services | 2025 |
| THE Fairground Café Ltd | Hospitality | 2020 |
| THE Fascia Place Group Limited | Financial services | 2014 |
| THE Fascia Place Limited | Manufacturing | 1996 |
| THE Finest Reptiles and Exotics Limited | Wholesale & retail | 2017 |
| THE Football Ramble Ltd | Information & communication | 2008 |
| THE Future for Human Evolution , Safety and Protection Limited | Professional & scientific | 2025 |
| THE Garden Joinery Company Limited | Administrative & support | 2009 |
| THE Ghetto Film School Limited | Professional & scientific | 2020 |
| THE Good Place to Live Ltd | Real estate | 2025 |
| THE Grass Roots Trading Company Limited | Wholesale & retail | 1995 |
| THE Green Partnership Group Ltd | Professional & scientific | 2022 |
| THE Home Restorator Ltd | Households | 2023 |
| THE Home Restorator Roofing & Guttering Ltd | Construction | 2024 |
| THE House of Dosai Ltd | Manufacturing | 2020 |
| THE Indy Co Media Limited | Information & communication | 2013 |
| THE Little Grey Salon Limited | Other services | 2023 |
| THE Little Platter Company Ltd | Hospitality | 2020 |
| THE Magnet Consultant Ltd | Professional & scientific | 2025 |
| THE MAN That CAN Limited | Information & communication | 2026 |
| THE Occupiers Ministries | Education | 2025 |