| Tatrana Consulting Ltd | Professional & scientific | 2025 |
| Tatva Enterprises Ltd | Professional & scientific | 2020 |
| Taunt Lettings Ltd | Real estate | 2026 |
| Taxi ELA Ltd | Transport & logistics | 2024 |
| Taylor MAC Limited | Construction | 2011 |
| TCA DR Limited | Health & social care | 2024 |
| TCR Special Effects Limited | Administrative & support | 2023 |
| TD Trading Ltd | Administrative & support | 2019 |
| Teaco Associates Limited | Professional & scientific | 2010 |
| Team Pest Control Limited | Other services | 2025 |
| Teatum & Teatum Limited | Real estate | 2006 |
| Tech Tech Trading Limited | Wholesale & retail | 2020 |
| Tech Traders Global Limited | Wholesale & retail | 2026 |
| Technalysis Limited | Information & communication | 2015 |
| Technical Merritt Ltd | Information & communication | 2023 |
| Technoglow Services Limited | Wholesale & retail | 2024 |
| Technosource Global Limited | Information & communication | 2022 |
| Tectrix Global Limited | Extraterritorial | 2011 |
| TED Homes Limited | Real estate | 2018 |
| Tehit Ltd | Information & communication | 2025 |
| Temac Limited | Real estate | 2025 |
| TEN Maintenance Limited | Administrative & support | 2024 |
| Tentpegs Limited | Wholesale & retail | 2026 |
| Terayza Ltd | Professional & scientific | 2025 |
| Terravale Property Ltd | Real estate | 2026 |
| Tesrex Limited | Information & communication | 2016 |
| Tfpn Events Ltd | Professional & scientific | 2021 |
| TGA Investments Ltd | Financial services | 2023 |
| TGJ Property Limited | Real estate | 2017 |
| Thackreg Property Limited | Real estate | 2024 |
| Thakkar UK Holdings Limited | Financial services | 2026 |
| Thalassia Ltd | Professional & scientific | 2025 |
| Thames Industrial Estate Limited | Construction | 2001 |
| Thanki MD Associates Limited | Wholesale & retail | 2011 |
| Thapar Properties Ltd | Construction | 2023 |
| Tharu Convenience Store Ltd | Wholesale & retail | 2014 |
| Tharvat Ltd | Hospitality | 2018 |
| That Data GUY Limited | Information & communication | 2016 |
| That Production Company Ltd | Administrative & support | 2026 |
| Thatlabfrank Ltd | Professional & scientific | 2023 |
| Thats a Wrap Group Ltd | Wholesale & retail | 2026 |
| THE 15 Colinette Road Management Company Limited | Real estate | 1987 |
| THE ASH Partnership Limited | Professional & scientific | 2011 |
| THE Baby Guru Ltd | Education | 2018 |
| THE Bike Shop (North Harrow) Limited | Wholesale & retail | 2007 |
| THE Block Fashion Limited | Wholesale & retail | 2007 |
| THE Chipperfield Boot Ltd | Real estate | 2023 |
| THE Chorleywood Coffee Mill Co Limited | Hospitality | 2009 |
| THE Clancy Workshop Ltd | Arts & recreation | 2023 |
| THE Clarity Lady Limited | Professional & scientific | 2010 |
| THE Coach House New Build Ltd | Construction | 2025 |
| THE COX Boys Holdings Ltd | Financial services | 2025 |
| THE Crepe Project Ltd | Hospitality | 2025 |
| THE Darts Dimension Limited | Wholesale & retail | 2021 |
| THE Dell (Chorleywood) Residents Limited | Households | 2010 |
| THE Denham Partnership Limited | Health & social care | 2013 |
| THE Dial UP Club Limited | Other services | 2026 |
| THE Dog House Kingston Ltd | Other services | 2025 |
| THE Dogs Residence Ltd | Other services | 2025 |
| THE Dolce Vita Italian Properties Ltd | Real estate | 2016 |
| THE Forge Ricky RTM Co Ltd | Households | 2018 |
| THE Freed From Company Limited | Hospitality | 2024 |
| THE Graham Stack Soccer Academy Ltd | Arts & recreation | 2017 |
| THE Grove Croxley Green Limited | Households | 2021 |
| THE Hadleigh Clinic Holdings Limited | Health & social care | 2011 |
| THE Hadleigh Clinic Limited | Health & social care | 2004 |
| THE Hannlie Company Ltd | Professional & scientific | 2018 |
| THE Happy Rooster Ltd | Hospitality | 2025 |
| THE Harpists Ltd | Wholesale & retail | 2025 |
| THE House of Wrath Ltd | Manufacturing | 2025 |
| THE HR Office Ltd | Professional & scientific | 2026 |
| THE Jacobs Seven Consultancy Ltd | Professional & scientific | 2009 |
| THE Kaiya Foundation for Children With Very High Risk Leukaemia | Health & social care | 2021 |
| THE Kingsley Hotel Ltd | Hospitality | 2025 |
| THE Kitchen Croxley Ltd | Wholesale & retail | 2014 |
| THE Kitchen Family Ltd | Real estate | 2021 |
| THE Lapstone PUB Limited | Hospitality | 2020 |
| THE Little Cake Boutique London Limited | Manufacturing | 2020 |
| THE Little Creators Club Ltd | Hospitality | 2022 |
| THE Lodge New Build Ltd | Construction | 2025 |
| THE Lovick Group Ltd | Administrative & support | 2021 |
| THE Marble & Granite Centre Limited | Wholesale & retail | 1993 |
| THE Marketing Addition Ltd | Professional & scientific | 2026 |
| THE Meat Like IT Used to BE Company Limited | Wholesale & retail | 2006 |
| THE Message Machine Limited | Professional & scientific | 1998 |
| THE Metropolitan RTM Company Limited | Households | 2024 |
| THE Muslin Company Ltd | Wholesale & retail | 2025 |
| THE New Road Management Company (1987) Limited | Professional & scientific | 1987 |
| THE New Walton Pier Company Limited | Arts & recreation | 1938 |
| THE NU Neighbours Ltd | Real estate | 2017 |
| THE Old Vicarage (Rickmansworth) Management Company Limited | Real estate | 2015 |
| THE Online Studio 24 Limited | Professional & scientific | 2007 |
| THE Original Footman Limited | Administrative & support | 2010 |
| THE Osteopathic House Ltd | Health & social care | 2022 |
| THE Paddock UHR Management Company Ltd | Real estate | 2020 |
| THE Paul Trust | Extraterritorial | 2009 |
| THE PAW Parlour Ltd | Other services | 2020 |
| THE Plain Clothing Company Ltd | Manufacturing | 2010 |
| THE Player Piano Group | Other services | 2013 |
| THE Purposeful Practice Ltd | Other services | 2021 |