| Tees Valley Groundworks Ltd | Construction | 2007 |
| Teesdale Environmental Consulting Ltd | Professional & scientific | 2009 |
| Teine Limited | Administrative & support | 2025 |
| Telecoms Support Team Limited | Administrative & support | 2004 |
| Telekonnectors UK Limited | Information & communication | 2017 |
| Telosen Limited | Professional & scientific | 2026 |
| Teltech Projects NK Limited | Transport & logistics | 2016 |
| Temogo Limited | Information & communication | 2011 |
| Tempest Media Solutions Ltd | Arts & recreation | 2017 |
| Templeworld Limited | Administrative & support | 1985 |
| Tenacious Brands Ltd | Professional & scientific | 2019 |
| Tennyson Lodge South Freehold Limited | Real estate | 1997 |
| Tennyson Lodge South Management Company Limited | Real estate | 1988 |
| Teodoro Neurology Ltd | Health & social care | 2024 |
| Termstake Residents Management Limited | Administrative & support | 1987 |
| Terra Iberica Limited | Real estate | 1998 |
| Terrace 1 Limited | Real estate | 2008 |
| Terrestris - Division of Heuer Homes Ltd | Construction | 2022 |
| Terrier Industries Ltd | Other services | 2026 |
| Terrier Labs Ltd | Other services | 2026 |
| Tersia Paulse Consulting Limited | Other services | 2018 |
| Test Partners Ltd | Information & communication | 2001 |
| TET Ventures Ltd | Financial services | 2025 |
| Texture Sounds Ltd | Arts & recreation | 2022 |
| TFA Pubs Ltd | Hospitality | 2019 |
| Tgpt Ltd | Health & social care | 2021 |
| TH:2 Designs Ltd | Administrative & support | 2005 |
| Thames Development Holdings Limited | Financial services | 2020 |
| Thames Developments Group Limited | Construction | 2020 |
| Thames Holdings Ltd | Information & communication | 2013 |
| Thames Property Group Limited | Real estate | 2020 |
| Thames Property Investment Holdings Limited | Financial services | 2020 |
| THC Accountancy Services Limited | Professional & scientific | 2014 |
| THC Secretarial Services Limited | Administrative & support | 2007 |
| THE Affiliate AVE Ltd | Wholesale & retail | 2026 |
| THE Atlas Real Estate London Ltd | Real estate | 2019 |
| THE Avenue-Chip (PTY) Ltd | Professional & scientific | 2023 |
| THE Beach Factory Limited | Wholesale & retail | 1999 |
| THE Bech-Bailey Collection Ltd | Hospitality | 2025 |
| THE Belfast Press Limited | Information & communication | 2000 |
| THE Belvedere Freeholders Company Ltd | Households | 2012 |
| THE Big PIG Shindig Ltd | Hospitality | 2024 |
| THE Binks Effect Limited | Professional & scientific | 2023 |
| THE BIO Nano Centre Unlimited | Professional & scientific | 2007 |
| THE Birchman Group Limited | Professional & scientific | 2003 |
| THE Blonde Mouse Group Ltd | Real estate | 2003 |
| THE Body Coach Online Nutrition Limited | Information & communication | 2014 |
| THE Brickhub Limited | Construction | 2022 |
| THE Bridge Inn (Grinton) Ltd | Hospitality | 2023 |
| THE Buck Richmond Limited | Hospitality | 2016 |
| THE Buddhas Hand Ltd | Administrative & support | 2020 |
| THE Build Network UK Limited | Information & communication | 2026 |
| THE Burgess Principle Limited | Professional & scientific | 2026 |
| THE Business Exit Academy Ltd | Education | 2022 |
| THE Carbonite Drinks Company Limited | Wholesale & retail | 2024 |
| THE Carbonite Group Ltd | Financial services | 2023 |
| THE Careers Office | Education | 2021 |
| THE Center for Advanced Strategic Leadership Ltd | Information & communication | 2020 |
| THE Changement Consultancy Ltd. | Professional & scientific | 2016 |
| THE Cheese Press Limited | Wholesale & retail | 2025 |
| THE Cheesey Grin Company Limited | Wholesale & retail | 2011 |
| THE Chukka Boot Company Ltd | Manufacturing | 2018 |
| THE Clear Decisions Company Ltd | Information & communication | 2024 |
| THE Clinic at KEW Ltd | Health & social care | 2026 |
| THE Contractstore Limited | Information & communication | 2000 |
| THE Copper Kettle Reeth Limited | Hospitality | 2023 |
| THE Cross Keys Inn (Eppleby) Limited | Hospitality | 2022 |
| THE Crown (B.O.S.) Ltd | Hospitality | 2023 |
| THE Daily Physio Ltd | Health & social care | 2024 |
| THE Delicious Suite Ltd | Information & communication | 2024 |
| THE DHB Company Richmond Limited | Administrative & support | 2021 |
| THE Discerning Collection Ltd | Administrative & support | 2010 |
| THE Dog Grooming Cafe 88 Limited | Hospitality | 2023 |
| THE DYE Shop Limited | Wholesale & retail | 2009 |
| THE Elite Partnership International Ltd | Professional & scientific | 2020 |
| THE Equine Dental VET Ltd | Professional & scientific | 2018 |
| THE Ethical Investment Co-Operative Limited | Financial services | 1997 |
| THE Family Life Practice Ltd | Education | 2020 |
| THE Famous Firkin Limited | Hospitality | 2000 |
| THE Famous Grouse Limited | Manufacturing | 2024 |
| THE Farmers Arms (BOS) Ltd | Hospitality | 2019 |
| THE Fleece (North Yorkshire) Ltd | Hospitality | 2024 |
| THE Forge Health Clinic Ltd | Health & social care | 2020 |
| THE Foundation and Friends of the Royal Botanic Gardens, KEW | Other services | 1990 |
| THE Freemasons Arms of Nosterfield Limited | Hospitality | 2014 |
| THE Game Cart Company Limited | Hospitality | 2001 |
| THE Gate.Global Limited | Construction | 2016 |
| THE Gift of Gold Limited | Wholesale & retail | 2024 |
| THE Giggle Company and Friends Ltd | Arts & recreation | 2009 |
| THE Global Biodiversity Standard Ltd | Professional & scientific | 2025 |
| THE Go-To Podcast Company Limited | Information & communication | 2025 |
| THE Golden Lion (Richmond) Ltd | Hospitality | 2020 |
| THE Grove Edwardstone Limited | Real estate | 2025 |
| THE Hair Office Ltd | Health & social care | 2026 |
| THE Happy Post Company Limited | Wholesale & retail | 2022 |
| THE Hearsum Collection | Administrative & support | 2011 |
| THE Hearsum Family Limited | Hospitality | 1995 |
| THE Heritage Property Group (Marske Hall) Limited | Real estate | 2019 |
| THE Holiday Team Limited | Administrative & support | 2002 |
| THE Homework Club Limited | Education | 2019 |