| THE London Meisner Company Limited | Arts & recreation | 2018 |
| THE London Sock Exchange Sock Company Ltd | Wholesale & retail | 2015 |
| THE Long and Short Ltd | Hospitality | 2017 |
| THE Lord's Brew Ltd | Wholesale & retail | 2025 |
| THE Lunch Club Ltd | Administrative & support | 2011 |
| THE Magic Scissors Trim Ltd | Other services | 2026 |
| THE Main Trip Ltd | Transport & logistics | 2025 |
| THE Makers of Limited | Arts & recreation | 2020 |
| THE Maris Practice Ltd | Health & social care | 2005 |
| THE Marlow Day Nursery Limited | Education | 2003 |
| THE Montgomery Court Management Company Limited | Real estate | 2014 |
| THE Moorlands Management (NO.1) Ltd. | Households | 1988 |
| THE Northern Oak Limited | Professional & scientific | 2024 |
| THE Oral Surgery Academy Limited | Administrative & support | 2013 |
| THE Organised Fairy Ltd | Administrative & support | 2024 |
| THE OU Cafe Limited | Administrative & support | 2017 |
| THE Outdoor Childhood Limited | Arts & recreation | 2026 |
| THE People Hive | Health & social care | 2017 |
| THE People's EAR Limited | Other services | 2013 |
| THE Permanent Make UP Studio Ltd | Other services | 2024 |
| THE Plumber GUY Ltd | Other services | 2008 |
| THE Project and Office Management Co. Limited | Professional & scientific | 2024 |
| THE Project and Office Manager Ltd | Professional & scientific | 2024 |
| THE Project Partners (Martech) Ltd | Information & communication | 2010 |
| THE Pugilist Ltd | Information & communication | 2015 |
| THE Puzzle Group Ltd | Wholesale & retail | 2016 |
| THE Real Junk Food Project - Twickenham C.I.C. | Hospitality | 2017 |
| THE Reality People Limited | Administrative & support | 2023 |
| THE Richmond Upon Thames School Trust | Education | 2014 |
| THE Richmond Walking Tours Company Limited | Administrative & support | 2025 |
| THE Ripple Effect London Ltd | Professional & scientific | 2022 |
| THE Rookie Book Club Ltd | Wholesale & retail | 2025 |
| THE Rugby Universe Ltd | Education | 2019 |
| THE Rugbycoffee Co. Limited | Wholesale & retail | 2020 |
| THE Rumba Animal Cancer Foundation | Professional & scientific | 2024 |
| THE Shan Academy Ltd | Education | 2024 |
| THE SKI PR Company Limited | Professional & scientific | 2009 |
| THE Small Gardens Cafe Ltd | Hospitality | 2020 |
| THE Soho Dining Company Limited | Hospitality | 2022 |
| THE Spiritual Healing Temple Limited | Arts & recreation | 2023 |
| THE Strawberry Hill Collection Trust | Arts & recreation | 2009 |
| THE Strawberry Hill Trust | Arts & recreation | 2002 |
| THE Swan Pictures Ltd | Information & communication | 2026 |
| THE Transport and Traffic Consultancy Limited | Professional & scientific | 1994 |
| THE Travel P.R. Company Limited | Administrative & support | 1996 |
| THE Travel PR and Marketing Company Limited | Professional & scientific | 1999 |
| THE Tray Framer Ltd | Manufacturing | 2024 |
| THE Trimble Energy Company Ltd. | Professional & scientific | 1985 |
| THE Twickenham PUB Company Limited | Hospitality | 2014 |
| THE Twins Twickenham Ltd | Other services | 2025 |
| THE UK Flights Ltd | Administrative & support | 2009 |
| THE VA Agency Ltd | Administrative & support | 2015 |
| THE VR Tales Ltd | Information & communication | 2019 |
| THE Waldegrave Trust | Education | 2012 |
| THE Wild Pause Limited | Education | 2026 |
| THE Y Syndicate Ltd | Professional & scientific | 2024 |
| THEDIGITAL360 Ltd | Wholesale & retail | 2020 |
| Thegiglounge Ltd | Information & communication | 2021 |
| Themeli UK Ltd | Construction | 2020 |
| Themenu Ltd | Information & communication | 2022 |
| Thenhurst Agricultural Limited | Agriculture & fishing | 1977 |
| Theplug. Limited | Information & communication | 2023 |
| Think.Technology Limited | Information & communication | 2024 |
| Thinking CAP Communications Ltd | Information & communication | 2014 |
| Thinking Money Limited | Education | 2003 |
| Third Tree Productions Ltd. | Professional & scientific | 2016 |
| Thirdeye Tech Limited | Information & communication | 2020 |
| Thirteen Nineteen Limited | Professional & scientific | 2008 |
| Thirty Fifty Limited | Wholesale & retail | 2002 |
| Thirtyfifty Wine & Spirit Training Company Limited | Education | 2022 |
| This Beautiful Fantastic UK Limited | Information & communication | 2013 |
| Thistletail Ltd | Professional & scientific | 2023 |
| Thomas Kirchmaier Limited | Professional & scientific | 2002 |
| Thomas Lovelock Limited | Professional & scientific | 2013 |
| Thomas Mccloskey Ltd | Real estate | 2024 |
| Thorncliffe Investments Ltd | Real estate | 2018 |
| Thornrest Residential Limited | Financial services | 2016 |
| Thoughtlume Ltd | Information & communication | 2025 |
| Thranation Limited | Other services | 2020 |
| Thread Vision Ltd | Wholesale & retail | 2017 |
| THREE70 Lounge Ltd | Hospitality | 2025 |
| Threestones Properties Ltd | Hospitality | 2025 |
| Threshing Sledge Consulting Limited | Professional & scientific | 2026 |
| Thrive Cafe Limited | Hospitality | 2024 |
| Thrive Zone 10 Limited | Real estate | 2025 |
| Thrive Zone 2 Limited | Real estate | 2025 |
| Thrive Zone 3 Limited | Real estate | 2025 |
| Thrive Zone 4 Limited | Real estate | 2025 |
| Thrive Zone 5 Limited | Real estate | 2025 |
| Thrive Zone 6 Limited | Real estate | 2025 |
| Thrive Zone 7 Limited | Real estate | 2025 |
| Thrive Zone 8 Limited | Real estate | 2025 |
| Thrive Zone 9 Limited | Real estate | 2025 |
| Thrive Zone Limited | Real estate | 2024 |
| Thumbnail Productions Limited | Information & communication | 2006 |
| Tidal Business Solutions Limited | Professional & scientific | 2009 |
| Tiga Building Services Limited | Construction | 2012 |
| Tighten-Up Limited | Wholesale & retail | 1999 |
| Tilbay Limited | Real estate | 2013 |
| Tile City Limited | Wholesale & retail | 2011 |