| Teddington Grange Management Limited | Households | 1969 |
| Teeny Tiny Tales Ltd | Arts & recreation | 2021 |
| Tehnotreid Construction Ltd | Construction | 2025 |
| Teqrise Ltd | Information & communication | 2018 |
| Terra Lettings Ltd | Real estate | 2026 |
| Tersoworks Ltd | Administrative & support | 2026 |
| Test Management Consultancy Limited | Information & communication | 2010 |
| Textainer Equipment Management (U.K.) Limited | Transport & logistics | 1987 |
| Tezda Ltd | Wholesale & retail | 2023 |
| Thamarai Jewellery Ltd | Wholesale & retail | 2026 |
| THE Aesthetic & Wellness Clinic Ltd. | Health & social care | 2018 |
| THE Archbishop Tenison's School Sports Ground | Arts & recreation | 1924 |
| THE Bless Nail & Beauty Ltd | Other services | 2024 |
| THE Bulmin House Ltd | Real estate | 2021 |
| THE Cascades (Hartfield Crescent) Management Limited | Households | 1999 |
| THE Cherry Orchard Group Limited | Real estate | 2022 |
| THE Christmas Angels Ltd | Wholesale & retail | 2023 |
| THE Community Investment Fund L.P. | | 2014 |
| THE Content Production Department Ltd | Manufacturing | 2026 |
| THE Courtyard (Meanwood) Management Company Limited | Households | 2007 |
| THE Creative Fact Limited | Administrative & support | 2008 |
| THE Denes (HAM) Management Company Limited | Households | 2007 |
| THE Design Concept Ltd | Professional & scientific | 2020 |
| THE DRY Run Ltd | Information & communication | 2026 |
| THE Emerald Collective Ltd | Manufacturing | 2024 |
| THE Espresso Yard Ltd | Hospitality | 2025 |
| THE Euro Journal Ltd | Information & communication | 2003 |
| THE Face Line International Limited | Professional & scientific | 2016 |
| THE Foundry International Ltd | Professional & scientific | 2019 |
| THE Fountain Dental Practice Limited | Health & social care | 2024 |
| THE Fountain New Malden Ltd. | Hospitality | 2026 |
| THE Geminiani Project Ltd | Arts & recreation | 2014 |
| THE Gentry Barbering Company Ltd | Other services | 2023 |
| THE Grand Agency Ltd | Real estate | 2024 |
| THE Grove Twickenham Ltd | Households | 2003 |
| THE Groves Plumbing and Heating Ltd | Construction | 2022 |
| THE Hair Helper Ltd | Wholesale & retail | 2015 |
| THE Headshot Pro Ltd | Professional & scientific | 2022 |
| THE Holy Cross School | Education | 2012 |
| THE Horse Limited | Wholesale & retail | 2026 |
| THE Humble Noodle Group Ltd | Administrative & support | 2020 |
| THE Iinlife Limited | Information & communication | 2009 |
| THE Innovation Management Society Ltd | Other services | 2025 |
| THE International Solicitors Limited | Professional & scientific | 2017 |
| THE Inventing Room Limited | Professional & scientific | 2024 |
| THE Korean Church London | Other services | 2014 |
| THE Laser and Aesthetics Clinic Limited | Other services | 2024 |
| THE Launderette Around the Corner Limited | Other services | 2024 |
| THE Life Content Ltd | Other services | 2025 |
| THE Lighthouse Church - New Malden | Other services | 2012 |
| THE Malden Store Ltd | Wholesale & retail | 2023 |
| THE Maltings 1 Management Company (Isleworth) Limited | Households | 1994 |
| THE Maltings 2 Management Company (Isleworth) Limited | Households | 1994 |
| THE Medinge Foundation Limited | Professional & scientific | 2008 |
| THE Mews Melrose Gardens Limited | Households | 2015 |
| THE Moonbug Collective Ltd | Wholesale & retail | 2020 |
| THE Old Dairy (Streatham) Management Company Limited | Households | 2013 |
| THE Physio Experience Ltd | Health & social care | 2006 |
| THE Polish Deli London Ltd | Hospitality | 2012 |
| THE Polish Deli Market Ltd | Wholesale & retail | 2024 |
| THE Recharge Clinic Ltd | Wholesale & retail | 2024 |
| THE RM2 EOT Limited | Administrative & support | 2019 |
| THE RM2 Partnership Limited | Extraterritorial | 2025 |
| THE Savvy Corporation Ltd | Financial services | 2021 |
| THE Shuttle SOC Ltd | Wholesale & retail | 2026 |
| THE Sportess Limited | Professional & scientific | 2025 |
| THE Sports Marketing Consultancy Limited | Administrative & support | 2013 |
| THE Stewartry Management Company Limited | Households | 1987 |
| THE Surrey Milling Centre Limited | Health & social care | 2007 |
| THE Surrey Wood Flooring Co. Ltd. | Construction | 2004 |
| THE Szilvay Foundation | Education | 1997 |
| THE Thames Academy Ltd | Education | 2020 |
| THE Third Sector Investment Fund LLP | | 2014 |
| THE Togethr Project Ltd | Information & communication | 2021 |
| THE Wallpaper Hangers Ltd | Construction | 2011 |
| THE White House Nursing Home Limited | Health & social care | 2014 |
| THE Wonderful Wizard of Dogs Ltd | Other services | 2025 |
| Thebadeggslimited Ltd | Arts & recreation | 2025 |
| Thenon Holdings Limited | Information & communication | 1992 |
| Things Change Ltd | Information & communication | 2026 |
| Thivyaa Engineering Ltd | Construction | 2005 |
| Thomas LEE Media Ltd | Information & communication | 2015 |
| Thorn & Thunder Limited | Wholesale & retail | 2024 |
| Thortune Ltd | Financial services | 2018 |
| Three Parks Development Limited | Construction | 2016 |
| Thrive Recruitment Ltd | Administrative & support | 2026 |
| Thunder Lane Garage,Limited | Wholesale & retail | 1957 |
| Thurkas Ltd | Wholesale & retail | 2017 |
| Thurkas Property Ltd | Real estate | 2024 |
| Tiari Food Exports Ltd | Wholesale & retail | 2024 |
| Ticketfair Ltd | Information & communication | 2025 |
| Tickstack Limited | Information & communication | 2025 |
| Tigris Autos Ltd | Wholesale & retail | 2025 |
| Tilly Ramsay Ltd | Administrative & support | 2021 |
| Time Tour Limited | Transport & logistics | 2007 |
| Times Court Limited | Households | 1992 |
| Tintmate Ltd | Wholesale & retail | 2025 |
| Tiptour Limited | Administrative & support | 2016 |
| Tiro App Ltd | Information & communication | 2018 |
| TMC Support Services Limited | Professional & scientific | 2013 |