| Teddington Management Limited | Households | 2000 |
| Teddington Photographic Limited | Professional & scientific | 2008 |
| Teddington Property Services (UK) Limited | Administrative & support | 2006 |
| Teddington Services Limited | Real estate | 2020 |
| Teddington Solutions Ltd | Real estate | 2011 |
| Teddington Sports Ltd | Wholesale & retail | 2012 |
| Teddington Stores Limited | Wholesale & retail | 2014 |
| Teddington Teeth Limited | Health & social care | 2021 |
| Teddington Together | Other services | 2018 |
| Teddington Tyre Centre Ltd | Wholesale & retail | 2026 |
| Teddington Tyres Limited | Wholesale & retail | 2000 |
| Teddington Wharf Holdings Limited | Households | 1999 |
| Teddol Ltd | Real estate | 2021 |
| Teddyeddy Ltd | Professional & scientific | 2023 |
| Tedestra Limited | Administrative & support | 2017 |
| Teide Events Ltd | Arts & recreation | 2023 |
| Telco Exchange Ltd | Information & communication | 2017 |
| Tennex Ltd | Professional & scientific | 2024 |
| Tennis for Teddington Limited | Real estate | 2021 |
| Terada Consulting Ltd | Information & communication | 2016 |
| Termhouse (Regina Court) Management Limited | Households | 1978 |
| Ternholm Capital Limited | Professional & scientific | 2021 |
| Terra Lighting Limited | Construction | 2019 |
| Terra Toda Ltd. | Wholesale & retail | 2016 |
| Thames Portfolio Management Ltd | Construction | 2019 |
| Thames Roofing Ltd | Construction | 2022 |
| Thamesview Estate Agents Limited | Extraterritorial | 2016 |
| That Process Safety GUY Ltd | Professional & scientific | 2026 |
| THE Active Data People Ltd | Information & communication | 2023 |
| THE Andrioni Company Ltd | Wholesale & retail | 2025 |
| THE Architects Gallery Limited | Wholesale & retail | 2009 |
| THE Atticus Coaching Partnership Limited | Professional & scientific | 2010 |
| THE Bedroom Company London Limited | Wholesale & retail | 2018 |
| THE British Entertainment History Project | Other services | 2016 |
| THE Burbank Residents Association Limited | Households | 1999 |
| THE Business ZOO Ltd | Arts & recreation | 2020 |
| THE Cinema Theatre Association | Other services | 2002 |
| THE Commodities Risk & Compliance Consultancy Ltd | Professional & scientific | 2021 |
| THE Conference Collective Limited | Professional & scientific | 2010 |
| THE Copy Cat Limited | Professional & scientific | 2012 |
| THE Cornish HEN Limited | Hospitality | 2014 |
| THE Craze Group Ltd | Extraterritorial | 2021 |
| THE Creative Artworker Ltd | Professional & scientific | 2018 |
| THE Cube Concept Limited | Administrative & support | 2008 |
| THE Cunning Woman Ltd | Manufacturing | 2025 |
| THE Drama HUT Limited | Education | 2005 |
| THE Dress Bridal Ltd | Wholesale & retail | 2016 |
| THE Ecoglow Group Ltd | Construction | 2017 |
| THE ED Management Services Limited | Households | 2026 |
| THE END House Limited | Real estate | 2016 |
| THE ETC. Collective LLP | | 2026 |
| THE Fallow Deer Limited | Hospitality | 2013 |
| THE Gallery (KEW) Limited | Real estate | 2024 |
| THE Happy Tenant Company Limited | Real estate | 2011 |
| THE HAT on a FOX Company Ltd | Professional & scientific | 2023 |
| THE Healthy Food Development Ltd | Wholesale & retail | 2012 |
| THE Holmesdale Meadows Conservation Association Limited | Real estate | 2018 |
| THE Investment Media Company Ltd | Information & communication | 2009 |
| THE Kingston Road Company Limited | Households | 2002 |
| THE League of Friends of Teddington Memorial Hospital | Health & social care | 2009 |
| THE Mchardy Collective Limited | Professional & scientific | 2013 |
| THE Mighty Fuel Limited | Professional & scientific | 2022 |
| THE Mind at Work Limited | Professional & scientific | 2004 |
| THE Moorings (Manor Road) Residents Association Limited | Households | 1998 |
| THE Natural Play Makeup Company Ltd | Manufacturing | 2018 |
| THE Office of the Family House of Tuel LLP | | 2025 |
| THE Offline Club London Ltd | Administrative & support | 2025 |
| THE Old Champagne Glass Company Ltd | Wholesale & retail | 2015 |
| THE Old Station Gardens Management Company Limited | Extraterritorial | 1997 |
| THE Outdoor Deck Co Ltd. | Construction | 1997 |
| THE Power of Words Ltd | Professional & scientific | 2020 |
| THE Production Bible Ltd | Information & communication | 2014 |
| THE Rapport Group Limited | Information & communication | 1993 |
| THE Real Sound Company Limited | Information & communication | 2009 |
| THE Red House Fund Limited | Health & social care | 1991 |
| THE Reference Library Ltd | Wholesale & retail | 2019 |
| THE Rockschool Trust Limited | Professional & scientific | 2000 |
| THE Skiff Club Trust | Other services | 1993 |
| THE Social Drinking Company Limited | Wholesale & retail | 2018 |
| THE Southwest London Gardener Limited | Administrative & support | 2019 |
| THE Specialist Audio Company Limited | Wholesale & retail | 1991 |
| THE Sunbed Association | Other services | 1995 |
| THE Tree Agency Limited | Professional & scientific | 2006 |
| THE Villiers Management Company Limited | Households | 2007 |
| THE Waldegrave Arms Cafe Ltd | Hospitality | 2018 |
| THE White House (Farnham) Property Ltd | Real estate | 2023 |
| THE Wisdom Experience Limited | Hospitality | 2008 |
| THE Work Psychologists Ltd | Professional & scientific | 2015 |
| THE Work Surgery Ltd | Administrative & support | 2014 |
| THE ZEN FOX Group Ltd | Wholesale & retail | 2024 |
| Thermology Health EBT Limited | Professional & scientific | 2024 |
| Thermology Health Ltd | Manufacturing | 2023 |
| Thiara Design & Build Ltd | Construction | 2025 |
| Thine CC Ltd | Professional & scientific | 2022 |
| Third Angle Consulting Limited | Professional & scientific | 2013 |
| Third EYE Holdings Ltd | Administrative & support | 2025 |
| Third EYE Studio Ltd | Information & communication | 2026 |
| Third Line Productions Limited | Information & communication | 2015 |
| Thirteen 31 Limited | Professional & scientific | 2017 |
| This IS Gravy Ltd | Professional & scientific | 2018 |