| Tilt Road (Cobham) Management Company Limited | Households | 2005 |
| TIM and Danny Music Ltd | Information & communication | 2009 |
| TIM Bidco 1 Limited | Other services | 2017 |
| TIM Holdco Limited | Other services | 2017 |
| TIM Midco Limited | Other services | 2017 |
| TIN & TIK Company Limited | Real estate | 2024 |
| Tintagel House Residents Association Limited | Households | 1975 |
| Tiong Limited | Professional & scientific | 2023 |
| Tiptop View Ltd | Health & social care | 2022 |
| Titan Windows and Removal Ltd | Transport & logistics | 2025 |
| Tivet Holdings Limited | Professional & scientific | 2013 |
| TJ Accountancy Services London Ltd | Professional & scientific | 2024 |
| TJN Management Limited | Construction | 2018 |
| TM Bytes Limited | Wholesale & retail | 2016 |
| TML Venture Limited | Professional & scientific | 2017 |
| TMT2 Consultancy Ltd | Professional & scientific | 2024 |
| TN London Ltd | Construction | 2026 |
| Tocho Ltd | Wholesale & retail | 2025 |
| Todorov Ltd | Transport & logistics | 2026 |
| Together Equal Ltd | Education | 2018 |
| Toladimeji Ltd | Professional & scientific | 2018 |
| Tollworth Foods Limited | Hospitality | 2020 |
| Tolworth Associates Ltd | Hospitality | 2019 |
| Tolworth Broadway Barbers Ltd | Other services | 2010 |
| Tolworth Construction Limited | Construction | 2017 |
| Tolworth Girls' School and Sixth Form | Education | 2011 |
| Tolworth Management Company Ltd. | Real estate | 1992 |
| Tolworth Roofing Ltd | Construction | 2020 |
| TOM Brown Visual Limited | Information & communication | 2019 |
| TOM Clayton Fitness Ltd | Arts & recreation | 2020 |
| Tomandsteve Limited | Information & communication | 2013 |
| Tommy Studio Ltd | Wholesale & retail | 2026 |
| Tone the Trader Ltd | Wholesale & retail | 2026 |
| Tonerlux Ltd | Transport & logistics | 2021 |
| Tony Cars Ltd | Transport & logistics | 2019 |
| Tooth Crew Ltd | Health & social care | 2022 |
| Top Cat Artists Limited | Other services | 2011 |
| Top COD Limited | Hospitality | 2021 |
| Top GAS Plumbing & Heating Limited | Construction | 2023 |
| Top Munro Ltd | Wholesale & retail | 2016 |
| Topaccolades Limited | Information & communication | 2001 |
| Topaz Music Distribution Ltd | Information & communication | 2025 |
| Toplexus Ltd | Professional & scientific | 2018 |
| Topsite Limited | Real estate | 2000 |
| Torus Investments Limited | Real estate | 2023 |
| Total Accounting Consultancy Limited | Professional & scientific | 2013 |
| Totam Ltd | Professional & scientific | 2021 |
| Tots Ltd | Information & communication | 1995 |
| Toutlemonde Design LLP | | 2004 |
| Tower Bridge Empathy Ltd | Professional & scientific | 2021 |
| Town Cafe Limited | Hospitality | 2014 |
| Townsend Engineering Services Limited | Manufacturing | 2018 |
| TQM Insights Limited | Real estate | 2021 |
| Traccio Ltd | Information & communication | 2025 |
| Traceadebt Limited | Administrative & support | 2016 |
| Traction Europe Limited | Transport & logistics | 2013 |
| Trad Consult Limited | Professional & scientific | 2018 |
| Trade and Lateral Development Ltd | Information & communication | 2024 |
| Trade Hunter Group Ltd | Administrative & support | 2024 |
| Tradeksing Ltd | Administrative & support | 2026 |
| Traders Cash and Carry Limited | Real estate | 2021 |
| Traders Coffee Limited | Wholesale & retail | 2002 |
| Traders Coffeebay Trustee Limited | Professional & scientific | 2022 |
| Tradewinds Coffee Merchants Limited | Wholesale & retail | 2016 |
| Trailblaze Managed Services Ltd | Real estate | 2019 |
| Train Right for YOU Ltd | Arts & recreation | 2018 |
| Tralia Ltd | Information & communication | 2009 |
| Transition Management Consultancy Ltd | Professional & scientific | 2022 |
| Transmission (TX) Limited | Arts & recreation | 1988 |
| Travel Class Limited | Administrative & support | 1994 |
| Travel Magic Limited | Administrative & support | 2010 |
| Travelbound European Tours Limited | Other services | 1992 |
| Travelbug Properties Limited | Real estate | 2010 |
| Travelopia Adventure Limited | Professional & scientific | 1985 |
| Travelopia Central Operations Limited | Administrative & support | 2017 |
| Travelopia Group Holdings Limited | Other services | 2017 |
| Travelopia Holdings Limited | Administrative & support | 2006 |
| Travelsure Limited | Transport & logistics | 2010 |
| Treasure Kave Ltd | Wholesale & retail | 2020 |
| Trek Investco Limited | Administrative & support | 1999 |
| Trenton Consulting Limited | Hospitality | 2017 |
| Trigan Consulting Limited | Professional & scientific | 2016 |
| Trikidoo Ltd | Construction | 2022 |
| Trimax Investments Ltd | Real estate | 2003 |
| Tring Court Residents (Twickenham) Limited | Households | 1971 |
| Trinity Properties and Investments Limited | Real estate | 2021 |
| Trip Trove Ltd | Administrative & support | 2024 |
| Triple Point PVT Ltd | Information & communication | 2025 |
| TRU Wave Studios Ltd | Information & communication | 2026 |
| Truetoyou Aesthetics Ltd | Other services | 2024 |
| Truong Bubble Tea Limited | Hospitality | 2023 |
| Trust a Business Limited | Professional & scientific | 2014 |
| Truthwell Ltd. | Wholesale & retail | 2022 |
| Trym Couriers Ltd | Transport & logistics | 2018 |
| Trymf Ltd | Professional & scientific | 2026 |
| Tsach Ltd | Professional & scientific | 2021 |
| Tsanev 81 Ltd | Other services | 2012 |
| TSM London Limited | Manufacturing | 2021 |
| Tt-Pro Sports Ltd | Administrative & support | 2025 |
| TTD Communications Limited | Professional & scientific | 2015 |