| T&K Currier Services Ltd | Transport & logistics | 2017 |
| T&M Cleaning Services MMV Limited | Other services | 2016 |
| T&N Consultants Ltd | Construction | 2023 |
| T&S Interiors Ltd | Construction | 2021 |
| T&T Legal Ltd | Professional & scientific | 2018 |
| T&T Management Ltd | Professional & scientific | 2018 |
| T-Cubed Services Limited | Information & communication | 2008 |
| T. Evans Construction Limited | Construction | 2013 |
| T.A.M. Computer Services Limited | Information & communication | 1995 |
| T.K.R. Project Solutions Ltd | Construction | 2011 |
| T.M. Delta Limited | Professional & scientific | 2013 |
| T.P.N Properties Ltd | Real estate | 2020 |
| T2 Projects Ltd. | Professional & scientific | 2002 |
| T2 Projects Subco Ltd | Professional & scientific | 2011 |
| TA London Property Investments Ltd | Real estate | 2024 |
| Taber Business and Financial Services Ltd | Professional & scientific | 2003 |
| Tabor Court (Cheam) Management Company Limited | Households | 1979 |
| Taco Food & Events Ltd | Hospitality | 2026 |
| Tadworth Tanning Ltd | Other services | 2018 |
| Tahir Pharma Ltd | Health & social care | 2018 |
| Taigh Construction Ltd | Real estate | 2025 |
| Tailored Carpentry and Design Limited | Manufacturing | 2024 |
| Tailored Group Enterprise Ltd | Other services | 2020 |
| Tailoring & Alterations Ltd | Professional & scientific | 2018 |
| Tajs Health Care Services Limited | Health & social care | 2018 |
| Takeoff (UK) Limited | Other services | 2010 |
| Talbot Park Developments Ltd | Construction | 2024 |
| Talendeur Limited | Information & communication | 2020 |
| Talent Central Ltd | Administrative & support | 2014 |
| Talent Quest Resources UK Ltd | Administrative & support | 2024 |
| Talha Trading Company Ltd | Hospitality | 2018 |
| Talisow Ltd | Manufacturing | 2025 |
| Tama Property Ltd | Construction | 2023 |
| Tambeth Limited | Financial services | 2018 |
| Tamerton Investments Limited | Administrative & support | 2005 |
| Tamils Health Organization - UK | Health & social care | 2003 |
| Tamilson Ltd | Wholesale & retail | 2023 |
| Tamopoint Limited | Wholesale & retail | 2020 |
| Tamu Homes Enterprises Limited | Financial services | 2020 |
| Tamu Homes Management Limited | Health & social care | 2020 |
| Tamu Homes SPV Ltd | Real estate | 2021 |
| Tamu Homes Supported Accommodation Ltd | Health & social care | 2021 |
| Tan-Gerine Tanning Ltd | Other services | 2025 |
| Tanadiwa Ltd | Public administration | 2023 |
| Tangerine Training Ltd | Health & social care | 2026 |
| Tangram Theatre Company Limited | Arts & recreation | 2007 |
| Tanishka Consulting Limited | Information & communication | 2011 |
| Tankerford Ltd | Wholesale & retail | 2006 |
| Tanzdar Properties Limited | Real estate | 2017 |
| TAP and Play Ltd | Wholesale & retail | 2025 |
| TAP Underwriting Ltd | Extraterritorial | 2022 |
| Taprobane Island Limited | Real estate | 2022 |
| Tarun Properties Ltd | Real estate | 2019 |
| Tash Property Services Limited | Administrative & support | 2022 |
| Tasty Cafe Cheam Limited | Hospitality | 2016 |
| Tasty Nation Ltd | Hospitality | 2024 |
| Tatireddy Limited | Real estate | 2024 |
| Tattah UK Limited | Information & communication | 2003 |
| Tattvam Limited | Information & communication | 2016 |
| Tavares Developments Ltd | Construction | 2025 |
| Tax Solution Accounting Ltd | Professional & scientific | 2025 |
| Taybour Properties Limited | Administrative & support | 2005 |
| Taylor & Chang Removals Ltd | Water & waste | 2026 |
| Taylor Harris Contracting Services Ltd | Wholesale & retail | 2021 |
| Taylor Made Homes London Limited | Construction | 2016 |
| Taylor Roadside & Recovery Limited | Wholesale & retail | 2024 |
| Taylor Ward Properties Ltd | Households | 2024 |
| TAZ Holdings Ltd | Manufacturing | 2022 |
| Tazmata Ltd | Construction | 2023 |
| TB2S Property Ltd | Real estate | 2023 |
| TBA Company Secretarial Limited | Extraterritorial | 1993 |
| TBE1 Racing Limited | Arts & recreation | 2023 |
| Tcbldn Ltd | Education | 2024 |
| TCR Barbers Ltd | Other services | 2021 |
| TD Couriers Limited | Transport & logistics | 2018 |
| Tdsk Limited | Real estate | 2022 |
| Teach ME HOW to BIZ Ltd | Administrative & support | 2017 |
| TEAK45 Ltd | Professional & scientific | 2024 |
| Teakunique Limited | Wholesale & retail | 2016 |
| Teal Hair Limited | Other services | 2016 |
| Team Orims Ltd | Administrative & support | 2015 |
| Tech & Toke Ltd | Wholesale & retail | 2024 |
| Tech Vicinity Ltd. | Information & communication | 2016 |
| Techities Ltd | Information & communication | 2026 |
| Techium Limited | Information & communication | 2022 |
| Techlaw Limited | Professional & scientific | 1997 |
| Techlogic IT Services Limited | Information & communication | 2014 |
| Techmedia (UK) Limited | Wholesale & retail | 2014 |
| Techno Axis Ltd | Information & communication | 2016 |
| Techno Trader Ltd. | Wholesale & retail | 2013 |
| Technoace Limited | Wholesale & retail | 2011 |
| Technology Transformers Ltd | Information & communication | 2026 |
| Techpool Digital Ltd | Information & communication | 2026 |
| Techpro DC Ltd. | Administrative & support | 2013 |
| Techy Kids Group Ltd | Education | 2018 |
| Techy Smart Holdings Ltd | Information & communication | 2018 |
| Techy Smart Ltd | Information & communication | 2014 |
| Tecky Academy UK Limited | Information & communication | 2020 |
| Tecrebel Ltd | Information & communication | 2021 |
| TED Liberty Ltd | Extraterritorial | 2015 |