| Top Choice Trade Ltd. | Wholesale & retail | 2021 |
| Top Cladding Services Limited | Construction | 2020 |
| Top Class Building Services Limited | Construction | 1997 |
| Top Class Maintenance Services Ltd | Construction | 2025 |
| Top Decorating Ltd | Construction | 2025 |
| Top Event Production Ltd | Hospitality | 2026 |
| Top Events Security UK Ltd | Administrative & support | 2024 |
| Top G Garments Ltd | Manufacturing | 2025 |
| Top Grade Tutors Limited | Education | 2024 |
| Top Handyman Services Ltd | Construction | 2023 |
| Top Horizon Services Ltd | Education | 2020 |
| Top London Construction Ltd | Construction | 2011 |
| Top Mark Centre Limited | Education | 2024 |
| Top Marketing International Ltd | Wholesale & retail | 2022 |
| Top Nails 362 Ltd | Other services | 2025 |
| Top R Ltd | Wholesale & retail | 2022 |
| Top Rayson Barbers 2 Ltd | Other services | 2025 |
| Top Rent Ltd | Real estate | 2019 |
| Top Residentials Ltd | Real estate | 2022 |
| Top Score Limited | Professional & scientific | 2002 |
| Top Security & FM Ltd | Administrative & support | 2020 |
| Top Shelf Solutions Ltd | Information & communication | 2023 |
| Top Tier Marketing Ltd | Professional & scientific | 2025 |
| Top Tier Shop Ltd | Wholesale & retail | 2025 |
| Top to Bottom Cleaning Ltd | Administrative & support | 2019 |
| Top Travel UK Limited | Administrative & support | 2008 |
| Topaas Limited | Wholesale & retail | 2017 |
| Topaz Education Services Ltd | Education | 2019 |
| Topaz Textiles Ltd | Real estate | 2015 |
| Topbe Group Ltd | Real estate | 2015 |
| Topboost Ltd | Wholesale & retail | 2024 |
| Topcatdiamond International Limited | Wholesale & retail | 2013 |
| Topforce Solutions Ltd | Professional & scientific | 2026 |
| Toplevel Services Limited | Real estate | 1993 |
| Topline Business Limited | Wholesale & retail | 2019 |
| Topps Building Contractors Limited | Construction | 2025 |
| Toptrade Building Ltd | Construction | 2014 |
| Topup Plaza PTY Ltd | Wholesale & retail | 2016 |
| Topupcocktails Ltd | Manufacturing | 2021 |
| TOR Nexari Limited | Wholesale & retail | 2025 |
| Torgate Limited | Construction | 2007 |
| Torino Express Ltd | Hospitality | 2017 |
| Torkham Ltd | Wholesale & retail | 2025 |
| Torkoscar UK Ltd | Wholesale & retail | 2019 |
| Torku Limited | Hospitality | 2024 |
| Toro Carpentry Limited | Manufacturing | 2013 |
| Toronto Residence Limited | Real estate | 2015 |
| Torquatus Ltd | Information & communication | 2014 |
| Torque Partz Limited | Wholesale & retail | 2012 |
| Torrington Burton Limited | Information & communication | 2023 |
| Torrington Law Ltd | Professional & scientific | 2017 |
| Tortured & Electrix Recordings Ltd | Information & communication | 2012 |
| Torum Ltd | Professional & scientific | 2026 |
| Torus Yantra Ltd | Information & communication | 2025 |
| Toska Booking.Com Limited | Administrative & support | 2025 |
| Toska Construction Ltd | Construction | 2013 |
| Total Kooling Limited | Energy | 2012 |
| Total Office Solutions Ltd | Wholesale & retail | 2025 |
| Total Solution London Ltd | Wholesale & retail | 2025 |
| Total Transport & Care Ltd | Transport & logistics | 2023 |
| Totalwholesale Ltd | Wholesale & retail | 2026 |
| Totezilla Ltd | Wholesale & retail | 2026 |
| Toti Garage Ltd | Wholesale & retail | 2025 |
| Toto & Co. Ltd | Transport & logistics | 2025 |
| Toto Limited | Construction | 2020 |
| Tots and Tweenies Limited | Education | 2019 |
| Tottie Holdings Limited | Financial services | 2021 |
| Totu Global Limited | Wholesale & retail | 2025 |
| Toucan Roofing Limited | Construction | 2023 |
| Touch Gloves Boxing Limited | Other services | 2019 |
| Touching Lives Ltd | Extraterritorial | 2016 |
| Touching Social Care Limited | Health & social care | 2014 |
| Touchwood KB Ltd | Manufacturing | 2017 |
| Toun Investments Ltd | Real estate | 2022 |
| Tourilux Ltd | Administrative & support | 2025 |
| Tourspot Limited | Real estate | 2024 |
| Tova Cleaning Ltd | Administrative & support | 2025 |
| Tower Beacon House Limited | Real estate | 2023 |
| Tower Bridge Cafe Ltd | Hospitality | 2024 |
| Tower Hamlets Carers Organisation Ltd | Health & social care | 2022 |
| Tower Optical Ltd | Other services | 2019 |
| Town & Country Finance Ltd | Professional & scientific | 2003 |
| Town and County Valuers and Surveyors Ltd | Professional & scientific | 2017 |
| Town and Style Limited | Extraterritorial | 2015 |
| Town and Village Developments Limited | Professional & scientific | 1987 |
| Town Gadgets Ltd | Wholesale & retail | 2021 |
| Town Shop Retail Ltd | Wholesale & retail | 2015 |
| Towning Wholesale & Distribution Limited | Wholesale & retail | 1999 |
| Townsend Hotels Limited | Hospitality | 1992 |
| Toys Master Ltd | Wholesale & retail | 2020 |
| Toytropolis Ltd | Wholesale & retail | 2025 |
| Tozkar Limited | Other services | 2019 |
| TP Estates London Ltd | Real estate | 2020 |
| TP Gold Cleaning Ltd | Administrative & support | 2024 |
| TP Productions Limited | Administrative & support | 2015 |
| Tpbg Management Services Ltd | Administrative & support | 2025 |
| TPE Services Ltd | Construction | 2016 |
| TPL Media and Entertainment Ltd | Information & communication | 2026 |
| TPO Services Ltd | Information & communication | 2025 |
| Tppg Ltd | Construction | 2017 |