| Toolstore Direct Limited | Wholesale & retail | 2024 |
| Toor Plumbing & Heating Ltd | Construction | 2018 |
| Tooting Fast Food Ltd | Hospitality | 2021 |
| Top Bites Ltd | Hospitality | 2026 |
| Top Choice Roofing Limited | Construction | 2020 |
| Top Class Courier Ltd | Transport & logistics | 2026 |
| Top END Design & Build Ltd | Construction | 2019 |
| Top END Properties Ltd | Real estate | 2024 |
| Top Horizon Limited | Education | 2016 |
| Top K Construction and Design Ltd | Construction | 2021 |
| Top Marqs Ltd | Hospitality | 2018 |
| Top of the Line Ltd | Other services | 2023 |
| Top Tier Design and Build Ltd | Construction | 2026 |
| Top Tier Training Ltd | Administrative & support | 2020 |
| Top to Bottom Homes Ltd | Construction | 2021 |
| Top Transportation Limited | Transport & logistics | 2026 |
| Top Tyres Mobile Services Ltd | Manufacturing | 2020 |
| Top-R Solutions Limited | Construction | 2021 |
| Topalov Development Ltd | Construction | 2023 |
| Topaz House Limited | Real estate | 2017 |
| Tophustler Ltd | Wholesale & retail | 2026 |
| Topline Home Rentals Ltd | Real estate | 2026 |
| Topshopweb Ltd | Wholesale & retail | 2016 |
| Toren Ltd | Wholesale & retail | 2023 |
| Torquewise Limited | Information & communication | 2021 |
| Total Building Solutions London Ltd | Construction | 2021 |
| Total Catering REC Limited | Hospitality | 2014 |
| Total Transport Team Ltd | Transport & logistics | 2025 |
| Totaledge Solutions Limited | Construction | 2025 |
| Totally Chauffeur Ltd | Other services | 2013 |
| Touch of Vogue Ltd | Wholesale & retail | 2018 |
| Touch Stone Roadlines Ltd | Manufacturing | 2019 |
| Touchnet Global Limited | Information & communication | 2024 |
| Tour Travel Village Ltd | Administrative & support | 2025 |
| Tower Window Cleaning Limited | Administrative & support | 2009 |
| Towers Associates Ltd | Professional & scientific | 2022 |
| Towerwell Developers Ltd | Construction | 2013 |
| Town Fresh Fish Ltd | Wholesale & retail | 2025 |
| Town Tea Cafe Ltd | Hospitality | 2024 |
| Toys and Gifts (Wembley) Limited | Wholesale & retail | 2016 |
| TPD Properties London Limited | Real estate | 2024 |
| TPH Car Hire Ltd | Administrative & support | 2019 |
| TR Properties Investment Ltd | Real estate | 2021 |
| TRA Trans Ltd | Transport & logistics | 2018 |
| TRA Tree Works Limited | Agriculture & fishing | 2023 |
| Trade 2 Green Ltd | Wholesale & retail | 2017 |
| Trade Aftermarket Limited | Wholesale & retail | 2017 |
| Trade Route Couriers Ltd | Transport & logistics | 2025 |
| Tradebase AI Limited | Information & communication | 2026 |
| Traditions Catering Ltd | Hospitality | 2018 |
| Trail Travels Ltd | Administrative & support | 2024 |
| Training & Recruitment Link Ltd | Health & social care | 2020 |
| Tranquil Wellness Ltd | Public administration | 2024 |
| Trans Poldek Ltd | Administrative & support | 2017 |
| Transfer &Turismo Londres Ltd | Administrative & support | 2015 |
| Transflow Energy Limited | Information & communication | 2026 |
| Transhomes UK Ltd | Construction | 2017 |
| Transport Titans Ltd | Transport & logistics | 2025 |
| Traveldom Ltd | Administrative & support | 2024 |
| Travis Builders Ltd | Construction | 2018 |
| Travis Magazine Limited | Information & communication | 2023 |
| Travolgo 360 Ltd | Administrative & support | 2025 |
| TRB Transport Limited | Transport & logistics | 2019 |
| Treat & Care Aesthetics Ltd | Other services | 2023 |
| Treewood Ltd | Construction | 2004 |
| Trend Fushions Ltd | Wholesale & retail | 2025 |
| Trend Lovers Ltd | Wholesale & retail | 2025 |
| Trend&Link Limited | Wholesale & retail | 2025 |
| Trendcraft Ltd | Wholesale & retail | 2025 |
| Trends by Hayyah Ltd | Wholesale & retail | 2025 |
| Trendz Sportsware Ltd | Wholesale & retail | 2021 |
| Trensec Ltd | Construction | 2021 |
| Trestelle Ltd | Information & communication | 2023 |
| Trevell Archer Ltd | Construction | 2026 |
| TRG Constructions Ltd | Construction | 2019 |
| Tribal Trinkets Ltd | Manufacturing | 2024 |
| Tribuyus Limited | Wholesale & retail | 2025 |
| Tricore Investments Limited | Construction | 2025 |
| Tridev Trading Ltd | Wholesale & retail | 2025 |
| Trifloor Limited | Wholesale & retail | 2017 |
| Trimex Food & Wine Ltd | Wholesale & retail | 2012 |
| Trimurti Investments Ltd | Real estate | 2023 |
| Trinetra Homes Limited | Real estate | 2025 |
| Trinity & Divine Limited | Real estate | 2024 |
| Trinity 12 Limited | Real estate | 2015 |
| Trinity ‘a’ Services Ltd | Administrative & support | 2025 |
| Trion Technology Ltd | Wholesale & retail | 2021 |
| Trip Line Transport Ltd | Transport & logistics | 2025 |
| Triplast Limited | Manufacturing | 2016 |
| Triple a Express Limited | Transport & logistics | 1997 |
| Triple C Care Ltd | Health & social care | 2021 |
| Triple C Home Support Limited | Health & social care | 2026 |
| Triple Clean & Co Ltd | Administrative & support | 2025 |
| Triple H Express Ltd | Transport & logistics | 2026 |
| Triple ZEE Consultancy Ltd | Information & communication | 2024 |
| Tripple H Properties Ltd | Real estate | 2025 |
| Tripple M Group Ltd | Financial services | 2024 |
| Trishaangroup PVT Ltd | Wholesale & retail | 2025 |
| Trishuli Cash and Carry Limited | Wholesale & retail | 2024 |
| Trivoxa Ltd | Wholesale & retail | 2026 |