| THE Sush Ltd | Hospitality | 2023 |
| THE T Tiger T Ltd | Hospitality | 2026 |
| THE Toiletry Company Ltd | Manufacturing | 2024 |
| THE Urban Barber Ltd | Other services | 2024 |
| THE USF Ltd | Wholesale & retail | 2025 |
| THE Village Patisserie Ltd | Hospitality | 2016 |
| THE Warefield Engineering Limited | Wholesale & retail | 2010 |
| THE Wedding Star Ltd | Professional & scientific | 2026 |
| THE WET Waste Company Ltd | Extraterritorial | 2015 |
| THE WOK Restaurant Limited | Hospitality | 2019 |
| THE Young Scientist Ltd | Education | 2015 |
| THE Æura Ltd | Wholesale & retail | 2026 |
| THE3MIND Ltd | Wholesale & retail | 2020 |
| Thebeanlab Ltd | Wholesale & retail | 2023 |
| Thecorporateathlete Ltd | Health & social care | 2022 |
| Thedigitalmediaco Ltd | Information & communication | 2024 |
| Thegeneralstore Ltd | Wholesale & retail | 2022 |
| Theknitcorner Limited | Wholesale & retail | 2025 |
| Thelearntree Ltd | Wholesale & retail | 2026 |
| Thelna FM Limited | Administrative & support | 2023 |
| Thephysiocentre Ltd | Health & social care | 2010 |
| Theracups Limited | Health & social care | 2020 |
| Thiago Teaches Ltd | Education | 2026 |
| Thind Capital Ltd | Financial services | 2025 |
| Thind Courier Limited | Transport & logistics | 2015 |
| Thind Investors Limited | Real estate | 2020 |
| Thind Music UK Ltd | Information & communication | 2020 |
| Thind Property Ltd | Real estate | 2019 |
| Think Funiture Limited | Wholesale & retail | 2026 |
| Think Healthtech Limited | Professional & scientific | 2025 |
| Thinkbigrec Ltd | Administrative & support | 2024 |
| Third Diary Ltd | Wholesale & retail | 2026 |
| Third EYE Investments Limited | Real estate | 2020 |
| Thirsty Panda Ltd | Hospitality | 2021 |
| Thiyagarasa Enterprises Ltd | Wholesale & retail | 2024 |
| Thomas Adverts Limited | Professional & scientific | 2025 |
| Thomas Stroud Limited | Information & communication | 2017 |
| Thornby Property Investments Limited | Real estate | 2020 |
| Threadlooks Limited | Construction | 2025 |
| Threat Evolution Limited | Information & communication | 2017 |
| Three Ace Investment Limited | Real estate | 2023 |
| Three Sisters Limited | Hospitality | 2021 |
| Three Strawberry Group Ltd | Wholesale & retail | 2024 |
| Thrils United Limited | Administrative & support | 2025 |
| Thrust Ltd | Real estate | 2024 |
| Thryvian Ltd | Wholesale & retail | 2025 |
| THS Investments Ltd | Professional & scientific | 2021 |
| Thusi Wholesale Ltd | Wholesale & retail | 2019 |
| Thyaas Limited | Information & communication | 2022 |
| TI (Technology Innovators) Limited | Information & communication | 2006 |
| TID Services Limited | Transport & logistics | 2022 |
| Tiddles Property Consultants Limited | Real estate | 2022 |
| Tidymania Ltd | Administrative & support | 2024 |
| Tier 1 Commerce Ltd | Wholesale & retail | 2026 |
| Tifon Ltd | Real estate | 2016 |
| Tigersense Ltd | Information & communication | 2010 |
| Tigris Logistics Ltd | Transport & logistics | 2020 |
| Tikitaca Futsal Ltd | Arts & recreation | 2023 |
| Tikka Talk Limited | Hospitality | 2026 |
| Tiles & Mosaic Co Limited | Wholesale & retail | 2005 |
| Tillo Limited | Construction | 2025 |
| Time 4 Tiling Ltd | Construction | 2023 |
| Time and Space Media Limited | Professional & scientific | 2017 |
| Time Art Private Ltd | Wholesale & retail | 2016 |
| Time Precision Engineering Ltd | Construction | 2011 |
| Times Global Courier Services Ltd | Transport & logistics | 2025 |
| Tinos Medical Ltd | Health & social care | 2011 |
| Tiny Angels Day Nursery Ltd | Education | 2026 |
| TIP Top Garments UK Limited | Wholesale & retail | 2025 |
| Tirmas Limited | Wholesale & retail | 2018 |
| Tirmizi Labs Ltd | Information & communication | 2026 |
| Titan Core Ltd | Administrative & support | 2026 |
| Titan Developments London Ltd | Wholesale & retail | 2019 |
| Titan UK Trading Limited | Wholesale & retail | 2025 |
| Tiwp Catering and Events Ltd | Hospitality | 2023 |
| TJ Screeding Ltd | Construction | 2026 |
| TJ Vapes Ltd | Wholesale & retail | 2026 |
| Tjap Ltd | Wholesale & retail | 2025 |
| Tjgproperty Limited | Real estate | 2025 |
| TJS Investors Limited | Real estate | 2025 |
| TJT Investment Ltd | Real estate | 2026 |
| TKO Holdings Ltd | Construction | 2024 |
| TLC Laser Hounslow Limited | Other services | 2024 |
| TLC Signs Limited | Transport & logistics | 2003 |
| Tlsc (London) Ltd | Construction | 2022 |
| Tlsc (South) Limited | Construction | 2025 |
| Tlsc ACT 1 Ltd | Construction | 2026 |
| TM Site Management Ltd | Construction | 2017 |
| TMT Axios Ltd | Construction | 2015 |
| TNF Property Management Ltd | Construction | 2021 |
| Tobin Consultancy Limited | Other services | 2018 |
| Today's Boutique Limited | Wholesale & retail | 2002 |
| Toflan Trading Limited | Wholesale & retail | 2019 |
| Tolga Dates Ltd | Wholesale & retail | 2022 |
| Toltal Care at Home Limited | Health & social care | 2020 |
| TOM Sports Ltd | Wholesale & retail | 2019 |
| Tom's Pro Comms Techniques Ltd | Information & communication | 2016 |
| Tomdarin Ltd | Information & communication | 2022 |
| Tommy Builders Limited | Construction | 2014 |
| Tomnet Ltd | Administrative & support | 2016 |