| THE Outside Link Ltd | Education | 2020 |
| THE Phoenix Hub Ltd | Health & social care | 2018 |
| THE Plough on the Pond Limited | Hospitality | 2018 |
| THE Potters House Christian Church, Croydon | Other services | 2008 |
| THE Radiant Renovations Limited | Construction | 2026 |
| THE Sikh Consultancy Ltd | Professional & scientific | 2021 |
| THE Sikh Match Ltd | Administrative & support | 2023 |
| THE Sikh Watch Ltd | Manufacturing | 2025 |
| THE Silly Sausage Brand Ltd | Wholesale & retail | 2025 |
| THE Social Centre Ltd | Professional & scientific | 2023 |
| THE Social Work Race C.I.C. | Professional & scientific | 2025 |
| THE State of BIR Tawil Ltd | Mining & quarrying | 2021 |
| THE Stewart's GEM Ltd | Hospitality | 2025 |
| Thecusogroup Limited | Professional & scientific | 2026 |
| Thefullyfledgedgroup Ltd | Manufacturing | 2024 |
| Theo Porteous Holdings Ltd | Hospitality | 2024 |
| Therapylifeskills Ltd | Education | 2022 |
| Thines Properties Ltd | Real estate | 2018 |
| Think Globally Limited | Information & communication | 2023 |
| Thinqmotion Ltd | Manufacturing | 2025 |
| Thiru Estates Ltd | Real estate | 2021 |
| Thompson Consultancy Limited | Health & social care | 2021 |
| Thornton and Associates Ltd | Real estate | 2021 |
| Thornton Bespoke Design Limited | Manufacturing | 2021 |
| Thornton Day Nursery Ltd | Education | 2017 |
| Thornton Heath Business ASS and Community Ltd Ltd | Administrative & support | 2026 |
| Thornton Heath Cash and Carry Ltd | Wholesale & retail | 2025 |
| Thornton Heath Mews RTM Company Limited | Households | 2018 |
| Thornton Heath Noodles Ltd | Hospitality | 2022 |
| Thornton Kebab House Limited | Hospitality | 2018 |
| Thornton Lodge Limited | Health & social care | 2011 |
| Threetek Limited | Wholesale & retail | 2021 |
| Thunder Realtor Limited | Real estate | 2025 |
| TIC TAC Cars Ltd. | Transport & logistics | 2015 |
| Tickscribe Ltd | Administrative & support | 2018 |
| Tienran Ikuandao Association UK | Other services | 2023 |
| Tiger Tours (Europe) Limited | Administrative & support | 2012 |
| Timberchip Carpentry Ltd | Extraterritorial | 2022 |
| Timtex Estates Ltd | Real estate | 2022 |
| Tissy Ltd | Construction | 2022 |
| Tiwaire Limited | Health & social care | 2023 |
| TJ Fresh EGG Supplier Ltd | Wholesale & retail | 2012 |
| TJA Property Investments Ltd | Real estate | 2017 |
| TLC UK Healthcare Ltd | Administrative & support | 2022 |
| Tleisha Senior Ltd | Administrative & support | 2019 |
| Tlinx Limited | Construction | 2023 |
| TM House & Hostels Limited | Hospitality | 2014 |
| Tmbl Carpentry Limited | Construction | 2015 |
| TMD Vascular Ltd | Health & social care | 2026 |
| Tns.Croydon Limited | Wholesale & retail | 2026 |
| Tokyo Car Sales Ltd | Wholesale & retail | 2026 |
| Toll House Limited | Hospitality | 2025 |
| Tomi Ceiling Ltd | Construction | 2014 |
| Tomo Electrical Services Ltd | Construction | 2022 |
| Top Carers Nursing Agency Limited | Health & social care | 2004 |
| Topmeadowsproperty Ltd | Financial services | 2019 |
| Topspot Investing Limited | Real estate | 2021 |
| Topstone Solicitors Limited | Professional & scientific | 2015 |
| Topvolt Ltd | Construction | 2026 |
| Toro Builders Ltd | Construction | 2019 |
| Toros Tracks Limited | Construction | 2019 |
| Tortoise Shell Childcare Ltd | Health & social care | 2024 |
| Touristica UK Limited | Administrative & support | 2019 |
| Tournament Creative Ltd | Arts & recreation | 2024 |
| TPT Removals Ltd | Transport & logistics | 2022 |
| Trackout Records Limited | Arts & recreation | 2017 |
| Tradebloom Limited | Wholesale & retail | 2024 |
| Tradenest Group Limited | Wholesale & retail | 2026 |
| Tradenest Group Limited Ltd | Wholesale & retail | 2026 |
| Trader Deals Limited | Wholesale & retail | 2025 |
| Tradewinds Production Media Services Limited | Information & communication | 2022 |
| Transcom Haulage Limited | Transport & logistics | 2015 |
| Transformalytics Limited | Professional & scientific | 2022 |
| Transport Investment Solutions Limited | Professional & scientific | 2015 |
| Travelutions Global Ltd | Administrative & support | 2026 |
| Traverse Trees Limited | Administrative & support | 2018 |
| Trend Hunt Ltd | Information & communication | 2025 |
| Trevic Drylining Ltd | Construction | 2024 |
| Tricrest Consultants Ltd | Real estate | 2025 |
| Triple Scoop (Walworth) Limited | Hospitality | 2023 |
| Trishaan Ltd | Wholesale & retail | 2026 |
| Trkconstruction Ltd | Construction | 2026 |
| TROPIC68 Ltd | Hospitality | 2024 |
| TS Elite Commerce Ltd | Wholesale & retail | 2026 |
| TSM Cons Ltd | Construction | 2025 |
| TT Miraal Group Limited | Wholesale & retail | 2024 |
| TT Zaka Trading Ltd | Wholesale & retail | 2025 |
| TTG Traders Ltd | Wholesale & retail | 2018 |
| Tulshi IT Solutions Ltd | Information & communication | 2016 |
| Tumi Services Limited | Professional & scientific | 2024 |
| Turbo Consultant Ltd | Professional & scientific | 2026 |
| Turk Food 2027 Ltd | Wholesale & retail | 2026 |
| Turning Point Education Limited | Education | 2009 |
| Turning Point Health Ltd | Health & social care | 2012 |
| Turo IT Services Ltd | Information & communication | 2018 |
| Tusana Ltd | Hospitality | 2025 |
| Tusuubira Ltd | Health & social care | 2025 |
| Tutto Pizzaria Limited | Hospitality | 2021 |
| TVK Food and Wine Limited | Wholesale & retail | 2025 |
| TVP Ventures Ltd | Information & communication | 2018 |