| Thesos Limited | Manufacturing | 2026 |
| Thetford Carwash Ltd | Administrative & support | 2024 |
| Thetford Road Ltd | Construction | 2019 |
| Thevisualchef Ltd | Professional & scientific | 2024 |
| They DO PR Ltd | Professional & scientific | 2018 |
| Thiara Hotel Ltd | Real estate | 2023 |
| Thin-Possible Ltd | Hospitality | 2020 |
| Thind M B Builder Ltd | Construction | 2019 |
| Thind Mann Limited | Real estate | 2023 |
| Think Carbon Ltd | Transport & logistics | 2021 |
| Thinkcreativ Limited | Information & communication | 2017 |
| Thirkettle Scaffolding Limited | Construction | 2025 |
| Thirty Five Park Place Limited | Real estate | 2020 |
| This Girl's Ability CIC | Other services | 2022 |
| Thistle Windows (Essex) Limited | Construction | 2001 |
| Thmh Ltd | Construction | 2023 |
| Thomas Bates & SON Limited | Real estate | 1927 |
| Thomas Hardy & Partners Limited | Professional & scientific | 2009 |
| Thomas Michaels Group Ltd | Wholesale & retail | 2022 |
| Thomas Road Investments Ltd | Real estate | 2024 |
| Thomas&Co Ltd. | Real estate | 2018 |
| Thompsons Construction Ltd | Construction | 2023 |
| Thomson PSV & HGV Services Ltd | Wholesale & retail | 2025 |
| Thor Property Management Limited | Administrative & support | 2013 |
| Thoroughly Modern Media Limited | Information & communication | 2013 |
| Thread Two Ventures Limited | Professional & scientific | 2024 |
| Threadnwax Limited | Other services | 2020 |
| Threads and SEW Company Ltd | Wholesale & retail | 2024 |
| Three Angel Health Care Ltd | Public administration | 2018 |
| Three Lions Shopfront Ltd | Manufacturing | 2022 |
| Threeangles Ltd. | Health & social care | 2011 |
| Threefold Films Limited | Information & communication | 2012 |
| Threefold Services Limited | Construction | 2018 |
| Threepeat Ltd | Transport & logistics | 2025 |
| Thrive Bridge Initiative CIC | Health & social care | 2023 |
| Thrive Bridge Mental Wellness CIC | Health & social care | 2026 |
| Thrive Facility Management Ltd | Construction | 2024 |
| Thrive SP Ltd | Education | 2026 |
| Throne Food Ltd | Hospitality | 2026 |
| Thunderbolt (London) Limited | Wholesale & retail | 2009 |
| Thurible Consulting Ltd | Information & communication | 2026 |
| THZ Services Limited | Professional & scientific | 2023 |
| TIA Blenman Ltd | Real estate | 2025 |
| Tiago Commercial Storage Ltd | Wholesale & retail | 2022 |
| Tianyuan Hair (UK) Ltd | Wholesale & retail | 2014 |
| TIB Electrical Ltd | Construction | 2020 |
| Tibaff Limited | Health & social care | 2026 |
| Tick Tock and Co London Limited | Wholesale & retail | 2017 |
| Tick Tock and Twinkle Ltd | Wholesale & retail | 2019 |
| Ticket Haven Limited | Information & communication | 2016 |
| Tiddlywinks Play Group Ltd | Health & social care | 2022 |
| Tidy Homes London Ltd | Administrative & support | 2021 |
| Tied With Love Limited | Wholesale & retail | 2025 |
| Tier Construction Limited | Construction | 2024 |
| Tiffen International Limited | Administrative & support | 2001 |
| Tiffin Singh Ltd | Hospitality | 2026 |
| Tights Heaven Ltd | Wholesale & retail | 2017 |
| Tiho Limited | Hospitality | 2024 |
| Tikka House Ltd | Hospitality | 2023 |
| Tikka Tiko Limited | Hospitality | 2026 |
| Tilaw Catering Services Ltd | Hospitality | 2025 |
| Tilaw Romford Ltd | Hospitality | 2025 |
| Tile Depot Limited | Wholesale & retail | 2023 |
| Tile Town Bathrooms Ltd | Wholesale & retail | 2025 |
| Tiles Smart Limited | Wholesale & retail | 2019 |
| TIM Soft UK Ltd | Wholesale & retail | 2011 |
| Timber and Kaliber Consult Limited | Transport & logistics | 2023 |
| Timber Construction Essex Ltd | Construction | 2024 |
| Timber&Kaliber Travel Ltd | Administrative & support | 2023 |
| Timcris Ltd | Construction | 2016 |
| Time and Chance Global Services Ltd | Transport & logistics | 2026 |
| Time IS Filmatic Ltd | Information & communication | 2026 |
| Time Savers Property Services Ltd | Construction | 2025 |
| Time Transformations Ltd | Information & communication | 2026 |
| Timeforce Care Ltd | Professional & scientific | 2015 |
| Timeless Studio London Limited | Professional & scientific | 2023 |
| Timeless Threads by Sahar Ltd | Manufacturing | 2026 |
| Timeless Touch Events Ltd | Hospitality | 2025 |
| Times Real Estate Ltd | Real estate | 2026 |
| Timeslink Ltd | Wholesale & retail | 2017 |
| Timing IS Everything Ltd | Information & communication | 2024 |
| TIN PAN Alley Limited | Wholesale & retail | 2016 |
| Tinamoo Property Limited | Real estate | 2026 |
| Tinamoo Service Limited | Health & social care | 2025 |
| Tinglebrick Limited | Professional & scientific | 2019 |
| Tink Jewellery Limited | Manufacturing | 2007 |
| Tinoria Ltd | Real estate | 2023 |
| Tintbrand Limited | Real estate | 1987 |
| Tinted.The RMW EYE Studio Ltd | Health & social care | 2025 |
| Tinuit Ltd | Information & communication | 2014 |
| Tiny Hill Property Services Ltd | Professional & scientific | 2022 |
| Tiny Tuff Explorers CIC | Education | 2026 |
| Tiny Tummy Limited | Hospitality | 2025 |
| TIP Top Joinery Ltd | Manufacturing | 2020 |
| Tipa Investment Limited | Real estate | 2026 |
| Tipsy Collective Ltd | Hospitality | 2026 |
| Tisburys Aquatic Centre Limited | Wholesale & retail | 2006 |
| Tisi Property Ltd | Real estate | 2025 |
| Titan Skin Company Ltd | Manufacturing | 2022 |
| Titanbrick Developments Limited | Real estate | 2026 |