| Thompson Clark Property Consultants Limited | Professional & scientific | 2019 |
| Tidy Clean Ltd | Administrative & support | 2020 |
| Tiger Associates Limited | Professional & scientific | 2023 |
| Tiger Press Limited | Manufacturing | 2020 |
| Tiger Signs and Print Ltd | Manufacturing | 2023 |
| Tilegate London Limited | Professional & scientific | 2015 |
| Timar Security Group Limited | Administrative & support | 2016 |
| Timberlog Lane Residents Association Limited | Households | 1984 |
| Tina Bailey Limited | Hospitality | 2017 |
| Tisbury Court Limited | Real estate | 2026 |
| Tisu Global Limited | Wholesale & retail | 2018 |
| Tj's Painting & Decorating Ltd. | Construction | 2019 |
| TJC Property Management Limited | Real estate | 2025 |
| Tjflooring Ltd | Construction | 2025 |
| TJM Transport Limited | Transport & logistics | 1998 |
| Tjw-Aero Ltd | Professional & scientific | 2024 |
| TKM Commercial Flooring Ltd | Construction | 2023 |
| TKS Civil Engineering Ltd | Construction | 2019 |
| TKS Development Limited | Construction | 2013 |
| TKS Ongar Ltd | Real estate | 2020 |
| TKS South West Ltd | Construction | 2015 |
| TMS Autos Limited | Transport & logistics | 2005 |
| TNA Admin Solutions Limited | Administrative & support | 2015 |
| TNY Digital Ltd | Wholesale & retail | 2024 |
| TOK Consulting Limited | Professional & scientific | 2024 |
| TOM Byrne Services Limited | Construction | 2014 |
| Tomoco Garden Services Ltd | Administrative & support | 2018 |
| Tonkin at the Crown Ltd | Hospitality | 2017 |
| Tonti Support and Integrated Logistics Ltd | Information & communication | 2025 |
| Top of the Mops Essex Limited | Administrative & support | 2022 |
| Top-Tier Party and Event Hire Ltd | Hospitality | 2025 |
| Topline Accountancy Limited | Professional & scientific | 2020 |
| Toppremium Limited | Wholesale & retail | 2018 |
| Toptec Roofing Ltd | Construction | 2019 |
| Topway Properties Limited | Real estate | 1993 |
| Toro Build Ltd | Real estate | 2026 |
| Toshia Assist Ltd | Real estate | 2013 |
| Total Mastic Limited | Construction | 2022 |
| Total Trash Waste Management Ltd | Water & waste | 2025 |
| Total Wellness Method Ltd | Health & social care | 2025 |
| Trackside Recovery Limited | Other services | 2021 |
| Trackwise Technology Ltd | Information & communication | 2023 |
| Tradecrete Ltd | Manufacturing | 2025 |
| Tradervolve Ltd | Information & communication | 2025 |
| Tradesalers Limited | Wholesale & retail | 2023 |
| Tradeverse Ltd | Wholesale & retail | 2025 |
| Tranquila Capital Limited | Real estate | 2025 |
| Transparent Recruitment Solutions Limited | Administrative & support | 2013 |
| Tremain's Canvey Limited | Real estate | 1956 |
| Trendline Clothing Ltd | Wholesale & retail | 2025 |
| Trendmartebay Ltd | Wholesale & retail | 2025 |
| Trevor Hutchinson Planning and Transportation Limited | Administrative & support | 2016 |
| Trident Safes Ltd | Manufacturing | 2014 |
| Trident Specialist Transport Ltd | Transport & logistics | 2023 |
| Trineal Homes Ltd | Construction | 2023 |
| Trinity Skincare Ltd | Wholesale & retail | 2025 |
| Trojan 24/7 Services Limited | Construction | 2013 |
| Trotters Independent Waste Removals Ltd | Water & waste | 2025 |
| Trust Construction Ltd | Construction | 2019 |
| TSA Interior Solutions Ltd | Construction | 2026 |
| Tube Tech Industrial Limited | Administrative & support | 2021 |
| Tudor Glass (Essex) Limited | Other services | 2004 |
| Tuffbau Limited | Manufacturing | 2002 |
| Tufferman Ltd | Wholesale & retail | 2012 |
| Twenty Three Red Limited | Information & communication | 2013 |
| TWENTY4 Ltd | Transport & logistics | 2025 |
| Twinkle Tiney Home Ltd | Health & social care | 2026 |
| Tyler Law Limited | Professional & scientific | 2007 |
| TYTEIKER47 Limited | Other services | 2022 |
| Tzohar Ltd | Education | 2025 |
| U-Sef Pro Sound and Light Ltd | Hospitality | 2022 |
| UFH Experts Ltd | Wholesale & retail | 2025 |
| UG Island Ltd | Hospitality | 2024 |
| UK Orders Online Ltd | Wholesale & retail | 2016 |
| UK Spotless Cleaning Ltd | Administrative & support | 2024 |
| Ultimate Skin & Beauty Limited | Other services | 2023 |
| Umika Trading Ltd | Health & social care | 2016 |
| Ummas Ltd | Wholesale & retail | 2025 |
| Undo Dents Ltd | Wholesale & retail | 2020 |
| Uneed Limited | Construction | 2009 |
| Unijet Engineering Limited | Manufacturing | 1994 |
| Unique Air Solutions (UK) Limited | Manufacturing | 2008 |
| Unique Hair & Beauty (Essex) Ltd | Other services | 2019 |
| Unit J Marconi Ltd | Real estate | 2016 |
| Unity Crest Ltd | Construction | 2024 |
| Unoccupied Property Limited | Financial services | 2017 |
| Uplift Centre Limited | Education | 2025 |
| Upper Investments Ltd | Real estate | 2024 |
| Ureco Capital Limited | Financial services | 2019 |
| Ureco Construction Limited | Construction | 2020 |
| Ureco Home 14 Limited | Construction | 2022 |
| Ureco Home 15 Limited | Construction | 2022 |
| Ureco Home 16 Limited | Construction | 2021 |
| Ureco Home 17 Limited | Real estate | 2020 |
| Ureco Home 18 Limited | Construction | 2020 |
| Ureco Home 19 Limited | Construction | 2019 |
| Ureco Home 20 Limited | Construction | 2018 |
| Ureco Home 21 Limited | Construction | 2018 |
| Ureco Home 22 Limited | Construction | 2022 |
| Ureco Home 23 Limited | Construction | 2022 |