| Thelondontradingacademy Limited | Wholesale & retail | 2024 |
| Themaro Ltd | Administrative & support | 2025 |
| Thermal Insulation Solutions Limited | Professional & scientific | 2024 |
| Thessay Associates Ltd | Wholesale & retail | 2007 |
| This IS MI Limited | Health & social care | 2024 |
| Thistle Education Services Limited | Education | 2022 |
| Thomas Marsh Ltd | Real estate | 2009 |
| Thomes Ltd | Construction | 2025 |
| THOONG2021 Ltd | Real estate | 2025 |
| Thorogood Vehicle Repairs Ltd | Wholesale & retail | 2022 |
| Three 6IXTY Ltd | Health & social care | 2024 |
| Three Hale Limited | Health & social care | 2013 |
| Threeps Holding Ltd | Financial services | 2018 |
| Threeps Property Ltd | Real estate | 2022 |
| Threshold Architects Ltd | Professional & scientific | 2015 |
| Thrifted Limited | Wholesale & retail | 2017 |
| Thunder-Z Ltd | Construction | 2015 |
| Thuris LLP | | 2019 |
| Thurlby House Limited | Households | 1994 |
| Thurrock and Brentwood Mind | Health & social care | 2004 |
| Thurrock Auto Care Ltd | Wholesale & retail | 2022 |
| Thurrock Autos Ltd | Transport & logistics | 2019 |
| Thurrock Bathrooms Limited | Wholesale & retail | 2026 |
| Thurrock BME Group Ltd | Other services | 2018 |
| Thurrock Ceilings & Partitions Ltd | Construction | 2024 |
| Thurrock Coalition | Health & social care | 2010 |
| Thurrock Commercial Services Limited | Manufacturing | 2002 |
| Thurrock Community Athletics | Arts & recreation | 2000 |
| Thurrock Community Leisure Limited | Arts & recreation | 1999 |
| Thurrock Containers Ltd | Other services | 2015 |
| Thurrock Crossfit Training Ltd | Other services | 2025 |
| Thurrock Electrical Limited | Construction | 2017 |
| Thurrock Garden Services Ltd | Administrative & support | 2017 |
| Thurrock Hair Clinic Ltd | Other services | 2010 |
| Thurrock Hardwoods Limited | Wholesale & retail | 1997 |
| Thurrock Lifestyle Solutions CIC | Health & social care | 2007 |
| Thurrock Local Enterprise Agency Limited | Administrative & support | 1985 |
| Thurrock Lofts Ltd | Construction | 2025 |
| Thurrock Masonic Hall Limited | Hospitality | 1961 |
| Thurrock Open Door | Health & social care | 2006 |
| Thurrock Regeneration Homes Ltd | Construction | 2017 |
| Thurrock Regeneration Ltd | Construction | 2013 |
| Thurrock RFC Trading Limited | Arts & recreation | 2017 |
| Thurrock Taxi CAB Ltd | Transport & logistics | 2021 |
| Thurrock Tool Hire Limited | Administrative & support | 1991 |
| Thurrock Training Limited | Education | 2018 |
| Thurrock Tree Services Ltd | Administrative & support | 2017 |
| Thurrock Tuition Academy Ltd | Education | 2026 |
| Thurrock’S Little Learners Ltd | Health & social care | 2024 |
| Thurston Tipper Hire Ltd | Transport & logistics | 2021 |
| Thymeless Table Events Ltd | Hospitality | 2026 |
| Ticculture Ltd | Education | 2012 |
| Ticsons Holdings Ltd | Real estate | 2025 |
| Tidy Plumbing Ltd | Construction | 2024 |
| Tierneys Salon Hair & Beauty Ltd | Other services | 2021 |
| TIG Healthcare Limited | Extraterritorial | 2013 |
| Tiim UK Ltd | Education | 2025 |
| Tiki Insulations Limited | Construction | 2006 |
| Tilbury Tiles Limited | Wholesale & retail | 2000 |
| Timandson Ltd | Information & communication | 2022 |
| Timber & Thread Ltd | Wholesale & retail | 2025 |
| Timewise Virtual Services Limited | Administrative & support | 2012 |
| Timi Hub Enterprise Limited | Real estate | 2024 |
| Timi Transport Ltd | Transport & logistics | 2020 |
| Timka Service Ltd | Construction | 2024 |
| Tinyosa Services Limited | Information & communication | 2004 |
| TIS 92 Ltd | Construction | 2017 |
| Tiwi Ltd | Wholesale & retail | 2021 |
| TJ Charity and Support Foundation Ltd | Health & social care | 2022 |
| TJ Team Ltd | Health & social care | 2024 |
| TJM Haris Ltd | Transport & logistics | 2015 |
| TJR Consultants Limited | Professional & scientific | 2017 |
| TK Installers Ltd | Construction | 2017 |
| Tk&K Ltd | Real estate | 2021 |
| TKH Ongar Ltd | Hospitality | 2025 |
| TKR UK Properties Ltd | Real estate | 2024 |
| TLC Beauty Training Academy Limited | Education | 2019 |
| TLC Nails & Beauty Limited | Other services | 2018 |
| TLO Consultancy Limited | Professional & scientific | 2024 |
| TM Capital Investments Limited | Real estate | 2017 |
| TM Gallants Limited | Transport & logistics | 2020 |
| TM Painting and Decorating Ltd | Construction | 2020 |
| TM Team Construction Limited | Construction | 2022 |
| Tmake Auto Services Limited | Wholesale & retail | 2020 |
| TMG (Essex) Limited | Construction | 2020 |
| TMN Management Limited | Hospitality | 2015 |
| TMR Management Limited | Other services | 2010 |
| TMS Fleet Services Ltd | Wholesale & retail | 2025 |
| TMZ Constructions UK Ltd | Construction | 2022 |
| TNJ Limited | Construction | 2015 |
| Toad Projects Services Limited | Information & communication | 2022 |
| Tobak Global Limited | Construction | 2025 |
| Tobb Property Ltd | Real estate | 2024 |
| Tobeeit Ltd | Information & communication | 2025 |
| Toddest Ltd | Construction | 2023 |
| TOF Solutions Ltd | Professional & scientific | 2013 |
| Toka Builders Ltd | Construction | 2014 |
| TOM Commercials Ltd | Manufacturing | 2025 |
| TOM Projects Ltd | Construction | 2026 |
| TOM TOM Solutions Ltd | Construction | 2017 |