| THE Shore Freehold Company Ltd | Households | 2022 |
| THE Software Foundry Limited | Extraterritorial | 1987 |
| THE Song School (South) Ltd | Information & communication | 2018 |
| THE Soulful Creative Ltd Ltd. | Hospitality | 2024 |
| THE Southend Mini Store Limited | Wholesale & retail | 2022 |
| THE Sovereign Syndicate Ltd | Hospitality | 2025 |
| THE Sparks Capital Ltd | Financial services | 2025 |
| THE Square Coffee Co. Limited | Hospitality | 2021 |
| THE Stambridge Group Limited | Public administration | 2011 |
| THE Stillwell Family LLP | | 2021 |
| THE Taste Experience Ltd | Hospitality | 2012 |
| THE Tempo Collective Ltd | Arts & recreation | 2022 |
| THE Three Tuns (Great Abington) Ltd | Hospitality | 2005 |
| THE Tors (Tavistock) Management Company Limited | Households | 2019 |
| THE Underdogs Agency Ltd | Administrative & support | 2024 |
| THE Verve Clinic Ltd | Health & social care | 2020 |
| THE Whitehall Investment Group Ltd | Administrative & support | 2022 |
| THE Willows Corporation Limited | Real estate | 2019 |
| THE Wonders of Vintage Limited | Wholesale & retail | 2017 |
| THE Work Perk Limited | Administrative & support | 2008 |
| THE World Famous Skin Sorcerer Limited | Arts & recreation | 2015 |
| THE Wright Look Models Ltd | Other services | 2011 |
| THE Yoga Factory Limited | Arts & recreation | 2018 |
| Thebeckflora Ltd | Wholesale & retail | 2024 |
| Theblokhousestudio CIC | Arts & recreation | 2023 |
| Theemaha Ltd | Wholesale & retail | 2023 |
| Thefullworks Limited | Information & communication | 2015 |
| Thegoldscarf Ltd | Wholesale & retail | 2024 |
| Thekalmbeautycompanies Ltd | Other services | 2025 |
| Thenjie Private Ltd | Health & social care | 2019 |
| Theo App Ltd | Information & communication | 2026 |
| Theodore Charles Ltd | Wholesale & retail | 2019 |
| Thermoplay (UK) Ltd | Wholesale & retail | 2001 |
| Thesar Ltd | Professional & scientific | 2023 |
| Think Change Counselling Therapies Limited | Health & social care | 2021 |
| Think Dynamics Recruitment Ltd | Information & communication | 2019 |
| This Girl CAN Organise Ltd | Professional & scientific | 2021 |
| Thomas Design & Build Limited | Construction | 2025 |
| Thomas Koch Ltd | Construction | 2016 |
| Thomas Lindsey Brown & Co Ltd | Professional & scientific | 2015 |
| Thompson 37 & Co Ltd | Other services | 2023 |
| Thompson Anaesthetic Services Ltd | Health & social care | 2013 |
| Thomson Ventures Limited | Financial services | 2026 |
| Thornborough Avenue (South Woodham Ferrers) Management Company Limited | Households | 1985 |
| Thorpe Property Trading Ltd | Real estate | 2015 |
| Thorpe Bay Estate Company Limited | Real estate | 2000 |
| Thorpe Capital Ltd | Financial services | 2025 |
| Thorpe Commercial Limited | Real estate | 2024 |
| Thorpe Estate Limited | Real estate | 1984 |
| Thorpe Hall Hearing Healthcare Limited | Health & social care | 1998 |
| Thorpe Hall School (Essex) Limited | Real estate | 1974 |
| Thorpe Lodge Residents Limited | Households | 2003 |
| Three TEN Eighty Limited | Arts & recreation | 2003 |
| Three's a Crowd Management Limited | Professional & scientific | 2018 |
| Thriveriseagency Ltd | Administrative & support | 2024 |
| Thryvsoul Limited | Information & communication | 2025 |
| Thumame Ltd | Administrative & support | 2026 |
| Thurston (Bury ST Edmunds) Managing Company Limited | Professional & scientific | 2019 |
| Thurza Court (Isleworth) Management Company Limited | Households | 1968 |
| Tidal Film Ltd | Information & communication | 2008 |
| Tideez Limited | Manufacturing | 2012 |
| Tidykat Ltd | Transport & logistics | 2026 |
| Tiger Financial Solutions Limited | Financial services | 2016 |
| Tihson Builders Ltd | Construction | 2023 |
| Tihson Properties Ltd | Real estate | 2025 |
| Tili Ltd | Real estate | 2026 |
| Tilt.Inc Ltd | Education | 2025 |
| TIM Wakefield Consulting Limited | Administrative & support | 2016 |
| Timber & Stone Renovations Ltd | Construction | 2025 |
| Timberland Flooring (South Essex) Limited | Administrative & support | 2002 |
| Timeless Concept Group Limited | Wholesale & retail | 2020 |
| Times of Need Ltd | Health & social care | 2020 |
| TIN Transport and Logistics Ltd | Transport & logistics | 2026 |
| Tina Dahs Limited | Health & social care | 2011 |
| Tincompany Ltd | Construction | 2025 |
| Tinconstruction Ltd | Construction | 2014 |
| Tinmac Limited | Health & social care | 2022 |
| Tiny Galaxy Ltd | Professional & scientific | 2018 |
| Tipper Company Holdings Ltd | Real estate | 2020 |
| Tish-Uk Ltd | Wholesale & retail | 2026 |
| Titanic Ventures Limited | Administrative & support | 2023 |
| Titanium Solutions Limited | Information & communication | 1999 |
| Titans Healthcare Limited | Administrative & support | 2020 |
| Titilayo Luxury Limited | Wholesale & retail | 2021 |
| Tjankurito Ltd | Transport & logistics | 2015 |
| TJR Contracts Limited | Construction | 2001 |
| TJW Aircraft Engineering Limited | Manufacturing | 2010 |
| TK Medicare Limited | Health & social care | 2015 |
| TK Solutions AG Limited | Professional & scientific | 2010 |
| Tkas Social Care Limited | Health & social care | 2010 |
| TLC Bricklayers Limited | Construction | 2019 |
| Tlksb Limited | Professional & scientific | 2016 |
| Tloma Limited | Real estate | 2022 |
| TME Real Estate Limited | Real estate | 2017 |
| TMY Broadcast Ltd | Information & communication | 2023 |
| TN37 Limited | Real estate | 2025 |
| TNS Contractors Ltd | Construction | 2015 |
| TNS111 Ltd | Real estate | 2022 |
| Toby Teaches Tech Ltd | Information & communication | 2019 |
| Tolhurst Fisher LLP | | 2007 |