| TP Rose Contractors Limited | Construction | 2026 |
| Traainer Limited | Professional & scientific | 2022 |
| Track Force Ltd | Construction | 2022 |
| Trackside Investments Ltd | Real estate | 2025 |
| Tracy Thompson Limited | Administrative & support | 2009 |
| Trade Paints UK Limited | Manufacturing | 1997 |
| Trade Price Forktrucks Limited | Wholesale & retail | 2022 |
| Trade Sales (Essex) Ltd | Wholesale & retail | 2012 |
| Trade Scaffolding Ltd | Construction | 2017 |
| Training by Liberty Limited | Education | 2023 |
| Trainplus Ltd | Education | 2009 |
| Traksmart Ltd | Wholesale & retail | 2025 |
| Transport Options Ltd | Transport & logistics | 2022 |
| Trantor Prime Limited | Wholesale & retail | 2026 |
| Travel & Hospitality Talent Hub Ltd | Administrative & support | 2026 |
| Travel Clinic Essex Ltd | Health & social care | 2020 |
| Treadsmart Ltd | Wholesale & retail | 2024 |
| Treasures on Sea Ltd | Wholesale & retail | 2022 |
| Tree Tots PRE School Ltd | Education | 2021 |
| Treetops Co-Op Ltd | Real estate | 2022 |
| Treetops Training Ltd | Education | 2021 |
| Tress: the Resourceful Eco-Friendly Sustainable Shop Ltd | Wholesale & retail | 2024 |
| Tribe Sweat Limited | Arts & recreation | 2022 |
| Trigger Your Bliss CIC | Arts & recreation | 2023 |
| Triginta Tres Ltd | Information & communication | 2025 |
| Trine Medics Limited | Health & social care | 2025 |
| Trinity Chair Hire Limited | Other services | 2025 |
| Trinity Holdings South Limited | Real estate | 2023 |
| Trinity Homes South Limited | Construction | 2003 |
| Trinovantes Limited | Professional & scientific | 2010 |
| Tripbooth Limited | Administrative & support | 2016 |
| Tristone Holdings Limited | Financial services | 2018 |
| Triton Marine Ltd | Other services | 2020 |
| Trojan Fire & Security Solutions Ltd | Construction | 2026 |
| Trojan Training Ltd | Professional & scientific | 2024 |
| Tropical Cleaners Ltd | Administrative & support | 2021 |
| Tropical Forest Plantations Limited | Agriculture & fishing | 2014 |
| Trouble to Triumph Limited | Information & communication | 2015 |
| Trove Play Cafe Ltd | Hospitality | 2026 |
| Trueflow Heating & Plumbing Limited | Construction | 2012 |
| Trufflehunting Business Services Ltd | Administrative & support | 2018 |
| Trufflehunting Limited | Professional & scientific | 2015 |
| Trusted Wills Essex Ltd | Professional & scientific | 2022 |
| Trutrition Limited | Wholesale & retail | 2023 |
| TS LOS Limited | Hospitality | 2024 |
| TSA Consultants (UK) Ltd | Professional & scientific | 2014 |
| TSA SX Ltd | Construction | 2018 |
| TSA SX Property Ltd | Real estate | 2020 |
| Tsambou Supplied Ltd | Wholesale & retail | 2025 |
| TT Residential Property Services Limited | Real estate | 2020 |
| Ttmm Property Ltd | Real estate | 2024 |
| Tudc Limited | Wholesale & retail | 2014 |
| Tudor Lodge (Essex) Limited | Real estate | 2006 |
| Tuesday Digital Ltd | Information & communication | 2019 |
| Tulin Limited | Real estate | 2020 |
| Tung TEP Property Limited | Real estate | 2023 |
| Tunnel Lining Systems Limited | Construction | 2013 |
| Tuppence Property Holdings Limited | Financial services | 2025 |
| Tuppence Property Investments Limited | Real estate | 2025 |
| Turner Lettings & Developments Ltd | Real estate | 2023 |
| Turners Consultancy Limited | Information & communication | 2024 |
| Tuscan Boards Limited | Hospitality | 2024 |
| Tutr Limited | Education | 2023 |
| Tutti Leigh-On-Sea Ltd | Hospitality | 2023 |
| TVD Haulage Limited | Transport & logistics | 2013 |
| TVM Consultancy Limited | Professional & scientific | 2012 |
| TWB2 Limited | Hospitality | 2022 |
| TWE Property Services Ltd | Real estate | 2021 |
| Twenty One Acquisitions Limited | Real estate | 2023 |
| Twin Oaks Swimming Limited | Education | 2018 |
| Twist Equities LLP | | 2011 |
| Two Three Consulting Limited | Professional & scientific | 2024 |
| Two Three Properties Limited | Real estate | 2021 |
| Twofold Associates Limited | Professional & scientific | 2025 |
| Twotwentythree Ltd | Households | 2016 |
| Tyre Tech Mobile Limited | Wholesale & retail | 2008 |
| Tyretech Autocentre Limited | Wholesale & retail | 2022 |
| Tyrie Enterprises Limited | Wholesale & retail | 2008 |
| Uber Rail Services Limited | Construction | 2012 |
| Ubique Management Services Ltd | Professional & scientific | 2016 |
| Ucomm Solutions Limited | Information & communication | 2018 |
| UD (Essex) Ltd | Construction | 2023 |
| Udra Capital Ltd | Real estate | 2025 |
| Ugoout Ltd | Professional & scientific | 2021 |
| UK Auto Sales Limited | Wholesale & retail | 2016 |
| UK Olives Ltd | Extraterritorial | 2015 |
| UK Room (London) Limited | Administrative & support | 2010 |
| Ukwts Limited | Administrative & support | 2024 |
| Ultimate Carpentry & Building Contractors Ltd | Construction | 2014 |
| Ultra Fire Ltd | Public administration | 2021 |
| Ultracoach Ltd | Education | 2018 |
| Uncle Roy's Rotarys Ltd | Arts & recreation | 2011 |
| Undercurrent (UK) Limited | Administrative & support | 2008 |
| Unichip Technologies Limited | Manufacturing | 2021 |
| Union Fighting Limited | Wholesale & retail | 2023 |
| Unit Engineering Ltd | Manufacturing | 2009 |
| United Management Technologies (Europe) Limited | Professional & scientific | 1997 |
| United Peoples TV Limited | Professional & scientific | 2013 |
| United Print Finishers Limited | Manufacturing | 2004 |
| Universally Together Limited | Real estate | 2024 |