| THE Willows at Westmead Limited | Other services | 2014 |
| Third of MAY Productions Limited | Administrative & support | 2014 |
| Thol Services Limited | Professional & scientific | 2022 |
| Threads by Megs Ltd | Wholesale & retail | 2025 |
| Thrive Wellbeing Essex Limited | Health & social care | 2026 |
| Thunderwing Productions Limited | Information & communication | 1999 |
| THW Consultancy Services Limited | Information & communication | 2015 |
| Ticknall Limited | Professional & scientific | 1996 |
| Tigermar (UK) Limited | Financial services | 2014 |
| Tile Kiln Farm Limited | Agriculture & fishing | 2023 |
| TIM Snow Architects Ltd | Professional & scientific | 2003 |
| Titan Welding Ltd | Manufacturing | 2025 |
| TKG Contracts Ltd | Construction | 2018 |
| Tobton Consultacy Ltd | Information & communication | 2014 |
| TOM Blackwell (Contractors & Plant Hire) Limited | Construction | 1985 |
| TOM Sorell Ltd | Professional & scientific | 2002 |
| Tool M8 Limited | Administrative & support | 2022 |
| Toonjam Studios Ltd | Arts & recreation | 2011 |
| Top Gear Driving School | | 1988 |
| Toppesfield Hall Limited | Extraterritorial | 1989 |
| Topservice (Refurbishments) Limited | Construction | 2008 |
| Torsor Limited | Professional & scientific | 2025 |
| Total Tops Ltd | Construction | 2018 |
| Totham Chase Management Company Limited | Real estate | 1989 |
| Touareg Berber Limited | Real estate | 1994 |
| TP Plant Repairs & Inspections Ltd | Professional & scientific | 2023 |
| TR Coppin Ltd | Construction | 2002 |
| Transporter Engineering Limited | Manufacturing | 2002 |
| Transporter Sales & Hire Limited | Wholesale & retail | 2009 |
| Transvisory Ltd | Information & communication | 2025 |
| Trelawn Properties Limited | Real estate | 1992 |
| Trend Capital Limited | Administrative & support | 2010 |
| Trevor Kennedy Limited | Construction | 2003 |
| Trew Publishing Ltd | Information & communication | 2014 |
| Tri-Trained Ltd | Manufacturing | 2019 |
| Trinova Tree Care Ltd | Other services | 2004 |
| Triple a Waste Ltd | Water & waste | 2022 |
| Triple Five Asset Limited | Real estate | 2012 |
| Triple Halstead Management Limited | Households | 2024 |
| Triumph Heating Ltd | Construction | 2019 |
| Trust NS Cars Ltd | Wholesale & retail | 2025 |
| TS Paediatrics Limited | Health & social care | 2021 |
| TS Technical Ltd | Construction | 2026 |
| TTL Roofing Limited | Construction | 2017 |
| Tudor House Holdings Ltd | Financial services | 2016 |
| Turp's Enterprise Limited | Other services | 2025 |
| Tutton Timber Ltd | Wholesale & retail | 2020 |
| Twist Beauty Packaging Asia Holdings Limited | Professional & scientific | 1995 |
| Twist Beauty Packaging UK Limited | Manufacturing | 2010 |
| Uisart Limited | Arts & recreation | 2004 |
| UK Structural Examinations Ltd | Construction | 2023 |
| Ultimate Stays Ltd | Real estate | 2025 |
| Umbrella Commercials Limited | Real estate | 2020 |
| Umbrella Construction Limited | Construction | 2017 |
| Under the Hazels Limited | Education | 2023 |
| Unique Build and Design Ltd | Construction | 2018 |
| Unique House Renovations Ltd | Real estate | 2020 |
| Unique Lofts (Consultancy) Ltd | Professional & scientific | 2017 |
| Unique Lofts Limited | Construction | 2016 |
| United Sports Management Team Ltd | Wholesale & retail | 2024 |
| United Streetworks Limited | Extraterritorial | 2017 |
| Unpaused Ltd | Wholesale & retail | 2023 |
| Unwin Estates Limited | Agriculture & fishing | 1951 |
| Urban Grill Ltd | Hospitality | 2025 |
| USA Halstead Ltd | Hospitality | 2025 |
| Ushers Services Ltd | Construction | 2019 |
| Utility Consultant Services Limited | Professional & scientific | 2006 |
| V Car Sales Ltd | Wholesale & retail | 2024 |
| V T & M Ltd | Other services | 2025 |
| V&S Halstead Ltd | Wholesale & retail | 2024 |
| Vale Garage Limited | Wholesale & retail | 2002 |
| Vaso Toscano Ltd | Wholesale & retail | 2015 |
| Vega Interim Limited | Professional & scientific | 2007 |
| Vehicle Service Group UK Limited | Administrative & support | 1999 |
| Ventura Digital Ltd | Information & communication | 2016 |
| Verlevo Limited | Transport & logistics | 2020 |
| Versalia Limited | Professional & scientific | 2020 |
| Verve Fitted Bedrooms Limited | Construction | 2009 |
| Victorious Properties Limited | Real estate | 2023 |
| Video Engineering Limited | Administrative & support | 1982 |
| Vinca UK Limited | Manufacturing | 2007 |
| Vineyard Street LLP | | 2010 |
| Vintage Style Hire Ltd. | Wholesale & retail | 2012 |
| Vintage Voltage Power Services Limited | Construction | 2021 |
| Visage Property Ltd | Real estate | 2021 |
| Vision Upholstery Limited | Manufacturing | 2017 |
| Visual Programmers Limited | Information & communication | 1995 |
| Vitus Components Limited | Manufacturing | 2022 |
| VMS Property Services Limited | Construction | 2024 |
| VTI Limited | Wholesale & retail | 2020 |
| W & H Sargeant Holdings Ltd | Construction | 2025 |
| W a Hurry & Sons Limited | Financial services | 2024 |
| W I Prior and SON Farming | Agriculture & fishing | 2011 |
| WAE Property Ltd | Hospitality | 2021 |
| Ward Design & Supply Limited | Professional & scientific | 2017 |
| Ward Electrical Ltd | Construction | 2024 |
| Waterside Laundrette Ltd | Administrative & support | 2019 |
| WB Investments (UK) Ltd | Administrative & support | 2013 |
| WBD Creative Ltd | Professional & scientific | 2023 |
| Wbuk Solutions Ltd | Professional & scientific | 2024 |