| TMG Consultants Ltd | Other services | 2019 |
| TMK Business Services Limited | Wholesale & retail | 2017 |
| TMK Construction Consultants Limited | Construction | 2022 |
| TMN Consultant Limited | Real estate | 2013 |
| TNI Property Limited | Real estate | 2022 |
| TNK Haulage Ltd | Transport & logistics | 2022 |
| TNM Security Services Ltd | Administrative & support | 2023 |
| Tnre Holdings Limited | Real estate | 2024 |
| TO the Point Consultancy Limited | Information & communication | 2010 |
| Todd & Edward Holdings Ltd | Financial services | 2023 |
| Todd Construction (U.K) Limited | Construction | 2021 |
| Todreed Limited | Administrative & support | 1980 |
| Together Asset Backed Securitisation 2021-1ST1 PLC | Financial services | 2021 |
| Together Building Solutions Limited | Construction | 2023 |
| Together Care Limited | Health & social care | 2016 |
| Tohabd Imports Ltd | Wholesale & retail | 2025 |
| TOJ - Tribe of Judah Ltd | Real estate | 2025 |
| Tokone Resources International Ltd | Real estate | 2025 |
| Tokset Ltd | Health & social care | 2021 |
| Tola & Asher Limited | Information & communication | 2017 |
| Tolade Ltd | Health & social care | 2022 |
| Tolhurst’S Housing Ltd | Real estate | 2026 |
| TOM and Cherrys Limited | Wholesale & retail | 2020 |
| TOM Scaffolding Limited | Construction | 2010 |
| Tomarc Services Ltd | Health & social care | 2022 |
| Tomas BUD Ltd | Construction | 2026 |
| Tomasz Cabanski Ltd | Transport & logistics | 2021 |
| Tomold Construction Ltd | Construction | 2026 |
| Tonda Ltd | Health & social care | 2026 |
| Tonehub Distribution Ltd | Wholesale & retail | 2025 |
| Toner Graphics Ltd | Wholesale & retail | 2003 |
| Tonworth Education and Development Ltd | Administrative & support | 2025 |
| Tony Electrics Ltd | Construction | 2024 |
| Tony Michael Property Services Ltd | Construction | 2015 |
| Tony Services Ltd | Transport & logistics | 2017 |
| Tony Turner Decs Limited | Construction | 2016 |
| Tonyform Projects Ltd | Construction | 2025 |
| Tony’S Restaurant Ltd | Hospitality | 2024 |
| TOO Damn Glam Limited | Arts & recreation | 2010 |
| Toomey (Southend) Limited | Wholesale & retail | 2003 |
| Toomey Leasing Group Limited | Administrative & support | 1969 |
| Toomey MG Limited | Wholesale & retail | 1999 |
| Toomey Motor Group Limited | Wholesale & retail | 1938 |
| Toomey Nissan (Southend) Ltd. | Wholesale & retail | 1999 |
| Toomey Nissan Limited | Wholesale & retail | 1979 |
| Toomey Pershow (Southend) Limited | Wholesale & retail | 2003 |
| Toomey Pershow Limited | Wholesale & retail | 2000 |
| Toomey Renno (Southend) Limited | Wholesale & retail | 2004 |
| Toomey Renno Limited | Wholesale & retail | 1981 |
| Toomey Retirement Apartments Limited | Administrative & support | 1937 |
| Toomey Sitron (Southend) Limited | Wholesale & retail | 1997 |
| Toomey Sitron Limited | Wholesale & retail | 2002 |
| Top Deal Autos Ltd | Wholesale & retail | 2025 |
| Top Express Group UK Ltd | Transport & logistics | 2015 |
| Top for Interiors Ltd | Construction | 2017 |
| Topline Design Limited | Construction | 2018 |
| Toqeph Consultants Ltd | Information & communication | 2019 |
| Torque Spec Limited | Wholesale & retail | 2024 |
| Tosam Dream Group Ltd | Construction | 2026 |
| Toshika Limited | Real estate | 2020 |
| Total Build Ltd | Construction | 2016 |
| Total Custom Carpentry Ltd | Manufacturing | 2021 |
| Total Decommissioning Limited | Water & waste | 1999 |
| Total Fit Services Ltd | Construction | 2018 |
| Total GAS Services (Essex) Ltd | Other services | 2014 |
| Total Glory Ltd | Construction | 2006 |
| Total Office Group Limited | Professional & scientific | 2016 |
| Total Respite Limited | Health & social care | 2013 |
| Total Safe Ltd | Professional & scientific | 2016 |
| Total Steel Supplies Limited | Administrative & support | 2018 |
| Total Sun Energy Limited | Other services | 2005 |
| Total Waste Management Limited | Water & waste | 1989 |
| Total Workflow Solutions Ltd | Information & communication | 2011 |
| Totally Engraved Limited | Manufacturing | 2013 |
| Totally Football Ltd | Arts & recreation | 2025 |
| Toto Logistic Ltd | Transport & logistics | 2017 |
| Tottenham Glazing Company Limited | Real estate | 1992 |
| Totun Associates Limited | Health & social care | 2018 |
| Totus Composites Limited | Wholesale & retail | 2024 |
| Touch Down Flooring Limited | Construction | 2025 |
| Touche Flooring Ltd | Construction | 2018 |
| Touchwood (East Anglia) Limited | Manufacturing | 2009 |
| Tours R US Limited | Transport & logistics | 1994 |
| Tower Bridge Funding 2021-2 PLC | Financial services | 2021 |
| Tower Bridge Funding 2022-1 PLC | Financial services | 2021 |
| Tower Bridge Funding 2023-1 PLC | Financial services | 2022 |
| Tower Bridge Funding 2023-2 PLC | Financial services | 2023 |
| Tower Bridge Funding 2024-1 PLC | Financial services | 2023 |
| Tower Demolition (Holdings) Limited | Construction | 2011 |
| Tower Street Recruitment Solutions Limited | Administrative & support | 2025 |
| Towersoft Limited | Information & communication | 2012 |
| Town & Country Pressure Washers Limited | Manufacturing | 2005 |
| TP Practice Training & Support Ltd | Administrative & support | 2021 |
| TP VENTURE1 Ltd | Real estate | 2024 |
| Tpooley Group Limited | Health & social care | 2018 |
| Tracey ANN Cavalier Limited | Extraterritorial | 2025 |
| Tracfast Ltd | Information & communication | 2023 |
| Traci Austen Consultancy Ltd | Administrative & support | 2014 |
| Track and Trace Vehicle Solutions Limited | Other services | 2023 |
| Trade Flow Pro Limited | Other services | 2025 |