| Tamarind House Ltd | Hospitality | 2026 |
| Tambz Treats Ltd | Manufacturing | 2021 |
| Tamera Healthcare Ltd | Health & social care | 2014 |
| Tammy Mccann Ltd | Other services | 2022 |
| Tammy's Tiny Tots Limited | Health & social care | 2016 |
| Tanahu Limited | Construction | 2025 |
| Tandon 96 Park Lane Ltd | Construction | 2007 |
| Tandon Family Office Limited | Financial services | 2023 |
| Tandoori Junction Ltd | Hospitality | 2016 |
| Tanell Enterprise Ltd | Wholesale & retail | 2024 |
| Tangent Developments Limited | Real estate | 2010 |
| Tangy Ltd | Professional & scientific | 2016 |
| Tanink (Europe) Limited | Administrative & support | 2001 |
| Tanit Web Ltd | Information & communication | 2016 |
| Tanka Mudra Limited | Wholesale & retail | 2023 |
| Tankerville Communications Ltd | Information & communication | 2015 |
| Tanya Hudson Architecture and Interior Design Ltd | Professional & scientific | 2022 |
| Tanyard Close Residents Association Limited | Households | 1988 |
| Tanzcargo Limited | Transport & logistics | 2020 |
| TAO Cafe Ltd | Hospitality | 2024 |
| TAP Community Bars Ltd | Hospitality | 2024 |
| TAP GP Limited | Health & social care | 2020 |
| Tapop Management Limited | Extraterritorial | 2025 |
| Tara Consultancy Services Ltd | Professional & scientific | 2025 |
| Taraberry Limited | Households | 1978 |
| Tarch Designs Limited | Professional & scientific | 2024 |
| Tarfs Accountants (Tax Auditing Risks and Financials Solutions Accountants) Ltd | Professional & scientific | 2014 |
| Target Associates Limited Partnership | | 2008 |
| Targetgrow Digital Ltd | Information & communication | 2025 |
| Tarikee Group Ltd | Hospitality | 2025 |
| Tariq Foods SW16 Limited | Wholesale & retail | 2020 |
| Tarktarjnar Ltd | Real estate | 2025 |
| Tarn Stones Homes Limited | Real estate | 2024 |
| Tarnbrook Court (Management) Limited | Households | 1983 |
| Tarpots Discount Store Limited | Wholesale & retail | 2014 |
| Tarrant & Wheeler Limited | Professional & scientific | 2012 |
| Tarrsons (UK) Ltd | Wholesale & retail | 1997 |
| Tarsh International Limited | Wholesale & retail | 2015 |
| Tarushri Properties Ltd | Real estate | 2025 |
| Taryn Grove Residents Association Limited | Households | 2011 |
| Tasa Property & Letting Limited | Real estate | 2024 |
| Tasc Fashion Ltd | Information & communication | 2024 |
| Tasha Restaurant Ltd | Hospitality | 2026 |
| Tasir Consulting Ltd | Professional & scientific | 2024 |
| Taste Fusion Private Ltd | Administrative & support | 2023 |
| Taste Like Home Catering and Cleaning Limited | Hospitality | 2023 |
| Taste of Cochin Ltd | Hospitality | 2019 |
| Taste of Indian (CR) Limited | Hospitality | 2025 |
| Taste of Kerala (PVT) Limited | Hospitality | 2022 |
| Tastes Like Home CIC | Education | 2025 |
| Tasty B Catering Ltd | Hospitality | 2020 |
| Tasty Grill House Ltd | Hospitality | 2026 |
| TAT Building Ltd | Construction | 2020 |
| Tatang Rining Limited | Professional & scientific | 2026 |
| Tate Gardens Management Limited | Households | 2001 |
| Tattenhall Management Company Limited | Households | 2007 |
| Tatton Green (Management Company) Limited | Households | 2007 |
| Tattooed Bakers Limited | Manufacturing | 2011 |
| TAV Event Planner Limited | Administrative & support | 2023 |
| Tavener Fields 'British Timken' Management Company Limited | Households | 2011 |
| Tawana Limited | Wholesale & retail | 2006 |
| Tawazun Health Ltd | Health & social care | 2018 |
| Tax and Save Ltd | Professional & scientific | 2013 |
| Tax AS YOU Earn Ltd | Professional & scientific | 2016 |
| Tax Embassy Ltd | Professional & scientific | 2020 |
| Tax Soft Limited | Professional & scientific | 2016 |
| Taxaccolega Accountants & Tax Consultants Ltd | Professional & scientific | 2011 |
| Taxaccolega Ltd | Information & communication | 2011 |
| Taxcom Limited | Professional & scientific | 2003 |
| Taxguide Accountants Ltd | Professional & scientific | 2020 |
| Taxi Admats UK Ltd | Professional & scientific | 2023 |
| Taxnsave Direct Ltd | Professional & scientific | 2018 |
| Taxnsave Ltd | Administrative & support | 2015 |
| Taxvision (UK) Limited | Professional & scientific | 2008 |
| Taya Oriental Ltd | Hospitality | 2023 |
| Taykar Solution Ltd | Construction | 2025 |
| Taylor Building Company Ltd | Construction | 2007 |
| Taylor Green Homes Limited | Construction | 2017 |
| Taylor Public Services Ltd | Professional & scientific | 2019 |
| Taylor Woodrow Construction Holdings | Wholesale & retail | 1936 |
| Taylors Caledonian Limited | Wholesale & retail | 2014 |
| Tayrona Property Limited | Real estate | 2020 |
| Tayzana Limited | Wholesale & retail | 1986 |
| TAZ Self Ltd | Health & social care | 2024 |
| TB 2021 Ltd | Real estate | 2023 |
| TBA Rail Ltd | Professional & scientific | 2018 |
| Tbeagle Ltd | Extraterritorial | 2019 |
| TBL Couriers Ltd | Transport & logistics | 2025 |
| TBL Mint Ltd | Wholesale & retail | 2026 |
| Tbxh@ Sunley Ltd | Real estate | 2023 |
| TC Catering London Ltd | Hospitality | 2026 |
| TC Croydon Limited | Professional & scientific | 2017 |
| TC SWP Limited | Professional & scientific | 2024 |
| Tc&T Limited | Professional & scientific | 2014 |
| Tceps Limited | Professional & scientific | 2020 |
| TCG Property Management Ltd | Real estate | 2025 |
| Tchegnon Logistics Ltd | Transport & logistics | 2018 |
| TCJ Construction Ltd | Construction | 2023 |
| TDA Services Ltd | Professional & scientific | 2019 |
| Tdoutline Limited | Professional & scientific | 2017 |