| Tiparu Trans Ltd | Transport & logistics | 2022 |
| Tipsy Tea Rooms Ltd | Hospitality | 2024 |
| Tipton Commercial Properties Limited | Real estate | 2020 |
| TIR Cargo Ltd | Transport & logistics | 2021 |
| Tispol Organisation | Professional & scientific | 2000 |
| Titan Developments(Uk) Limited | Construction | 2019 |
| Titan Portable Facilities Limited | Administrative & support | 2026 |
| Titan Wholesale Group Ltd | Wholesale & retail | 2025 |
| Titana Group Ltd | Professional & scientific | 2006 |
| Titus Kennels Ltd | Agriculture & fishing | 2020 |
| Tivira Limited | Wholesale & retail | 2025 |
| Tiwi Holding Limited | Professional & scientific | 2018 |
| TJ Arbitrage Limited | Wholesale & retail | 2023 |
| TJ Dawson Enterprise Ltd | Wholesale & retail | 2026 |
| TJ Discount Group Ltd | Wholesale & retail | 2017 |
| TJ Paint and Panel Ltd | Wholesale & retail | 2023 |
| TJ Railway Services Limited | Construction | 2017 |
| TJ Solar Ltd | Construction | 2023 |
| TKL Agricultural Contractors Ltd | Agriculture & fishing | 2020 |
| TKL Earthworks & Soil Stabilisation Limited | Construction | 2017 |
| TKL Skip Hire Ltd | Water & waste | 2019 |
| TKM Logistics Ltd | Transport & logistics | 2024 |
| TKS Installations Limited | Construction | 2022 |
| TLB Productions Ltd | Arts & recreation | 2021 |
| TLW Global Limited | Wholesale & retail | 2022 |
| TM Carlos 13 Ltd | Public administration | 2022 |
| TM Holdco Limited | Financial services | 2026 |
| TM Hospitality Group Limited | Administrative & support | 2016 |
| TM Properties (Yorkshire) Ltd | Real estate | 2026 |
| TM Traffic Limited | Construction | 2022 |
| TM Worldwide Ltd | Wholesale & retail | 2023 |
| TMA (DON) Limited | Hospitality | 2012 |
| TMB Retail Music Ltd | Wholesale & retail | 2004 |
| TMC Doncaster Limited | Professional & scientific | 2016 |
| Tmcrfm Limited | Information & communication | 2008 |
| TMD Property Limited | Real estate | 2023 |
| Tmertoncommunications Ltd | Information & communication | 2016 |
| TMG Healthcare Services Limited | Administrative & support | 2022 |
| TMG Retail Ltd | Wholesale & retail | 2020 |
| Tmguk Limited | Construction | 2024 |
| TMR Studios Limited | Professional & scientific | 2015 |
| TMS (International) Ltd | Professional & scientific | 2010 |
| TMT Tyreese Ltd | Other services | 2021 |
| Tmutilities Ltd | Wholesale & retail | 2025 |
| TN Bennett Limited | Administrative & support | 2008 |
| TN Bennett Training Services Limited | Education | 2014 |
| TNA Plumbing and Heating Ltd | Construction | 2018 |
| TNS Mobile Technicians Ltd | Wholesale & retail | 2025 |
| TNT Hire Limited | Administrative & support | 2025 |
| TNT Sales Ltd | Wholesale & retail | 2025 |
| TNV Valeting Ltd | Wholesale & retail | 2021 |
| Tobacconist Mini Market Ltd | Wholesale & retail | 2022 |
| Tobaud Ltd | Real estate | 2023 |
| Tobee Medical Limited | Health & social care | 2026 |
| Tobrey Holdings Ltd | Financial services | 2025 |
| Tobrey Limited | Manufacturing | 2025 |
| Tobys Barber Limited | Other services | 2024 |
| TOD Electrical Limited | Construction | 2023 |
| Today Mini Market 1 Limited | Wholesale & retail | 2026 |
| Today Publications Limited | Information & communication | 2011 |
| Today's Wholesale Services Limited | Wholesale & retail | 2011 |
| Todomodo Ltd | Professional & scientific | 2016 |
| Todwick Grill Limited | Hospitality | 2026 |
| Todwick Properties Limited | Real estate | 2019 |
| Tofg International Limited | Transport & logistics | 2026 |
| Toftwood Properties Ltd | Households | 2025 |
| Together in Motion CIC | Education | 2026 |
| Together in Wellness CIC | Public administration | 2022 |
| Together Livin Ltd | Health & social care | 2024 |
| Togetherly Limited | Extraterritorial | 2023 |
| Togethernet Ltd | Information & communication | 2012 |
| TOH Solutions Limited | Other services | 2014 |
| TOK Consultancy Limited | Professional & scientific | 2018 |
| Tolgad Ltd | Wholesale & retail | 2023 |
| Tolgate Health Ltd | Health & social care | 2025 |
| Toll Bar General Store Ltd | Wholesale & retail | 2021 |
| Toll Bar Self Storage Ltd | Administrative & support | 2022 |
| TOM Armitage Consultancy Ltd | Professional & scientific | 2024 |
| TOM Jolley Engineering Services Limited | Manufacturing | 2025 |
| TOM Simcox Limited | Other services | 2017 |
| TOM Sowinski Limited | Transport & logistics | 2016 |
| TOM Tobia Ltd | Professional & scientific | 2017 |
| Tom's TM Ltd | Public administration | 2024 |
| Tomar Transport Ltd | Transport & logistics | 2015 |
| Tomasz Moskal Ltd | Transport & logistics | 2020 |
| Tomcaravans Ltd | Wholesale & retail | 2021 |
| Tomex-Transport Ltd | Transport & logistics | 2017 |
| Tomgos Ltd | Transport & logistics | 2017 |
| Tommys Trading Community Limited | Financial services | 2026 |
| Tomplan Ltd | Real estate | 2024 |
| Tomplan Tomasz Zadrozny Ltd | Professional & scientific | 2026 |
| Toms Electrical Ltd | Construction | 2026 |
| Tondra Digital Solutions Ltd | Information & communication | 2026 |
| Tonercart Ltd | Manufacturing | 2009 |
| Toni Shop Ltd | Wholesale & retail | 2025 |
| Tonifm Ltd | Transport & logistics | 2019 |
| Tony M Ltd | Professional & scientific | 2024 |
| Tony Rockwell Tools Ltd | Manufacturing | 2025 |
| Tonyj Trading Limited | Administrative & support | 2014 |
| TOO LOW Ltd | Arts & recreation | 2020 |