| Thrifted Treasures Ltd | Wholesale & retail | 2025 |
| Thrive Collective Wellness Ltd | Wholesale & retail | 2025 |
| Thrive Training & Consultancy Ltd | Education | 2025 |
| Thrybergh Commercial Property Limited | Real estate | 2022 |
| Thrybergh Local Ltd | Wholesale & retail | 2025 |
| Thundercliffe Grange Limited | Real estate | 1980 |
| Thurcroft Auto Centre Ltd | Wholesale & retail | 2012 |
| Thurcroft Cancer Fund | Wholesale & retail | 2003 |
| Thurcroft Clean Hand Car Wash Ltd | Wholesale & retail | 2020 |
| Thurcroft Garage Limited | Real estate | 1975 |
| Thurcroft Group Limited | Financial services | 2021 |
| Thurcroft Miners' Welfare Institute & Recreation Ground Scheme Social Club Limited | Hospitality | 1992 |
| Thurcroft Welfare Community Hall Limited | Health & social care | 2007 |
| Thurnscoe TAP Limited | Hospitality | 2022 |
| Tibusiso Temakholo Taseswatini Limited | Health & social care | 2016 |
| Tick Tock Cars Ltd | Transport & logistics | 2025 |
| Tickhill Labour & Plant Hire Ltd | Construction | 2014 |
| Tidmarsh Services Limited | Energy | 2024 |
| TIE Garden Ltd | Wholesale & retail | 2022 |
| TIE IT UP Theatre Limited | Education | 2016 |
| Tier 1 Affliates Limited | Information & communication | 2019 |
| Tierney & Co Solicitors Ltd | Professional & scientific | 2016 |
| Tifaset Limited | Health & social care | 2023 |
| Tiger Hobbies Limited | Wholesale & retail | 2004 |
| Tiger Leisure Holdings Ltd | Real estate | 2014 |
| Tiger Rail Ltd | Construction | 2019 |
| Tiggen Ltd | Professional & scientific | 2025 |
| Tight Nots Limited | Administrative & support | 2026 |
| Tikaldo Health Limited | Health & social care | 2025 |
| Tilda Beauty & Cosmetics Ltd | Wholesale & retail | 2022 |
| Tile Spot Ltd | Wholesale & retail | 2020 |
| Tile Trolley Ltd | Wholesale & retail | 2018 |
| TIM Foods Ltd | Hospitality | 2025 |
| TIM Neale Ltd | Information & communication | 2006 |
| TIM Walker Limited | Wholesale & retail | 2000 |
| Timber Garden Buildings Limited | Manufacturing | 2007 |
| Time Financial Management Ltd | Financial services | 2009 |
| Time for YOU (Lincolnshire) Limited | Administrative & support | 2015 |
| Time for YOU Grimbsy & Louth Limited | Households | 2021 |
| Time for YOU Sheffield Central Ltd | Other services | 2024 |
| Time Property Managment Limited | Real estate | 2013 |
| Timeisnow Entertainment Ltd | Wholesale & retail | 2019 |
| Timeless Consulting Limited | Information & communication | 2024 |
| Timeline Solutions Limited | Manufacturing | 2019 |
| Timothy Moxon Limited | Professional & scientific | 2017 |
| Timsec Limited | Construction | 2019 |
| Tingplus Consulting Ltd | Extraterritorial | 2024 |
| Tinkstv Limited | Information & communication | 2024 |
| Tiny Tots 2 Day Nursery (Rotherham) Ltd | Health & social care | 2018 |
| Tipito Ltd | Wholesale & retail | 2023 |
| Tipos Marine Services Limited | Manufacturing | 2011 |
| Tipton Commercials Limited | Wholesale & retail | 2023 |
| Tiramisu Cafe Ltd | Wholesale & retail | 2025 |
| Titan Civil Engineering Ltd | Construction | 2025 |
| Titan Flooring Limited | Construction | 2022 |
| Titan Interior Solutions Limited | Construction | 1992 |
| Titan Logistics (Yorkshire) Ltd | Transport & logistics | 2026 |
| Titan Rail Limited | Administrative & support | 2014 |
| Titans Catering Limited | Hospitality | 2021 |
| Titans Community Foundation | Education | 2005 |
| Titans Rugby Ltd | Arts & recreation | 2004 |
| Tixpro Limited | Wholesale & retail | 2026 |
| TJ Home Investments Limited | Real estate | 2016 |
| Tjcivils Ltd | Construction | 2020 |
| Tjfour Global Venture Ltd | Real estate | 2026 |
| TJM Rail Ltd | Construction | 2015 |
| TJS Property Group Ltd | Real estate | 2018 |
| TJS Property Management Ltd | Hospitality | 2021 |
| TK Recruitment Group Ltd | Professional & scientific | 2025 |
| TKH Holdings Ltd | Transport & logistics | 2024 |
| Tkhp Ltd | Real estate | 2019 |
| TL Business Support Services Limited | Extraterritorial | 2017 |
| TLB 24/7 Healthcare Ltd | Health & social care | 2015 |
| TLC Haulage Ltd | Transport & logistics | 2025 |
| TLC Passive Fire Ltd | Construction | 2019 |
| Tlgw Ltd | Real estate | 2022 |
| TLH Box Ltd | Arts & recreation | 2021 |
| TLR Cleaning LTS Ltd | Administrative & support | 2026 |
| TLR Development Ltd | Construction | 2025 |
| TLR Elec Ltd | Construction | 2026 |
| TLR Joinery Ltd | Construction | 2026 |
| TLR Solar Ltd | Construction | 2026 |
| TLT Micro Campers Ltd | Wholesale & retail | 2025 |
| TM Bars & Inns Ltd | Hospitality | 2024 |
| TM Care Services Ltd | Administrative & support | 2019 |
| TM Opticals Ltd | Wholesale & retail | 2025 |
| TM Pro-Serve Limited | Other services | 2020 |
| TM Safety and Compliance Ltd | Public administration | 2022 |
| TMA Travel Ltd | Transport & logistics | 2023 |
| TMB Investment Group Ltd | Professional & scientific | 2024 |
| TMG Club Limited | Financial services | 2020 |
| TMG Direct Limited | Financial services | 2016 |
| TMG Events & Marketing Limited | Professional & scientific | 2023 |
| TMG Financial Services Limited | Financial services | 2023 |
| TMG Protect Limited | Financial services | 2025 |
| TMG Rental Limited | Real estate | 2025 |
| TMM Group Limited | Construction | 2022 |
| TMS Auto Centre Ltd | Wholesale & retail | 2022 |
| TNA Recovery & Transportation Ltd | Transport & logistics | 2025 |
| Toastie Time Ltd | Hospitality | 2025 |