| TCB Healthcare Ltd | Health & social care | 2025 |
| Tcci Limited | Wholesale & retail | 2003 |
| TCD Logistics Ltd | Transport & logistics | 2015 |
| TCL Signallling Ltd. | Administrative & support | 2007 |
| TCR Health & Safety Limited | Administrative & support | 2024 |
| TCV David Ltd | Health & social care | 2026 |
| TCW Tech Consulting Ltd | Information & communication | 2023 |
| TD Elliott Property Ltd | Real estate | 2022 |
| TD Jordan Ltd | Transport & logistics | 2026 |
| TD Smart Properties Ltd | Real estate | 2020 |
| TD Trucking Limited | Transport & logistics | 2024 |
| TDA Quality Services Ltd | Administrative & support | 2021 |
| TDD Management Limited | Professional & scientific | 2018 |
| TDH Fabrications Ltd | Manufacturing | 2016 |
| TDI4DRIVING Ltd | Education | 2017 |
| Tdiuk Ltd | Information & communication | 2026 |
| TDR Holdings Limited | Real estate | 2026 |
| Tdrives Limited | Transport & logistics | 2025 |
| TDS Holdings Limited | Hospitality | 2026 |
| TDS Investments Ltd | Construction | 2024 |
| Tdsigns Ltd | Professional & scientific | 2024 |
| Tea & Donuts Ltd | Hospitality | 2026 |
| Teach in Limited | Administrative & support | 2018 |
| Teacher's Assistant Ltd | Education | 2025 |
| Teachlondon Limited | Administrative & support | 2009 |
| Teachloop Ltd | Information & communication | 2025 |
| Teachouse Education Services LLP | | 2019 |
| Teachtastic Educational Supplies Limited | Wholesale & retail | 2016 |
| Teal Chokes Limited | Manufacturing | 2018 |
| Team 1101 Limited | Information & communication | 2022 |
| Team 777 Limited | Construction | 2007 |
| Team BAX Ltd | Information & communication | 2024 |
| Team GF Shred Ltd | Education | 2022 |
| Team HBP Limited | Construction | 2025 |
| Team PLR Construction Ltd | Construction | 2024 |
| Team PLR Ltd | Construction | 2014 |
| Team Pristine Ltd | Households | 2013 |
| Team Properties and Renovations Ltd | Real estate | 2023 |
| Team Pubs and Bars Limited | Hospitality | 2017 |
| Team PWR Ltd | Education | 2025 |
| TEAMDOMIN8 Ltd | Education | 2023 |
| Teamwear Matters Ltd | Wholesale & retail | 2025 |
| Teamz Logistics Limited | Transport & logistics | 2024 |
| Teasdale Electrical Ltd | Construction | 2026 |
| Teawell Limited | Information & communication | 2025 |
| TEB Construction 24/7 Ltd | Construction | 2025 |
| TEB Maintenance Ltd | Construction | 2025 |
| Tebbs & Tebbs Ltd | Real estate | 2024 |
| Tec-Edge Ltd | Wholesale & retail | 2016 |
| Tec-Nick Autos Ltd | Wholesale & retail | 2012 |
| Tec-Nick Car Sales Ltd | Wholesale & retail | 2019 |
| Teca-Print (UK) Limited | Professional & scientific | 1988 |
| Tech & Support Ltd | Other services | 2026 |
| Tech Flint Ltd | Professional & scientific | 2016 |
| Tech Guarding Ltd | Administrative & support | 2022 |
| Tech Hub S5 Limited | Wholesale & retail | 2025 |
| Tech Onsite Ltd | Information & communication | 2013 |
| Tech Protections Limited | Information & communication | 2026 |
| Tech Source International Ltd | Wholesale & retail | 2022 |
| Tech Stainless Global Limited | Professional & scientific | 2016 |
| Tech Ticklers Ltd | Information & communication | 2025 |
| Tech Toppers Ltd | Manufacturing | 2024 |
| Tech Town Trading Limited | Wholesale & retail | 2025 |
| Tech-Control Automation Ltd | Professional & scientific | 2026 |
| Tech-Star Yorkshire Limited | Real estate | 2017 |
| Techbridge Engineering Limited | Information & communication | 2024 |
| Techbridge Holdings Ltd | Information & communication | 2025 |
| Techbuildr Ltd | Administrative & support | 2021 |
| Techcharger Ltd | Information & communication | 2024 |
| Teched Venture Limited | Wholesale & retail | 2024 |
| Techfist Limited | Information & communication | 2019 |
| Techform (Sheffield) Limited | Manufacturing | 2009 |
| Techform Properties Limited | Manufacturing | 2016 |
| Techlogico Limited | Transport & logistics | 2013 |
| Techni-Call Solutions Limited | Information & communication | 1998 |
| Techni-Form EDM Limited | Manufacturing | 2013 |
| Technical Director Ltd | Other services | 2013 |
| Technical Display Consortium Limited | Other services | 2000 |
| Technical Display Management Limited | Financial services | 2024 |
| Technical Energy UK Ltd | Manufacturing | 2008 |
| Technical Refractory Solutions Ltd | Professional & scientific | 2010 |
| Technical Service Associates Limited | Manufacturing | 1990 |
| Technics Supplement Services Ltd | Water & waste | 2024 |
| Technique Painting & Decorating Ltd | Construction | 2023 |
| Techniserve Limited | Construction | 2002 |
| Technohype Ltd | Wholesale & retail | 2020 |
| Technostar for Trading and Equipment Office Supplies Ltd | Manufacturing | 2021 |
| Technowise Solutions Limited | Information & communication | 2014 |
| Techprojx Ltd | Information & communication | 2014 |
| Techtechi Limited | Information & communication | 2015 |
| Techvia Ltd | Information & communication | 2024 |
| Techvistra Ltd | Wholesale & retail | 2026 |
| Tecni-Block Limited | Construction | 2001 |
| Tecoset Ltd | Professional & scientific | 2024 |
| Tecsec Services Ltd | Information & communication | 2006 |
| TED Williams (Sheffield) Limited | Wholesale & retail | 1951 |
| Tedbar Tinker Group Limited | Professional & scientific | 2014 |
| Tedbar Tinker Hire Limited | Professional & scientific | 2005 |
| Tedbar Van Hire Limited | Administrative & support | 2024 |
| Teddy's CUT Limited | Administrative & support | 2010 |