| TMD Engineering (NE) Ltd | Professional & scientific | 2022 |
| Tmeh Consultancy Ltd | Health & social care | 2023 |
| Tmex Trading Ltd | Hospitality | 2016 |
| TMP Sales Ltd | Wholesale & retail | 2025 |
| TMU Private Limited | Health & social care | 2022 |
| TMY Properties Limited | Real estate | 2024 |
| TOD Global Trade Ltd | Professional & scientific | 2020 |
| Tofa Wear Ltd | Wholesale & retail | 2019 |
| Together Middlesbrough and Cleveland | Administrative & support | 2014 |
| Togo Business UK Ltd | Manufacturing | 2024 |
| Tohren Limited | Wholesale & retail | 2020 |
| TOM Comms Ltd | Construction | 2020 |
| TOM Leng Engineering Limited | Construction | 2019 |
| TOM Relph Electrical Services Ltd | Construction | 2024 |
| Tom&Raf Construction Ltd | Construction | 2025 |
| Toma Florea Logistics Limited | Transport & logistics | 2026 |
| Tomcan Clean Commercial Limited | Transport & logistics | 2023 |
| Tomcan Clean Limited | Administrative & support | 2021 |
| Tomcan Property Limited | Real estate | 2020 |
| Tomlinson and Douthwaite Property Ltd | Real estate | 2020 |
| Tomos Welding Ltd | Construction | 2019 |
| Tony Donachie Engineering Services Ltd | Professional & scientific | 2024 |
| Tony Rogers Financial Management Limited | Financial services | 2006 |
| Tonyandurai Ltd | Construction | 2023 |
| Top 1 Hand Car Wash Ltd | Administrative & support | 2026 |
| Top Barbers Northeast Ltd | Other services | 2024 |
| Top Corner Day Care Limited | Health & social care | 2017 |
| Top Hand Car Wash NE Ltd | Administrative & support | 2021 |
| Top Nail and Beauty Limited | Other services | 2025 |
| Top Wash SH Ltd | Administrative & support | 2025 |
| Topbuild Limited | Professional & scientific | 1993 |
| Topherson Limited | Professional & scientific | 2013 |
| Topshop Convenience Store Ltd | Wholesale & retail | 2019 |
| Torawebs Limited | Information & communication | 2011 |
| Tore's Restaurant Limited | Hospitality | 2013 |
| Torino Pizzeria NE Ltd | Hospitality | 2023 |
| Tortuga Lettings Ltd | Real estate | 2023 |
| Total Landscapes NE Limited | Administrative & support | 2026 |
| Total Protection Services N.E. Limited | Administrative & support | 2023 |
| Total Windows North East Limited | Manufacturing | 2011 |
| Totalspark Solutions Ltd | Other services | 2025 |
| Totimo Care & Support Services Limited | Transport & logistics | 2022 |
| Touchtote Systems Ltd | Information & communication | 2011 |
| Town & Country Property Auctions North East Limited | Real estate | 2022 |
| Town and Country Tyres 2012 Ltd | Wholesale & retail | 2014 |
| TP Welding Inspection Ltd | Professional & scientific | 2023 |
| TPE Properties Ltd | Real estate | 2024 |
| TPL Aluminium Doors UK Limited | Construction | 2019 |
| TPL Aluminium Panels Limited | Construction | 2019 |
| TPL Trade Limited | Construction | 2014 |
| Tplca Limited | Professional & scientific | 2016 |
| TPW by Grandma’S HUT Ltd | Wholesale & retail | 2024 |
| TR Instrumentation Services Limited | Professional & scientific | 2023 |
| TR Photography Ltd | Professional & scientific | 2026 |
| Trackside Developments Ltd | Wholesale & retail | 2025 |
| Trade Car Teesside Ltd | Wholesale & retail | 2025 |
| Trade Cars Eston Ltd | Wholesale & retail | 2026 |
| Trade Hair Wholesale by Stephanie Ltd | Wholesale & retail | 2020 |
| Trade Parts Acklam Ltd | Wholesale & retail | 2024 |
| Trade Plus Holdings Ltd | Wholesale & retail | 2019 |
| Trade Site Services Limited | Administrative & support | 2019 |
| Trade Windows and Conservatories Limited | Construction | 2019 |
| TRADEFLOORING4YOU Limited | Wholesale & retail | 2010 |
| Trademarkgold Ltd | Wholesale & retail | 2025 |
| Trading Moyo Ltd | Wholesale & retail | 2024 |
| Trading North East Limited | Wholesale & retail | 2012 |
| Traditionally English Limited | Wholesale & retail | 2003 |
| Trafford Energy Limited | Energy | 2009 |
| Trained by JP Clothing Ltd | Wholesale & retail | 2019 |
| Trained by JP Ltd | Arts & recreation | 2015 |
| Trainor Technical Services Limited | Mining & quarrying | 2015 |
| Transitions 17 Community Interest Company | Education | 2018 |
| Transitions Education Ltd | Education | 2022 |
| Tranter Rigging Services Ltd | Professional & scientific | 2025 |
| Tras Consulting Ltd | Information & communication | 2015 |
| TRAVEL4LESS Ltd | Extraterritorial | 2024 |
| Travelyfe Ltd | Administrative & support | 2020 |
| Traverse Logistics Limited | Transport & logistics | 2025 |
| TRB Training Solutions Ltd | Public administration | 2023 |
| TRD Joinery Ltd | Construction | 2026 |
| Treehaus Interiors Ltd | Wholesale & retail | 2026 |
| Treesnet Limited | Information & communication | 2013 |
| Trek Healthcare Services Limited | Public administration | 2023 |
| Trendproc Limited | Information & communication | 2011 |
| Trendthread Ltd | Wholesale & retail | 2024 |
| Trenzia Ltd | Wholesale & retail | 2025 |
| Trevelyan Associates Limited | Professional & scientific | 2019 |
| TRF Electrical Services Ltd | Construction | 2026 |
| Triads Estates Ltd | Real estate | 2026 |
| Triage Centrum Limited | Administrative & support | 2014 |
| Tribe African & Caribbean Superstores Limited | Wholesale & retail | 2022 |
| Tribus Partnership Ltd | Professional & scientific | 2023 |
| Tricoredevelopementgroup Ltd | Construction | 2026 |
| Trident Lounge Ltd | Hospitality | 2026 |
| Trident Protection Group Limited | Information & communication | 2024 |
| Trigiene Limited | Wholesale & retail | 2015 |
| Trinity Centre (North Ormesby) C.I.C. | Health & social care | 2016 |
| Trinityplus Healthcare Services Ltd | Administrative & support | 2018 |
| Trio Foodservice Ltd | Wholesale & retail | 2014 |
| Trionix Techworks Limited | Wholesale & retail | 2025 |