| THE Paint and Stain Co Limited | Construction | 2026 |
| THE Phone Shop Middlesbrough Ltd | Other services | 2024 |
| THE Physio Hub Limited | Health & social care | 2017 |
| THE Picture Book Studio Limited | Professional & scientific | 2009 |
| THE Place in the Park, Hartlepool Limited | Hospitality | 2025 |
| THE Potting Shed North East Limited | Education | 2003 |
| THE Prezes Ltd | Professional & scientific | 2021 |
| THE Print Factory Holdings Limited | Professional & scientific | 2008 |
| THE Property Investment Coach Ltd | Administrative & support | 2024 |
| THE Property Supermarket Hartlepool Limited | Real estate | 2007 |
| THE Protein Stop UK Ltd | Wholesale & retail | 2024 |
| THE Remap GUY Ltd | Wholesale & retail | 2025 |
| THE Robertson Portfolio Limited | Real estate | 2018 |
| THE S&F Empire Limited | Real estate | 2018 |
| THE Secret Garden by Michelle Ltd | Hospitality | 2023 |
| THE Sequoia Brand Limited | Wholesale & retail | 2017 |
| THE Sewing Junction Limited | Wholesale & retail | 2021 |
| THE Shop @ Hartfields Ltd | Wholesale & retail | 2019 |
| THE Simple Weigh Ltd. | Wholesale & retail | 2018 |
| THE Social Path Group Ltd | Information & communication | 2025 |
| THE Station Garden Project Limited | Real estate | 2021 |
| THE Stockton Publican Ltd | Hospitality | 2021 |
| THE Summerhill Group Limited | Professional & scientific | 2016 |
| THE Sun Inn (Stockton) Ltd | Hospitality | 2017 |
| THE Sweet Shack NE Ltd | Wholesale & retail | 2026 |
| THE Sweet Shop Ltd | Hospitality | 2024 |
| THE Sweetest Sensation Ltd | Wholesale & retail | 2025 |
| THE Sycamores Residents Association Limited | Households | 1989 |
| THE Tangrams Ltd | Information & communication | 2026 |
| THE Thrive Hive North East C.I.C. | Arts & recreation | 2023 |
| THE Toolbox Supply Company Limited | Wholesale & retail | 2011 |
| THE Toolroom Ltd | Manufacturing | 2021 |
| THE Watch Group Limited | Real estate | 1999 |
| THE Wedding Chapel Limited | Information & communication | 2022 |
| THE Wright Look Aesthetics Ltd | Health & social care | 2025 |
| THE YW Investment Company Limited | Real estate | 2011 |
| Thebigleague CIC | Other services | 2014 |
| Theia Radiology Services Limited | Health & social care | 2022 |
| Theitapprentice CIC | Education | 2024 |
| Theiva & Mercy Ltd | Real estate | 2025 |
| Thesomedayclub Limited | Wholesale & retail | 2025 |
| THH 345 Ltd | Real estate | 2024 |
| Think First Fire Engineering Consultancy Ltd | Professional & scientific | 2023 |
| Thiyash Holding Limited | Financial services | 2024 |
| Thiyash Limited | Wholesale & retail | 2018 |
| Thomas J Clark Logistics Ltd | Transport & logistics | 2025 |
| Thomas Melrose Publishing Ltd | Hospitality | 2017 |
| Thomas Witter Carpets Limited | Extraterritorial | 2013 |
| Thompson and Co Ltd | Professional & scientific | 2009 |
| Thompson NE Ltd | Construction | 2020 |
| Thompson Tiling Limited | Construction | 2013 |
| Thompson Ventures Limited | Other services | 2014 |
| Thompsons Plastering & (Tiling) Ltd | Construction | 2009 |
| Thready Engineering Ltd | Manufacturing | 2017 |
| THREE7MARKETING Ltd | Information & communication | 2025 |
| Thrive Assessments Limited | Education | 2022 |
| Throston Limited | Wholesale & retail | 1973 |
| Tickety BOO Seafood Inc Limited | Wholesale & retail | 2026 |
| Tide 25 Limited | Wholesale & retail | 2016 |
| TIE the Knot Ltd | Information & communication | 2022 |
| Tilly Bailey & Irvine LLP | | 2005 |
| Time Electrical Services Ltd | Construction | 2022 |
| TIME4CHILD Ltd | Wholesale & retail | 2021 |
| TIMEANDAGAIN25 Ltd | Wholesale & retail | 2024 |
| Tint Team Limited | Manufacturing | 2026 |
| Tipsy NE Ltd | Hospitality | 2024 |
| Tjcmetals Ltd | Manufacturing | 2025 |
| TJD Solutions Limited | Professional & scientific | 2025 |
| TJG Ventures Limited | Construction | 2012 |
| Tjjf Ltd | Transport & logistics | 2023 |
| TJS PC Services Limited | Administrative & support | 2013 |
| Tkash International Limited | Wholesale & retail | 2019 |
| TLC Homes Yorkshire Limited | Real estate | 2022 |
| TLG (SB) Holdings Limited | Financial services | 2023 |
| TM Darling and SON 2023 Limited | Agriculture & fishing | 2023 |
| TM Measurements Limited | Professional & scientific | 2017 |
| TMD Friction Centenary Trustee Limited | Education | 1999 |
| TMD Friction UK Limited | Manufacturing | 2001 |
| TMD Friction UK Trustee Limited | Professional & scientific | 2000 |
| Tmdin Limited | Professional & scientific | 2025 |
| TMJ Legal Services Limited | Professional & scientific | 2011 |
| Todd P Ltd | Construction | 2026 |
| TOM Hunt Markets Ltd | Hospitality | 2010 |
| TOM Lowther Painting Contractors Limited | Construction | 2022 |
| Tom's Feast Ltd | Hospitality | 2014 |
| Tomcreevy Ltd | Manufacturing | 2026 |
| Tomson Developments Limited | Construction | 2018 |
| Tony Moore Consultancy Limited | Administrative & support | 2007 |
| Tony Oliver Construction Ltd | Construction | 2024 |
| Tonys Parmesan Hartelpool Ltd | Hospitality | 2024 |
| Top Barbers Hartlepool Ltd | Other services | 2025 |
| Top Brass Limited | Wholesale & retail | 2018 |
| Top Talent Partners Ltd | Administrative & support | 2024 |
| Topspec Decorating Services Ltd | Construction | 2026 |
| Torridon Contractor 1 Limited | Construction | 2024 |
| Torus International Limited | Wholesale & retail | 2021 |
| Total Digital Group Limited | Education | 2016 |
| Total Maintenance (North East) Ltd | Construction | 2008 |
| Totalfd Limited | Professional & scientific | 2015 |
| Touch Energy Limited | Construction | 2020 |