| PR Mechanical Ltd | Professional & scientific | 2024 |
| Projectech Limited | Information & communication | 2026 |
| Property Wise UK25 Ltd | Real estate | 2025 |
| Q25 Ltd | Wholesale & retail | 2020 |
| Riverside Academy Education Service Ltd | Education | 2025 |
| Rose Cottage Community Hub CIC | Education | 2020 |
| S&C Property N.E. Ltd | Real estate | 2023 |
| S.W.E. Media Ltd | Professional & scientific | 2024 |
| Scope NDT Limited | Construction | 2014 |
| Sids Cinnamon Club Bar Ltd | Hospitality | 2023 |
| Sids Spice Club Restaurant Ltd | Hospitality | 2023 |
| SJ Beauty 33 Ltd | Other services | 2026 |
| Southern Star Management Services Limited | Professional & scientific | 2007 |
| ST Nics Management Ltd | Households | 2021 |
| Sweets & S'More Ltd | Wholesale & retail | 2025 |
| Syberg Trading Ltd | Wholesale & retail | 2022 |
| TAS Fabrications Limited | Manufacturing | 2023 |
| Teabrandu Ltd | Wholesale & retail | 2025 |
| Tees Aircraft Leasing LLP | | 2019 |
| Tenley Properties (Eastry) Limited | Construction | 2017 |
| Tenley Properties (Hammill) Limited | Construction | 2016 |
| TER (Aero) Limited | Manufacturing | 2014 |
| TFL Renewables Ltd | Construction | 2025 |
| THE Protection Group Ltd | Administrative & support | 2024 |
| Trimdon Construction Limited | Construction | 2025 |
| Trimdon Convenience Store Ltd | Wholesale & retail | 2024 |
| Tsibe Limited | Transport & logistics | 2016 |
| Tulle and Thread Ltd | Wholesale & retail | 2025 |
| Twelve Yards OUT Limited | Professional & scientific | 2017 |
| V.I.P. Taxis Durham Ltd | Transport & logistics | 2025 |
| Viper Goalkeeping Ltd | Manufacturing | 2017 |
| Virtus Scientia Blade Repair Limited | Manufacturing | 2025 |
| W D Jones Group Ltd. | Construction | 2015 |
| Walkers Consultancy NE Ltd | Public administration | 2020 |
| Weather Right Home Improvements Ltd | Construction | 2026 |
| Whitfield Building Contractors Ltd | Construction | 2023 |
| Williams Transport Ltd | Transport & logistics | 2026 |
| WM - Build Solutions Ltd | Construction | 2024 |
| Xenprop Ltd | Real estate | 2025 |
| YOU GET IT at Home Ltd | Professional & scientific | 2017 |
| Z & D Goodrum Ltd | Other services | 2019 |