| T C & C Ltd | Wholesale & retail | 2014 |
| Tamba Limited | Wholesale & retail | 2021 |
| TAN Lines Tanning Studio Ltd | Other services | 2024 |
| Tasty's Food Limited | Hospitality | 2021 |
| Techcypher Limited | Information & communication | 2023 |
| TEN80 Productions Ltd | Information & communication | 2009 |
| Terra Firma Ground Care Ltd | Administrative & support | 2023 |
| Terrone.Ndt Limited | Professional & scientific | 2023 |
| TFP 42 Ltd | Hospitality | 2026 |
| Thai on the Tyne Ltd | Hospitality | 2026 |
| Thai on Tyne Limited | Hospitality | 2026 |
| THE Agents Property Auction Limited | Real estate | 2009 |
| THE Badger Club | Health & social care | 2000 |
| THE Coffee Tree (Wylam) Limited | Hospitality | 2017 |
| THE Crafting Studios Ltd | Manufacturing | 2025 |
| THE Falcon PUB Prudhoe Ltd | Hospitality | 2026 |
| THE Highlander (Ovington) Management Company Limited | Real estate | 2007 |
| THE Lady and the Labrador Ltd | Wholesale & retail | 2022 |
| THE Little Cleaning Company (North East) Limited | Other services | 2017 |
| THE Lockey Collective Ltd | Professional & scientific | 2026 |
| THE Premier Plating Company (Northeast) Limited | Manufacturing | 2002 |
| THE Specials Laboratory Limited | Wholesale & retail | 1999 |
| THE Transport Guys Ltd | Transport & logistics | 2023 |
| The-Grill Garden Ltd | Hospitality | 2021 |
| Thirteen Property Investment Ltd | Real estate | 2025 |
| Thrive Neurodevelopmental Services Ltd | Professional & scientific | 2026 |
| Touch of Silver Ltd | Wholesale & retail | 2015 |
| Trailblazer Events Ltd | Hospitality | 2025 |
| Trevor Hutchinson LCV Ltd | Wholesale & retail | 2016 |
| Twenty One Industries Limited | Real estate | 2024 |
| Tyne Valley Appliance Centre Ltd. | Wholesale & retail | 1985 |
| Tyne Valley Counselling Services Ltd | Health & social care | 2026 |
| Tyne Valley Project Management Ltd | Professional & scientific | 2019 |
| Tynedale Tennis Academy CIC | Education | 2025 |
| Tynedesign Limited | Wholesale & retail | 2017 |
| Ubique Facilitator Services Ltd | Professional & scientific | 2023 |
| Unique Ubiquity Limited | Real estate | 2003 |
| Urban FOX Scripts Limited | Information & communication | 2026 |
| Vakratunda Ltd | Wholesale & retail | 2023 |
| Vmaria & Rawther UK Ltd | Health & social care | 2012 |
| Walnut Hair and Beauty Ltd | Other services | 2022 |
| Watson Wind Services Ltd | Manufacturing | 2025 |
| Watsons Builders Ltd | Construction | 2022 |
| Watsons Builders Northumberland Ltd | Construction | 2025 |
| Watsons of Prudhoe Hire Limited | Administrative & support | 2017 |
| Watsons of Prudhoe Ltd | Professional & scientific | 2010 |
| Wellbeing Hygiene Limited | Health & social care | 2025 |
| Whickham and District Motor Club Limited | Arts & recreation | 1977 |
| Wills Plus Ltd | Financial services | 2025 |
| Wilsondawg Media Marketing Limited | Wholesale & retail | 2025 |
| Wine Friendly Limited | Education | 2012 |
| Wylam Professional Services Ltd | Information & communication | 2008 |