| THE Floral Linguist Ltd | Wholesale & retail | 2024 |
| THE Fountain (Consett) Ltd | Hospitality | 2024 |
| THE Frame House Limited | Manufacturing | 2000 |
| THE Godfeeder Ltd | Hospitality | 2021 |
| THE Golden Lion 2026 Limited | Hospitality | 2026 |
| THE Home Helpers Support Limited | Households | 2023 |
| THE Little Tractor Limited | Hospitality | 2020 |
| THE Nook Yoga & Wellbeing Ltd | Other services | 2025 |
| THE Nosh Group Ltd | Hospitality | 2024 |
| THE Oak Tree & Ember Co. Ltd | Real estate | 2025 |
| THE Old Surgery Limited | Real estate | 2009 |
| THE Pavilion PUB and Restaurant Ltd | Hospitality | 2019 |
| THE People BEE Ltd | Professional & scientific | 2025 |
| THE Ponteland Directory Limited | Information & communication | 2013 |
| THE Popcorn Factory Ltd | Manufacturing | 2024 |
| THE Ranch Events Ltd | Arts & recreation | 2025 |
| THE Redemption Holding Company (UK) Limited | Manufacturing | 2016 |
| THE Sarnie Salon Ltd | Hospitality | 2020 |
| THE Scotch Arms Ltd | Hospitality | 2022 |
| THE Setter and Pointer Project CIC | Other services | 2025 |
| THE Village Store Medway Ltd | Wholesale & retail | 2015 |
| THE Way Home Consulting Limited | Professional & scientific | 2021 |
| THE Wildlife ARK Trust | Professional & scientific | 2008 |
| THE Wonder Years Project CIC | Education | 2026 |
| THE Woof Pack With Carolyn Ltd | Other services | 2022 |
| Thecreativelandlord Limited | Real estate | 2019 |
| Thermal Spray Innovations Ltd | Professional & scientific | 2025 |
| Thick AS Bricks Ltd | Real estate | 2024 |
| Think Differently Education CIC | Education | 2023 |
| This IS ME Agency Ltd | Administrative & support | 2019 |
| Thiyaa Convenience Stores Limited | Wholesale & retail | 2025 |
| Thomas Swan & Co.Limited | Manufacturing | 1925 |
| Thomas Swan Holdings Limited | Financial services | 2015 |
| Thomson Media Limited | Information & communication | 2001 |
| Three Peaks Counselling Limited | Education | 2024 |
| Tileform (North) Ltd | Construction | 2022 |
| Tileform Ltd | Construction | 2017 |
| Tilly-Mints Cherubs Day Nursery Ltd | Health & social care | 2017 |
| TM Inspection Services Limited | Professional & scientific | 2019 |
| TMR Works Ltd | Professional & scientific | 2025 |
| TOB Heating & GAS Ltd | Construction | 2020 |
| TOB Renewables Ltd | Construction | 2024 |
| Tomlinson Farms Limited | Agriculture & fishing | 2014 |
| Tonss Ltd | Manufacturing | 2013 |
| Toothrag Studios Limited | Arts & recreation | 2022 |
| Top Lotus Ltd | Real estate | 2026 |
| Topaz Training & Development Ltd | Education | 2014 |
| Tora Ltd. | Administrative & support | 2005 |
| Torus Energy Services Ltd | Construction | 2024 |
| Totally RAD Inspection Ltd | Professional & scientific | 2024 |
| Track Sportswear Wholesale Ltd | Manufacturing | 2023 |
| Trades Consett Limited | Hospitality | 2018 |
| Trafalgar Rentals Ltd | Other services | 2024 |
| Train to Care Limited | Education | 2023 |
| Transform Interiors NE Ltd | Construction | 2025 |
| Transilience Accounting Ltd | Professional & scientific | 2016 |
| Treadnew Management Ltd | Administrative & support | 2015 |
| Tron Construction Group Limited | Construction | 2025 |
| Tron Ground Works Limited | Construction | 2025 |
| True Colour Digital Communications Limited | Information & communication | 2003 |
| True Granite Ltd | Manufacturing | 2017 |
| True Line Construction NE Ltd | Construction | 2026 |
| True Origins Ltd | Wholesale & retail | 2024 |
| Trufix Joinery Ltd | Construction | 2025 |
| Trust & Prosper Wealth Management Ltd | Professional & scientific | 2019 |
| Trzst Clayn Limited | Financial services | 2015 |
| TS Civils Ltd | Construction | 2025 |
| Turfcare Specialists Limited | Arts & recreation | 2001 |
| TW Marketplace Ltd | Wholesale & retail | 2025 |
| Twda. Ltd | Information & communication | 2000 |
| Twisted Scissors Washington Ltd | Other services | 2019 |
| Twlight Tools Limited | Wholesale & retail | 2025 |
| Twoseven Solutions Ltd | Information & communication | 2021 |
| TYK Trading Company Limited | Wholesale & retail | 2021 |
| Tynemanagement NE Limited | Real estate | 2015 |
| U Retreat Community Interest Company | Health & social care | 2018 |
| Ubique - Risk Management and Training Services Limited | Administrative & support | 2024 |
| UK Fire Security Engineering Ltd | Construction | 2024 |
| UKQ Residential Investments Limited | Real estate | 2018 |
| Ultimate Advisory Services Limited | Professional & scientific | 1978 |
| Ultimate Deals Direct Limited | Wholesale & retail | 2016 |
| Umaiza Tandoori Ltd | Hospitality | 2023 |
| Unichef, the National Chefs Union CIC | Administrative & support | 2018 |
| Unique Bespoke Joinery Ltd | Manufacturing | 2025 |
| Unite Securities Ltd | Administrative & support | 2019 |
| United Lettings Group Ltd | Real estate | 2018 |
| Unity Private Ltd | Wholesale & retail | 2025 |
| UP a Height Roofing NE Ltd | Construction | 2025 |
| Up-Level ME Ltd | Health & social care | 2020 |
| Urban Scope Integrated Limited | Wholesale & retail | 2022 |
| Utilibee Limited | Administrative & support | 2021 |
| Utility FM Ltd | Professional & scientific | 2018 |
| Utility France Limited | Professional & scientific | 2019 |
| V 4 Vape Ltd | Wholesale & retail | 2026 |
| Valour Health Ltd | Administrative & support | 2017 |
| Value Vending UK Ltd | Wholesale & retail | 2025 |
| Valued Academy Limited | Professional & scientific | 2013 |
| Vantage Incorporated Ltd | Hospitality | 2024 |
| Vault Ready Systems Limited | Administrative & support | 2016 |
| VC Leisure Ltd | Hospitality | 2026 |