| Technical NE Ltd | Construction | 2019 |
| Telnor Consulting Ltd | Professional & scientific | 2022 |
| Tenter Properties Limited | Real estate | 2019 |
| THE Accountancy Academy Limited | Professional & scientific | 2000 |
| THE Bedlington Office Ltd | Real estate | 2026 |
| THE Bernicia Foundation | Financial services | 2019 |
| THE Blyth Office Limited | Real estate | 2026 |
| THE Breakfast Club EST 2025 Ltd | Hospitality | 2025 |
| THE Centre for Search Research | Professional & scientific | 1997 |
| THE Colour Nerds Limited | Education | 2025 |
| THE Doll House NE Limited | Other services | 2020 |
| THE Elephant Ashington Ltd | Hospitality | 2025 |
| THE Factory (Ashington) Ltd | Hospitality | 2018 |
| THE Foxcover Ashington Ltd | Hospitality | 2023 |
| THE G20 Health and Development Partnership Ltd | Extraterritorial | 2020 |
| THE Gandiva Legacy Limited | Wholesale & retail | 2025 |
| THE Grand Public House Limited | Hospitality | 2008 |
| THE Haunted Headquarters Ltd | Wholesale & retail | 2026 |
| THE Healers Clinic Ltd | Health & social care | 2024 |
| THE Historical Living Company Ltd | Arts & recreation | 2022 |
| THE Marine Shepherd Ltd | Professional & scientific | 2016 |
| THE Morpeth Arms Limited | Hospitality | 2021 |
| THE Morpeth Office Limited | Real estate | 2026 |
| THE Nail Bar HMD Ltd | Other services | 2023 |
| THE Newbiggin DEN Limited | Health & social care | 2022 |
| THE Northumberland Tartan Company Limited | Wholesale & retail | 2002 |
| THE Paint Shop (Ashington) Limited | Wholesale & retail | 2003 |
| THE Piano Hub Ltd | Education | 2020 |
| THE Premier Club (Ashington) Limited | Hospitality | 2004 |
| THE Sawdust Maker Ltd | Manufacturing | 2025 |
| THE Secret Salon at Real Fitness Ltd | Wholesale & retail | 2022 |
| THE Station Lounge Limited | Hospitality | 2012 |
| THE TAN House NE63 Ltd | Other services | 2026 |
| THE Tipsy Bean Ltd | Hospitality | 2025 |
| THE Tyneside Society of Model and Experimental Engineers Limited | Professional & scientific | 2000 |
| THE Wallsend Office Limited | Real estate | 2026 |
| THE Works Digital (North East) Limited | Professional & scientific | 2014 |
| Thornton Accountancy Ltd | Professional & scientific | 2023 |
| Thornton Brothers Holdings Limited | Financial services | 2022 |
| TIP Top Tyres (Ashington 2019) Limited | Wholesale & retail | 2019 |
| Tmdrt Online Ltd | Wholesale & retail | 2026 |
| Tokyo Campers Ltd | Wholesale & retail | 2024 |
| Tokyo Motors NE Ltd | Wholesale & retail | 2024 |
| Tony Dodds Consulting Ltd | Real estate | 2016 |
| Topjam Limited | Financial services | 2026 |
| Torbay 2023 Ltd | Construction | 2023 |
| Totalsmt Ltd | Manufacturing | 2022 |
| Trade Tech (Northeast) Ltd | Wholesale & retail | 2014 |
| Trichley Ltd | Other services | 2026 |
| Triple B Bolting Ltd | Manufacturing | 2014 |
| Trivselhus Construction Limited | Construction | 2019 |
| Trivselhus UK Holdings Limited | Administrative & support | 2021 |
| Trivselhus UK Limited | Construction | 2015 |
| Trowelled UP Plastering Ltd | Construction | 2026 |
| Troy Hamilton 62 Limited | Professional & scientific | 2013 |
| True North Tileworks Ltd | Construction | 2026 |
| Ttep Lynemouth Power Ltd | Energy | 2011 |
| Tustain Motors Limited | Wholesale & retail | 2009 |
| Twhistle CIC | Arts & recreation | 2011 |
| Twin Interiors Construction Ltd | Construction | 2026 |
| Tyne & Manor Estates Limited | Real estate | 2025 |
| Typically-Diverse Ltd | Administrative & support | 2023 |
| UK Seals & Polymers Limited | Wholesale & retail | 2002 |
| UK Secret Suites Ltd | Hospitality | 2024 |
| UK Website Design Ltd | Information & communication | 2019 |
| Umbrella Lettings Ltd | Real estate | 2017 |
| Utex Europe Limited | Manufacturing | 2017 |
| Utter Clutter Ltd | Wholesale & retail | 2015 |
| V Salon Hairdressing Limited | Other services | 2008 |
| V.R.M. Security Systems Limited | Information & communication | 1989 |
| Vaibav Retails UK Ltd | Wholesale & retail | 2016 |
| Venetian Supply Limited | Wholesale & retail | 2020 |
| VI Kitchen Ltd | Manufacturing | 2016 |
| VIP Barber NE Ltd | Other services | 2025 |
| VIP Barber Shop Ltd | Other services | 2025 |
| Viveca Biomed Limited | Manufacturing | 2017 |
| VO2 MAX Racing Events Limited | Wholesale & retail | 2009 |
| VR Food & Wine Ltd | Wholesale & retail | 2023 |
| W DEL Fabrication & Inspection Limited | Manufacturing | 2014 |
| W E Communicate Limited | Water & waste | 2007 |
| W J B Technical Services Ltd | Professional & scientific | 2015 |
| W.H.Hillerby & Sons Limited | Construction | 1956 |
| W.H.Sanderson & Sons Limited | Agriculture & fishing | 1963 |
| Wansbeck Caravan Specialists Limited | Manufacturing | 2023 |
| Wansbeck Garden Centre Limited | Wholesale & retail | 2015 |
| Wansbeck Gymnastics and Trampolining Club | Arts & recreation | 2015 |
| Wansbeck Plastics Limited | Other services | 2009 |
| Wansbeck Tandoori Takeaway Ltd | Hospitality | 2015 |
| Warmest Group Ltd | Construction | 2022 |
| Warren Innovations and Designs Ltd | Professional & scientific | 2025 |
| Warrich Construction Ltd | Construction | 2019 |
| Wasp NE Ltd | Administrative & support | 2023 |
| Watbus | Transport & logistics | 1998 |
| Watson Mechanical Engineering Services Limited | Manufacturing | 2016 |
| WD Homes Limited | Hospitality | 2003 |
| Weathermann Structures Ltd | Construction | 2010 |
| Web Network Ltd | Information & communication | 2022 |
| Web Penguin Ltd | Information & communication | 2024 |
| Well Handled Limited | Health & social care | 2009 |
| West HEN Dance Parties Ltd | Arts & recreation | 2022 |