| Sycamore Pro Installations Ltd | Construction | 2025 |
| Synergy Solutions (NE) Ltd | Construction | 2012 |
| Synergy VR Ltd | Information & communication | 2017 |
| T & D Leisure Limited | Arts & recreation | 2006 |
| T & M Newcastle Ltd | Hospitality | 2017 |
| T H Retail Ltd | Real estate | 2026 |
| T O'Sullivan Limited | Professional & scientific | 2002 |
| T Sport Vehicles NE Ltd | Wholesale & retail | 2024 |
| T-Boo Limited | Administrative & support | 2008 |
| T-Boo Retail Limited | Wholesale & retail | 2022 |
| Taggert Integrity Management Ltd | Professional & scientific | 2014 |
| Taggert Property Ltd | Construction | 2020 |
| Tahir Leisure Ltd | Other services | 2017 |
| Taizen Skin Therapy Centre Limited | Other services | 2010 |
| Take Five North East Limited | Construction | 2023 |
| Tale AS Old AS Tyne Limited | Arts & recreation | 2022 |
| Tamar Target Sports Limited | Wholesale & retail | 2019 |
| Tarn Project Management Ltd | Professional & scientific | 2024 |
| Tasc Environmental Services Limited | Health & social care | 2005 |
| Taste of Puglia Ltd | Manufacturing | 2025 |
| Tate Music Entertainment Ltd | Arts & recreation | 2024 |
| Taxable.Ai Ltd | Information & communication | 2026 |
| Taylor Mckenzie Design Consultants Ltd | Professional & scientific | 1995 |
| Taylor’S Property Holdings Limited | Real estate | 2024 |
| TCB Construction Ltd | Construction | 2009 |
| Tcimc Limited | Wholesale & retail | 2026 |
| TCM Industries Ltd | Wholesale & retail | 2024 |
| TDA Residential Ltd | Real estate | 2021 |
| Team Neurodiversity Ltd | Health & social care | 2022 |
| Team Player Studios Limited | Professional & scientific | 2023 |
| Teamwork Hair Design Limited | Other services | 2011 |
| Technical Options (Europe) Ltd | Professional & scientific | 1996 |
| Technical Options Limited | Extraterritorial | 2013 |
| Templars Designs Ltd | Information & communication | 2026 |
| Teri-Lee’S Ltd | Hospitality | 2021 |
| Tessa Westermeyer Ltd | Professional & scientific | 2021 |
| Teuxteux Ltd | Real estate | 2023 |
| Texpert Wind Limited | Professional & scientific | 2017 |
| TFC - Total Football Coaching Limited | Education | 2025 |
| Thai Massage Whitley Bay Ltd | Health & social care | 2022 |
| Thalassa Offshore Ltd | Transport & logistics | 2026 |
| That LB Properties Limited | Construction | 2003 |
| THE Arcade Apartments Management Company Limited | Real estate | 2009 |
| THE Avenue Cafe and Deli Limited | Hospitality | 2024 |
| THE Avenue Cafe Ltd | Hospitality | 2025 |
| THE Bay (Whitley Bay) Limited | Real estate | 2025 |
| THE Beacons Management Company (Seaton Delaval) Limited | Real estate | 2004 |
| THE COD POD Ltd | Hospitality | 2023 |
| THE Complete Kitchen Renovation Co. Ltd | Construction | 2017 |
| THE Confident Hiring Company Ltd | Professional & scientific | 2025 |
| THE Crafty Collection Ltd | Hospitality | 2022 |
| THE Crafty Lodge Ltd | Hospitality | 2021 |
| THE Cramlington Pantry Ltd | Hospitality | 2006 |
| THE Decorator GUY (NE) Limited | Construction | 2025 |
| THE Enterprise Academy Group CIC | Education | 2021 |
| THE European Concierge Ltd | Other services | 2020 |
| THE Exchange Building Ltd | Hospitality | 2021 |
| THE Female Panel Limited | Information & communication | 2026 |
| THE Flower Cabin (NE) Ltd | Wholesale & retail | 2023 |
| THE Food Bucket Ltd | Hospitality | 2017 |
| THE FOX at the Plough Ltd | Hospitality | 2024 |
| THE Fuel Station 1 Ltd | Hospitality | 2018 |
| THE Garden Shop Florist Ltd | Wholesale & retail | 2012 |
| THE Grange P O Limited | Other services | 2003 |
| THE Grove (Dipe Lane) Management Company Limited | Real estate | 2003 |
| THE Hair Shop (Whitley Bay) Limited | Other services | 2002 |
| THE Holiday Lady Limited | Administrative & support | 2018 |
| THE INK Effect Limited | Other services | 2023 |
| THE Intelligent Loggist System (Tils) Ltd | Information & communication | 2023 |
| THE Keel ROW Bookshop Ltd | Wholesale & retail | 2011 |
| THE Kitchen Mixer Limited | Hospitality | 2016 |
| THE Lighthouse Company Group Ltd | Real estate | 2026 |
| THE Limerence Limited | Education | 2025 |
| THE Lough RAN (2023) Ltd | Hospitality | 2023 |
| THE Mayfair Doncaster Ltd | Hospitality | 2022 |
| THE Mayfair Durham Ltd | Hospitality | 2025 |
| THE Mayfair Harrogate Ltd | Hospitality | 2024 |
| THE Merchants Tavern Ltd | Hospitality | 2020 |
| THE Microfibre Consortium Limited | Professional & scientific | 2018 |
| THE Panto Company (UK) Ltd | Arts & recreation | 2017 |
| THE Patterned Concrete Driveway Co. Limited | Construction | 2004 |
| THE Promenade Beach House Ltd | Hospitality | 2024 |
| THE Rochdale Principles Ltd | Professional & scientific | 2013 |
| THE Scarecrow London Ltd | Hospitality | 2022 |
| THE Security Inspectorate Limited | Extraterritorial | 2003 |
| THE Security Services Inspectorate Limited | Extraterritorial | 2003 |
| THE Signature Laundry Company Limited | Administrative & support | 2022 |
| THE Split Chimp Limited | Hospitality | 2016 |
| THE Spray Twins Limited | Construction | 2025 |
| THE Station Masters Centre | Education | 2013 |
| THE Sustenance SOC Ltd | Manufacturing | 2023 |
| THE Wardrobe Dept Ltd | Arts & recreation | 2023 |
| THE Wellsound Collective CIC | Information & communication | 2025 |
| THE Wildside- Learning Through Nature CIC | Education | 2021 |
| THE Willows (Fenham) Management Company Limited | Households | 2003 |
| THE Wooden Furniture Company Ltd | Manufacturing | 2024 |
| THE Woodsmith's Store Ltd | Wholesale & retail | 2011 |
| THE Yacht Group Limited | Real estate | 2025 |
| THE Yoga Station Limited | Arts & recreation | 2012 |
| THE YOU CAN Hub CIC | Health & social care | 2011 |