| Teamwork Development Trust CIC | Administrative & support | 2014 |
| Tease Hair UK Ltd | Other services | 2020 |
| Tech for Learning Ltd | Information & communication | 2024 |
| Tech GPT Ltd | Information & communication | 2024 |
| Tech Mobile Market Ltd | Wholesale & retail | 2025 |
| Tech SET Limited | Manufacturing | 1994 |
| Tech Spec Research Limited | Information & communication | 2026 |
| Techfit-Uk Limited | Professional & scientific | 2024 |
| Techno ALT Ltd | Information & communication | 2020 |
| Technogrid Limited | Manufacturing | 1994 |
| Technology Services Group Limited | Information & communication | 2003 |
| Techvision Robotics Ltd | Professional & scientific | 2024 |
| Tecno Lifts & Escalators UK Ltd | Extraterritorial | 2021 |
| Teddie and Co. Limited | Wholesale & retail | 2019 |
| TEE and TEE Global Limited | Hospitality | 2024 |
| TEE Realisiations Limited | Construction | 2023 |
| TEE2GREEN Competitions Limited | Other services | 2025 |
| Teelf Properties Ltd | Real estate | 2025 |
| Teemart Ltd | Wholesale & retail | 2025 |
| Tees Asbestos Removal Services Limited | Extraterritorial | 2009 |
| Tees Group Limited | Professional & scientific | 2009 |
| Tees Industrial Insulation Limited | Extraterritorial | 2009 |
| Teesside Anaesthesia Ltd | Health & social care | 2022 |
| Teesside Car Parts & Salvage Ltd | Wholesale & retail | 2019 |
| Teesside Regeneration Ltd | Real estate | 2006 |
| Telco NE Ltd | Transport & logistics | 2023 |
| Telford & Co Accountants Ltd | Professional & scientific | 2002 |
| Telford House Design Limited | Construction | 2020 |
| Telford Services Limited | Administrative & support | 2016 |
| Tellon Software Ltd | Information & communication | 2023 |
| Tempest Electrical and GAS Limited | Construction | 2026 |
| Templeton Brown Holdings Limited | Financial services | 2020 |
| Templeton Brown Limited | Real estate | 2011 |
| Templeton Brown Management Services Limited | Households | 2020 |
| Templeton Brown Properties Limited | Real estate | 2020 |
| TEN TEN Bistro Ltd | Hospitality | 2023 |
| Tender Hooligan Ltd | Wholesale & retail | 2022 |
| Teqpro IT Ltd | Other services | 2023 |
| Terra Anima Limited | Real estate | 2022 |
| Terrace Aesthetics Ltd | Other services | 2026 |
| Terrascope Studio Limited | Professional & scientific | 2025 |
| Tese Tese Ltd | Information & communication | 2026 |
| Tevuah Limited | Real estate | 2024 |
| TFM Holdings Limited | Financial services | 2006 |
| TFS Sports Ltd | Wholesale & retail | 2024 |
| TG Paving Ltd | Construction | 2021 |
| Tgvw Ltd | Manufacturing | 2024 |
| Thai Elephant Ltd | Hospitality | 2011 |
| Thandi (North East) Ltd | Hospitality | 2020 |
| That Login Company Ltd | Arts & recreation | 2024 |
| THE Eagle Gateshead Ltd | Hospitality | 2023 |
| THE 5STAR Foreman Ltd | Construction | 2025 |
| THE Academy @415 Professional Aesthetics Ltd | Extraterritorial | 2025 |
| THE Accounts Dept NE Limited | Professional & scientific | 2016 |
| THE Ades Global Ltd | Hospitality | 2025 |
| THE ALI Investment Group Limited | Real estate | 2024 |
| THE Anunnaki Messianic Gnostic Covenant Novus Ordo Seclorum Religion Ltd | Information & communication | 2026 |
| THE Automation Group Limited | Manufacturing | 1999 |
| THE Aviator Bistro Ltd | Hospitality | 2018 |
| THE Barber Shop NE Ltd | Other services | 2021 |
| THE Barn Cafe Whickham Ltd | Hospitality | 2022 |
| THE Beamish Mary Ltd | Hospitality | 2026 |
| THE Beauty LAB North East Ltd | Other services | 2024 |
| THE Bedsit Company Limited | Other services | 2003 |
| THE Belle VUE (LOW Fell) Limited | Hospitality | 2016 |
| THE Best Hand Car Wash Northeast Ltd | Other services | 2017 |
| THE Blue Door Project Limited | Health & social care | 2006 |
| THE Boomerang Academy Ltd | Public administration | 2021 |
| THE Brenkley Group Limited | Real estate | 2021 |
| THE Bridges Nursery Limited | Education | 2002 |
| THE Bridging Hub Limited | Financial services | 2023 |
| THE Brow and Beauté Lounge Ltd | Other services | 2023 |
| THE Business of Cleaning Limited | Education | 2022 |
| THE Carnell and Thompkins Consultancy Limited | Professional & scientific | 2003 |
| THE Carpet Place Limited | Wholesale & retail | 1995 |
| THE Cedars Academy Trust | Education | 2012 |
| THE Chamonix Clinic Ltd | Health & social care | 2007 |
| THE Change Team Ltd | Professional & scientific | 2015 |
| THE Chev Gateshead Ltd | Education | 2021 |
| THE Chippy Chappy Ltd | Hospitality | 2000 |
| THE Clay Commons Community Interest Company | Arts & recreation | 2025 |
| THE Cleaning Collaborative Ltd | Other services | 2025 |
| THE Cleaning Empire NE Ltd | Administrative & support | 2011 |
| THE Cloudie Kingdom Limited | Arts & recreation | 1997 |
| THE Clubshub Limited | Information & communication | 2024 |
| THE Cognition Group Ltd | Health & social care | 2000 |
| THE Color Island Group Ltd | Wholesale & retail | 2025 |
| THE Consett Shopping Centre Limited | Extraterritorial | 2007 |
| THE Continental Group Holdings Limited | Financial services | 2024 |
| THE Cozy Community Cafe CIC | Hospitality | 2026 |
| THE Crepe Stall Ltd | Hospitality | 2023 |
| THE Crescent Care Home Ltd | Health & social care | 2007 |
| THE Crest Group (NE) Limited | Real estate | 2019 |
| THE Cricketers Arms (Bill Quay) Limited | Hospitality | 2016 |
| THE Cricketers' (Bill Quay) Ltd | Hospitality | 2025 |
| THE Cyrenians Ltd | Hospitality | 1970 |
| THE Date Film Limited | Information & communication | 2025 |
| THE Deli (North East) Ltd | Hospitality | 2019 |
| THE Delivery MAN Ltd | Transport & logistics | 2019 |
| THE Dental Room Belford Limited | Administrative & support | 2017 |