| TC Compliance Ltd | Professional & scientific | 2021 |
| TC Talent Ltd | Administrative & support | 2025 |
| TCM Caravan & Motorhome Service Centre Limited | Wholesale & retail | 2017 |
| Teare Holdings Limited | Extraterritorial | 2021 |
| Tecd North East Limited | Construction | 2017 |
| Technical Construction Solutions Ltd | Construction | 2023 |
| Tees Barrage Salon Limited | Other services | 2019 |
| Teescraft Engineering Limited | Manufacturing | 1981 |
| Teesdale Cheesemakers Ltd | Hospitality | 2013 |
| Teesside CDM Safety Solutions Ltd | Professional & scientific | 2022 |
| Teisa Limited | Professional & scientific | 2018 |
| Temptations 1 Limited | Extraterritorial | 2019 |
| TEN Group Construction & Groundwork’S Ltd | Construction | 2019 |
| Tenderarm Limited | Construction | 2023 |
| Thames to Tyne Properties Ltd | Real estate | 2025 |
| THE Ac/Cc Group Limited | Financial services | 2026 |
| THE Association for Cultural Enterprises | Other services | 2008 |
| THE Auckland Project | Arts & recreation | 2012 |
| THE Bake Bishop Auckland Ltd | Hospitality | 2024 |
| THE Barkary Limited | Agriculture & fishing | 2023 |
| THE Belt Open Space Management Co Limited | Households | 2006 |
| THE Black Bull Durham Ltd | Hospitality | 2025 |
| THE Bluebird Boutique Ltd | Wholesale & retail | 2022 |
| THE Brown Horse Hotel Ltd | Hospitality | 2023 |
| THE Business Growth Point Limited | Professional & scientific | 2015 |
| THE Candle Stop Ltd | Manufacturing | 2023 |
| THE Cardboard Kingdom Limited | Extraterritorial | 2014 |
| THE Chimps Adventure Ltd | Construction | 2015 |
| THE Clothing Alteration Company Bishop Auckland Ltd | Other services | 2025 |
| THE Copse (Marton-Cum-Grafton) Management Company Limited | Households | 2019 |
| THE Decor Group Ltd | Wholesale & retail | 2010 |
| THE DUN COW Witton-Le-Wear Ltd | Hospitality | 2025 |
| THE Elms (Bishop Auckland) Management Company Limited | Real estate | 1996 |
| THE Enchanted Ember Limited | Wholesale & retail | 2025 |
| THE Gateway (Handsworth) Management Co Ltd | Households | 2006 |
| THE Golden Lion (Weardale) Ltd | Hospitality | 2018 |
| THE Good Arch Limited | Other services | 2021 |
| THE Granary (Eggborough) Management Company Limited | Households | 2014 |
| THE Grangeside Group Limited | Professional & scientific | 2016 |
| THE Green Tree Public House Ltd | Hospitality | 2026 |
| THE Green Westgate Limited | Hospitality | 2026 |
| THE Grey Bull Stanhope Limited | Hospitality | 2018 |
| THE Hedgehog Bakery LLP | | 2018 |
| THE Hockaday Family Investment Company Ltd | Administrative & support | 2024 |
| THE Lamp Room Limited | Hospitality | 2012 |
| THE Langdon Beck Limited | Hospitality | 2023 |
| THE Mortgage Brokerage (UK) Limited | Financial services | 2014 |
| THE MOT GUY Limited | Wholesale & retail | 2022 |
| THE Moving Forward Project Ltd | Health & social care | 2024 |
| THE Newmarket (TOW Law) Ltd | Hospitality | 2025 |
| THE Nexus Interchange Ltd | Administrative & support | 2025 |
| THE North East Nata Company Ltd | Hospitality | 2026 |
| THE North East Outdoor Pursuit Centre Ltd | Arts & recreation | 2012 |
| THE Old Mission Hall Ltd | Hospitality | 2020 |
| THE Olde Young Tea House Limited | Hospitality | 2010 |
| THE Outdoor Clothing Company Ltd | Wholesale & retail | 2025 |
| THE Paddock Residents Management Company Limited | Real estate | 2008 |
| THE Pastures (Knaresborough) Management Company Limited | Households | 2016 |
| THE Penny Press Holdings Limited | Arts & recreation | 2025 |
| THE Private Training Suite Limited | Arts & recreation | 2025 |
| THE Raby Hunt Restaurant Holdings Ltd | Hospitality | 2023 |
| THE Raby Hunt Restaurant Ltd | Hospitality | 2009 |
| THE Saxon Inn(Escomb) Limited | Hospitality | 2021 |
| THE Sidings (Hull) Management Company Limited | Households | 2013 |
| THE Stables Holiday LET Ltd | Hospitality | 2021 |
| THE Tannery Management Company Limited | Households | 2013 |
| THE Taste Creators Limited | Manufacturing | 2021 |
| THE Taurus Corporation Limited | Professional & scientific | 2007 |
| THE Taxation Hub Ltd | Professional & scientific | 2023 |
| THE Three Tuns (N.E) Limited | Hospitality | 2025 |
| THE Weardale Railway Trust | Transport & logistics | 1996 |
| THE Weavers Management Company Limited | Real estate | 2020 |
| THE Welcome PUB Company Ltd | Hospitality | 2023 |
| THE Wellbeing GP Ltd | Professional & scientific | 2020 |
| THE Wiggly Path CIC | Education | 2023 |
| THE Yorkshire Gelato Company Limited | Manufacturing | 2011 |
| THE Zurbaran Trust | Arts & recreation | 2011 |
| Theia Talos Consulting Ltd | Professional & scientific | 2025 |
| Think 3 Consulting Ltd | Professional & scientific | 2019 |
| Thomas Potter Racing Ltd | Arts & recreation | 2025 |
| Thomp Estates Ltd | Real estate | 2021 |
| Thompson & Howe Limited | Health & social care | 2006 |
| Thompson (Wholesale Meat) Limited | Manufacturing | 1993 |
| Thompson Floor Screeding Limited | Construction | 2009 |
| Thompson HV Services Ltd | Construction | 2023 |
| Thornberries Management Company Limited | Households | 2017 |
| Thorngate Place Management Company Limited | Real estate | 2007 |
| Thornton Architectural Limited | Professional & scientific | 2013 |
| Throne Music Ltd | Information & communication | 2018 |
| Throstlenest Ltd | Real estate | 2020 |
| TIG Apps Limited | Information & communication | 2013 |
| Tigerman Properties Ltd | Real estate | 2016 |
| Tilly's Pack Limited | Agriculture & fishing | 2025 |
| TIM Scott Limited | Wholesale & retail | 2010 |
| Tindale Chippy Ltd | Hospitality | 2021 |
| Tindale Deli Ltd | Hospitality | 2025 |
| Tindale Sports & Social Club Limited | Hospitality | 2025 |
| Tindale Tachograph Centre Ltd | Wholesale & retail | 2024 |
| TIP Top Crane OP Ltd | Construction | 2025 |
| TJE North East Limited | Construction | 2022 |