| Tgmgroup Limited | Transport & logistics | 2000 |
| TH Goodey and Sons Ltd | Construction | 2024 |
| Thai TAM (NE) Ltd | Hospitality | 2025 |
| Thai Thai Kitchen Limited | Hospitality | 2023 |
| Thas Property Ltd | Real estate | 2025 |
| Thas Retail Ltd | Wholesale & retail | 2025 |
| That Guru Ltd | Wholesale & retail | 2022 |
| Thatos Limited | Health & social care | 2022 |
| Thcbd UK Limited | Wholesale & retail | 2022 |
| THE 16 South Cliff Owners Management Company Limited | Households | 2024 |
| THE Ades Global Property Limited | Real estate | 2025 |
| THE Alpha Ursae Minoriss (Yorkshire) Ltd | Wholesale & retail | 2026 |
| THE Alpha Ursae Minoriss Ltd | Wholesale & retail | 2025 |
| THE Alvarez Chamber Orchestra | Arts & recreation | 2007 |
| THE Apostolic Church Sunderland Limited | Other services | 2026 |
| THE Apperta Foundation C.I.C. | Information & communication | 2015 |
| THE Applied Learning Network CIC | Professional & scientific | 2026 |
| THE Architects' Choice Limited | Wholesale & retail | 2018 |
| THE Ascent Academies' Trust | Education | 2012 |
| THE Ashbrooke Group Ltd | Professional & scientific | 2020 |
| THE Association of North East Councils Limited | Administrative & support | 2004 |
| THE Astrologer Limited | Construction | 1994 |
| THE Avala Brand Ltd | Wholesale & retail | 2025 |
| THE Bam's Lets Ltd | Real estate | 2024 |
| THE Bathroom Cladding Centre Ltd | Wholesale & retail | 2012 |
| THE Beauty Loft Sunderland LLP | | 2024 |
| THE Beauty Lounge (Sunderland) Limited | Other services | 2022 |
| THE Bifold Outlet Ltd | Manufacturing | 2019 |
| THE Big Roofing Company Ltd | Construction | 2024 |
| THE Biogo Nation Limited | Wholesale & retail | 2018 |
| THE Birth BAG Co. Ltd | Wholesale & retail | 2025 |
| THE Black Cat Group Limited | Financial services | 2016 |
| THE Black Door Hairdressing Ltd | Other services | 2012 |
| THE Box Youth and Community Project Ltd. | Other services | 2002 |
| THE Bridge Hotel Vaults Ltd | Hospitality | 2024 |
| THE Broadway PUB Co Ltd | Wholesale & retail | 2019 |
| THE Building Design Solutions Group Ltd | Construction | 2022 |
| THE Calming Babies Company Ltd | Wholesale & retail | 2020 |
| THE Cambridge PUB (Sunderland) Ltd | Hospitality | 2023 |
| THE Cardell Group Ltd | Professional & scientific | 2024 |
| THE Cedars Nursery Limited | Education | 1996 |
| THE Ceramic Cabin Ltd | Manufacturing | 2024 |
| THE Cheesecake MAN Ltd | Manufacturing | 2025 |
| THE Chiltern Railway Company Limited | Transport & logistics | 1995 |
| THE City of Sunderland Model Engineering Society Limited | Arts & recreation | 1980 |
| THE Cleaning Company North East Ltd | Administrative & support | 2012 |
| THE Cloisters Management Company (Sunderland) Limited | Households | 2001 |
| THE Close (Whitburn) Freehold Ltd | Real estate | 2016 |
| THE Coffee Hair Co Ltd | Administrative & support | 2022 |
| THE Confetti Lounge Ltd | Wholesale & retail | 2022 |
| THE Container Company Ltd | Wholesale & retail | 2002 |
| THE Container People Ltd | Administrative & support | 2023 |
| THE Content PT Ltd | Administrative & support | 2020 |
| THE Cosmetics UNI Ltd | Education | 2022 |
| THE Cosy Coat Studio Ltd | Other services | 2025 |
| THE Cosy CUP Redcar Ltd | Hospitality | 2026 |
| THE Coterie Global CIC | Education | 2026 |
| THE Crispy Bite (Murton) Limited | Hospitality | 2026 |
| THE Crysalis Ltd | Other services | 2025 |
| THE Deluge Group Ltd | Wholesale & retail | 2019 |
| THE Diamond Project Group Ltd | Professional & scientific | 2021 |
| THE Dinner Ladies New Limited | Hospitality | 2026 |
| THE Dinner Ladies Ryhope Ltd | Hospitality | 2024 |
| THE Drama LAB Limited | Arts & recreation | 2014 |
| THE Experience Effect Ltd | Professional & scientific | 2026 |
| THE Finney Pharma Ltd | Wholesale & retail | 2018 |
| THE Food Emporium Mobile Ltd | Hospitality | 2025 |
| THE Food Father Ltd | Hospitality | 2023 |
| THE Football Supporters' Association Limited | Other services | 2018 |
| THE Forage Community Project Community Interest Company | Hospitality | 2018 |
| THE Fort PUB and Leasure Group Ltd | Hospitality | 2025 |
| THE Friendship Place CIC | Hospitality | 2021 |
| THE Fuelled Coffee Company Ltd | Wholesale & retail | 2025 |
| THE Garden and Home Company International Ltd | Wholesale & retail | 2021 |
| THE Gardeners PUB Co Ltd | Hospitality | 2026 |
| THE GAS Works (North East) Ltd | Manufacturing | 2014 |
| THE Glenleigh Group Ltd | Real estate | 2026 |
| THE Glow JOB NE Ltd | Other services | 2025 |
| THE Glow Zone Ltd | Other services | 2023 |
| THE Golf Studio Limited | Other services | 2019 |
| THE Good Estate Agent Sunderland Ltd | Real estate | 2024 |
| THE Green Circuit Limited | Professional & scientific | 2026 |
| THE Green Energy Advice Bureau Ltd | Administrative & support | 2013 |
| THE Grey Area Theatre Company Limited | Arts & recreation | 2020 |
| THE Hair Extension Specialist Ltd | Other services | 2021 |
| THE Heritage Publishers Limited | Information & communication | 2021 |
| THE Holiday and Flight Centre Limited | Administrative & support | 2002 |
| THE House of Hair by Claire Ltd | Other services | 2015 |
| THE House of Hues Ltd | Professional & scientific | 2013 |
| THE Independent Travel Company Limited | Administrative & support | 1993 |
| THE Inn Place (Sunderland) Limited | Hospitality | 2017 |
| THE Interflex Group Europe Limited | Professional & scientific | 1999 |
| THE KB Mart Ltd | Wholesale & retail | 2025 |
| THE Lansdowne PUB Ltd | Hospitality | 2015 |
| THE Latch (Learning and Teaching Cooking Hub) CIC | Education | 2025 |
| THE Leadership Organization Limited | Professional & scientific | 2003 |
| THE Learned Care Ltd | Information & communication | 2025 |
| THE Legal House Limited | Information & communication | 2010 |
| THE Legal Team Limited | Professional & scientific | 2022 |
| THE Littl'Un PUB Ltd | Hospitality | 2026 |