| THE Logistics Alliance Ltd | Other services | 2026 |
| THE Lovely Photo Company Ltd | Information & communication | 2023 |
| THE LTA Group Ltd | Education | 2022 |
| THE Male Health Club Ltd | Health & social care | 2020 |
| THE Maskell Group Limited | Real estate | 2024 |
| THE Mayfield by Oceander Ltd | Hospitality | 2021 |
| THE Medi Spa @ Pure Bliss Ltd | Other services | 2022 |
| THE Muddled Brain Ltd | Health & social care | 2024 |
| THE National Tutor Register Ltd | Education | 2025 |
| THE New Cavalier Limited | Hospitality | 2013 |
| THE New IVY Leaf Club Ltd | Hospitality | 2011 |
| THE New Mountain Daisy Ltd | Manufacturing | 2025 |
| THE North East Automotive Alliance Limited | Other services | 2014 |
| THE Northern TEE Company Ltd | Wholesale & retail | 2024 |
| THE Office Rocks Ltd | Extraterritorial | 2018 |
| THE Original Fausto Coffee Ltd | Wholesale & retail | 2017 |
| THE Original Travel House Limited | Administrative & support | 2001 |
| THE Paddock NE Ltd | Hospitality | 2025 |
| THE Pamper Van (NE) Ltd | Arts & recreation | 2025 |
| THE Pillars of Parenting Limited | Health & social care | 2007 |
| THE Pink Cloth Company Ltd | Administrative & support | 2025 |
| THE Positive Empowerment Group Ltd | Education | 2023 |
| THE Rebellion Marketing Company (2) Limited | Professional & scientific | 2026 |
| THE Red Rock (N.E.) Ltd | Hospitality | 2014 |
| THE Retro Room N/E Ltd | Wholesale & retail | 2022 |
| THE Rise Healthcare Ltd | Health & social care | 2020 |
| THE Rise Project (Sunderland) Community Interest Company | Health & social care | 2022 |
| THE Roller Shutter Door Company Limited | Manufacturing | 2021 |
| THE Rolling and the Stoned Ltd | Manufacturing | 2023 |
| THE Ruby Cradle Ltd | Education | 2026 |
| THE Safc Heaven Branch CIC | Health & social care | 2025 |
| THE Safe Water Trust Limited | Manufacturing | 2009 |
| THE Sandwich Tree 2018 Ltd | Hospitality | 2018 |
| THE Scotch Export Company Ltd | Wholesale & retail | 2025 |
| THE Seafood Cartel NE Ltd | Hospitality | 2025 |
| THE Ship Isis Limited | Hospitality | 2019 |
| THE Silver Blueprint Limited | Information & communication | 2024 |
| THE Silver FOX Interiors Ltd | Wholesale & retail | 2021 |
| THE Sizzler Bar & Grill Ltd | Hospitality | 2019 |
| THE Sofia Sunderland Ltd | Hospitality | 2024 |
| THE Solution Hub Ltd | Information & communication | 2012 |
| THE Stumble Inn (Sunderland) Limited | Hospitality | 2022 |
| THE Sunbed Shop Sunderland Ltd | Other services | 2025 |
| THE Sunderland and North Durham Royal Society for the Blind | Health & social care | 1989 |
| THE Sunderland Black and Minority Ethnic Network Limited | Other services | 2009 |
| THE Sunderland Climbing Centre Ltd | Arts & recreation | 2012 |
| THE Sunderland Foot Clinic Ltd | Health & social care | 2016 |
| THE Talking Penguin Limited | Hospitality | 2025 |
| THE Tea Trailer Limited | Hospitality | 2022 |
| THE Tipi People Limited | Administrative & support | 2017 |
| THE Toxin Audit Co Ltd | Professional & scientific | 2025 |
| THE Toy Loan CIC | Arts & recreation | 2025 |
| THE Train Line (NE) Ltd | Hospitality | 2020 |
| THE Utilities Company Mjnt Ltd | Other services | 2020 |
| THE Village Care Home (South Hylton) Limited | Health & social care | 1998 |
| THE Voice Centre North East Ltd | Arts & recreation | 2022 |
| THE Watch Clinic Sunderland Ltd | Other services | 2019 |
| THE Weardale SKI Club Limited | Arts & recreation | 2006 |
| THE Wedding Women Limited | Wholesale & retail | 2025 |
| THE Westlands Sunderland Management Company Limited | Households | 2004 |
| THE Whitburn Rookery Limited | Real estate | 2018 |
| THE Whole House Approach Ltd | Construction | 2025 |
| THE Whole MD Ltd | Education | 2021 |
| THE Winning Tipsters Limited | Arts & recreation | 2014 |
| THE Woodman Inn (Burneston) Ltd | Hospitality | 2021 |
| The-Collective-Group Limited | Administrative & support | 2024 |
| THE4ES Ltd | Transport & logistics | 2023 |
| Theatre Leisure Limited | Hospitality | 2013 |
| Theatre Space North East CIC | Arts & recreation | 2016 |
| Thebrunchclub Ltd | Wholesale & retail | 2024 |
| Theesan Limited | Wholesale & retail | 2024 |
| Theesu Retail Limited | Wholesale & retail | 2022 |
| Thendral International Ltd | Wholesale & retail | 2020 |
| Thermalok Ltd | Manufacturing | 2025 |
| Thermon (U.K.) Limited | Manufacturing | 1979 |
| Thesoleguyy Ltd | Wholesale & retail | 2024 |
| Thho Ltd | Wholesale & retail | 2026 |
| Think D Ltd | Administrative & support | 2019 |
| Think Sound and Light Limited | Information & communication | 2019 |
| Thirnswood Limited | Wholesale & retail | 2014 |
| Thirteen Twenty Limited | Wholesale & retail | 2018 |
| This IS the Kingdom Limited | Other services | 2023 |
| THM Commercial Limited | Construction | 2019 |
| THM Property Portfolio Limited | Real estate | 2023 |
| Thoburn Fresh Produce Limited | Wholesale & retail | 2015 |
| Tholly Consultants Ltd | Administrative & support | 2016 |
| Thomas P & Co Ltd | Professional & scientific | 2019 |
| Thomas Woods Property Ltd | Real estate | 2026 |
| Thompson Accountancy Services ( Sunderland) Limited | Professional & scientific | 2011 |
| Thompson Park Cafe Limited | Hospitality | 2016 |
| Thompson Waste Limited | Water & waste | 2013 |
| Thomson Locum Services Ltd | Professional & scientific | 2014 |
| Thorncliffe Care Limited | Health & social care | 2007 |
| Thorncliffe Home Care Limited | Health & social care | 2010 |
| Thorndale Catering Ltd | Hospitality | 2025 |
| Thorndale Tandoori Ltd | Hospitality | 2016 |
| Thorne Road Estates Ltd | Real estate | 2024 |
| Thornfield Development Ltd | Real estate | 2025 |
| Thornton Consultancy Limited | Professional & scientific | 2023 |
| Thought Hub Ltd | Administrative & support | 2026 |