| THE Home of Wellness Ltd | Health & social care | 2024 |
| THE Honeybee Group Ltd | Professional & scientific | 2022 |
| THE HR Fixers Limited | Professional & scientific | 2022 |
| THE Human Office Limited | Wholesale & retail | 1999 |
| THE Humpty Dumpty EGG Company Limited | Real estate | 2018 |
| THE HUT Gym Ltd | Arts & recreation | 2019 |
| THE Indian Snack Lunch Box - Cafe & Catering Ltd | Hospitality | 2025 |
| THE Infinite Game Ltd | Professional & scientific | 2019 |
| THE Infinity Shop Ltd | Wholesale & retail | 2025 |
| THE Innvest Leisure Group Limited | Hospitality | 2019 |
| THE Institute of Company Accountants | Other services | 1974 |
| THE Investment Companion Limited | Administrative & support | 2009 |
| THE Islamic Centre Ltd | Education | 2024 |
| THE Islamic Diversity Centre | Other services | 2019 |
| THE IVY Boutique Ltd | Wholesale & retail | 2023 |
| THE Jays Band LLP | | 2025 |
| THE Jesmond Community CIC | Education | 2023 |
| THE JGW Patterson Foundation | Real estate | 2002 |
| THE Jigsaw Foundation | Other services | 2012 |
| THE Jonathan J Robson Company Limited | Construction | 2017 |
| THE Journal SK Ltd | Wholesale & retail | 2024 |
| THE Junction 42 Foundation | Health & social care | 2012 |
| THE KC Foundation | Health & social care | 2015 |
| THE Kelly Hendry Feis Limited | Arts & recreation | 2016 |
| THE KEN Bell Seafood Company Limited | Manufacturing | 1973 |
| THE Key-Uk Limited | Other services | 1997 |
| THE Killingworth Arms PUB & Kitchen Ltd | Hospitality | 2023 |
| THE Kilns (Beadnell) Management Company Limited | Real estate | 2021 |
| THE Kingdom Creative Limited | Professional & scientific | 2011 |
| THE Kingston Park Forum Limited | Public administration | 2018 |
| THE Kipley Group Limited | Real estate | 2021 |
| THE Kitchen Makeover Company (North East) Ltd | Construction | 2023 |
| THE Knightsbridge Management Company Limited | Real estate | 2003 |
| THE Ladle Management Limited | Real estate | 2004 |
| THE Laidlaw Schools Trust | Education | 2006 |
| THE Laluna Group Ltd | Hospitality | 2022 |
| THE Lamp House Group Limited | Other services | 2021 |
| THE Lanchester Village Show Limited | Arts & recreation | 2024 |
| THE Larkes Management Company Limited | Households | 2007 |
| THE Lash Gang (NE) Ltd | Wholesale & retail | 2024 |
| THE Lash Loft (Great Park) Ltd | Other services | 2019 |
| THE Lash Lounge (NE) Limited | Other services | 2022 |
| THE Laundry Works by Pro-Clean Ltd | Administrative & support | 2018 |
| THE Laundry Worx Limited | Other services | 2025 |
| THE Laurels (West Monkseaton) Management Company Limited | Households | 2004 |
| THE Lazy SIX Ltd | Hospitality | 2022 |
| THE Lead Ingredient Ltd | Professional & scientific | 2013 |
| THE Learner's Hub Limited | Education | 2025 |
| THE Leas at Medburn Management Company Limited | Households | 2018 |
| THE Lingolab Limited | Extraterritorial | 2013 |
| THE Liquor & Restaurant Group Limited | Hospitality | 2017 |
| THE Literary & Philosophical Trading Company Ltd | Hospitality | 2012 |
| THE Little HUT Company Ltd | Manufacturing | 2011 |
| THE Little HUT PRE School Community Interest Company | Education | 2016 |
| THE Little Lotus Nursery | Education | 2017 |
| THE Little Phonery Ltd | Other services | 2017 |
| THE Little Sleep Group Ltd | Other services | 2023 |
| THE Liversidge Group Limited | Health & social care | 2024 |
| THE Lock UP NCL Ltd | Hospitality | 2024 |
| THE Lodge Properties (NE) Limited | Real estate | 2025 |
| THE London Food Factory Ltd | Manufacturing | 2024 |
| THE Lubber Fiend C.I.C. | Arts & recreation | 2021 |
| THE Luxe Within Ltd | Wholesale & retail | 2018 |
| THE Lyttle Property Company Ltd | Real estate | 2025 |
| THE MAD House NCL Ltd | Hospitality | 2022 |
| THE Maguire 4 Limited | Health & social care | 2022 |
| THE Make IT and Break IT Community Interest Company | Wholesale & retail | 2025 |
| THE Mallard Publishing Group Ltd | Information & communication | 2021 |
| THE Management Centre (UK) Limited | Professional & scientific | 2003 |
| THE Mandrake Lounge Ltd | Hospitality | 2019 |
| THE Manydown Company Limited | Agriculture & fishing | 1962 |
| THE Marley Store Community Interest Company | Wholesale & retail | 2023 |
| THE Matfen Bull Ltd | Hospitality | 2025 |
| THE Mcfarlane Partnership 2017 Ltd | Professional & scientific | 2017 |
| THE Mckenzie Corporation Limited | Administrative & support | 1996 |
| THE MEA Trust | Real estate | 1999 |
| THE Meadows (Dishforth) Management Company Limited | Households | 2020 |
| THE Meadows (Framwellgate) Limited | Real estate | 2008 |
| THE Meadows (Washington) Management Company Limited | Real estate | 2008 |
| THE Medical Chambers Limited | Health & social care | 2020 |
| THE Middles (Stanley) Management Company Limited | Households | 2013 |
| THE Middleton Foundation | Other services | 2016 |
| THE Mind Workshops Ltd | Education | 2025 |
| THE Minel Group Ltd. | Construction | 2000 |
| THE MN Film Partnership NO.2, LLP | | 2001 |
| THE Modular Consultancy NE Ltd | Professional & scientific | 2024 |
| THE Moustache Maker Ltd | Manufacturing | 2018 |
| THE Muddler (Newcastle) Limited | Hospitality | 2017 |
| THE Muddler Group 1 Limited | Hospitality | 2022 |
| THE Muddler Group Holdings Limited | Financial services | 2022 |
| THE Muddler Group Limited | Financial services | 2022 |
| THE Nails Place Limited | Other services | 2020 |
| THE Naked Foodie Ltd | Hospitality | 2019 |
| THE Natural Brow Company Ltd | Other services | 2021 |
| THE NE Seed Capital Fund Limited Partnership | | 2001 |
| THE NET Seafood Ltd | Hospitality | 2025 |
| THE NET Swarm Ltd | Information & communication | 2007 |
| THE Neurosciences Foundation Limited | Other services | 1997 |
| THE Neutral Corner Ltd | Professional & scientific | 2012 |
| THE New Benwell Social Club Ltd | Hospitality | 2026 |