| Swinney Management Services NE Ltd | Professional & scientific | 2024 |
| Symon Holdings Ltd | Financial services | 2024 |
| T Dawson Ltd | Construction | 2012 |
| T J Joinery and Carpentry Ltd | Construction | 2026 |
| T N Hall and Sons Ltd | Agriculture & fishing | 2017 |
| T W Eason Limited | Construction | 2014 |
| T&G Allan Limited | Wholesale & retail | 2019 |
| T. Thompson & Sons Limited | Wholesale & retail | 2003 |
| T.O.W Electrical Contractors Ltd | Construction | 2025 |
| T.W. Jones Downstream Consulting Ltd | Professional & scientific | 2010 |
| T9 Medical Ltd | Health & social care | 2025 |
| Tactical Shooting Solutions Ltd | Wholesale & retail | 2018 |
| Talentheads Ltd | Administrative & support | 2019 |
| Tallulah's Bar & Lounge Ltd | Hospitality | 2025 |
| Tamarind Consulting International Limited | Professional & scientific | 2019 |
| Tanglewood Equestrian Ltd | Agriculture & fishing | 2019 |
| Tantallon Estates Limited | Real estate | 2015 |
| Tantastic 24HR Ltd | Other services | 2026 |
| Tanwood Ltd | Professional & scientific | 2022 |
| Taste of Northumberland Ltd | Real estate | 2018 |
| Taylormade Supplements Ltd | Wholesale & retail | 2026 |
| Taylors Agriculture (Northumberland) Limited | Wholesale & retail | 2014 |
| TB Rope Access Ltd | Construction | 2025 |
| TC Surgical Limited | Education | 2023 |
| TDL Autos Limited | Wholesale & retail | 2014 |
| Team G Healthcare Ltd | Health & social care | 2019 |
| Team-Wise (UK) Limited | Wholesale & retail | 2004 |
| Technical Hyperbarics Ltd | Professional & scientific | 2018 |
| TED Pizza Ltd | Hospitality | 2024 |
| Telford CRS Holdings Limited | Professional & scientific | 2020 |
| Telleo Partners Ltd | Professional & scientific | 2023 |
| Terry Fogerty Pest Management Ltd | Agriculture & fishing | 2024 |
| TFD Hospitality Limited | Hospitality | 2024 |
| TG Law Limited | Professional & scientific | 2012 |
| THE Abbey Newsagent Limited | Wholesale & retail | 2025 |
| THE ALE Gate Ltd | Hospitality | 2018 |
| THE Alloy Wheel Specialist Ltd | Wholesale & retail | 2013 |
| THE Amble Butcher Limited | Wholesale & retail | 2009 |
| THE Angels Creator Network Ltd | Professional & scientific | 2025 |
| THE Bells Glamping Ltd | Hospitality | 2024 |
| THE Birks Stables Ltd | Agriculture & fishing | 2011 |
| THE Book Publishers Ltd | Professional & scientific | 2016 |
| THE Box Room North East Ltd | Wholesale & retail | 2025 |
| THE Burgoyne Hotel Limited | Hospitality | 2017 |
| THE Canny Bakery Ltd | Manufacturing | 2024 |
| THE Cleaning Company NE Limited | Administrative & support | 2020 |
| THE Clifton Estate Holdings Ltd | Real estate | 2021 |
| THE Clifton Estate Property Investment Ventures Limited | Construction | 2020 |
| THE Clifton Estate Specialised Supported Housing Ltd | Construction | 2025 |
| THE Coloured Horse and Pony Society (UK) | Other services | 1998 |
| THE Cosy Club Ltd | Wholesale & retail | 2025 |
| THE Courtyard Pegswood Ltd | Hospitality | 2020 |
| THE Cracket Ltd | Wholesale & retail | 2021 |
| THE Croft 1961 Limited | Extraterritorial | 2014 |
| THE Cycle Partnership Ltd | Education | 2022 |
| THE Dent Whisperer Ltd | Wholesale & retail | 2021 |
| THE Dickinson Group Limited | Agriculture & fishing | 2024 |
| THE Dragons Mess Ltd | Hospitality | 2024 |
| THE Dyke Neuk Inn Ltd | Hospitality | 2018 |
| THE East Wing Studios Ltd | Information & communication | 2015 |
| THE Easy Conveyancing Hub Limited | Information & communication | 2021 |
| THE Espley Estate Sewage Works Company Limited | Water & waste | 1998 |
| THE Felton Old Mill Company Limited | Households | 1991 |
| THE Flying Logman Ltd | Agriculture & fishing | 2020 |
| THE Fresh Start Cleaning and Property Management Ltd | Administrative & support | 2025 |
| THE Fungi Collective Ltd | Hospitality | 2021 |
| THE Ginger Veteran Engineering Ltd | Manufacturing | 2025 |
| THE Golden Passport Ltd | Administrative & support | 2026 |
| THE Golf Factory.Com Limited | Administrative & support | 2018 |
| THE Green at Netherton Park Ltd | Real estate | 2025 |
| THE Greenhouse (Warkworth) Limited | Wholesale & retail | 2003 |
| THE Hartlaw Management Company Limited | Households | 2003 |
| THE Helm Amble Limited | Hospitality | 2025 |
| THE Impulse Group Limited | Professional & scientific | 2015 |
| THE Interior CAD GUY Ltd | Professional & scientific | 2023 |
| THE Jewellers Guild Ltd | Wholesale & retail | 2000 |
| THE Laser Clinic Morpeth Ltd | Health & social care | 2018 |
| THE Leomoor Company Ltd | Real estate | 2025 |
| THE Lisa Project CIC | Education | 2025 |
| THE Morpeth Golf Club Limited | Arts & recreation | 1992 |
| THE Morpeth Golf Club Trading Limited | Arts & recreation | 2025 |
| THE Morpeth Practice Ltd | Professional & scientific | 2005 |
| THE Mortal Portal Drinks Delivery Ltd | Wholesale & retail | 2024 |
| THE Multiple Sclerosis Research and Relief Fund | Health & social care | 1964 |
| THE North East Goalkeeper Company Limited | Education | 2021 |
| THE Nursery at Whitehouse Farm Limited | Education | 2017 |
| THE Office (Morpeth) Limited | Hospitality | 2014 |
| THE Old Mine Small Holding Ltd | Agriculture & fishing | 2023 |
| THE Old Motor House Limited | Wholesale & retail | 2021 |
| THE Paddock (North East) Limited | Hospitality | 2019 |
| THE Physiotherapy & Sports Clinic Morpeth Ltd | Health & social care | 2020 |
| THE Picture House Company (NE) Limited | Information & communication | 2011 |
| THE Plough Ellington Ltd | Other services | 2024 |
| THE Plough Powburn Ltd | Hospitality | 2023 |
| THE Portal Co (NE) Limited | Other services | 2009 |
| THE Private Ultrasound Clinic Ltd | Health & social care | 2014 |
| THE Proper PUB Group Ltd | Real estate | 2026 |
| THE Push Creative Group Limited | Arts & recreation | 2006 |
| THE Running FOX Cafe Ltd | Hospitality | 2014 |
| THE Service Station MOT Centre Ltd | Wholesale & retail | 2023 |