| Northumberland Line Community Rail Partnership C.I.C. | Education | 2024 |
| Northumbria Cleaning Services Limited | Administrative & support | 2020 |
| Northumbria Stone Products Limited | Manufacturing | 2005 |
| Nova IP Ltd | Information & communication | 2024 |
| O.A.T.I Transport Ltd | Transport & logistics | 2025 |
| Old School House (Haltwhistle) Ltd | Hospitality | 2015 |
| Omnisynth Bioindustries Ltd | Professional & scientific | 2026 |
| P.D.Kennedy Electricals Limited | Construction | 2000 |
| Para-Solr Limited | Manufacturing | 2024 |
| Phillip Thompson GAS Installer Limited | Construction | 2010 |
| Plaster Ceiling Roses Limited | Wholesale & retail | 2024 |
| Postma Electrical Limited | Construction | 2010 |
| Potts Plant Hire Ltd | Administrative & support | 2025 |
| PPH Hire and Supplies Limited | Administrative & support | 2017 |
| Praise Gray Ltd | Health & social care | 2020 |
| Pro-Core Scaffolding UK Ltd | Construction | 2025 |
| Procore Recruit Ltd | Administrative & support | 2019 |
| Prozomix Limited | Manufacturing | 2008 |
| R S Lees Limited | Wholesale & retail | 2011 |
| Resilience Planning Services Ltd | Professional & scientific | 2014 |
| RGN Walling Ltd | Construction | 2024 |
| Rich Alderson Limited | Information & communication | 2013 |
| Rosewing Estates & Management Ltd | Real estate | 2025 |
| Rosie Sanders Limited | Arts & recreation | 2014 |
| Ruff Roamers Ltd | Information & communication | 2021 |
| Sea Dog Art Limited | Arts & recreation | 2012 |
| Shawfield Park Limited | Financial services | 2018 |
| Site Services (NE) Limited | Construction | 2015 |
| Sloan Electrical & Mechanical Services Ltd | Professional & scientific | 2018 |
| Sloan Property Letting a Ltd | Real estate | 2025 |
| SMA Generator Services Ltd | Professional & scientific | 2025 |
| Snowden Companies Ltd | Wholesale & retail | 2022 |
| Solarsigns UK Limited | Administrative & support | 2005 |
| Sovalli Limited | Wholesale & retail | 2005 |
| Stanegate Restorations and Replicas Limited | Construction | 2006 |
| Static Carnival Holdings Limited | Financial services | 2026 |
| Static Carnival Technologies Limited | Information & communication | 2026 |
| Storescore Ltd | Information & communication | 2025 |
| Storey & Dodd Accountants Limited | Professional & scientific | 2020 |
| Storey & Dodd Limited | Professional & scientific | 2002 |
| Stuart Halbert Foundation | Administrative & support | 2010 |
| Studio Ewing Limited | Administrative & support | 2014 |
| SWS Marine Ltd | Manufacturing | 2026 |
| T&O Consulting Ltd | Professional & scientific | 2023 |
| Tarmark Limited | Construction | 2016 |
| Tarncrag Gundogs Ltd | Agriculture & fishing | 2026 |
| Tectonic Traders Ltd | Wholesale & retail | 2020 |
| TGT Holidays Limited | Administrative & support | 2002 |
| THE Black Bull Haltwhistle Ltd | Hospitality | 2019 |
| THE Hair Designers Haltwhistle Limited | Other services | 2025 |
| THE Strategic Insight Consultancy Limited | Professional & scientific | 2011 |
| THE Tyne Valley Community Rail Partnership | Transport & logistics | 2004 |
| THE Yellow Bird Cafe Ltd | Wholesale & retail | 2022 |
| TIM Doody & Co. Limited | Construction | 1978 |
| Training Plus Academy Ltd | Education | 2023 |
| V Nascimento Ceramics Limited | Arts & recreation | 2012 |
| Wall Developments Ltd | Construction | 2025 |
| Williams Delivery Ltd | Transport & logistics | 2025 |
| Wyndenwell Limited | Wholesale & retail | 2024 |