| Negale Limited | Construction | 1995 |
| Neil Swinney Plumbing Services Limited | Construction | 2017 |
| Neil Wilson Electrical Contractors Limited | Construction | 2013 |
| Neon Studio Ltd. | Professional & scientific | 2014 |
| New East Farm Steading Management Company Limited | Households | 2016 |
| Nick Blake Limited | Construction | 2014 |
| NLC Consulting Management Limited | Information & communication | 2014 |
| NO.2 Chapel Street Management Company Limited | Real estate | 2013 |
| Noel Johnston Limited | Wholesale & retail | 2009 |
| Norham Development Trust Limited | Other services | 2019 |
| North East Mobility Solutions Limited | Wholesale & retail | 2012 |
| North Northumberland Voluntary Forum | Administrative & support | 2017 |
| North Wind Renewable Energy Services Limited | Energy | 2018 |
| Northeastroperescue Ltd | Construction | 2026 |
| Northern LAB Limited | Information & communication | 2009 |
| Northern Soul Kitchen CIC | Hospitality | 2016 |
| Northfield Contracts Limited | Construction | 2007 |
| Northfield Developments Limited | Professional & scientific | 2008 |
| Northumberland Glass Ltd | Construction | 2015 |
| Northumberland Jackpots Ltd | Administrative & support | 2024 |
| Northumberland Lodges Limited | Real estate | 2012 |
| Northumbrian Christmas Co Limited | Wholesale & retail | 2025 |
| Nova Commodity Clearing Ltd | Administrative & support | 2016 |
| Number One Leisure Limited | Professional & scientific | 1986 |
| O'Rourke Group Ltd | Financial services | 2018 |
| O'Rourke Property Investments Ltd | Real estate | 2018 |
| O-Tech Diving Ltd | Arts & recreation | 2026 |
| Old Smokery (Seahouses) Limited | Real estate | 2000 |
| Ollie Cowgill Ltd | Wholesale & retail | 2025 |
| OLS Consultants Limited | Information & communication | 2015 |
| Optimum Access Services Limited | Mining & quarrying | 2017 |
| Organ Ltd | Professional & scientific | 2021 |
| Owen Benzies Catering Ltd | Hospitality | 2026 |
| Ozkem Consultancy Ltd | Manufacturing | 2020 |
| P Red Events Limited | Hospitality | 2026 |
| Paint the Dog Historical Arts Ltd | Arts & recreation | 2026 |
| Paint the Dog Ltd | Arts & recreation | 2025 |
| Parsons and SON Building Contractors Limited | Construction | 2016 |
| Paton & Co Estate Agents LLP | | 2025 |
| Pearl Angel Food Ltd | Hospitality | 2024 |
| Pearpawquilting Ltd | Wholesale & retail | 2022 |
| Pebblebed Ltd | Information & communication | 2023 |
| Philipson Partners Limited | Agriculture & fishing | 2012 |
| Pier Maltings Management Company Limited | Households | 2015 |
| Pilgrims Coffee Ltd. | Hospitality | 2014 |
| Pink Pebble Digital Limited | Information & communication | 2022 |
| Pith Ltd | Manufacturing | 2020 |
| PJS Management Consultants Limited | Professional & scientific | 2012 |
| Planchest Consulting Ltd | Agriculture & fishing | 2026 |
| Polish Shop Pokusa Ltd | Wholesale & retail | 2012 |
| Port Brae Associates Ltd | Financial services | 2023 |
| Port Brae Holdings Limited | Financial services | 2011 |
| Pot-A-Doodle DO Limited | Arts & recreation | 2003 |
| Practice Insights Consultancy Ltd | Public administration | 2026 |
| Prana Leisure Group Ltd | Construction | 2023 |
| Preference Hire Solutions Limited | Administrative & support | 2017 |
| Premier Highfields Ltd | Wholesale & retail | 2022 |
| Premier Meats Limited | Wholesale & retail | 1997 |
| Prentice Agriculture Ltd | Agriculture & fishing | 2015 |
| Present Tents Ltd | Administrative & support | 2026 |
| Pridepath Computing Limited | Agriculture & fishing | 1995 |
| Pro-Found Building Consultants Ltd | Professional & scientific | 2018 |
| Pro-Found Building Group Ltd | Professional & scientific | 2018 |
| Pro-Found Development Limited | Construction | 2012 |
| Profile Management and Accounting Ltd | Administrative & support | 2017 |
| Punk Thinking Ltd | Professional & scientific | 2011 |
| Pyllon Ltd | Arts & recreation | 2016 |
| Quay Walls Limited | Professional & scientific | 2021 |
| Quick Start Guides Ltd | Information & communication | 2013 |
| R.H. Sprot & SON Limited | Agriculture & fishing | 2014 |
| R.Robinson(Snipe House)Limited | Agriculture & fishing | 1958 |
| R.Tile Limited | Agriculture & fishing | 1961 |
| RAE Usability Limited | Information & communication | 2011 |
| Raille Limited | Wholesale & retail | 2008 |
| Ramcap Ltd | Real estate | 2022 |
| Rare Reels by MR Hardy Limited | Wholesale & retail | 2023 |
| Raven Fell Limited | Information & communication | 2019 |
| RDI Plastering & Roofing Ltd | Construction | 2023 |
| RE Property Rentals Ltd | Real estate | 2026 |
| Red Box Consultants Ltd | Information & communication | 2019 |
| Reefhut Ltd | Wholesale & retail | 2026 |
| Reelmarker Limited | Information & communication | 2012 |
| Rhapsody Unisex Hair and Health Salon Limited | Other services | 2003 |
| Rise and Roam Travel Limited | Administrative & support | 2025 |
| RLM Carwash Limited | Administrative & support | 2012 |
| RM Community Healthcare Limited | Financial services | 2015 |
| RMCAF1 Ltd | Financial services | 2015 |
| Robertson Managing Consultants Ltd | Professional & scientific | 2015 |
| Robson Urwin & Co. Limited | Agriculture & fishing | 1973 |
| Rojuan Ltd | Other services | 2025 |
| Rose Solutions Ltd | Health & social care | 2025 |
| Ross Links Ltd | Extraterritorial | 2014 |
| S and V Industrial Painting Ltd | Construction | 2012 |
| SAC and Company Ltd | Administrative & support | 2014 |
| Salters Publishing Limited | Professional & scientific | 2015 |
| Salty Sea Dawg Limited | Hospitality | 2023 |
| Sanderson Mccreath & Edney Limited | Professional & scientific | 2012 |
| Sandgate Restaurant Ltd | Hospitality | 2026 |
| Sandstell Road Management Co. Limited | Real estate | 2003 |
| Seaview Steadings Management Limited | Real estate | 2004 |