| Norris Talent Partners Limited | Extraterritorial | 2026 |
| Nortech Radio Communications Limited | Information & communication | 2018 |
| North Crawley Heat Network Limited | Construction | 2025 |
| North Cumbria Primary Care Limited | Health & social care | 2018 |
| North END Management (Carlisle) Limited | Households | 2020 |
| North Lakes Design CIC | Manufacturing | 2026 |
| North Lakes Energy Limited | Professional & scientific | 2017 |
| North Lakes Lodges Limited | Extraterritorial | 2016 |
| North Lakes Retreats Limited | Extraterritorial | 2016 |
| North Lakes Taxi Hire Limited | Transport & logistics | 2015 |
| North West Air Limited | Administrative & support | 2022 |
| North West Drilling Services Ltd | Construction | 2002 |
| North West Floating Production Services Ltd | Professional & scientific | 2014 |
| North West Property 2026 Ltd | Real estate | 2026 |
| North West Rail Services Ltd | Construction | 2016 |
| North West Recycling Limited | Water & waste | 2007 |
| North West Regeneration Ltd | Manufacturing | 2023 |
| North West Training Services Limited | Education | 2008 |
| Northback Limited | Wholesale & retail | 2012 |
| Northern Advantage Limited | Real estate | 2018 |
| Northern Blinds Limited | Wholesale & retail | 2014 |
| Northern Bouldering Ltd. | Arts & recreation | 2011 |
| Northern Bulls Limited | Administrative & support | 2014 |
| Northern Construction & Security Limited | Construction | 2001 |
| Northern Fells Business Advice Limited | Professional & scientific | 2024 |
| Northern Holdings (SD) Limited | Real estate | 2025 |
| Northern Joinery Contracting Ltd | Construction | 2022 |
| Northern Mudlarks Ltd | Information & communication | 2022 |
| Northern Nics Back Kitchen Ltd | Information & communication | 2024 |
| Northern Resilience Ltd | Water & waste | 2025 |
| Northern Roofing Services Limited | Construction | 2011 |
| Northern Security Limited | Administrative & support | 1999 |
| Northern Security Systems Limited | Administrative & support | 2002 |
| Northern Spirits Distilling Ltd | Manufacturing | 2022 |
| Northern Sun Ltd | Health & social care | 2021 |
| Northern Tarn Limited | Financial services | 2024 |
| Northern Threadz Limited | Wholesale & retail | 2024 |
| Northern Waste Management Ltd | Water & waste | 2014 |
| Northsett Cabins Limited | Manufacturing | 2026 |
| Northumbria Stone Limited | Extraterritorial | 2014 |
| Northwood (Cumbria) Limited | Real estate | 2006 |
| Norton Lees Hall and Lodge Limited | Health & social care | 2018 |
| Norton PR and Marketing Limited | Other services | 1999 |
| Norwest Engineering Holdings Limited | Manufacturing | 2024 |
| Norwest Engineering Limited | Manufacturing | 2000 |
| Norwest Fresh Ltd | Wholesale & retail | 2022 |
| Nostell Developments Limited | Construction | 2016 |
| Nova Power Limited | Professional & scientific | 2012 |
| NOW PAY Limited | Administrative & support | 2023 |
| Nphbs Limited | Professional & scientific | 2017 |
| NPK Properties Limited | Real estate | 2014 |
| Npra (Penrith) Residents Association Ltd. | Households | 1997 |
| NRG Electrical Systems Ltd | Construction | 2022 |
| Nsemba Limited | Health & social care | 2022 |
| Nubie Ltd | Wholesale & retail | 2007 |
| Nupace Limited | Professional & scientific | 2024 |
| Nutrigrow Limited | Agriculture & fishing | 2020 |
| Nutripharm Limited | Manufacturing | 2010 |
| NVD Consult Limited | Professional & scientific | 2018 |
| NW Forestry Ltd | Agriculture & fishing | 2023 |
| NW Primecare Recruitment Limited | Health & social care | 2022 |
| NW Total Engineered Solutions Ltd. | Wholesale & retail | 1994 |
| NXT Recruitment Ltd | Administrative & support | 2014 |
| Nyaseme Limited | Wholesale & retail | 2025 |
| NZ Marine Eight Limited | Energy | 2026 |
| NZ Marine Five Limited | Energy | 2025 |
| NZ Marine Four Limited | Energy | 2025 |
| NZ Marine Seven Limited | Energy | 2025 |
| NZ Marine SIX Limited | Energy | 2025 |
| NZ Marine Three Limited | Energy | 2025 |
| NZ Marine Two Limited | Energy | 2025 |
| O & C (Cumbria) Ltd | Extraterritorial | 2018 |
| O'Reilly Space & Air Traffic Management Ltd | Transport & logistics | 2024 |
| Oak END Housing Ltd | Real estate | 2024 |
| Oak Tree Animals' Charity | Agriculture & fishing | 2016 |
| Oakay Direct Ltd. | Wholesale & retail | 2010 |
| Oakfield Park Kirkby Lonsdale Management Company Limited | Households | 2019 |
| Oakland Park (Morpeth) Management Company Limited | Real estate | 2018 |
| Oakleigh Fields (Carlisle) Management Company Limited | Real estate | 2022 |
| Oaktree Risk Services Limited | Professional & scientific | 2009 |
| OB Commercials Ltd | Wholesale & retail | 2025 |
| OBT Vehicle Sales Ltd | Wholesale & retail | 2021 |
| OC Cumbria Limited | Hospitality | 2025 |
| OCM Plumbing Ltd | Construction | 2024 |
| OEE Container Technology Limited | Manufacturing | 2018 |
| OGB Kwik Care Response Ltd | Health & social care | 2022 |
| OH Acquisitions Limited | Health & social care | 2010 |
| OJS Commercials Limited | Wholesale & retail | 2011 |
| Okoro Siteworks Ltd | Construction | 2025 |
| Old Eden Limited | Construction | 2014 |
| Old Kent Road Project Ltd | Construction | 2021 |
| Old Number 7 Limited | Professional & scientific | 2015 |
| Old Shambles (Kendal) Management Company Limited | Real estate | 2022 |
| Old Town Farming | Administrative & support | 2009 |
| Oldford Farms Limited | Agriculture & fishing | 2014 |
| Olena Naumowicz Ltd | Manufacturing | 2017 |
| Oliphant Holdings Limited | Extraterritorial | 2014 |
| Olive Tree Beauty Limited | Health & social care | 2017 |
| Oliver Forestry Limited | Agriculture & fishing | 2024 |
| Olly Foster Fitness Limited | Other services | 2012 |