| Mumme and ME Ltd | Other services | 2025 |
| MWG Management Services Ltd | Professional & scientific | 2020 |
| N & D Financials Limited | Financial services | 2023 |
| N & J Waite Limited | Transport & logistics | 2018 |
| N Barry Property Ltd | Real estate | 2024 |
| N Holden Engineering Limited | Professional & scientific | 2022 |
| N W B Consultants Limited | Administrative & support | 2002 |
| N. & M. Walkingshaw Limited | Extraterritorial | 1977 |
| Nadia Weekes Editorial Ltd | Information & communication | 2022 |
| Nanp Ltd | Other services | 2024 |
| National College for Nuclear and Clean Energy | Education | 2016 |
| NAW Financial Services Ltd | Professional & scientific | 2026 |
| NAW Property Group Ltd | Real estate | 2026 |
| NB Dentech Ltd | Wholesale & retail | 2003 |
| NC Travel (Cumbria) Limited | Transport & logistics | 2019 |
| Nead CIC | Administrative & support | 2024 |
| Nelliks Technical Solutions Limited | Administrative & support | 2020 |
| New Gate Estates Limited | Real estate | 2009 |
| New Peking Express 168 Ltd | Hospitality | 2026 |
| New Smarttyre Whitehaven Limited | Wholesale & retail | 2018 |
| NGP Developments Limited | Construction | 2022 |
| Nice 2 Hear Ltd | Education | 2025 |
| Nicola Claire Hair Studio Ltd | Other services | 2014 |
| Nics Voices of Hope Ltd | Other services | 2025 |
| Nigel KAY Estates Ltd | Construction | 2026 |
| Nigel KAY Homes Ltd | Real estate | 2002 |
| Nine Five Limited | Professional & scientific | 2025 |
| NO Ordinary Woman Limited | Administrative & support | 2018 |
| No-Bull Farmacy Limited | Manufacturing | 2025 |
| Noble Peaks Cottage Management Agency Ltd | Real estate | 2024 |
| Nomad Tree Services Limited | Agriculture & fishing | 2016 |
| Nora Aesthetic Ltd | Health & social care | 2024 |
| North Lakes Estates Limited | Construction | 2014 |
| North Safety Services Limited | Real estate | 2014 |
| North Stone Property Co (North) Ltd | Real estate | 2026 |
| North West Industrial Group Ltd | Construction | 2025 |
| North West Supply Hub Ltd | Wholesale & retail | 2025 |
| Northern Asset Sales Ltd | Wholesale & retail | 2024 |
| Northern Fallen Stock Ltd | Water & waste | 2008 |
| Northside Community Centre Limited | Professional & scientific | 2002 |
| Northumberland Aircraft Maintenance Limited | Transport & logistics | 2003 |
| NOS Inspections Limited | Construction | 2018 |
| NRW Property Management Limited | Households | 2021 |
| Nuclear Manufacturing & Site Services Limited | Manufacturing | 2012 |
| Nuclear Projects Consultants Limited | Administrative & support | 2006 |
| NWN Properties Ltd | Real estate | 2026 |
| NX Consulting Limited | Professional & scientific | 2011 |
| O'Leary Civils & Utilities Ltd | Construction | 2025 |
| Oakbank Farm (Loweswater) Property Limited | Real estate | 2020 |
| Oilys Cumbria Limited | Hospitality | 2025 |
| OJK Investments Ltd | Construction | 2023 |
| Olivia Mason Limited | Professional & scientific | 2026 |
| ON TAP Heating & Plumbing Services Cumbria Limited | Construction | 2017 |
| Osteo Health Hub Ltd | Health & social care | 2024 |
| OUR Fells Ltd | Information & communication | 2025 |
| OUR Happy Place ST Ives Ltd | Hospitality | 2023 |
| Owen Carmen Limited | Information & communication | 2024 |
| OX Fight Academy Ltd | Arts & recreation | 2026 |
| O’Neill Aesthetic Ltd | Other services | 2023 |
| P & C Residential Services Limited | Health & social care | 2002 |
| P & S Watson Limited | Agriculture & fishing | 2006 |
| P J Enterprises Cumbria Ltd | Construction | 2010 |
| P&R Refurbishments Ltd | Construction | 2026 |
| P.D.S. Plant & Electrical Limited | Administrative & support | 2022 |
| Pack N Stack Storage Solutions Ltd | Transport & logistics | 2025 |
| Paisleys Solicitors Limited | Extraterritorial | 2013 |
| Paladin Farm Services Ltd | Agriculture & fishing | 2012 |
| Pale Horizon Ltd | Wholesale & retail | 2024 |
| Pantala Ltd | Manufacturing | 2025 |
| Party Bars Cumbria Limited | Hospitality | 2016 |
| Paton Bros Scaffolding Holdings Limited | Construction | 2024 |
| Paton Bros Scaffolding Limited | Construction | 2002 |
| Paul's Taxis (Cumbria) Limited | Transport & logistics | 2011 |
| Pawprints Pet Boarding Limited | Agriculture & fishing | 2023 |
| Pctactics App Ltd | Education | 2025 |
| Peachy Locks Ltd | Wholesale & retail | 2025 |
| Peel's Family Butchers Ltd | Wholesale & retail | 2024 |
| PEG and SAM Properties Ltd | Real estate | 2025 |
| Pennine Property Services Limited | Wholesale & retail | 2003 |
| Peppania Spices UK Ltd | Wholesale & retail | 2025 |
| Perceval Amusements Group Ltd | Arts & recreation | 2025 |
| Performance Level Solutions Ltd | Professional & scientific | 2007 |
| Perkins Financial Services Ltd | Real estate | 2017 |
| Pervenio Ltd | Real estate | 2025 |
| Peter Killen Engineering Ltd | Professional & scientific | 2023 |
| Phoenix Foods Consulting Limited | Hospitality | 2026 |
| Phone Shop 3 Ltd | Other services | 2021 |
| Phph Limited | Construction | 2025 |
| Picture IT Cumbria Ltd | Wholesale & retail | 2017 |
| Pingclean Ltd | Administrative & support | 2026 |
| Pipeline Engineering Services Limited | Real estate | 1997 |
| Pizzeria Flame Grill Ltd | Hospitality | 2023 |
| PJR Nuclear Consultancy Limited | Professional & scientific | 2024 |
| PJW Dental Ltd | Health & social care | 2023 |
| PN Homes Cumbria Ltd | Real estate | 2025 |
| POD (North West) Limited | Manufacturing | 2012 |
| POD Groundworks Limited | Administrative & support | 2021 |
| Polo Golbal Ltd | Wholesale & retail | 2024 |
| Ponentine Five Limited | Administrative & support | 2005 |
| Poppies Childcare (Cumbria) Limited | Education | 2014 |