| My Little Beach Boutique Limited | Wholesale & retail | 2019 |
| My-E-Health UK Limited | Health & social care | 2022 |
| Myblondelox Ltd | Wholesale & retail | 2025 |
| Mylor Bridge Project Limited | Construction | 2020 |
| Mylor Consulting Ltd | Health & social care | 2019 |
| Mylor Ventures Limited | Professional & scientific | 2013 |
| MYW Ltd | Real estate | 2015 |
| N & C Property Developments (Truro) Limited | Construction | 2025 |
| N & C Property Investments (Cornwall) Ltd | Construction | 2021 |
| N & S Hiney Limited | Other services | 2012 |
| N J Glanville (Cornwall) Limited | Manufacturing | 2003 |
| N L Martin Limited | Professional & scientific | 2014 |
| Na-Mor Agencies Limited | Wholesale & retail | 2015 |
| Naimans UK Ltd | Wholesale & retail | 2003 |
| Nalders LLP | | 2010 |
| Nanat Limited | Wholesale & retail | 2018 |
| Nankilly Farm Ltd | Hospitality | 2026 |
| Nanscothan Management Limited | Households | 2002 |
| Nanshuthall Ltd | Real estate | 2024 |
| Nanshuttal Farm LLP | | 2019 |
| Nansidwell Farm Limited | Extraterritorial | 1983 |
| Nanteague Farm Limited | Real estate | 2026 |
| Napton Developments Limited | Construction | 2024 |
| Narabo Solutions Ltd | Administrative & support | 2016 |
| Nard Industries Ltd | Arts & recreation | 2022 |
| Nare Point Ltd | Real estate | 2016 |
| Nathan Campling Specialist Flooring and Walling Ltd | Construction | 2010 |
| Nathan Group of Industries Ltd | Manufacturing | 2020 |
| Nathan Outlaw Consultancy Ltd | Hospitality | 2013 |
| Naturally Learning Limited | Other services | 2012 |
| Naturally Learning Training Ltd | Other services | 2024 |
| Naughtynonnas Ltd | Hospitality | 2025 |
| Navas Drinks Limited | Other services | 2018 |
| Navigating Conservation & Development Ltd | Professional & scientific | 2021 |
| Nazim Properties Ltd | Real estate | 2020 |
| Nccl Holding Limited | Information & communication | 2024 |
| NCW Technical Services Ltd | Professional & scientific | 2016 |
| NDT South West Ltd | Administrative & support | 2020 |
| Neadl Limited | Information & communication | 2025 |
| Nearwater Walking Holidays Limited | Administrative & support | 2010 |
| Neet Media Limited | Wholesale & retail | 2008 |
| NEL Media Ltd | Information & communication | 2024 |
| Nelson Rare Wine Ltd | Wholesale & retail | 2021 |
| Nest Property Restorations Ltd | Construction | 2023 |
| NET Hotel 4 Limited | Financial services | 2024 |
| NET Saver Trading Ltd | Wholesale & retail | 2019 |
| Netherfield Access Limited | Real estate | 2022 |
| Netherton's Ltd | Arts & recreation | 2014 |
| Nettleton Holdings Limited | Professional & scientific | 2002 |
| Nettleton Properties Limited | Real estate | 2000 |
| Neuroads 2 HLP Limited | Health & social care | 2026 |
| New Beginning Community Association (Malabar) | Other services | 2009 |
| New Generation Daffodils Limited | Agriculture & fishing | 2001 |
| New Wave Accounting Limited | Professional & scientific | 2022 |
| Newburne Munn Limited | Professional & scientific | 2013 |
| Newham BID Ltd | Administrative & support | 2026 |
| Newham House Management Company Limited | Households | 2001 |
| Newham Quay Management Limited | Households | 1988 |
| Newham Quay Property Limited | Real estate | 2015 |
| Newham Road Carwash Ltd | Administrative & support | 2025 |
| Newlands Capital 1 LLP | | 2020 |
| Newlands Capital Limited | Professional & scientific | 2019 |
| Newlyn Contemporary Limited | Wholesale & retail | 2020 |
| Newlyn Farm Partnership LLP | | 2018 |
| Newquay Airport Taxis Ltd | Transport & logistics | 2015 |
| Newquay Airport Transfers Ltd | Transport & logistics | 2015 |
| Newquay Podiatry Ltd | Health & social care | 2015 |
| News & Trader Publications Limited | Professional & scientific | 2002 |
| Nexnix Limited | Information & communication | 1991 |
| Nexus Cornwall Limited | Professional & scientific | 2025 |
| Nflc Limited | Hospitality | 2007 |
| Nicholas Accounting & Services Ltd | Professional & scientific | 2026 |
| Nick Bailey Limited | Professional & scientific | 2023 |
| Nick Baker Technical Films Ltd | Information & communication | 2024 |
| Nick Healey Marine Surveyors Ltd | Professional & scientific | 2024 |
| Nicky Laatz Creations Ltd | Professional & scientific | 2018 |
| Nidlan Movers and Logistics Ltd | Transport & logistics | 2025 |
| Nigel Tipple Associates Ltd | Professional & scientific | 2025 |
| Nightshade Management Ltd | Professional & scientific | 2026 |
| Nijhuis Saur Industries UK & Ireland Limited | Financial services | 2022 |
| Nimaja Limited | Hospitality | 2018 |
| Nimeesha Ltd | Hospitality | 2018 |
| Nine Turns Limited | Transport & logistics | 2009 |
| NINETY3 Biotech Limited | Professional & scientific | 2024 |
| Nisha Ecotrade Limited | Wholesale & retail | 2023 |
| Nite Medical Limited | Health & social care | 2019 |
| Nitsa Consulting Limited | Professional & scientific | 2017 |
| Njpk Ltd | Wholesale & retail | 2017 |
| NO 3 Lemon Street Ltd | Other services | 2017 |
| Noah's ARK Family Project C.I.C. | Health & social care | 2016 |
| Nomadic Hippy Ltd | Arts & recreation | 2025 |
| Nonal Ltd | Manufacturing | 2024 |
| Nori Properties Limited | Real estate | 2020 |
| North Coast Heating Ltd | Construction | 2017 |
| North Coast Inns Limited | Hospitality | 2012 |
| North Corner Management Company Limited | Households | 2004 |
| North Diving Limited | Arts & recreation | 2015 |
| Northshore Geological Ltd | Professional & scientific | 2019 |
| Northwood (Cornwall) Limited | Real estate | 2009 |
| NOT Very Rude Ltd | Financial services | 2021 |