| Nick Holbrook Trading & Consultancy Ltd | Wholesale & retail | 2014 |
| Nick Kaye Services Limited | Health & social care | 2010 |
| Nico Health Ltd | Information & communication | 2025 |
| Nicoya Ltd | Professional & scientific | 2018 |
| Nijpk Ltd | Wholesale & retail | 2019 |
| Nikki White Therapy CIC | Health & social care | 2021 |
| Nineplus Limited | Arts & recreation | 2009 |
| Nirvana Vets Ltd | Professional & scientific | 2021 |
| Nitoe Group Limited | Administrative & support | 2019 |
| NJP Welding Limited | Manufacturing | 2011 |
| NMC (Cornwall) Ltd | Arts & recreation | 1998 |
| NO. 37 Cornwall Ltd | Real estate | 2024 |
| NO.3 O L G Limited | Hospitality | 2016 |
| NOA Surf Collective CIC | Wholesale & retail | 2023 |
| Noah:Pm Ltd | Construction | 2023 |
| Noble Pour Ltd | Hospitality | 2025 |
| Norfolk House Properties Limited | Real estate | 2015 |
| North Coast Chiropractic Ltd | Health & social care | 2014 |
| North Coast Enterprise Group Limited | Hospitality | 2025 |
| North Coast Medical Limited | Health & social care | 2019 |
| North Peak Carpentry Ltd | Manufacturing | 2018 |
| North Shore Surf Shop Limited | Wholesale & retail | 2023 |
| North Shore Training Limited | Administrative & support | 2007 |
| Northgate Construction SW Ltd | Construction | 2025 |
| Norwegian Residential Limited | Professional & scientific | 2011 |
| NOT the Farmers Dog Newquay Limited | Wholesale & retail | 2026 |
| NOT1MORE | Professional & scientific | 2018 |
| Nova HR Ltd | Administrative & support | 2025 |
| Novaria Pluss Ltd | Wholesale & retail | 2025 |
| NU Solutions Group Ltd | Professional & scientific | 2015 |
| Numara Ltd | Wholesale & retail | 2026 |
| Number 22 Limited | Real estate | 2016 |
| Number Fifty Two Ltd | Arts & recreation | 2015 |
| Nurture Day Nursery & PRE School Limited | Education | 2011 |
| O P Williams Limited | Professional & scientific | 2019 |
| OAH Cornwall Ltd | Hospitality | 2025 |
| Oakleigh Electrical Contractors Limited | Construction | 2019 |
| Oakwood Barn Lane Management Company Limited | Households | 2024 |
| OC Interiors SW Ltd | Construction | 2026 |
| OC Plumbing & Heating SW Ltd | Construction | 2026 |
| OC Technology Ltd | Administrative & support | 2019 |
| Ocean Blue Management Company Limited | Households | 2005 |
| Ocean Carpentry Ltd | Manufacturing | 2025 |
| Ocean Construction SW Ltd | Construction | 2018 |
| Ocean Management (1) Limited | Real estate | 2006 |
| Ocean One Freehold Limited | Real estate | 2022 |
| Offshore Productions Ltd | Professional & scientific | 2022 |
| Ohana Property Management Limited | Households | 2026 |
| Ohkay Trading Limited | Wholesale & retail | 2019 |
| OIL Tanks Cornwall Limited | Construction | 2013 |
| OJW Services Limited | Professional & scientific | 2025 |
| Old Vicarage (ST. Columb) Management Comany Limited | Real estate | 2006 |
| Olympic Offshore Wind Ltd. | Professional & scientific | 2022 |
| OM Realty Ltd | Real estate | 2016 |
| Omega 7 Consulting Limited | Financial services | 2012 |
| Omega Medical Services Limited | Health & social care | 2022 |
| One & ALL Homes Limited | Construction | 2023 |
| One & ALL Properties Limited | Construction | 2025 |
| One Lusty Glaze Management Company Limited | Households | 2016 |
| One Lusty Glaze RTM Company Limited | Households | 2022 |
| One OFF Property Co Ltd | Construction | 2022 |
| One Planet Associates Limited | Other services | 2019 |
| One PPC Ltd | Professional & scientific | 2013 |
| One Trenance Road (Newquay) Management Company Limited | Administrative & support | 2009 |
| Opac Management Limited | Real estate | 2007 |
| Open Skies Network Ltd | Transport & logistics | 2024 |
| Opportunity Oceanographic Ltd. | Professional & scientific | 2021 |
| Opscaling Ltd | Professional & scientific | 2024 |
| Orchard Aviation Limited | Manufacturing | 2021 |
| Organic Digital Ltd | Information & communication | 2026 |
| Orilum Ltd | Information & communication | 2026 |
| Orsus Consulting Ltd | Professional & scientific | 2018 |
| OSM House (Freehold) Limited | Households | 2019 |
| Osscarr Group Limited | Wholesale & retail | 2018 |
| Otio Collective Ltd | Extraterritorial | 2022 |
| Otto Associates Holdings Limited | Financial services | 2023 |
| Otto Associates Limited | Administrative & support | 2020 |
| Otto Aviation Limited | Manufacturing | 2019 |
| Outdoor Activity Instructor Academy Ltd | Other services | 2021 |
| Owen Corp Limited | Financial services | 2023 |
| P R Weldhen Plant Limited | Construction | 2011 |
| P T Controls Limited | Information & communication | 2014 |
| P.D.A. European Limited | Transport & logistics | 2005 |
| Paddle Creative Ltd | Professional & scientific | 2022 |
| Pads in Plymouth Limited | Hospitality | 2018 |
| Padstow Freehold Limited | Households | 2024 |
| Pain Reframe Ltd | Health & social care | 2021 |
| Palores Construction Ltd | Construction | 2020 |
| Papaya Studio Ltd. | Arts & recreation | 2014 |
| Pargolla Road Holdings Limited | Financial services | 2025 |
| Parker Beach Limited | Real estate | 2019 |
| Parker Beach Olive Tree Limited | Real estate | 2024 |
| Parky Blinders Project CIC | Education | 2025 |
| Party Greener Ltd | Hospitality | 2019 |
| Pascoe Electrical (Cornwall) Limited | Construction | 2026 |
| Pascoes Tyres Ltd | Wholesale & retail | 2024 |
| Past Life Promotions Ltd | Arts & recreation | 2024 |
| Paul David Smith Limited | Information & communication | 2008 |
| Paul Romback Plumbing Services Limited | Construction | 2019 |
| Paulcaffreybuilding Ltd | Administrative & support | 2026 |