| Mccarthys SW Ltd | Wholesale & retail | 2015 |
| MED ED Worldwide Limited | Education | 2020 |
| Medics and Rescue Ltd | Education | 2022 |
| Menheniot Looe Cricket Club Ltd | Arts & recreation | 2021 |
| MEP Property Ltd | Construction | 2017 |
| Merlin Industrial Products Limited | Wholesale & retail | 1994 |
| Merrymeet Residents Association Ltd | Other services | 2025 |
| Mews Court (Menheniot) Limited | Households | 1975 |
| MFX Solutions Limited | Information & communication | 2007 |
| MID Devon Heating Centre Ltd | Wholesale & retail | 2025 |
| Mightymilton Ltd | Wholesale & retail | 2026 |
| Millbrase Limited | Financial services | 2017 |
| Miners Choice Ltd | Manufacturing | 2023 |
| Minions Tearoom & Shop Limited | Wholesale & retail | 2023 |
| Mira 2025 Ltd | Real estate | 2025 |
| MKA Property (South West) Ltd | Real estate | 2020 |
| MKS Leisure Ltd | Hospitality | 2010 |
| MKY Joinery Ltd | Construction | 2020 |
| Mobility Media Ltd | Professional & scientific | 2023 |
| Momentum Elearning Ltd | Information & communication | 2010 |
| Moor 2 Shore Ltd | Other services | 2018 |
| Moor Heat Limited | Agriculture & fishing | 2010 |
| Moor JAM Please Limited Partnership | | 2018 |
| Moor Pods Limited | Hospitality | 2025 |
| Moor Power Services Limited | Construction | 2024 |
| Moor View Alpacas Ltd | Agriculture & fishing | 2023 |
| Morcom Court Property Care Company Limited | Real estate | 2000 |
| Morrells Yard Freehold Ltd | Real estate | 2017 |
| Morrells Yard Management Limited | Real estate | 2016 |
| Morweth View Limited | Households | 2007 |
| MSA HD Limited | Health & social care | 2025 |
| Mshtech Ltd | Information & communication | 2017 |
| MVB Asset Holdings Limited | Construction | 2021 |
| MVB Asset Management Limited | Real estate | 2020 |
| My Continuum Financial Ltd | Financial services | 2015 |
| Mystery Ninja LLP | | 2024 |
| Nailzee Point Residents Association Limited | Households | 2006 |
| Narla Cornwall Ltd | Hospitality | 2024 |
| NAS General Trading Company Ltd | Wholesale & retail | 2022 |
| NAS World Market Ltd | Wholesale & retail | 2023 |
| Nature Culture Network CIC | Education | 2024 |
| Neil Louis Hoing Limited | Extraterritorial | 2025 |
| New Barber Style Ltd | Other services | 2020 |
| Newlands Garage Limited | Wholesale & retail | 2011 |
| Newton Ryder LLP | | 2023 |
| Nick Wickett Hoofcare Ltd | Agriculture & fishing | 2015 |
| Nicola Jayne Senior Limited | Extraterritorial | 2025 |
| Nippers Shellfish Limited T/A Cornish Fish Co. Limited | Wholesale & retail | 2018 |
| NO More Lids Limited | Wholesale & retail | 2022 |
| Noir Collection Limited | Wholesale & retail | 2024 |
| Norman Pearn & Co. Limited | Manufacturing | 1963 |
| North Cornwall Ultrasound Ltd | Health & social care | 2023 |
| North Treviddo Corner Limited | Construction | 2020 |
| North Trewint Limited | Professional & scientific | 2022 |
| Novelli Catering Limited | Hospitality | 2023 |
| Novo Deli Limited | Hospitality | 2026 |
| Nuco Properties Limited | Real estate | 2018 |
| Nurture & Bloom Ltd | Other services | 2021 |
| Oaks Landscaping Cornwall Ltd | Construction | 2012 |
| Oakville Limited | Construction | 2011 |
| Obsidian Wolf Technologies Limited | Information & communication | 2024 |
| Ocean Views Residents Association Limited | Real estate | 2015 |
| Oishibuns Ltd | Hospitality | 2020 |
| Oishicatering Ltd | Hospitality | 2022 |
| OM Services Management Company Ltd | Households | 2014 |
| One Accounting Solution Limited | Professional & scientific | 2023 |
| Opalnest Ltd | Administrative & support | 2024 |
| Optigas South West Limited | Professional & scientific | 2018 |
| Orchard Land Trust Limited | Agriculture & fishing | 2005 |
| Osborne Lifting Services Limited | Construction | 2013 |
| Osmthw Ltd | Extraterritorial | 2015 |
| Outer Path Ltd | Professional & scientific | 2020 |
| P & S Holdings (Cornwall) Limited | Financial services | 2021 |
| P. S. Counter Windows Limited | Construction | 2002 |
| P.S. Counter Developments Limited | Construction | 2018 |
| P.S. Counter Holdings Limited | Administrative & support | 2017 |
| PAM Diamond Therapy & Consultancy Ltd | Health & social care | 2026 |
| Pasties by Post Limited | Transport & logistics | 2022 |
| Paul Marshall Estate Agents Ltd | Real estate | 2022 |
| Paul Ryan Consulting Ltd | Professional & scientific | 2012 |
| Pavlova (ELM) Management Company Limited | Households | 1990 |
| Pavlova (Willow North) Management Company Limited | Households | 1990 |
| Pavlova (Willow South) Management Company Limited | Households | 1990 |
| Paws and Purs Limited | Wholesale & retail | 2024 |
| Pb&J Web Design Ltd | Information & communication | 2021 |
| Pckernow Limited | Information & communication | 2007 |
| Peace of Mind Property Developments Ltd | Construction | 2024 |
| Peake (GB) Limited | Other services | 1991 |
| Peckerwood Developments Ltd | Construction | 2006 |
| Pelyne Consulting Limited | Professional & scientific | 2019 |
| Pelyne Limited | Agriculture & fishing | 2003 |
| Pendruccombe Court Management Company Limited | Households | 1989 |
| Pengelly's Hospitality Limited | Hospitality | 2026 |
| Pengelly's of Tavistock Limited | Wholesale & retail | 2024 |
| Penhale Pantry Ltd | Wholesale & retail | 2021 |
| People Improvement Ltd | Administrative & support | 2011 |
| Perimeters (UK) Limited | Construction | 2017 |
| Pete Crowle Carpentry Limited | Construction | 2006 |
| Pete Tamblyn Sales Ltd | Wholesale & retail | 2021 |
| Pete's Plantery Ltd | Wholesale & retail | 2025 |