| MPA SW Ltd | Wholesale & retail | 2022 |
| MRH Business Analysis Ltd | Information & communication | 2019 |
| MRJ Landscapes Limited | Construction | 2019 |
| Msks Property Ltd | Construction | 2015 |
| MW Management South West Ltd | Extraterritorial | 2025 |
| Narwhal SW Limited | Real estate | 2026 |
| Natalie Trice Publicity Limited | Professional & scientific | 2025 |
| Neil Pearce Fishing Limited | Agriculture & fishing | 2018 |
| Nelson's Cat Cafe Ltd | Hospitality | 2025 |
| Nessiesaurus O'Connori Limited | Extraterritorial | 1987 |
| Nevada Construction Limited | Construction | 2010 |
| Nevada EOT Limited | Professional & scientific | 2025 |
| Nevada Shareholdings Ltd | Construction | 2004 |
| New Devon Army Ltd | Wholesale & retail | 2007 |
| New Kestrel Estates Ltd | Real estate | 2022 |
| Newportfolio Ltd | Real estate | 2026 |
| NO Child Left Indoors Forest School CIC | Education | 2026 |
| NO. 26 Northumberland Place Management Company (Teignmouth) Limited | Households | 2022 |
| North T&I Ltd | Professional & scientific | 2024 |
| Nottingham Watson Ltd | Professional & scientific | 2002 |
| Notzon Advisors Limited | Financial services | 2009 |
| Nova AI SW Limited | Information & communication | 2026 |
| NRD Financial Ltd | Professional & scientific | 2024 |
| O-Pen-I Images Limited | Professional & scientific | 2006 |
| Oakas Limited | Other services | 2008 |
| Oakleaf Training Ltd | Agriculture & fishing | 2024 |
| Oakmil Developments Limited | Construction | 2006 |
| Oakprice Limited | Health & social care | 1999 |
| Occupational Therapy Pathways to Potential Ltd | Public administration | 2025 |
| Old Nursery Holidays Ltd | Administrative & support | 2016 |
| Olushu Ltd | Wholesale & retail | 2021 |
| Operation Imprezza | Other services | 2012 |
| Orchard END (Newton Abbot) Management Company Limited | Households | 2026 |
| Orchard Property Management (Devon) Limited | Construction | 2007 |
| Organised Chaos Teignmouth CIC | Education | 2025 |
| Ortus Group Ltd | Professional & scientific | 2020 |
| Osborne House Management Company (Shaldon) Limited | Real estate | 2006 |
| Oscar Bravo Box Co. Ltd | Administrative & support | 2023 |
| Otter HR Limited | Administrative & support | 2008 |
| Otterycove Management Company Limited | Households | 1994 |
| Owain Winfield Associates Ltd | Administrative & support | 2026 |
| Oxford Nutrition Limited | Wholesale & retail | 1983 |
| P & P Lifts Limited | Construction | 2002 |
| P L Engineering Ltd | Construction | 2018 |
| P&V Specialist Services Ltd | Administrative & support | 2025 |
| P.J.'s Care & Support Networks Ltd | Health & social care | 2024 |
| Paradise Design and Build Ltd | Administrative & support | 2016 |
| Park Green Investments Limited | Real estate | 1993 |
| Parkworx Limited | Construction | 2017 |
| Pasa Developments Limited | Real estate | 2022 |
| Pasa Property Management Limited | Real estate | 2023 |
| Pathways for Progress Limited | Professional & scientific | 2025 |
| Paul Crooks Design Limited | Professional & scientific | 2002 |
| Paul Northcott Consultancy Ltd | Professional & scientific | 2016 |
| Pavilions Enterprises Limited | Information & communication | 2015 |
| PB Suite Ltd | Arts & recreation | 2018 |
| PDL Club Ltd | Wholesale & retail | 2025 |
| Pearce and Clatworthy Limited | Construction | 2018 |
| Pearl Properties SW Ltd | Households | 2025 |
| Pearl's Parlour Teignmouth Ltd | Hospitality | 2020 |
| Pebble Beach Cafe and Takeaway Limited | Hospitality | 2025 |
| Penlee Development Limited | Real estate | 2007 |
| Penlee Holdings Ltd | Real estate | 2021 |
| Penrhyn House Holidays Ltd | Hospitality | 2022 |
| Pepe & Rose Ltd | Professional & scientific | 2022 |
| Performance Management Consultancy Limited | Professional & scientific | 2005 |
| Perle Partnership Limited | Professional & scientific | 2018 |
| Peter Lewis Engineering Limited | Construction | 2016 |
| Peter Straker Limited | Arts & recreation | 2020 |
| Phillip Drew Limited | Construction | 2003 |
| Phillips Brothers Truckin Ltd | Transport & logistics | 2025 |
| Phipps Catering Ltd | Hospitality | 2024 |
| Phoebe Developments Ltd | Construction | 2000 |
| Phoenix Nebula Limited | Information & communication | 2016 |
| Phoenix Rising MK Community Interest Company | Health & social care | 2017 |
| Phone Solutionz Ltd | Wholesale & retail | 2019 |
| Pickup People HR Ltd | Professional & scientific | 2025 |
| Pierhead 1 Ltd | Administrative & support | 2019 |
| Pierhead Cafes & Bars Ltd | Hospitality | 2019 |
| Pike Ward Limited | Transport & logistics | 1925 |
| Pixie Perfect Ltd | Other services | 2022 |
| Pixoft Diagnostic Imaging Limited | Information & communication | 1986 |
| Planet Solutions UK Ltd | Professional & scientific | 2009 |
| Playford Properties Ltd | Construction | 2023 |
| Plectrumb Limited | Construction | 2014 |
| PLG Investments Ltd | Real estate | 2021 |
| Plum Devon Limited | Real estate | 1960 |
| Plumbsure Services (SW) Limited | Construction | 2021 |
| Plus One Sales Limited | Wholesale & retail | 2015 |
| Porter Planning Economics Ltd | Professional & scientific | 2017 |
| Powered NOW Ltd | Information & communication | 2011 |
| Powered UP SW Electrical Contractors Limited | Construction | 2024 |
| Premier Accountancy and Probate Limited | Professional & scientific | 2017 |
| Prestige Property Landscapes Ltd | Construction | 2025 |
| Prime-X-Press Limited | Wholesale & retail | 2025 |
| Princes Point Management Company Limited | Households | 2001 |
| Principal Bond Limited | Financial services | 1987 |
| Pro Cycle Centre Ltd | Wholesale & retail | 2011 |
| Procards Digital Limited | Information & communication | 2010 |
| Progressing Education Ltd | Education | 2020 |