| Piran Surf Limited | Wholesale & retail | 2005 |
| Piranha Cafe CIC | Arts & recreation | 2024 |
| Pivotpoint Consulting Ltd | Professional & scientific | 2025 |
| Pixelated Visuals Ltd | Information & communication | 2012 |
| Pizza Jockeys Ltd | Hospitality | 2020 |
| PJW Property Services Limited | Real estate | 2016 |
| PK Pollys Ltd | Other services | 2026 |
| PK Trading (SW) Ltd | Wholesale & retail | 2021 |
| Planet a Ltd | Professional & scientific | 2019 |
| Planet a Solutions CIC | Professional & scientific | 2019 |
| Planning Progress Limited | Professional & scientific | 2012 |
| Plant and Vehicle Rental Limited | Administrative & support | 2023 |
| Plant One Cornwall Community Interest Company | Agriculture & fishing | 2021 |
| Playatuna Ltd | Agriculture & fishing | 2024 |
| Playerverse Limited | Information & communication | 2023 |
| Pleasant Care Limited | Health & social care | 2001 |
| Pleasure Wave Limited | Health & social care | 2014 |
| Plumbtastic Boiler Solutions Limited | Construction | 2022 |
| Plutus Strategies Ltd | Professional & scientific | 2013 |
| PMS Building (Cornwall) Limited | Construction | 2014 |
| Pobble Education Ltd | Information & communication | 2011 |
| Pobworks Ltd | Professional & scientific | 2021 |
| POD Cafe Portreath Limited | Hospitality | 2025 |
| Poets Corner (Plymouth) Management Company Limited | Real estate | 2018 |
| Poldice Properties Limited | Real estate | 1965 |
| Polhendra Investments LLP | | 2021 |
| Pollard Joinery Ltd | Administrative & support | 2016 |
| Polmanter Limited | Hospitality | 2010 |
| Polmenna Pools Ltd | Construction | 2014 |
| Polmenna Vets Ltd | Professional & scientific | 2005 |
| Polsue Manor Farm | | 1993 |
| Poltair Close (Barripper) Management Company Limited | Households | 2020 |
| Poltair Close Ltd | Construction | 2019 |
| Poltair Housing Ltd | Construction | 2016 |
| Poltair Vale (27-30) Management Company Limited | Households | 2006 |
| Poltair Vale (39-50) Management Company Limited | Households | 2006 |
| Poltesco Rogers Ltd. | Professional & scientific | 2017 |
| Polurrian Hotel Limited | Hospitality | 1947 |
| Polvenna Limited | Water & waste | 2025 |
| Polwhele House Limited | Education | 2010 |
| Polwhele Ltd | Professional & scientific | 2018 |
| Ponnek Ltd | Wholesale & retail | 2021 |
| Ponsanooth Hall Management Company | Arts & recreation | 2010 |
| Ponsharden Services Limited | Extraterritorial | 2004 |
| Ponsvale Residents Association Limited | Administrative & support | 2009 |
| Pool of Energy Limited | Extraterritorial | 2010 |
| Poplars Court Management Company Limited | Households | 1993 |
| Poppanoodle Theatre Ltd | Administrative & support | 2023 |
| Port Pendennis Boat Charters Ltd | Transport & logistics | 2024 |
| Porth Enodoc Property Management Company Limited | Households | 2002 |
| Porth Nazara Ltd | Manufacturing | 2026 |
| Porthbean Limited | Arts & recreation | 2002 |
| Porthcurnick Ltd | Wholesale & retail | 2024 |
| Porthdigital Ltd | Professional & scientific | 2025 |
| Porthgwidden Estate Limited | Households | 1974 |
| Porthmuer CIC | Manufacturing | 2025 |
| Porthtowan Tourist Park Limited | Hospitality | 2017 |
| Portscatho Stores Ltd | Wholesale & retail | 2018 |
| Positive Growth Solutions Ltd | Professional & scientific | 2025 |
| Posteezz Limited | Transport & logistics | 2024 |
| PPP Enterprises Limited | Extraterritorial | 1996 |
| PR4PHOTOS Ltd | Professional & scientific | 2013 |
| Prakshi Limited | Real estate | 2024 |
| Pralla Consulting Ltd | Professional & scientific | 2026 |
| Prase Properties Limited | Real estate | 2025 |
| Precision Homes (South West) Ltd | Construction | 2016 |
| Precision Projects Cornwall Ltd | Construction | 2024 |
| Precision Tiling and Flooring Ltd | Construction | 2025 |
| Premier Forecourts (Longdowns) Limited | Wholesale & retail | 2014 |
| Premier View Ltd | Health & social care | 2021 |
| Prenassa Limited | Real estate | 2023 |
| Prenn Engineering Ltd. | Construction | 2022 |
| Prenn Landscapes Ltd | Agriculture & fishing | 2024 |
| Prestige Deanwide Ltd | Real estate | 2026 |
| Pretty Wild Spaces Ltd | Administrative & support | 2005 |
| Primrose Fields Management Company Limited | Households | 2025 |
| Primrose Valley Hotel 2015 Limited | Hospitality | 2015 |
| Prinda.Ai Ltd | Information & communication | 2026 |
| Prinsloo-Rowe Limited | Arts & recreation | 2023 |
| Print 2 Media Limited | Manufacturing | 2008 |
| Pritchmor Holdings Limited | Real estate | 2001 |
| Pro-Line Window Company Limited | Construction | 2024 |
| Probus Medicines Limited | Wholesale & retail | 2021 |
| Probus Surgery Limited | Health & social care | 2010 |
| Progressive Components (Europe) Limited | Wholesale & retail | 2003 |
| Project Construction SW Ltd | Construction | 2015 |
| Project Developments South West Limited | Construction | 2021 |
| Projectunit Property Management Limited | Households | 1988 |
| Promenade Dental Limited | Health & social care | 2024 |
| Propalian Ltd | Information & communication | 2020 |
| Proper Leisure Limited | Arts & recreation | 2008 |
| Propertysurveysouthwest Ltd | Professional & scientific | 2021 |
| Prospero Consultancy Ltd | Professional & scientific | 2005 |
| Protiga Limited | Administrative & support | 2025 |
| Proud Holdings Limited | Financial services | 2016 |
| Proud Properties Cornwall Limited | Real estate | 2016 |
| Provedore Trading Ltd | Hospitality | 2020 |
| Proven Studio Limited | Professional & scientific | 2025 |
| Providence Park Ltd | Construction | 2019 |
| Pryor Dairying Limited | Agriculture & fishing | 2013 |