| P a & C a Medical Ltd | Health & social care | 2019 |
| P and P Bodyworks Limited | Manufacturing | 2015 |
| P K Frampton LP | | 2014 |
| P L Cane Investments Limited | Real estate | 1970 |
| P S Moore Limited | Construction | 2010 |
| P&A Lettings Limited | Real estate | 2026 |
| P&L Frampton and Sons Limited | Agriculture & fishing | 2014 |
| P&M Contractors Ltd | Construction | 2026 |
| P. Kerley Contractor Ltd | Administrative & support | 2012 |
| P.A.Burridge & Sons Limited | Construction | 1961 |
| P.K. Meats Limited | Wholesale & retail | 2007 |
| P.R. Elford Limited | Construction | 2008 |
| PA Law Limited | Professional & scientific | 2024 |
| Pacewell Limited | Hospitality | 2025 |
| Pagan Hospitality Ltd | Hospitality | 2025 |
| Pageant Properties Limited | Real estate | 1980 |
| Paice Building Services Ltd | Construction | 2018 |
| Paints 'N' Plates Ltd | Wholesale & retail | 2025 |
| Paktexuk Ltd | Wholesale & retail | 2023 |
| Palace Court (Dorchester) Management Company Limited | Households | 1986 |
| Pallington Enterprises Ltd | Agriculture & fishing | 2022 |
| Palm Digital Marketing Agency Limited | Professional & scientific | 2025 |
| Palmanda Properties Limited | Households | 1975 |
| Pandorex Ltd | Real estate | 2013 |
| Panemorfii Ltd | Wholesale & retail | 2021 |
| Paraco Limited | Wholesale & retail | 2020 |
| Paradebase Limited | Administrative & support | 1994 |
| Parham Development Limited | Construction | 1988 |
| Parham Enterprises Limited | Real estate | 2025 |
| Parham Holdings Limited | Professional & scientific | 1995 |
| Parham Investment Limited | Construction | 1989 |
| Parity Health and Safety Ltd | Administrative & support | 2016 |
| Park Farm Court Residents Association Limited | Households | 2018 |
| Park View Enterprises Ltd | Real estate | 2021 |
| Parker Homes (UK) Limited | Construction | 2013 |
| Parker Management Ltd | Real estate | 2021 |
| Parkmans Property Limited | Real estate | 2020 |
| Parsons Court Management Company Limited | Households | 1981 |
| Partbridge Ltd | Wholesale & retail | 2005 |
| Particle Productions Ltd | Administrative & support | 2010 |
| Partquest Company Limited | Wholesale & retail | 2019 |
| Passage Close Management Co Ltd | Households | 2014 |
| Passedit Limited | Information & communication | 2001 |
| Patching & Miller Ltd | Professional & scientific | 2019 |
| Pateli Properties Limited | Real estate | 2021 |
| Patz UK Limited | Professional & scientific | 2009 |
| Paul Cocks Wines Ltd | Wholesale & retail | 2026 |
| Paul Temple Associates Limited | Other services | 1999 |
| Paul Whittaker Limited | Financial services | 2023 |
| Pavilion in the Park (Pips) Ltd | Hospitality | 2020 |
| Pavilion Road Holdings Limited | Real estate | 2015 |
| Pavilion Yard (Poundbury) Management Company Limited | Real estate | 2018 |
| PC Solar Panel Proofing Ltd | Administrative & support | 2025 |
| PCI Scientifix Ltd | Wholesale & retail | 2024 |
| Pdbt Limited | Administrative & support | 2010 |
| PDF Hire Limited | Administrative & support | 2001 |
| PDF Holdings Ltd | Other services | 2018 |
| PDQ Recycling Ltd | Water & waste | 2025 |
| Peaceful Poultry Limited | Agriculture & fishing | 1985 |
| Pearce Estates Limited | Real estate | 2012 |
| Pearse Psychiatry Limited | Health & social care | 2015 |
| Pebblebank Building & Developments Limited | Construction | 2018 |
| Pefkon Services Limited | Other services | 2018 |
| Pegasus Groundworks Ltd | Administrative & support | 2024 |
| Pelagus Marine Limited | Manufacturing | 2016 |
| Pelican House Eight Ltd. | Real estate | 2025 |
| Pelican House Five Ltd. | Real estate | 2025 |
| Pelican House Four Ltd. | Real estate | 2025 |
| Pelican House Nine Ltd. | Real estate | 2025 |
| Pelican House One Ltd. | Real estate | 2025 |
| Pelican House Seven Ltd. | Real estate | 2025 |
| Pelican House SIX Ltd. | Real estate | 2025 |
| Pelican House TEN Ltd. | Real estate | 2025 |
| Pelican House Three Ltd. | Real estate | 2025 |
| Pelican House Two Ltd. | Real estate | 2025 |
| Pembury Property Investment Company Limited(The) | Real estate | 1959 |
| Pendrew Limited | Professional & scientific | 2007 |
| Penta GRP Limited | Manufacturing | 2025 |
| People First Dorset | Other services | 2004 |
| People Magazines Limited | Hospitality | 2010 |
| Perchvend Development Co. Limited | Households | 1986 |
| Perfect Media Group Limited | Arts & recreation | 2014 |
| Perfect Party Tents Ltd | Administrative & support | 2022 |
| Performance Climate Systems Limited | Professional & scientific | 2017 |
| Performance First Limited | Professional & scientific | 2001 |
| Performance Management Group Limited | Professional & scientific | 2017 |
| Perman Consulting Limited | Professional & scientific | 2020 |
| Perpendicular Ltd | Hospitality | 2018 |
| Perrins Hill Ltd | Agriculture & fishing | 2012 |
| Pest Control 24-7 Dorset Limited | Administrative & support | 2022 |
| Peter George Electrical Limited | Construction | 2006 |
| Peter Gunning & Partners LLP | | 2009 |
| Peter Ives Limited | Agriculture & fishing | 1964 |
| Peter Lane Properties Ltd | Real estate | 2018 |
| Peter Winterbottom Management Limited | Professional & scientific | 2012 |
| Peter Woodruff Limited | Construction | 2003 |
| Peterhead Fabrication Services Limited | Construction | 2017 |
| PF Sequel Limited | Professional & scientific | 2023 |
| PFS Network Limited | Construction | 2005 |
| PG Economics Limited | Professional & scientific | 1999 |