| Palm Court Weymouth RTM Company Limited | Households | 2010 |
| Palmer Care Ltd | Health & social care | 2003 |
| Palmer Estates Ltd | Construction | 2007 |
| Palmer Homes Limited | Construction | 1998 |
| Palmytown Limited | Real estate | 2022 |
| Pandamonium DTH Limited | Health & social care | 2025 |
| Pangalin Holdings Ltd | Real estate | 2025 |
| Panlaan Spa Ltd | Other services | 2021 |
| Pannell & Partners Limited | Professional & scientific | 2024 |
| Paradise Circus Group. Ltd. | Manufacturing | 2012 |
| Paradise Technology Limited | Information & communication | 1994 |
| Paramount Catering Company Limited | Real estate | 1964 |
| Park Laundry and DRY Cleaning Limited | Other services | 2010 |
| Park Street Practice Limited | Health & social care | 2013 |
| Parker's Healthcare Limited | Financial services | 2025 |
| Parkers Property Consultants and Valuers Ltd | Real estate | 2009 |
| Parkmead Developments Ltd | Real estate | 2006 |
| Passione Poole Ltd | Hospitality | 2016 |
| Passtures New Ltd | Education | 2008 |
| Paul Starkey Surveyor Limited | Professional & scientific | 2020 |
| Paul Windess Cleaning Services Limited | Administrative & support | 2011 |
| Paul’S Yard Properties Ltd | Real estate | 2026 |
| PB Projects SW Limited | Arts & recreation | 2019 |
| PBH Services Limited | Professional & scientific | 2026 |
| PCS Weymouth Limited | Administrative & support | 2021 |
| Pds.Ec Limited | Professional & scientific | 2008 |
| Peacehaven Estates Ltd | Real estate | 2023 |
| Peach Engineering Ltd | Manufacturing | 2000 |
| Pearsons Consulting Ltd | Professional & scientific | 2016 |
| Pebblebank Limited | Hospitality | 2012 |
| Pebbles West Bexington Limited | Real estate | 2018 |
| Pebblestone Properties Ltd | Administrative & support | 2009 |
| Peech Building Services Limited | Construction | 2010 |
| Pelagon Systems Ltd | Professional & scientific | 2012 |
| Pengillys LLP | | 2009 |
| Pengover House Management Limited | Households | 2003 |
| Pennywise Advisory Services Limited | Administrative & support | 2015 |
| Pennywise Dorchester FS Limited | Financial services | 2011 |
| Pennywise FS Limited | Professional & scientific | 2010 |
| Pennywise Property Holdings Limited | Real estate | 2020 |
| Perfect Blinds Dorset Ltd | Construction | 2023 |
| Performance Interiors Limited | Construction | 2006 |
| Performance Sportswear Ltd | Wholesale & retail | 2024 |
| Pering&Hogg Limited | Professional & scientific | 2025 |
| Permavent Limited | Wholesale & retail | 2003 |
| Perrin Design & Build Ltd | Construction | 2019 |
| Petconnectapp Ltd | Wholesale & retail | 2024 |
| Pete Warwick Tiling Limited | Construction | 2013 |
| Peter Bower Motor Vehicle Repairs Limited | Wholesale & retail | 2002 |
| Peters Prints Ltd | Wholesale & retail | 2024 |
| PGR Properties 2024 Ltd | Real estate | 2024 |
| Pharaoh Property Investments Ltd | Construction | 2023 |
| Phase Three Residential Ltd | Real estate | 2025 |
| Phil Gough Health & Fitness Ltd | Arts & recreation | 2013 |
| Philbrick Properties Limited | Real estate | 2024 |
| Phoenix Care & Support Services 24/7 Ltd | Other services | 2011 |
| Phoenix House (Dorset) Management Company Limited | Households | 2025 |
| Phoenix Maintenance Ltd | Construction | 2010 |
| Phoenix Property & Portfolio Management Limited | Real estate | 2015 |
| Phytonutrition Ltd | Manufacturing | 2025 |
| Pickled Green Frog Ltd | Hospitality | 2018 |
| Piddle Valley Vets Limited | Professional & scientific | 2019 |
| Pike and Shot Events Limited | Other services | 2009 |
| Pioneer Electrical Limited | Construction | 2001 |
| Pioneer Shopfitting Limited | Construction | 1999 |
| Pirate Grips Ltd | Information & communication | 2016 |
| Pitchcott Hill Farms Holdings Limited | Agriculture & fishing | 2020 |
| Pittards 1826 Limited | Manufacturing | 2025 |
| Pizza Amicos Ltd | Hospitality | 2025 |
| Pizza Napoli Dorset Ltd | Wholesale & retail | 2011 |
| PJS Property Solutions Ltd | Real estate | 2026 |
| Planet AXE Limited | Arts & recreation | 2023 |
| Plant World (Contracting) Limited | Construction | 2001 |
| Plant World Limited | Wholesale & retail | 2001 |
| Playedit Records Ltd | Information & communication | 2020 |
| PLS Property SW Limited | Real estate | 2019 |
| Plum Roll Productions Ltd | Other services | 2001 |
| PM Squared (UK) Limited | Extraterritorial | 2013 |
| PMC by Claire Louise Ltd | Health & social care | 2015 |
| Pmduk Limited | Arts & recreation | 2019 |
| Pogles Wood Florist Ltd | Wholesale & retail | 2013 |
| Pointevecchio Poole Limited | Real estate | 2012 |
| Polish Link Limited | Information & communication | 2011 |
| Pollak Properties Ltd | Real estate | 2025 |
| Pollard's Precious Pets Dog Boarding Limited | Other services | 2024 |
| Pooch Lagoon Limited | Wholesale & retail | 2025 |
| Porter T H D Limited | Other services | 2025 |
| Porter's Farm Ltd | Agriculture & fishing | 2025 |
| Portesham Dairy Farm Campsite Ltd | Hospitality | 2021 |
| Portesham Farm Ltd | Agriculture & fishing | 2018 |
| Portland Heat Treatment Company Limited | Manufacturing | 1981 |
| Portland Island Tours Limited | Administrative & support | 2015 |
| Portland Nature Retreat Ltd | Wholesale & retail | 2023 |
| Portland Plant Hire Limited | Construction | 2015 |
| Portland Power Systems Limited | Professional & scientific | 2026 |
| Portland Project Services Ltd | Construction | 2025 |
| Portland Scrap Metal Ltd | Water & waste | 2012 |
| Portland Skips Limited | Water & waste | 2011 |
| Portland Stone Limited | Water & waste | 1995 |
| Portland Stone Mines Limited | Mining & quarrying | 2021 |