| PBO Engineering Limited | Professional & scientific | 1998 |
| PC Doctor (Hampshire) Ltd. | Other services | 2003 |
| PC Ideals Retail Limited | Wholesale & retail | 2008 |
| PDS Builders Limited | Construction | 2006 |
| Peake Estates Limited | Real estate | 1935 |
| Pearce Media Ltd. | Manufacturing | 1990 |
| Pearson Plant & Haulage Ltd | Construction | 2002 |
| Pearsons Consultant Surveyors Limited | Extraterritorial | 1996 |
| PEG Design Limited | Professional & scientific | 2005 |
| Pelgar (Holdings) Limited | Manufacturing | 2004 |
| Pelican Geographics Ltd | Mining & quarrying | 2000 |
| Pendragon Court Limited | Real estate | 1998 |
| People Analytics Ltd | Extraterritorial | 2004 |
| People in Health Group Ltd | Health & social care | 2006 |
| Pet VET Limited | Professional & scientific | 2003 |
| Petaprint Limited | Manufacturing | 2006 |
| Petbookers Limited | Information & communication | 2007 |
| Pete Marett Limited | Information & communication | 2006 |
| Pete Watton & Co Ltd | Construction | 2007 |
| Peter Dawson Tax Consultants Limited | Professional & scientific | 2007 |
| Peter Whittick Builders Limited | Construction | 2004 |
| Peters Basingstoke Limited | Hospitality | 2018 |
| Petersfield Golf Club Limited | Arts & recreation | 1975 |
| Petroleum Products Marketing Limited | Professional & scientific | 2000 |
| Petrou Partnership Limited | Professional & scientific | 2006 |
| Petter Associates Limited | Real estate | 2003 |
| Pewcorner Woodworks Limited | Manufacturing | 2004 |
| Phase One Limited | Wholesale & retail | 1997 |
| Phat Pasties Limited | Wholesale & retail | 2006 |
| Phil Tarr Vedantic College Limited | Health & social care | 2004 |
| Phil Taylor Towbars Limited | Wholesale & retail | 1999 |
| Phoenix Bussing Limited | Professional & scientific | 2003 |
| Phoenix Flowers (UK) Limited | Wholesale & retail | 2003 |
| Phone IT Limited | Extraterritorial | 1999 |
| Phoon Actuarial Resource Solutions Ltd | Other services | 2007 |
| Photic Limited | Professional & scientific | 1999 |
| Picketts and Pursers Limited | Wholesale & retail | 1961 |
| Picture This Creative Limited | Professional & scientific | 2003 |
| PIG Improvement Administration Limited | Professional & scientific | 1955 |
| Pilot View Management Limited | Real estate | 2003 |
| Pinder Plants Ltd. | Administrative & support | 2007 |
| Pine Properties (Gosport) Limited | Households | 1997 |
| Pinto Potts LLP | | 2002 |
| Pisces Conservation Limited | Administrative & support | 1995 |
| Pisces Products Limited | Wholesale & retail | 2002 |
| PJW Contracts Limited | Professional & scientific | 2006 |
| PLAN2GETHER Ltd | Financial services | 2006 |
| Plastona Limited | Professional & scientific | 1961 |
| Platform Media Holdings Limited | Financial services | 2024 |
| Platinum Motorcycles Ltd | Wholesale & retail | 2005 |
| Play Gamer Limited | Information & communication | 2006 |
| Play-Up Football Coaching LLP | | 2023 |
| Playzone (Lincoln) Limited | Arts & recreation | 2001 |
| Ploughley Estates Limited | Construction | 2005 |
| Plustree Ltd | Health & social care | 2025 |
| Plymouth Yacht Haven Limited | Arts & recreation | 1997 |
| PM Creative Limited | Professional & scientific | 2006 |
| PMR Systems Ltd | Manufacturing | 1986 |
| Poggio Limited | Construction | 2003 |
| Polybond Limited | Manufacturing | 2001 |
| Polygon (Southampton) Limited | Hospitality | 2005 |
| Poppy Paving Limited | Construction | 2007 |
| Portal Dingwall & Norris Limited | Wholesale & retail | 2002 |
| Portcullis Doors and Windows Romsey Limited | Professional & scientific | 2003 |
| Portsmouth Aviation Holdings Limited | Manufacturing | 1950 |
| Portsmouth Cardiac Associates Limited | Health & social care | 2003 |
| Portsmouth Holdings Limited | Real estate | 1956 |
| Portsmouth Motor Company Limited | Wholesale & retail | 2004 |
| Portsmouth Surgical Equipment Limited | Manufacturing | 1973 |
| Posh Barbers A1 Ltd | Other services | 2019 |
| Postforce Ltd | Extraterritorial | 2026 |
| Power Tool Sales Ltd | Wholesale & retail | 2002 |
| PPO Systems Limited | Information & communication | 1995 |
| Precision Wargame Supplies Limited | Professional & scientific | 2000 |
| Premier Fire & Safety Systems Limited | Manufacturing | 2006 |
| Premier Recruitment Solutions Limited | Administrative & support | 2005 |
| Pressco Precision Engineering Limited | Manufacturing | 1999 |
| Pretoria News Ltd | Wholesale & retail | 2003 |
| Prima Air Conditioning and Refrigeration Limited | Construction | 1983 |
| Prime.Ax Limited | Professional & scientific | 2026 |
| Primo Electrical Installations Ltd | Construction | 2019 |
| Prince's Mead School Trust | Education | 1984 |
| Print Technologies Limited | Wholesale & retail | 2005 |
| Printing Crazy Ltd | Manufacturing | 2005 |
| Printsafe Limited | Wholesale & retail | 2006 |
| Pro Alliance Promotions Ltd | Arts & recreation | 2007 |
| Pro Interiors Limited | Administrative & support | 2005 |
| Pro Portraits International Ltd. | Professional & scientific | 2002 |
| Proclean Cleaning Services Limited | Administrative & support | 1987 |
| Prodamina Limited | Professional & scientific | 2003 |
| Professional Entry Locksmiths Limited | Administrative & support | 2006 |
| Profitline Consultancy Ltd | Professional & scientific | 1996 |
| Prographics Limited | Professional & scientific | 2000 |
| Project Specific Tasks Limited | Construction | 2007 |
| Prolix Limited | Professional & scientific | 2004 |
| Promentor Professional Services Limited | Professional & scientific | 2005 |
| Prompt On-Line Management Limited | Administrative & support | 1997 |
| Property Cleaning Services Limited | Administrative & support | 2004 |
| Proplas Fibreglass Roofing Limited | Construction | 2016 |
| Prospect Fencing Limited | Manufacturing | 2002 |