| Perry Insurance Consultants Limited | Financial services | 1997 |
| Perry Ryan Construction Limited | Construction | 2008 |
| Perrys (Herts) LLP | | 2012 |
| Personal Assistant Care Agency Limited | Health & social care | 2016 |
| Pertempo Limited | Real estate | 2020 |
| Pestforce Bath, Swindon & Wiltshire Ltd | Agriculture & fishing | 2023 |
| Pete Morgan Engineering Ltd | Professional & scientific | 2023 |
| Peter Curran Ltd | Information & communication | 2023 |
| Peter Welsh Consultancy Limited | Professional & scientific | 2024 |
| Petitt Brothers Contracting Ltd | Construction | 1994 |
| Petrichor Consultants Ltd | Information & communication | 2025 |
| Petroliana Limited | Wholesale & retail | 2018 |
| Pewsham Pre-School Limited | Education | 2006 |
| PF Baker & Sons Ltd | Construction | 2024 |
| PF Baker Limited | Construction | 2007 |
| PG Native Ltd | Professional & scientific | 2022 |
| PGL Learning and Development Limited | Administrative & support | 2013 |
| PH Real Estate Limited | Real estate | 2021 |
| Pharmaceutical Physicians Ltd | Health & social care | 2011 |
| Pharmcare Services Limited | Health & social care | 2021 |
| Philanthropy Centre Ltd | Professional & scientific | 2025 |
| Philip Cheeseman and Sons Plumbing and Heating Ltd | Construction | 2016 |
| Phillips Hospitality Consultant Ltd | Professional & scientific | 2020 |
| Philnic Holdings Ltd | Financial services | 2011 |
| Phoenix MED Ltd | Administrative & support | 2016 |
| Phoenix Close Management Limited | Households | 2004 |
| Phoenix Commercial Management Ltd | Professional & scientific | 2019 |
| Phoria Music Ltd | Information & communication | 2013 |
| Pick and MIX Music (UK) Ltd | Information & communication | 2012 |
| Pick and MIX Music Publishing Ltd | Information & communication | 2021 |
| Pikapulls Ltd | Wholesale & retail | 2025 |
| Pillow MAY Ltd | Professional & scientific | 2009 |
| Pine Tree Commercial Ltd | Real estate | 2026 |
| Pine Tree Property Investments Limited | Real estate | 2018 |
| Pine Tree SA Ltd | Real estate | 2022 |
| Pine Tree Sports Investments Ltd | Financial services | 2019 |
| Pinkworthy Bess Limited | Energy | 2024 |
| Pinnacle Woodworking & Design Ltd | Manufacturing | 2024 |
| Pinsohurst Properties Limited | Administrative & support | 1977 |
| Pipe-Dream (UK) Limited | Construction | 2004 |
| Pitch on Pixel Ltd | Information & communication | 2025 |
| Pitt House Holidays Limited | Hospitality | 2022 |
| PIV UK (National) Ltd | Other services | 2022 |
| Pivot POD Works Ltd | Health & social care | 2023 |
| Pixel & DOT Limited | Professional & scientific | 2014 |
| Pixel Basement Limited | Information & communication | 2020 |
| Pixel Place Retail Ltd | Wholesale & retail | 2023 |
| Pixel Pro Design Ltd | Professional & scientific | 2023 |
| Pizza Folk Limited | Hospitality | 2018 |
| Pizzas Direct (Calne) Limited | Hospitality | 2024 |
| Pjacapital Limited | Professional & scientific | 2013 |
| Pjcsonline.Co.Uk Ltd | Education | 2008 |
| PJH Mortgage Solutions Limited | Financial services | 2018 |
| PJK Enclosures Ltd | Construction | 2024 |
| Plan a Surveys Limited | Professional & scientific | 2025 |
| Planet Once Holding Limited | Information & communication | 2023 |
| Planning Genie Limited | Professional & scientific | 2022 |
| Plants at Home Ltd | Wholesale & retail | 2021 |
| Plasdec Limited | Construction | 2015 |
| Playhouse Southampton Limited | Extraterritorial | 2020 |
| Plexsys Limited | Information & communication | 2001 |
| PLF Farming Limited | Agriculture & fishing | 2023 |
| PLF Hospitality Limited | Hospitality | 2021 |
| Plkm Productions Ltd | Information & communication | 2022 |
| Plot 21 Properties Ltd | Real estate | 2023 |
| Plugware Solutions.Com Limited | Information & communication | 2001 |
| Plumb Rite-Gas Tite Limited | Construction | 2014 |
| Plume Motor Holdings Limited | Professional & scientific | 2011 |
| Plumtrak Limited | Financial services | 1996 |
| Plus Four Four Automotive Limited | Wholesale & retail | 2020 |
| PLUS2LIFE Limited | Other services | 2012 |
| PMC Interiors Limited | Real estate | 2010 |
| Pmiq Limited | Education | 2010 |
| Pocket Sports Limited | Wholesale & retail | 2021 |
| Podmore Developments Ltd | Construction | 2026 |
| Pointerlane Limited | Hospitality | 2006 |
| Polit Transport Ltd | Transport & logistics | 2022 |
| Pool Build Ltd | Manufacturing | 1995 |
| Pool Design Limited | Construction | 1995 |
| Pool School Limited | Manufacturing | 1990 |
| Pool Servicing (Home Counties) Limited | Administrative & support | 2000 |
| Poppet Interiors Limited | Arts & recreation | 2014 |
| Poros Consulting Ltd | Professional & scientific | 2020 |
| Porte Properties Limited | Real estate | 2022 |
| Porter Robinson Interiors Ltd | Other services | 2008 |
| Portform Limited | Professional & scientific | 1973 |
| Portform Three Limited | Professional & scientific | 1973 |
| Portform Two Limited | Professional & scientific | 1983 |
| Porth and Vale Ltd | Professional & scientific | 2024 |
| Portobello Partners Limited | Professional & scientific | 2025 |
| Post Graduate Open Learning Ltd | Education | 2011 |
| Potter and Paint Limited | Professional & scientific | 2003 |
| Powered UP Access Limited | Administrative & support | 2009 |
| Powerfactor (U.K.) Limited | Manufacturing | 1996 |
| Powertrax Limited | Professional & scientific | 2013 |
| PPH Palmer Plumbing & Heating Ltd | Construction | 2019 |
| PPS Heating & Plumbing Ltd | Construction | 2011 |
| Prades Wall Tile and Floor Coverings Ltd | Construction | 2016 |
| Prairie Rose Bars Ltd | Hospitality | 2017 |
| Prangle & Wren Construction Ltd | Construction | 2018 |