| Pebbles Cars Limited | Transport & logistics | 2022 |
| Peel House Morden Limited | Real estate | 2025 |
| Peer Software UK Limited | Information & communication | 2017 |
| Peer-Southern Productions Limited | Information & communication | 1967 |
| Peermusic Accorder Library Limited | Information & communication | 2022 |
| Pelhamstar Limited | Real estate | 1983 |
| Pemberton Stewart UK Limited | Administrative & support | 2010 |
| Pembroke Gate Residents Association Limited | Households | 1997 |
| Penn Park Capital Management Limited | Professional & scientific | 2011 |
| Pennine Referrals Ltd | Professional & scientific | 2023 |
| Penri Consulting Ltd | Professional & scientific | 2026 |
| Penrosa Limited | Households | 1991 |
| Pensford Consultancy Services Ltd | Professional & scientific | 2023 |
| Pension Capital Investments Ltd | Professional & scientific | 2025 |
| Pensive Penguin Productions Limited | Information & communication | 2025 |
| Pentax Ltd | Professional & scientific | 2025 |
| Penton Properties Limited | Real estate | 2018 |
| Penwinet Associates Limited | Information & communication | 2010 |
| Peony Investments Limited | Real estate | 2022 |
| Peoplecheck Holdings Limited | Financial services | 2022 |
| Peoplecheck Limited | Administrative & support | 2003 |
| Peppercorn Properties Limited | Real estate | 2013 |
| Pepperusso Pictures Ltd | Information & communication | 2021 |
| Perchem Limited | Wholesale & retail | 2023 |
| Peret Holdings Limited | Financial services | 2024 |
| Perez C Limited | Wholesale & retail | 2026 |
| Perfect Place Supplies Ltd | Wholesale & retail | 2015 |
| Perfect Smile Bracknell Limited | Health & social care | 2011 |
| Perfect Smile Cosham Ltd | Health & social care | 2016 |
| Perfect Smile Falcon Road Limited | Health & social care | 2013 |
| Perfect Smile Group Holding 2 Limited | Health & social care | 2016 |
| Perfect Smile Group Holding Limited | Health & social care | 2014 |
| Perfect Smile Healthcare Limited | Health & social care | 2011 |
| Perfect Smile Healthcare Property Limited | Real estate | 2011 |
| Perfect Smile Hoseside Limited | Health & social care | 2017 |
| Perfect Smile Maple House Limited | Health & social care | 2016 |
| Perfect Smile Property Limited | Real estate | 2018 |
| Perfect Smile Reading Limited | Health & social care | 2018 |
| Perfect Smile Surgery Limited | Health & social care | 2007 |
| Perfect Smile Tyldesley Limited | Health & social care | 2019 |
| Perfect Suits UK Limited | Manufacturing | 2008 |
| Perfectly Legal LLP | | 2011 |
| Perfectly Limited | Extraterritorial | 2011 |
| Performance FG Limited | Administrative & support | 2006 |
| Performance House Limited | Other services | 2023 |
| Peri Peri Kitchen Limited | Hospitality | 2017 |
| Petal & Pastry Ltd | Manufacturing | 2025 |
| Petcare (Richmond) Limited | Other services | 2016 |
| Peter Hall Limited | Professional & scientific | 2009 |
| Peter Lole & Co (MTU) Limited | Professional & scientific | 1990 |
| Peter Lole & Co. Limited | Financial services | 1979 |
| Peter LOY Limited | Professional & scientific | 2011 |
| Peters Property Maintenance Limited | Construction | 2016 |
| Petersham Capital Limited | Real estate | 2020 |
| Petersham Cellar Limited | Wholesale & retail | 2013 |
| Petersham Garden Design Ltd | Professional & scientific | 2025 |
| Petersham Nurseries Limited | Wholesale & retail | 1962 |
| Petersham Playhouse Limited | Arts & recreation | 2012 |
| Pets Home Ltd | Wholesale & retail | 2020 |
| Pets Yoga Ltd | Arts & recreation | 2018 |
| Phantom Protolabs Ltd | Professional & scientific | 2025 |
| Pharmask Limited | Professional & scientific | 2014 |
| Pharmatech Consulting Limited | Information & communication | 2023 |
| PHF Nutrition Consultancy Ltd | Arts & recreation | 2025 |
| Philbloke Ltd | Arts & recreation | 2015 |
| Philip Hunt Associates Limited | Real estate | 2010 |
| Philippe Hurel (UK) Limited | Wholesale & retail | 2003 |
| Phillips Tracey Architects Ltd | Professional & scientific | 2002 |
| Phinda Publishing Ltd | Information & communication | 2015 |
| Phoenix Chinese News & Entertainment Limited | Information & communication | 1990 |
| Phoenix Electrical Management Limited | Construction | 2016 |
| Phoenix Fencing Supplies Limited | Administrative & support | 2007 |
| Phoenix Refrigeration & Catering Limited | Manufacturing | 2011 |
| Phones for Africa CIC | Health & social care | 2023 |
| Photonic Power Ltd | Professional & scientific | 2018 |
| Phygital Property Ltd | Real estate | 2026 |
| PHYSIO42 Limited | Other services | 2024 |
| Physiotherapy in Chelsea Ltd | Health & social care | 2019 |
| Picasso Assets Ltd | Other services | 2017 |
| Picksell Trade Ltd | Wholesale & retail | 2023 |
| Piecehead Limited | Hospitality | 2022 |
| Pier 40 Consulting Limited | Professional & scientific | 2017 |
| Piffard Holdings Limited | Construction | 2021 |
| Pigeon Labs Ltd | Information & communication | 2026 |
| Pilmar International Limited | Transport & logistics | 1990 |
| Pingin Communications Limited | Information & communication | 2018 |
| Pinhey Associates Limited | Professional & scientific | 2011 |
| Pink GUN Records Limited | Manufacturing | 1996 |
| Pink Stretch Boutique Ltd | Health & social care | 2019 |
| Pinnacle Contracts 2012 Limited | Extraterritorial | 2012 |
| Pinnacle Ductwork Manufacturers Limited | Manufacturing | 1992 |
| Pinnacle Horizons Tech Ltd | Administrative & support | 2025 |
| Pinnacle Land Limited | Construction | 2023 |
| Pinnacle Recruitment Ltd | Administrative & support | 2007 |
| Pinnter Ltd | Other services | 2017 |
| Pinthong Ltd | Hospitality | 2024 |
| Piste Mapper Limited | Information & communication | 2023 |
| Pivot Cloud Ltd | Professional & scientific | 2023 |
| Pizza Pronto North Yorkshire Ltd | Hospitality | 2020 |
| Pizzeria Portofino Ltd. | Hospitality | 2013 |