| Pembridge Court Management Limited | Households | 1987 |
| Pembridge Park (Phase 2) Management Company Limited | Real estate | 2017 |
| Pembroke Gate Management Company Limited | Households | 2000 |
| Pembroke Homes Management Company Limited | Households | 2001 |
| Pembroke Lodge Residents RTM Company Ltd | Households | 2018 |
| Pembroke Park (Cirencester) Management Company Limited | Households | 2016 |
| Pembroke Road (Sevenoaks) Management Limited | Households | 2011 |
| PEN Pentre (Sychydn) Management Company Limited | Households | 2018 |
| PEN Y Bryn Holdings Limited | Financial services | 2016 |
| Penarth Heights (Penarth) Management Company Limited | Households | 2013 |
| Pencrest Investments Limited | Real estate | 2003 |
| Pendulum Works Ltd | Information & communication | 2018 |
| Penelope Luciano Ltd | Other services | 2025 |
| Penfold Close Residents Company Limited | Households | 1986 |
| Peng Creation Limited | Wholesale & retail | 2020 |
| Penge House Ltd | Real estate | 2022 |
| Penge House Management Ltd | Real estate | 2022 |
| Pengediy Ltd | Wholesale & retail | 2020 |
| Penguin Quality Engineering Limited | Information & communication | 2025 |
| Peniuc Services Ltd | Construction | 2026 |
| Penivijo Ltd | Real estate | 2025 |
| Penlands Green Management Company Limited | Households | 2017 |
| Penn Stores Limited | Wholesale & retail | 2006 |
| Penniel Services Limited | Hospitality | 2025 |
| Penny 2014 LLP | | 2014 |
| Penny Investments 2014 Ltd | Professional & scientific | 2014 |
| Penny's House Publishing Ltd | Wholesale & retail | 2021 |
| Penny-Woods Construction Ltd | Construction | 2026 |
| Penrose House (Plots 62-70) Management Company Limited | Households | 2013 |
| Pension Playpen Limited | Administrative & support | 2013 |
| Pensy Limited | Wholesale & retail | 2025 |
| Penta Property Limited | Real estate | 2019 |
| Penuel Group Ltd | Information & communication | 2003 |
| Penzy’S Enterprise Limited | Wholesale & retail | 2024 |
| People 1ST Consulting Services Limited | Professional & scientific | 2014 |
| People in Care Ltd | Health & social care | 2003 |
| Peppa Property Services Limited | Real estate | 2024 |
| Perdu Investments Ltd | Real estate | 2022 |
| Pereira's Building Contractors Ltd | Construction | 2022 |
| Perennial Cyber Solutions Limited | Information & communication | 2023 |
| Pereshaw (Isleworth) Management Limited | Households | 2002 |
| Perfect Finish Services Ltd | Health & social care | 2024 |
| Perfect Harmony Productions Ltd | Arts & recreation | 2010 |
| Perfect Mayhem Ltd | Information & communication | 2021 |
| Perfect Quality Care Ltd. | Health & social care | 2014 |
| Perfection Care Ltd | Health & social care | 2019 |
| Perfectly Imperfect Prints Ltd | Information & communication | 2022 |
| Perfectly Possible Designs Limited | Professional & scientific | 2015 |
| Perfecto Catering Ltd | Hospitality | 2025 |
| Performance for Growth Ltd | Administrative & support | 2007 |
| Performance Heating & Plumbing Ltd. | Other services | 2011 |
| Perfume Source Limited | Wholesale & retail | 2013 |
| Peri Peri Chicken Bites Croydon Ltd | Hospitality | 2023 |
| Peri Peri Grill OUT Ltd | Hospitality | 2026 |
| Peri Pizza Ltd | Hospitality | 2022 |
| Peripatetic Consulting Ltd | Professional & scientific | 2019 |
| Perkins Group Services Limited | Wholesale & retail | 1956 |
| Perola Group Ltd | Financial services | 2025 |
| Perola Properties Ltd | Real estate | 2025 |
| Perq Studio Ltd. | Professional & scientific | 2017 |
| Perrin Jones Electrical Ltd | Professional & scientific | 2015 |
| Perrydon Limited | Wholesale & retail | 2025 |
| Personal Passenger Travel Ltd | Transport & logistics | 2019 |
| Personal Shipping Services Limited | Transport & logistics | 2012 |
| Perusinghe Properties Limited | Real estate | 2025 |
| Perwest Limited | Households | 1982 |
| Pesala Consulting Ltd | Professional & scientific | 2022 |
| Pest Revenge Ltd | Administrative & support | 2019 |
| Pet Focus Limited | Wholesale & retail | 2024 |
| Pet Lovers Hotel & Spar Ltd | Other services | 2025 |
| Pet Proinsight Limited | Professional & scientific | 2025 |
| Peter Harrison, Mark Goldman Design Consultants Limited | Professional & scientific | 1993 |
| Peter Holman Associates Limited | Professional & scientific | 2010 |
| Peter KOO Design Ltd | Arts & recreation | 2016 |
| Petersbourne Court Management Co. Limited | Households | 1974 |
| Petit - Marzac Limited | Real estate | 1990 |
| Petras Health Services Ltd | Health & social care | 2009 |
| Petrini Projects Ltd | Professional & scientific | 2018 |
| Petrisor Construction Ltd | Construction | 2025 |
| Petrocell Holdings Limited | Wholesale & retail | 1974 |
| Petrocell SS Limited | Wholesale & retail | 2018 |
| Petrosize Flat Management Company Limited | Households | 1978 |
| Petrotrans Limited | Professional & scientific | 2013 |
| Petru Fixing Ltd | Construction | 2025 |
| Petrus Real Estate Ltd | Real estate | 2023 |
| Petter LX Limited | Arts & recreation | 2011 |
| Petts Wood Fleet Services Ltd | Administrative & support | 2018 |
| Pewterhooter Design Limited | Manufacturing | 2014 |
| Pewterhooter Limited | Manufacturing | 2012 |
| Pewterhooter London Limited | Manufacturing | 2016 |
| PF Whitehead Transport Services Limited | Transport & logistics | 1970 |
| PGG Properties Limited | Construction | 2014 |
| PGJ Supreme Builders Ltd | Construction | 2025 |
| Pgws Business Group Limited | Administrative & support | 2019 |
| PH Graphic Design Limited | Professional & scientific | 2015 |
| Phambra (700) Ltd | Wholesale & retail | 2012 |
| Phantom Secret Doors Ltd | Manufacturing | 2021 |
| Pharm D Limited | Wholesale & retail | 2016 |
| Pharm-Ent Limited | Administrative & support | 2006 |
| Pharma Test Limited | Wholesale & retail | 2001 |