| Perisan Ltd | Other services | 2017 |
| Perks Recovery Services Ltd | Wholesale & retail | 2025 |
| Perky Clothing Limited | Wholesale & retail | 2012 |
| Perroj Developments Ltd | Real estate | 2025 |
| Perry House Consultancy Ltd | Professional & scientific | 2017 |
| Personalized Medicines 4 U Limited | Professional & scientific | 2007 |
| Pestguard Solutions Ltd | Administrative & support | 2025 |
| Peter Hawkins Painting & Decorating Limited | Construction | 2025 |
| Peter Hutchin Joinery Ltd | Manufacturing | 2015 |
| Petna Trading Ltd | Wholesale & retail | 2024 |
| Petraeus Medical Services Ltd | Health & social care | 2021 |
| Petrobex Ltd | Professional & scientific | 2014 |
| Petrok OIL & GAS Limited | Wholesale & retail | 2017 |
| PFD Estates Ltd | Real estate | 2018 |
| PG Compliance Services Limited | Information & communication | 2017 |
| PG Olley Limited | Real estate | 2026 |
| Phantom Care Ltd | Wholesale & retail | 2023 |
| Pharma Better Ltd | Health & social care | 2020 |
| Pharmaceutech Ltd | Professional & scientific | 2023 |
| Pharmalive Limited | Health & social care | 2019 |
| Pharmflex Ltd | Wholesale & retail | 2023 |
| Pharmilton Ltd. | Other services | 2016 |
| Phat Pitch Ltd | Administrative & support | 2019 |
| Pheonix Controls Limited | Professional & scientific | 2022 |
| Phikfad Limited | Health & social care | 2023 |
| Philharmonic Rise Management Company Limited | Households | 2014 |
| Philip Coverdale Limited | Professional & scientific | 2000 |
| Philom Properties Limited | Real estate | 2024 |
| Phils Health Limited | Health & social care | 2023 |
| Phoenix (Borehamwood) Management Company Limited | Households | 2003 |
| Phoenix Athena Ltd | Other services | 2019 |
| Phoenix Incorp Ltd | Construction | 2018 |
| Phoenix Integrated Services Ltd | Manufacturing | 2026 |
| Phoenix Prime Consulting Ltd | Professional & scientific | 2022 |
| Phoenix Rizing Limited | Other services | 2026 |
| Phone World Essex Ltd | Other services | 2024 |
| Phone World Harlow Ltd | Wholesale & retail | 2022 |
| Phro Ltd | Administrative & support | 2021 |
| Phytovita Limited | Manufacturing | 2020 |
| Pi-Health Limited | Information & communication | 2020 |
| Pickle Marketing Ltd | Professional & scientific | 2025 |
| Pickleball UK Tournaments Limited | Education | 2025 |
| Picknfix Limited | Administrative & support | 2021 |
| Pield Heath Road Management Limited | Real estate | 2017 |
| Pieni Vauva Limited | Professional & scientific | 2007 |
| PIF Services Limited | Construction | 2025 |
| Pigface Limited | Wholesale & retail | 2024 |
| Piglettings Ltd | Real estate | 2019 |
| Pikes Plumbing & Heating Ltd | Construction | 2015 |
| Pimlico Landscaping & Building Ltd | Construction | 2025 |
| Pinestone Capital Limited | Financial services | 2026 |
| Pink Orchid Limited | Other services | 2019 |
| Pink Spice Limited | Hospitality | 2025 |
| Pinkys Blox Ltd | Wholesale & retail | 2022 |
| Pinnacle International Ltd | Hospitality | 2021 |
| Pinnacle Partition Systems Limited | Construction | 2008 |
| Pinnacle Workforce Limited | Financial services | 2026 |
| Pinnaclehorizon Limited | Health & social care | 2024 |
| Pinnacles 4 Management Limited | Households | 1988 |
| Pinnacles Car Wash Ltd | Wholesale & retail | 2024 |
| Pinpoint Solutions Contracting Limited | Administrative & support | 2017 |
| Pinpoint Solutions Limited | Professional & scientific | 2002 |
| Pinto Estates UK Ltd | Real estate | 2024 |
| Pirouz Ltd | Energy | 2023 |
| Pitchway (5-10) Newhall RTM Company Limited | Households | 2026 |
| Pivot Homes Limited | Real estate | 2024 |
| Piwuji Limited | Health & social care | 2023 |
| Pixeldrive Ltd | Wholesale & retail | 2025 |
| Pixie Magic Play Zones Ltd | Health & social care | 2022 |
| Pizzamatik Ltd | Hospitality | 2023 |
| PJ Mortgage Solutions Limited | Financial services | 2020 |
| PJB Pharma Ltd | Professional & scientific | 2024 |
| PJD Productions Ltd | Arts & recreation | 2022 |
| PK Design Limited | Professional & scientific | 2023 |
| PKH Properties Limited | Financial services | 2011 |
| Plant Love Organic Ltd | Wholesale & retail | 2017 |
| Plant Pots and Wellies Community Interest Company | Health & social care | 2018 |
| Plants Galore Holdings Limited | Financial services | 2024 |
| Plants Galore Limited | Wholesale & retail | 2024 |
| Platinum Facades Limited | Construction | 2019 |
| Platinum Harbor CIC | Real estate | 2022 |
| Platinum Mayfair Limited | Professional & scientific | 2016 |
| Platinum Partners ANR Limited | Real estate | 2025 |
| Platinum Stars Ltd | Wholesale & retail | 2018 |
| Platinumsunshine Ltd | Education | 2024 |
| Platters & Palettes Ltd | Hospitality | 2026 |
| Playback Productions Ltd | Information & communication | 2018 |
| Playerscanner Ltd | Information & communication | 2024 |
| Pleasant Valley Management Company Ltd | Real estate | 2024 |
| Pleash Ltd | Wholesale & retail | 2023 |
| Plena Dimension Limited | Health & social care | 2021 |
| PLG Ltd | Extraterritorial | 2019 |
| PLT Group Properties Ltd | Real estate | 2026 |
| PLUG-IN2 Electrical Services Ltd | Construction | 2014 |
| Plumb in London Limited | Construction | 2019 |
| Plumbing-Heating-Building Ltd | Construction | 2012 |
| Plurala Limited | Information & communication | 2020 |
| PMA Harlow Limited | Arts & recreation | 2024 |
| Pmau Limited | Professional & scientific | 2012 |
| PMJ International Group Ltd | Professional & scientific | 2023 |