| PH London Limited | Professional & scientific | 2013 |
| Phaded London Limited | Information & communication | 2020 |
| Pharma Aesthetics Clinic Ltd | Health & social care | 2025 |
| Pharmacare Experts Limited | Health & social care | 2025 |
| Pharmaserv Limited | Other services | 2022 |
| PHD Access Ltd | Construction | 2012 |
| PHD Access Properties Limited | Real estate | 2012 |
| PHD Group Services Limited | Arts & recreation | 2014 |
| PHD Hoists & Masts Limited | Construction | 2015 |
| PHD IP & Systems Limited | Extraterritorial | 2019 |
| PHD Modular Access Services Limited | Construction | 1992 |
| PHD Racing Limited | Arts & recreation | 2020 |
| PHD Special Projects Ltd | Extraterritorial | 2015 |
| Phelps Driving Ltd | Transport & logistics | 2019 |
| Phenomenal Engineers Limited | Construction | 2019 |
| Philips Investments Ltd | Real estate | 2024 |
| PHO & Grill Co. Ltd | Hospitality | 2026 |
| Phoenix Analytics Ltd | Professional & scientific | 2019 |
| Phoenix Dyslexia Consulting Ltd | Education | 2018 |
| Phoenix Motorz Ltd | Wholesale & retail | 2024 |
| Photo Plus Ltd | Professional & scientific | 2021 |
| Photosavvy Ltd | Arts & recreation | 2026 |
| PHP Properties Limited | Real estate | 2023 |
| Phukraj Realty Ltd | Real estate | 2025 |
| Physio Matrix Ltd | Health & social care | 2025 |
| Physiomist Ltd | Information & communication | 2026 |
| PIA Industries Ltd | Extraterritorial | 2020 |
| PIC Photos Limited | Professional & scientific | 1959 |
| Pica Computing Services Limited | Professional & scientific | 1975 |
| Pick N Move Logistics Limited | Transport & logistics | 2025 |
| Pieldheath Convenience Store Ltd | Wholesale & retail | 2020 |
| Piknd Property Management Company Ltd | Real estate | 2025 |
| Pilgrim's Europe Ltd | Extraterritorial | 1989 |
| Pilgrim's Food Masters UK Limited | Manufacturing | 2021 |
| Pilgrim's Pride Ltd. | Manufacturing | 1958 |
| Pilgrim's Shared Services Ltd | Administrative & support | 2022 |
| Pilgrim's UK Lamb Ltd. | Wholesale & retail | 1971 |
| Pillaiyar Onriyam Ltd | Health & social care | 2019 |
| Pillows Property Ltd | Real estate | 2023 |
| Pillowtex Ltd | Wholesale & retail | 2002 |
| Pilot Hospitality Limited | Real estate | 2024 |
| Pinchester Properties LLP | | 2018 |
| Pinda Investments Ltd | Financial services | 2025 |
| Pinda Ltd | Financial services | 2024 |
| Pine Valley Limited | Information & communication | 2022 |
| Pineapple Repairs Limited | Wholesale & retail | 2020 |
| Pinewood Avenue Ltd | Real estate | 2026 |
| Pinewood Paving Limited | Construction | 2017 |
| Pink and White Nails (Swakeley) Ltd | Other services | 2022 |
| Pinki LDN Ltd | Wholesale & retail | 2022 |
| Pinnacle Aviation Services Ltd | Transport & logistics | 2024 |
| Pinnacle Financial Consultants Limited | Professional & scientific | 2024 |
| Pinnacle Healthcare Limited | Health & social care | 2025 |
| Pinnacle HR Services Ltd | Administrative & support | 2023 |
| Pinnacle Supported Living Limited | Extraterritorial | 1992 |
| Pinnstream Ltd | Information & communication | 2015 |
| Pinsane Events Limited | Administrative & support | 2022 |
| Pintiliescu Properties Ltd | Real estate | 2025 |
| Pintiliescu Services Limited | Other services | 2020 |
| Pintria Ltd | Professional & scientific | 2025 |
| Pioneer Security Limited | Administrative & support | 2004 |
| Pioneering Solutions Ltd | Professional & scientific | 2021 |
| Pixelnebula Limited | Information & communication | 2013 |
| Pizza Delite Limited | Hospitality | 2016 |
| Pizza Point Ryefield Ltd | Hospitality | 2024 |
| Pizzaexpress (Franchises) Limited | Hospitality | 1993 |
| Pizzaexpress (Restaurants) Limited | Hospitality | 1993 |
| Pizzaexpress (Wholesale) Limited | Hospitality | 1993 |
| Pizzaexpress Financing 2 PLC | Professional & scientific | 2014 |
| Pizzaexpress Group Limited | Professional & scientific | 2014 |
| Pizzaexpress International Holdings Limited | Financial services | 2015 |
| Pizzaexpress Limited | Hospitality | 1978 |
| Pizzaexpress Merchandising Limited | Hospitality | 1996 |
| Pizzaexpress Newco Limited | Professional & scientific | 2023 |
| Pizzaexpress Operations Limited | Professional & scientific | 2003 |
| Pizzaexpress UAE Holdings Limited | Financial services | 2015 |
| Pizzaexpress US Limited | Hospitality | 2024 |
| PJB Prop Services Limited | Construction | 2014 |
| PJL Investments Limited | Professional & scientific | 2022 |
| PJM Lighting Ltd | Arts & recreation | 2015 |
| PJM Residential Ltd | Real estate | 2025 |
| Pjsr Investments Ltd | Real estate | 2024 |
| PK Insyte Consulting Ltd | Professional & scientific | 2024 |
| PL Trading Ltd | Construction | 2006 |
| Planet Motors London Ltd | Wholesale & retail | 2023 |
| Planpath (UK) Limited | Construction | 2014 |
| Plansdesigned Ltd | Construction | 2026 |
| Plant & Specialist Services Ltd | Professional & scientific | 2024 |
| Plant and Garage Equipment Engineering Company Limited | Manufacturing | 1988 |
| Planting Seeds Consulting Ltd | Professional & scientific | 2020 |
| Platform Repairs Limited | Construction | 2011 |
| Platignum Limited | Manufacturing | 2004 |
| Platinum Digital Print Solutions Limited | Information & communication | 2015 |
| Platinum Energy Consultancy Ltd | Manufacturing | 2021 |
| Platinum Hospitality Limited | Professional & scientific | 2010 |
| Platinum Point Estate Limited | Real estate | 2020 |
| Plcs Consultancy Limited | Professional & scientific | 2024 |
| Pleese Group Limited | Manufacturing | 2018 |
| Pleese Ltd | Manufacturing | 2025 |
| Pleesecakes Media Ltd | Administrative & support | 2017 |