| Pengcheng Housekeeping Service Company Ltd | Transport & logistics | 2023 |
| Penha-Longa Ltd | Administrative & support | 2021 |
| Penlake Trading Limited | Professional & scientific | 2004 |
| Penny Moraira Limited | Real estate | 2017 |
| Penrhyn Consulting Ltd | Professional & scientific | 2025 |
| Penrice & Hales Developments (2024) Limited | Real estate | 2024 |
| Penrice & Hales Developments Limited | Real estate | 2018 |
| Penshurst Insurance Services Ltd | Financial services | 2020 |
| Pentagon Training Limited | Administrative & support | 1995 |
| Pentire Edge Ltd | Professional & scientific | 2026 |
| Penultimate Ventures Limited | Information & communication | 2025 |
| People to Places | Transport & logistics | 2002 |
| Perfect Chauffeur Ltd | Transport & logistics | 2023 |
| Perfection Pest Control Limited | Administrative & support | 2020 |
| Periscope Learning Limited | Education | 2024 |
| Perk Mobile Coffee Ltd | Hospitality | 2021 |
| Perkaar Ltd | Wholesale & retail | 2021 |
| Perma Contracts Fencing Ltd | Construction | 2020 |
| Permans PVT Ltd | Health & social care | 2022 |
| Peronen Limited | Professional & scientific | 2016 |
| Perpetual Law Limited | Professional & scientific | 2025 |
| Perphect Ltd | Wholesale & retail | 2024 |
| Perquin Ltd | Real estate | 2021 |
| Personal Chauffeur Service Ltd | Transport & logistics | 2025 |
| Pet Detective Properties Ltd | Real estate | 2021 |
| Peta BEE Communications Limited | Information & communication | 2011 |
| Peter Adamson Group Ltd | Information & communication | 2026 |
| Peter Osborne Fine Wines Ltd | Wholesale & retail | 2003 |
| Peter Upton Limited | Professional & scientific | 1999 |
| Peyami Trading Co Limited | Information & communication | 2022 |
| Pezgordo Technologies Ltd | Information & communication | 2022 |
| Pform Ltd | Hospitality | 2025 |
| Pformance Limited | Professional & scientific | 2015 |
| PG Services (UK) Limited | Professional & scientific | 2011 |
| PGD Food Services Limited | Wholesale & retail | 2018 |
| PGD Foods Limited | Wholesale & retail | 2018 |
| PH Systems Design Limited | Professional & scientific | 2016 |
| Phamwayz Ltd | Public administration | 2016 |
| Phantom Cars Limited | Administrative & support | 2022 |
| Pharma Legal and Integrity Consulting Limited | Professional & scientific | 2016 |
| Pharmaempire Consulting Ltd | Professional & scientific | 2015 |
| Pharmco Consultancy Ltd | Professional & scientific | 2007 |
| Pharmcon Ltd | Administrative & support | 2023 |
| Phase I-Iv Limited | Professional & scientific | 2011 |
| Phelps Consultancy Ltd | Information & communication | 2012 |
| Phil Draper Consulting Ltd | Professional & scientific | 2025 |
| Philip Rees Associates Ltd | Administrative & support | 2024 |
| Phixing Plumbing and Hvac Solutions Limited | Construction | 2020 |
| Phoenix Clinics Holdings Limited | Health & social care | 2025 |
| Phototed-It Ltd | Wholesale & retail | 2018 |
| PHV Rentals Limited | Administrative & support | 2016 |
| Physiofitness Ltd | Health & social care | 2007 |
| Physiological Systems UK Ltd | Professional & scientific | 2014 |
| Piano Manufacturing Limited | Manufacturing | 2024 |
| PIC IHC LLP | | 2022 |
| Pickering Planning and Legal Services Limited | Professional & scientific | 2024 |
| Pickle Consulting Ltd | Professional & scientific | 2015 |
| Pictorial Press Limited | Information & communication | 1938 |
| Picture This Art and Framing Limited | Professional & scientific | 2010 |
| Pied Crow Consulting LLP | | 2017 |
| Pike Performance Ltd | Health & social care | 2021 |
| Pilime Health Care Ltd | Health & social care | 2016 |
| Pimco 2945 Limited | Professional & scientific | 1917 |
| PIN & Parcel Ltd | Wholesale & retail | 2026 |
| PIN High Golf Ltd | Arts & recreation | 2026 |
| Pinch Insight and Strategy Ltd | Professional & scientific | 2025 |
| Pinden Plant & Processing Co. Limited(The) | Professional & scientific | 1981 |
| Pineapple Property Solutions Ltd | Construction | 2021 |
| Pingg Limited | Information & communication | 2020 |
| Pingpong UX Limited | Professional & scientific | 2017 |
| Pink & Perfect Florists Ltd | Wholesale & retail | 2018 |
| Pink Potential Ltd | Construction | 2023 |
| Pink Rose Biotech Ltd | Wholesale & retail | 2023 |
| Pinkneys Green Residence Maintenance Limited | Construction | 2024 |
| Pinkneys Motors Ltd | Wholesale & retail | 2024 |
| Pinkneysgreenresidence Limited | Construction | 2018 |
| Pinky's Kitchen Ltd | Hospitality | 2022 |
| Pinnacle Homes (Berkshire) Limited | Real estate | 2017 |
| Pinnacle Property and Estates Ltd | Construction | 2024 |
| Pinnacle Property and Lettings Services Ltd | Construction | 2021 |
| Pinnacle Property Developments Ltd | Construction | 2019 |
| Pinnacle Support Services Ltd | Construction | 2020 |
| Pinto Investments Ltd | Wholesale & retail | 2019 |
| Pioneer Aggregates(Uk)Limited | Professional & scientific | 1960 |
| Pioneer Asphalts (U.K.) Limited | Professional & scientific | 1978 |
| Pioneer Concrete Holdings Limited | Financial services | 1962 |
| Pioneer Concrete(U.K.)Limited | Professional & scientific | 1941 |
| Pioneer Financial Planning Limited | Financial services | 2022 |
| Pioneer Group International Ltd | Information & communication | 2024 |
| Pioneer International Group Holdings Limited | Professional & scientific | 1994 |
| Pioneer Investments UK Limited | Professional & scientific | 1990 |
| PIP Howeson London Limited | Manufacturing | 2013 |
| PIP Spence Limited | Other services | 2016 |
| Pipaway Engineering Limited | Manufacturing | 1966 |
| Pipaway Trustees Limited | Professional & scientific | 2020 |
| Pipeline GEN Ltd | Professional & scientific | 2018 |
| Pipeline Publishing Services Limited | Information & communication | 2012 |
| Piston House Ltd | Wholesale & retail | 2023 |
| Pitch Design Consultancy Ltd | Wholesale & retail | 2013 |
| Pixelar Limited | Information & communication | 2014 |