| Pharmacode Care Limited | Administrative & support | 2025 |
| Pharmacy Initiative 3 Limited | Wholesale & retail | 2000 |
| Pharmacysmiles Limited | Wholesale & retail | 2017 |
| Pharmaxhealth Ltd | Health & social care | 2024 |
| Phase 1 Enterprise Training C.I.C. | Administrative & support | 2012 |
| Phasepurpose Property Management Limited | Households | 1995 |
| Phbd Limited | Construction | 2025 |
| Phebdan Healthcare Services Limited | Administrative & support | 2018 |
| Pheng Ltd | Construction | 2014 |
| Pheonix U.K. South Limited | Construction | 2005 |
| PHG Services (London) Ltd | Construction | 2019 |
| Phibbs Developments Limited | Manufacturing | 2006 |
| Phibbs Limited | Construction | 2006 |
| Phiittein Limited | Wholesale & retail | 2025 |
| Philiphuy Limited | Real estate | 2019 |
| Philippa Robinson Consulting Limited | Professional & scientific | 2009 |
| Phillimore Square (Block B) Management Limited | Households | 2006 |
| Phillimore Square (Block C) Management Limited | Households | 2006 |
| Phillimore Square (Block D) Management Limited | Households | 2006 |
| Phillimore Square (Block E) Management Limited | Households | 2006 |
| Phillimore Square Estate Management Limited | Households | 2006 |
| PHO N Go Limited | Hospitality | 2018 |
| Phoenix 12 CIC | Education | 2024 |
| Phoenix 26 Limited | Other services | 2026 |
| Phoenix Apartments RTM Company Limited | Households | 2025 |
| Phoenix E-Commerce Limited | Wholesale & retail | 2025 |
| Phoenix Entertainment Limited | Arts & recreation | 2024 |
| Phoenix Green Netzero Housing Association Ltd | Real estate | 2026 |
| Phoenix Heights (Bilborough, Nottingham) Management Company Limited | Households | 2005 |
| Phoenix Hire Ltd | Administrative & support | 2025 |
| Phoenix House (Hill Top) Limited | Real estate | 2006 |
| Phoenix Investments Corp Ltd | Information & communication | 2022 |
| Phoenix K Agency Ltd | Financial services | 2018 |
| Phoenix Performance Centres Limited | Arts & recreation | 2011 |
| Phoenix Place Residents Management Company Limited | Households | 2015 |
| Phoenix Property Investment Company Limited | Construction | 1995 |
| Phoenix Scaffolding Limited | Professional & scientific | 2004 |
| Phoenix Smart Homes Ltd | Construction | 2021 |
| Phoenix W1 Limited | Real estate | 2016 |
| Phoenix Wellbeing Centre Ltd | Information & communication | 2021 |
| Phoenixhealthexpertuk Limited | Health & social care | 2013 |
| Phoenixwales Ltd | Wholesale & retail | 2020 |
| Phoenulla Ltd | Financial services | 2025 |
| Phones Gadgets and Games Ltd | Wholesale & retail | 2020 |
| Phorpres Management Company Limited | Households | 1987 |
| Phot Bros Ltd | Hospitality | 2025 |
| Phot Bros Management Group Ltd | Financial services | 2025 |
| Phou Investments Ltd | Real estate | 2025 |
| Physio at Your Door Physiotherapy Ltd | Health & social care | 2026 |
| PI Albany Investments Group Limited | Professional & scientific | 2021 |
| PI Albany Petroleum Ltd | Mining & quarrying | 2021 |
| PI Global Group Ltd | Professional & scientific | 2021 |
| PI Global Partners Group Limited | Professional & scientific | 2021 |
| PI Global Partners Limited | Financial services | 2006 |
| PI Installations Limited | Transport & logistics | 2013 |
| PI Petroleum Ltd | Wholesale & retail | 2021 |
| Piah Limited | Professional & scientific | 2017 |
| PIAH9K Limited | Administrative & support | 2023 |
| PIB Ltd | Transport & logistics | 2017 |
| Pibeka Limited | Information & communication | 2014 |
| Piccante Ltd | Wholesale & retail | 2019 |
| Pick UP Academy Ltd | Education | 2016 |
| Pickering Dental Surgeries Limited | Health & social care | 1950 |
| Pickkaroo Limited | Wholesale & retail | 2025 |
| Picknfixx UK Limited | Other services | 2021 |
| Picts Lane Management Company Ltd | Households | 2006 |
| Picturepages Photography Studios Ltd | Other services | 2025 |
| Picxel Limited | Real estate | 2025 |
| Picxma Trade Ltd | Wholesale & retail | 2025 |
| Pierre L M Foucaut Limited | Wholesale & retail | 2023 |
| Pierrepoint Management Co. Limited | Households | 1981 |
| Pigi Marine Services Limited | Administrative & support | 2009 |
| Pigment Printed Ltd | Manufacturing | 2020 |
| PIK Management Services Ltd | Professional & scientific | 2026 |
| Pilara Ltd | Other services | 2026 |
| Pillars Painting and Decorating Ltd | Construction | 2018 |
| Pillowell Close (Management) Company Limited | Households | 2012 |
| Pillowell Close RTM Company Limited | Households | 2013 |
| PIMENTO'62 Catering Ltd | Hospitality | 2018 |
| PIN the Tail Accessories Ltd | Other services | 2025 |
| Pinakin Rise Limited | Real estate | 2024 |
| Pinball Creative Restorations Ltd | Other services | 2025 |
| Pinball Creative Services Ltd | Manufacturing | 2020 |
| Pindoria Ltd | Wholesale & retail | 2015 |
| Pindrake Flat Management Company Limited | Households | 1979 |
| Pineroom Limited | Real estate | 1981 |
| Pinetree Homes Limited | Real estate | 2020 |
| Pinewalk Estates Limited | Real estate | 1995 |
| Pinewood Gardens (Stone Cross) Management Company Limited | Households | 2015 |
| Pinewood Management Limited | Households | 1984 |
| Pinewood Residential Care Services Ltd | Health & social care | 2022 |
| Pini Autocentre Limited | Wholesale & retail | 1994 |
| Pink Dragon UK Limited | Other services | 2016 |
| Pink Pixel Media Ltd | Professional & scientific | 2025 |
| Pinnacle Alpacas LLP | | 2013 |
| Pinnacle Care & Staffing Solutions Limited | Administrative & support | 2025 |
| Pinnacle DS Group Limited | Professional & scientific | 2021 |
| Pinnacle DS Limited | Professional & scientific | 2023 |
| Pinnacle Learning Academy Ltd | Education | 2020 |
| Pinnacle Mind Consulting Ltd | Health & social care | 2025 |