| Phenomenal Healthcare Limited | Health & social care | 2021 |
| Pheriyx Ltd | Information & communication | 2026 |
| Phez Media Limited | Information & communication | 2025 |
| PHG Capital Limited | Real estate | 2013 |
| PHG Consulting Engineers Ltd | Professional & scientific | 2013 |
| PHG EOT Trustee Limited | Professional & scientific | 2022 |
| PHG Residential Limited | Real estate | 2021 |
| PHH Analytical Limited | Professional & scientific | 2017 |
| PHH8 Ltd | Real estate | 2022 |
| PHI Trading Ltd | Other services | 2020 |
| Phil Boorman Photography Limited | Professional & scientific | 1994 |
| Phil Evans & Sons (Builders & Contractors) Limited | Construction | 1987 |
| Phil James Specialist Cars UK Ltd | Wholesale & retail | 2019 |
| Phil N. Jones Ltd. | Construction | 2003 |
| Phil Roberts Property Services Ltd | Real estate | 2016 |
| Phil Thompson Dining Limited | Hospitality | 2013 |
| Phil's Cuisine Limited | Hospitality | 2016 |
| Philharmonic Limited | Hospitality | 2016 |
| Philine Group Ltd | Wholesale & retail | 2025 |
| Philip Asmart Limited | Wholesale & retail | 2021 |
| Philip Harries Unix Consulting Limited | Information & communication | 2011 |
| Philips Road Engineering (NO. One) Limited | Professional & scientific | 1966 |
| Philips Road Engineering Limited | Professional & scientific | 1964 |
| Phillippa Jane Jewellery Ltd | Other services | 2025 |
| Phillips (Holdings & Investments) Ltd | Financial services | 2025 |
| Phillips Capital Investments Ltd | Real estate | 2026 |
| Phillips Project Engineering Limited | Professional & scientific | 2007 |
| Phillips Reed Services Limited | Wholesale & retail | 2017 |
| Phillips Turner Associates Limited | Professional & scientific | 2004 |
| Phillips-Morgan Property Limited | Real estate | 2009 |
| Phillite D UK Ltd | Administrative & support | 2014 |
| Philog Court Management Company Limited | Households | 1977 |
| Philog Store Limited | Wholesale & retail | 2025 |
| Philoscript Ltd | Information & communication | 2025 |
| Philosotree Ltd | Other services | 2019 |
| Philstone Property Limited | Real estate | 2021 |
| Phir Ltd | Wholesale & retail | 2019 |
| Phissler Limited | Wholesale & retail | 2025 |
| Phlo Solutions Ltd | Information & communication | 2020 |
| Phls Commercial Limited | Real estate | 2022 |
| Phls Holdings Limited | Financial services | 2022 |
| Phls Property Limited | Real estate | 2022 |
| Phly in the Sky Limited | Construction | 2021 |
| Phocine Ltd | Administrative & support | 2019 |
| Phoebus Design Limited | Other services | 2013 |
| Phoencia Euro Ltd | Financial services | 2019 |
| Phoenix 681 FC Limited | Arts & recreation | 2022 |
| Phoenix Access and Construction Ltd | Construction | 2017 |
| Phoenix BIZ Solutions Ltd | Information & communication | 2011 |
| Phoenix Capital Management | Financial services | 2019 |
| Phoenix Chauffeur Service Limited | Transport & logistics | 2017 |
| Phoenix Content Curators Ltd | Information & communication | 2018 |
| Phoenix Digital Marketing Ltd | Information & communication | 2020 |
| Phoenix Enterprise Europe | Information & communication | 2024 |
| Phoenix Facilities Ltd | Administrative & support | 2019 |
| Phoenix Film Solutions Ltd | Information & communication | 2022 |
| Phoenix Genesis Ltd | Information & communication | 2018 |
| Phoenix Glow Cleaning Limited | Administrative & support | 2025 |
| Phoenix Interpretation and Cultural Consulting Service Ltd | Professional & scientific | 2019 |
| Phoenix LEE Limited | Households | 2018 |
| Phoenix Legal Services Limited | Professional & scientific | 2003 |
| Phoenix Lubricants Ltd | Wholesale & retail | 2011 |
| Phoenix Management London Ltd | Real estate | 2019 |
| Phoenix Medical Services Ltd | Health & social care | 2015 |
| Phoenix of London Ltd | Administrative & support | 2018 |
| Phoenix Property Solutions Ltd | Construction | 2006 |
| Phoenix Psychotherapy Ltd | Health & social care | 2024 |
| Phoenix Training & Consultancy Ltd | Education | 2023 |
| Phoenix Universe Ltd | Real estate | 2026 |
| Phoenix Ventura Limited | Information & communication | 2010 |
| Phoenixjlc Limited | Financial services | 2026 |
| Phone a Plumber Limited | Construction | 2018 |
| Phone and Digis Ltd | Wholesale & retail | 2025 |
| Phone Mania Ltd | Wholesale & retail | 2014 |
| Phone Melton Tech Ltd | Wholesale & retail | 2018 |
| Phone Revive Ltd | Wholesale & retail | 2019 |
| PHONE365 Ltd | Wholesale & retail | 2012 |
| Phonecard Services Limited | Information & communication | 2000 |
| Phoneix Global Ltd | Wholesale & retail | 2025 |
| Phonetechy Ltd | Wholesale & retail | 2025 |
| Phonetronics Ltd. | Information & communication | 2017 |
| Phonewala Limited | Wholesale & retail | 2023 |
| Photoepic Ltd | Wholesale & retail | 2018 |
| Photogear Plus (UK) Limited | Wholesale & retail | 2017 |
| Photokerim Ltd | Manufacturing | 2025 |
| Photometrix Imaging Limited | Manufacturing | 2007 |
| Photon Peak Power Ltd | Energy | 2025 |
| Photonblock Science and Technology Ltd | Wholesale & retail | 2021 |
| PHOTOTRAINING4U Limited | Professional & scientific | 2008 |
| PHR Consult Ltd | Professional & scientific | 2017 |
| PHR Solutions Ltd | Construction | 2015 |
| Phusion Events Management Ltd | Manufacturing | 2019 |
| Phusis IX Consulting Ltd | Professional & scientific | 2023 |
| Phutprint Limited | Manufacturing | 2011 |
| Phuture Tech Ltd | Information & communication | 2019 |
| PHW Property Ltd | Real estate | 2003 |
| Phwoar & Peace Ltd | Information & communication | 2021 |
| Phygital Media and Events Ltd | Information & communication | 2018 |
| Phyllis & Philip Estates Limited | Households | 2025 |
| Physical Adaptation Solutions Limited | Construction | 2017 |