| Peter Schonthal Agencies Limited | Financial services | 1976 |
| Peter's Electrical Ltd | Construction | 2017 |
| Petersen Interiors Limited | Construction | 2013 |
| Petersen UK Properties Ltd | Real estate | 2025 |
| Petirrojos Associates Limited | Professional & scientific | 2014 |
| Petluxia Ltd | Wholesale & retail | 2025 |
| Petouch Care Services Limited | Health & social care | 2022 |
| Petrariu Construction Ltd | Construction | 2021 |
| Petrelco Ltd | Professional & scientific | 2011 |
| Petru Building Services Ltd | Manufacturing | 2025 |
| Petunia Care Homes Ltd | Health & social care | 2023 |
| Petunia Holdco Ltd | Financial services | 2018 |
| Petunia PT1 Ltd | Health & social care | 1996 |
| Peyt Consultancy Limited | Education | 2026 |
| Pezzella Ltd | Professional & scientific | 2017 |
| PFD Enorsia UK Ltd | Professional & scientific | 2022 |
| PFJ Services Limited | Construction | 2005 |
| PG Frayne Services Ltd | Professional & scientific | 2014 |
| PG32 Ltd | Hospitality | 2022 |
| PG88 Ltd | Manufacturing | 2026 |
| PGB Kingston Limited | Arts & recreation | 2022 |
| PGC Investments Limited | Real estate | 2010 |
| PGH1UK Ltd | Wholesale & retail | 2026 |
| PGM Advisory Limited | Professional & scientific | 2024 |
| PGV Trans Limited | Transport & logistics | 2026 |
| PH Lighting Ltd | Information & communication | 2026 |
| PH Physiotherapy Ltd | Education | 2015 |
| Phao Limited | Information & communication | 2011 |
| Pharm-Ace Solutions UK Limited | Administrative & support | 2025 |
| Pharma Modus Limited | Wholesale & retail | 2011 |
| Pharmaco Wembley Limited | Wholesale & retail | 2017 |
| Pharmadiet UK Ltd | Wholesale & retail | 2024 |
| Pharmalogik Limited | Wholesale & retail | 2013 |
| Pharmamed (UK) Ltd | Professional & scientific | 2012 |
| Pharmascend Academy Ltd | Education | 2025 |
| Pharmed Health Limited | Professional & scientific | 2003 |
| Pharmstrong Health and Wellness Limited | Wholesale & retail | 2019 |
| Pharmval Limited | Professional & scientific | 2023 |
| Phased Solutions Limited | Information & communication | 2021 |
| PHD Staff Ltd | Administrative & support | 2020 |
| Pheasant Consultancy Limited | Professional & scientific | 2020 |
| Phenoc Ltd | Professional & scientific | 2023 |
| Philes Finance Consulting Ltd | Professional & scientific | 2018 |
| Philip Chapper & Company Limited | Wholesale & retail | 1971 |
| Philip Hardy Ltd | Information & communication | 2025 |
| Philip Marsland Consultancy Limited | Professional & scientific | 2018 |
| Philip Tucker Consulting Ltd | Professional & scientific | 2018 |
| Phill Trade Limited | Professional & scientific | 2005 |
| Phillip Simpson Ltd | Professional & scientific | 2019 |
| Phillips Roofing Services Limited | Construction | 2024 |
| Philosophers Limited | Professional & scientific | 2002 |
| Phoebe Smith Ltd | Information & communication | 2025 |
| Phoenix Homestays Limited | Real estate | 2020 |
| Phoenix Insights Ltd | Professional & scientific | 2018 |
| Phoenix Medical Clinic Ltd | Health & social care | 2012 |
| Phoenix Nexus Limited | Wholesale & retail | 2026 |
| Phoenix Potential Ltd | Administrative & support | 2018 |
| Phoenix Results Ltd | Wholesale & retail | 2025 |
| Phoenix Universal Solutions Limited | Financial services | 2010 |
| Phoenix Vantage Limited | Financial services | 2020 |
| PHOENIX8888 Ltd | Information & communication | 2010 |
| Phoeniz Community Services Ltd | Health & social care | 2026 |
| Phonify Ltd | Wholesale & retail | 2025 |
| Photo Paper Direct Limited | Wholesale & retail | 2002 |
| Photon Recycling and Optimising Systems Limited | Professional & scientific | 2024 |
| Phox Investment Ltd | Real estate | 2013 |
| PHR Consultancy Limited | Professional & scientific | 2014 |
| PHS Associates ACC & Co Ltd | Professional & scientific | 2013 |
| PHS Group Services Limited | Administrative & support | 2025 |
| PHS Mortgage Ltd | Financial services | 2025 |
| PHS Professional Services Ltd | Professional & scientific | 2013 |
| Physioflexx Limited | Manufacturing | 2009 |
| Physionormandy Ltd | Health & social care | 2018 |
| Phytoseal Ltd | Wholesale & retail | 2020 |
| Phénix Enterprises Ltd | Real estate | 2019 |
| Picchu Management Ltd | Real estate | 2020 |
| Picchu Properties LLP | | 2021 |
| Pick N MIX Properties Ltd | Real estate | 2020 |
| Pick Nest Ltd | Wholesale & retail | 2024 |
| Pick UP Parts Limited | Wholesale & retail | 2015 |
| Pickans Ltd | Information & communication | 2022 |
| Pickwell Manor Estate Limited | Professional & scientific | 1986 |
| Picture Frames Direct Ltd | Wholesale & retail | 2019 |
| PIE 2 Brands Ltd | Wholesale & retail | 2002 |
| Pier Forty Two Consulting Ltd | Information & communication | 2013 |
| Piercings of Enfield Limited | Arts & recreation | 2021 |
| Piercings of Watford Limited | Wholesale & retail | 2021 |
| Pierian Spring Data Services Ltd | Health & social care | 2021 |
| Pigadaki Limited | Wholesale & retail | 2019 |
| Pilates Yoga Home Ltd | Health & social care | 2019 |
| Pill Bridge Pharma Ltd | Wholesale & retail | 2025 |
| Pine Consulting Group Limited | Information & communication | 2021 |
| Pine Ventures Ltd | Financial services | 2023 |
| Pineapple Stud Limited | Agriculture & fishing | 2011 |
| Pinemill Limited | Other services | 1975 |
| Pinenut Consulting Ltd | Professional & scientific | 2022 |
| Pinewood Relocations Ltd | Professional & scientific | 2022 |
| Pink Drainage Limited | Water & waste | 2021 |
| Pink Robin Graphic Design Ltd | Professional & scientific | 2023 |
| Pinkgums Ltd | Health & social care | 2019 |