| Priverten Limited | Health & social care | 2014 |
| Pro Commissioning Group Limited | Other services | 2024 |
| Pro Detailing UK Limited | Wholesale & retail | 2020 |
| Pro JET Clean Ltd | Construction | 2021 |
| Pro Property Office LLP | | 2018 |
| Pro Services (Herts) Limited | Construction | 2015 |
| Pro Tutoring Plus Limited | Education | 2018 |
| Pro Vision Imaging Group Limited | Information & communication | 2022 |
| Pro-Tech Combustion Services Ltd | Construction | 2016 |
| Probuild Homes Limited | Construction | 2006 |
| Probuild Properties Ltd | Construction | 2023 |
| Procreine Ltd | Hospitality | 2025 |
| Production Design London Ltd | Information & communication | 2012 |
| Productive PA Ltd | Other services | 2016 |
| Productive Suite Ltd | Administrative & support | 2018 |
| Professional QS Ltd | Professional & scientific | 2015 |
| Profionics Limited | Manufacturing | 2024 |
| Profound Leisure Group Ltd | Arts & recreation | 2016 |
| Profound Leisure Ltd | Arts & recreation | 2025 |
| Progressive Igbo Sisters CIC | Education | 2019 |
| Project 3 Ltd | Professional & scientific | 2019 |
| Prolife Care Ltd | Health & social care | 2022 |
| Proman (Islington) Limited | Professional & scientific | 2016 |
| Proman London Limited | Real estate | 2017 |
| Promediverse Ltd | Extraterritorial | 2024 |
| Prop Culture Limited | Extraterritorial | 2025 |
| Propak Architectural Limited | Construction | 2021 |
| Propak Group Holdings Limited | Financial services | 2023 |
| Propak Group Limited | Financial services | 2021 |
| Propak Sheet Metal Limited | Manufacturing | 1977 |
| Propeller Research Limited | Professional & scientific | 2007 |
| Properties LFT Limited | Real estate | 2024 |
| Properties MR Ltd | Real estate | 2024 |
| Properties SD Limited | Other services | 2004 |
| Property Arch Group Limited | Financial services | 2025 |
| Property Arch Limited | Real estate | 2018 |
| Property Industry EYE Ltd | Information & communication | 2014 |
| Property Management by N T Ltd | Administrative & support | 2023 |
| Property Venture Group Ltd | Real estate | 2026 |
| Propertysure (UK) Limited | Other services | 2014 |
| Propinfinity Limited | Real estate | 2024 |
| Prosmatrich Ltd | Health & social care | 2023 |
| Prospec Associates Limited | Other services | 2022 |
| Prospect Hill Pictures Ltd | Information & communication | 2025 |
| Prospect Housing Group Limited | Health & social care | 2023 |
| Prosperassist Limited | Administrative & support | 2018 |
| Protect & Care Limited | Financial services | 2024 |
| Protect My Property Services Limited | Construction | 1980 |
| Protection Review Limited | Professional & scientific | 2009 |
| Protek Services Limited | Professional & scientific | 1994 |
| Protium Holdings Limited | Wholesale & retail | 2002 |
| Provision Interiors Ltd | Construction | 2025 |
| PRS Healthcare Limited | Health & social care | 2017 |
| PRS Residential Limited | Real estate | 2024 |
| PRW & Son’S Construction Ltd | Construction | 2023 |
| PSC Grab Ltd | Water & waste | 2021 |
| PSS Facilities Management Limited | Other services | 2019 |
| Pullen Property Holdings LLP | | 2022 |
| Punching Dragon Arcades Ltd | Manufacturing | 2019 |
| Pura Wealth Management Ltd | Financial services | 2017 |
| Pure Angel Developments Ltd | Real estate | 2024 |
| Pure Blue Scientific Services Limited | Professional & scientific | 2026 |
| Pure Genius Media Ltd | Information & communication | 2023 |
| Pure Invest Properties Ltd | Real estate | 2024 |
| Pure Jubilee Ltd | Professional & scientific | 2024 |
| Purely Training Ltd | Education | 2019 |
| Purlow Consulting Limited | Information & communication | 2016 |
| Purple Equum Limited | Professional & scientific | 2015 |
| Purple Talent Solutions Limited | Professional & scientific | 2000 |
| Putot & EKA Limited | Information & communication | 2016 |
| Pyramid Refurbishments Ltd | Construction | 2023 |
| Q & a Security Ltd | Administrative & support | 2006 |
| QA Passed Ltd | Information & communication | 2024 |
| Qabuild Limited | Information & communication | 2017 |
| Qabuild Realty Services Limited | Real estate | 2026 |
| Qaudfesh Technologies Ltd | Information & communication | 2026 |
| Qbyte Computing Limited | Information & communication | 2018 |
| QCP Marketing Ltd | Professional & scientific | 2023 |
| QH Public House Ltd | Hospitality | 2021 |
| QH Sandridge Ltd | Hospitality | 2019 |
| QMA Land Ltd | Real estate | 2023 |
| QS Mate Ltd | Information & communication | 2025 |
| Quack Recruitment & Training Ltd | Administrative & support | 2017 |
| Quadrant Ltd | Hospitality | 2025 |
| Quaker Star Limited | Information & communication | 2004 |
| Qualifications for Limited | Education | 2021 |
| Qualify Marketing Limited | Professional & scientific | 2023 |
| Quality Decorating Company Limited | Construction | 2015 |
| Quality Logistic Solutions Limited | Transport & logistics | 2023 |
| Quality Network Cabling Ltd | Information & communication | 2023 |
| Quality Part X Limited | Wholesale & retail | 2013 |
| Quan Electrical Ltd | Other services | 2025 |
| Quantcare Ltd | Professional & scientific | 2017 |
| Quantum Fire Limited | Construction | 2017 |
| Quantum Speed Limited | Information & communication | 2016 |
| Quattro Click Digital Ltd | Professional & scientific | 2025 |
| Queensway Dent Ltd | Health & social care | 2023 |
| Queensway Estates (Stevenage) Limited | Households | 1983 |
| Quern Group Limited | Construction | 2019 |
| Quest Consultancy Ltd | Information & communication | 2017 |