| PMO 42 Ltd | Professional & scientific | 2017 |
| PNW Studios Limited | Professional & scientific | 2015 |
| Pocket CFO Limited | Professional & scientific | 2016 |
| Pocket J Limited | Wholesale & retail | 2007 |
| Poem Jewellery Ltd | Wholesale & retail | 2022 |
| Points and Lines Limited | Professional & scientific | 2023 |
| Polaris UK Holdings Ltd | Financial services | 2022 |
| Policystack Ltd | Information & communication | 2026 |
| Polish Advertiser Ltd | Information & communication | 2020 |
| Polkadots Nursery @ Athlone Limited | Health & social care | 2017 |
| Polkadots Nursery Ltd | Health & social care | 2013 |
| Pollen Careers Limited | Administrative & support | 2022 |
| Pollinator Limited | Professional & scientific | 2003 |
| POM Resources Ltd | Information & communication | 2016 |
| Pomegranate Associates Limited | Administrative & support | 2019 |
| PON Access and Rigging Ltd | Construction | 2024 |
| Poneke Construction Limited | Construction | 2022 |
| Pont Construction Ltd | Construction | 2020 |
| Poor Millionaire Limited | Wholesale & retail | 1999 |
| POP Capital Ltd | Extraterritorial | 2015 |
| Popcorn Holdings Limited | Financial services | 2022 |
| Popes Court Limited | Households | 1986 |
| Popes Grove Ltd | Professional & scientific | 2015 |
| Poppy Jewellery & Accessories Ltd | Wholesale & retail | 2019 |
| Porthos & Co Ltd | Information & communication | 2019 |
| Portobello 31 Holdings Ltd | Professional & scientific | 2026 |
| Positive Emissions Limited | Financial services | 2012 |
| Pottle and Sparks Limited | Real estate | 2021 |
| Pound MAX Limited | Wholesale & retail | 2018 |
| Power Door Solutions Limited | Other services | 2012 |
| Power Engineering (London) Limited | Wholesale & retail | 2009 |
| Powerhouse Design and Engineering Ltd. | Manufacturing | 1992 |
| Powerjam Bands CIC | Education | 2022 |
| Powertrain Group Ltd | Administrative & support | 2024 |
| PPE Stock Shop Limited | Wholesale & retail | 2018 |
| PR in a Box Limited | Information & communication | 2016 |
| PR Protrans Ltd | Transport & logistics | 2019 |
| PR Publications Limited | Information & communication | 1984 |
| Practical Acts Ltd | Professional & scientific | 2025 |
| Praeda Consulting Limited | Construction | 2003 |
| Pranvera Development Limited | Construction | 2025 |
| Preciosa LDN Ltd | Wholesale & retail | 2022 |
| Precision Belting Solutions Ltd | Construction | 2026 |
| Precision Flooring Contracts Ltd | Construction | 2025 |
| Prem Rail Consultancy Limited | Manufacturing | 2012 |
| Premier Locate Limited | Administrative & support | 2014 |
| Premier London Rental Ltd | Real estate | 2025 |
| Premium Auto Services Ltd | Manufacturing | 2025 |
| Present NOW Ltd | Education | 2024 |
| Prestige Cafe Ltd | Hospitality | 2019 |
| Preston Holidays (IP) Ltd | Administrative & support | 2014 |
| Pretzel Communications Limited | Professional & scientific | 2026 |
| Price Goblin Limited | Information & communication | 2024 |
| Pricklipear Ltd | Administrative & support | 2021 |
| Prime & Naturals (UK) Limited | Health & social care | 2022 |
| Prime Air Ventilation Ltd | Construction | 2017 |
| Prime Relocations Ltd | Hospitality | 2026 |
| Prime Window Cleaning Ltd | Administrative & support | 2025 |
| Primera Fitness Ltd | Administrative & support | 2024 |
| Primex Property Services Ltd | Construction | 2019 |
| Primis Personnel Associates Ltd | Administrative & support | 2024 |
| Pristine Plumbing & Heating Limited | Construction | 2013 |
| Pro.Plast Services Ltd | Construction | 2025 |
| Probets Properties Ltd | Hospitality | 2016 |
| Prodigious Professional Services Limited | Construction | 2014 |
| Profast Services Ltd | Administrative & support | 2024 |
| Professional Project Solutions Limited | Professional & scientific | 2004 |
| Professional Recruitment Staffing Ltd | Administrative & support | 2021 |
| Professor Puzzle Limited | Wholesale & retail | 2002 |
| Progress International Performance Consulting Limited | Extraterritorial | 2000 |
| Proietti Tech UK Ltd | Information & communication | 2020 |
| Project Solved Ltd | Construction | 2020 |
| Projonix Ltd | Information & communication | 2014 |
| Promethean Systems Ltd | Manufacturing | 2025 |
| Promise Aesthetics Limited | Other services | 2025 |
| Promotora Wines of Chile UK Limited | Professional & scientific | 2003 |
| Propcentric Ltd | Real estate | 2024 |
| Proper Aussie Limited | Manufacturing | 2025 |
| Proper Food Collective Ltd | Wholesale & retail | 2019 |
| Property Invest Finder Limited | Real estate | 2016 |
| Propertyware Limited | Real estate | 2015 |
| Propterity Limited | Extraterritorial | 2026 |
| Prosaic Invest Limited | Administrative & support | 2016 |
| Prosperity for Ukraine Ltd | Health & social care | 2022 |
| Proud Homes Construction Ltd | Construction | 2017 |
| Proudthai Retreat Ltd | Other services | 2025 |
| Provalis Group Ltd | Financial services | 2025 |
| Proventis Limited | Information & communication | 2002 |
| PRS Services Management LLP | | 2013 |
| Prva Limited | Health & social care | 2021 |
| Pryzm View Ltd | Other services | 2026 |
| PS 24-7 Ltd | Construction | 2014 |
| PS Recruits Ltd | Administrative & support | 2018 |
| PSG 3000 Ltd | Financial services | 2019 |
| PSG IV Financial, Management and Strategic Solutions Ltd | Professional & scientific | 2024 |
| PSR 3000 Ltd | Real estate | 2026 |
| Psych Nutritionist Ltd | Health & social care | 2022 |
| Public Spirit Limited | Real estate | 2002 |
| Puccino's AKM Twickenham Plat Ltd | Hospitality | 2022 |
| Pudding Communications Limited | Information & communication | 2011 |