| Peploe-Williams Academy Limited | Arts & recreation | 2019 |
| Peratone Limited | Manufacturing | 1978 |
| Perceptium Limited | Information & communication | 2014 |
| Performance Entertainment Productions Limited | Extraterritorial | 2012 |
| Perse Phoenix Ltd | Other services | 2022 |
| Peter Bassett Limited | Wholesale & retail | 2013 |
| Peter Harrison Consulting Ltd | Professional & scientific | 2011 |
| Pethel Marali Two Ltd | Real estate | 2023 |
| Petkov Solutions Ltd | Information & communication | 2025 |
| Petrascare Limited | Health & social care | 2019 |
| Petunia Cleaning Services Ltd | Administrative & support | 2025 |
| Pexton Financial Partnerships Ltd | Professional & scientific | 2025 |
| PGP Networks Ltd | Information & communication | 2024 |
| PGP Strategy Ltd | Extraterritorial | 2024 |
| PGS Plumbing and Heating Ltd | Energy | 2008 |
| Phaze One Mobile Ltd | Information & communication | 2012 |
| Philip Davies (Heritage and Planning) Limited | Professional & scientific | 2011 |
| Phillips & Sons (Buckingham) Limited | Wholesale & retail | 1946 |
| Phillips Advisory Ltd | Public administration | 2026 |
| PHN Consulting Limited | Professional & scientific | 2015 |
| Photography MK Ltd | Professional & scientific | 2019 |
| PHP Consultancy Services Limited | Professional & scientific | 2016 |
| Piano Restorations (UK) Limited | Administrative & support | 2014 |
| Piano Tuning Services Limited | Other services | 2001 |
| Picc (UK) Ltd | Education | 2002 |
| Picot Properties Limited | Real estate | 2024 |
| Picsell Creative Limited | Administrative & support | 2021 |
| Piggery Property Limited | Real estate | 2025 |
| Pillai’S Kitchen Ltd | Hospitality | 2023 |
| Pilot Financial Systems Limited | Information & communication | 2022 |
| Pink Cleaning Bucks Ltd | Administrative & support | 2024 |
| PIP Bains Consulting Ltd | Professional & scientific | 2023 |
| Pitchfork and Pencil Ltd | Professional & scientific | 2021 |
| Pizza Plus (NE) Limited | Hospitality | 2018 |
| PJ Dart Ltd | Professional & scientific | 2018 |
| PJC Ltd | Professional & scientific | 2012 |
| PJK Driver Services Limited | Transport & logistics | 2021 |
| PK Consulting Ltd | Professional & scientific | 2024 |
| Planet Refill Ltd | Wholesale & retail | 2020 |
| Planning Development Management Limited | Professional & scientific | 2010 |
| Plasma Beam Games Limited | Information & communication | 2018 |
| Platinum Fitness Academy Ltd | Arts & recreation | 2025 |
| Plover Accounting Solutions Ltd | Professional & scientific | 2021 |
| Plsc Management Ltd | Real estate | 2015 |
| Plsc Properties LLP | | 2017 |
| Plumpton Park Ltd | Health & social care | 2012 |
| PNB Consult Limited | Professional & scientific | 2019 |
| Podsystem Limited | Information & communication | 1999 |
| Pointzero Limited | Arts & recreation | 2001 |
| Polecam Limited | Professional & scientific | 2000 |
| Polecam UK Holdings Ltd | Financial services | 2026 |
| Polished Cleaning Services Limited | Extraterritorial | 2010 |
| Polka DOT PIE Limited | Wholesale & retail | 1977 |
| Porsche Inspections Limited | Wholesale & retail | 2016 |
| Powell Properties Ltd | Real estate | 2008 |
| Power Grid Projects Ltd | Construction | 2023 |
| Powerway Electrical Services Ltd | Manufacturing | 2023 |
| Pragisys Ltd | Information & communication | 2013 |
| Praniti Property Ltd | Households | 2025 |
| Precious Little Time Ltd | Real estate | 2022 |
| Preeyan Investments Limited | Health & social care | 2011 |
| Prefix Services Ltd | Construction | 2025 |
| Premier Auto Services Limited | Wholesale & retail | 2003 |
| Premier Hearing Care Holdings Ltd | Wholesale & retail | 2023 |
| Premier Power Race and Performance Engines Limited | Wholesale & retail | 2005 |
| Prena Enterprise Ltd | Professional & scientific | 2017 |
| Preston Farms Limited | Agriculture & fishing | 1964 |
| Pretty Gorgeous CIC | Education | 2023 |
| Pride-Eye Distribution Limited | Construction | 2010 |
| Prime Construction Works Limited | Construction | 2025 |
| Primrose Hall Nursery Limited | Wholesale & retail | 2025 |
| Pro-Fection Profiling Ltd | Administrative & support | 2017 |
| Proactive IT Support Limited | Information & communication | 2016 |
| Probadge Ltd | Manufacturing | 2003 |
| Probox Drawers LLP | | 2011 |
| Probox Ltd | Manufacturing | 2024 |
| Probox Systems Limited | Wholesale & retail | 2019 |
| Product Assurance Limited | Administrative & support | 1989 |
| Product Leaders Advisory Ltd | Information & communication | 2026 |
| Profile Resourcing Limited | Administrative & support | 2001 |
| Profound IT Limited | Information & communication | 2006 |
| Progressive Classics Ltd | Administrative & support | 2018 |
| Progressive Grand Touring Ltd | Administrative & support | 2013 |
| Progressive Inception Ltd | Administrative & support | 2013 |
| Progressive Motorsport Group Ltd | Administrative & support | 2016 |
| Progressive Motorsport Limited | Administrative & support | 2006 |
| Progressive Simulation Ltd | Extraterritorial | 2013 |
| Prolific Payroll Limited | Professional & scientific | 2023 |
| Proresurima Limited | Real estate | 2026 |
| Protrain Racing Products Limited | Manufacturing | 1983 |
| PTP Labs LLP | | 2016 |
| Ptrm Consultancy Ltd | Professional & scientific | 2026 |
| Public House Investments Ltd | Hospitality | 2023 |
| Pulse Training Solutions (PTS) Limited | Education | 2004 |
| Pulsus Limited | Transport & logistics | 2014 |
| Purdew Design Limited | Professional & scientific | 2016 |
| Pure Hands on Ltd | Health & social care | 2022 |
| Pure Patisserie Ltd | Manufacturing | 2019 |
| Pureclear Ltd | Information & communication | 2007 |
| Purefinish Cleaning Services Limited | Other services | 2012 |