| OSV Home Improvements Ltd | Construction | 2020 |
| OTP Energy Limited | Wholesale & retail | 2022 |
| Otrum Ltd | Professional & scientific | 2020 |
| Oxborough Properties Ltd | Professional & scientific | 2014 |
| Oxford Haulage Limited | Transport & logistics | 2024 |
| Oynk Ltd | Professional & scientific | 2024 |
| OZONE239 Ltd | Hospitality | 2026 |
| P & I Marketing Co (Pimaco) Ltd | Manufacturing | 2021 |
| P Howes Limited | Manufacturing | 2025 |
| P Soldier Ltd | Transport & logistics | 2017 |
| P. J. Services (EU) Ltd | Wholesale & retail | 2010 |
| P.& W.Bruce Investments Limited | Hospitality | 1955 |
| P.A. Groves Homes LLP | | 2006 |
| P.G. Horticulture Limited | Wholesale & retail | 2009 |
| P.J Thewlis Associates Limited | Information & communication | 2004 |
| Pact Retail Accessories (UK) Limited | Wholesale & retail | 2007 |
| Paddington Ticket Auctions Limited | Wholesale & retail | 1999 |
| Paddocks Farm Training Limited | Administrative & support | 2024 |
| Paddox Limited | Professional & scientific | 2026 |
| Padpad Ventures Ltd | Financial services | 2025 |
| Pagan Props Ltd | Professional & scientific | 2024 |
| Paicu Ltd | Information & communication | 2021 |
| Paint N Powder Services Ltd | Manufacturing | 2014 |
| Pairs Footwear Limited | Wholesale & retail | 1976 |
| Palmer Pallets (Daventry) Limited | Administrative & support | 2003 |
| Pama 1 Ltd | Real estate | 2019 |
| Park Leys Management Limited | Administrative & support | 2019 |
| Parkhouse Group Investments Limited | Financial services | 2025 |
| Parlance Agency Ltd | Information & communication | 2025 |
| Paul Howlett Flooring Installations Ltd | Construction | 2024 |
| Paul Miller Design Limited | Administrative & support | 2009 |
| Paul Norman Heating & Plumbing Limited | Construction | 2006 |
| Paul Rowles Limited | Construction | 2012 |
| Paul Titcombe Consulting Ltd | Information & communication | 2025 |
| Paul Upfield & Associates Limited | Professional & scientific | 2001 |
| Pauline Turner Limited | Real estate | 2010 |
| Pblsuk Limited | Administrative & support | 2016 |
| PCH Technical Limited | Professional & scientific | 2024 |
| Peacock LB Ltd | Hospitality | 2021 |
| Pegasus Consultancy Services Ltd | Information & communication | 2003 |
| Pekst International Limited | Professional & scientific | 2023 |
| Pelle Investments Ltd | Financial services | 2021 |
| Pelle Pack Limited | Wholesale & retail | 2017 |
| Pelle Tech Ltd | Information & communication | 2024 |
| Pentagon Specialist Products Limited | Construction | 2024 |
| People Product Places Ltd | Professional & scientific | 2025 |
| Performance Parts Ltd. | Wholesale & retail | 1999 |
| Performance Tube Ltd | Wholesale & retail | 2023 |
| Periscope Live Limited | Administrative & support | 2012 |
| Perkin Guns Ltd | Wholesale & retail | 2020 |
| Pet Education Training & Behaviour Council Ltd | Other services | 2016 |
| Peter Gwynne Motorsport Ltd | Wholesale & retail | 2009 |
| Petite Amelie UK Ltd | Manufacturing | 2021 |
| Petrol Limited | Professional & scientific | 2017 |
| PG Carpet Cleaning Ltd | Administrative & support | 2026 |
| Phillips Autos (Banbury) Limited | Wholesale & retail | 2008 |
| Phillips Property Maintenance Limited | Construction | 2009 |
| Phoenix FAN Test Limited | Public administration | 2017 |
| Phoenix Interim Management Limited | Professional & scientific | 2010 |
| Phoenix Residential Property Management Ltd | Real estate | 2026 |
| Physio and Therapy London Ltd | Health & social care | 2015 |
| Pickaproduct Ltd | Wholesale & retail | 2026 |
| Picolino Pizza Limited | Hospitality | 2022 |
| Picture IT Productions Ltd | Information & communication | 2025 |
| Pilkington Farms Limited | Agriculture & fishing | 2013 |
| Pinkie Nails 20 Ltd | Other services | 2024 |
| Pipe Rescue 24/7 Plumbing Ltd | Construction | 2026 |
| Piping Hot Cookers Ltd | Construction | 2009 |
| Pipirig Ltd | Construction | 2023 |
| Pipu Ltd | Wholesale & retail | 2022 |
| Pirie Palmann Holdings Limited | Financial services | 2019 |
| Pixcroft Marine Ltd | Manufacturing | 2003 |
| Plantool Limited | Administrative & support | 1981 |
| Plasticus Ltd | Professional & scientific | 2018 |
| Platinum Tiling (Midlands) Limited | Construction | 2020 |
| Plovair Limited | Professional & scientific | 2016 |
| Plum & Ashby Home Essentials Ltd | Wholesale & retail | 2025 |
| Plumber NOW 24/7 Ltd | Construction | 2026 |
| Plumbsharp Ltd | Construction | 2018 |
| PMA Business Services Ltd | Professional & scientific | 2008 |
| PNT Residentials Ltd | Real estate | 2024 |
| Pocco Ltd | Information & communication | 2018 |
| Poet Archives Ltd | Wholesale & retail | 2023 |
| Point Zero Surveys Ltd | Construction | 2014 |
| Polestar Technology Co., Ltd | Professional & scientific | 2022 |
| Poli-Film UK Limited | Manufacturing | 1976 |
| Polymark (GB) Limited | Wholesale & retail | 1995 |
| Polymark Holdings Limited | Financial services | 2013 |
| Polymark International Limited | Professional & scientific | 1950 |
| Polymark Pensions Limited | Extraterritorial | 1967 |
| Polymer Plating Limited | | 1969 |
| Polytex International (UK) Limited | Wholesale & retail | 2001 |
| Poolview Garage (2025) Limited | Wholesale & retail | 2025 |
| Popovich Ltd | Other services | 2015 |
| Porumbion Ltd | Administrative & support | 2017 |
| Potenza Projects Limited | Construction | 1995 |
| Potter Limited | Extraterritorial | 2018 |
| PPC for the People Limited | Professional & scientific | 2015 |
| Pr'Nce Kitchens and Bedrooms Ltd | Wholesale & retail | 2025 |
| Practical Computing Limited | Information & communication | 2010 |