| Orta Fine Properties Limited | Households | 2023 |
| Osbornes Independent Estate Agents Limited | Real estate | 2011 |
| OSC Management Company Limited | Households | 2021 |
| Osmic Solutions Limited | Professional & scientific | 2026 |
| Osocasa Ltd | Professional & scientific | 2023 |
| Otun Ltd | Hospitality | 2024 |
| OUD Retreat Ltd | Other services | 2025 |
| Ouno Creative Limited | Information & communication | 2009 |
| OUR Factory Limited | Manufacturing | 2019 |
| Outhaus Buildings Ltd | Arts & recreation | 2016 |
| Outpost Films Limited | Information & communication | 2015 |
| Over Property Services Limited | Construction | 2010 |
| Owenz Ltd | Transport & logistics | 2019 |
| Own Fashion Ltd | Wholesale & retail | 2025 |
| Oxfordpsych Course Limited | Education | 2017 |
| P J Hehir Chiropractic Limited | Health & social care | 2016 |
| P J Murphy Groundworks Ltd | Construction | 2026 |
| P&F Painting Solutions Limited | Construction | 2014 |
| P&N Heating Solutions Limited | Construction | 2016 |
| P3 Architecture and Project Management Ltd Ltd | Real estate | 2023 |
| Pabr Sales and Marketing Limited | Professional & scientific | 2009 |
| Paddock Hill Ltd | Construction | 2014 |
| Palinth Ltd | Information & communication | 2026 |
| Pallas Defence Procurement Ltd | Professional & scientific | 2021 |
| Panesar Woods LLP | | 2014 |
| Panther Corporation Ltd | Professional & scientific | 2015 |
| Paragon Climate Solutions Ltd | Construction | 2023 |
| Paramount Carpentry Ltd | Manufacturing | 2023 |
| Paranimo Limited | Information & communication | 2019 |
| Pareto Ltd | Professional & scientific | 2023 |
| Parisi Heating and Plumbing Limited | Construction | 2025 |
| Park Lane Limited | Wholesale & retail | 1981 |
| Parkwood Roofing Limited | Construction | 2005 |
| Party BUZ Ltd | Wholesale & retail | 2013 |
| Paruhang Property Investment Ltd | Real estate | 2026 |
| Pasha Construction Services Ltd | Construction | 2023 |
| Pasha Fades Ltd | Other services | 2026 |
| Passacre Limited | Information & communication | 2024 |
| Passionbrits Care Limited | Health & social care | 2025 |
| Paul Foote INK Limited | Manufacturing | 2010 |
| Pawsome Pershore Limited | Agriculture & fishing | 2025 |
| Paxora Consulting Ltd | Professional & scientific | 2021 |
| Payar Limited | Information & communication | 2013 |
| PB Engineering Solutions Limited | Professional & scientific | 2010 |
| Pbond Holdings Limited | Real estate | 2017 |
| PCS Bathrooms Ltd | Wholesale & retail | 2021 |
| PDW Associates Ltd | Wholesale & retail | 2010 |
| PE4LEARNING Limited | Education | 2016 |
| Peabody EMS Ltd | Health & social care | 2025 |
| Pear Tree Day Nursery (Farnborough) Limited | Health & social care | 2007 |
| Pear Tree Freehold Management Limited | Households | 2008 |
| Peepal Capital Ltd | Financial services | 2020 |
| Peepal Property Investments Limited | Real estate | 2021 |
| Pegh Care Limited | Health & social care | 2020 |
| Peninsula Heating and Plumbing Limited | Construction | 2016 |
| Penney's Finance School Limited | Professional & scientific | 2021 |
| PEP Contracting Ltd | Professional & scientific | 2017 |
| Perei Group Limited | Manufacturing | 1963 |
| Perfect Nail Studio Farnborough Limited | Other services | 2023 |
| Performance Advantedge Ltd | Professional & scientific | 2025 |
| Perhaps Ltd | Wholesale & retail | 2024 |
| Peri & Smash Ltd | Hospitality | 2025 |
| Peritem Consultants Ltd | Professional & scientific | 2019 |
| Periti Ltd | Professional & scientific | 2020 |
| Perky Services Limited | Health & social care | 2022 |
| Personal JET Limited | Transport & logistics | 2013 |
| Pet Hub Ltd | Wholesale & retail | 2020 |
| Peter J. Hill Associates Limited | Manufacturing | 2004 |
| Peter Minett & Partners | | 1994 |
| Petunia Services Limited | Health & social care | 2015 |
| Pharmacy Bond Limited | Health & social care | 2012 |
| Pharmacy Consulting Limited | Professional & scientific | 2002 |
| Phil Welch Limited | Wholesale & retail | 2026 |
| Philips Components Limited | Extraterritorial | 1925 |
| Philips Consumer Communications UK Limited | Extraterritorial | 1963 |
| Philips Digital UK Limited | Information & communication | 2012 |
| Philips Electronics UK Limited | Wholesale & retail | 1947 |
| Philips Titan Limited | Extraterritorial | 2000 |
| Philips Trustee Company Limited | Administrative & support | 2009 |
| Philips U.K. Limited | Professional & scientific | 1985 |
| Philly’S Limited | Hospitality | 2021 |
| Phoenix Hire & Sales Limited | Administrative & support | 2008 |
| Phrl Ltd | Real estate | 2020 |
| Physioscience Rehab Ltd | Health & social care | 2021 |
| Pick a BAP Ltd | Hospitality | 2018 |
| Pick UP My Meds Limited | Transport & logistics | 2021 |
| Picture Sound Publishing Ltd. | Information & communication | 1991 |
| Piggy Blinders Ltd | Hospitality | 2022 |
| Pinecone Solutions Limited | Information & communication | 2024 |
| Pinewood Park (426 to 437) Management Limited | Households | 1978 |
| Pink Gloves Cleaning Services Ltd | Administrative & support | 2025 |
| Pinnacle Electrics Hampshire Ltd | Construction | 2020 |
| Pioneer Installations Ltd | Construction | 2025 |
| Pitchblack Properties Limited | Other services | 2010 |
| Pittstar Technologies Ltd | Information & communication | 2023 |
| PKM Consulting Services Ltd | Information & communication | 2015 |
| PKT Investment Ltd | Real estate | 2022 |
| Plan Ecology Ltd | Professional & scientific | 2015 |
| Planning & Building Drawings Ltd | Professional & scientific | 2022 |
| Plantstar Ltd | Information & communication | 2024 |