| Pneuleak Limited | Professional & scientific | 2025 |
| Pneumax Limited | Wholesale & retail | 1990 |
| PNP54 Limited | Other services | 2019 |
| PNS Finance Limited | Professional & scientific | 2013 |
| PNT Property Investment Ltd | Real estate | 2016 |
| PO13 Land 1 Ltd | Real estate | 2023 |
| Pocket HR Limited | Administrative & support | 2017 |
| Pococks (Estate Agents) Limited | Real estate | 2007 |
| POD Orlem PL Ltd | Wholesale & retail | 2015 |
| Podcast Cares Ltd | Information & communication | 2025 |
| Poddi (Hampshire) Limited | Administrative & support | 2013 |
| Podium Sportswear Ltd | Wholesale & retail | 2017 |
| Pods Grow Together Limited | Education | 2026 |
| Poetic Minds Limited | Other services | 2009 |
| Pofta Buna LA Maria Ltd | Hospitality | 2025 |
| POG Pharmacometrics Limited | Professional & scientific | 2018 |
| Point Cosmetics Limited | Health & social care | 2009 |
| Point One Products Limited | Wholesale & retail | 2021 |
| Point Source Limited | Real estate | 2012 |
| Pointout Assets Limited | Real estate | 2025 |
| Pointstrike Limited | Wholesale & retail | 2025 |
| Pokeben Limited | Wholesale & retail | 2023 |
| Pokeesaint Ltd | Wholesale & retail | 2025 |
| Pokhara Food Ltd | Hospitality | 2025 |
| Polar 2 Energy Ltd | Professional & scientific | 2017 |
| Polaris Properties Limited | Real estate | 2013 |
| Policy Research Associates Limited | Other services | 1984 |
| Policy Research Publications Limited | Information & communication | 1986 |
| Polish Food Store Ltd | Wholesale & retail | 2019 |
| Polish Prune and Perfect Property Maintenance Ltd | Households | 2025 |
| Polish Supermarkets Ltd | Wholesale & retail | 2010 |
| Polishbeautybyrinsy Ltd | Other services | 2024 |
| Polly Dolly DOO DAH Limited | Manufacturing | 2021 |
| Polmus Ltd | Other services | 2014 |
| Polonia Trade Ltd | Wholesale & retail | 2025 |
| Polski Basket Ltd | Wholesale & retail | 2025 |
| Polyclear Holdings Limited | Professional & scientific | 2003 |
| Polyclear Limited | Manufacturing | 1976 |
| Polycryst Ltd | Wholesale & retail | 2004 |
| Polydot Ltd | Extraterritorial | 2003 |
| Polygon CT Limited | Households | 2025 |
| Polygon Property Partnership Ltd. | Real estate | 2006 |
| Polymeric Tapes Limited | Manufacturing | 2003 |
| Polystar Plastics (Holdings) Limited | Administrative & support | 2013 |
| Polystar Plastics Recycling Limited | Water & waste | 2021 |
| Polystar Private Estates Limited | Real estate | 2021 |
| Pondaqs Ltd | Construction | 2022 |
| Pondwell (Isle of Wight) Limited | Real estate | 2008 |
| Poohli Property Ltd | Real estate | 2025 |
| Pool & Sons Holdings Limited | Financial services | 2025 |
| Poole (Infinity 338) Ltd | Construction | 2019 |
| Poolstore UK Limited | Wholesale & retail | 2000 |
| POP & Push Skate School CIC | Education | 2026 |
| POP 247 Ltd | Administrative & support | 2026 |
| POP in Pizza & Kebab Ltd | Hospitality | 2018 |
| POP the Cork Ltd | Hospitality | 2020 |
| Popado UK Ltd | Hospitality | 2024 |
| Popat Investments Limited | Hospitality | 2017 |
| Poplar Way Management (Hedge END) Limited | Real estate | 1998 |
| Popped in for One Limited | Hospitality | 2018 |
| Poppies Plaice Southern Ltd | Wholesale & retail | 2014 |
| Poppies Southampton Ltd | Administrative & support | 2023 |
| Popplewell PUB Co Ltd | Hospitality | 2024 |
| Popsi’S Ltd | Hospitality | 2017 |
| Populand Ltd | Information & communication | 2019 |
| Popy Trans Limited | Transport & logistics | 2012 |
| Port and Coastal Solutions Ltd | Professional & scientific | 2019 |
| Port Flyer Communications Ltd | Professional & scientific | 2023 |
| Port Penlee Limited | Arts & recreation | 1998 |
| Port Skills Limited | Extraterritorial | 2018 |
| Port Tyre Solutions Limited | Administrative & support | 2023 |
| Porter Robson Limited | Professional & scientific | 2022 |
| Porter Robson Property Limited | Construction | 2024 |
| Porterco Ltd. | Wholesale & retail | 2017 |
| Porters Charcuterie Ltd | Hospitality | 2023 |
| Porters Property Ltd | Construction | 2024 |
| Porthill Limited | Professional & scientific | 1986 |
| Portland Eurotrading Limited | Manufacturing | 1992 |
| Portland Hometel Ltd | Hospitality | 2024 |
| Portland Legal Debt Collection Limited | Administrative & support | 2010 |
| Portland Marina Limited | Extraterritorial | 2010 |
| Portland Street Practice Ltd | Health & social care | 2011 |
| Portland Trading Enterprises Limited | Wholesale & retail | 2007 |
| Portman Court Management Company (Southampton) Limited | Households | 1996 |
| Portman Investments London Ltd | Real estate | 2018 |
| Portrush Pictures Limited | Information & communication | 2023 |
| Portsdown Hill Developments Limited | Construction | 2019 |
| Portside Meet and Greet Ltd | Transport & logistics | 2017 |
| Portsmouth Moorings Ltd | Administrative & support | 2022 |
| Portsmouth Motor Cycle Racing Club Limited | Arts & recreation | 2004 |
| Portsmouth Removals and Storage Limited | Professional & scientific | 1998 |
| Portswood Euro Market Ltd | Wholesale & retail | 2026 |
| Portswood Hand Car Wash Ltd | Administrative & support | 2024 |
| Portswood Mini Market Ltd | Wholesale & retail | 2023 |
| Portswood Mini Mart Ltd | Wholesale & retail | 2017 |
| Portswood Pallets Limited | Wholesale & retail | 2024 |
| Portswood Peri Peri Limited | Hospitality | 2018 |
| Portswood Property Limited | Real estate | 2024 |
| Portswood PUB Co Limited | Hospitality | 2019 |
| Portswood Residents' Gardens Ltd | Arts & recreation | 2005 |