| PICTURE8 Studios Ltd | Information & communication | 2024 |
| Piedone Ltd | Transport & logistics | 2020 |
| Pierrefond Limited | Wholesale & retail | 2025 |
| Pinchbeck Fields (EC) Residents Management Company Limited | Households | 2022 |
| Pinchers of Power Limited | Construction | 2023 |
| Pinewood Grange (Stowmarket) Management Company Limited | Households | 2022 |
| Pinnacle Investments and Real Estate Limited | Real estate | 2011 |
| Piquant Foods Limited | Hospitality | 2020 |
| Piron Ltd | Construction | 2014 |
| Pishke Ltd | Construction | 2025 |
| Pixel Arts Creative Ltd | Information & communication | 2024 |
| Pixelsbeat Ltd | Information & communication | 2018 |
| PJ Cuttings Limited | Financial services | 2021 |
| PJP Limited | Wholesale & retail | 2002 |
| PK Developments (Hatfield) Ltd | Construction | 2024 |
| PKH Consultants Limited | Professional & scientific | 2015 |
| Place to Connect CIC | Health & social care | 2025 |
| Planned Action Facilities Limited | Professional & scientific | 1999 |
| Planned Action Holdings Limited | Professional & scientific | 2001 |
| Plasterite Ltd | Construction | 2019 |
| Platinum Property & Management Ltd | Real estate | 2023 |
| Play Space Tech Ltd | Information & communication | 2025 |
| Play Well Education Ltd | Education | 2023 |
| Playbox Technology (UK) Ltd | Other services | 2004 |
| Playbox Technology Innovation Studio Ltd | Information & communication | 2026 |
| Plethtech Limited | Professional & scientific | 2025 |
| Plex Web Solutions Ltd | Wholesale & retail | 2023 |
| PLM Build Ltd | Construction | 2024 |
| Plush Heating Ltd | Construction | 2021 |
| PLY Online Limited | Information & communication | 2025 |
| Pmmfl Limited | Health & social care | 2015 |
| Pnsp Limited | Real estate | 2023 |
| PO Evolutions Ltd | Information & communication | 2013 |
| Pocket Studio Ltd | Other services | 2018 |
| Point Electrical Limited | Construction | 2017 |
| Polishers Cleaning Ltd | Real estate | 2013 |
| Polskie Smaki 3 Ltd | Wholesale & retail | 2020 |
| Polyfield Property Limited | Construction | 1990 |
| Pool Plant Engineering Limited | Professional & scientific | 2004 |
| Port Meadow Productions Ltd | Information & communication | 2022 |
| Portal Payments Ltd | Information & communication | 2022 |
| Portelsa Ltd | Health & social care | 2009 |
| Portland Property Holdings Limited | Real estate | 2021 |
| Positive Communications Global Limited | Information & communication | 2009 |
| Postal Solutions Ltd | Professional & scientific | 2019 |
| Potato Shed Property Ltd. | Real estate | 2013 |
| Potent Property Limited | Construction | 2018 |
| Potential Kids Limited | Education | 2017 |
| Power Cellar Ltd | Professional & scientific | 2024 |
| Power Trident Limited | Real estate | 2025 |
| Poynter Holdings Limited | Real estate | 1991 |
| Poynter Homes Limited | Construction | 2011 |
| Ppbags Ltd | Extraterritorial | 2024 |
| Pplx Investments Ltd | Real estate | 2019 |
| PPLX2 Ltd | Professional & scientific | 2019 |
| PR Integrated Services (UK) Limited | Transport & logistics | 2023 |
| Prabaht Ltd | Other services | 2026 |
| Practitioners in Quality Limited | Professional & scientific | 2002 |
| Praediumlink Ltd | Real estate | 2019 |
| Praesidio Doors Limited | Construction | 2022 |
| Pratique Pilates Limited | Arts & recreation | 2022 |
| Pravishya Limited | Information & communication | 2012 |
| PRE Pro Ltd | Education | 2025 |
| Predator IT Limited | Information & communication | 2002 |
| Premier Therapies Ltd | Health & social care | 2019 |
| Premier Therapy Limited | Health & social care | 2004 |
| Present Projects Ltd | Construction | 2023 |
| Prestige Auto Trading Ltd | Wholesale & retail | 2019 |
| Preston Rodgers Limited | Professional & scientific | 2021 |
| Prima Lettings Limited | Real estate | 2019 |
| Prime Burgers Hatfield Limited | Hospitality | 2025 |
| Prime MVP Ltd | Construction | 2016 |
| Primeneats Limited | Administrative & support | 2025 |
| Primrose Grove Management Company Limited | Households | 2023 |
| Primrose Plus Ltd | Health & social care | 2010 |
| Primus Construction (Contracts) Limited | Construction | 2018 |
| Prns Ventures Limited | Financial services | 2025 |
| Pro SPV Ltd | Real estate | 2021 |
| Prodan Trans Ltd | Transport & logistics | 2014 |
| Prodsage Ltd | Information & communication | 2025 |
| Production by Lorenzo Ltd | Professional & scientific | 2023 |
| Professional Guarding Facilities Management Ltd | Administrative & support | 2021 |
| Profinish Tiling Ltd | Construction | 2026 |
| Pron Limited | Administrative & support | 2017 |
| Pronoid Music Services Ltd | Wholesale & retail | 2024 |
| Proper Pizza Finchley Central Ltd | Hospitality | 2024 |
| Properties Beyond Investment & Management Ltd | Real estate | 2018 |
| Properties SR Limited | Real estate | 2023 |
| Propertkare Limited | Construction | 2021 |
| Property Maintenance Solution Ltd | Construction | 2025 |
| Property Mckenzie Limited | Real estate | 2022 |
| Property Smart Solutions Limited | Real estate | 2019 |
| Propertyacs Ltd | Real estate | 2017 |
| Prospect Building Solutions Ltd | Construction | 2018 |
| Protecht IV Essentials Ltd | Wholesale & retail | 2024 |
| Prudent Accountancy Ltd | Professional & scientific | 2022 |
| Pryor Reid & Co Limited | Manufacturing | 2014 |
| PS Lifestyle Ltd | Health & social care | 2022 |
| PS Wynne Consulting Limited | Professional & scientific | 2012 |
| Ptas Construction Limited | Construction | 2023 |