| Osprea Logistics Limited | Wholesale & retail | 1999 |
| Ostlers Barn Management Limited | Construction | 2015 |
| Othello Way Management Company Limited | Households | 2019 |
| Ourean Investments Limited | Financial services | 2024 |
| Ovenhall Ltd | Administrative & support | 2021 |
| Overlooked and Underestimated CIC | Professional & scientific | 2023 |
| Oxana Care Limited | Financial services | 2025 |
| Oyster Capital Holdings Limited | Professional & scientific | 2008 |
| P & G Property Holdings Ltd | Real estate | 2016 |
| P & JKW Limited | Construction | 2013 |
| P & S Abbott Holdings Ltd | Financial services | 2019 |
| P H Consultancy Limited | Health & social care | 2009 |
| P H Social Work Limited | Professional & scientific | 2010 |
| P Smith Construction Ltd | Construction | 2018 |
| P. Crawford (Contracting) Limited | Agriculture & fishing | 2005 |
| P.G Construction Limited | Construction | 2022 |
| Paddlesports Coaching Ltd | Education | 2023 |
| Pager Power EOT Limited | Administrative & support | 2022 |
| Pager Power Limited | Professional & scientific | 1997 |
| Painters at the Angel Ltd | Extraterritorial | 2023 |
| Painters Cafe Ltd | Hospitality | 2022 |
| Palagio Pictures Limited | Information & communication | 2022 |
| Pallet Racking Services Limited | Extraterritorial | 2016 |
| Palmer Hamilton Limited | Extraterritorial | 2015 |
| PAN Anglia (Country Merchants) Limited | Wholesale & retail | 1962 |
| Panemondial Ltd | Manufacturing | 2013 |
| Parade Consulting Limited | Information & communication | 2005 |
| Paraguard AV Limited | Professional & scientific | 2019 |
| Paramount Pubs Limited | Hospitality | 2024 |
| Parc-Y-Coed Residents Company Limited | Households | 2019 |
| Park Gate Management Company (Ipswich) Limited | Real estate | 2014 |
| Park View Residents Association (South Kirkby) Limited | Households | 1992 |
| Parkers Horticultural Services Limited | Administrative & support | 2024 |
| Parkway Metalcrafts Limited | | 1972 |
| Path Way Yoga Ltd | Other services | 2024 |
| Patio Awnings UK Ltd | Other services | 2021 |
| Patricia Thompson Limited | Hospitality | 2022 |
| Paul Charles Recruitment Limited | Administrative & support | 2001 |
| Paul Copeland Ltd | Information & communication | 2018 |
| Paul Leonard Estates Limited | Administrative & support | 2017 |
| Paul Myerson Hvac Maintenance Ltd | Construction | 2015 |
| Paul Richardson Recycling Limited | Water & waste | 2011 |
| Paul Roach Classics Limited | Wholesale & retail | 2011 |
| Paul Slinger Ltd | Information & communication | 2021 |
| Paul Tillcock Financial Solutions Limited | Professional & scientific | 2009 |
| Pawsome RAW Ltd | Wholesale & retail | 2025 |
| PDR Group Electrical Services Ltd | Construction | 2022 |
| Peanut Pools Ltd | Arts & recreation | 2023 |
| Pelican Family Investments | Financial services | 2014 |
| Penez Packaging Solutions Limited | Hospitality | 2009 |
| Pentel Limited | Real estate | 2001 |
| Pentwyn Limited | Information & communication | 2018 |
| Perfect Smile Clinic Ltd | Health & social care | 2014 |
| Peter & SON Limited | Transport & logistics | 2025 |
| Peter Brand Farms Limited | Agriculture & fishing | 1991 |
| Peter Nott & SON Limited | Agriculture & fishing | 2008 |
| Peter Robson Architects Limited | Professional & scientific | 1988 |
| Peter Whitney Limited | Administrative & support | 2003 |
| Peterb Construction and Technical Services Ltd | Construction | 2011 |
| Pexgo Limited | Transport & logistics | 2000 |
| Pexon Limited | Hospitality | 2016 |
| Peyton Foods Limited | Hospitality | 2013 |
| PFP Specialists Ltd | Administrative & support | 2018 |
| PH Contractor Services Limited | Administrative & support | 2024 |
| Pharmamate Limited | Information & communication | 2026 |
| Pharos Capital Ltd | Financial services | 2019 |
| Phillips Engineering Limited | Professional & scientific | 2011 |
| Phlomis Limited | Information & communication | 2017 |
| Phoenix Farm Models Ltd | Administrative & support | 2023 |
| Photographer - MAX Earey Ltd | Professional & scientific | 2016 |
| Pinnacle Shutters Ltd | Construction | 2022 |
| Pint of Perfection Limited | Hospitality | 2025 |
| Pirtsemit Limited | Administrative & support | 2010 |
| Pittendrigh Farms Limited | Agriculture & fishing | 1973 |
| Pizza on the Green Ltd | Hospitality | 2021 |
| PK Carpentry Limited | Construction | 2005 |
| Playmakr Sports Coaching Ltd | Arts & recreation | 2026 |
| Plhg Direct Limited | Professional & scientific | 2018 |
| Plusopedia Ltd | Education | 2021 |
| PM Haulage Limited | | 1985 |
| PM Solutions Sudbury Ltd | Professional & scientific | 2025 |
| PN Hospitality Ltd | Hospitality | 2025 |
| Polaris Power and Data Limited | Administrative & support | 1993 |
| Pole Deli Kajtus Ltd | Wholesale & retail | 2019 |
| Polygrow Plastics Limited | | 1971 |
| Polyspiral Limited | Professional & scientific | 2018 |
| Pontian Project One Limited | Real estate | 2026 |
| Pontus Offshore Limited | Transport & logistics | 2017 |
| Pool Engineering Ltd | Construction | 2022 |
| Poolheath Residents Association Limited | Households | 1984 |
| POP Design Limited | Information & communication | 2002 |
| Portland House Residents Association Limited | Real estate | 2006 |
| Posy Style Limited | Wholesale & retail | 2023 |
| Pourconcretedecisions (UK) Ltd | Information & communication | 2026 |
| Powell Property Portfolio Limited | Real estate | 1996 |
| Power Plant (East Anglia) Limited | Manufacturing | 2009 |
| Powers Unlimited Limited | Real estate | 2014 |
| Pratyahara International Ltd | Arts & recreation | 2023 |
| Precision Made Joinery Limited | Construction | 2015 |
| Prefect Controls Ltd | Manufacturing | 1997 |