| Park Chase Properties Limited | Real estate | 2020 |
| Park Galleries (London) Limited | Wholesale & retail | 2005 |
| Park Street People Limited | Administrative & support | 1989 |
| Park View Kinsley Ltd | Real estate | 2007 |
| Parkacre Developments Limited | Real estate | 2003 |
| Parkchapel Investments Limited | Real estate | 2021 |
| Parkland Grove Residents Limited | Households | 1998 |
| Parkmanor Estates Limited | Professional & scientific | 2004 |
| Parkside Design Limited | Other services | 2007 |
| Parr Real Estate Limited | Real estate | 2009 |
| Pars Consultancy Limited | Information & communication | 2019 |
| Pars-Tec (UK) Limited | Other services | 2003 |
| Parshotam & Co Limited | Professional & scientific | 2004 |
| Parsons Green Garden Centre CIC | Wholesale & retail | 2026 |
| Partners in Facilities Limited | Professional & scientific | 2006 |
| Partycular Ltd | Professional & scientific | 2005 |
| Passer, Chevern & Co Ltd | Professional & scientific | 2000 |
| Passion Explosion Limited | Transport & logistics | 2006 |
| Pastor Limited | Education | 1984 |
| PAT Anthony Fitzgerald | | 1998 |
| Patel Associates Limited | Professional & scientific | 2002 |
| Patel Enterprises Limited | Administrative & support | 1996 |
| Patfloce Trading Limited | Manufacturing | 2006 |
| Pathfinder International Associates Limited | Professional & scientific | 2001 |
| Pathland Limited | | 1979 |
| Patrick Kennedy | | 1998 |
| Patrick. Barrett | | 1998 |
| Pattross Powys Limited | | 1973 |
| Paul & Denis Maintenance Ltd | Construction | 2016 |
| Paul Dietman | | 1998 |
| Paul Healy Painting & Decorating Limited | Construction | 2002 |
| Paul Holman Associates Ltd. | Arts & recreation | 1997 |
| Paul Keane Associates Limited | Professional & scientific | 2003 |
| Paul Reilly Limited | Other services | 2001 |
| Paul. Fogarty | | 1998 |
| Paul. Mcmahon | | 1998 |
| Pauline's Designs Limited | Administrative & support | 1997 |
| PAUSE2WIN Limited | Health & social care | 2018 |
| Paycom Limited | Professional & scientific | 2006 |
| Payfuture IP Limited | Administrative & support | 2024 |
| Payfuture Ltd | Information & communication | 2020 |
| Payfuture Software Limited | Information & communication | 2022 |
| Payhall Consulting Limited | Professional & scientific | 1988 |
| PB Building Services Ltd | Construction | 2004 |
| PB Packaging Group Ltd | Manufacturing | 1961 |
| Peace Haven Guest House Limited | Construction | 2001 |
| Peacock Limited | Professional & scientific | 2003 |
| Peak State Ltd | Information & communication | 2014 |
| Peaklead Limited | Households | 1998 |
| Pearl River Delta Investments Limited | Professional & scientific | 2002 |
| Pearl Soft Furnishings Limited | Manufacturing | 2006 |
| Pearson Lyle Management Ltd. | Arts & recreation | 2005 |
| Pearsons Business Services Limited | Professional & scientific | 2005 |
| Peartree Investments Limited | Other services | 2001 |
| Pediment Effects Limited | Arts & recreation | 2011 |
| Peepal Care Limited | Health & social care | 2004 |
| Peephole Software Limited | | 1998 |
| Peergroup UK Limited | Professional & scientific | 2003 |
| Peerless Management Limited | Households | 1987 |
| Peerstand Limited | Professional & scientific | 2001 |
| Pegasus Kitchens and Bathrooms Ltd | Manufacturing | 2013 |
| Pembridge Trading Limited | Real estate | 1950 |
| Pennard Properties Limited | Real estate | 2002 |
| Penny J Targett Consultancy Limited | Professional & scientific | 2007 |
| Pentagons World (UK) Ltd | Professional & scientific | 1999 |
| Peoples Car Limited | Wholesale & retail | 2006 |
| Pepco (Import - Export) Limited | Wholesale & retail | 1984 |
| Perceptive Risk Consultancy Ltd | Professional & scientific | 2018 |
| Perfect Distribution Limited | Transport & logistics | 2006 |
| Perfect P.J. Engineering Limited | Manufacturing | 1996 |
| Perin Associates Limited | Real estate | 2004 |
| Period Plasterwork Ltd | Construction | 2006 |
| Pernholt Ltd | Real estate | 2006 |
| Perwood Cars (Uxbridge) Limited | Transport & logistics | 2005 |
| Perzbuild Limited | Wholesale & retail | 2005 |
| Pestle & Mortar Locum Ltd | Health & social care | 2015 |
| Peter Adler Limited | Wholesale & retail | 2001 |
| Petros (Eastcote) Limited | Other services | 2003 |
| Petunia Properties Limited | Construction | 2003 |
| Pez's of Uxbridge Limited | | 1984 |
| PGK Plumbing Limited | Construction | 2007 |
| Pgsd Limited | Administrative & support | 1988 |
| Pharma Regulatory Services Limited | Real estate | 2007 |
| Pharmico Limited | Transport & logistics | 1994 |
| Pharmvit Limited | Manufacturing | 1979 |
| Philippa Ashcroft Limited | Information & communication | 2013 |
| Phillcreates Studio Limited | Arts & recreation | 2018 |
| Phone 2 Connect.Com Ltd | Financial services | 2000 |
| Phoresters Limited | Real estate | 2000 |
| Photronics Limited | Information & communication | 2001 |
| Picnic Limited | Administrative & support | 2005 |
| Pierce Engineering Services Limited | Manufacturing | 1987 |
| Pierpont Capital Ltd | Real estate | 2014 |
| PIK Investments Limited | Real estate | 2003 |
| PIL Official Publishing Limited | Information & communication | 2012 |
| Pilkington Homes Garden and Kitchens Ltd | Construction | 2019 |
| Pimlico Properties & Investments Limited | Financial services | 2005 |
| Pineholt Sports and Social Club Limited | | 1984 |
| Pinewood Investments (UK) Ltd | Real estate | 2011 |
| Ping Plastering Limited | Arts & recreation | 2012 |