| OLL Prop Co Limited | Real estate | 2019 |
| Omega Regent Limited | Information & communication | 1999 |
| One AIM Group Limited | Professional & scientific | 2007 |
| Orthos (Engineering) Limited | Manufacturing | 1956 |
| Orthos (Projects) Limited | Manufacturing | 1977 |
| Orton Lane Twycross Management Company Limited | Households | 2022 |
| Orton Properties Ltd | Real estate | 2006 |
| Osman Technologies Limited | Information & communication | 1996 |
| Oulton-Lee Research Limited | Professional & scientific | 1996 |
| Oundle Optical Company Limited | Health & social care | 2007 |
| Outwoods Holdings Limited | Financial services | 2023 |
| Outwoods Investments Limited | Real estate | 2023 |
| Oxford Mazda Limited | Wholesale & retail | 1980 |
| P J Collier Financial Services Limited | Financial services | 2003 |
| P.A. Properties Ltd. | Real estate | 1999 |
| P.G. Herringshaw Ltd | Construction | 2005 |
| P.K. Carpets Limited | Wholesale & retail | 2000 |
| Pacesetter Data Solutions Ltd | Information & communication | 2020 |
| PAG International Limited | Professional & scientific | 2001 |
| Palutti Limited | Professional & scientific | 2003 |
| Paradigm HR Limited | Administrative & support | 2017 |
| Parc Properties WW Ltd | Real estate | 2005 |
| Park Hill Training Limited | Education | 2006 |
| Park House Court (Stoke Golding) Management Co. Limited | Households | 2009 |
| Park Lodge Project | Health & social care | 2000 |
| Parmar Associates Limited | Professional & scientific | 2003 |
| Party Time (Leicester) Limited | Wholesale & retail | 2003 |
| Parvabrook Homes Ltd | Real estate | 2020 |
| Pasture Lane Stores Limited | Wholesale & retail | 2003 |
| Patel (HGV) Chauffeur Services Limited | Transport & logistics | 1999 |
| Patel Construction Ltd | Construction | 2004 |
| Paul Beech and Company Ltd | Professional & scientific | 2004 |
| Paul Mckim Consulting Limited | Professional & scientific | 2002 |
| Paul Wells Commercial and Domestic Flooring Limited | Construction | 2005 |
| Payne and Bond Limited | Wholesale & retail | 1990 |
| Paynes Vehicle Contracts Limited | Professional & scientific | 1964 |
| PDL I.T. Solutions Limited | Information & communication | 2006 |
| Pegaso (UK) Limited | Wholesale & retail | 2002 |
| Pegasus Displays Limited | Manufacturing | 1994 |
| Perfect Polymer Systems Limited | Manufacturing | 1994 |
| Period Properties (Enderby) Limited | Real estate | 1999 |
| Pet Deli Limited | Wholesale & retail | 2005 |
| Peter Cross (Motors) Limited | Real estate | 1944 |
| Peter J Smith Limited | Wholesale & retail | 2000 |
| PFB Contracting Ltd | Energy | 2006 |
| Pharma Trial Limited | Health & social care | 2002 |
| Photocentre Limited | Professional & scientific | 2005 |
| Pickup & SON Ltd | Transport & logistics | 1997 |
| Piercetown Developments Limited | Real estate | 2001 |
| PKN Solutions Limited | Information & communication | 2007 |
| Placek Blue Mountain Rentals Ltd | Real estate | 2024 |
| Planters (Leicester) Limited | Construction | 1983 |
| Plants, Plants, Plants Limited | Wholesale & retail | 1999 |
| Plate Perfection Limited | Wholesale & retail | 2018 |
| PLM Essentials Limited | Information & communication | 2019 |
| Plutonium Consulting Ltd | Education | 2005 |
| Poise Group Limited | Professional & scientific | 2003 |
| Pollys (Leicester) Limited | Wholesale & retail | 2003 |
| Port ST George Investments Limited | Real estate | 2006 |
| Porter Property (UK) Ltd | Real estate | 2004 |
| Positive Source Limited | Administrative & support | 2018 |
| Positron Limited | Extraterritorial | 1997 |
| Poundstretcher Leicester Limited | Wholesale & retail | 2002 |
| Poundstretcher Limited | Wholesale & retail | 1955 |
| PP Advertising Limited | Professional & scientific | 2023 |
| Precision Fencing Limited | Construction | 1997 |
| Preeyash Limited | Real estate | 2002 |
| Premclean Limited | Administrative & support | 2005 |
| Premier Plastering (UK) Limited | Construction | 2002 |
| Prescientia Limited | Professional & scientific | 1998 |
| Pressing Appointments Limited | Other services | 2003 |
| Prestige Cleaning Contractors Ltd | Administrative & support | 2004 |
| Prihoda UK Ltd | Professional & scientific | 2009 |
| Prime Bricks Limited | Real estate | 2003 |
| Prime Casual Limited | Manufacturing | 2004 |
| Prime Homes Limited | Real estate | 2000 |
| Prlm Asset Management Ltd | Financial services | 2025 |
| Proactive I.T. Limited | Information & communication | 1997 |
| Professional 2U Limited | Professional & scientific | 2002 |
| Proffitt Consultants Limited | Professional & scientific | 2005 |
| Profiles Estate Agents Limited | Real estate | 1998 |
| Progressive Dog Company Limited | Agriculture & fishing | 2017 |
| Project Metrology Limited | Manufacturing | 1994 |
| Project Technologies (UK) Limited | Professional & scientific | 1997 |
| Proludic Limited | Construction | 2002 |
| Promethean Human Designs Ltd | Professional & scientific | 2026 |
| Promotional Solutions UK Limited | Administrative & support | 2003 |
| Property Management (ST. Maur) Limited | Administrative & support | 2002 |
| Prophets (Gerrards Cross) Limited | Wholesale & retail | 1987 |
| Propraxis Limited | Information & communication | 2007 |
| Prosol Enterprises LLP | | 2013 |
| Protheroe Motor Group Limited (the) | Wholesale & retail | 1970 |
| PS Imports Limited | Extraterritorial | 2018 |
| Psychability Limited | Health & social care | 2003 |
| Psyworks Limited | Administrative & support | 2003 |
| Publishing House International Ltd | Information & communication | 2022 |
| Pugh & SON (Market Harborough) Limited | Wholesale & retail | 2003 |
| Pukka Tukka Limited | Extraterritorial | 1986 |
| Purrbright Ltd | Wholesale & retail | 2003 |
| QE Global Limited | Wholesale & retail | 2007 |