| Oyster Mutual Properties Limited | Administrative & support | 2007 |
| Ozilite Care Recruitment Ltd | Administrative & support | 2020 |
| Ozoglu Limited | Wholesale & retail | 2024 |
| P & a Carpentry Ltd | Construction | 2002 |
| P & G Fabrications (Essex) Limited | Manufacturing | 1988 |
| P & H Body Repairs Limited | Wholesale & retail | 2003 |
| P & J Tyre Services Limited | Wholesale & retail | 1980 |
| P & R Contractors Limited | Construction | 2000 |
| P & S Chem Ltd | Health & social care | 1998 |
| P & S Estates Limited | Real estate | 2001 |
| P & T Food Supplies Limited | Wholesale & retail | 2017 |
| P & T Tyrer Ltd | Wholesale & retail | 2002 |
| P & V Electrical Ltd | Construction | 2013 |
| P a K Services Ltd | Construction | 2003 |
| P a Rushton Limited | Professional & scientific | 2006 |
| P C Groundworks Limited | Construction | 2007 |
| P C Modelling Limited | Manufacturing | 2004 |
| P D B Building Services Ltd | Construction | 2004 |
| P D Merron Building Contractors Ltd | Construction | 2006 |
| P F B Services Limited | Professional & scientific | 2006 |
| P G Ratcliff Farms Limited | Agriculture & fishing | 2008 |
| P Halliday Limited | Construction | 2003 |
| P J First AID Training Limited | Health & social care | 2004 |
| P J Frost Limited | Information & communication | 1994 |
| P Knight Construction Limited | Construction | 2003 |
| P L H Management Limited | Hospitality | 1998 |
| P L S Solutions Limited | Information & communication | 2003 |
| P P I Investments Limited | Real estate | 1997 |
| P R Haulage Limited | Transport & logistics | 2005 |
| P R W Surveys Limited | Construction | 1999 |
| P T S Golf Limited | Wholesale & retail | 2007 |
| P Woulfe and SON Holdings Limited | Professional & scientific | 2007 |
| P&B Ilford Ltd | Hospitality | 2021 |
| P&J Hobby Consultancy Ltd | Information & communication | 2020 |
| P. & M. Enterprises Limited | Other services | 1980 |
| P. G. Ashton & Sons (Surveyors) Limited | Professional & scientific | 1994 |
| P. R. Baker & Sons Limited | Construction | 2003 |
| P.A. Roofing UK Limited | Construction | 2006 |
| P.A. Summers Agricultural Machinery Limited | Wholesale & retail | 1984 |
| P.A. Summers Limited | Wholesale & retail | 1986 |
| P.E. Secretarial Services Limited | Administrative & support | 1998 |
| P.F. Humphreys (Dental Laboratories) Limited | Health & social care | 1950 |
| P.L.A. (Metropolitan Terminals) Limited | | 1965 |
| P.R. Turner (Building Contractors) Limited | Construction | 1985 |
| P.T.L. Accountancy Services Limited | Professional & scientific | 2005 |
| P4L Enterprise Limited | Wholesale & retail | 2025 |
| Pablotec Ltd | Transport & logistics | 2003 |
| Pace Rail Ltd | Professional & scientific | 2015 |
| Pacilantic International Ltd. | Information & communication | 1993 |
| Pack Audits Limited | Professional & scientific | 2011 |
| Pack N Wraps Limited | Wholesale & retail | 2020 |
| Packbrik Ltd | Wholesale & retail | 2024 |
| Packspeed Ltd | Professional & scientific | 2006 |
| Padel Force Club Ltd | Arts & recreation | 2025 |
| PAGE360 Consulting Ltd | Professional & scientific | 2013 |
| PAK Cosmetic Centre Limited | Extraterritorial | 1999 |
| Pala Catering Ltd | Hospitality | 2024 |
| Pale Blue Consulting Limited | Information & communication | 2007 |
| PAM Nehi Ltd | Health & social care | 2020 |
| Pampanos Trustees Limited | Administrative & support | 2007 |
| PAN Flooring Limited | Wholesale & retail | 2006 |
| Panbrook Enterprises Limited | Real estate | 2001 |
| Panelworx Limited | Manufacturing | 2006 |
| Panescu Viorel Ltd | Transport & logistics | 2019 |
| Papa Pincus Productions Limited | Information & communication | 2025 |
| Papa Snacks Limited | Wholesale & retail | 2020 |
| Papeluxe Ltd | Wholesale & retail | 2025 |
| Paperwonder Ltd | Wholesale & retail | 2025 |
| Papi Transport (UK) Limited | Transport & logistics | 1985 |
| Papushi Limited | Real estate | 2021 |
| Paragon Products & Services Limited | Construction | 1997 |
| Paramount Educators Ltd | Education | 2023 |
| Paramount House (Leytonstone) Management Limited | Real estate | 1985 |
| Paramount Supplies Limited | | 1982 |
| Paras R Shah Ltd | Wholesale & retail | 2017 |
| Parcel Movers Ltd | Transport & logistics | 2025 |
| Parent Push Limited | Education | 2026 |
| Parijat Properties Limited | Real estate | 2022 |
| Paris Decor | | 1997 |
| Parispurple Ltd | Health & social care | 2015 |
| Park Promotions (UK) Ltd | Wholesale & retail | 2008 |
| Parkers Garden Company Frinton Limited | Wholesale & retail | 1960 |
| Parkside Nursing Home Limited | Health & social care | 2004 |
| Parmar Shoes Limited | Wholesale & retail | 2002 |
| Parsec Systems Limited | Information & communication | 2007 |
| Parsonage House,Limited | Professional & scientific | 1901 |
| Parsons Electrical Limited | Construction | 2004 |
| Partridge Lodge Management Limited | Real estate | 1991 |
| Parts Hub Ltd | Wholesale & retail | 2025 |
| Partynest Ltd | Wholesale & retail | 2026 |
| Pasha Lounge (Grays) Ltd | Hospitality | 2024 |
| Passive Holdings Limited | Real estate | 2008 |
| Pasture Healthcare Limited | Health & social care | 2025 |
| PAT Inspection & Testing Limited | Construction | 2003 |
| Patchwork IT Ltd | Information & communication | 2015 |
| Patford Flat Management Company Limited | Households | 1979 |
| Pathfinder Automation Limited | Information & communication | 2025 |
| Pathfinder Executive Search Limited | Administrative & support | 2004 |
| Pathimber Limited | Wholesale & retail | 1984 |
| Pathosky Medical Limited | Health & social care | 2025 |