| Optimum Security & Electrical Solutions Limited | Administrative & support | 2018 |
| Orbital Talent Limited | Administrative & support | 2023 |
| Organic Touch Catering Services Limited | Hospitality | 2025 |
| Original 21ST Century Dinosaur TM Ltd | Other services | 2009 |
| Original Lyrics Limited | Information & communication | 2016 |
| Orpen Furneaux Limited | Real estate | 2018 |
| Osbi Electrical Services Ltd | Construction | 2025 |
| Osca Digital Limited | Professional & scientific | 2016 |
| Oscar & Hunt Ltd | Real estate | 2008 |
| Ostro Capital Management Ltd | Financial services | 2010 |
| OT Controls Ltd | Professional & scientific | 2019 |
| Outatime Films Ltd | Information & communication | 2018 |
| Outstanding Marble & Granite Ltd | Manufacturing | 2022 |
| Owenjohn Limited | Professional & scientific | 2015 |
| Oxford Unwrapped Limited | Arts & recreation | 2021 |
| Ozee UK Limited | Manufacturing | 2010 |
| P a Peters Limited | Real estate | 2018 |
| P H Ground Rent Investments Limited | Real estate | 2016 |
| P H Property Assets Limited | Real estate | 2015 |
| P Illingworth Utilities Limited | Energy | 2018 |
| P R Harris (Developments) Limited | Construction | 2015 |
| P. Breading Motor Services Limited | Wholesale & retail | 2008 |
| P. E. M. Roofing Limited | Construction | 2014 |
| P.C. Tiling of Essex Ltd | Construction | 2018 |
| P.C. Wright Electrical Limited | Construction | 2005 |
| P.L. Taylor Electrical Services Limited | Construction | 1996 |
| PA Box Ltd | Administrative & support | 2024 |
| PA Security Installations Ltd | Administrative & support | 2018 |
| Pabari & Company (PP) Limited | Professional & scientific | 2024 |
| Pace Training & Technical Consultancy Limited | Professional & scientific | 2017 |
| Pace Youth Arts C.I.C. | Arts & recreation | 2023 |
| Packiyammah Investment Properties Ltd | Real estate | 2023 |
| Paerobic Ltd | Health & social care | 2023 |
| Paige & Kennedy Mortgage Services Limited | Financial services | 2015 |
| Paige and Kennedy Financial Services Limited | Professional & scientific | 2025 |
| Paint Smart 501 Ltd | Construction | 2023 |
| Painted London Limited | Construction | 2015 |
| Pall Mall Properties(Leigh on Sea) Limited | Real estate | 2023 |
| Palm Fencing Limited | Construction | 2005 |
| Paneltec Services Limited | Construction | 1998 |
| PAP Care Services Ltd | Health & social care | 2022 |
| Paradise Beauty Ltd | Other services | 2023 |
| Paramount Connect Ltd | Information & communication | 2018 |
| Parcep Foundation | Information & communication | 2026 |
| Pargrand Limited | Hospitality | 1979 |
| Park Lane Plumbing & Heating Ltd | Construction | 2018 |
| Park Nail Studios Limited | Other services | 2009 |
| Park Road Management Company Limited | Real estate | 2002 |
| Parker Conveyancing Services Limited | Real estate | 2025 |
| Parkstone Services Limited | Manufacturing | 2015 |
| Parlax Ltd | Hospitality | 2023 |
| Parties & Signs Ltd | Manufacturing | 2018 |
| Partnered Heating Limited | Construction | 2026 |
| Party Central Ltd | Arts & recreation | 2024 |
| Paterson Harding Group Limited | Real estate | 2015 |
| Paul Holder Writer Ltd | Arts & recreation | 2017 |
| Paulmart Property Limited | Professional & scientific | 2015 |
| Pavement POP UP Ltd | Wholesale & retail | 2025 |
| Pavot Blue Ltd | Wholesale & retail | 2023 |
| PAW Fabulous Limited | Administrative & support | 2024 |
| PAY ‘N’ Spray Ltd | Wholesale & retail | 2024 |
| Payments Simplified Ltd | Information & communication | 2024 |
| PBO2ACT Film Production Company Limited | Arts & recreation | 2021 |
| PCL Technology Holdings Ltd | Real estate | 2018 |
| PCL Technology Ltd | Information & communication | 2010 |
| Pcvc Investments Limited | Real estate | 2022 |
| PDK Contracts Limited | Construction | 2024 |
| PDT Services (Essex) Limited | Construction | 2026 |
| Peacegrace Limited | Real estate | 2025 |
| Peachy Management Ltd | Professional & scientific | 2022 |
| Peachy Productions Ltd | Professional & scientific | 2024 |
| Peachy Religion Ltd | Professional & scientific | 2021 |
| Peakbase Support and Care Ltd | Administrative & support | 2022 |
| Peardrop Property Management Limited | Real estate | 2019 |
| Pearl Automotive Holdings Limited | Wholesale & retail | 2007 |
| Pearl Automotive Trustee Limited | Financial services | 2024 |
| Pearl M & E Management Ltd | Construction | 2023 |
| Pearl Manufacturing Company Limited | Wholesale & retail | 1981 |
| Pearl Products Holdings Limited | Wholesale & retail | 1991 |
| Pearl Sport Limited | Wholesale & retail | 2002 |
| Pearls Clothing and Accessories Limited | Wholesale & retail | 2020 |
| Pearlygirl Ltd | Professional & scientific | 2026 |
| Pearshape Consultancy Limited | Information & communication | 2015 |
| Pearson Engineering U.K. Ltd | Administrative & support | 2003 |
| Pebl Education Ltd | Administrative & support | 2025 |
| Pedu Fixing Ltd | Construction | 2014 |
| Pelham Express Limited | Wholesale & retail | 2021 |
| Penn Sports Limited | Wholesale & retail | 1991 |
| Penny Jane Mortgages Limited | Financial services | 2021 |
| Pensions Clubs Limited | Other services | 2021 |
| Pentagon Construction Services Ltd | Construction | 2018 |
| People by Design Ltd | Administrative & support | 2026 |
| Perfect Storm (London) Ltd | Professional & scientific | 2024 |
| Perfectly Simple IT Solutions Ltd | Professional & scientific | 2006 |
| Performa Drywall Consultants Ltd | Construction | 2018 |
| Performance & Prestige Vehicle Solutions Limited | Wholesale & retail | 2020 |
| Permanent Make UP Specialists Limited | Other services | 2009 |
| Perrin Electrical Limited | Other services | 2002 |
| Persian Consulting Limited | Professional & scientific | 2021 |
| Pesky KID Limited | Other services | 2015 |