| Old Harrier Close Management Limited | Households | 2010 |
| Oliver Consultancy Limited | Professional & scientific | 2009 |
| Oliver's of London Limited | Manufacturing | 2014 |
| One Broad Street Limited | Hospitality | 2017 |
| Optimus Mortgages (Sussex) Ltd | Financial services | 2025 |
| Orbnet Systems Ltd | Information & communication | 2019 |
| Orchard by Bridges Ltd | Real estate | 2023 |
| Orchard Regional Lettings Limited | Real estate | 2014 |
| Orchard Sales (Camberley) LLP | | 2013 |
| Ortho DUO Holdings Limited | Financial services | 2024 |
| Ortho DUO Limited | Health & social care | 2020 |
| Orthopaedic Specialist Partnership LLP | | 2018 |
| OS Clinic Limited | Financial services | 2024 |
| OS Connect Limited | Health & social care | 2023 |
| OS Corporate Holdings Ltd | Financial services | 2024 |
| OS Practice Services Ltd | Health & social care | 2025 |
| OSM Sales and Marketing Ltd | Professional & scientific | 2015 |
| Oxley Construction Ltd | Construction | 2025 |
| P B Auto Services Limited | Wholesale & retail | 2007 |
| P J Adams Developments Limited | Construction | 2002 |
| P J Adams Earthworks Limited | Administrative & support | 2017 |
| Pabugi Ltd. | Professional & scientific | 2000 |
| Pace Pubs Hastings Ltd | Hospitality | 2025 |
| Pace Pubs Ltd | Hospitality | 2024 |
| Page Robson Limited | Construction | 2003 |
| Palco Properties Limited | Construction | 1966 |
| Palco Properties Management Limited | Real estate | 2019 |
| Park Investments London LLP | | 2021 |
| Parking 40 Church Road Limited | Transport & logistics | 2016 |
| Parkrock Consulting Limited | Information & communication | 2005 |
| Parthenon Home Management Company Limited | Real estate | 1986 |
| Pass Family Partnership LLP | | 2017 |
| Paul a Barber LLP | | 2018 |
| Paul Thomason Limited | Real estate | 2025 |
| Pava Facilities Limited | Professional & scientific | 2016 |
| Pavol Zajac Structural Engineers Limited | Wholesale & retail | 2019 |
| Pawprint Publishing Limited | Information & communication | 2008 |
| PE & EE Property Limited | Other services | 2015 |
| Peneva Ltd | Real estate | 2025 |
| Penns Holding Ltd | Financial services | 2023 |
| Performance Psychotherapy Limited | Health & social care | 2025 |
| Peter Charles Limited | Professional & scientific | 1998 |
| Peter Wagg Limited | Wholesale & retail | 1991 |
| Pevensey Bay Car Centre Limited | Wholesale & retail | 2002 |
| PFB Property Investments Limited | Real estate | 2018 |
| PFB Property Services Limited | Construction | 2014 |
| Phantasma Limited | Real estate | 2021 |
| Philip Oakley Design Ltd | Professional & scientific | 2012 |
| Phillimore Family Partnership Limited | Wholesale & retail | 2002 |
| Pillai Property Management LLP | | 2023 |
| Pink Icing Company Academy Limited | Education | 2014 |
| Pink Icing Company Limited | Wholesale & retail | 2010 |
| Pinmer Holdings Limited | Real estate | 2025 |
| Pinmer Management Consultancy LLP | | 2025 |
| Pissarro's Hastings Limited | Hospitality | 2011 |
| Pixie Enterprises Ltd | Arts & recreation | 2025 |
| PJD Assets Property Management LLP | | 2022 |
| Ploughplan Properties Limited | Real estate | 1981 |
| PMC Carpentry Limited | Construction | 2002 |
| PMC Rentals Limited | Real estate | 2006 |
| Polaris Clinical Research Ltd | Professional & scientific | 2021 |
| Pollskin Enterprises LLP | | 2021 |
| Prada Properties Limited | Real estate | 2007 |
| Precision Graphics & Wraps Ltd | Wholesale & retail | 2024 |
| Pro-Check Ltd | Professional & scientific | 2023 |
| Project Management Ninfield Limited | Extraterritorial | 2014 |
| Properties Champion Ltd | Real estate | 2019 |
| Property Sherpas Ltd | Real estate | 2019 |
| Pukeko Partners LLP | | 2018 |
| Pump House Estates (SE) Ltd | Construction | 2018 |
| Pure Choice Partnership Limited | Professional & scientific | 2019 |
| PYE Investments Limited | Real estate | 2013 |
| Pyrolite Investments Ltd | Real estate | 2020 |
| Q Architecture LLP | | 2013 |
| QR Empire Investments Ltd | Real estate | 2020 |
| QR Empire LLP | | 2019 |
| Qualiturn Limited | Professional & scientific | 2003 |
| Quantum and AI Technologies Limited | Professional & scientific | 2003 |
| Quartet Architecture Ltd | Professional & scientific | 2010 |
| Quinta Suites UK Limited | Real estate | 2004 |
| R & S O'Hanlon Limited | Real estate | 2004 |
| R. T. Sullivan Consulting Limited | Information & communication | 2010 |
| Radchem Ltd | Professional & scientific | 2023 |
| Radcliffe Property Limited | Real estate | 2020 |
| Radia Investments LLP | | 2023 |
| Radiator Arts | Arts & recreation | 2002 |
| Radpharm Limited | Wholesale & retail | 1986 |
| Radpharm Management Limited | Professional & scientific | 2008 |
| Rainbow Rock Invest Limited | Extraterritorial | 2015 |
| RAM Rider Ltd | Wholesale & retail | 2020 |
| Ranson Property Holdings Ltd | Real estate | 2024 |
| Ranson Property Limited | Real estate | 2015 |
| Ranson Property Management LLP | | 2019 |
| RBE Trampolines Limited | Arts & recreation | 2012 |
| RCP Estates Limited | Real estate | 2015 |
| RCP Estates Partnership LLP | | 2025 |
| Reachx Limited | Professional & scientific | 2017 |
| Real Estate Ventures Limited | Hospitality | 2011 |
| Red Door Residential LLP | | 2017 |
| Red Hair Franchising Ltd | Other services | 2012 |