| Optima Consulting and Investment Limited | Professional & scientific | 2024 |
| Orators Inc | | 2024 |
| Orchard Villas Management Company Limited | Hospitality | 1990 |
| Oriental Express Dover Limited | Hospitality | 2023 |
| Orijinel OD Ltd | Information & communication | 2019 |
| Oscar Brands, Inc. | | 2023 |
| Osteopathy & Well-Being @ CT6 Ltd | Health & social care | 2012 |
| OUR Journey Online Ltd | Information & communication | 2025 |
| OUT the Box Theatre Company CIC | Arts & recreation | 2023 |
| Overcray Limited | Construction | 2023 |
| Owen Civil Engineering Limited | Administrative & support | 2014 |
| OWL Music Ltd | Education | 2019 |
| Owsy, LLC | | 2021 |
| Oxiz Studio Invest Ltd | Extraterritorial | 2026 |
| Oxiz Studio Ltd | Extraterritorial | 2026 |
| OYA & Sons Ltd | Real estate | 2022 |
| P and R Divine Properties Ltd | Real estate | 2021 |
| P J Cullen Carpentry and General Construction Limited | Manufacturing | 2026 |
| P J Edwards Haulage Limited | Transport & logistics | 2001 |
| P L Properties Kent Ltd | Real estate | 2021 |
| P M Marine Support Limited | Manufacturing | 2019 |
| P S Aviation Limited | Administrative & support | 2013 |
| P.Co.B Ltd | Extraterritorial | 2010 |
| P2P Group PLC | Extraterritorial | 2024 |
| Pacesetter Racing Ltd | Arts & recreation | 2025 |
| Pacific Ocean (Dover) Ltd | Wholesale & retail | 2011 |
| Palamon Capital Partners, Ltd | | 1998 |
| Palas Enterprises Limited | Real estate | 2022 |
| Paleopal Limited | Hospitality | 1988 |
| Pamela and Priscilla Ltd | Arts & recreation | 2024 |
| Parah Investments Ltd | Wholesale & retail | 2025 |
| Park Inn Palace Ltd | Hospitality | 2025 |
| Part Tech Ltd | Wholesale & retail | 2018 |
| Partexecom Ltd | Wholesale & retail | 2024 |
| PAT Coshh Limited | Professional & scientific | 2002 |
| PAT Coshh Maintenance & Production Services Limited | Manufacturing | 1993 |
| PAT Coshh Services Limited | Other services | 2002 |
| Patels PUB Ltd | Hospitality | 2025 |
| Paul Murphy Lighting Limited | Information & communication | 2015 |
| Paveley PUB Management Limited | Hospitality | 2020 |
| Pavelka Limited | Other services | 2013 |
| Pawley Services Ltd | Information & communication | 2014 |
| Payne Groundworks & Civils Ltd | Construction | 2022 |
| Payzing Holdings Ltd | Construction | 2025 |
| Payzing Ltd | Construction | 2022 |
| Payzing Services Ltd | Administrative & support | 2023 |
| PCM Consultancy Services Ltd | Professional & scientific | 2026 |
| Pcml Consultants Limited | Professional & scientific | 2015 |
| PDC Building & Groundworks Limited | Construction | 2019 |
| Pear BIO | | 2019 |
| Pearson Jackson Construction Ltd | Construction | 2026 |
| Pebbles Community Facilities C.I.C. | Wholesale & retail | 2013 |
| Penelope Ltd | Professional & scientific | 2017 |
| Penthouse Dreams Ltd | Real estate | 2022 |
| Pentonvale Limited | Construction | 2017 |
| People Processes and Solutions Limited | Professional & scientific | 2002 |
| Pest Exterminator Ltd | Administrative & support | 2024 |
| Petruta Cristina Cleaning Limited | Manufacturing | 2020 |
| Pharmaethical (Kent) Ltd | Wholesale & retail | 2024 |
| Pharmaethical Ltd | Wholesale & retail | 2018 |
| Phenomenail a Glaz Ltd | Other services | 2023 |
| Phil Hyde Transport UK Ltd | Transport & logistics | 2026 |
| Philabox Stamp Company Limited | Wholesale & retail | 2022 |
| Phillip Edwards Hairdressing Limited | Other services | 2014 |
| Phoenix 63 Limited | Other services | 2019 |
| Phoenix K9 Services Limited | Administrative & support | 2019 |
| Phoenix Restoration Ltd | Construction | 2024 |
| Pied a MER Limited | Real estate | 2015 |
| Pied Piper Educational Resources Limited | Education | 2001 |
| Pilatesmed Limited | Other services | 2024 |
| Pilgrims Cottages Management Company Ltd | Households | 2026 |
| Pinebourne Ltd | Professional & scientific | 2011 |
| Pinnacle Energy Solutions Ltd | Construction | 2026 |
| Piper Trading Limited | Professional & scientific | 2016 |
| Pipeworks Mechanical Services (South East) Limited | Construction | 2008 |
| PJ Shipping Limited | Administrative & support | 1999 |
| PJB Vehicle Services Ltd | Wholesale & retail | 2018 |
| PJC Electrical Limited | Construction | 2002 |
| PJH Civils Ltd | Other services | 2022 |
| PJS Farms Ltd | Agriculture & fishing | 2018 |
| PKA & Partners Investment Limited | Construction | 2025 |
| PKS International Logistics Limited | Transport & logistics | 2026 |
| Plusion Location Invest Ltd | Extraterritorial | 2023 |
| PMH Marine Ltd | Professional & scientific | 2025 |
| Podplus Limited | Wholesale & retail | 2004 |
| POL Innovation CIC | Hospitality | 2024 |
| Polaris Pools Limited | Arts & recreation | 2012 |
| Polblast Limited | Administrative & support | 2024 |
| Polymer Records Limited | Extraterritorial | 2021 |
| Pooky PYE Limited | Manufacturing | 2022 |
| Port Clearance Solutions Limited | Transport & logistics | 2010 |
| Port of Dover Cargo Limited | Transport & logistics | 2016 |
| Port of Dover Limited | Transport & logistics | 2009 |
| Portery Management Company Limited(The) | Professional & scientific | 1982 |
| Portland & Partners Ltd | Real estate | 2021 |
| Portland Green Estates Limited | Real estate | 2025 |
| Portland Plastering Services Ltd | Construction | 2024 |
| Positive View Foundation | Professional & scientific | 2011 |
| Positively Property Ltd | Real estate | 2006 |
| Potter & Green Limited | Construction | 2019 |