| Orchard Priory Limited | Administrative & support | 2007 |
| Orcus Griffin Limited | Professional & scientific | 2008 |
| Oriac Information Systems Limited | Information & communication | 1995 |
| Origin Field Limited | Professional & scientific | 2026 |
| Original Folk Ltd | Wholesale & retail | 2025 |
| ORQ International Limited | Information & communication | 2016 |
| Ortum Products Limited | Manufacturing | 2019 |
| Osborne Property Developments Limited | Construction | 2021 |
| OT Southeast Limited | Health & social care | 2014 |
| Otamats Properties England Ltd | Real estate | 2026 |
| Otamats Properties Ltd | Real estate | 2019 |
| OTB (Hythe) Group Limited | Construction | 2024 |
| OTB (Hythe) Holdings Limited | Construction | 2024 |
| OTC Supplies Limited | Wholesale & retail | 2025 |
| Otium Services UK Ltd | Other services | 2023 |
| Otterpool Park Development Company Ltd | Extraterritorial | 2019 |
| Otterpool Taxis Ltd | Transport & logistics | 2023 |
| Oval Contractors Limited | Construction | 2015 |
| Ovenden & Co Property Services Ltd | Real estate | 2025 |
| Overseas Trading Consultants Limited | Professional & scientific | 2002 |
| Overton Jmarc Property Investment Limited | Real estate | 2021 |
| Oviedo Group Limited | Professional & scientific | 2022 |
| Owenmartinrail Ltd | Professional & scientific | 2020 |
| OX Theatre Company Ltd | Arts & recreation | 2022 |
| Oxford Racing Ltd | Manufacturing | 2025 |
| P & K Property Developments Limited | Construction | 2024 |
| P G Diesel Power Limited | Wholesale & retail | 2013 |
| P J Smith (Electrical) Limited | Construction | 2026 |
| P Larsen Consultancy Limited | Arts & recreation | 2023 |
| P&T Property Management Limited | Real estate | 2026 |
| P.Browne Rail Ltd | Construction | 2016 |
| P.G. Airconditioning Ltd | Construction | 2003 |
| P.R. Consultants (Europe) Limited | Professional & scientific | 2000 |
| P3C Limited | Professional & scientific | 2019 |
| Pabro Performance Films Limited | Professional & scientific | 1998 |
| PAG Welding Ltd | Construction | 2015 |
| Page Computer Support Limited | Information & communication | 1991 |
| Pageant Cockreed Ltd | Real estate | 2018 |
| Paint and Place Ltd | Professional & scientific | 2025 |
| Paint POP Limited | Arts & recreation | 2005 |
| Paklyn Ltd | Financial services | 2024 |
| Paper & Polythene Direct Ltd | Wholesale & retail | 2024 |
| Paradigm Safety Limited | Wholesale & retail | 2025 |
| Paraling Limited | Information & communication | 2007 |
| Park Farm Civils Limited | Construction | 2024 |
| Park Farm Construction Limited | Extraterritorial | 2022 |
| Park Inn Hotel Limited | Hospitality | 2022 |
| Parker Electrical Kent Ltd | Construction | 2023 |
| Parker Rail Limited | Other services | 2017 |
| Parlee Consulting Limited | Professional & scientific | 2018 |
| Partnership Working Team Ltd | Education | 2011 |
| Pathfinder Property Management Limited | Real estate | 2004 |
| Patternworks Ltd | Information & communication | 2025 |
| Pavilion Batteries Limited | Wholesale & retail | 2015 |
| Pavilion Court Limited | Households | 1980 |
| Pavilion Court RTM Company Limited | Households | 2008 |
| Pavilion Folkestone Ltd | Other services | 2018 |
| Pavilion Property Maintenance Ltd | Construction | 2021 |
| Paws & Connect CIC | Education | 2023 |
| Paws 4 U Ltd | Professional & scientific | 2018 |
| Pazoot Ltd | Information & communication | 2024 |
| Pblossoms Healthcare Services Ltd | Administrative & support | 2022 |
| PBU Holdings Limited | Information & communication | 2016 |
| PD GAS Services Limited | Construction | 2019 |
| PD Repairz Ltd | Other services | 2024 |
| Peachey Fashions Ltd | Extraterritorial | 2012 |
| Pearce Sounds & Services Ltd | Administrative & support | 2024 |
| Pearls Real Estate Limited | Real estate | 2023 |
| Peerpod Ltd | Education | 2023 |
| Pegu Media Limited | Professional & scientific | 2016 |
| Peirianneg Limited | Professional & scientific | 2023 |
| PEK on the Go Ltd | Hospitality | 2022 |
| Peking 888 Ltd | Hospitality | 2023 |
| Pentland (Kingsnorth) Limited | Real estate | 2025 |
| Pentland Homes (Holdings) Limited | Construction | 2007 |
| Pentland Homes Limited | Construction | 1971 |
| Pentland Properties Limited | Construction | 2007 |
| People Works Hub Limited | Administrative & support | 2017 |
| Pepc Holdings Limited | Real estate | 2019 |
| Pepperland Nurseries Ltd | Construction | 2017 |
| Percussion Group Limited | Professional & scientific | 2022 |
| Perfect Market Ltd | Wholesale & retail | 2020 |
| Permaset UK PTY Limited | Wholesale & retail | 2008 |
| Pet and People Transport Ltd | Transport & logistics | 2022 |
| Pet Certification Ltd | Professional & scientific | 2024 |
| Pet Taxi Abroad Limited | Transport & logistics | 2025 |
| Pet Taxi Express Ltd | Transport & logistics | 2023 |
| Pet Transportation Ltd | Transport & logistics | 2025 |
| Peter Robinson Communications Ltd | Professional & scientific | 2014 |
| Peter South Associates Ltd | Professional & scientific | 2011 |
| Peter Wells Consultants Ltd | Construction | 2020 |
| Petley Developments Ltd | Real estate | 2022 |
| Pets Travel Europe to UK Limited | Transport & logistics | 2023 |
| Pettaxiparistouk.Co.Uk Ltd | Transport & logistics | 2026 |
| PGD Doors Limited | Construction | 2018 |
| PGS Telecom Limited | Information & communication | 2012 |
| Phair Designs Limited | Information & communication | 2013 |
| Phelco Limited | Construction | 2017 |
| Philatelic Print Buyer UK Limited | Administrative & support | 2012 |
| Philip Alan Interiors Limited | Professional & scientific | 2015 |