| Orderitdirect Limited | Extraterritorial | 1998 |
| Ordnance Yard Management Company Ltd | Households | 2017 |
| Orekscollections Ltd | Wholesale & retail | 2025 |
| ORG Health Limited | Professional & scientific | 2013 |
| Organisational Health LLP | | 2025 |
| Oriel Landmark Holdings Ltd | Financial services | 2025 |
| Oriel Landmark Property Investments Ltd | Real estate | 2025 |
| Oriel Landmark SPV A01 Ltd | Real estate | 2025 |
| Original Kent Kebab Ltd | Hospitality | 2022 |
| Orthomatic (UK) Limited | Extraterritorial | 2000 |
| Osat Services Ltd | Education | 2024 |
| Osborne Electrics Ltd | Construction | 2023 |
| Oscar Acoustics Limited | Construction | 1992 |
| Oscar Engineering Limited | Construction | 1978 |
| Osqr Limited | Other services | 2012 |
| Otcstclub Ltd | Wholesale & retail | 2026 |
| Otterbear Advisory Ltd | Professional & scientific | 2025 |
| Otto Assets Ltd | Real estate | 2021 |
| OTW Retail Limited | Wholesale & retail | 2026 |
| OUR Tech Ltd | Other services | 2011 |
| OUT the Box Shop Ltd | Wholesale & retail | 2024 |
| Outdoor Swimming Club Ltd | Education | 2024 |
| OUTLAW718 Limited | Wholesale & retail | 2016 |
| Outside Services (South East) Ltd | Construction | 2021 |
| Ovaw Limited | Professional & scientific | 2025 |
| Overthetop Solutions Ltd | Construction | 2025 |
| Ovrnyt Ltd | Wholesale & retail | 2025 |
| OW Freelance Ltd | Professional & scientific | 2025 |
| Owbury Airconditioning Ltd | Energy | 2023 |
| Owen Mullen (Farms) Limited | Agriculture & fishing | 1989 |
| OWL Design Limited | Professional & scientific | 2014 |
| Oxden Floors Limited | Construction | 1985 |
| Oyieko Limited | Health & social care | 2021 |
| OZIE-T2 Logistics Limited | Transport & logistics | 2023 |
| Ozone Mechanical Ltd | Construction | 2024 |
| Ozpole UK Ltd | Hospitality | 2017 |
| P & W Nash (Property) Limited | Real estate | 1972 |
| P D Johnson Farms Limited | Agriculture & fishing | 2009 |
| P J a (South East) Ltd | Construction | 2026 |
| P Jarvis Limited | Manufacturing | 2008 |
| P K Produce Limited | Wholesale & retail | 2004 |
| P Probets Limited | Construction | 2018 |
| P R C Decorating Ltd. | Construction | 2013 |
| P R S Carpentry Services Limited | Construction | 2004 |
| P S K Property Services UK Limited | Real estate | 2023 |
| P&A Asset Management Ltd | Real estate | 2025 |
| P&J Property Ltd | Real estate | 2020 |
| P&N Home Maintenance Limited | Construction | 2015 |
| P&P Security UK Ltd | Administrative & support | 2019 |
| P.& H.Mobile Services Limited | Other services | 1959 |
| P.Foley Construction Ltd | Construction | 2022 |
| PA & MP Holdings UK Ltd | Financial services | 2022 |
| PA Consulting & Acquisitions Limited | Wholesale & retail | 2026 |
| Pace Consultant Services Ltd | Wholesale & retail | 2024 |
| Packman Lucas Associates Ltd. | Professional & scientific | 2012 |
| Paddock Solutions Ltd | Real estate | 2017 |
| Paddock Wood Self Storage Kent Ltd | Administrative & support | 2026 |
| Paddock Wood Self Storage Ltd | Real estate | 2024 |
| Paktech Limited | Manufacturing | 1997 |
| Palace Hotel Limited | Hospitality | 2015 |
| Palm Developments Limited | Real estate | 1995 |
| Palm Estates Limited | Real estate | 1987 |
| Palm Investments Limited | Real estate | 1986 |
| Palm Securities Limited | Financial services | 2026 |
| Palm Securities OG Limited | Real estate | 1987 |
| PAM IT Services Ltd | Information & communication | 2024 |
| Panasia Group Limited | Hospitality | 2025 |
| Panda (Kent) Ltd | Real estate | 2025 |
| Pankhurst Contracting Limited | Construction | 2016 |
| Pankhurst Holdings Limited | Financial services | 2025 |
| Pankhurst Services Ltd | Transport & logistics | 2018 |
| Pantera Carpentry (South East) Limited | Construction | 2006 |
| Pantera Group Holdings Limited | Financial services | 2023 |
| Pantera Group Limited | Financial services | 2015 |
| Pantera Wardrobes Limited | Construction | 2015 |
| Papad's Ltd | Hospitality | 2023 |
| Paprika Lounge Ltd | Hospitality | 2017 |
| PAR Mechanical Services Limited | Construction | 2010 |
| Paradise Living Ltd | Real estate | 2020 |
| Paragon Drones Ltd | Professional & scientific | 2020 |
| Paramount Independent Property Services LLP | | 2014 |
| Paramount Land and Development (Sheppey Court) Limited | Construction | 2018 |
| Paramount Land UK Limited | Construction | 2019 |
| Parcel Giant Worldwide Ltd | Transport & logistics | 2014 |
| Parenta Group Limited | Information & communication | 2004 |
| Parenta Holdings Ltd | Professional & scientific | 2009 |
| Parenta Limited | Administrative & support | 1999 |
| Parenta Partners LLP | | 2016 |
| Parenta Training Limited | Education | 2006 |
| Parenta Trust | Education | 2013 |
| Parkcentral Developments Ltd | Construction | 2018 |
| Parker Building Services (South East) Ltd | Construction | 2017 |
| Parker International Holdings Ltd | Financial services | 2017 |
| Parkie Properties and Care Services UK Ltd | Real estate | 2022 |
| Parkside Developments Kent Ltd | Construction | 2018 |
| Parry Healthcare Limited | Health & social care | 2022 |
| PAS Property Management Limited | Real estate | 2017 |
| PAS Residential Limited | Real estate | 2017 |
| Passion Ventures Limited | Hospitality | 2012 |
| Passmores Portable Buildings (Holdings) Limited | Professional & scientific | 2000 |