| Oxford Periop Limited | Administrative & support | 2019 |
| Oxford Prestige College Ltd | Education | 2011 |
| Oxted MED Limited | Hospitality | 2025 |
| Oyster Consulting Services Limited | Real estate | 2016 |
| Oz's Barber Limited | Other services | 2025 |
| Ozkan Enterprises Limited | Other services | 2011 |
| P & M Realty Limited | Administrative & support | 2001 |
| P Bouloux Limited | Health & social care | 2016 |
| P Dooley Ltd | Professional & scientific | 2002 |
| P F Landscaping and Maintenance Ltd | Professional & scientific | 2025 |
| P H Carpentry Ltd | Construction | 2022 |
| P J Eckel Ltd | Professional & scientific | 2002 |
| P L Carey & Co Limited | Professional & scientific | 2013 |
| P Murphy Offshore Limited | Administrative & support | 2017 |
| P&Lg Properties Ltd | Real estate | 2020 |
| P&P Design Ltd | Wholesale & retail | 2018 |
| P.M.D Cleaning Service Ltd | Administrative & support | 2014 |
| P.M.D Electronics Limited | Wholesale & retail | 2017 |
| P.R.K Real Estates Ltd | Real estate | 2019 |
| P2 Technology Ltd | Information & communication | 2026 |
| P@E Commercial System Ltd | Construction | 2022 |
| P@R Commercial Services Limited | Construction | 2016 |
| PA Enterprise Ltd | Real estate | 2025 |
| PAA8 Limited | Extraterritorial | 2016 |
| PAC Consult Ltd | Construction | 2024 |
| Pace Padel Holdings Ltd | Financial services | 2026 |
| Pace Padel Ltd | Arts & recreation | 2024 |
| Pacitti Asset Management Company Limited | Professional & scientific | 2016 |
| Paco Annex Supported Living Limited | Health & social care | 2025 |
| Paddie Technologies Ltd | Professional & scientific | 2025 |
| Paediatric Gastroenterology Consultancy (London) Ltd | Health & social care | 2022 |
| Pagani Properties Ltd | Real estate | 2022 |
| Page Brothers Limited | Construction | 2012 |
| Page Heath Court Limited | Households | 2015 |
| Page Heath Lane Freeholders Limited | Households | 2017 |
| Page Heath Villas Management Company Limited | Households | 2022 |
| Paige and Posture Ltd | Education | 2025 |
| Palace Construction Ltd | Construction | 2015 |
| Palace Grove RTM Company Limited | Other services | 2012 |
| Palace Scaffolding Company (London) Limited | Construction | 1981 |
| Palace Square (Crystal Palace) RTM Company Limited | Real estate | 2022 |
| Palace View Apartments Management Company Limited | Households | 2015 |
| Palczynski Ltd | Construction | 2018 |
| Pallmall (UK) Limited | Information & communication | 2005 |
| Palm Advisory Limited | Financial services | 2014 |
| Palm Court (Poplar High Street) RTM Company Limited | Households | 2020 |
| Palm New Products Limited | Financial services | 2011 |
| Palm Visual Ltd | Professional & scientific | 2018 |
| Palmer Maintenance Services Ltd | Other services | 2015 |
| Palmerston Property Estate Limited | Real estate | 2022 |
| Palwar Ltd | Financial services | 2014 |
| Panaf Limited | Information & communication | 1998 |
| Panagua Ltd | Wholesale & retail | 2013 |
| Panciu Distribution Ltd | Wholesale & retail | 2021 |
| Panfield Lane Management Company Ltd | Households | 2017 |
| Panic Industries Limited | Professional & scientific | 2014 |
| Panmedica Medical Distribution Limited | Wholesale & retail | 2013 |
| Panmedica Solutions Ltd | Wholesale & retail | 2024 |
| Panmure Sydenham Ltd | Real estate | 2025 |
| Paper Traders International Limited | Other services | 1992 |
| Papouis Hotels (UK) Ltd | Hospitality | 2020 |
| PAR Excellence Limited | Real estate | 1986 |
| Para Properties Limited | Real estate | 2013 |
| Para Property Developments Ltd | Construction | 2019 |
| Paragon Building & Construction Limited | Construction | 2018 |
| Paragon Car Limited | Financial services | 2000 |
| Paragon Household Limited | Financial services | 2001 |
| Paragon Physio Ltd | Health & social care | 2026 |
| Paraomni Ltd | Information & communication | 2021 |
| Parbaste Limited | Households | 1981 |
| Parijat Limited | Other services | 2018 |
| Parin Investments Limited | Extraterritorial | 2020 |
| Park Gate (Bromley) Management Limited | Households | 2005 |
| Park Hill Road Management Ltd | Households | 2004 |
| Park Langley Delicatessen Ltd | Wholesale & retail | 2023 |
| Park Point RTM Company Limited | Households | 2022 |
| Park Road (Beckenham) Management Limited | Real estate | 1992 |
| Park Rutland Investments (London) Limited | Real estate | 1957 |
| Parkfords Management Limited | Real estate | 2013 |
| Parkham Court Management Limited | Real estate | 2000 |
| Parkhill Court Limited | Real estate | 2000 |
| Parkland Management Company Limited | Administrative & support | 1987 |
| Parklands Turf Company and Farm Produce Ltd | Wholesale & retail | 2013 |
| Parlo Consulting Limited | Professional & scientific | 2016 |
| Parsons-Cole Equestrian Ltd | Agriculture & fishing | 2020 |
| Parsons-Cole Nortonbury North Ltd | Agriculture & fishing | 2021 |
| Parthenon Properties Limited | Real estate | 2015 |
| Partica Bromley Limited | Wholesale & retail | 2010 |
| Partners Growth Ltd | Professional & scientific | 2018 |
| Partnership Asset Finance Limited | Financial services | 2014 |
| Partnership Finance Limited | Financial services | 2013 |
| Passion Cleaning Services Limited | Extraterritorial | 2024 |
| Passion Print Limited | Administrative & support | 2013 |
| PAT & Co Medics Ltd | Health & social care | 2015 |
| Patama Limited | Construction | 2014 |
| Paterson Landscaping and Building Ltd | Extraterritorial | 2016 |
| Pathfinder UK Consultancy Limited | Administrative & support | 2024 |
| Patios & Paving MTD Ltd | Construction | 2023 |
| Patnem Ltd | Construction | 2017 |
| Patric Capon Limited | Wholesale & retail | 1973 |