| Owen Construction Consultancy Limited | Construction | 2004 |
| Oxford AI for Business Alumni Ltd | Other services | 2025 |
| Oxvoltage Limited | Manufacturing | 2022 |
| Ozdora Ltd | Wholesale & retail | 2019 |
| Ozigi Ltd | Professional & scientific | 2011 |
| OZIMKOV88 Ltd | Transport & logistics | 2019 |
| Ozkan Corporations Ltd | Other services | 2017 |
| Ozvatan Limited | Hospitality | 2016 |
| OZZTECH1 Limited | Administrative & support | 2024 |
| P & R Restoration Limited | Construction | 2013 |
| P J Dunbar Builders Limited | Construction | 2012 |
| P S Analytical Research Limited | Financial services | 2002 |
| P&G Build Limited | Construction | 2022 |
| P&K Building Limited | Construction | 2015 |
| P&Lm Ltd | Wholesale & retail | 2025 |
| P&M Brace Consult Ltd | Professional & scientific | 2026 |
| P.Best Ltd | Wholesale & retail | 2025 |
| P.Best(London) Ltd | Wholesale & retail | 2022 |
| P.C. Roofing Limited | Construction | 2003 |
| P.G.M. Maintenance Limited | Construction | 1998 |
| P.M. Holland Limited | Manufacturing | 2014 |
| P.S. Analytical Limited | Manufacturing | 1981 |
| P.S. Manufacturing Limited | Extraterritorial | 1989 |
| P.S.R. Management Services Limited | Professional & scientific | 2001 |
| P.T.E Rock of Ages Ltd | Administrative & support | 2020 |
| P2Z Limited | Construction | 2017 |
| P3S Solutions Limited | Other services | 2014 |
| PA Kona Ltd | Professional & scientific | 2026 |
| Paale Ltd | Households | 2022 |
| Paavo Media Ltd | Information & communication | 2009 |
| PAC Building Services Limited | Construction | 2021 |
| Padama Ltd | Wholesale & retail | 2025 |
| Padel Xtra BR3 Club Langley Ltd | Arts & recreation | 2024 |
| Padel Xtra BR3 Langley Court Ltd | Arts & recreation | 2024 |
| Padel Xtra BR6 Ltd | Arts & recreation | 2024 |
| Padel Xtra Clubs Limited | Arts & recreation | 2025 |
| Padel Xtra Education Limited | Arts & recreation | 2025 |
| Padel Xtra Group Limited | Arts & recreation | 2025 |
| Padel Xtra GU7 Ltd | Arts & recreation | 2024 |
| Padel Xtra L&L 2 Limited | Arts & recreation | 2025 |
| Padel Xtra Leisure Facilities Limited | Arts & recreation | 2025 |
| Padel Xtra Limited | Arts & recreation | 2023 |
| Padel Xtra W12 Ltd | Arts & recreation | 2024 |
| Padel Xtra Warehouses Limited | Arts & recreation | 2025 |
| Paintcone Ltd | Manufacturing | 2024 |
| Paints & Papers Interiors Ltd | Construction | 2014 |
| Palcorin Limited | Hospitality | 2017 |
| Palencia Digital Ltd | Professional & scientific | 2026 |
| Palm Kitchen Limited | Hospitality | 2026 |
| Palme Holdings Ltd | Real estate | 2026 |
| Palms Payment Solutions Limited | Information & communication | 2022 |
| Pals Solution Limited | Transport & logistics | 2023 |
| PAN Autos (Brokers) Ltd | Wholesale & retail | 2013 |
| Pangsway Limited | Education | 1995 |
| Panoptic Resolutions Limited | Financial services | 2018 |
| Panthera Advisory Limited | Professional & scientific | 2017 |
| Panthios UK Ltd | Other services | 2022 |
| Papa Zebra Education Services Ltd | Education | 2024 |
| Papafio Contracted Services Limited | Information & communication | 2020 |
| Paper the Cracks Limited | Construction | 2025 |
| Parade Cafe 2020 Ltd | Hospitality | 2020 |
| Paragon Electrical Services Limited | Construction | 1995 |
| Paragon Place Property Limited | Real estate | 2015 |
| Paramount Heating Services Limited | Construction | 2020 |
| Pargar Ltd | Construction | 2025 |
| Parijat Ceramics Ltd | Manufacturing | 2024 |
| Parijat Consulting Ltd | Information & communication | 2023 |
| Park Avenue Property Limited | Real estate | 2016 |
| Park Lodge (Norwood) Residents Association Limited | Households | 1970 |
| Park Lodge RTM Company Limited | Households | 2016 |
| Park Office Solutions Limited | Administrative & support | 2020 |
| Parker AV Group Limited | Information & communication | 2019 |
| Parkside Management Consultancy Services Limited | Professional & scientific | 2024 |
| Parkstone FM Limited | Administrative & support | 2024 |
| Parkway Facilities Management Limited | Administrative & support | 2013 |
| Parr & RO Limited | Extraterritorial | 2021 |
| Parsons Brothers Laundries Ltd | Other services | 2008 |
| Party Wall Mediation Scheme LLP | | 2021 |
| Passed Ltd | Professional & scientific | 2024 |
| Patio Supplies Limited | Wholesale & retail | 2024 |
| Paubon Ltd | Information & communication | 2021 |
| Paul B Designs Ltd | Professional & scientific | 2019 |
| Paul Gosling Advisory LLP | | 2019 |
| Paul Gosling FI LLP | | 2019 |
| Paul Mean Electrical Limited | Professional & scientific | 2003 |
| Pauljane Global Ltd | Professional & scientific | 2026 |
| Pavilion Petts Wood Ltd | Health & social care | 2012 |
| Pawlaland Ltd | Wholesale & retail | 2022 |
| Payrolls.Com Limited | Professional & scientific | 2000 |
| PB Consultancy Projects Limited | Professional & scientific | 2023 |
| PB Dodgeball CIC | Arts & recreation | 2023 |
| PCM Management Consulting Limited | Professional & scientific | 2023 |
| PDL Fabrication & Welding Services Limited | Construction | 2009 |
| Peaches Skincare and Aesthetics Ltd | Other services | 2025 |
| Pearl Builders & Stone Restoration Ltd | Construction | 2003 |
| Pearl Homes Kent Ltd | Construction | 2018 |
| Pearl's Contracts Limited | Health & social care | 2015 |
| Pearson Anderson International Ltd | Administrative & support | 2019 |
| Peezedco Ltd | Health & social care | 2016 |
| Pegasus Capital Services Limited | Financial services | 2013 |