| Onciu Services Ltd | Transport & logistics | 2025 |
| One OUT Ltd | Arts & recreation | 2019 |
| One Woman Show Ltd | Professional & scientific | 2024 |
| Oneill Electrical Installations Limited | Energy | 2021 |
| Opal Traders Ltd | Professional & scientific | 2022 |
| Opalfine Limited | Professional & scientific | 1986 |
| Operate Real Estate Limited | Professional & scientific | 2024 |
| Orbix UK Ltd | Information & communication | 2005 |
| Orion Media Sales Ltd | Information & communication | 2026 |
| Osehy Ltd | Wholesale & retail | 2024 |
| OWL Publications Limited | Information & communication | 2025 |
| Ownyou Ltd | Information & communication | 2021 |
| Oxfordgate Limited | Wholesale & retail | 2024 |
| Oxygen Business Limited | Professional & scientific | 2020 |
| Oyster Mayfair Ltd | Manufacturing | 2016 |
| Ozley Ltd | Other services | 2012 |
| O’Neill Electrical Group Limited | Construction | 2026 |
| P C Scaffolding (Surrey) Limited | Construction | 2013 |
| P&R - 2016 Limited | Wholesale & retail | 2016 |
| Pacifika International Limited | Real estate | 2026 |
| PAL Security & Cleaning Services Management Ltd | Administrative & support | 2007 |
| Panda Plumbing & Maintenance Limited | Construction | 2020 |
| Pangem Global Limited | Information & communication | 2025 |
| Panther Offshore Limited | Professional & scientific | 2014 |
| Paragon Development and Construction Services Limited | Construction | 2013 |
| Parent and Child Fostering Assessments Limited | Health & social care | 2014 |
| Parent and Child Step-Down Accommodation Ltd | Hospitality | 2025 |
| Partners and Advisory Ltd | Administrative & support | 2026 |
| Passion Fish Limited | Information & communication | 2015 |
| Pattern Recognition Ltd | Professional & scientific | 2026 |
| Pattom Limited | Health & social care | 2009 |
| Paul Geaves Holidays Ltd | Administrative & support | 2025 |
| Paul S Street Ltd | Manufacturing | 2022 |
| Pawsitive Group Ltd | Wholesale & retail | 2025 |
| PC Buddy Limited | Other services | 2012 |
| Pc-Word Consultants Limited | Information & communication | 1997 |
| PCO Admin Limited | Professional & scientific | 2006 |
| PDA Consulting Ltd | Professional & scientific | 2017 |
| Peach JAM Ltd | Information & communication | 2025 |
| Pearl and Threads Ltd | Wholesale & retail | 2025 |
| PEC Investments Limited | Health & social care | 2019 |
| Pell Property Limited | Real estate | 2014 |
| Pelvifit Ltd | Arts & recreation | 2023 |
| Pembroke Advisors Limited | Financial services | 1996 |
| Pembroke Consulting Group Limited | Professional & scientific | 2000 |
| Pembroke Finance Limited | Financial services | 2001 |
| Pembroke Financial Management Limited | Financial services | 2009 |
| Pembroke General Insurance Services Limited | Financial services | 2000 |
| Peneloper Limited | Wholesale & retail | 2015 |
| Pennyhill Homes (Holdings) Limited | Financial services | 2022 |
| People Like US Design Limited | Professional & scientific | 2016 |
| Perfect Reception Ltd | Administrative & support | 2013 |
| Performiq Limited | Other services | 2025 |
| Perlux Limited | Information & communication | 2020 |
| Perplan Limited | Administrative & support | 2016 |
| Persian Kitchen Ltd | Hospitality | 2018 |
| Persian Restaurant Ltd | Hospitality | 2025 |
| Persona Executive Limited | Administrative & support | 2017 |
| Peter Cummins Consulting Limited | Professional & scientific | 2023 |
| Peter James Harris Ltd | Construction | 2026 |
| Peter's Power Installations Ltd | Construction | 2022 |
| Petite Amis Ltd | Wholesale & retail | 2021 |
| PF Manzi Consultancy Ltd | Information & communication | 2020 |
| Philip Duvall Limited | Professional & scientific | 2013 |
| PHM 360 Ltd | Hospitality | 2023 |
| Phoenix Running Hampshire Ltd | Arts & recreation | 2025 |
| Phoenix Running Ltd | Arts & recreation | 2015 |
| Phoenix Virtual Running Ltd | Arts & recreation | 2016 |
| Physiom Ltd | Health & social care | 2018 |
| Pilates and Dance UK Limited | Arts & recreation | 2021 |
| Pilgrim Wealth Management Limited | Professional & scientific | 2011 |
| PIM 2 Ltd | Other services | 2019 |
| Pinecone Heating Plumbing Air-Conditioning Renewables Services Ltd | Construction | 2014 |
| Pinemount Properties Limited | Real estate | 2002 |
| Pinewood Label Systems Limited | Manufacturing | 1979 |
| Pinkstone White Limited | Other services | 2022 |
| Pinnacle Event Technology Limited | Wholesale & retail | 2021 |
| Pinseree Limited | Hospitality | 2023 |
| Pioneer Wall Cladding & Building Insulation Ltd. | Construction | 2012 |
| Pipe Dreams Plumbing and Heating Ltd | Construction | 2011 |
| Piwee Limited | Health & social care | 2014 |
| Pizziamo Limited | Hospitality | 2020 |
| Planova Ltd | Professional & scientific | 2025 |
| Plantlife Services Limited | Professional & scientific | 2021 |
| Platform Sports Coaching Ltd. | Education | 2016 |
| Playrooms.Io Ltd | Professional & scientific | 2025 |
| PLG Sports Coaching Ltd | Education | 2024 |
| PLW Property Ltd | Real estate | 2024 |
| Pocadvisor Ltd | Information & communication | 2025 |
| Podcast Crew Ltd | Administrative & support | 2025 |
| Pogo Progress Ltd | Education | 2018 |
| Polytomous Limited | Professional & scientific | 2021 |
| Porterhouse Developments Limited | Construction | 2020 |
| Porterhouse Interiors Limited | Professional & scientific | 2020 |
| POS Advisory & Consulting Ltd | Professional & scientific | 2026 |
| Powercom Installations Limited | Construction | 2001 |
| Practical Medical English Ltd | Education | 2023 |
| Pralav Digital Limited | Information & communication | 2026 |
| Pramaan Tech Ltd | Information & communication | 2023 |
| PREBEND1 Limited | Real estate | 2016 |