| OSR Global Limited | Financial services | 2020 |
| OSR Holdings Limited | Financial services | 2020 |
| OTC Electrical Ltd | Manufacturing | 2026 |
| OUT Filming Limited | Information & communication | 2012 |
| OUT of Order Design Ltd | Administrative & support | 2017 |
| Owlshotts Management Company Limited | Households | 1979 |
| Oxygen Capital Limited | Professional & scientific | 2014 |
| Oxygene Services Group Ltd | Construction | 2018 |
| OZ Transport & Logistics Ltd | Transport & logistics | 2020 |
| Ozfox Limited | Transport & logistics | 2014 |
| Ozmas Commercial Ltd | Real estate | 2016 |
| P J Molloy & Co. Ltd | Professional & scientific | 2008 |
| P Woodman Construction Limited | Manufacturing | 2025 |
| P1 Electrical Ltd | Construction | 2019 |
| PAG Limited | Manufacturing | 1977 |
| Pallet Boards Limited | Manufacturing | 2021 |
| Papavero Procurement Consultancy Limited | Administrative & support | 2019 |
| Paradox FOX Limited | Arts & recreation | 2017 |
| Parceman Hill Ltd | Extraterritorial | 2020 |
| Pardus (Saffron View) Ltd | Real estate | 2022 |
| Pardy Holdings Limited | Manufacturing | 2019 |
| Paris Homes Group Ltd | Construction | 2022 |
| Parker Bathrooms and Kitchens Ltd | Wholesale & retail | 2015 |
| Parklands Lilliput Management Limited | Real estate | 2000 |
| Parkside Safety Services Ltd | Professional & scientific | 2019 |
| Parkway Sports Ltd | Wholesale & retail | 2009 |
| Parley Life Limited | Wholesale & retail | 2023 |
| Parmar Construction Limited | Construction | 2012 |
| Partners in Performance Global IP UK Limited | Professional & scientific | 2014 |
| Partners in Performance UK Limited | Professional & scientific | 2014 |
| Partypal Ltd | Information & communication | 2026 |
| Pasture Walk Management Company Limited | Households | 2019 |
| Pathway Luscombe Ltd | Construction | 2026 |
| Patrick Connolly Associates Ltd. | Professional & scientific | 2015 |
| Paul Canfield Plumbing & Heating Ltd | Construction | 2011 |
| Paul Iggulden Associates Ltd | Professional & scientific | 2007 |
| Paulie's Garage Ltd | Wholesale & retail | 2017 |
| Pavan Patel Consulting Limited | Information & communication | 2023 |
| Pave FIX Limited | Construction | 2013 |
| Pavilions (Gosport) Management Company Limited | Households | 2003 |
| Payroll Perfection Ltd | Administrative & support | 2014 |
| Pcgl Holdings Limited | Real estate | 2024 |
| Pd&L Management Ltd | Professional & scientific | 2026 |
| Pd&L Solutions Ltd | Professional & scientific | 2024 |
| Pdq-Containers Limited | Transport & logistics | 2024 |
| PE Trading Ltd | Wholesale & retail | 2017 |
| Pedalhounds Ltd | Manufacturing | 2004 |
| Pegg Electronics Limited | Manufacturing | 2017 |
| Pelly and Purdy Ltd | Wholesale & retail | 2024 |
| Pendennis Properties (Bournemouth) | Real estate | 1948 |
| Penelo Graphics Limited | Arts & recreation | 2021 |
| Penns Performance Saws Ltd | Manufacturing | 2024 |
| People F1RST Ltd | Professional & scientific | 2022 |
| People Results Limited | Professional & scientific | 2008 |
| Pepper POT Pubs Ltd | Hospitality | 2026 |
| Peppering 5 Ltd | Health & social care | 2025 |
| Perfect Day Pubs Ltd | Hospitality | 2011 |
| Performance Horse Therapy Ltd | Professional & scientific | 2019 |
| Performance Leasing Ltd | Administrative & support | 2021 |
| Performance Procurement Limited | Professional & scientific | 2023 |
| Performance Vision Limited | Other services | 2010 |
| Permateek International Limited | Manufacturing | 2011 |
| Pests Birds & Bugs Limited | Agriculture & fishing | 2016 |
| Peter Noble Limited | Other services | 1985 |
| Petrow Limited | Financial services | 2007 |
| Phase Civil Engineering Ltd | Construction | 2014 |
| Phemnet Community Interest Company | Information & communication | 2018 |
| Phil Smith BE Gorgeous Limited | Wholesale & retail | 2015 |
| Phillips Duplicators Limited | Administrative & support | 1965 |
| Philpot Investments Limited | Extraterritorial | 2008 |
| PHW Technical Ltd | Professional & scientific | 2019 |
| Picture Perfect Marketing Ltd | Professional & scientific | 2024 |
| Pier View ( Worthing ) Ltd | Hospitality | 2025 |
| Piffen Ltd | Information & communication | 2026 |
| Pilot Creative Limited | Information & communication | 2010 |
| Pine Breeze (Poole) Management Company Ltd | Households | 2020 |
| Pineville Management Company Limited | Households | 2010 |
| Pinewood Enterprises Limited | Real estate | 2016 |
| Pinewood Landscapes (Southern) Limited | Administrative & support | 1999 |
| Pinewood Multiservices Consultancy Ltd | Professional & scientific | 2015 |
| Ping Property Leasing Ltd | Real estate | 2025 |
| Ping Property Ltd | Hospitality | 2025 |
| Pingproperties Ltd | Real estate | 2020 |
| Pink & White Nails YL Ltd | Other services | 2026 |
| Pinnacle Appointments Ltd | Administrative & support | 2016 |
| PJS Solutions Limited | Construction | 2015 |
| PK Services (London) Limited | Construction | 2014 |
| Plan X Technology Ltd | Professional & scientific | 2021 |
| PLAN57 Mentoring Ltd | Administrative & support | 2022 |
| Planet Green Ltd | Extraterritorial | 2010 |
| Planning Issues Limited | Professional & scientific | 2001 |
| Platinum Care at Home Ltd | Health & social care | 2010 |
| Platinum Security Limited | Administrative & support | 2004 |
| Playmonster UK Ltd | Manufacturing | 1993 |
| Pleasure ME Publishing Limited | Wholesale & retail | 2012 |
| Plumb Solutions (Southern) Limited | Construction | 2016 |
| Plumbing Works Ltd | Construction | 2017 |
| PM Windup (2022) Limited | Wholesale & retail | 2003 |
| Podcast Labs Ltd | Information & communication | 2015 |
| Point Bidco Limited | Professional & scientific | 2021 |