| Optima Safety Group Limited | Health & social care | 2025 |
| Optimum Capacity Services Limited | Information & communication | 2020 |
| Optimum Flooring Services Limited | Construction | 2017 |
| Option One Builders Limited | Construction | 1999 |
| Orchard Interiors Limited | Administrative & support | 1995 |
| Orchard Retail Group Ltd | Professional & scientific | 2025 |
| ORG Event Planning Limited | Professional & scientific | 2022 |
| Oriental FRY Ltd | Hospitality | 2020 |
| Oriental Spa Therapy Co., Ltd | Health & social care | 2015 |
| Origamintrader Limited | Wholesale & retail | 2017 |
| Origin Media Group Ltd | Professional & scientific | 2017 |
| Orion Properties (Stoke) Ltd | Construction | 2019 |
| Orra Property Ltd | Construction | 2019 |
| Osvald Care Ltd | Health & social care | 2021 |
| Oswestry Pallets Ltd | Manufacturing | 2015 |
| Otanah Care & Support Limited | Health & social care | 2025 |
| Outdoor Vans Limited | Wholesale & retail | 2013 |
| Outsource CAD Ltd | Professional & scientific | 2026 |
| Owen Accountancy and Technology Services Ltd | Professional & scientific | 2018 |
| Oxygen Clinic Stoke Ltd | Health & social care | 2022 |
| Ozzy Consulting Ltd | Professional & scientific | 2023 |
| P & a Estate Control LLP | | 2006 |
| P B Installations & Civils Ltd | Construction | 2013 |
| P Kearney Sales Ltd | Wholesale & retail | 2025 |
| P L Haime Joinery Limited | Construction | 2008 |
| P&B Healthcare Limited | Health & social care | 2020 |
| P&D Distribution Limited | Transport & logistics | 1999 |
| P-K-R Regional Investments Limited | Real estate | 2025 |
| P.B.G. Properties Limited | Real estate | 2019 |
| P.T. Miles Limited | Real estate | 2007 |
| Pace Residential Group Limited | Financial services | 2023 |
| Pace Systems (N.I.) Ltd | Construction | 2011 |
| Pack Hub Ltd | Extraterritorial | 2015 |
| Paintball Matrix Limited | Arts & recreation | 2010 |
| Palace Guards Limited | Real estate | 2020 |
| Pale Dog Ltd | Professional & scientific | 2024 |
| Palick Limited | Manufacturing | 1944 |
| Pana Services Ltd | Real estate | 2003 |
| Panda and FOX Limited | Real estate | 2021 |
| Panjtan Retail Newcastle Ltd | Wholesale & retail | 2022 |
| Papias Stoke Limited | Hospitality | 2025 |
| Paragon Management Consultancy Ltd | Professional & scientific | 2023 |
| Paramount Food Solutions Ltd | Hospitality | 2024 |
| Parful Rentals Ltd | Real estate | 2025 |
| Parker Consultancy Services Ltd | Professional & scientific | 2020 |
| Parker Recruitment Limited | Administrative & support | 2017 |
| Parklands (Bucknall) Management Company Limited | Real estate | 1999 |
| Parx Financial Services Ltd | Financial services | 2023 |
| Pater Noster (UK) Limited | Real estate | 2014 |
| PATHWAYS2PROPERTY Ltd | Households | 2020 |
| Patrick Lally Investment Portfolio Ltd | Real estate | 2022 |
| Paul Devlin Mechanical Services Ltd | Construction | 2014 |
| Paul Swail Guiding Ltd | Administrative & support | 2025 |
| Paula's Driving School Ltd | Education | 2025 |
| PAY IO Ltd | Information & communication | 2019 |
| Payne Advisory Limited | Professional & scientific | 2025 |
| PB Avio Ltd | Professional & scientific | 2024 |
| Pccb Ltd | Financial services | 2014 |
| PCH Property Limited | Real estate | 2021 |
| PD Savage Ltd | Real estate | 2001 |
| PDF Transport Ltd | Transport & logistics | 2019 |
| PDR Communications Limited | Information & communication | 1993 |
| Pdrworld Limited | Professional & scientific | 2003 |
| Peak FS Ltd | Financial services | 2019 |
| Peamag Social Ltd | Health & social care | 2026 |
| Peaton Learning Limited | Administrative & support | 2008 |
| Pegb Ltd | Hospitality | 2020 |
| Penbroath Luxury Cottages Ltd | Hospitality | 2023 |
| Peniel Chapel International Ministries Ltd | Other services | 2024 |
| Penny Lane (Ashington) Ltd | Financial services | 2021 |
| Penny Lane (Blyth) Ltd | Financial services | 2021 |
| Pennys Hairdressing Limited | Other services | 2002 |
| Peony Court Limited | Hospitality | 2024 |
| Pereesa Properties Ltd | Real estate | 2024 |
| Perfect Fit Blinds Limited | Administrative & support | 2017 |
| Peridot Logistics Ltd | Transport & logistics | 2025 |
| Perkin Property & Maintenance Ltd | Financial services | 2026 |
| Pete the Seat Ltd | Manufacturing | 2016 |
| Petra Mcguirk Consultancy Ltd | Professional & scientific | 2022 |
| Pexion.Com Ltd | Extraterritorial | 1951 |
| Peypin Investments Limited | Professional & scientific | 2013 |
| PG Sealants Ltd | Construction | 2018 |
| Phalanx Leonidas Holdings Ltd | Financial services | 2024 |
| Pharmacist Live Limited | Other services | 2008 |
| Pharmacy @ Home Ltd | Wholesale & retail | 2022 |
| Pharmaforhealth Ltd | Wholesale & retail | 2026 |
| Pharmasig Ltd | Professional & scientific | 2018 |
| Pharmexplorer Ltd | Information & communication | 2024 |
| Phemarc Holdings Ltd | Professional & scientific | 2024 |
| Phil Sherratt Cars Limited | Wholesale & retail | 2022 |
| Phil Weston Ltd | Construction | 2026 |
| Phillips Enterprises Group Ltd | Professional & scientific | 2019 |
| PHM Wealth Management LLP | | 2012 |
| Phoenix Learning Communities | Education | 2020 |
| Phoenix Occupational Health Ltd | Health & social care | 2011 |
| Phoenix Property LSF Limited | Real estate | 2025 |
| Phone Surgery Ltd | Other services | 2018 |
| Phones Connect Limited | Wholesale & retail | 2020 |
| Photography for Creatives Limited | Professional & scientific | 2022 |
| Phuket Express Limited | Hospitality | 2026 |