| Orsa 1900 Limited | Extraterritorial | 2000 |
| Orta Properties Ltd | Real estate | 2022 |
| Orz.Prop Ltd | Real estate | 2025 |
| OS Design & Planning Services Limited | Professional & scientific | 2015 |
| Osazon Homes Ltd | Real estate | 2026 |
| Osazoy Healthcare Ltd | Health & social care | 2024 |
| OUR Hearts to Your Home Ltd | Other services | 2022 |
| OUT of the Box Events Limited | Wholesale & retail | 2018 |
| Outfluir Ltd | Construction | 2020 |
| Outserve AI Limited | Information & communication | 2023 |
| Outsourced Solutionz Ltd | Professional & scientific | 2025 |
| Outwoods Brewing Co. Ltd | Manufacturing | 2022 |
| Outwoods Financial Planning Ltd | Professional & scientific | 2020 |
| Outwoods Management Company Limited | Real estate | 2006 |
| Overe Ltd | Information & communication | 2024 |
| Ovidiu Express Ltd | Transport & logistics | 2014 |
| Oviii Ltd | Transport & logistics | 2024 |
| Ovimore Limited | Financial services | 2015 |
| Owens Nutrition Limited | Manufacturing | 2000 |
| Oyasin Resources Ltd | Manufacturing | 2017 |
| Oyster Property Services Limited | Real estate | 2007 |
| OZ Activities.Com Limited | Wholesale & retail | 2010 |
| P & D Environmental Ltd | Manufacturing | 2012 |
| P & E Transport Ltd | Transport & logistics | 2020 |
| P a Gauranteed Limited | Health & social care | 2011 |
| P a Russell Building Contractors Limited | Construction | 2022 |
| P&D Marine Group Ltd | Financial services | 2020 |
| P&J Couriers Ltd | Transport & logistics | 2023 |
| P&L Hill Group Ltd | Financial services | 2024 |
| P&M Family Ltd | Real estate | 2022 |
| P.C.E. Installations (Holdings) Limited | Professional & scientific | 2003 |
| P.Ford Properties and Investments Limited | Real estate | 2023 |
| P.H.Electrical Installations Limited | Construction | 2012 |
| P.J. Motorsport Ltd. | Wholesale & retail | 1997 |
| P.Lasso Properties and Investments Ltd | Real estate | 2025 |
| P.Mircea Services Ltd | Transport & logistics | 2018 |
| Pacevolve Limited | Wholesale & retail | 2017 |
| Packington Free Range Ltd | Wholesale & retail | 2014 |
| Packington Poultry Limited | Agriculture & fishing | 2014 |
| Paddock Park Limited | Hospitality | 2017 |
| Padz Homes Ltd | Real estate | 2025 |
| Pahdc Ltd | Professional & scientific | 2024 |
| Paintaroma UK Ltd | Construction | 2025 |
| Pakeeza Foods Ltd | Wholesale & retail | 2020 |
| Pakistan Minerals Group Limited | Professional & scientific | 2025 |
| PAL Care Services Ltd | Health & social care | 2023 |
| Paleta Holdings Limited | Financial services | 2020 |
| Palletforce Logistics Kent and Berkshire Limited | Transport & logistics | 2015 |
| Palletforce Logistics Sussex Limited | Transport & logistics | 1971 |
| Palmer & Daughters Limited | Administrative & support | 2017 |
| Panavista Limited | Professional & scientific | 2015 |
| Pangolin Capital Limited | Real estate | 2022 |
| Panton & Co Accountants Limited | Professional & scientific | 2014 |
| Papilionem Path Limited | Professional & scientific | 2021 |
| Papillon PR Limited | Professional & scientific | 2012 |
| Paragon Cladding Limited | Construction | 2007 |
| Parkway Investments Limited | Professional & scientific | 2013 |
| Partscale Ltd | Professional & scientific | 2025 |
| Pathway Podiatry Ltd | Health & social care | 2024 |
| Pathways Physiotherapy Ltd | Health & social care | 2025 |
| Patimil Limited | Transport & logistics | 2014 |
| Paton Calvert Limited | Extraterritorial | 2001 |
| Patrik Haulage Ltd | Transport & logistics | 2024 |
| Pattrn Data Limited | Professional & scientific | 2023 |
| Patwen Ltd | Real estate | 2024 |
| Paul Hugh Plumbing & Heating Limited | Construction | 2010 |
| Paul Pickering Automotives Ltd | Transport & logistics | 2024 |
| Paul Shum Family Butchers Limited | Wholesale & retail | 2018 |
| Paul Stretton Ltd | Professional & scientific | 2024 |
| Paul Williams Solutions Limited | Extraterritorial | 2012 |
| Paul's Cafe Limited | Hospitality | 2014 |
| Paul's Gleaming Ovens Ltd | Administrative & support | 2024 |
| Paulgianinalogistic Ltd | Transport & logistics | 2026 |
| PAW Help UK Ltd | Other services | 2021 |
| Pawel Joinery Limited | Construction | 2013 |
| Paws a While Shelter CIC | Other services | 2025 |
| Paws in the Park Limited | Arts & recreation | 2021 |
| Pawshed Ltd | Wholesale & retail | 2025 |
| Pawsify Ltd | Wholesale & retail | 2016 |
| Pawtul Ltd | Information & communication | 2022 |
| PBM Inspection Services Limited | Hospitality | 1996 |
| PC Finance Consultants Ltd | Professional & scientific | 2016 |
| Pcvr Burton on Trent Limited | Administrative & support | 2018 |
| PDM Hose Ltd | Manufacturing | 2020 |
| Peace N Travel Ltd | Administrative & support | 2025 |
| Peace Nest Care Homes Ltd | Health & social care | 2024 |
| Peace Nest Care Ltd | Health & social care | 2025 |
| Peace Nest Homes Ltd | Real estate | 2025 |
| Peaceable Project Community Interest Company | Education | 2026 |
| Peak Accounting Services Ltd | Professional & scientific | 2024 |
| Peak Experience Limited | Extraterritorial | 2021 |
| Peak Sports District Academy Ltd | Education | 2025 |
| Peakforge Ltd | Wholesale & retail | 2025 |
| Pearsall Fabrications Limited | Administrative & support | 2009 |
| Peartree Engineering Consulting Limited | Professional & scientific | 2023 |
| Peeks Paving Ltd | Administrative & support | 2011 |
| Peel Place Management Company Limited | Households | 2007 |
| Peggistore Ltd | Wholesale & retail | 2023 |
| PEKUN29 Limited | Hospitality | 2025 |
| Penguinpay Ltd | Information & communication | 2024 |