| Otus Clinical Services Limited | Extraterritorial | 2004 |
| OUI Select Ltd | Information & communication | 2019 |
| OUR Angels Homecare Services Limited | Public administration | 2025 |
| OUR Forte Ltd | Wholesale & retail | 2025 |
| OUR Heath Barn CIC | Arts & recreation | 2024 |
| OUT of Space Limited | Real estate | 2025 |
| Outapp Ltd | Information & communication | 2019 |
| Ouve Ltd | Wholesale & retail | 2026 |
| Overr Ltd | Wholesale & retail | 2022 |
| OVI & Guan Ltd | Construction | 2022 |
| OVI B.E.E Ltd | Health & social care | 2023 |
| Owen Trading Limited | Financial services | 2019 |
| OWL Landscapes Limited | Construction | 2018 |
| Ownership of Time Ltd | Information & communication | 2025 |
| Oxley Aesthetics Ltd | Health & social care | 2018 |
| Oxygen Oasis Ltd | Health & social care | 2025 |
| OYO Entertainments Ltd | Hospitality | 2024 |
| Ozen Mobile Barber Services Ltd | Other services | 2020 |
| Ozric Tentacles Limited | Arts & recreation | 2021 |
| P & B Jump Limited | Energy | 2013 |
| P & M Deco Services Ltd | Construction | 2022 |
| P a B Mortgages Ltd | Administrative & support | 2014 |
| P a Electrical (Herts) Ltd | Construction | 2017 |
| P J Brown & Sons Limited | Water & waste | 2018 |
| P TAG Limited | Information & communication | 2018 |
| P&B Estates Ltd | Real estate | 2018 |
| P&B Tours Limited | Administrative & support | 2016 |
| P.B. Events Limited | Other services | 2017 |
| P.S Talent Ltd | Administrative & support | 2023 |
| P.S Theatre Ltd | Extraterritorial | 2021 |
| P.T.D Logistics Limited | Transport & logistics | 2025 |
| P3C Consultancy Limited | Information & communication | 2011 |
| P4 Recruitment Ltd | Administrative & support | 2023 |
| Paarl Ltd | Professional & scientific | 2018 |
| PAC CAD Ltd | Professional & scientific | 2022 |
| Pace Accountants Ltd | Professional & scientific | 2011 |
| Pace FD Ltd | Professional & scientific | 2017 |
| Pace Personal Finance Ltd | Administrative & support | 2010 |
| Pack MAN and Van Ltd | Transport & logistics | 2019 |
| Paddock View (Yapton) Management Company Limited | Households | 2021 |
| Padstow Touring Park Ltd | Hospitality | 2005 |
| Page Entertainment Limited | Arts & recreation | 2025 |
| Painted Vulture Productions Ltd | Information & communication | 2020 |
| Paladin Commercial Credit Management Limited | Administrative & support | 1997 |
| Pallets for Purpose Ltd | Other services | 2022 |
| Palletworks (South) Limited | Transport & logistics | 2008 |
| Palletworks Limited | Transport & logistics | 2005 |
| Palmer Air Conditioning (Corporate Trustee) Limited | Financial services | 2024 |
| Palmer Air Conditioning Limited | Administrative & support | 2003 |
| Palmer Initiatives Ltd | Professional & scientific | 2021 |
| Palmers & Sons Properties Holdings Limited | Financial services | 2016 |
| Palmers & Sons Properties Limited | Financial services | 2011 |
| Palmers (ST Albans) Limited | Wholesale & retail | 1997 |
| Palmo Trading Company Ltd | Wholesale & retail | 2016 |
| Paloma Beach T2.60 Limited | Professional & scientific | 1986 |
| Palomo Ltd | Construction | 2018 |
| Palushi Coaching Ltd | Other services | 2023 |
| PAN Dimension Limited | Professional & scientific | 2011 |
| Panache Ledgers Ltd | Professional & scientific | 2026 |
| Panache Ventures Ltd | Real estate | 2020 |
| Pancos Welding Limited | Construction | 2017 |
| Panda Labs Limited | Information & communication | 2013 |
| Pannell Consulting Limited | Information & communication | 2019 |
| PANORAMA22 Ltd | Wholesale & retail | 2022 |
| Pantamu Investments Ltd | Mining & quarrying | 2025 |
| PAO Contracting Ltd | Professional & scientific | 2013 |
| Papa November Limited | Transport & logistics | 2023 |
| Paparazzi Nepal Limited | Wholesale & retail | 2024 |
| Paradise Planning Ltd | Extraterritorial | 2024 |
| Paramount Fire Limited | Construction | 2010 |
| Parbola Holiday Park Ltd | Arts & recreation | 2021 |
| Parcel Rescue Limited | Information & communication | 2025 |
| Parceltap Limited | Wholesale & retail | 2025 |
| Pardha Enterprises Ltd | Wholesale & retail | 2023 |
| Pari Rice Limited | Wholesale & retail | 1990 |
| Park Avenue Freehold Limited | Administrative & support | 1986 |
| Park Road Homes Ltd | Real estate | 2019 |
| Park Road Lexden Management Company Limited | Households | 2014 |
| Park Squared Limited | Professional & scientific | 2010 |
| Park View (Hemel Hempstead) Management Company Limited | Real estate | 2006 |
| Park View (Longbridge) Management Company Limited | Households | 2011 |
| Park&Recharge Ltd | Information & communication | 2017 |
| Parkare Limited | Manufacturing | 1988 |
| Parker Hannifin (GB) Limited | Real estate | 1946 |
| Parker Hannifin (Holdings) Limited | Professional & scientific | 2000 |
| Parker Hannifin Limited | Manufacturing | 2011 |
| Parker Hannifin Manufacturing Limited | Manufacturing | 2003 |
| Parker Stanley Limited | Administrative & support | 2019 |
| Parker-Hannifin Pension Trustees Limited | Financial services | 1983 |
| Parkfield REC Development Limited | Construction | 2024 |
| Parrott Effects Ltd | Manufacturing | 2022 |
| Parsons-Abbott Consulting Limited | Professional & scientific | 2013 |
| Partnership Building Services Limited | Construction | 2018 |
| Party Rascals Ltd | Arts & recreation | 2026 |
| Pasta LA Vista Baby Ltd | Hospitality | 2024 |
| Pastures New Property Management Ltd | Households | 2026 |
| PAT Developments Limited | Construction | 2018 |
| Paterfamilias Ltd | Information & communication | 2024 |
| Patience Rehab & Care Ltd. | Health & social care | 2019 |
| Patient Billing Ltd | Administrative & support | 2018 |