| Oslec Limited | Real estate | 1954 |
| Osprey Acquisitions Limited | Administrative & support | 2006 |
| Osprey Holdco Limited | Professional & scientific | 2006 |
| Osprey Investco Limited | Financial services | 2021 |
| Osstem UK Limited | Wholesale & retail | 2012 |
| Osterling Property Ltd | Real estate | 2024 |
| OT24HC Ltd | Wholesale & retail | 2019 |
| OV Radio Ltd | Information & communication | 2025 |
| Over Power Fitness (Huntingdon) Ltd | Arts & recreation | 2023 |
| Overslade Property Limited | Real estate | 2017 |
| Ovidian Construction Ltd | Construction | 2020 |
| Ovol Ltd | Real estate | 2009 |
| Owen's Horseboxes Limited | Manufacturing | 2013 |
| Owens Property Ltd | Real estate | 2020 |
| OWL Castings Ltd | Manufacturing | 2020 |
| P & K Chalkley Limited | Real estate | 2024 |
| P & S Heating and Plumbing Ltd | Construction | 2013 |
| P a White Installations Limited | Construction | 2018 |
| P B Forbes Limited | Health & social care | 2014 |
| P Harper & Sons Limited | Transport & logistics | 2003 |
| P&M Pumps Ltd | Wholesale & retail | 2009 |
| P&P Autocare Ltd | Wholesale & retail | 2026 |
| P-Trans Express Ltd | Transport & logistics | 2024 |
| P.D. Topham Limited | Extraterritorial | 1998 |
| P.G.M.I. Limited | Information & communication | 2003 |
| P.M.E. Installations Ltd | Construction | 2007 |
| Paddocks (Northill) Limited | Real estate | 2005 |
| Pakos Ltd | Transport & logistics | 2014 |
| Palace Yard Farm Ltd | Agriculture & fishing | 2026 |
| Palavra Ltd | Information & communication | 2024 |
| Palestone Property Limited | Real estate | 2018 |
| Palestone Publishing Limited | Arts & recreation | 2016 |
| Palffy Trans Ltd | Transport & logistics | 2018 |
| Pallet AID Support Services Ltd | Professional & scientific | 2022 |
| Palm Tree Pictures Ltd | Information & communication | 2026 |
| Palmer Close Freeholders Limited | Households | 2019 |
| Pamd Properties Ltd | Real estate | 2019 |
| Panacor Ltd | Health & social care | 2020 |
| Panchromos Limited | Manufacturing | 2003 |
| Panther Locksmiths Limited | Other services | 2015 |
| Papa Luigi Hunts Ltd | Hospitality | 2023 |
| Papworth Brewery Limited | Manufacturing | 2014 |
| Parallel Imagery Ltd | Administrative & support | 2002 |
| Parcelabel Ltd | Transport & logistics | 2024 |
| Park Farm Industries Limited | Agriculture & fishing | 2025 |
| Park Farm Sporting Limited | Arts & recreation | 2024 |
| Park House (Ramsey) Management Limited | Households | 1999 |
| Park Roofing Contractors Limited | Construction | 2011 |
| Park Street Consulting Limited | Professional & scientific | 2007 |
| Parkside Owners (Huntingdon) Limited | Households | 2002 |
| Parrie Airworthiness Ltd | Professional & scientific | 2022 |
| Parrie Property Ltd | Real estate | 2022 |
| Pars Engineering Ltd | Professional & scientific | 2022 |
| Parsell Electrics Limited | Construction | 2025 |
| Pascalidis Ltd | Health & social care | 2020 |
| Patches Haberdashery Ltd | Wholesale & retail | 2021 |
| Patio Pavers Direct Limited | Wholesale & retail | 2016 |
| Patriot Threads Ltd | Manufacturing | 2025 |
| Patrycja Ltd | Transport & logistics | 2011 |
| Pattinson & Stead (2005) Limited | Professional & scientific | 2005 |
| Pattle Enterprise Limited | Administrative & support | 2024 |
| Paul & Leigh Ltd | Real estate | 2021 |
| Paul Ashmore Limited | Construction | 2002 |
| Paul Smith Heating & Plumbing Ltd | Construction | 2011 |
| Paul Toyer Golf Limited | Arts & recreation | 2006 |
| Pavcontrols Ltd. | Information & communication | 2016 |
| Pavet Group Limited | Professional & scientific | 2024 |
| Pavilion Seven Ltd | Professional & scientific | 2014 |
| Pavitt IP Limited | Administrative & support | 2024 |
| Pawel Makarewicz Ltd | Transport & logistics | 2018 |
| Paws on Floors Ltd | Wholesale & retail | 2020 |
| Paxton Highways Consultancy Limited | Professional & scientific | 2014 |
| Pcpm Services Limited | Administrative & support | 2022 |
| PD Huggins (Potatoes) Ltd | Administrative & support | 2012 |
| PD Jackson Consulting Ltd | Professional & scientific | 2025 |
| Peacock Early Years Provisions Ltd | Health & social care | 2018 |
| Peaks Property Developments Ltd | Construction | 2026 |
| Pearl Global Properties Ltd | Real estate | 2022 |
| Pearlasia Limited | Manufacturing | 2014 |
| Pebconsulting Ltd | Transport & logistics | 2022 |
| Peckham Manor Limited | Hospitality | 2015 |
| Pella Pura Ltd | Wholesale & retail | 2025 |
| Pemat UK Ltd | Manufacturing | 2009 |
| Pemberley Management (Bedford) Limited | Households | 2023 |
| Pentley Park Consultants Ltd | Professional & scientific | 2015 |
| Peradutec Limited | Information & communication | 2017 |
| Percy Grace Homes Ltd | Households | 2020 |
| Percy Grace Projects Limited | Real estate | 2022 |
| Peregrine Holdco Limited | Financial services | 2026 |
| Period Secrets Limited | Real estate | 2023 |
| Perlec Performance Wiring Ltd | Manufacturing | 2013 |
| Perry Road Records Limited | Information & communication | 2007 |
| Perry Road Studios Limited | Information & communication | 2007 |
| PES Consultancy Ltd | Information & communication | 2022 |
| Peter James Electrical & Mechanical Services Ltd | Construction | 2022 |
| Peterborough HE Property Company Limited | Construction | 2020 |
| Peterborough R&D Property Company Limited | Construction | 2020 |
| Peterborough Sports Stadium Limited | Real estate | 1941 |
| PFF Holdco Limited | Agriculture & fishing | 2023 |
| Phaf Ltd | Hospitality | 2023 |