| Pro L&C Ltd | Transport & logistics | 2018 |
| Pro Print Group Cartons Limited | Manufacturing | 1997 |
| Pro Print Group Labels Limited | Manufacturing | 1998 |
| Pro Print Group Limited | Administrative & support | 2015 |
| Pro-Active Asbestos Control Ltd | Construction | 2007 |
| Pro-Tech Roofing&Building Limited | Construction | 2025 |
| Procurement E-Software Implementation Ltd | Information & communication | 2021 |
| Proelectric Services Ltd | Construction | 2026 |
| Professional Locums Ltd | Administrative & support | 2012 |
| Profile Kitchens Ltd | Construction | 2019 |
| Profitable Marketing Limited | Professional & scientific | 2014 |
| Progressive Precision Engineering Limited | Professional & scientific | 2018 |
| Progressive Recovery Care (PRC) Group Ltd | Health & social care | 2024 |
| Project Re:Claim LLP | | 2023 |
| Project Success Limited | Information & communication | 2003 |
| Project Success Services Limited | Professional & scientific | 2015 |
| Projectional Ltd | Financial services | 2015 |
| Promade Interior Ltd | Manufacturing | 2025 |
| Prominent Homes Limited | Real estate | 2014 |
| Proof by Contradiction Limited | Information & communication | 2015 |
| Prop-Manage.Com LLP | | 2009 |
| Prop-Search.Com (Northampton & Milton Keynes) Limited | Real estate | 2012 |
| Prop-Search.Com (Northampton & MK) LLP | | 2012 |
| Prop-Search.Com Limited | Real estate | 2009 |
| Propack Film UK Limited | Wholesale & retail | 2006 |
| Propcare Contractors Ltd | Construction | 2019 |
| Propertivo Ltd | Real estate | 2026 |
| Property Angels Management Services Limited | Real estate | 2009 |
| Property Clean Solutions Ltd | Administrative & support | 2025 |
| Property Expert Limited | Financial services | 2010 |
| Propjam Ltd | Real estate | 2024 |
| Propryot Ltd | Construction | 2020 |
| Provident Homes Mill Road Ltd | Construction | 2019 |
| Prudential Property Management Ltd | Real estate | 2014 |
| Pryp Services Ltd | Construction | 2014 |
| Pulpat Limited | Wholesale & retail | 2019 |
| Puma Machinery Ltd | Manufacturing | 2022 |
| Pump & Package Limited | Wholesale & retail | 1987 |
| Pure Blend CAD CAM Services Ltd | Professional & scientific | 2020 |
| Pure Magic Industries Limited | Extraterritorial | 1997 |
| Purely Packaging Online Limited | Administrative & support | 2023 |
| Purewave Cleaning Ltd | Administrative & support | 2026 |
| Puri Capital Ltd | Real estate | 2026 |
| Purple Heart Print Ltd | Manufacturing | 2016 |
| Puzzle Talent LLP | | 2020 |
| Puzzled Limited | Health & social care | 2025 |
| PVL Distribution Limited | Transport & logistics | 2019 |
| PVM Solutions Ltd | Information & communication | 2024 |
| PW Hills Limited | Real estate | 2019 |
| Pwtelkom Ltd | Transport & logistics | 2017 |
| Pynard Limited | Information & communication | 2018 |
| Pyrah & Bowers Limited | Agriculture & fishing | 1961 |
| Pyrah (Doddington) Limited | Extraterritorial | 1965 |
| Pyrford Marina Limited | Real estate | 1998 |
| Pytchley Holdings Ltd | Financial services | 2022 |
| Pytchley Investments Ltd | Real estate | 2022 |
| PZ Trading Solutions Ltd | Construction | 2023 |
| PZC Limited | Education | 2023 |
| Q Construction Group Limited | Construction | 2025 |
| Qamiish Ltd | Wholesale & retail | 2024 |
| QBA Interiors Ltd | Construction | 2014 |
| Qbee Nails Ltd | Other services | 2024 |
| Qbiotyx Limited | Professional & scientific | 2017 |
| QE Services Limited | Health & social care | 2018 |
| QNQ Logistics Ltd | Transport & logistics | 2022 |
| QS Freelance Ltd | Professional & scientific | 2004 |
| QSS Consulting Limited | Information & communication | 2024 |
| Qualitorque Ltd | Wholesale & retail | 2022 |
| Quality Carpets Limited | Construction | 2019 |
| Quality Craftsmanship Group Limited | Construction | 2025 |
| Quan Hoang Limited | Professional & scientific | 2012 |
| Quay Topco Limited | Financial services | 2022 |
| Quayevis and Associates Limited | Health & social care | 2025 |
| Qube Ideas & Promo Solutions Ltd | Information & communication | 2019 |
| QUE SGH Limited | Health & social care | 2026 |
| Queen Aesthetics by Jade Limited | Other services | 2022 |
| Queens Road (Wollaston) Management Company Limited | Real estate | 2011 |
| Quickly Drive Ltd | Education | 2024 |
| Quietly Ltd | Information & communication | 2026 |
| Quill Wills Associates Limited | Professional & scientific | 2025 |
| Quintus Partners Ltd | Financial services | 2026 |
| Quorn 1964 Limited | Extraterritorial | 2013 |
| R & a CAD Bureau Limited | Information & communication | 2015 |
| R & M Just Pizza Limited | Hospitality | 2023 |
| R C Agri Repairs Ltd | Manufacturing | 2022 |
| R Evolve Systems Ltd | Construction | 2025 |
| R Gibbs Transport Ltd | Transport & logistics | 2025 |
| R Jones Groundworks Ltd | Construction | 2021 |
| R M Crick Construction Limited | Construction | 2016 |
| R M L Engineering Limited | Manufacturing | 1998 |
| R N Property Partnership LLP | | 2013 |
| R Property Developments Ltd | Real estate | 2022 |
| R Thompson & Co Ltd | Professional & scientific | 1995 |
| R Trips & Catering Ltd | Transport & logistics | 2018 |
| R&E Car Design Ltd | Manufacturing | 2016 |
| R&G Cars Ltd | Wholesale & retail | 2020 |
| R&Mg Holdings Limited | Financial services | 2023 |
| R&V Store Ltd | Professional & scientific | 2019 |
| R&W Property Management Ltd | Real estate | 2025 |
| R.Curtis Mechanic Ltd | Professional & scientific | 2023 |