| Prism Media Ltd | Information & communication | 2026 |
| Prismoptics Ltd | Wholesale & retail | 2023 |
| Prisonvoicemail Ltd | Extraterritorial | 2015 |
| Pristine Bathrooms and Tile Limited | Construction | 2024 |
| Pristine Clean Norfolk Ltd | Administrative & support | 2023 |
| Pristine Cleaning (Norwich) Ltd | Administrative & support | 2025 |
| Pristine Nest Ltd | Hospitality | 2024 |
| Pristine Paving Ltd | Administrative & support | 2014 |
| Pristine Wash Norwich Ltd | Wholesale & retail | 2025 |
| Private Star Ltd | Professional & scientific | 2025 |
| Privatetown Property Management Limited | Households | 1988 |
| Prize Golf Ltd | Information & communication | 2026 |
| PRM Controls Ltd | Construction | 2015 |
| Pro Coach Sports Limited | Education | 2008 |
| Pro Heat Solutions Limited | Construction | 2014 |
| Pro Spray Norfolk Limited | Construction | 2021 |
| Pro Systems Limited | Construction | 2014 |
| Pro Toilet Co Ltd | Wholesale & retail | 2023 |
| Pro Utilities Ltd | Water & waste | 2021 |
| Pro-Com (UK) Limited | Transport & logistics | 1989 |
| Pro-Fit East Anglia Ltd | Construction | 2024 |
| Pro-Gen Research Limited | Professional & scientific | 2021 |
| Pro-Mist Ltd | Construction | 2019 |
| Pro-Mow Limited | Administrative & support | 2018 |
| Pro-Tech Solutions (Norwich) Ltd | Construction | 2020 |
| Pro/Active Consultancy Ltd | Professional & scientific | 2025 |
| Proactive Education Limited | Education | 2018 |
| Proactive Rehab Ltd | Other services | 2024 |
| Proactsis Controls Ltd | Professional & scientific | 2011 |
| Probates Online Limited | Professional & scientific | 2021 |
| Probeauty Skincare Limited | Health & social care | 2015 |
| Probuild Eastern Ltd | Construction | 2018 |
| Process 11 Limited | Administrative & support | 2016 |
| Process Excellence Solutions Ltd | Professional & scientific | 2015 |
| Process Heat Limited | Manufacturing | 2010 |
| Processive Ltd | Professional & scientific | 2025 |
| Proclaimers | Real estate | 2007 |
| Proctor Engineering Limited | Manufacturing | 2009 |
| Procurement Solutions Group Ltd | Administrative & support | 2018 |
| Procurexcel Ltd | Professional & scientific | 2015 |
| Procut Profiles UK Ltd | Manufacturing | 2020 |
| Procutz AKO Limited | Other services | 2018 |
| Prodanov Treading Service Ltd | Wholesale & retail | 2022 |
| Prodig Groundworks Limited | Construction | 2018 |
| Produce Unity (Evesham) Limited | Agriculture & fishing | 1976 |
| Product Resolutions Limited | Professional & scientific | 2000 |
| Production Bureau Limited | Information & communication | 2000 |
| Production Services Entertainment Limited | Professional & scientific | 2004 |
| Productive Solutions Limited | Information & communication | 2001 |
| Productivv Limited | Professional & scientific | 2019 |
| Proenza Home Ltd | Administrative & support | 2019 |
| Proexpert Security Ltd | Wholesale & retail | 2021 |
| Professional Accountancy Tutors LLP | | 2010 |
| Professional Beauty Approval Ltd. | Education | 2021 |
| Professional Client Solutions Limited | Professional & scientific | 1996 |
| Professional Eyecare Solutions Limited | Health & social care | 2021 |
| Professional Surface Restoration Ltd | Construction | 2021 |
| Professional Training Facilitation Ltd | Health & social care | 2010 |
| Professional Training International Limited | Professional & scientific | 1995 |
| Professional Voice Limited | Administrative & support | 2008 |
| Profile Marketing Agency Ltd | Professional & scientific | 2024 |
| Profix Consulting Ltd | Professional & scientific | 2026 |
| Profix Norfolk Limited | Construction | 2024 |
| Progoalkeeper Performance Limited | Arts & recreation | 2018 |
| Programme Management Consulting Ltd | Real estate | 1989 |
| Progresivo Limited | Information & communication | 2017 |
| Progress Fuels Ltd | Wholesale & retail | 2023 |
| Progress Physiotherapy Limited | Other services | 2025 |
| Progressive Energies Limited | Energy | 2011 |
| Progressive Property Network @ Blackfriars Ltd | Real estate | 2024 |
| Proguard Networks Ltd | Information & communication | 2024 |
| Prointa Ltd | Construction | 2019 |
| Project 313 Holdings Ltd | Financial services | 2025 |
| Project 37 Ltd | Professional & scientific | 2013 |
| Project Better Dog Ltd | Other services | 2025 |
| Project BUN Ltd | Hospitality | 2020 |
| Project BUN Ukgb Ltd | Hospitality | 2023 |
| Project FLO Holdings Ltd | Financial services | 2023 |
| Project Installs Ltd | Construction | 2016 |
| Project Management (London) Ltd | Construction | 2015 |
| Project Monday Consultancy Limited | Professional & scientific | 2017 |
| Project PPE & Workwear Ltd | Wholesale & retail | 2023 |
| Project Pretty Ltd | Arts & recreation | 2010 |
| Project Santis Alpha Bidco Ltd | Financial services | 2023 |
| Project Santis Bidco Ltd | Financial services | 2023 |
| Project Santis Deltaco Limited | Financial services | 2024 |
| Project Santis Omega Bidco Ltd | Financial services | 2023 |
| Project TLS C.I.C. | Information & communication | 2018 |
| Project Waffle Ltd | Hospitality | 2018 |
| Project-U IT Ltd | Information & communication | 2018 |
| PROJECT72 Ltd | Professional & scientific | 2023 |
| Projectorlamp-Pro Ltd | Wholesale & retail | 2008 |
| Projects 101 Limited | Professional & scientific | 2021 |
| Projects Engineering Services Limited | Professional & scientific | 2008 |
| Proklean Services Limited | Hospitality | 2026 |
| Prolean Limited | Wholesale & retail | 2023 |
| Prolec Developments Ltd | Construction | 2020 |
| Prolec East Anglia Ltd | Construction | 2018 |
| Prolet Property Services Ltd | Professional & scientific | 2012 |
| Prolife Medical Services Ltd | Health & social care | 2022 |