| ON the Level Property Services Ltd | Construction | 2004 |
| Onward Consulting Limited | Information & communication | 2025 |
| Optima Executive Limited | Construction | 2017 |
| Orchard Holme Developments Ltd | Construction | 2026 |
| Origami Innovations Limited | Professional & scientific | 2023 |
| Original Trainer Limited | Wholesale & retail | 2025 |
| Oschora Limited | Construction | 2003 |
| Ostiario Limited | Real estate | 2015 |
| Ouldsco Limited | Construction | 2002 |
| OUR First PUB Ltd | Hospitality | 2016 |
| Outdoor Cleaning Solutions Limited | Administrative & support | 2025 |
| Outside the Box Construction Ltd | Construction | 2018 |
| Oxborough Broad Ltd | Real estate | 2015 |
| Oyster Meadow Residents Management Company Limited | Households | 2017 |
| P & D Foams and Furniture Limited | Manufacturing | 2011 |
| P Guide Limited | Information & communication | 2006 |
| P J Cook Developments Limited | Construction | 2011 |
| P J Mastics Ltd | Administrative & support | 2010 |
| P T Agricultural Services Ltd | Agriculture & fishing | 2026 |
| P. Neeve Plumbing & Heating Ltd | Construction | 2012 |
| P@Ds (East) Limited | Real estate | 2015 |
| Paddock Maintenance Limited | Construction | 2018 |
| Palisade Risk Management Ltd | Professional & scientific | 2025 |
| Pallet Worx's Dereham Ltd | Manufacturing | 2025 |
| Paragon Resource Solutions Ltd | Administrative & support | 2021 |
| Paragon Venture Partners Ltd | Financial services | 2026 |
| Parfitt Close (Foxley) Management Company Limited | Households | 2021 |
| Parfitts Laurels Norfolk Ltd | Wholesale & retail | 2022 |
| Patrick Baker Ltd | Construction | 2017 |
| Paul Hicks Brickwork Limited | Construction | 2021 |
| Paul Southgate Electrical Installations Ltd. | Manufacturing | 2015 |
| Paul's Cycles (Holdings) Limited | Financial services | 2013 |
| Paws Go RAW Ltd | Wholesale & retail | 2024 |
| Pawsh Dogs Ltd | Professional & scientific | 2020 |
| PB Leisure Services Ltd | Hospitality | 2019 |
| PCS Renewables Ltd | Professional & scientific | 2024 |
| PEA Green Bookkeeping Ltd | Professional & scientific | 2022 |
| Peacock Maintenance Engineering Ltd | Manufacturing | 2020 |
| Peartree Property and Lettings Ltd | Real estate | 2022 |
| Pedd Holdings Limited | Real estate | 2023 |
| Pekan Limited | Administrative & support | 2019 |
| Peldon Kitchens Ltd | Manufacturing | 2012 |
| Pellamay Properties (Dereham) Limited | Real estate | 2015 |
| Pellamay Property Limited | Real estate | 2013 |
| Peter S. Bendall (Taxation Consultants) Limited | Professional & scientific | 2000 |
| Peter Tatchell Foundation | Education | 2011 |
| PHO Property Limited | Real estate | 2020 |
| Phoenix Hair and Beauty Clinic Ltd | Transport & logistics | 2024 |
| PHP Commerce Ltd | Wholesale & retail | 2026 |
| Picadoo Limited | Manufacturing | 2021 |
| Picasso Inns Limited | Hospitality | 2009 |
| Pink Lizard Promotions Ltd | Professional & scientific | 2013 |
| Pinky Plant Services Limited | Wholesale & retail | 2014 |
| Pixel Pure Ltd | Information & communication | 2024 |
| Pixelate Ltd | Professional & scientific | 2023 |
| Pixies & Sprites Limited | Arts & recreation | 2015 |
| Pjcs Woodcock Investments Ltd | Real estate | 2014 |
| PJM Agri Ltd | Agriculture & fishing | 2020 |
| PJM Reavey Limited | Transport & logistics | 2014 |
| Plantech Independent Limited | Financial services | 2000 |
| Platinum People Recruitment Ltd | Administrative & support | 2022 |
| Plextech Services Ltd | Manufacturing | 2023 |
| Plotland Limited | Construction | 1991 |
| Plumia Ltd | Other services | 2024 |
| Plummer Electrical Limited | Manufacturing | 2012 |
| PMA Electrical (UK) Limited | Construction | 2008 |
| PNP 2000 Ltd | Real estate | 2012 |
| Polar CAP Marketing Ltd | Professional & scientific | 2025 |
| Portubras Limited | Wholesale & retail | 2010 |
| Post Mill Developments Limited | Construction | 2008 |
| POT Pourrium Limited | Wholesale & retail | 2010 |
| Potton Hall Ltd | Information & communication | 2014 |
| Potton Hall Spa Limited | Health & social care | 2020 |
| Power-Medix Ltd | Construction | 2022 |
| Pregnant SP Ltd | Education | 2022 |
| Premier Pallet Systems Limited | Wholesale & retail | 1993 |
| Prentice Plumbing & Heating Ltd | Construction | 2014 |
| Prestedge Enterprises Ltd | Information & communication | 2013 |
| Prestige Automotive Services Ltd | Wholesale & retail | 2020 |
| Prestige Cleaners Limited | Administrative & support | 2022 |
| Prime Eden Limited | Wholesale & retail | 2026 |
| Prime Investment Holdings Ltd | Financial services | 2026 |
| Primeshipper Ltd | Wholesale & retail | 2025 |
| Primesparks Ltd | Administrative & support | 2024 |
| Primrose Hill Studio Ltd | Arts & recreation | 2004 |
| Print Ventures Limited | Construction | 2014 |
| Printing Rubbish Limited | Manufacturing | 2018 |
| Private Medical Secretaries (Taverham) Limited | Administrative & support | 2005 |
| Pro Bar Limited | Construction | 2008 |
| Pro CUT Barbers Dereham Ltd | Other services | 2023 |
| Pro-Found Recruitment Solutions Ltd | Administrative & support | 2021 |
| Pro-Wills Limited | Professional & scientific | 2013 |
| Proactive Staff Ltd | Administrative & support | 2023 |
| Production Sparks Ltd | Construction | 2021 |
| Professional Poultry Solutions Limited | Agriculture & fishing | 2010 |
| Prospect Properties Holding UK Limited | Real estate | 2021 |
| Prosports Holdings Limited | Other services | 2020 |
| Protect My Appliances Ltd | Financial services | 2018 |
| Provit Ltd | Administrative & support | 2024 |
| PS Leisure Services Ltd | Hospitality | 2022 |