| NPP PR58 Limited | Real estate | 2024 |
| NPP PR59 Limited | Real estate | 2024 |
| NPP PR60 Limited | Real estate | 2024 |
| NPP PR61 Limited | Real estate | 2025 |
| NPP PR62 Limited | Real estate | 2025 |
| NPP PR63 Limited | Real estate | 2025 |
| NPP PR64 Limited | Real estate | 2025 |
| NPP PR65 Limited | Real estate | 2025 |
| NPP PR66 Limited | Real estate | 2025 |
| NPP PR67 Limited | Real estate | 2025 |
| NPP PR68 Limited | Real estate | 2025 |
| NPP PR69 Limited | Real estate | 2025 |
| NPP PR70 Limited | Real estate | 2025 |
| NPP PR8 Limited | Real estate | 2022 |
| NPP RF1 Limited | Real estate | 2023 |
| NPP RF2 Limited | Other services | 2025 |
| NSM UK Limited | Wholesale & retail | 2001 |
| Number 38 the Limes Limited | Households | 1999 |
| NWS Enterprises Ltd | Real estate | 2004 |
| O'Sullivan Plasterers Ltd | Construction | 2014 |
| O. N. S. Contractors Limited | Construction | 2003 |
| Oak Tree Cabins Ltd | Hospitality | 2025 |
| Oak Tree Hideaway WFH Ltd | Administrative & support | 2025 |
| OAK8 Consultancy Limited | Professional & scientific | 2026 |
| OAK8 Holdings Limited | Financial services | 2026 |
| OAK8 Ltd | Real estate | 2022 |
| Oakmill Construction Ltd | Construction | 2025 |
| Oakridge Real Estate Ltd | Real estate | 2025 |
| OK Wines & Spirits Ltd. | Wholesale & retail | 2015 |
| Old Hall Management Company Limited | Households | 2023 |
| Oliver Maggs Ltd | Information & communication | 2013 |
| Ollerton Park Farm Limited | Wholesale & retail | 2016 |
| Omega Window Films Ltd | Construction | 1995 |
| OMP Electrical Limited | Construction | 2023 |
| Oort Energy Ltd | Professional & scientific | 2021 |
| OPI Trans 2019 Ltd | Transport & logistics | 2019 |
| Opportunity Windows Limited | Construction | 2025 |
| Orange Monkey Automotive Limited | Wholesale & retail | 2021 |
| Orchard Improvement Limited | Professional & scientific | 2018 |
| Original Media Ltd | Professional & scientific | 2019 |
| Osmonds INT. Limited | Extraterritorial | 1999 |
| Osmonds Limited | Professional & scientific | 1992 |
| Osprey Electrical Limited | Construction | 2009 |
| Osprey Marine Limited | Wholesale & retail | 1994 |
| Osullivan Consulting Ltd | Information & communication | 2024 |
| Own Front Door Limited | Real estate | 2013 |
| Oxton Propco 1 Limited | Real estate | 2025 |
| Oxton Propco 2 Limited | Real estate | 2025 |
| Oxtoncare Limited | Health & social care | 2015 |
| OZ10 Limited | Professional & scientific | 2006 |
| P & H J Site Services Limited | Construction | 1995 |
| P a Thomas (Builders) Ltd | Construction | 2016 |
| P and S Photography Limited | Other services | 2013 |
| P C Engineering Limited | Construction | 2015 |
| P&P Prime Carpentry Ltd | Manufacturing | 2023 |
| P&S Motor Services Ltd | Wholesale & retail | 2020 |
| P. G. Mullock Building Contractors Limited | Construction | 2003 |
| Padel Works Ltd | Construction | 2022 |
| Pakenham Ltd | Manufacturing | 2021 |
| Palmers Property Ltd | Real estate | 2020 |
| Pantbach Holdings Limited | Financial services | 2025 |
| Paradigm Three Limited | Professional & scientific | 2012 |
| Parkes Poole Architects Limited | Professional & scientific | 2018 |
| Parlour Tech UK Ltd | Manufacturing | 2018 |
| Pawfit Animal Physiotherapy Limited | Professional & scientific | 2025 |
| Payatlas Limited | Information & communication | 2023 |
| PC Homes Limited | Construction | 2001 |
| PCB for EMC Limited | Manufacturing | 2014 |
| PCS Isolators Limited | Wholesale & retail | 2014 |
| PDN Consulting Ltd | Information & communication | 2024 |
| PDT Construction Limited | Administrative & support | 2005 |
| PEA Green Boats Whixall Limited | Extraterritorial | 2004 |
| Peach Property (NW) Limited | Households | 2018 |
| Peep App Ltd | Arts & recreation | 2021 |
| Peerless GAS Controls Limited | Manufacturing | 1985 |
| Pegasus Court (Amenities) Limited | Construction | 1989 |
| Penley Mill LLP | | 2012 |
| Penn Hill Holdings Ltd | Transport & logistics | 2025 |
| Penny Turner Limited | Professional & scientific | 2006 |
| Percy's Cafe Bar Limited | Hospitality | 2015 |
| Performance Edge Remaps Limited | Wholesale & retail | 2019 |
| Perpetuum Motor Sport Ltd | Arts & recreation | 2022 |
| Person Centred Services Limited | Health & social care | 2010 |
| Petcetera ETC. Limited | Wholesale & retail | 2000 |
| Petcetera International Limited | Wholesale & retail | 1998 |
| Petcetera Limited | Wholesale & retail | 2000 |
| Peter Richards & Co Limited | Professional & scientific | 2011 |
| Petra Exports Ltd | Professional & scientific | 2024 |
| Petwise Ltd | Agriculture & fishing | 2014 |
| Phan THI BE Ltd | Other services | 2025 |
| Pheasant Barn WFH Ltd | Administrative & support | 2025 |
| Phone Clinic Whitchurch Limited | Wholesale & retail | 2023 |
| Piao Kitchen Limited | Hospitality | 2023 |
| Pietra Management Services Limited | Professional & scientific | 2022 |
| Pine Lodge Cars Limited | Wholesale & retail | 2017 |
| Pinecone Associates Limited | Manufacturing | 2000 |
| Pizza Spot & Kebab Ltd | Hospitality | 2026 |
| Plain Greens Ltd | Agriculture & fishing | 2022 |
| Platinum CIS Limited | Professional & scientific | 2008 |
| Platinum Holdings (South) Ltd | Real estate | 2024 |