| Orpheus Mind Technologies Limited | Professional & scientific | 2019 |
| Osmer Building (Hampshire) Limited | Construction | 2003 |
| Ostlers Yard Limited | Real estate | 2016 |
| Otherenterprises Ltd | Professional & scientific | 2026 |
| Outlaw Consulting LLP | | 2009 |
| OWL Private Office Holdings Limited | Administrative & support | 2015 |
| Owngold Limited | Households | 1983 |
| P & J Romans Ltd | Construction | 2018 |
| P & N Property Investment Ltd | Real estate | 2024 |
| P D B Builders Ltd | Construction | 2014 |
| P D Perryman Limited | Administrative & support | 2002 |
| P.J.Card & Son,Limited | Manufacturing | 1952 |
| PA Desk Limited | Information & communication | 2015 |
| Paact Limited | Professional & scientific | 2018 |
| Pablo & Teo's Ltd | Hospitality | 2021 |
| Pacaya Consulting Ltd | Professional & scientific | 2011 |
| Pacific Records London Ltd | Information & communication | 2021 |
| Padel Pro Shop Limited | Wholesale & retail | 2024 |
| Padelsystems Ltd | Construction | 2023 |
| Papaya Communications Limited | Professional & scientific | 2025 |
| Papa’S Bakery Ltd | Wholesale & retail | 2025 |
| Parvathi Ltd | Wholesale & retail | 2024 |
| Paul Billett Ltd | Health & social care | 2024 |
| Pbnj Socials Ltd | Professional & scientific | 2023 |
| PDM Engineering Consultancy Ltd | Professional & scientific | 2014 |
| Pearl Promotions Limited | Manufacturing | 2017 |
| Pearson Engineering Consulting Limited | Professional & scientific | 2015 |
| Pebbles Coffee Limited | Hospitality | 2024 |
| Peers for the Planet Ltd | Professional & scientific | 2019 |
| Pella Williams-Duff Consulting Limited | Other services | 2024 |
| Pellow Industries Ltd | Real estate | 2020 |
| Pembark Ltd | Real estate | 2005 |
| Pemberley Events Ltd | Professional & scientific | 2017 |
| Pembury Webb Limited | Real estate | 2021 |
| Penny's Mill Limited | Manufacturing | 2016 |
| Pentimax Film Ltd | Information & communication | 2023 |
| People Against Poverty | Health & social care | 2003 |
| People Business Psychology Ltd. | Professional & scientific | 2012 |
| Perfect Circle Management Limited | Professional & scientific | 2004 |
| Perola Developments Ltd | Construction | 2019 |
| Pet Rebellion Limited | Wholesale & retail | 2009 |
| Photonsens Limited | Professional & scientific | 2015 |
| Pickle PEA Garden Services Limited | Administrative & support | 2022 |
| Pink Fish Associates Ltd | Information & communication | 2014 |
| Pinnacle Renewables Ltd | Construction | 2026 |
| Pitch House Media Ltd | Professional & scientific | 2025 |
| PJM Security Services Limited | Financial services | 2003 |
| PJS Homes Limited | Construction | 2025 |
| PK Contractors Limited | Construction | 1999 |
| PKA Architects Ltd | Professional & scientific | 2013 |
| PL Vacuum Pack Solutions Limited | Manufacturing | 2010 |
| Plain Insights Ltd | Information & communication | 2023 |
| Plain Investing Ltd | Financial services | 2020 |
| Plain Music Ltd | Arts & recreation | 2025 |
| Planks Storage Ltd | Real estate | 2023 |
| Planned Roots Limited | Administrative & support | 1996 |
| Poly Boutique International Trading Ltd | Wholesale & retail | 2025 |
| Portfolio Management Consulting (PMC) Ltd | Professional & scientific | 2019 |
| Potterne Cricket Club Limited | Arts & recreation | 2014 |
| Pound Court Management Company Limited | Households | 1988 |
| Power UP Electrics Ltd | Manufacturing | 2013 |
| Powis Square Pictures Limited | Information & communication | 2017 |
| Prich Consultancy Limited | Professional & scientific | 2015 |
| Primacyleads Ltd | Professional & scientific | 2026 |
| Primal Grace Ltd | Education | 2025 |
| Prints, Perks and Presents Ltd | Wholesale & retail | 2026 |
| Professional Books Ltd | Wholesale & retail | 2010 |
| Professional Bookshops Ltd | Extraterritorial | 2018 |
| Project Upstream UK Ltd | Professional & scientific | 2025 |
| Prometheus Drone Shows Limited | Arts & recreation | 2023 |
| Properflow Heating & Plumbing Ltd | Construction | 2025 |
| Property 2022 Ltd | Real estate | 2022 |
| Property Heaven Limited | Real estate | 2016 |
| PRW Project Solutions Limited | Professional & scientific | 2023 |
| PS Properties (Southwest) Limited | Real estate | 2011 |
| Psyq Consulting Limited | Professional & scientific | 2025 |
| Puckshipton Farms Limited | Agriculture & fishing | 2008 |
| Pulse Inspection Technologies Limited | Professional & scientific | 2014 |
| Purnells Dairy Limited | Agriculture & fishing | 2025 |
| PW Plumbing and Heating Devizes Limited | Construction | 2021 |
| Pyroquip Ltd | Manufacturing | 2026 |
| PYT Property Limited | Real estate | 2007 |
| Quintarix Ltd | Information & communication | 2024 |
| Quirrel Ltd | Professional & scientific | 2012 |
| R & M Takeaway Foods Ltd Ltd | Hospitality | 2026 |
| R & T Harris Limited | Construction | 2006 |
| R Hopkins Accountancy & Taxation Services Limited | Professional & scientific | 2007 |
| R Hunt Limited | Professional & scientific | 2017 |
| R J Monk Properties Ltd | Real estate | 2023 |
| R Linsley Ltd | Construction | 2017 |
| R Monk Properties Limited | Real estate | 2023 |
| R.J.Leighfield & Sons,Limited | Construction | 1930 |
| Radian Tools Ltd | Wholesale & retail | 2010 |
| Ragnarok Competitions Ltd | Arts & recreation | 2021 |
| Rally Padel Club Ltd | Arts & recreation | 2025 |
| Rayner Flint Limited | Hospitality | 2004 |
| RCC Town Planning Consultancy Limited | Professional & scientific | 2011 |
| Reactre Ltd | Information & communication | 2014 |
| Real Estate Direct Ltd | Real estate | 2014 |
| Real Hope Care Ltd | Health & social care | 2025 |