| Padco Limited | Real estate | 1962 |
| Painting Songs Ltd | Information & communication | 2019 |
| Panda Designs Ltd | Wholesale & retail | 2015 |
| Paper Productions Limited | Information & communication | 2020 |
| Paragon Public Relations Ltd | Professional & scientific | 2016 |
| Parlance Marketing Services Ltd | Professional & scientific | 2022 |
| Paul Goodge Associates Limited | Professional & scientific | 2010 |
| Paul Howard Ltd | Agriculture & fishing | 2024 |
| Paul Sharland Roofing Limited | Construction | 2002 |
| Pavey Talbot Consultants Limited | Professional & scientific | 2024 |
| Payferret Ltd | Professional & scientific | 2024 |
| PC & Mobile Doctor Limited | Wholesale & retail | 2022 |
| Peer Technology Limited | Information & communication | 2016 |
| Pegasus Sport Aviation Ltd | Manufacturing | 2019 |
| Pemberton Barclay Limited | Administrative & support | 2002 |
| Penderel Partners Limited | Professional & scientific | 1990 |
| Pengwern Property Co. Limited(The) | Real estate | 1951 |
| Pension Leads Online Ltd | Professional & scientific | 2012 |
| Performance Fulfillment Limited | Manufacturing | 2020 |
| Performanze Ltd | Arts & recreation | 2016 |
| Perrins & Sons Ltd | Wholesale & retail | 2020 |
| Peter Leach Limited | Professional & scientific | 2021 |
| Petronius Conor LLP | | 2025 |
| Petrus Breeding Investments Limited | Agriculture & fishing | 2018 |
| PH Strategy Limited | Other services | 2016 |
| Phoenix Motorcycles Limited | Wholesale & retail | 2007 |
| Piccadilly Events Ltd | Arts & recreation | 2020 |
| Pino's Ristorante Limited | Hospitality | 2003 |
| PIX and Mortar Limited | Professional & scientific | 2013 |
| Pixel Love Limited | Other services | 2011 |
| Plasticdots Ltd | Information & communication | 2014 |
| Plate Expectations Ltd | Hospitality | 2024 |
| Playtime Pioneers Ltd | Wholesale & retail | 2025 |
| Plough Public House Ltd | Hospitality | 2019 |
| Plum (UK) Limited | Other services | 2001 |
| Plummer Properties Ltd | Households | 2025 |
| Podium Dent Removal Ltd | Wholesale & retail | 2024 |
| Polar Ice Creamery Ltd | Information & communication | 2023 |
| Polesitter Group Ltd | Manufacturing | 2018 |
| Porters Metals & Skip Hire Limited | Water & waste | 2000 |
| Portfoliobuilder Limited | Financial services | 2005 |
| Possamai Ltd | Real estate | 2023 |
| Potamii Ltd | Construction | 2009 |
| Power of the PEN Ltd | Arts & recreation | 2017 |
| PPC Construction (Swindon) Limited | Construction | 2015 |
| PR Custom Joinery Ltd | Manufacturing | 2024 |
| Presleys Barbershop Limited | Other services | 2025 |
| Primary Care Consultancy Limited | Construction | 2015 |
| Primegate Properties (Blunsdon) Limited | Real estate | 2005 |
| Primegate Properties (Hooknorth) Limited | Real estate | 2009 |
| Primegate Properties (Hooksouth) Limited | Real estate | 2009 |
| Primegate Properties (Kingsdown) Limited | Real estate | 2010 |
| Primegate Properties (Marlborough) Limited | Real estate | 2017 |
| Printex Ltd | Manufacturing | 2021 |
| Prise Developments Limited | Real estate | 2016 |
| Pristine Life Sciences (UK) Company Limited | Agriculture & fishing | 2020 |
| Probate Specialist Limited | Professional & scientific | 2020 |
| Probuild Transport Systems Limited | Manufacturing | 2004 |
| Procon Limited | Agriculture & fishing | 2000 |
| Profile One Construction Limited | Construction | 2017 |
| Profile One Developments Limited | Real estate | 2024 |
| Profilepros Limited | Professional & scientific | 2025 |
| Profound Insight Limited | Administrative & support | 2012 |
| Property Consultecon Ltd | Real estate | 2024 |
| Proximal Consulting Limited | Administrative & support | 2006 |
| PS ABI Stores Ltd | Wholesale & retail | 2025 |
| Pudas Consulting Limited | Information & communication | 2015 |
| Puretech Solutions Limited | Information & communication | 2010 |
| Purpleline Consulting Limited | Professional & scientific | 2006 |
| Puurity Limited | Manufacturing | 2022 |
| Pyramid Property Forum Limited | Financial services | 2006 |
| Queensgate Property Investments Limited | Real estate | 1953 |
| Quidem Productions Limited | Arts & recreation | 2011 |
| Quinntech Solutions Limited | Wholesale & retail | 2008 |
| Quintessential Project Services Limited | Administrative & support | 2017 |
| Quoca Ltd | Manufacturing | 2025 |
| R a Rawlings Limited | Construction | 2014 |
| R Hornby Limited | Arts & recreation | 2019 |
| R S Bailey Ltd | Construction | 2010 |
| R. E. Rowlands Limited | Extraterritorial | 2009 |
| R. Hannon Limited | Agriculture & fishing | 1983 |
| R.A. Rawlings and Sons Limited | Construction | 1977 |
| R.J. Lampard & Co. Ltd. | Water & waste | 1974 |
| Radish Loves Rhubarb Ltd | Manufacturing | 2011 |
| Rain International Ltd | Professional & scientific | 2021 |
| Rainbow Procurement Limited | Professional & scientific | 2013 |
| RAM Period Property Ltd | Construction | 2015 |
| Ramair Filters Limited | Manufacturing | 2011 |
| Ramsbury Estates Limited | Agriculture & fishing | 1997 |
| Ramsbury Village Shop Limited | Wholesale & retail | 2023 |
| RAW Planning Ltd | Professional & scientific | 2019 |
| Read Property Limited | Other services | 2014 |
| Real Alpine Limited | Information & communication | 2015 |
| Rebecca Garforth Designs Ltd | Arts & recreation | 2019 |
| Rebecca Tovey Associates Ltd | Professional & scientific | 2008 |
| Red House Farm (Lincs) Limited | Agriculture & fishing | 2025 |
| Red Momentum Limited | Financial services | 2026 |
| Redgeorge Ltd | Hospitality | 2019 |
| Redman Investments Ltd | Financial services | 2022 |
| Redsquid TV Ltd | Information & communication | 2024 |