| Osmond Education Ltd | Education | 2023 |
| Otari Consulting Limited | Professional & scientific | 2023 |
| Otter Technologies Ltd | Information & communication | 2026 |
| Otters Home Search Limited | Real estate | 2023 |
| Otto Talenti Ltd | Financial services | 2018 |
| OUI Chef, YES Chef Limited | Hospitality | 2019 |
| OUR Door Ltd | Real estate | 2019 |
| Outhentics Consulting Limited | Professional & scientific | 2005 |
| Oval (1229) Limited | Extraterritorial | 1997 |
| OWL West Ltd | Real estate | 2024 |
| Owlda Limited | Professional & scientific | 2023 |
| Oxford Eco-Urbanism C.I.C. | Education | 2026 |
| Oxford International Holdings Limited | Administrative & support | 2016 |
| Oxford Mews Residents Management Company Limited | Real estate | 2016 |
| Oxpino Consulting Limited | Professional & scientific | 2023 |
| Oz-Uk Limited | Professional & scientific | 2015 |
| P & C Hoare Properties Limited | Real estate | 2016 |
| P & G Property Services Limited | Real estate | 2011 |
| P & P Building Services (Wiltshire) Limited | Administrative & support | 2003 |
| P J & a E Potter Ltd | Financial services | 2025 |
| P L H Designs Limited | Wholesale & retail | 2022 |
| P T Distinction Limited | Arts & recreation | 2013 |
| P&G Inns Ltd | Hospitality | 2016 |
| P&G Lettings Ltd | Real estate | 2022 |
| P&L Bookkeeping Limited | Professional & scientific | 2007 |
| P&M Oral Care Ltd | Health & social care | 2026 |
| P.H. Heilmann Artexing Limited | Construction | 2004 |
| P.H.A.B. Residents Limited | Households | 1997 |
| P.O.C. Contractors Limited | Construction | 2012 |
| P3M Hubs Limited | Professional & scientific | 2021 |
| Pacific Europa Ltd | Information & communication | 2022 |
| Pada Pada Ltd | Administrative & support | 2024 |
| Paddock Capital (SW) Limited | Construction | 2025 |
| Padel Development Solutions Limited | Real estate | 2024 |
| Palmer Land & Industry Limited | Other services | 2001 |
| Pamela Rawlins & Associates Limited | Professional & scientific | 2006 |
| Pangaea IT Ltd | Information & communication | 2018 |
| Pangea Limited | Manufacturing | 1997 |
| Parabellum Tattoo Ltd | Other services | 2025 |
| Paragon Energy Limited | Professional & scientific | 2004 |
| Parcel Dash Ltd | Transport & logistics | 2023 |
| Parcis Holdings Limited | Financial services | 2026 |
| Parcis Limited | Information & communication | 2025 |
| Pariter Investment Holdings Ltd | Financial services | 2020 |
| Park House Veterinary Centre Limited | Professional & scientific | 2017 |
| Park Lane Accountants Limited | Professional & scientific | 2006 |
| Park Lane Autos Holdings Limited | Financial services | 2024 |
| Park Lane Autos Limited | Administrative & support | 2010 |
| Park Lane Beauty Salons Limited | Other services | 2020 |
| Park Lane Practice Ltd | Health & social care | 2019 |
| Parker Bathrooms Ltd | Wholesale & retail | 2025 |
| Parkers Roofing Limited | Construction | 2023 |
| Parkfields Court (Chippenham) Management Company Limited | Hospitality | 1983 |
| Parlez Consulting Ltd | Information & communication | 2024 |
| Parnell Plumbing & Heating Limited | Construction | 2010 |
| PARTNERING2EXCEL Limited | Professional & scientific | 2021 |
| PAS Clean Group Limited | Professional & scientific | 1989 |
| Pascal Properties Limited | Financial services | 1986 |
| Pasha Properties Cheltenham Ltd | Real estate | 2022 |
| Pastel Outdoor Company Limited | Wholesale & retail | 2025 |
| Patch Heritage Group Ltd | Real estate | 2025 |
| Patterdown Farm Management Company Ltd | Real estate | 2019 |
| Paul Cottrell Double Glazing Ltd | Administrative & support | 2014 |
| Paul Cunningham Ltd | Administrative & support | 2013 |
| Paul Doust Limited | Transport & logistics | 2008 |
| Paul Stage Management Ltd | Arts & recreation | 2023 |
| Paul Tucker Limited | Administrative & support | 2005 |
| Paul Young Transport Limited | Transport & logistics | 2003 |
| Payroll Service Direct Limited | Professional & scientific | 2013 |
| PB Services (Wiltshire) Limited | Construction | 2015 |
| PCB People Ltd | Wholesale & retail | 2023 |
| PE Scholar Limited | Information & communication | 2015 |
| Peace in the Valley Limited | Health & social care | 2025 |
| Peachtree Golf Company Limited | Wholesale & retail | 2001 |
| Peacock Green Marketing Ltd | Education | 2024 |
| Pearbrook Limited | Information & communication | 2004 |
| Pearson Ford Ltd | Real estate | 2020 |
| Pebbles Travel Limited | Administrative & support | 2015 |
| Pegasus Lakeside Retreats Ltd | Real estate | 2024 |
| Pegden Contracting Limited | Construction | 2024 |
| PEN & Feather Ltd | Professional & scientific | 2019 |
| Penhale Estates Limited | Real estate | 1928 |
| Pennlogic Ltd | Information & communication | 2023 |
| Penny Property Investments Ltd | Real estate | 2023 |
| Pennys Investment Ltd | Financial services | 2024 |
| Pension Schemes Information Ltd | Financial services | 2016 |
| Pentagon Electronics Limited | Manufacturing | 1991 |
| Pentire Estate Ltd | Real estate | 2020 |
| People Connections HR Consultancy Ltd | Administrative & support | 2020 |
| People Orientated Solutions in I T Limited | Information & communication | 2003 |
| People Sorted Ltd | Administrative & support | 2022 |
| Peopleforge Ltd | Administrative & support | 2026 |
| Pepper & Seed Ltd | Professional & scientific | 2019 |
| Perceptive Logistics Limited | Transport & logistics | 2018 |
| Perfectly Maintained Limited | Other services | 2019 |
| Perflo Ltd | Professional & scientific | 2022 |
| Performance Flooring (Bath) Ltd | Construction | 2025 |
| Performance Flooring Ltd | Construction | 2022 |
| Peritum Services Ltd | Wholesale & retail | 2010 |
| Perlman Pierson Ltd | Professional & scientific | 2024 |