| Original Gravity Limited | Professional & scientific | 2007 |
| Orin Fragrances Ltd | Wholesale & retail | 2026 |
| Orlach Design Limited | Professional & scientific | 2018 |
| Orphean Limited | Information & communication | 2026 |
| OS Snowdonia Holidays Caravan Ltd | Hospitality | 2022 |
| OS Studios CLO Ltd | Wholesale & retail | 2023 |
| Osborne Court (Farnborough) Limited | Households | 1967 |
| Oscar CS Ltd. | Wholesale & retail | 2008 |
| Osheen Beauty Limited | Other services | 2016 |
| OSP Management Company Limited | Households | 2017 |
| Osprey Design Limited | Information & communication | 1995 |
| OSS Recruitment Ltd | Administrative & support | 2025 |
| Osteopathic Consultancy | Health & social care | 2007 |
| OT Cybersec Limited | Information & communication | 2024 |
| Otabe Ltd | Hospitality | 2011 |
| Ottawa Drive Freeholders Limited | Households | 2005 |
| Otto Accountancy Ltd | Professional & scientific | 2024 |
| OUR Future Lets Limited | Real estate | 2024 |
| OUR Home From Home Limited | Hospitality | 2025 |
| OUT of the Woods Brew Co Ltd | Manufacturing | 2018 |
| Outlook Property Limited | Real estate | 2001 |
| Overdean Associates Limited | Information & communication | 2006 |
| Overworld Limited | Information & communication | 2015 |
| Ovuk Ltd | Transport & logistics | 2026 |
| Owen Daniels Consultancy Ltd | Administrative & support | 2011 |
| OWV Developments Ltd | Construction | 2023 |
| Oxford Brighton Children's Aesthetic Education Promotion Centre Ltd | Education | 2018 |
| Oxford Writers' House Ltd | Education | 2024 |
| Ozabor Consult Limited | Health & social care | 2022 |
| P a Childcare Ltd | Other services | 2006 |
| P a H Carpentry & Joinery Ltd | Manufacturing | 2017 |
| P Sandhu Ltd | Professional & scientific | 2019 |
| P&Bms Property Lettings Ltd | Real estate | 2026 |
| P.J & W Plumbing & Heating Contracts Ltd | Construction | 1998 |
| P.J.P. Precision Engineering Limited | Professional & scientific | 1989 |
| P.W. Woodfinishing Limited | Manufacturing | 2002 |
| P2P Recruitment Limited | Administrative & support | 2019 |
| P3B Solutions Ltd | Professional & scientific | 2017 |
| PA Dove Solutions Ltd | Professional & scientific | 2022 |
| Paapi Limited | Information & communication | 2023 |
| Packer Ltd | Professional & scientific | 2023 |
| Packers Properties Ltd | Real estate | 2025 |
| Paddimac Rainwear Limited | Wholesale & retail | 2006 |
| Page Roofing Surrey Limited | Construction | 2023 |
| Pakistanis Overseas Legal Services Ltd | Professional & scientific | 2024 |
| Pala Consulting Ltd | Professional & scientific | 2011 |
| Palace Court (Woking) Management Company Limited | Households | 1991 |
| Palace Enterprise Holdings Limited | Real estate | 2026 |
| Pale Pebble Ltd | Extraterritorial | 2006 |
| Palermo Court RTM Company Limited | Households | 2021 |
| Pallindrome Limited | Construction | 2015 |
| Palm Oasis Properties Limited | Professional & scientific | 2004 |
| Pamela Jane Bridal Boutique Ltd | Wholesale & retail | 2018 |
| Panache Investments Limited | Real estate | 1976 |
| Panand Management Limited | Professional & scientific | 2009 |
| Panatonic Ltd | Education | 2017 |
| Panda Supply Education Ltd | Administrative & support | 2024 |
| Pandr Group Limited | Real estate | 2020 |
| Pangborn Recruitment Limited | Information & communication | 2024 |
| Pantheum Ltd | Wholesale & retail | 2017 |
| Papillon Talent Strategy Limited | Administrative & support | 2018 |
| PAR Excellence PR Limited | Professional & scientific | 2018 |
| Paradise Height Homes Limited | Real estate | 2016 |
| Paradox Digital Surrey Limited | Information & communication | 2024 |
| Parallel Planning Ltd | Financial services | 2026 |
| Pareece Ltd | Health & social care | 2022 |
| Paris Laundry Systems Limited | Extraterritorial | 2008 |
| Parity Media Ltd | Information & communication | 2025 |
| Park Place Residents Driveway Access Limited | Administrative & support | 2002 |
| Parkgate (Bagshot) Management Company Limited | Households | 1995 |
| Parkgate House Limited | Construction | 1987 |
| Parkhill Management Company (Esher) Limited | Households | 2004 |
| Parklands Country Homes Limited | Real estate | 2004 |
| Parkways Resident Association Limited | Households | 1982 |
| Pars Care Services Ltd | Health & social care | 2025 |
| Parsons Property Services Ltd | Construction | 2021 |
| Partwade Ltd | Hospitality | 2016 |
| Party UK Nepal Limited | Arts & recreation | 2010 |
| Pasadena Roof Orchestra 2012 Ltd. | Arts & recreation | 2012 |
| Pascali Limited | Professional & scientific | 2013 |
| Paskpartnership Ltd | Administrative & support | 2009 |
| Passfield Mews Management Company Limited | Households | 2006 |
| Passionate About Fish Limited | Wholesale & retail | 2005 |
| Pateman Information Management Limited | Administrative & support | 2022 |
| Pathways of Being Ltd | Manufacturing | 2025 |
| Patjay Professional Services Limited | Professional & scientific | 2017 |
| Paton Capital Limited | Professional & scientific | 2010 |
| Paton Developments Limited | Construction | 1993 |
| Patscome Properties Ltd | Real estate | 2024 |
| Pattison James Associates Financial Planning Ltd | Financial services | 2013 |
| Pattison James Associates Ltd | Other services | 2013 |
| Pattni Performance Ltd | Wholesale & retail | 2026 |
| Paul Abraham Cricket Coaching Limited | Arts & recreation | 2015 |
| Paul Cooper & Sons Limited | Wholesale & retail | 2004 |
| Paul Male Associates Limited | Professional & scientific | 2011 |
| Paul&Sofia's Limited | Transport & logistics | 2024 |
| Pauseaestheticsandwellnessstudio Ltd | Other services | 2023 |
| Pavli Group Ltd | Wholesale & retail | 2024 |
| Pawadise Day Care Ltd | Other services | 2024 |
| Pawadise Limited | Other services | 2022 |