| Otium Wine Estate Ltd | Hospitality | 2024 |
| Otter Aviation Limited | Professional & scientific | 1983 |
| Outdoor Scene Camping & Leisure Ltd | Wholesale & retail | 2005 |
| Outright Media Ltd | Information & communication | 2020 |
| Overbury Interiors Limited | Professional & scientific | 2011 |
| Oversite Contractors Ltd | Construction | 2018 |
| Owen Flowers Limited | Agriculture & fishing | 2026 |
| Ownfull Limited | Agriculture & fishing | 1960 |
| Owro Limited | Arts & recreation | 2021 |
| Oxcad Ltd | Professional & scientific | 2021 |
| Oxford (T) Hairdressing Limited | Other services | 1994 |
| Oxygen Change Consulting Limited | Professional & scientific | 2016 |
| P COX Letting Ltd | Real estate | 2016 |
| P R Aerials Limited | Information & communication | 2018 |
| P S Building Contractors Ltd | Construction | 2010 |
| P Taylor Joinery Ltd | Manufacturing | 2013 |
| P Thorn Ltd | Education | 2019 |
| P&T Interiors Ltd | Construction | 2016 |
| P. Boast & SON Limited | Other services | 1998 |
| P2F Ventures Limited | Professional & scientific | 2012 |
| P3RSONAS Ltd | Information & communication | 2024 |
| PA Homes Group Ltd | Real estate | 2021 |
| PA Place Ltd | Real estate | 2024 |
| Paget and Partners Ltd | Professional & scientific | 2023 |
| Pallet Tech Ltd | Wholesale & retail | 2025 |
| Panelox Systems Ltd | Construction | 2022 |
| Pangea Project Management Limited | Construction | 2024 |
| Paper Hatch Financial Planning Ltd | Professional & scientific | 2026 |
| Paperclip Creative Limited | Arts & recreation | 2014 |
| PAR 72 Performance Limited | Arts & recreation | 2025 |
| Paradigm Communication Systems Limited | Information & communication | 1997 |
| Paradigm Property Investments Limited | Real estate | 2001 |
| Park Hands Limited | Health & social care | 2025 |
| Parker's Post Ltd | Other services | 2023 |
| Parnell Medical Limited | Health & social care | 2020 |
| Pashley Design Services Limited | Other services | 2007 |
| Paul Harris (Contracts) Limited | Construction | 2009 |
| Paul Lanzante Limited | Wholesale & retail | 2012 |
| Paul Smith Associates (Media Consultants) Limited | Administrative & support | 2003 |
| Pawfect Pooch Limited | Other services | 2018 |
| Paws 4 Walkies Limited | Other services | 2018 |
| Pawsable Assistance Dogs C.I.C. | Professional & scientific | 2017 |
| Pebble Systems Limited | Information & communication | 1994 |
| Pegasus Financial Solutions Ltd | Financial services | 2021 |
| Peggotty Ltd | Professional & scientific | 2025 |
| Pekkk Group Limited | Construction | 2020 |
| Pelgar International Limited | Manufacturing | 1995 |
| Pelgen Limited | Financial services | 2015 |
| Pelham Publications Limited | Professional & scientific | 2007 |
| Pelican Post | Administrative & support | 2011 |
| Pembury Farm Limited | Manufacturing | 2002 |
| Penstock Mews (Flats Management) Limited | Real estate | 2010 |
| People and Technology for Success (PTS) Limited | Professional & scientific | 2016 |
| Pequot Ltd | Construction | 2013 |
| Perception AV Limited | Construction | 2008 |
| Peregrine MLS Ltd | Manufacturing | 2018 |
| Pernix Health Ltd | Education | 2020 |
| Perry Way Management Company Limited | Households | 2018 |
| Persistence of Vision Productions Limited | Information & communication | 2003 |
| Perspective Holdings Ltd | Real estate | 2020 |
| Pest Contract Services Ltd | Agriculture & fishing | 2025 |
| Pet Consultant Limited | Professional & scientific | 2013 |
| Peter Munro Ltd | Professional & scientific | 2021 |
| Peterborough (T) Hairdressing Limited | Other services | 2018 |
| Petersfield Road Management Co Ltd | Water & waste | 1997 |
| Petfence Limited | Administrative & support | 2006 |
| Petrotechnical Data Systems Limited | Information & communication | 1993 |
| Petworth Homes Limited | Real estate | 2019 |
| Phaeon Marketing Services Limited | Wholesale & retail | 1999 |
| Pharma Bird Ltd | Wholesale & retail | 2022 |
| Pharmautomation Ltd | Other services | 2020 |
| Pharmingcare Ltd | Wholesale & retail | 2025 |
| Pharmyar Ltd | Wholesale & retail | 2018 |
| Phase Barbers Ltd. | Other services | 2022 |
| Phase INK Ltd. | Other services | 2023 |
| Phoenix Company Consultants Ltd | Professional & scientific | 2023 |
| Phoenix ERP Solutions Ltd | Information & communication | 2008 |
| Phoenix Pubs (Chawton) Limited | Hospitality | 2024 |
| Physical Project Limited | Health & social care | 2011 |
| Picante Design Limited | Manufacturing | 2023 |
| Picklebook Limited | Information & communication | 2025 |
| Pickron Ltd | Wholesale & retail | 2024 |
| Piddinghoe Farms Limited | Agriculture & fishing | 2026 |
| Piers Collins Interiors Limited | Wholesale & retail | 2000 |
| Piers John Richardson Consulting Limited | Information & communication | 2009 |
| Pilcher Consulting Services Limited | Professional & scientific | 2020 |
| Pillar Information & Design Limited | Arts & recreation | 1996 |
| Pinder Construction Ltd | Construction | 2014 |
| Pine Court Management (Four Marks) Limited | Households | 2014 |
| Pink Fish Creative Ltd | Extraterritorial | 2020 |
| Pink Noise Events Limited | Administrative & support | 2019 |
| Pink Tape Publishing Limited | Information & communication | 2024 |
| Pinkman Limited | Real estate | 2014 |
| Pipeline Heating Limited | Construction | 2019 |
| Pitch Aircraft Seating Systems Limited | Manufacturing | 2010 |
| Pixelstring Limited | Information & communication | 2014 |
| Pixelwave Limited | Wholesale & retail | 2025 |
| Pixieacre Limited | Construction | 1997 |
| PJM Services Ltd | Construction | 2022 |
| PLA Design Limited | Wholesale & retail | 2017 |