| Onur Limited | Hospitality | 2024 |
| Onyx Communications Limited | Information & communication | 2020 |
| Ooper Case Type Limited | Professional & scientific | 2025 |
| OPA Pension Trustees Limited | Professional & scientific | 1982 |
| Opal Aesthetics Gosport Limited | Other services | 2025 |
| Opas Group Ltd | Wholesale & retail | 2018 |
| Opass Group Ltd | Wholesale & retail | 2021 |
| Open Circuit Solutions Ltd | Construction | 2026 |
| Openswift Limited | Information & communication | 2021 |
| Orbit Environmental Ltd | Wholesale & retail | 1987 |
| Ordnance Park Management Company Limited | Other services | 2004 |
| Oriental Express Zhang Take Away Ltd | Hospitality | 2021 |
| Orooti Ltd | Manufacturing | 2025 |
| Oshaughnessy Brawn Limited | Real estate | 2024 |
| Oskar Barber Ltd | Other services | 2024 |
| Outright IT Limited | Information & communication | 2024 |
| Oven Cleaning Solutions Made Simple Ltd | Administrative & support | 2019 |
| Owen Asset Finance Limited | Financial services | 2009 |
| OZ Tech Harvesting Ltd | Professional & scientific | 2024 |
| P and J Furnishings Ltd | Wholesale & retail | 2026 |
| P Francis Consultancy Ltd | Construction | 2019 |
| P&C Hylands Community Ventures Ltd | Hospitality | 2026 |
| P&J Boat Builder Ltd | Professional & scientific | 2022 |
| P&J’S Food Wholesale & Distribution Ltd | Wholesale & retail | 2020 |
| PAA Automation Ltd | Professional & scientific | 2025 |
| Pace Invaders Ltd | Wholesale & retail | 2026 |
| Pagefix Limited | Information & communication | 2007 |
| Pagvo Limited | Real estate | 1997 |
| Paintworld Limited | Manufacturing | 2020 |
| Palantir Financial Planning Ltd | Administrative & support | 2013 |
| Palma Marine Invest Limited | Transport & logistics | 2004 |
| Palmer House Freeholders Ltd | Households | 2022 |
| Palmerston Windows and Doors Ltd | Construction | 2025 |
| PAM Potter Counselling Limited | Health & social care | 2018 |
| Pamplebadger Ltd | Information & communication | 2025 |
| Papi GAS Ltd | Construction | 2025 |
| Parade Chinese Takeaway Limited | Hospitality | 1995 |
| Paradigmshiftstudio Limited | Professional & scientific | 2023 |
| Parceljet Technology Limited | Transport & logistics | 2022 |
| Parish Equity Limited | Administrative & support | 2017 |
| Park Place Patisserie Limited | Hospitality | 2022 |
| Parnell Trading Ltd | Other services | 2010 |
| Part X Motors Limited | Wholesale & retail | 2013 |
| PAS1 Property Ltd | Real estate | 2026 |
| Pass Electronis Ltd | Manufacturing | 2025 |
| Paul Freeman Tree Services Limited | Administrative & support | 2019 |
| Paul Shawyer Painter and Decorator Ltd | Construction | 2010 |
| Pauls Garage Services Gosport Ltd | Wholesale & retail | 2017 |
| Pauper to a Gentleman Limited | Other services | 2017 |
| Pawel Makuchowski Transport Limited | Transport & logistics | 2014 |
| PB Fabrication & Mechanical Services Limited | Manufacturing | 2013 |
| Peach Publications Limited | Information & communication | 2016 |
| Pearce Construction Limited | Administrative & support | 2014 |
| Pearl Management Consultancy Limited | Administrative & support | 2019 |
| Peel Common Residents Association Limited | Other services | 2009 |
| Pegasus Draughting Services Limited | Administrative & support | 2014 |
| Pemavo Ltd | Wholesale & retail | 2018 |
| Pendine Motors Limited | Manufacturing | 2014 |
| Pendragon Digital Ltd | Information & communication | 2025 |
| Penny Court (Gosport) Management Limited | Households | 2005 |
| Pepsco Ltd | Administrative & support | 2010 |
| Perfect Cremation Limited | Other services | 2022 |
| Perfect Pavers Ltd | Construction | 2025 |
| Perfectly Crisp Ltd. | Manufacturing | 2022 |
| Perform 365 Wellbeing Ltd | Wholesale & retail | 2009 |
| Perplexity Marine Limited | Professional & scientific | 2013 |
| Pete Ford Stunts Limited | Arts & recreation | 2015 |
| Peters Marine Boat Services Ltd | Manufacturing | 2022 |
| Petranella Limited | Real estate | 2025 |
| Petscanner Limited | Information & communication | 2018 |
| PFF Properties Southern Limited | Real estate | 2024 |
| PG & KS Property Ltd | Real estate | 2020 |
| PGSCPUBS1 Limited | Hospitality | 2024 |
| PH Hampshire Consulting Limited | Professional & scientific | 2021 |
| Phillips and Edgworth Limited | Wholesale & retail | 2011 |
| Phillips Building Contractors Ltd | Construction | 2023 |
| Phillips Holdings Group Ltd | Financial services | 2026 |
| Phillips Integrated Group Ltd | Construction | 2026 |
| Phoenix Advanced Flight Training Ltd | Arts & recreation | 2019 |
| Phoenix Bakery and Cafe Ltd | Wholesale & retail | 2022 |
| Phoenix Cars Gosport Ltd | Transport & logistics | 2023 |
| Phoenix Engineering Group Ltd | Construction | 2023 |
| Phoenix Frozen Foods Limited | Hospitality | 2011 |
| Phoenix Heating Solutions Ltd | Construction | 2017 |
| Pinra Limited | Hospitality | 2025 |
| Pipe & Flame Ltd | Construction | 2025 |
| Piston Pulse UK Ltd | Wholesale & retail | 2025 |
| Pitney OPS Ltd | Manufacturing | 2026 |
| PJE Property Maintenance & Renovation Ltd | Construction | 2023 |
| PJG Property Limited | Real estate | 2021 |
| Pkhc IT Services Ltd | Information & communication | 2025 |
| PKM Cards Ltd | Wholesale & retail | 2024 |
| Plasticoat GB Limited | Manufacturing | 1998 |
| Platinum Sport Horses Ltd | Agriculture & fishing | 2018 |
| Playzi Ltd | Wholesale & retail | 2025 |
| Pleasant Surroundings Ltd | Construction | 2021 |
| Plumbright Southern Limited | Construction | 2006 |
| Plushy Pals Ltd | Manufacturing | 2024 |
| Plymport Limited | Real estate | 2021 |
| PNA Recruitment Ltd | Other services | 2023 |