| One With Everything Productions Ltd | Professional & scientific | 2025 |
| Oozlum Technology Ltd | Professional & scientific | 2023 |
| Opal Engineering Ltd | Wholesale & retail | 2021 |
| Optima PM Ltd | Households | 2025 |
| Optimal Future Limited | Health & social care | 2020 |
| OPTIMALL4U Ltd | Hospitality | 2016 |
| Optimum Building Solutions Limited | Construction | 2014 |
| Option 3 Homes Ltd | Real estate | 2024 |
| Opus Renewables Southern Limited | Construction | 2024 |
| Orchard Caravan Park Limited | Hospitality | 2019 |
| Orchard Enterprises (Southern) Limited | Construction | 1995 |
| Orchard Way Management Limited | Households | 2016 |
| Orchards North END Limited | Households | 2021 |
| ORG Services Ltd | Construction | 2026 |
| Oriel Close Properties (Barnham) Limited | Households | 1964 |
| Oriel Lodge Property Limited | Real estate | 2019 |
| Oskar and Catie Ltd | Wholesale & retail | 2014 |
| OSL Transport Ltd | Transport & logistics | 2020 |
| OTS Investments Limited | Professional & scientific | 2018 |
| Otter Consulting Limited | Professional & scientific | 2024 |
| Oundle Court Limited | Real estate | 1985 |
| OUR Travels Limited | Transport & logistics | 1997 |
| Outram House Management Limited | Households | 2002 |
| Oven Support England Ltd | Administrative & support | 2021 |
| Overdrive Motors Ltd | Wholesale & retail | 2023 |
| Overton & Saunders Funeral Services Ltd | Other services | 2021 |
| Oxysoft Consultancy Limited | Information & communication | 2023 |
| Oyster Estates UK Limited | Real estate | 2007 |
| P E Sport Solutions Ltd | Arts & recreation | 2011 |
| P W Bennett Builders & Decorators Ltd | Construction | 2024 |
| P&H Coaching Limited | Professional & scientific | 2013 |
| P.C.L. Rental Limited | Professional & scientific | 1976 |
| P1 Wraps Ltd | Wholesale & retail | 2023 |
| P1TEK Limited | Information & communication | 2021 |
| Pace Property Limited | Real estate | 2013 |
| Page Bespoke Limited | Manufacturing | 2022 |
| Pagham Barber Ltd | Other services | 2025 |
| Pagham Golden Blade Ltd | Other services | 2022 |
| Pagham Hotel Limited | Hospitality | 2025 |
| Pagham Landscaping Ltd | Administrative & support | 2017 |
| Pagham Parade Residents Limited | Real estate | 1978 |
| Paintlife Sussex Ltd | Construction | 2023 |
| Palm Close Residents Association Limited | Households | 1968 |
| Palta Hospitality Consultancy Ltd | Other services | 2020 |
| Pamporovo Bognor Ltd | Wholesale & retail | 2025 |
| Pamporovo Mini Market Ltd | Wholesale & retail | 2023 |
| Panorama Rise Management Company Limited | Households | 2013 |
| Panther Maintenance and Building Ltd | Construction | 2025 |
| Paolini’S Wine & More Ltd | Wholesale & retail | 2023 |
| Paradise Property Management Ltd | Households | 2016 |
| Paragon Building and Carpentry Ltd | Construction | 2021 |
| Parapet Limited | Professional & scientific | 2012 |
| Parents and Carers Support Organisation (Pacso) | Other services | 2012 |
| Park Grove (Bedhampton) Management Limited | Households | 2014 |
| Parker's Food Machinery Plus Ltd | Wholesale & retail | 2013 |
| Parklands Property Holdings Ltd | Real estate | 2025 |
| Particle Science Ltd | Administrative & support | 2025 |
| Partners Cafe Limited | Hospitality | 2013 |
| Partners London Limited | Health & social care | 2015 |
| Passage to India (WS) Ltd | Hospitality | 2017 |
| Passivhaus Trust | Other services | 2009 |
| PAT Carey Ltd | Real estate | 2022 |
| Pathway Coaching Limited | Arts & recreation | 2021 |
| Paul Burchell Thatching Limited | Construction | 2003 |
| Pavan Retail Ltd | Wholesale & retail | 2022 |
| Pawsome Pets Sussex Ltd | Other services | 2024 |
| Payless 4 Business Lending Ltd | Information & communication | 2007 |
| Payroll and Books Ltd | Professional & scientific | 2005 |
| PBS Contractors Limited | Construction | 2020 |
| PCL Groundworks Ltd | Construction | 2019 |
| Peaceworks Limited | Administrative & support | 2015 |
| Pebbles Property Company Ltd | Real estate | 2011 |
| Pedalux Ltd | Administrative & support | 2024 |
| Pegasus Avenue Residents Management Company (Netley) Ltd | Households | 2021 |
| Pegasus Properties (Barnham) Ltd | Real estate | 2019 |
| Pembleton Holdings Limited | Hospitality | 2024 |
| Penev Cleaning Ltd | Administrative & support | 2025 |
| Penfold Scaffolding Ltd | Construction | 2023 |
| Penfolds Family Butchers Limited | Wholesale & retail | 2019 |
| Penrich Limited | Real estate | 1983 |
| Pentreath Andrew Ltd | Information & communication | 2023 |
| People First Solutions Limited | Professional & scientific | 1995 |
| Pepperblock Ltd | Real estate | 2019 |
| Pepperpot Investments Limited | Real estate | 2010 |
| Peracini Racing Limited | Wholesale & retail | 2012 |
| Peregrine Landscapes Ltd | Administrative & support | 2022 |
| Perennial Health Ltd | Wholesale & retail | 2017 |
| Performanceart.Academy Limited | Arts & recreation | 2018 |
| Perry and Buttle Inns Limited | Hospitality | 2026 |
| Pert Build Limited | Construction | 2024 |
| Petal N Pearl Ltd | Wholesale & retail | 2024 |
| Petworth Court Residents Association Ltd | Households | 2021 |
| PG. Electrical Contractor Ltd | Construction | 2014 |
| PH Cars Arundel Limited | Wholesale & retail | 2015 |
| Phillips Electrical Contractors Ltd | Construction | 2019 |
| Phoenix Court 9 Marine Drive West Limited | Administrative & support | 2012 |
| Phoenix Residential Lettings Limited | Real estate | 2024 |
| Piieu Limited | Professional & scientific | 2012 |
| Pilates Plus Southsea Limited | Arts & recreation | 2022 |
| Pilot Communications (Europe) Limited | Administrative & support | 1997 |