| Oyster Quay Shoreham Limited | Households | 2016 |
| O’Reilly Rails Ltd | Wholesale & retail | 2023 |
| P J Agricultural Services Limited | Agriculture & fishing | 2013 |
| Pacalis Construction Limited | Construction | 2016 |
| Paine Contractors Limited | Construction | 2005 |
| Pallant Homes Limited | Construction | 2013 |
| Pappardelle LLP | | 2014 |
| Parkers Foodservice Ltd | Wholesale & retail | 2016 |
| Parkers Property Investments Ltd | Real estate | 2019 |
| Patchman Ltd | Wholesale & retail | 2026 |
| Pathway Consultancy Limited | Professional & scientific | 2023 |
| Paving Site Limited | Administrative & support | 2023 |
| Pawsitivity Dog Daycare & Boarding Ltd | Agriculture & fishing | 2022 |
| PB Marine Electrics Limited | Manufacturing | 2004 |
| Pearl Management (Aldwick) Limited | Households | 2017 |
| Pebble Lane Management Limited | Households | 2022 |
| Pegasus Properties (Arundel) Limited | Extraterritorial | 2018 |
| Pennycrest Residents Association Limited | Households | 1991 |
| Percy Beck Solar Farm Limited | Energy | 2020 |
| Peter Pitman Limited | Agriculture & fishing | 2005 |
| Pevensey Garden (Worthing) Limited | Households | 1991 |
| Phase Protection Ltd | Professional & scientific | 2023 |
| Philippa Barton Ltd | Professional & scientific | 2009 |
| Philippa Barton Property Limited | Extraterritorial | 2020 |
| Phoenix Detailing Limited | Wholesale & retail | 2024 |
| Photovoltaic Consulting Ltd | Professional & scientific | 2020 |
| Pilates Body Europe Limited | Arts & recreation | 2009 |
| Pillar Construction Management Limited | Professional & scientific | 2024 |
| Pinecrest Housing Limited | Construction | 2024 |
| Pink Chilli Software Ltd | Information & communication | 2019 |
| Pipeflow Utilities Ltd | Construction | 2019 |
| Planet Hygienic Cladding Limited | Construction | 2022 |
| Pocket Rockets West Sussex & Brighton Limited | Administrative & support | 2026 |
| Poling Professional Services Limited | Professional & scientific | 2015 |
| Pothill Generation Hub Limited | Energy | 2023 |
| Precision Neuro Ltd | Health & social care | 2025 |
| Premier Nursing Limited | Administrative & support | 2006 |
| Print Sector Limited | Professional & scientific | 2022 |
| Priyas Properties Limited | Real estate | 2016 |
| Progreso Limited | Real estate | 2017 |
| Property Consultants Society Limited(The) | Other services | 1954 |
| Protozoon Limited | Information & communication | 1998 |
| Provident Housing Management CIC | Households | 2025 |
| Puresmoke Limited | Manufacturing | 2013 |
| Pynham Crescent Residents Management Company Limited | Households | 2021 |
| Quarters Property Limited | Real estate | 2017 |
| R C L Promotions Limited | Arts & recreation | 1984 |
| RAF Composites Limited | Other services | 2015 |
| Ramconsult Limited | Professional & scientific | 2019 |
| Random R Delivery Ltd | Transport & logistics | 2019 |
| Ratefreak Ltd | Information & communication | 2015 |
| RAV Business Solutions Limited | Real estate | 2011 |
| Ravenwood Court Management Limited | Households | 1987 |
| Raving Rascals Ltd | Arts & recreation | 2025 |
| RAY Hole Architects Ltd | Professional & scientific | 2004 |
| Rectory Meadow (Plumpton Green) Residents Management Company Ltd | Households | 2023 |
| Red Ridges Limited | Households | 1988 |
| Redcotts Management (Worthing) Limited | Households | 1987 |
| Redstone (Tyres) Ltd | Wholesale & retail | 2015 |
| Redstone Investments Ltd | Financial services | 2026 |
| Redwell Associates Limited | Professional & scientific | 2003 |
| Regnum Blinds Limited | Wholesale & retail | 2007 |
| Reliva Ltd | Wholesale & retail | 2024 |
| Rescue 2 Limited | Public administration | 2012 |
| Respire Limited | Professional & scientific | 2000 |
| Restoration & Innovation Limited | Other services | 2009 |
| Retailzo Ltd | Wholesale & retail | 2023 |
| Revive Maintenance Ltd | Administrative & support | 2022 |
| RGM Joinery (Sussex) Ltd | Construction | 2011 |
| Richard Cooper Projects Limited | Professional & scientific | 2008 |
| Richard Goss Data Services.Ltd Limited | Professional & scientific | 2025 |
| Richard Moore Tree Surgery Limited | Administrative & support | 2016 |
| Richmond Gate (Chichester) Management Company Limited | Households | 2006 |
| Richmond House Chichester Limited | Households | 2016 |
| Richmond Park Management Company (Chichester) Limited | Households | 1997 |
| Rife Lodges Motorhome Hire Ltd | Administrative & support | 2025 |
| River of Peaches Ltd | Hospitality | 2025 |
| ROB Hunter Ltd | Professional & scientific | 2014 |
| ROC Staffing Ltd | Administrative & support | 2025 |
| Rococo Digital Ltd | Information & communication | 2018 |
| Romana Management Company Limited | Households | 2018 |
| Rosarcbim Ltd | Information & communication | 2024 |
| Round House Property Ltd | Real estate | 2026 |
| Ruby & BO Limited | Manufacturing | 2020 |
| Rudford Garage Ltd | Wholesale & retail | 2026 |
| Rugs and Stuff Ltd | Wholesale & retail | 2022 |
| Runclub App Ltd | Information & communication | 2025 |
| S a Construction Co Limited | Construction | 1977 |
| S and G Fontwell Ltd | Wholesale & retail | 2021 |
| S Hedger Properties Ltd | Real estate | 2026 |
| Sabre Automotive Group UK Ltd | Manufacturing | 2014 |
| Safeguarding and Education Ltd | Education | 2025 |
| Salthouse Investment Limited | Extraterritorial | 2013 |
| Samim Global Money Transfer Services Ltd | Financial services | 2026 |
| Sanctuaries for Humanity Ltd | Hospitality | 2024 |
| Sander Ltd. | Information & communication | 2013 |
| Sandy Barber Ltd | Other services | 2021 |
| SCALE42 Cloud Ltd | Information & communication | 2024 |
| Scientaire Dust Control Limited | | 1977 |
| Scott Buckley Lighting Services Limited | Arts & recreation | 2018 |