| Oliver-Taylor Ltd | Public administration | 2023 |
| Onsite Analysis Limited | Information & communication | 2006 |
| Onyx Design & Build Limited | Extraterritorial | 2023 |
| Onyx Surveying Limited | Professional & scientific | 2023 |
| Orbican Ltd | Administrative & support | 2017 |
| Oreham Vehicle Upholstery Ltd | Wholesale & retail | 2021 |
| OTC Touring Limited | Information & communication | 2026 |
| OUT and About Campers Ltd | Wholesale & retail | 2016 |
| OUT and About Poptops Ltd | Extraterritorial | 2022 |
| P & S Autos Limited | Real estate | 2009 |
| P and R Services (Sussex) Limited | Construction | 2010 |
| P Camburn Plumbing & Heating Services Ltd | Construction | 2024 |
| Padelxelite Limited | Wholesale & retail | 2026 |
| Paradox Performance Limited | Professional & scientific | 2024 |
| Partridge Green Motorsport Ltd | Wholesale & retail | 2024 |
| PAT Turnbull Ltd | Health & social care | 2002 |
| Pazu Property Ltd | Real estate | 2025 |
| Pear & Partridge Ltd. | Administrative & support | 2001 |
| Pentland Poultry Farm Ltd | Agriculture & fishing | 2009 |
| Perfect Bathroom Solutions Limited | Wholesale & retail | 2010 |
| Pergentium Limited | Professional & scientific | 2008 |
| Pet-Id UK Limited | Other services | 2001 |
| Peter Samuel Stone Flooring Ltd | Construction | 2015 |
| PGM Consultancy Group Ltd | Professional & scientific | 2018 |
| Phoenix Properties (Patcham) Limited | Real estate | 2007 |
| Pilates Evolved Ltd | Other services | 2013 |
| Pilates Evolved Matwork Studios Limited | Arts & recreation | 2025 |
| Pinks Hair Salon Limited | Other services | 2012 |
| Pols Piece Development Limited | Construction | 2021 |
| Poppet Properties Ltd | Extraterritorial | 2023 |
| Port Solent Properties Limited | Extraterritorial | 2008 |
| Portal 21 Limited | Real estate | 2024 |
| Post House Cafe Limited | Hospitality | 2019 |
| Predict in Teams Ltd | Information & communication | 2019 |
| Premier Aqua UK Limited | Water & waste | 2009 |
| Premier Global Group Ltd | Water & waste | 2011 |
| Premier Live Bands Ltd | Professional & scientific | 2025 |
| Premier Managed Technologies Holdings Ltd | Other services | 2021 |
| Premier Office (UK) Limited | Administrative & support | 1994 |
| Premier Software & Development Ltd | Wholesale & retail | 2020 |
| Prestige Auto Valeting Limited | Wholesale & retail | 2016 |
| Priorscope Limited | Information & communication | 1989 |
| Pro Audio Marketing Limited | Professional & scientific | 2015 |
| Pro-Am Sport Horses Limited | Extraterritorial | 2011 |
| Pro-Link Distribution Limited | Wholesale & retail | 2023 |
| Project Management on Demand Limited | Professional & scientific | 2010 |
| PROPERTY2026 Ltd | Real estate | 2026 |
| Propylon Ltd | Real estate | 2023 |
| Protecht Consultants Ltd | Information & communication | 2024 |
| Protecht Technologies Ltd | Professional & scientific | 2025 |
| Purple Sage Ltd | Education | 2022 |
| Pyramid Technical Consultants Europe Ltd | Information & communication | 2003 |
| Q-Surgical Ltd | Wholesale & retail | 2008 |
| QP Pipe Collars Limited | Manufacturing | 2013 |
| Quantum-Surveyors (Sussex) Ltd | Professional & scientific | 2016 |
| R & B Landscaping Ltd | Administrative & support | 2021 |
| R Business Limited | Professional & scientific | 1998 |
| R Business Properties LLP | | 2016 |
| Rallyfm Limited | Information & communication | 2009 |
| Ralph James Holdings Ltd | Real estate | 2021 |
| Rassanad | Real estate | 2024 |
| Ravello Aviation Ltd | Transport & logistics | 2024 |
| RCL Family Office Limited | Financial services | 2024 |
| Real World Coaching Ltd | Professional & scientific | 2021 |
| Rebecca Decorative Designs Limited | Manufacturing | 2008 |
| Recserv Ltd | Administrative & support | 2018 |
| Red Dragon Dispense Ltd | Wholesale & retail | 1993 |
| Red Dragon Holdings Limited | Financial services | 2023 |
| Red Dragon Soft Drinks Ltd | Wholesale & retail | 2015 |
| Red Maple Investments Limited | Construction | 1972 |
| Red Zone Holdings Limited | Financial services | 2021 |
| Reflex Imaging Ltd | Professional & scientific | 2013 |
| Restoren Ltd | Professional & scientific | 2024 |
| Revolver Creative Limited | Professional & scientific | 2014 |
| RHC Properties Ltd | Real estate | 2022 |
| Richard Price Consulting Ltd | Professional & scientific | 2018 |
| Right Formula Productions Limited | Information & communication | 2003 |
| Rightcola Ltd | Wholesale & retail | 2016 |
| RJ Holden Consulting Limited | Professional & scientific | 2025 |
| RJC Detailing Limited | Administrative & support | 2022 |
| RJH Excavation Ltd | Construction | 2023 |
| RM Long Limited | Professional & scientific | 2012 |
| RNR Training & Coaching Limited | Professional & scientific | 2003 |
| Roasted Coffee Ltd | Hospitality | 2006 |
| Robert Whitaker Equestrian Limited | Arts & recreation | 2018 |
| Rose Building Services Limited | Construction | 1998 |
| Roseguard Trading Limited | Administrative & support | 2012 |
| Rowanmead Limited | Construction | 1978 |
| RPMC72 Limited | Professional & scientific | 2015 |
| RPS Retail Ltd | Wholesale & retail | 2020 |
| RSI Scaffolding Limited | Construction | 2014 |
| RSX Financial Services Ltd | Financial services | 2025 |
| RTS Financial Ltd | Financial services | 2016 |
| S & R Philips Ltd | Real estate | 2022 |
| S. Cannon Catering Ltd | Hospitality | 2024 |
| Saddlers Meadow Property Management Company Limited | Households | 1996 |
| Sahara Tanning Salons Shoreham Limited | Extraterritorial | 2017 |
| SAM Equities Ltd | Extraterritorial | 2022 |
| Sandrajs Ltd | Administrative & support | 2024 |
| Sardrew Ltd | Other services | 2018 |