| Ouse & Adur Rivers Trust | Professional & scientific | 1999 |
| Outdoor Camera Ltd | Professional & scientific | 2026 |
| Outsource Medical Limited | Manufacturing | 2025 |
| Overbecks Interior Contractors Limited | Construction | 2009 |
| Oversal Limited | Extraterritorial | 2010 |
| Overseas Golf Properties Ltd | Real estate | 2018 |
| Owens Insight Limited | Financial services | 2010 |
| Page & Grimes Limited | Other services | 1988 |
| Paperseven Ltd | Information & communication | 2011 |
| Papillon Advice Limited | Professional & scientific | 2026 |
| Parasola Ltd | Information & communication | 2019 |
| Parkflight Ltd | Administrative & support | 2022 |
| Parmis Sabz (UK) Limited | Administrative & support | 2020 |
| Patchworksuk Ltd | Wholesale & retail | 2019 |
| Patterson Portfolio Limited | Real estate | 2018 |
| Paul Earl Holdings Limited | Financial services | 2025 |
| Paul Read Photography Ltd | Professional & scientific | 2023 |
| Paul Russell Carpentry Ltd | Construction | 2014 |
| Paul Winkley Limited | Health & social care | 2008 |
| PBM Technical Services Ltd | Wholesale & retail | 2016 |
| Pbully Training Ltd | Education | 2020 |
| PCP Oven Services Ltd | Manufacturing | 2019 |
| PD Solutions Limited | Other services | 2017 |
| PDH Cars Sussex Limited | Professional & scientific | 2014 |
| PE Development Ltd | Education | 2014 |
| Peaky Paws Ltd | Other services | 2025 |
| Peep Festival Ltd | Administrative & support | 2025 |
| Pegham Services LLP | | 2003 |
| Pembroke Holdings Limited | Real estate | 2019 |
| Pembroke Practice Ltd | Health & social care | 2010 |
| Pentacraft Limited | Manufacturing | 1996 |
| Pepper-Pot Nursery Limited | Other services | 1994 |
| Peppercorn Law Limited | Professional & scientific | 2026 |
| PER Ardua Engineering Ltd | Construction | 2018 |
| Perceptix Limited | Administrative & support | 2025 |
| Perducta Public Interest Agency Limited | Professional & scientific | 2026 |
| Perfect Periodontics Limited | Health & social care | 2022 |
| Perfect Pizza Express Ltd | Hospitality | 2014 |
| Perio Solutions Ltd | Health & social care | 2016 |
| Pet Rescue Ltd | Other services | 2025 |
| Petmaster International Limited | Extraterritorial | 2013 |
| PFM Book Keeping Services Limited | Professional & scientific | 2003 |
| Phaclem Limited | Health & social care | 2015 |
| PHB (Contractors) Henfield Limited | Construction | 2000 |
| PHX Gym BH Ltd | Arts & recreation | 2022 |
| PHX Gym Brighton Ltd | Arts & recreation | 2020 |
| PHX Gym Crawley Ltd | Arts & recreation | 2026 |
| PHX Gym Hove Limited | Arts & recreation | 2024 |
| PHX Gym Ltd | Arts & recreation | 2019 |
| PHX Gym Witham Ltd | Arts & recreation | 2023 |
| Pickled and Board Limited | Hospitality | 2024 |
| Pickled Events Limited | Hospitality | 2019 |
| Pidge Productions Limited | Information & communication | 2023 |
| Pier View Holdings Ltd | Real estate | 2026 |
| Piglet Limited | Real estate | 2014 |
| Pirouz Holding Limited | Real estate | 2024 |
| PJE Design Tech Ltd | Professional & scientific | 2025 |
| Planet Exquisite Ltd | Health & social care | 2020 |
| Planet Technology Group Limited | Information & communication | 2023 |
| Planet Technology Limited | Information & communication | 2023 |
| Plantbooth Ltd | Wholesale & retail | 2025 |
| Plough Henfield Ltd | Hospitality | 2023 |
| PMB Group Limited | Information & communication | 2018 |
| PNL Accountants & Advisors Ltd | Professional & scientific | 2023 |
| Point Nine One Ltd | Financial services | 2017 |
| Polka DOT Interiors LLP | | 2008 |
| Pony Parties Sussex Ltd | Arts & recreation | 2018 |
| POOL365 Ltd | Wholesale & retail | 2020 |
| Poponin Ltd | Arts & recreation | 2019 |
| Portcullis TV Ltd | Information & communication | 2012 |
| Posh Threads Boutique Ltd | Wholesale & retail | 2014 |
| PPM Consultancy Services Ltd | Professional & scientific | 2026 |
| Prana Coaching Limited | Other services | 2019 |
| Prestige Auto Tech Limited | Wholesale & retail | 2007 |
| Priestfield Securities Limited | Administrative & support | 2000 |
| Prime Plumbing and Heating (Sussex) Ltd | Construction | 2025 |
| Prior Media and Marketing Limited | Professional & scientific | 2023 |
| Privy Services Limited | Arts & recreation | 2025 |
| Pro-Insight Surveying Ltd | Professional & scientific | 2024 |
| Pro-Pulse Strategies Ltd | Professional & scientific | 2023 |
| Procars Limited | Wholesale & retail | 2015 |
| Producthuddle Ltd | Information & communication | 2019 |
| Promo Finance Ltd | Financial services | 2020 |
| Proper Cycling Limited | Wholesale & retail | 2012 |
| Pull & Pour Ltd | Hospitality | 2025 |
| Pulse Cardiology Group Ltd | Health & social care | 2019 |
| Pure Elixir Ltd | Wholesale & retail | 2014 |
| Purple Catering Ltd | Hospitality | 2022 |
| PW Wine Bars Ltd | Hospitality | 2017 |
| Qbridge Limited | Manufacturing | 2025 |
| QD Stationery and Services Ltd | Wholesale & retail | 2011 |
| Quaff 2 Limited | Wholesale & retail | 2010 |
| Quaff Fine Wine Merchant Ltd. | Wholesale & retail | 2005 |
| Quality Drycleaners Ltd | Other services | 2001 |
| R & B Dent Ltd | Health & social care | 2014 |
| R a Strange Properties Limited | Real estate | 2025 |
| R.B.I. International Limited | Construction | 1990 |
| Rachad Estates Ltd | Real estate | 2022 |
| Ralph Keast Consultancy Limited | Arts & recreation | 2014 |
| Ramin Oral Care Ltd | Health & social care | 2024 |