| Protaxium Limited | Professional & scientific | 2005 |
| Proteus Group.Es Limited | Administrative & support | 2018 |
| Provision Building & Developments Limited | Construction | 2024 |
| Provisions Bakery Ltd | Hospitality | 2024 |
| PSG Solutions Ltd | Professional & scientific | 2007 |
| Puff & Stuff Hastings Limited Ltd | Wholesale & retail | 2026 |
| Pure & Palo Ltd | Administrative & support | 2026 |
| Pure Water Window Cleaning Services Ltd | Administrative & support | 2026 |
| Purechannels Group Limited | Financial services | 2024 |
| Purechannels Limited | Professional & scientific | 2005 |
| Purotrim Solutions Limited | Administrative & support | 2025 |
| Purple Management (Sussex) Limited | Professional & scientific | 2011 |
| Push Potential Ltd | Other services | 2020 |
| Pushrod Limited | Real estate | 2019 |
| PVG Properties Limited | Real estate | 2021 |
| Qandil Market Ltd | Wholesale & retail | 2025 |
| QIB Traders Ltd | Wholesale & retail | 2021 |
| Qonek Ltd | Extraterritorial | 2025 |
| Quantis LAB Limited | Wholesale & retail | 2025 |
| Quarry Crescent RTM Company Limited | Households | 2013 |
| Queens Court Bexhill Limited | Households | 1981 |
| Quequered Flag Limited | Extraterritorial | 2012 |
| Quintella Holdings Limited | Professional & scientific | 2005 |
| R & J Limited | Wholesale & retail | 2018 |
| R & L Linwood Limited | Construction | 2024 |
| R & N Building Services (Pett) Limited | Construction | 2006 |
| R&R Building and Developments Ltd | Construction | 2024 |
| R.E. Morgan & SON Limited | Real estate | 1984 |
| R.F.Ex. Limited | Wholesale & retail | 2022 |
| R.J. Coates Plumbing & Heating Limited | Construction | 2009 |
| R.R. Tiger Limited | Wholesale & retail | 2022 |
| R2J Ltd | Hospitality | 2025 |
| Rachael Roser Ltd | Professional & scientific | 2025 |
| Racketeers Brewing Company Ltd | Manufacturing | 2025 |
| Rain (Regenerative Agroforestry Impact Network) CIC | Other services | 2019 |
| Raising the Raft CIC | Education | 2024 |
| RAM Automotive (Sussex) Limited | Transport & logistics | 2022 |
| RAM Supported Care Limited | Extraterritorial | 2022 |
| Ramco Construction Ltd | Construction | 2023 |
| Rameslie House Management Company Limited | Real estate | 2005 |
| Ramp FC Limited | Professional & scientific | 2025 |
| Ramsden Rigging Limited | Information & communication | 2020 |
| Randolph House Management Company Limited | Real estate | 1989 |
| Ranya Hastings Ltd | Wholesale & retail | 2025 |
| Rawphotographyuk Ltd | Professional & scientific | 2018 |
| Rayfield Enterprises Limited | Real estate | 2019 |
| Rbyte Engineering Services Ltd | Wholesale & retail | 2026 |
| RCL Property Care Ltd | Administrative & support | 2026 |
| RD1 Clothing Ltd | Other services | 2021 |
| Rdaa Retail Ltd | Wholesale & retail | 2020 |
| RDL Sports Management Ltd | Education | 2019 |
| RDM Accountancy Services Ltd | Professional & scientific | 2019 |
| Real Time Testing Ltd | Information & communication | 2006 |
| Rebecca Hope Ltd | Health & social care | 2010 |
| Rebecca's Fixings Supplies Ltd | Construction | 2023 |
| Rectory Close Silverhill Residents Association Limited | Real estate | 1966 |
| Red and Purple DOT Limited | Real estate | 2020 |
| Red House Hastings Limited | Other services | 2012 |
| Red Lion Publishing Services Limited | Information & communication | 2014 |
| Red Square Financial Services Limited | Professional & scientific | 2022 |
| Redbag Consulting Ltd | Professional & scientific | 2013 |
| Redbrave Limited | Real estate | 2018 |
| Redfield Property Limited | Real estate | 2026 |
| Redi Innovations Limited | Construction | 2024 |
| REDUNDANTCO11 Ltd | Wholesale & retail | 2013 |
| Regal Nails 56 Limited | Other services | 2023 |
| Regent Capital Developments Ltd | Construction | 2025 |
| Regent Global Holdings Ltd | Financial services | 2025 |
| Regional Media Group Ltd | Information & communication | 2021 |
| Reimagine Design LLP | | 2025 |
| Relax in Harmony Limited | Other services | 2021 |
| Relocation Developments Ltd | Construction | 2025 |
| Renegade Pyrotechnics Limited | Other services | 2007 |
| Residence Holdings Limited | Real estate | 2019 |
| Residence Homes Limited | Construction | 2013 |
| Resident Broker Limited | Financial services | 2004 |
| Residential Solutions UK Limited | Construction | 2001 |
| Resolute Solutions Limited | Construction | 2009 |
| Respective Solutions Limited | Administrative & support | 2021 |
| Reste Limited | Wholesale & retail | 2019 |
| Restore Sussex Ltd | Construction | 2022 |
| RFI Film Ltd | Information & communication | 2025 |
| RGH Holdings Limited | Real estate | 2021 |
| Rgre Holdco Limited | Financial services | 2025 |
| RH Dental Laboratory Limited | Health & social care | 2013 |
| Rhema Brands Limited | Wholesale & retail | 2024 |
| Rhiannonhoare Ltd | Wholesale & retail | 2025 |
| Rhodes Contract Flooring Limited | Professional & scientific | 2013 |
| RIB Development Ltd | Construction | 2024 |
| RIB Quantum Design Ltd | Information & communication | 2025 |
| Rich Ocean Limited | Wholesale & retail | 2026 |
| Richard Sharp Construction Limited | Construction | 2026 |
| Richlu LLP | | 2024 |
| Riddelcourt Limited | Households | 1980 |
| Ridge West Garage (UK) LLP | | 2005 |
| Ridge West Garage Limited | Wholesale & retail | 1996 |
| Rinkel World Ltd | Information & communication | 2025 |
| RIO Selva Limited | Other services | 2011 |
| Risci Ltd | Hospitality | 2019 |
| Ritual Bars Limited | Hospitality | 2023 |