| Private Company Registrars Limited | Professional & scientific | 1991 |
| Professional Weed Solutions Limited | Professional & scientific | 2007 |
| Prospect Wells House Ltd | Construction | 2018 |
| Prospect Wells Management Company Limited | Households | 2025 |
| Pulsar Measuring Systems Limited | Mining & quarrying | 1988 |
| Quantum Data Analytics Limited | Administrative & support | 2016 |
| Quasur Ltd | Professional & scientific | 2017 |
| Queens Walk Flats (Brighton) Limited | Households | 1979 |
| R & F Emerson LLP | | 2012 |
| R & GM Property Investments Ltd | Real estate | 2025 |
| Race Tickets Ltd | Arts & recreation | 2022 |
| Raging Bear Interactive Ltd | Information & communication | 2025 |
| RAH Advisory (UK) Ltd | Real estate | 2013 |
| Rail Commercial Services Ltd | Construction | 2026 |
| Ramblebank Management Co. Limited | Households | 1977 |
| Ramsec Holdings Limited | Financial services | 2022 |
| Ramsec Limited | Administrative & support | 2017 |
| Ravenscroft Court Management Company Limited | Households | 1979 |
| Real CSR Ltd | Education | 2020 |
| Recruit in Energy Ltd | Information & communication | 2020 |
| Reef Property Development Ltd | Real estate | 2019 |
| Regeneration: Intelligent Inspiration Ltd | Other services | 2009 |
| REH Properties Limited | Real estate | 2026 |
| Rendco Rendering Ltd | Construction | 2012 |
| Reoferm Limited | Construction | 1975 |
| Repainted Painting & Property Maintenance Ltd | Construction | 2022 |
| Resultant Success Ltd | Professional & scientific | 2023 |
| Revolve Digital Solutions Limited | Information & communication | 2001 |
| Rewilding Britain (CTC) Limited | Administrative & support | 2024 |
| RFB Homes Ltd | Real estate | 2025 |
| Rich Meredith Health & Safety Limited | Administrative & support | 2025 |
| Rima House Ltd | Manufacturing | 2025 |
| Riovanti Limited | Financial services | 2022 |
| Rising Sun UB Ltd | Hospitality | 2019 |
| Riten the Advantage Ltd | Administrative & support | 2025 |
| River Research Limited | Professional & scientific | 2008 |
| River Roofing Ltd | Construction | 2025 |
| RK Plastering and Decorating Ltd | Construction | 2024 |
| RLA Building Services Limited | Professional & scientific | 2023 |
| Robertsons Automotive Ltd | Wholesale & retail | 2024 |
| Robotechnics Ltd | Manufacturing | 2025 |
| Roccia Limited Liability Partnership | | 2008 |
| Rock Common Limited | Real estate | 2021 |
| Rodway Planning Consultancy Limited | Professional & scientific | 2016 |
| Roffey Management Company Limited | Households | 1987 |
| Rohoco Ltd | Financial services | 2019 |
| Route 6 Ltd | Wholesale & retail | 2009 |
| Roxyco Limited | Hospitality | 2001 |
| RT Commercial Energy Consultants Limited | Mining & quarrying | 2016 |
| Rupert Taylor Limited | Agriculture & fishing | 1992 |
| Russell New Limited | Other services | 2002 |
| Ruxley Court Management Company Limited | Households | 1994 |
| S&D Fulking Limited | Hospitality | 2022 |
| S.E.C. Properties (Spain) Limited | Real estate | 2002 |
| Safety and Environmental Consultancy Limited | Administrative & support | 2009 |
| Salamander Developments Limited | Real estate | 2016 |
| Salamander Group Limited | Financial services | 2016 |
| Salamander Properties Limited | Real estate | 2016 |
| Salt Superyachts Ltd | Other services | 2017 |
| Salvage Publications Ltd | Information & communication | 2014 |
| Sapion Innovations Limited | Professional & scientific | 2025 |
| Sasrm Ltd | Information & communication | 2025 |
| Saxtead Livestock Ltd | Agriculture & fishing | 2012 |
| SBS Consultancy Limited | Professional & scientific | 2020 |
| Schofield Watch Company Limited | Manufacturing | 2011 |
| Scog Ltd | Hospitality | 2023 |
| Scoopcastle Limited | Real estate | 1989 |
| Scott-Mccoll Limited | Information & communication | 1997 |
| Senate GP Ltd | Professional & scientific | 2024 |
| Senate Grand Prix Limited | Administrative & support | 2015 |
| Senate Logistics Limited | Professional & scientific | 2018 |
| Sendall Residents Association Limited | Households | 1984 |
| Sensai Solutions Ltd | Information & communication | 2025 |
| Seriously Good Productions Ltd | Arts & recreation | 2023 |
| Seven Ormonde Gate Limited | Households | 1980 |
| SG Legal Consulting Ltd | Professional & scientific | 2022 |
| SG Music Ltd | Information & communication | 2023 |
| SG Townhouse Company Limited | Real estate | 2018 |
| SG Villas Limited | Real estate | 2016 |
| Shark Claw Books Limited | Information & communication | 2017 |
| Shava Smart Limited | Construction | 2020 |
| Sheila Coates Foundation | Education | 2018 |
| Shone Creative Ltd | Professional & scientific | 2011 |
| Shore Ride Ltd | Manufacturing | 2016 |
| Shrimp Cocktail Limited | Administrative & support | 2017 |
| Silvergrass Consultants Management Limited | Professional & scientific | 2022 |
| Sivalis Group Ltd | Wholesale & retail | 2024 |
| SJE Services Limited | Professional & scientific | 2005 |
| SKI Miles Chalets Limited | Administrative & support | 2023 |
| SMH Groundworks Ltd | Construction | 2021 |
| Smiley Management Limited | Real estate | 2014 |
| SNM Cars Limited | Wholesale & retail | 2015 |
| SOE Congresses Limited | Administrative & support | 2019 |
| SOO Media Limited | Arts & recreation | 2025 |
| Sorted-It (UK) Limited | Information & communication | 2014 |
| Southdowns Insurance Services Limited | Financial services | 2010 |
| Southern Transit BUS Company Limited | Transport & logistics | 2013 |
| Southern Transport Services Ltd | Transport & logistics | 2025 |
| Spanish Court (Burgess Hill) Residents Association Limited | Households | 1961 |
| Sparky Investments Ltd | Financial services | 2022 |