| Queens Quarters Affordable Letting Ltd | Households | 2025 |
| Quercus Enterprises Limited | Real estate | 1963 |
| Quite Frankly Accountants Ltd | Administrative & support | 2016 |
| Qurius Solutions Limited | Information & communication | 2023 |
| R & K Healthcare Limited | Transport & logistics | 2013 |
| R H Broadcast Services Ltd | Information & communication | 2021 |
| R I Electrical Ltd | Construction | 2016 |
| R J Perry Consulting Limited | Information & communication | 2014 |
| R Santana Holdings Limited | Real estate | 2018 |
| R Surrey Roofing Limited | Construction | 2024 |
| R Webb Property Limited | Financial services | 2024 |
| R&M Heating Services Limited | Construction | 2022 |
| R.D.B Maintenance Ltd | Manufacturing | 2025 |
| R.W.Smale & Co.Limited | Extraterritorial | 1947 |
| Raagasphere Ltd | Information & communication | 2023 |
| Raceline Limited | Manufacturing | 1989 |
| Rachel's Dairy Limited | Manufacturing | 1990 |
| Raddoc Limited | Health & social care | 2018 |
| Radiant Care Services Ltd | Health & social care | 2018 |
| Radiant Dwellings Ltd | Real estate | 2023 |
| Radioexcellence Limited | Health & social care | 2025 |
| Raffles Bathroom Installations Ltd | Construction | 2019 |
| Raffles Trading Limited | Wholesale & retail | 2011 |
| Rafters Roofing Ltd | Construction | 2024 |
| Ragamuffins Clothing Ltd | Wholesale & retail | 2025 |
| Ragnar Collection Ltd | Real estate | 2025 |
| Rags Hair Studio Limited | Other services | 2007 |
| Ralph Fire Protection Ltd | Construction | 2024 |
| Ralph James Redhill Limited | Real estate | 2015 |
| Ralph Plastering Limited | Construction | 2021 |
| Raluci Healthcare Services Ltd. | Administrative & support | 2018 |
| RAM Medicals Limited | Wholesale & retail | 2022 |
| Rama Maintenance Ltd | Construction | 2022 |
| Ramsdale Investments Ltd | Real estate | 2018 |
| Randolph Capital Limited | Professional & scientific | 2020 |
| Random Colour Animal Ltd | Professional & scientific | 2017 |
| Ranygazoo Limited | Information & communication | 2005 |
| Rapid Property Repairs Ltd | Manufacturing | 2023 |
| Rapid Response Care Team Limited | Health & social care | 2015 |
| Rapt Realty 1 Ltd | Real estate | 2019 |
| RAR Tech Solutions Ltd | Information & communication | 2025 |
| RAS Construction Limited | Administrative & support | 2009 |
| RAS Testing Solutions Limited | Information & communication | 2018 |
| Raul Construction Ltd | Construction | 2024 |
| Raven Devco Limited | Construction | 2014 |
| Raven Development Homes Limited | Construction | 2017 |
| Raven Repairs Limited | Construction | 2014 |
| Ravers Entertainment Media Ltd | Information & communication | 2024 |
| Raygain Technologies Limited | Information & communication | 2023 |
| RBA Plumbing & Bathrooms Ltd | Construction | 2024 |
| RBR Building Ltd | Administrative & support | 2025 |
| RC Clean Cream Limited | Hospitality | 2023 |
| RC Design & Build Ltd | Construction | 2021 |
| RC Housing Redhill Ltd | Other services | 2025 |
| RC Infra Construction Ltd | Construction | 2020 |
| RC Serenity Care Services Limited | Health & social care | 2025 |
| Rcoc Electrical Limited | Construction | 2023 |
| RD Restorations Limited | Wholesale & retail | 2010 |
| React 4 Group (Holdings) Ltd | Construction | 2021 |
| Readit Consultancy Limited | Professional & scientific | 2024 |
| Reality V Ltd | Wholesale & retail | 2020 |
| Red Arch Investments Limited | Real estate | 2020 |
| Red Cottage Industries Ltd | Manufacturing | 2018 |
| Red Dragon Electrical Group Ltd | Construction | 2026 |
| Red Face Holdings Ltd | Real estate | 2023 |
| Red Jacket Ltd | Real estate | 2026 |
| Red Panda Tree Limited | Professional & scientific | 2023 |
| Redgate Law Ltd | Administrative & support | 2025 |
| Redhill Aerodrome Limited | Transport & logistics | 1932 |
| Redhill Aerodrome Trading Limited | Transport & logistics | 1994 |
| Redhill Aerodrome Ventures Limited | Transport & logistics | 1991 |
| Redhill Air Services Limited | Manufacturing | 1996 |
| Redhill Aircraft Maintenance and Aircraft Leasing Ltd | Manufacturing | 2011 |
| Redhill Barbers Ltd | Other services | 2017 |
| Redhill Business Guild | Other services | 2017 |
| Redhill Classics (Surrey) Ltd | Wholesale & retail | 2022 |
| Redhill Classics Limited | Wholesale & retail | 2017 |
| Redhill Curry Ltd | Hospitality | 2023 |
| Redhill EYE Care Limited | Health & social care | 2009 |
| Redhill Farm Services Ltd | Agriculture & fishing | 2020 |
| Redhill Flying Club Limited | Transport & logistics | 1934 |
| Redhill Indian Limited | Hospitality | 2023 |
| Redhill Lawn Tennis Club Limited | Arts & recreation | 1951 |
| Redhill Methodist Trading Limited | Other services | 1997 |
| Redhill Photo Centre Ltd | Professional & scientific | 2019 |
| Redhill POP Inn Cafe Limited | Hospitality | 2021 |
| Redhill Psychology Ltd | Health & social care | 2020 |
| Redhill Spices Ltd | Hospitality | 2026 |
| Redhill Therapy Limited | Health & social care | 2019 |
| Redhill Traders Limited | Hospitality | 2023 |
| Redhill Travels Ltd | Administrative & support | 2018 |
| Redhill Vehicle Body Repairs Limited | Wholesale & retail | 2012 |
| Redhill Warriors Sports Club Ltd | Arts & recreation | 2023 |
| Redjob Limited | Information & communication | 2023 |
| Redman Green LLP | | 2012 |
| Redmarylebone Consultancy & Marketing Ltd | Professional & scientific | 2016 |
| Redo Investment Ltd | Real estate | 2025 |
| Redscale Ltd | Professional & scientific | 2022 |
| Redstone Energy Limited | Professional & scientific | 2021 |
| Redstone Financial Planning Limited | Financial services | 2022 |