| Roseland Heavy Cargo Logistics Limited | Transport & logistics | 2017 |
| Roseland Hospitality Ltd | Hospitality | 2021 |
| Roseland Inn Ltd | Hospitality | 2023 |
| Roseland Motors Ltd | Wholesale & retail | 2020 |
| Roseland Paddle and Sail Limited | Education | 2017 |
| Roseland Planning Limited | Professional & scientific | 2024 |
| Roseland Restoration Limited | Construction | 1989 |
| Roseland Resurfacing Limited | Construction | 2015 |
| Roseland Rugby Football Club Ltd | Arts & recreation | 2009 |
| Roseland Solutions Ltd | Agriculture & fishing | 2020 |
| Roseland Synergy Limited | Other services | 2009 |
| Roselyn Coaches (Holdings) Limited | Professional & scientific | 2011 |
| Rosemundy Investments Limited | Real estate | 1994 |
| Roseville Holiday Park Limited | Hospitality | 2002 |
| Roseworthy Properties | Real estate | 1987 |
| Roskrow Holdings Limited | Transport & logistics | 2017 |
| Roskrow Real Estate Ltd | Real estate | 2019 |
| Ross Martin Limited | Extraterritorial | 2015 |
| Roszell Chiro Ltd | Health & social care | 2024 |
| Rotasail Limited | Professional & scientific | 1988 |
| Rothbridge Construction Group Limited | Construction | 2023 |
| Rothbridge Investments Limited | Professional & scientific | 2020 |
| Rothbridge IT Group Limited | Professional & scientific | 2023 |
| Rothbridge Marketing Group Holdings Limited | Financial services | 2026 |
| Rothbridge Transport SPV 1 Ltd | Financial services | 2025 |
| ROU Design Ltd | Professional & scientific | 2019 |
| Round the Clock Security Limited | Administrative & support | 2006 |
| Roundhouse Management Services Limited | Households | 2016 |
| Routenote Limited | Administrative & support | 2010 |
| Rowan Care Cornwall Limited | Extraterritorial | 2019 |
| Rowbeach Limited | Real estate | 1988 |
| Rowell Yachting Services Limited | Arts & recreation | 2004 |
| Royal Oak Cornwall Limited | Hospitality | 2025 |
| Royal Oak Perranwell Station Holdings Limited | Financial services | 2025 |
| Royston Leigh Limited | Real estate | 1970 |
| RP Renewables Limited | Professional & scientific | 2021 |
| RPD Tyres Ltd | Wholesale & retail | 2025 |
| Rpgg Media Ltd | Information & communication | 2017 |
| Rplh Ltd | Financial services | 2023 |
| RPS Maintenance Ltd | Agriculture & fishing | 2016 |
| RRL Holdings Limited | Financial services | 2025 |
| RRL LLP | | 2017 |
| RRL Probate Limited | Professional & scientific | 2025 |
| RRL Wills Limited | Professional & scientific | 2016 |
| RRN Advisory Ltd | Administrative & support | 2025 |
| RSJ2 Energy Limited | Energy | 2013 |
| RSJ3 Energy Ltd | Energy | 2012 |
| Rsla Ltd | Professional & scientific | 2022 |
| RSM Elevate Football Coaching Limited | Education | 2025 |
| Rtts Events Ltd | Administrative & support | 2021 |
| Ruck ‘N Roll Ltd | Hospitality | 2025 |
| Ruin Studio Limited | Professional & scientific | 2016 |
| Rule of None Limited | Information & communication | 2025 |
| Rundles Court Management Limited | Households | 1987 |
| Ruola Ltd | Wholesale & retail | 2023 |
| Rupert Hambly Health and Performance Ltd | Professional & scientific | 2018 |
| Rupert Taurus Ltd | Financial services | 2014 |
| Rural Economic Partnership Limited | Professional & scientific | 1996 |
| Rural Reconnection CIC | Education | 2019 |
| Rush Construction Management Ltd | Construction | 2021 |
| Rushy Point Limited | Agriculture & fishing | 2024 |
| Ruskin Court Limited | Households | 2017 |
| Russell Mews Management Company Limited | Households | 1989 |
| Rusty Brewing Ltd | Professional & scientific | 2015 |
| Rusty Property Limited | Real estate | 2025 |
| RV Groups Ltd | Wholesale & retail | 2018 |
| Ryan House Ltd | Manufacturing | 2019 |
| S & B Cornwall Inns Limited | Wholesale & retail | 2007 |
| S & T Carpentry Ltd | Construction | 2022 |
| S and a Developments Southwest Ltd | Construction | 2023 |
| S C Nutrition Limited | Professional & scientific | 2012 |
| S J K Surf Limited | Hospitality | 2012 |
| S M Hubbard Construction Limited | Construction | 2013 |
| S Turner Plumbing & Heating Limited | Construction | 2022 |
| S Wisdom Trading Ltd | Other services | 2014 |
| S Y Colours Ltd | Manufacturing | 2025 |
| S&S (Cornwall) Limited | Construction | 2023 |
| S&S Carpentry Contractors Ltd | Construction | 2019 |
| S&S Holsworthy Ltd | Construction | 2025 |
| S&S Penpol Ltd | Real estate | 2021 |
| S&S South Crofty Ltd | Construction | 2025 |
| S&S ST Agnes Ltd | Real estate | 2021 |
| S&S Tresillian Ltd | Real estate | 2021 |
| Sab’S Tech Repairs Ltd | Other services | 2023 |
| Sacred Earth Activism CIC | Professional & scientific | 2024 |
| Safe Harbour Small Business Advisors Limited | Administrative & support | 2026 |
| Sage House Management Company Limited | Households | 2021 |
| Sail ROW Explore Ltd | Transport & logistics | 2021 |
| Saint Pauls Healthcare Ltd | Administrative & support | 2022 |
| Saint Piran Cycling CIC | Education | 2021 |
| Saint Piran Electrical Ltd | Construction | 2025 |
| Saint Piran Limited | Wholesale & retail | 2015 |
| Saint Piran Property Ltd | Real estate | 2024 |
| Saitech UK Limited | Information & communication | 2009 |
| Sakushin Limited | Health & social care | 2008 |
| SALESFORCE4GOOD Limited | Information & communication | 2012 |
| Sally French Commercial Limited | Real estate | 2023 |
| Salmon & Collett Building Services Limited | Construction | 2016 |
| Salt Projects Cornwall Ltd | Financial services | 2019 |
| Salt Water Beads Ltd | Wholesale & retail | 2012 |