| RM6 Limited | Real estate | 2015 |
| RMA Sports Injury Clinic Ltd | Health & social care | 2019 |
| RME Electrical Services Ltd | Construction | 2020 |
| RME Fit OUT Ltd | Construction | 2024 |
| RME Group Services Ltd | Financial services | 2024 |
| RME Mechanical Ltd | Construction | 2024 |
| RME PFP Ltd | Construction | 2024 |
| RMF Eco Ltd | Administrative & support | 2024 |
| RMH Engineering Services Limited | Construction | 2019 |
| RMK8 Ltd | Real estate | 2022 |
| RMM Management Ltd | Professional & scientific | 2023 |
| RN Contractors Limited | Construction | 2025 |
| RNA Interiors Ltd | Construction | 2026 |
| RNB (NPT) Limited | Wholesale & retail | 2024 |
| Rnfa Group Ltd | Financial services | 2023 |
| RNM Contractors Limited | Construction | 2024 |
| RO6.5HAW Limited | Arts & recreation | 2018 |
| Roach Assets Limited | Wholesale & retail | 2026 |
| Roach Pittis (H2) Limited | Financial services | 2022 |
| Roach Pittis Holdings Limited | Financial services | 2021 |
| Roach Pittis Legal Services Limited | Professional & scientific | 2019 |
| Roach Pittis LLP | | 2014 |
| Roach Pittis Solicitors Limited | Administrative & support | 2003 |
| Road Craft Driving Academy Limited | Education | 2025 |
| Road Master Garage Ltd | Wholesale & retail | 2026 |
| Roadrunner 24/7 Logistics Ltd | Transport & logistics | 2026 |
| Roaming Around Ltd | Hospitality | 2025 |
| Roastertec Ltd | Manufacturing | 2021 |
| Roath Fish Ltd | Hospitality | 2025 |
| ROB Santwris Flooring Limited | Wholesale & retail | 2022 |
| ROB Simmons Consultancy Ltd | Arts & recreation | 2020 |
| Rob&Co Limited | Wholesale & retail | 2019 |
| Rob's Fasteners Ltd | Wholesale & retail | 2025 |
| Robb Forbes Ltd | Financial services | 2024 |
| Robcology Services CYF. | Water & waste | 2026 |
| Robert Black Tran's Ltd | Other services | 2017 |
| Robert LEE Hairdressing Ltd | Other services | 2014 |
| Robert Nicholas Financial Advisers Ltd | Financial services | 2005 |
| Robert Stigwood Group Limited(The) | Arts & recreation | 1967 |
| Robert Stigwood Organisation Limited(The) | Arts & recreation | 1965 |
| Robert Young Cars Ltd | Wholesale & retail | 2025 |
| Roberts & Co Accountants (Newport) Limited | Professional & scientific | 2003 |
| Roberts & Co Surveyors & Valuers Limited | Professional & scientific | 2009 |
| Roberts and Knight Ltd. | Professional & scientific | 2006 |
| Roberts Quality Engineering Limited | Professional & scientific | 2021 |
| Roberts-Jones Limited | Education | 2015 |
| Robertson IP Limited | Professional & scientific | 2019 |
| Robgis Ltd | Health & social care | 2022 |
| Robin Hill Partnership Limited | Administrative & support | 2024 |
| Rochester Midland Corporation Limited | Manufacturing | 1996 |
| Rock Construction (SW) Ltd | Construction | 2017 |
| Rock N Soul Crystals Limited | Wholesale & retail | 2025 |
| Rock Plant Ltd | Administrative & support | 2024 |
| Rock the WOK Limited | Hospitality | 2024 |
| Rocket Ronnies (Newport) Limited | Arts & recreation | 2023 |
| ROCKET74 Limited | Arts & recreation | 2023 |
| Rockhopper Events Ltd | Professional & scientific | 2018 |
| Rockpool Films Ltd | Information & communication | 2026 |
| Rocks Foods Ltd | Wholesale & retail | 2024 |
| Rockworx Property Ltd | Real estate | 2025 |
| Rockys (Newport) Ltd | Hospitality | 2019 |
| Roemarsh Limited | Health & social care | 1990 |
| Roger Price Photographic Limited | Professional & scientific | 1965 |
| Roger Taylor Auto Services Ltd | Wholesale & retail | 2021 |
| Roger Tilley Building & Maintenance Limited | Construction | 2013 |
| Rogerstone HCW Ltd | Administrative & support | 2018 |
| Rogerstone IFA Limited | Financial services | 2023 |
| Rogerstone Nutrition Limited | Other services | 2021 |
| Rogerstone Property Group Ltd | Transport & logistics | 2024 |
| Rogerstone Woodworkers Limited | Construction | 1961 |
| Rogue FOX Ltd | Manufacturing | 2019 |
| Rohini Premier Enterprises LLP | | 2007 |
| Rolla Court Management (Newport) Limited | Households | 1991 |
| Rollhaven Management (Clare Court) Limited | Households | 1988 |
| Rolly F Collections Limited | Manufacturing | 2025 |
| Romaine Investments Ltd | Financial services | 2018 |
| Roman and Lyra Limited | Financial services | 2025 |
| Roman Auto Centre Ltd | Wholesale & retail | 2025 |
| Roman Building Services Ltd | Construction | 2026 |
| Roman Taxis Ltd | Transport & logistics | 2019 |
| Roman Way Convenience Limited | Wholesale & retail | 2022 |
| Romanian Corner Ltd | Wholesale & retail | 2023 |
| Romax Carpentry & Joinery Limited | Construction | 2013 |
| Rombourne Limited | Real estate | 1973 |
| Romero Jumbo Global Enterprise Ltd | Construction | 2025 |
| Ronan Malt Language Services Limited | Professional & scientific | 2022 |
| Ronger Properties Limited | Professional & scientific | 1936 |
| ROO Essentials Ltd | Wholesale & retail | 2026 |
| Roof-Tek (IOW) Ltd | Construction | 2018 |
| Roofers ARE US Limited | Construction | 2026 |
| Roofline Contractors Limited | Construction | 2016 |
| Roofstore (P&P) Limited | Wholesale & retail | 2012 |
| Rookyfx Ltd | Information & communication | 2024 |
| Rooney Real Estate & Developments Limited | Real estate | 2022 |
| ROONEY10 Ltd | Professional & scientific | 2014 |
| Rooster Ryder Analytics Ltd | Information & communication | 2026 |
| Root & Rise by Saphire Ltd | Professional & scientific | 2025 |
| Rooted Supplements Limited | Wholesale & retail | 2025 |
| Roots Newport CIC | Other services | 2026 |
| ROOTS1 Ltd | Construction | 2025 |