| RAP Poptops Limited | Administrative & support | 2017 |
| Raptor Strong L.P. | | 2018 |
| RAR Consultants Ltd | Financial services | 2025 |
| RAS Pipefitting and Fabrication Ltd | Manufacturing | 2016 |
| Rastall Health Services Limited | Health & social care | 2023 |
| RBD Investments Ltd | Professional & scientific | 2016 |
| RCG Energy Ltd | Professional & scientific | 2013 |
| RCJ Aesthetics Limited | Health & social care | 2021 |
| RCJ Beauty Ltd | Other services | 2022 |
| RD Transport Ltd | Transport & logistics | 2021 |
| RDH (Carmarthen) Ltd | Financial services | 2018 |
| RDH Agri Ltd | Agriculture & fishing | 2026 |
| Ready Plant & Tool Hire Limited | Administrative & support | 2011 |
| Rebecca Louise Cosmetic Studios and Academy Ltd | Other services | 2024 |
| Reclaim CA Ltd | Professional & scientific | 2019 |
| Recover Medical Limited | Information & communication | 2026 |
| Red Dragon Rentals Ltd | Real estate | 2022 |
| Red Dragon Survey Ltd | Professional & scientific | 2010 |
| Red Dragon Technology Ltd | Information & communication | 2020 |
| Red Inclusive Interiors Ltd | Wholesale & retail | 2025 |
| Red Kite Dental Care Limited | Health & social care | 2015 |
| Redberth Gardens Management Co. Ltd | Administrative & support | 2013 |
| Redfield Renovations Ltd | Construction | 2025 |
| Redland Project Services Ltd | Construction | 2014 |
| Redline Recovery Ltd | Transport & logistics | 2026 |
| Reefresh Limited | Wholesale & retail | 2025 |
| Rees Electrical Engineering Services Limited | Manufacturing | 2018 |
| Rees Sound Systems Ltd | Administrative & support | 2009 |
| Reeves Renovations (Bath) Limited | Construction | 2011 |
| Registration Services Limited | Administrative & support | 2022 |
| Renewco (UK) Ltd | Energy | 2009 |
| Rental Right Ltd | Real estate | 2022 |
| Resarios Consulting Ltd | Professional & scientific | 2024 |
| Resin Bound by SD Limited | Construction | 2022 |
| Resonance Partners LLP | | 2009 |
| Respiratory Care West Wales Ltd | Health & social care | 2024 |
| Rexmile Trans PC | | 2018 |
| Reynolds Welsh Property Limited | Real estate | 2024 |
| RG Inspection Services Limited | Professional & scientific | 2007 |
| Rg.Balitayo Healthcare Ltd | Health & social care | 2021 |
| Rgib Ltd | Administrative & support | 2023 |
| RGJ & Sons Welding Ltd | Manufacturing | 2025 |
| Rhandir CYF | Real estate | 2021 |
| RHB Designs Limited | Professional & scientific | 2024 |
| Rhent Cymru Limited | Real estate | 2021 |
| Rhiane Rose 7 Care Ltd | Health & social care | 2023 |
| Rhiwonnen Livestock Centre Ltd | Agriculture & fishing | 2017 |
| Rhodri Thomas Engineering Ltd | Manufacturing | 2024 |
| Rhost Ltd | Hospitality | 2021 |
| Rhydsais CYF | Agriculture & fishing | 2016 |
| Rhydymarchog Golf Ltd. | Professional & scientific | 2015 |
| Rhys G Davies Properties Ltd | Real estate | 2023 |
| Richard Baggott Limited | Wholesale & retail | 2004 |
| Richard Lewis (Agricultural Contractor) Limited | Administrative & support | 2013 |
| Richard Robinson Limited | Construction | 2026 |
| Richards & Deakin Developments Ltd | Construction | 2025 |
| Richards Distributions Ltd | Wholesale & retail | 2019 |
| Ride Higher Ltd | Administrative & support | 2025 |
| Ride MFG Limited | Arts & recreation | 2023 |
| Ridgeway Care Home Limited | Health & social care | 2023 |
| Rimm Limited | Information & communication | 2009 |
| RJ Vans Ltd | Wholesale & retail | 2025 |
| RJC Property Ltd | Real estate | 2024 |
| RJJ Marine Ltd | Transport & logistics | 2024 |
| RK Cymru Properties Ltd | Households | 2025 |
| RKB Homes Ltd | Real estate | 2025 |
| Rkes (Wales) Limited | Construction | 2012 |
| RM Beachhouse Limited | Other services | 2021 |
| RMJ Property Investments Limited | Real estate | 2016 |
| Rmmr Collective Ltd | Professional & scientific | 2025 |
| RMO Capital Ltd | Professional & scientific | 2026 |
| RMY Orthopaedics Limited | Health & social care | 2015 |
| ROB Jones Landscaping Limited | Administrative & support | 2026 |
| ROB Jones Site Services Limited | Administrative & support | 2016 |
| ROB Thomas Ltd | Administrative & support | 2014 |
| ROB Thomas Reclamation Ltd | Water & waste | 2008 |
| Roberts Boyt Limited | Financial services | 2009 |
| Roberts Concessions Ltd | Hospitality | 2026 |
| Robinson Recycling Limited | Manufacturing | 2003 |
| Rock OUT Campers Limited | Wholesale & retail | 2022 |
| Rodbard Estates Ltd | Real estate | 2022 |
| Rod`S Ice Cream Limited | Wholesale & retail | 2004 |
| Rogers Recovery Limited | Wholesale & retail | 2024 |
| Rogers-Walters UK Ltd | Professional & scientific | 2026 |
| Ron&Mags Holdings Ltd | Financial services | 2024 |
| Rone's Jewellers Ltd | Manufacturing | 2023 |
| Ronsgifts Limited | Wholesale & retail | 2025 |
| Rook Stores Ltd | Wholesale & retail | 2021 |
| Rosan (Carms) Ltd | Agriculture & fishing | 2024 |
| Rose and Alexander Limited | Wholesale & retail | 2023 |
| Roselea Investments Limited | Construction | 2024 |
| Rosslyn Park Ltd | Construction | 2016 |
| Rossplus Limited | Administrative & support | 1981 |
| Round Wood- the Bespoke LOG Company Ltd | Manufacturing | 2019 |
| Rowtons' Museum Limited | Wholesale & retail | 2024 |
| ROY Tasker Rentals Ltd | Real estate | 2022 |
| RP24 Enterprise Ltd | Hospitality | 2026 |
| RPW Fire Sprinklers Limited | Construction | 2017 |
| RPW Radon Wales Limited | Construction | 2010 |
| Rrsa Properties Ltd | Real estate | 2026 |