| R & M Insulation Company Limited | Construction | 2003 |
| R & O Walters Limited | Wholesale & retail | 2023 |
| R & S Auto Centre Newport Ltd | Wholesale & retail | 2025 |
| R & S Auto Logistics Ltd | Transport & logistics | 2023 |
| R & S Stores Limited | Wholesale & retail | 2012 |
| R & S Ward Limited | Wholesale & retail | 2002 |
| R & T Property Holdings Limited | Real estate | 2025 |
| R a Daish and Sons Limited | Construction | 2001 |
| R a Lands Limited | Financial services | 2020 |
| R a News (Newport) Ltd | Wholesale & retail | 2019 |
| R a Smash Burger & Pizza Ltd | Hospitality | 2024 |
| R C J Electrical Limited | Administrative & support | 2016 |
| R C Marshall Haulage Limited | Transport & logistics | 2022 |
| R E Phillips & Partners Limited | Real estate | 2019 |
| R Grace Ltd | Administrative & support | 2021 |
| R H Taylor (Perreton) Limited | Agriculture & fishing | 1944 |
| R J Dooley Limited | Financial services | 2019 |
| R J Financial Accounting Services Limited | Professional & scientific | 2007 |
| R J Financial Umbrella Ltd | Professional & scientific | 2021 |
| R J H Building Services Limited | Construction | 2012 |
| R J Smith Engineering Limited | Manufacturing | 2014 |
| R L P DRY Lining Limited | Construction | 2012 |
| R L Smith Ltd | Other services | 2023 |
| R N Tamplin Limited | Construction | 2007 |
| R P Kear Limited | Construction | 2018 |
| R P L Construction Limited | Administrative & support | 2005 |
| R S Property Management Caldicot Limited | Households | 2018 |
| R Taylor Carpentry Limited | Construction | 2021 |
| R Verma Retail Ltd | Wholesale & retail | 2021 |
| R Watkins Services Limited | Professional & scientific | 2012 |
| R&Jc Property Limited | Real estate | 2020 |
| R&N Inflatable Hire Limited | Administrative & support | 2018 |
| R&R Bespoke Joinery Limited | Construction | 2019 |
| R-K Shopping Limited | Wholesale & retail | 2023 |
| R. Kumar Limited | Health & social care | 2010 |
| R.A. 2019 Limited | Financial services | 2019 |
| R.A.S.C.A.L. (Regeneration Association Somerton Community at Large) | Arts & recreation | 2007 |
| R.B.A.T.E.C. Limited | Professional & scientific | 2023 |
| R.C.D Homes Ltd | Real estate | 2023 |
| R.H. Sheppard Limited | Extraterritorial | 1960 |
| R.J. Bateman (Engineering) Limited | Manufacturing | 1980 |
| R.J. Mason (Holdings) Limited | Real estate | 2005 |
| R.M.Roofing.Iow Ltd | Construction | 2026 |
| R.Mustafa Limited | Wholesale & retail | 2019 |
| R.P.L Construction (IOW) Limited | Construction | 2020 |
| R.S.O. Publishing Limited | Arts & recreation | 1968 |
| R.W. Cole Limited | Health & social care | 1993 |
| R69 Holdings Limited | Professional & scientific | 2022 |
| RA Escouita Ltd | Health & social care | 2017 |
| RA Holdings Limited | Professional & scientific | 2008 |
| RA Professionals Ltd | Health & social care | 2025 |
| Rabaiotti's Cards Limited | Wholesale & retail | 2010 |
| Rabbits Developments Ltd | Real estate | 2022 |
| Rabmeek Ltd | Households | 2026 |
| Race Yacht Services Limited | Manufacturing | 2013 |
| Rackham Planning Limited | Professional & scientific | 2014 |
| Raclair Hairdressers Limited | Other services | 1996 |
| Radiant Goods Limited | Wholesale & retail | 2015 |
| Radio Nova Limited | Information & communication | 2011 |
| Radran Ltd | Health & social care | 2025 |
| RAE Olner Limited | Construction | 2017 |
| Rae.W (Llanmartin) Ltd | Real estate | 2014 |
| Rae.W Limited | Construction | 2012 |
| Rafb Cleaning Ltd | Administrative & support | 2018 |
| Raglan Mews Management Company Limited | Households | 1998 |
| Rags 2 Riches 4 Schools Ltd | Wholesale & retail | 2025 |
| Raholdingsuk Limited | Financial services | 2021 |
| Rahp Properties Ltd | Real estate | 2022 |
| Rail Services Ltd | Transport & logistics | 2019 |
| Rail Support Limited | Manufacturing | 2015 |
| Rainbow Brite Cleaning Services Limited | Administrative & support | 2006 |
| Rainbow Building Fabrics Limited | Construction | 2018 |
| Rainbow Childrens Club Limited | Other services | 2012 |
| Rainbow Taverns Ltd | Hospitality | 2019 |
| Rainbows OUT of School Club Limited | Other services | 2015 |
| Raisbeck Legal Services Ltd | Professional & scientific | 2020 |
| Raise Global Group Ltd | Professional & scientific | 2017 |
| Rajgate (Bargoed) Ltd | Hospitality | 2017 |
| Rajpoot Tandoori (Crumlin) Ltd | Hospitality | 2026 |
| RAK Printed Circuit Boards Limited | Manufacturing | 2004 |
| RALLS8 Ltd | Real estate | 2018 |
| RAM Tipping Ltd | Transport & logistics | 2014 |
| Rama Properties and Investments Ltd | Construction | 2024 |
| Raman Jagpal Limited | Real estate | 2009 |
| Ramcarthy Ltd | Hospitality | 2022 |
| Ramm Media Ltd | Arts & recreation | 2024 |
| Rammed Roots Limited | Agriculture & fishing | 2025 |
| Ramphub Newport Limited | Wholesale & retail | 2025 |
| Rams Barbershop Ltd | Other services | 2024 |
| Ramsey Vaughan Properties Limited | Real estate | 2023 |
| Rana & Co Property Ltd | Real estate | 2025 |
| Random Moment Limited | Other services | 2002 |
| Random Worlds Limited | Arts & recreation | 2025 |
| Ranikhet CYF. | Hospitality | 2025 |
| Rapanea Consulting Ltd. | Information & communication | 2004 |
| Rapha Room Ltd | Public administration | 2025 |
| Raphoe Light UK Ltd | Construction | 2023 |
| Rapidroll Limited | Construction | 2014 |
| Rare Property Investments Ltd | Real estate | 2023 |
| Rasima’S Costs Recoveries Ltd | Professional & scientific | 2024 |