| Poplow Ltd | Wholesale & retail | 2024 |
| POT of Sauce LLP | | 2025 |
| PPH & Family Ltd | Information & communication | 2020 |
| Precision Land Surveyors (Wales) Ltd | Construction | 2024 |
| Premier Electrical (U.K.) Ltd | Construction | 2017 |
| Premier Products & Services Limited | Administrative & support | 2006 |
| Prepdd Ltd | Hospitality | 2025 |
| Prestige Homes Cwmbach Ltd | Construction | 2021 |
| Prestige Homes Llwydcoed School Ltd | Construction | 2022 |
| Prestige Homes Pentwyn Cynon Farm Ltd | Construction | 2024 |
| Prestige Homes Trecynon Ltd | Construction | 2023 |
| Prestige Tanning (Aberdare) Limited | Other services | 2015 |
| Price Price & Company Limited | Hospitality | 2023 |
| Primal Chiropractic Limited | Health & social care | 2020 |
| Primo AV Limited | Construction | 2019 |
| Primodt Ltd | Education | 2023 |
| Principality Windows Ltd | Manufacturing | 2016 |
| Printing Components Limited | Manufacturing | 2009 |
| Pritchard Commercial Services Ltd | Construction | 2024 |
| Profit Margins Limited | Extraterritorial | 2019 |
| Propec Group Ltd | Construction | 2025 |
| Property Auctions South Wales Ltd | Real estate | 2017 |
| Prosper Care & Support Limited | Health & social care | 2020 |
| Protar Ltd | Real estate | 2016 |
| Protech Plumbing Ltd | Construction | 2024 |
| PYWX2 Limited | Energy | 2024 |
| R & D Plasterers Ltd | Construction | 2016 |
| R & E Bar & Restaurant Limited | Hospitality | 2026 |
| R P & M Davies Limited | Wholesale & retail | 2005 |
| R&D Residential Properties Ltd | Real estate | 2024 |
| R&W Portfolio Builder Ltd | Real estate | 2025 |
| R. Chappell Groundworks Ltd | Construction | 2005 |
| RAC Carpentry Ltd | Manufacturing | 2025 |
| Rachael's Playhouse Limited | Health & social care | 2016 |
| Railway Contractors Ltd | Construction | 2018 |
| RAL Properties Limited | Real estate | 2015 |
| Ramsay & White Estate Agents Ltd | Real estate | 2018 |
| Rapid Deployment 365 Ltd | Administrative & support | 2019 |
| Rapidgrid Limited | Construction | 1990 |
| RB Advanced Inspection Ltd | Professional & scientific | 2026 |
| RCT Domestic Abuse Services Limited | Health & social care | 2013 |
| Rdejones Ltd | Construction | 2024 |
| Rdnts Ltd | Wholesale & retail | 2025 |
| Reardon Therapies Ltd | Health & social care | 2024 |
| Red Wolf Solutions Limited | Water & waste | 2016 |
| Redcroft Holdings Ltd | Financial services | 2024 |
| Redwood Homes South Wales Ltd | Construction | 2025 |
| Refined Property Ltd | Real estate | 2020 |
| Reidflo Construction Consultancy Ltd | Professional & scientific | 2025 |
| Reki Rail Ltd | Construction | 2019 |
| RER Investments Limited | Wholesale & retail | 2024 |
| Resilient Foster Care Ltd | Health & social care | 2016 |
| Resolven Market Traders Ltd | Other services | 2016 |
| Respawn Ltd | Administrative & support | 2025 |
| Response Engineering Solutions Limited | Manufacturing | 2007 |
| Response Skills Training Solutions Limited | Education | 2018 |
| Retro Rarity Limited | Wholesale & retail | 2024 |
| RGE Financial Services Ltd | Professional & scientific | 2018 |
| Rheidol Electrical Services Ltd | Manufacturing | 2017 |
| Rhigos Aero Club | Arts & recreation | 2025 |
| Rhigos Road Motors Ltd | Wholesale & retail | 2015 |
| Richards Funeral Services Limited | Other services | 2003 |
| Richecca Inns Limited | Hospitality | 2005 |
| Roberto's Lounge Ltd | Hospitality | 2025 |
| Romain Properties Ltd | Real estate | 2026 |
| Ronfields Developments Ltd | Real estate | 2020 |
| Rose & Leaf Limited | Professional & scientific | 2003 |
| Rosey Developments Limited | Construction | 1999 |
| Rosie’S Precision EAR Care Limited | Health & social care | 2025 |
| Ross Prangley Ltd | Extraterritorial | 2023 |
| Route 66 Hair Specialists Ltd | Other services | 2016 |
| RPD Haulage Ltd | Transport & logistics | 2015 |
| RSA Platinum Limited | Financial services | 2025 |
| RSK Production Services Limited | Construction | 2011 |
| Rubicon MX Ltd | Wholesale & retail | 2020 |
| RW Engineering Consultancy Ltd | Professional & scientific | 2015 |
| RWR Properties Ltd | Real estate | 2021 |
| Ryan Lovell Limited | Wholesale & retail | 2025 |
| Ryan Williams Brawn Foundations Ltd | Construction | 2025 |
| Rywwul Ltd | Hospitality | 2023 |
| S & U Partners Ltd | Hospitality | 2024 |
| S Cartwright Construction Ltd | Construction | 2020 |
| S J Manfield Civils Limited | Construction | 2018 |
| S J Stores Limited | Wholesale & retail | 2018 |
| S M D Management Ltd | Administrative & support | 2025 |
| S Morgan Installations Ltd | Construction | 2014 |
| S W Valley Motor Company Ltd | Wholesale & retail | 2023 |
| S&M Fibre Ltd | Construction | 2024 |
| S&M Infrastructure Services Ltd | Construction | 2023 |
| S10 Properties Limited | Real estate | 2019 |
| Sable and Stone Real Estate Ltd | Real estate | 2025 |
| Safe Home Consultancy Ltd | Professional & scientific | 2025 |
| Safe Storage Ltd | Other services | 2021 |
| Sanctus Living Limited | Construction | 2024 |
| Sarah Alex Carter Wellbeing Services Ltd | Other services | 2021 |
| Satori BBB Limited | Arts & recreation | 2015 |
| Savvy SIP Ltd | Hospitality | 2021 |
| Sbbt Food Ltd | Hospitality | 2026 |
| Scott Seaton Enterprises Limited | Construction | 2011 |
| SD Roofing Solutions Ltd | Construction | 2024 |