| Quality Chips Ltd | Hospitality | 2024 |
| Quite Scary Productions & Events Limited | Professional & scientific | 2011 |
| R and H Operators Ltd | Construction | 2013 |
| R J F Services Limited | Construction | 2017 |
| R Lewis Rail Services Limited | Construction | 2014 |
| R S F Rail Limited | Construction | 2016 |
| R&D Sprinklers Limited | Construction | 2026 |
| R&N Mears Property Ltd | Real estate | 2021 |
| Radulea Transport Limited | Transport & logistics | 2018 |
| RAF Rail Ltd | Construction | 2015 |
| Ramsay & White Ltd | Financial services | 2017 |
| Ramsay & White Properties Ltd | Real estate | 2025 |
| Ramsay & White Protection Ltd | Financial services | 2025 |
| Ramsay & White Wealth Management Limited | Financial services | 2022 |
| Ravesocks Ltd | Wholesale & retail | 2026 |
| Rawa Vape Ltd | Wholesale & retail | 2024 |
| Realskillz - the Blacksheep Project CIC | Construction | 2023 |
| Red Kite Bridging Ltd | Financial services | 2022 |
| Red Kite FF1 Ltd | Financial services | 2023 |
| Red Kite Lending Ltd | Financial services | 2022 |
| Red Kite Reserves Ltd | Financial services | 2022 |
| Redefined Futures Ltd. | Education | 2016 |
| Region Coffee Ltd | Manufacturing | 2025 |
| Reia Legacy Ltd | Wholesale & retail | 2025 |
| Relecserv Ltd | Construction | 2022 |
| Remapping the Way Ltd | Wholesale & retail | 2017 |
| Render Systems Online Limited | Wholesale & retail | 2024 |
| Reset RCT CIC | Other services | 2026 |
| Rhondda Ales & Minerals Ltd | Hospitality | 2017 |
| RJC Global Engineering Ltd | Manufacturing | 2023 |
| Roberts Strategic Holdings Limited | Financial services | 2025 |
| Rocialle Healthcare Limited | Health & social care | 2019 |
| Rowan Tree Cancer Care | Health & social care | 2002 |
| Roycevoyage Limited | Transport & logistics | 2024 |
| Rudd & SON Transport Ltd | Transport & logistics | 2024 |
| Ryan Transport & Haulage Ltd | Transport & logistics | 2023 |
| S L H Enterprises Limited | Transport & logistics | 1992 |
| S Rakei Drylining Ltd | Construction | 2018 |
| SA Executive Consulting Ltd | Professional & scientific | 2023 |
| Safe GAS Wales Ltd | Construction | 2009 |
| Sals Clothing Ltd | Wholesale & retail | 2026 |
| Sarah's Snacks (Cymru) Ltd | Hospitality | 2000 |
| SB Legal Ltd | Other services | 2021 |
| SB Mobile Valeting Limited | Administrative & support | 2025 |
| SB Shopfitting Ltd | Construction | 2025 |
| SBL Business Services Limited | Professional & scientific | 2018 |
| SCA Property Investment Ltd | Real estate | 2024 |
| Scbd Investment Ltd | Real estate | 2022 |
| Sci-Tx Ltd | Information & communication | 2023 |
| Serenity Support Services Limited | Other services | 2016 |
| SG Roofing and Cladding Ltd | Construction | 2019 |
| Sheehan Richards Properties Limited | Real estate | 2025 |
| Sinupress Ltd | Manufacturing | 2010 |
| Sirius Skills Consulting Ltd | Professional & scientific | 2010 |
| SIS Accounts Ltd | Professional & scientific | 2024 |
| SLS Cctv Ltd | Construction | 2025 |
| Smart Electrical Rail Ltd | Construction | 2015 |
| Smart Electrical Systems Ltd | Manufacturing | 2012 |
| Smart Rail Systems Ltd | Construction | 2015 |
| Smartpark 360 Ltd | Information & communication | 2025 |
| Smartwip Smart Repairs Ltd | Wholesale & retail | 2023 |
| Smoked UP Ltd | Manufacturing | 2023 |
| SMS Drylining Ltd | Construction | 2025 |
| SO Socially HER Limited | Professional & scientific | 2024 |
| Solasa Ltd | Administrative & support | 2025 |
| Spilsbury Law Limited | Professional & scientific | 2022 |
| SPM Plastics Limited | Manufacturing | 2000 |
| Spsc Builders Limited | Construction | 2014 |
| Star Holiday Homes Ltd | Real estate | 2026 |
| Stom Investment Ltd | Real estate | 2021 |
| STR Drylining Ltd | Construction | 2026 |
| Stradstone Ltd | Construction | 2018 |
| Straight to the Point Ltd | Wholesale & retail | 2025 |
| STS Estate Agents Limited | Real estate | 2016 |
| Swaarm Ltd | Information & communication | 2021 |
| System Solutions (Gloucester) Limited | Information & communication | 2011 |
| T Samuel Estate Agents Limited | Real estate | 2019 |
| T Samuel Exclusive Limited | Real estate | 2025 |
| T Samuel Hirwaun Limited | Real estate | 2025 |
| T Samuel Lettings Solutions Limited | Real estate | 2025 |
| T Samuel Sales Limited | Real estate | 2025 |
| T&E Services Limited | Professional & scientific | 2023 |
| T1 Safety & Survey Ltd | Manufacturing | 2017 |
| T101 Group Ltd | Manufacturing | 2018 |
| Tcare Ltd | Health & social care | 2024 |
| Tcsrc Limited | Administrative & support | 2024 |
| Techxi Coaches Limited | Transport & logistics | 2025 |
| Techxi Holdings Limited | Financial services | 2022 |
| Techxi Limited | Transport & logistics | 2018 |
| Techxi School Transport Limited | Transport & logistics | 2025 |
| Temir's Kebab House Ltd | Hospitality | 2024 |
| Temp Air Services Ltd | Construction | 2024 |
| THE Butchers Arms Mountain ASH Ltd | Hospitality | 2026 |
| THE Coffi House Dog Groomers Ltd | Other services | 2023 |
| THE Edible Forest B Limited | Agriculture & fishing | 2023 |
| THE Funding Operation Limited | Financial services | 2008 |
| THE Jellyfish Cafe Ltd | Hospitality | 2018 |
| THE Karanje Family Properties Ltd | Real estate | 2026 |
| THE Morgan School of Language Limited | Education | 2011 |
| THE Platt Barbershop Ltd | Other services | 2023 |