| D & G Decorating & Property Maintenance Ltd | Construction | 2004 |
| D&G Decorating Holdings Ltd | Financial services | 2019 |
| D.G & Sons Building & Engineering Contractors Ltd | Construction | 2020 |
| D.S.Electrical Contracting Ltd | Construction | 2024 |
| Dave's Coaches Barry Island Limited | Transport & logistics | 2024 |
| David Edwards Investments Ltd | Construction | 2016 |
| David Hancock Safety Ltd | Construction | 2016 |
| David Lewis (Estates) Limited | Real estate | 1961 |
| Davies Renovations Ltd | Construction | 2026 |
| Davies Roofing Rhondda Limited | Construction | 2025 |
| DC Investors Ltd | Real estate | 2025 |
| DC Media & Photography Ltd | Professional & scientific | 2019 |
| DCH Drylining Ltd | Construction | 2018 |
| Digilibra Consultancy Limited | Information & communication | 2024 |
| DJ Property’S Development Ltd | Real estate | 2025 |
| Dog & Muff RCT Ltd | Other services | 2025 |
| Domino Foods Ltd | Hospitality | 2022 |
| Dorian Draconian Ltd | Arts & recreation | 2011 |
| Dragon Slate Company Ltd | Manufacturing | 2022 |
| Dragon Vale Limited | Construction | 2016 |
| Dragons DEN Parties Ltd | Arts & recreation | 2020 |
| Dragons DEN Rides Ltd | Administrative & support | 2026 |
| Dragons DEN Soft Play RCT Limited | Arts & recreation | 2014 |
| Driveway Tyres Ltd | Other services | 2017 |
| Drone Surveys Cardiff Ltd | Construction | 2024 |
| DWE Ltd | Construction | 2025 |
| Dylan Jack Griffiths Limited | Professional & scientific | 2025 |
| Dynamo Construction Development and Design Ltd | Construction | 2003 |
| E-Cycle Limited | Water & waste | 2012 |
| E.S.W Scaffolding Limited | Construction | 2025 |
| Easy Loan Limited | Financial services | 2003 |
| Easy PC Solutions Limited | Information & communication | 1997 |
| Ebpm Academy Ltd | Education | 2025 |
| Eco Building + Waste Services Ltd | Water & waste | 2024 |
| Eleanor Dunraven Management Ltd | Real estate | 2025 |
| Elite Tack and Harness Limited | Wholesale & retail | 2023 |
| Emily Kate Bridal Limited | Wholesale & retail | 2019 |
| Energy Building Maintenance Ltd | Construction | 2017 |
| ERM Investments Limited | Real estate | 2020 |
| Essentia Legal Consulting Limited | Professional & scientific | 2018 |
| Europa Digital Ltd | Information & communication | 2025 |
| Evans GAS Ltd | Construction | 2024 |
| Evans Plastering Services Limited | Construction | 2020 |
| Excel Cleaning Ltd | Administrative & support | 2019 |
| Excellent Fortune (Tonypandy) Limited | Hospitality | 2019 |
| FB Carpentry South Wales Limited | Construction | 2024 |
| Ferva Estates Ltd | Real estate | 2022 |
| Find Your Fierce Ltd | Wholesale & retail | 2026 |
| Flavour Street Kitchen Ltd | Hospitality | 2021 |
| Flowtech Manufacturing Holdings Ltd | Manufacturing | 2010 |
| Flush Away Plumbing Ltd | Construction | 2025 |
| Freedom Executive Homes Limited | Hospitality | 2003 |
| FUN Fillings Ltd | Hospitality | 2025 |
| Funtastic Kids Play Ltd | Arts & recreation | 2015 |
| Funtastic Parties Ltd | Administrative & support | 2024 |
| G & a Jones Property Ltd | Real estate | 2025 |
| G2KITCHEN Ltd | Hospitality | 2025 |
| G7 Brazilian JIU Jitsu Ltd | Arts & recreation | 2019 |
| G7 Team Apparel Ltd | Wholesale & retail | 2020 |
| Generation Financial Planning Limited | Professional & scientific | 2019 |
| Geosine Synergy Resources UK. Ltd | Mining & quarrying | 2022 |
| Getapngo Ltd | Information & communication | 2022 |
| GH Roofing Services Ltd | Construction | 2025 |
| GIJ Property Ltd | Construction | 2023 |
| Glamorline (Tonypandy) Ltd | Manufacturing | 2025 |
| Glamorline Blinds & Shutters Ltd | Manufacturing | 2015 |
| Global Spares Limited | Wholesale & retail | 2024 |
| Go Bananas Penygraig Ltd | Arts & recreation | 2024 |
| Gobigselfstorage Ltd | Real estate | 2025 |
| Golden House ( Penygraig ) Ltd | Hospitality | 2023 |
| Goline UK Limited | Wholesale & retail | 2026 |
| Gowerton Land Developments Limited | Construction | 2015 |
| Green Spice Tonypandy Ltd | Hospitality | 2026 |
| Greg Muszy Ltd | Transport & logistics | 2024 |
| Griffiths Allen Limited | Information & communication | 2016 |
| Griffiths Services Limited | Construction | 2019 |
| GW WOK Limited | Hospitality | 2021 |
| Gwennie House Ltd | Hospitality | 2024 |
| Gwennies Ltd | Hospitality | 2026 |
| Hadleys Homes Ltd | Real estate | 2021 |
| Happy Valley (Tonypandy) Ltd | Hospitality | 2019 |
| Harlech Property Development Ltd | Real estate | 2021 |
| Hayes Consult Ltd | Professional & scientific | 2025 |
| HD Carpentry Contractors Limited | Construction | 2016 |
| HD Residential Developments Ltd | Real estate | 2022 |
| Heartbreak Hotel Porthcawl Ltd | Hospitality | 2021 |
| Highlife Construction Limited | Real estate | 2019 |
| Holiday by Coach.Com Limited | Hospitality | 2021 |
| Hotline Labs Ltd | Information & communication | 2019 |
| House of Glam Tonypandy Limited | Other services | 2026 |
| Howard Scaffolding Limited | Construction | 2002 |
| Huntley Developments Limited | Real estate | 2022 |
| Huntley Finishes Limited | Construction | 2024 |
| Huntley Trade Specialists Limited | Construction | 2013 |
| IIS Groundworks Ltd | Construction | 2010 |
| Illuminate Aesthetics Ltd | Other services | 2023 |
| Indian Happy Bites Limited | Hospitality | 2026 |
| Indo Italian Pizza Ltd | Hospitality | 2025 |
| Intrepid Eurotek UK Ltd | Arts & recreation | 2024 |
| J & C Welding Services Ltd | Construction | 2018 |