| Data Maven Limited | Information & communication | 2012 |
| Dave Jones Contract Farrier Ltd | Agriculture & fishing | 2023 |
| DD HR Consulting Ltd | Professional & scientific | 2023 |
| DDH Williams Ltd | Agriculture & fishing | 2025 |
| Delineate Strategy Limited | Information & communication | 2015 |
| Dhhd CYF | Real estate | 2021 |
| Dolgaran Vineyard Ltd | Agriculture & fishing | 2025 |
| Dolgoy Cottages Limited | Hospitality | 2020 |
| Dolls House Direct Limited | Manufacturing | 2021 |
| Dorian Jones & Sons Ltd | Extraterritorial | 2016 |
| Dosbarth CYF | Administrative & support | 2016 |
| Dragon Hospitality Limited | Hospitality | 2013 |
| Dragon LAB Ltd | Professional & scientific | 2024 |
| Dragon Motorsport Wales Ltd | Wholesale & retail | 2026 |
| Dragon Shutters and Shades Ltd | Construction | 2024 |
| Draigx Football Ltd | Education | 2026 |
| Dramianga Ltd | Real estate | 2019 |
| Dream on Events & Tents Ltd | Arts & recreation | 2022 |
| DT Surveys Ltd | Professional & scientific | 2008 |
| Dulais Retreat Limited | Hospitality | 2017 |
| Dwmw Construction Ltd | Construction | 2023 |
| E & C Rees Ltd | Construction | 2015 |
| E. Evans & SON Ltd | Agriculture & fishing | 2011 |
| Eco Enviro Llandysul Limited | Agriculture & fishing | 2003 |
| Eco Farm Technology Ltd | Agriculture & fishing | 2024 |
| Eiddo NHD Properties CYF | Real estate | 2025 |
| Eiddo Sbardun CYF | Real estate | 2025 |
| EIN Cegin CIC | Agriculture & fishing | 2022 |
| Einon Developments Ltd | Construction | 2023 |
| Ellis Mills Properties Ltd | Real estate | 2023 |
| Emyr Davies A'I FAB CYF | Construction | 2003 |
| Epic Fishing Limited | Administrative & support | 2012 |
| Equine Marketing Limited | Information & communication | 1991 |
| Equine Podiatry Management Ltd | Agriculture & fishing | 2023 |
| Erwan Fawr Ltd | Hospitality | 2023 |
| Essex Corporation Limited | Financial services | 2026 |
| Euros Davies Limited | Administrative & support | 2014 |
| Evetts Legal Ltd. | Professional & scientific | 2016 |
| Fedwen Catering Limited | Hospitality | 2024 |
| Fedwen Event Bars Ltd | Hospitality | 2022 |
| Fedwen Merchandise Limited | Wholesale & retail | 2024 |
| Fedwen Tentage Limited | Administrative & support | 1978 |
| Fedwen Wholesale Limited | Wholesale & retail | 2024 |
| Feet-Matter-Ceredigion LLP | | 2024 |
| Ffab Cyfyngedig | Wholesale & retail | 2014 |
| Ffostrasol Arms Limited | Hospitality | 2012 |
| Fiscal Horizon Ltd | Professional & scientific | 2026 |
| Fishtravel Ltd | Administrative & support | 2021 |
| Four Point One Limited | Construction | 2014 |
| Friarly Vets Ltd | Professional & scientific | 2023 |
| Gampa Limited | Professional & scientific | 2025 |
| Geoff Farmer Liquid Screeding Ltd | Construction | 2018 |
| Gernos Enterprises Ltd | Agriculture & fishing | 2024 |
| Gethin Davies Building Ltd | Construction | 2023 |
| Gilfachlas Active Community CIC | Education | 2026 |
| Glynmelyn Investments Limited | Construction | 2018 |
| GMI Carpentry Ltd | Construction | 2023 |
| Goforest Engineering Ltd | Professional & scientific | 2024 |
| Gomer Press Limited | Manufacturing | 1947 |
| Green Rocket Futures C.I.C. | Administrative & support | 2016 |
| Green Rocket Group Ltd | Information & communication | 2018 |
| Gwawr Owen CYF. | Information & communication | 2002 |
| Gwawrfryn Dachshunds Ltd | Agriculture & fishing | 2019 |
| Gwili Pottery Ltd | Wholesale & retail | 2010 |
| Gwybodus CYF. | Public administration | 2020 |
| Heads and Tails Soft Furnishings Ltd. | Manufacturing | 2017 |
| Health Leads UK Ltd | Manufacturing | 1997 |
| Hear Aberystwyth CYF | Wholesale & retail | 2024 |
| Height Safety (Inspections & Solutions) Ltd | Construction | 2019 |
| Heinis Beautique Ltd | Other services | 2019 |
| Helyg Heating Ltd | Construction | 2021 |
| HFN Clettwr CYF | Real estate | 2018 |
| HHR Ltd | Hospitality | 2016 |
| Highway Garage (Llandysul) Ltd | Wholesale & retail | 2019 |
| Hiraeth and Hearth Ltd | Real estate | 2026 |
| Historical Carpentry Renovation Wales Ltd | Construction | 2023 |
| Hydro Electric Barrels Ltd | Manufacturing | 2019 |
| Hyperhidrosis Resolutions Limited | Other services | 2025 |
| IAN Williams Associates Limited | Professional & scientific | 2013 |
| Icer Services Limited | Information & communication | 2011 |
| Ifan Evans Farriery Ltd. | Other services | 2024 |
| Inclusive Leadership Ltd | Professional & scientific | 2019 |
| Indiekey Limited | Information & communication | 2024 |
| Industry Council for Electronic Equipment Recycling Limited | Administrative & support | 1996 |
| Inspiring Property Solutions Limited | Real estate | 2019 |
| Interim Safety Systems Ltd | Construction | 2014 |
| J. Lewis TSP Limited | Transport & logistics | 2002 |
| J. Sharkey Trading Ltd | Agriculture & fishing | 2025 |
| JD Miller Ltd | Wholesale & retail | 2019 |
| JIC Consulting Limited | Professional & scientific | 2017 |
| Jig-So Hire CYF | Other services | 2026 |
| Jones LET Ltd | Real estate | 2025 |
| Joy Chen Chinese Limited | Hospitality | 2024 |
| Jukes Brothers Limited | Real estate | 2023 |
| K a Electrical Services Limited | Construction | 2021 |
| K R Wilcox Limited | Professional & scientific | 2011 |
| K&L Platinum Protection Ltd | Administrative & support | 2025 |
| Karibi Investments Limited | Information & communication | 2005 |
| Kawasaki Europe Limited | Wholesale & retail | 2025 |
| Killerwatts Marketing Ltd | Professional & scientific | 2019 |