| FBA Group Limited | Extraterritorial | 2003 |
| FBA Media Limited | Information & communication | 2002 |
| Felin Hedd Country Holidays CYF | Hospitality | 2011 |
| Ffigar Sports Ltd | Manufacturing | 2015 |
| Fflam Frongoch Limited | Agriculture & fishing | 2005 |
| Ffrwd Cyfyngedig | Professional & scientific | 2022 |
| Fibre Survey Services Ltd | Information & communication | 2017 |
| Fire Alarm & Electrical Services Ltd | Construction | 2026 |
| Fire in the Mountain Festival Limited | Arts & recreation | 2012 |
| First Hydroponics Limited | Wholesale & retail | 2013 |
| Fit Fuel Aberystwyth Ltd | Hospitality | 2025 |
| Flying Dutchman Ltd | Hospitality | 2021 |
| Flywithus Aviation Limited | Administrative & support | 2024 |
| Fossey Properties Limited | Real estate | 2023 |
| FUW Holdings Limited | Financial services | 2026 |
| FUW Insurance Services Limited | Financial services | 2012 |
| FUW Properties Limited | Real estate | 2011 |
| G Church Security Ltd | Administrative & support | 2025 |
| G Pugh-Jones Electrical and Building Ltd. | Construction | 2010 |
| G.A.R.X Ltd | Hospitality | 2022 |
| GAD Property & Finance Limited | Real estate | 1995 |
| Garej Davmor Ltd | Wholesale & retail | 2021 |
| Garry Davies Accident Repairs Limited | Wholesale & retail | 2015 |
| Garys Cabs (2013) Limited | Transport & logistics | 2013 |
| Gdmr Digital Ltd | Information & communication | 2017 |
| Gelli Property Ltd | Real estate | 2024 |
| Ger-Y-Gors Projects Limited | Information & communication | 2010 |
| Getreal Social Ltd | Information & communication | 2026 |
| GJL Education Ltd | Education | 2025 |
| Glan-Y-Gors CYF | Real estate | 2017 |
| Glanclean Ltd | Professional & scientific | 2017 |
| Glanhau Aber Cleaning Ltd | Administrative & support | 2021 |
| Glenfit Properties Limited | Households | 1961 |
| Goexplorecamping Ltd | Hospitality | 2021 |
| Gofal Ystwyth Care Limited | Health & social care | 2017 |
| Gofal Ystwyth Holdings Limited | Financial services | 2023 |
| Gogerddan Child Care Ltd | Education | 2012 |
| Gogerddan Garage Limited | Wholesale & retail | 2026 |
| Golden Coast Sporting Villas Limited | Hospitality | 1975 |
| Golden June Limited | Wholesale & retail | 2024 |
| Goose Internet Ltd | Information & communication | 2015 |
| Gosen Construction Limited | Construction | 2025 |
| GPK Games Ltd | Wholesale & retail | 2024 |
| Graham's Vehicle Repairs Ltd | Wholesale & retail | 2018 |
| Great Welsh Land Limited | Administrative & support | 2005 |
| Green Valley Leisure Ltd | Hospitality | 2014 |
| Greenhouse Rental Properties Limited | Administrative & support | 2024 |
| Greenhouse Scaffolding Limited | Construction | 2014 |
| Greenlands Estates Limited | Financial services | 2007 |
| Greenlands Finance Limited | Extraterritorial | 2005 |
| Greenlands Insurance Services Limited | Financial services | 1998 |
| Grindrod & Company Limited | Professional & scientific | 2003 |
| Grwp Cymunedol Blaenplwyf Community Group CYF | Wholesale & retail | 2002 |
| Gunsafe Ltd | Extraterritorial | 2019 |
| Gwalia Management Company Limited | Households | 1996 |
| Gwastad Lane Management Company Limited | Households | 2024 |
| GWE Cambrian Web CYF | Information & communication | 2015 |
| Gweithdai Bryneithin CYF | Real estate | 2022 |
| Gweledol CYF | Other services | 2012 |
| GWESTY2022 Ltd | Hospitality | 2022 |
| Gwylliaid Cochion Ltd | Information & communication | 2024 |
| Gwyn Hafan Management Company Ltd | Real estate | 2009 |
| Gwynfil Holdings Ltd | Real estate | 2017 |
| Gwynne Davey Properties Ltd | Real estate | 2024 |
| Gŵylborthffest CBC | Arts & recreation | 2024 |
| H & a R Ellis CYF | Construction | 2022 |
| H D Construction (Wales) Limited | Construction | 2011 |
| H Martin Thomas Ltd | Construction | 2026 |
| Hafan Artro Ltd | Hospitality | 2017 |
| Hafren Ousque Associates Ltd | Professional & scientific | 2015 |
| HAG Reclaimed Ltd | Other services | 2026 |
| HAI Yang Fast Food Limited | Hospitality | 2023 |
| Haka Entertainment Limited | Arts & recreation | 2017 |
| Happi's Place Ltd | Wholesale & retail | 2024 |
| Happy Delight Limited | Hospitality | 2023 |
| Hapusmor Ltd | Extraterritorial | 2024 |
| Harlequinade C.I.C. | Information & communication | 2024 |
| Hawkestone Ltd | Administrative & support | 2014 |
| Hayward Electrical (Wales) Limited | Construction | 2012 |
| HCC3D Ltd | Manufacturing | 2023 |
| Health Books UK Ltd | Wholesale & retail | 2000 |
| Healy and Phillips Developers Ltd | Real estate | 2015 |
| Hefin Morgan Steel Framed Buildings Ltd | Manufacturing | 2023 |
| Helixal Ltd | Wholesale & retail | 2024 |
| Helpful Investments Limited | Administrative & support | 1959 |
| Hendre Aberystwyth Ltd | Real estate | 2026 |
| Hidden Jewel Holidays Ltd | Hospitality | 2020 |
| Highlights Care Limited | Health & social care | 2026 |
| Hill View Cabins Ltd | Hospitality | 2021 |
| Hivos UK Ltd | Wholesale & retail | 2026 |
| Hiwse Ltd | Real estate | 2014 |
| HJ and HS Farms Ltd | Wholesale & retail | 2026 |
| HK GLOBALMART19 Ltd | Wholesale & retail | 2026 |
| Hobrok Consultant Anaesthetists Limited | Health & social care | 2022 |
| Hollywood Foods Limited | Hospitality | 2025 |
| Home Cafe Ltd | Hospitality | 2026 |
| Homely Basket Ltd | Wholesale & retail | 2025 |
| Hopforge Ltd | Manufacturing | 2014 |
| Horeb Properties Limited | Real estate | 2011 |
| Hot Dumplings 66 Limited | Hospitality | 2024 |