| Firstline Resin Flooring Limited | Construction | 2020 |
| Flea for ALL Ltd | Administrative & support | 2013 |
| Fleece and Woodland Retreats Ltd | Administrative & support | 2026 |
| Floodgate Americas Limited | Wholesale & retail | 2003 |
| Flows Cafe Bar Llandeilo Limited | Hospitality | 2025 |
| Flows Catering Limited | Hospitality | 2025 |
| Floxa Ltd | Information & communication | 2026 |
| FNE Capital Ltd | Financial services | 2026 |
| FNE Distributions Ltd | Wholesale & retail | 2025 |
| Food on the Move Caterers Limited | Hospitality | 2011 |
| Forest Arms CYF | Hospitality | 2023 |
| Forever and Alwayz Ltd | Other services | 2016 |
| Forge Farm Machinery Limited | Wholesale & retail | 2023 |
| Forstyle Assets L.P. | | 2018 |
| Fort Merlin Properties Ltd | Real estate | 2026 |
| Fortunes Valley Ltd | Hospitality | 2022 |
| Four Saints Ltd | Health & social care | 2022 |
| Fourjays Automotive Limited | Administrative & support | 2016 |
| Framenet Online Limited | Wholesale & retail | 2024 |
| Fraser Glaze Limited | Construction | 1999 |
| Freak Athletics Ltd | Wholesale & retail | 2016 |
| Frimbles Farm Ltd | Administrative & support | 2025 |
| Fronhaul & Brookfield Care Home Limited | Health & social care | 2007 |
| Frys Furnishings Limited | Wholesale & retail | 2021 |
| FT Law Ltd | Professional & scientific | 2022 |
| Fusion Fitness Whitland Limited | Arts & recreation | 2025 |
| Fusion Signage Ltd | Manufacturing | 2024 |
| Future Business Intelligence Limited | Administrative & support | 2006 |
| G D Howells Ltd | Agriculture & fishing | 2021 |
| G P Kinsey Building Services Limited | Construction | 2017 |
| G W Phillips Electrical Limited | Construction | 2022 |
| G W Williams Contracting Ltd | Agriculture & fishing | 2012 |
| G. Williams and Sons Monumental Masons Limited | Wholesale & retail | 2000 |
| G. Williams Properties Limited | Real estate | 2000 |
| G.Davies Property Ltd | Real estate | 2025 |
| G.L.P. Evans Limited | Agriculture & fishing | 2002 |
| Gaia Remedies Ltd | Wholesale & retail | 2021 |
| Gails Plaice Pendine Limited | Hospitality | 2024 |
| Galena 2 Limited | Health & social care | 2011 |
| Garan Farms Ltd | Agriculture & fishing | 2016 |
| Garej Gellynewydd Ltd | Wholesale & retail | 2013 |
| Gareth B. James Limited | Administrative & support | 2002 |
| Gareth King Physiotherapy Limited | Health & social care | 2012 |
| Gareva Ltd | Construction | 2025 |
| Garside Trading Limited | Hospitality | 2025 |
| Gatm Holdings Ltd | Administrative & support | 2022 |
| GB Energy Limited | Construction | 2013 |
| GBS Plastering & Rendering Ltd | Construction | 2020 |
| GELATO44 Ltd | Wholesale & retail | 2024 |
| Gelli AUR Domiciliary Care Ltd | Health & social care | 2022 |
| Gelliaur Care Limited | Health & social care | 2015 |
| Genesis Maintenance Services (Wales) Limited | Construction | 2012 |
| George's of ST Clears Ltd | Hospitality | 2021 |
| Geraint Jones 4 X 4 Limited | Wholesale & retail | 2011 |
| GET Stitched Embroidery Ltd | Other services | 2019 |
| Gfhearne Ltd | Transport & logistics | 2016 |
| GFX Trading Limited | Education | 2024 |
| GHB Productions Ltd | Manufacturing | 2021 |
| Gibbon Resin Ltd | Administrative & support | 2026 |
| Gibson & Jones Vets Ltd | Professional & scientific | 2022 |
| Gilbern Devco Limited | Construction | 2024 |
| Gilbern Propco Limited | Real estate | 2024 |
| GIW Properties Ltd | Real estate | 2024 |
| GJ Hire Ltd | Administrative & support | 2023 |
| Glanant CYF | Energy | 2011 |
| Glancothi Property Management Limited | Households | 2018 |
| Glangwendraeth Ltd | Water & waste | 2011 |
| Glanmedeni Ltd | Wholesale & retail | 2018 |
| Glanmor Davies Evans & SON Ltd | Other services | 2011 |
| Glasallt Fawr Trading Limited | Agriculture & fishing | 2015 |
| Glasbren CIC | Agriculture & fishing | 2019 |
| Glasfryn Farmhouse Ltd | Agriculture & fishing | 2007 |
| Global Bridge Labs Limited | Information & communication | 2026 |
| Global Futures Alliance Ltd | Education | 2024 |
| Globe House Ltd | Construction | 2021 |
| GLT & SON Roofing Services Limited | Construction | 2009 |
| GLT Land Holdings Limited | Financial services | 2022 |
| Glynhebog Ltd | Real estate | 2023 |
| GMT Locum Services Ltd | Professional & scientific | 2023 |
| GNE Phillips Ltd | Manufacturing | 2023 |
| Go Ahead Traffic Management Ltd | Administrative & support | 2022 |
| Go Sport and Leisure Ltd | Arts & recreation | 2024 |
| Gobuziness Ltd | Professional & scientific | 2022 |
| Goiawn Ltd | Information & communication | 2024 |
| Golden Grove Country Cottages Ltd | Hospitality | 2021 |
| Golden Grove Trust | Arts & recreation | 2011 |
| Golden Grove Ventures Limited | Hospitality | 2015 |
| Goldpoint Projects PC | | 2019 |
| Goldstone Bookshops Limited | Wholesale & retail | 2018 |
| Golygfa Tywi Freehold Management Co Limited | Administrative & support | 2007 |
| Good Things Gifts Limited | Wholesale & retail | 2019 |
| Gorau Investments Limited | Construction | 2024 |
| Gordons Garage Limited | Wholesale & retail | 2018 |
| Gors Limited | Agriculture & fishing | 2015 |
| GP Architecture Studio Ltd | Professional & scientific | 2024 |
| GP Tyre Recycling Ltd | Water & waste | 2022 |
| Gp-Autos Carmarthen Ltd | Wholesale & retail | 2020 |
| Gpio Systems Limited | Information & communication | 2017 |
| GR Waldron Consultancy Limited | Professional & scientific | 2015 |
| Grand Prix Offroad Limited | Wholesale & retail | 2002 |