| Edwards Power & Lighting Limited | Information & communication | 2014 |
| Egni Eryri Energy Ltd | Professional & scientific | 2026 |
| Eiddo CTL CYF. | Real estate | 2025 |
| Eiddo Haws CYF | Real estate | 2024 |
| Eiddo ITJ Properties CYF | Real estate | 2017 |
| Eiddo M&T CYF | Real estate | 2024 |
| Eiddo Parry CYF | Real estate | 2025 |
| Eiddo RP Properties CYF | Real estate | 2020 |
| Eiddo RSP Properties CYF | Real estate | 2024 |
| Eiri CYF | Agriculture & fishing | 2017 |
| Ejslater Ltd | Information & communication | 2019 |
| Elite Colours ABR Ltd | Wholesale & retail | 2024 |
| Eltec Autoparts Ltd | Wholesale & retail | 2026 |
| Emrys Williams Brickwork Contractor Ltd | Construction | 2008 |
| Emyr Evans Holdings CYF | Wholesale & retail | 2025 |
| Emyr Mortimer CYF | Professional & scientific | 2021 |
| EOS - YR Asiantaeth Hawliau Darlledu Cyfyngedig | Other services | 2012 |
| ERS Steel Properties Ltd | Construction | 2025 |
| Eryri CAD Services Limited | Professional & scientific | 2007 |
| Eryri Consulting Limited | Information & communication | 2016 |
| Eryri Cydweithredol - Eryri Co-Operative CYF | Health & social care | 2020 |
| Eryri Design Ltd | Professional & scientific | 2025 |
| Eryri Scaffolding Ltd | Construction | 2015 |
| Essem Group Limited | Administrative & support | 2022 |
| Estheteg Awen HAF Aesthetics Ltd | Health & social care | 2020 |
| ETH 2019 Limited | Transport & logistics | 2019 |
| ETO & ETO Limited | Wholesale & retail | 2021 |
| Evermore Academy Ltd | Health & social care | 2012 |
| Evoke Adventure Limited | Arts & recreation | 2023 |
| FAE Properties Ltd | Real estate | 2023 |
| Felin Saeri AG Adeiladwyr Joinery and Building Contractors Ltd | Manufacturing | 2023 |
| Ffeind CYF | Health & social care | 2024 |
| Fferm TY Cerrig Limited | Agriculture & fishing | 2023 |
| Ffika CYF. | Hospitality | 2015 |
| Ffonic Ltd | Information & communication | 2025 |
| First Class CUT Master Limited | Other services | 2022 |
| Flavorfog Catering Ltd | Hospitality | 2025 |
| Flavorfog Ltd | Hospitality | 2024 |
| Flavorfog Takeaway Ltd | Hospitality | 2024 |
| FOR US Collective CIC | Education | 2026 |
| Framed Cycles Ltd | Wholesale & retail | 2013 |
| Freedom Outdoors (UK) Ltd | Arts & recreation | 2024 |
| Full Moon Photography Ltd | Professional & scientific | 2023 |
| Funky Starfish Limited | Wholesale & retail | 2012 |
| Fussy Bird Limited | Other services | 2025 |
| G & H Car & Commercial Limited | Wholesale & retail | 2007 |
| G a Hughes A'I Gwmni Cyfyngedig | Construction | 2014 |
| G Parry Electrical Services Ltd | Construction | 2014 |
| G Prytherch Ltd | Information & communication | 2019 |
| G Roberts Saer Coed Joinery Ltd | Construction | 2025 |
| G V Joinery & Building Contractor Limited | Construction | 2024 |
| G.N.H. Agri Limited | Manufacturing | 2000 |
| G.W.Vermin Control Ltd | Agriculture & fishing | 2026 |
| Galactig CYF | Information & communication | 2024 |
| Galaxy Cell and Repair Ltd | Wholesale & retail | 2022 |
| Galeri Caernarfon CYF | Real estate | 1992 |
| Galwedigaeth / Occupation Ltd | Health & social care | 2015 |
| Gardner Rentals Limited | Real estate | 2024 |
| Garej Iwan CYF | Wholesale & retail | 2019 |
| Gareth Williams Marine Services Limited | Construction | 2013 |
| Garn Data CYF. | Information & communication | 2022 |
| Geoffb Medical Limited | Other services | 2015 |
| Geoslate Ltd | Mining & quarrying | 2026 |
| Gerddi a Coed Gwynedd Ltd | Administrative & support | 2024 |
| Gigatel Cyfyngedig | Arts & recreation | 1994 |
| Giles Elliott Tree Surgery Limited | Administrative & support | 2023 |
| Gisda Cyfyngedig | Health & social care | 1990 |
| Glan Gwna Estates Limited | Hospitality | 1974 |
| Glaslyn Ices Ltd | Wholesale & retail | 2006 |
| Glaslyn Limited | Hospitality | 2018 |
| GLR Groundwork’S and Plant Hire Ltd | Construction | 2024 |
| Gmguides Ltd | Arts & recreation | 2022 |
| Go Find Technologies Ltd | Professional & scientific | 2026 |
| Gofaint CYF. | Real estate | 2020 |
| Gofal a Thrwsio Conwy a SIR Ddinbych | Health & social care | 2015 |
| Gofal BRO CYF | Other services | 2008 |
| Gogglebocs Cymru CYF | Information & communication | 2022 |
| Golden Fade Stylist Ltd | Other services | 2023 |
| Goldenfireflies Limited | Administrative & support | 2024 |
| GP Catering Ltd | Hospitality | 2025 |
| GR Housing Limited | Real estate | 2025 |
| Grandmanor Limited | Real estate | 1996 |
| Grays Search & Selection Ltd | Administrative & support | 2015 |
| Greasley Family Investment Company | Financial services | 2026 |
| Great Adventures UK Ltd | Arts & recreation | 2007 |
| Great White INK Limited | Other services | 2020 |
| Greener Edge Ltd | Professional & scientific | 2018 |
| Gringo Design Ltd | Professional & scientific | 2011 |
| Gsph Ltd | Water & waste | 2024 |
| Guto Roberts CYF | Agriculture & fishing | 2018 |
| Gwaddol Iola Ltd | Arts & recreation | 2018 |
| Gwalch CYF | Construction | 2015 |
| Gwanwyn Ltd | Other services | 2021 |
| Gwasanaeth Cerdd Ysgolion Gwynedd a MÔN | Education | 1995 |
| Gwasanaethau Adeiladu a Chyfleustodau WR Construction and Utility Services Limited | Construction | 2026 |
| Gwasanaethau Sain CBC | Administrative & support | 2019 |
| Gwasg Y Bwthyn CYF | Information & communication | 2003 |
| GWD Thing CYF | Arts & recreation | 2022 |
| Gwennol Media Limited | Information & communication | 2023 |
| Gwilym Huws Limited | Arts & recreation | 2015 |