| First Hydro Company | Energy | 1989 |
| First Hydro Holdings Company | Professional & scientific | 1995 |
| Fledgling Communications Limited | Administrative & support | 2008 |
| Fourtune Developments Ltd | Real estate | 2025 |
| Fron Goch Garden Centre Limited | Wholesale & retail | 2002 |
| Fullmarks School of Motoring Ltd | Other services | 2012 |
| G. L. Jones Playgrounds Ltd. | Manufacturing | 1987 |
| G. Quaeck & Co. Limited | Wholesale & retail | 1965 |
| G.W. Johnson Limited | Construction | 2007 |
| Gair (Cymru) CYF | Professional & scientific | 2007 |
| Gamlins Limited | Professional & scientific | 1998 |
| Garmen Limited | Professional & scientific | 2003 |
| Genesis Uk.Com Limited | Manufacturing | 2006 |
| Geraint Hughes Ltd | Transport & logistics | 2025 |
| Gews Transport Limited | Wholesale & retail | 2002 |
| Glanllyn Limited | Agriculture & fishing | 2007 |
| Globe City Limited | Hospitality | 2023 |
| Glyn Owen A'I Gwmni Cyfyngedig | Construction | 2007 |
| Greaves Welsh Slate Company Limited | Professional & scientific | 1983 |
| Gwastraff Cymru Limited | Water & waste | 2007 |
| Gwyndaf Hughes Limited | Construction | 2008 |
| Gwynedd Cash Registers Ltd | Manufacturing | 2006 |
| Gwynedd Communications Limited | | 1990 |
| Gwynedd Environmental Waste Services Limited | Water & waste | 2002 |
| Gwynfryn Farm Holidays Limited | Agriculture & fishing | 1962 |
| H Tudor A'I FAB CYF | Real estate | 2006 |
| H. Jones & Sons (Contractors) Limited | Construction | 2004 |
| H.N.H. Holdings Limited | Administrative & support | 1964 |
| H.O.Davies Limited | Other services | 1972 |
| HAF Roberts CYF | Professional & scientific | 2022 |
| Hardy's Recovery Limited | Wholesale & retail | 2003 |
| Harrison Plant Hire (Trefor) Ltd | Administrative & support | 2025 |
| Heidro Harnog CYF | Energy | 2003 |
| HEN Felin Cottages Limited | Hospitality | 2012 |
| Henry Jones (Criccieth) Limited | Construction | 1972 |
| Highrail Systems Limited | Manufacturing | 2006 |
| Holmework Limited | Agriculture & fishing | 1997 |
| I T D Contracting Limited | Administrative & support | 2005 |
| IAN Ambrose Limited | Construction | 2009 |
| IN10DED Ltd | Information & communication | 2019 |
| Iolo Ellis CYF | Wholesale & retail | 2020 |
| J.C. Wholey Plant Hire Limited | | 1986 |
| J.W.Greaves & Sons,Limited | Real estate | 1900 |
| JL Edwards Holdings Ltd | Financial services | 2025 |
| Jones & Evans Agricultural Limited | | 1975 |
| K G Editorial Ltd | Information & communication | 2018 |
| Kensington Hotel (Llandudno) Ltd | Hospitality | 2003 |
| Kevron Sports Limited | Real estate | 1978 |
| LA Pizza NI Felin CYF | Manufacturing | 2017 |
| LA Sande Investments Limited | Professional & scientific | 1989 |
| Lemontran Limited | Transport & logistics | 1991 |
| Lewis Jones Care Limited | Health & social care | 2001 |
| Lewis Property Investments Limited | Financial services | 2014 |
| Linksale Limited | Real estate | 1983 |
| Liverpool Arms Hotel Limited | Hospitality | 2002 |
| Llandudno Junction Community Club Limited | Arts & recreation | 2007 |
| Llechi'R Ddraig CYF | Manufacturing | 2007 |
| Llety Alaw CYF | Real estate | 2025 |
| Llwyn TEG Caravan Park Limited | Hospitality | 2003 |
| Llyn Car Sales Ltd | Wholesale & retail | 2025 |
| Llyn Pilgrim Way Holidays Ltd | Hospitality | 2002 |
| Loftlord Limited | Wholesale & retail | 1984 |
| M E Strom Limited | Professional & scientific | 2005 |
| Maelan Caravan Park Ltd | Hospitality | 1999 |
| Maes Carafanau Waenfach CYF | Hospitality | 2003 |
| Mair (Bangor) Limited | | 1965 |
| Major R. Owen Limited | Wholesale & retail | 1989 |
| Malcolm Roberts Limited | Construction | 2006 |
| Mandal Services Limited | Education | 2012 |
| Martin Roberts Construction Limited | Construction | 2003 |
| Medina Coffee House Limited | Hospitality | 2007 |
| Metro Petroleum (Sales) Limited | | 1982 |
| MIN Y Nant Stores Limited | Wholesale & retail | 2006 |
| Mint Safety Services Limited | Professional & scientific | 2006 |
| Modurdy Henblas Garage Limited | Wholesale & retail | 2005 |
| Moncrieffe Limited | Other services | 2007 |
| Mountain Ventures Limited | Other services | 1981 |
| Mountain Water Takeaway Ltd. | Hospitality | 2005 |
| Mouseloft Ltd | Real estate | 2005 |
| Myti Mussels Limited | Agriculture & fishing | 1987 |
| N P S Limited | Construction | 1990 |
| Nanhoron Farms Limited | Agriculture & fishing | 2002 |
| Nefyn Foods Limited | Administrative & support | 1978 |
| Nefyn Holidays Limited | Hospitality | 2022 |
| Noor Luxe Ltd | Other services | 2026 |
| NRG Construction Services Limited | Real estate | 2004 |
| O G Owen & Sons Ltd | Wholesale & retail | 2005 |
| Odyssey Ltd | Professional & scientific | 2001 |
| Offshore Sea School (Gwynedd) Limited | Other services | 2019 |
| Owens Slate Services Limited | Manufacturing | 2000 |
| P.M.C. (Llanbedrog)Limited | Households | 1982 |
| P.R. Thomas Agriculture Limited | Manufacturing | 2003 |
| Pace Fire Electrical Ltd | Extraterritorial | 2018 |
| Pace Fire Risk Assessments Limited | Administrative & support | 2009 |
| Pant Waen Garage Ltd | Wholesale & retail | 2006 |
| Pantri Llanberis Ltd | Hospitality | 2020 |
| Parc Morfa Limited | Construction | 2001 |
| Park Investments Ltd. | Hospitality | 2000 |
| Partneriaeth Seiont Partnership LLP | | 2007 |
| Pastimes and Amusements (Barmouth) Limited | Arts & recreation | 1963 |