| Martin John Astbury Interior Design Ltd | Hospitality | 2015 |
| Medical Money Matters Limited | Extraterritorial | 2014 |
| Mehrhaus Limited | Real estate | 2002 |
| Menter Amaethwyr Llanfihangel A'R Cylch CYF | Agriculture & fishing | 2005 |
| Mindstar Technology Ltd. | Information & communication | 2011 |
| MJ Pest Ltd | Administrative & support | 2025 |
| MJ Wind International Ltd | Energy | 2018 |
| MJR Conwy Limited | Professional & scientific | 2008 |
| MOD Pods of Conwy Ltd | Construction | 2021 |
| Moneybee Wealth Management Limited | Extraterritorial | 2020 |
| Moorings Cymru Management Company Ltd | Households | 2008 |
| Morlan Limited | Professional & scientific | 2026 |
| Mounlit View Ltd | Hospitality | 2014 |
| Mouv Reformer UK Limited | Arts & recreation | 2025 |
| Mr.Mow IT ALL Garden Services LP | | 2021 |
| MW Building Contractors (North Wales) Ltd | Construction | 2018 |
| Myrddin Davies CYF | Professional & scientific | 2018 |
| Nabum Limited | Real estate | 2016 |
| Nant-Y-Foel Cyfyngedig | Health & social care | 1987 |
| National Beekeeping Centre for Wales C.I.C. | Professional & scientific | 2010 |
| Nationwide First AID Ltd | Health & social care | 2019 |
| NCC Resources Limited | Professional & scientific | 1995 |
| Neat Brown Houses Limited | Real estate | 2019 |
| New RAJ Catering Ltd | Hospitality | 2019 |
| Newton Mount (Rhos-On-Sea) Management Company Limited | Households | 1975 |
| Nexa Property Solutions Ltd | Real estate | 2025 |
| Nicholas Welch Couriers Ltd | Transport & logistics | 2025 |
| Nick Hill Electrical Ltd | Construction | 2021 |
| North Spar Ltd | Manufacturing | 2012 |
| North Wales Computer Services Limited | Information & communication | 2007 |
| North Wales Cruising Club Ltd. | Arts & recreation | 1996 |
| North Wales Fire Suppression Systems Ltd | Construction | 2025 |
| North Wales Holiday Cottages Ltd | Administrative & support | 2015 |
| North Wales Land Rover Club Limited | Other services | 1990 |
| North Wales Trading Ltd. | Real estate | 1997 |
| Nothingtolosefilm Ltd | Information & communication | 2025 |
| Novodene Limited | Administrative & support | 2004 |
| NRJ Heating Limited | Construction | 2013 |
| Nuvista Ground & Garden Services Ltd | Administrative & support | 2023 |
| NW Station Road Ltd | Hospitality | 2026 |
| NWT Direct (Conwy) Limited | Wholesale & retail | 2018 |
| O2A Limited | Administrative & support | 2003 |
| Oak Ridge Building and Joinery Limited | Construction | 2026 |
| Ocean View (Rhos-On-Sea) Management Company Limited | Real estate | 2014 |
| Offshore Coordination Limited | Construction | 2013 |
| OHS Estates Limited | Real estate | 2025 |
| Old Colwyn (32 Endsleigh Road) Management Company Limited | Hospitality | 1999 |
| Olive & Stone Ltd | Wholesale & retail | 2025 |
| One Big Mind Ltd | Professional & scientific | 2012 |
| Ordan Group Ltd | Professional & scientific | 2026 |
| Orenda 57 Limited | Real estate | 2022 |
| Orenda Living Limited | Real estate | 2018 |
| Orenda-Luxe Limited | Hospitality | 2021 |
| Orion Hardware Ltd | Wholesale & retail | 2007 |
| Orme View Management Company Limited | Hospitality | 2003 |
| Outdoor Travel International Limited | Education | 2024 |
| Outstride Ltd | Health & social care | 2025 |
| Owen Financial Consultants Ltd | Financial services | 2021 |
| Owind Access Limited | Manufacturing | 2021 |
| Oxford Sustainable Ltd | Information & communication | 2024 |
| Oxyman (UK) Limited | Administrative & support | 2002 |
| Pabo Holdings Ltd | Real estate | 2020 |
| Padog Farms Limited | Agriculture & fishing | 2007 |
| Parkes Property Developers Ltd | Real estate | 2021 |
| Paycheck Services Limited | Professional & scientific | 1998 |
| PC Directors Limited | Administrative & support | 1998 |
| PCS 03 Limited | Financial services | 2004 |
| PCS 04 Limited | Financial services | 2004 |
| PCS 06 Limited | Financial services | 2004 |
| PCS 07 Limited | Financial services | 2004 |
| PCS 08 Limited | Financial services | 2004 |
| PCS 09 Limited | Financial services | 2004 |
| PCS 11 Limited | Financial services | 2004 |
| PCS 12 Limited | Financial services | 2004 |
| PCS 14 Limited | Financial services | 2004 |
| PCS 20 Limited | Financial services | 2004 |
| PCS 21 Limited | Financial services | 2004 |
| PCS 22 Limited | Financial services | 2004 |
| PCS 24 Limited | Financial services | 2004 |
| PCS 26 Limited | Financial services | 2004 |
| PCS 51 Limited | Financial services | 2005 |
| PCS 52 Limited | Financial services | 2005 |
| Pcss Limited | Administrative & support | 1998 |
| Peatod Tropical Solutions Limited | Wholesale & retail | 2025 |
| Penamser Limited | Professional & scientific | 2001 |
| Pendower Development Co.(Llandudno)Limited | Real estate | 1954 |
| Perfect Dreams Limited | Other services | 2005 |
| Peter T. Griffiths Limited | Construction | 2000 |
| Petrostrat Limited | Mining & quarrying | 2001 |
| Pharma Group Holdings Limited | Professional & scientific | 2004 |
| Pharma Pack Limited | Manufacturing | 2003 |
| Pharmavet Limited | Wholesale & retail | 2002 |
| Phure Liquors Ltd | Manufacturing | 2015 |
| Plas Iolyn Farm Ltd | Real estate | 2024 |
| Plush Stores Limited | Wholesale & retail | 2026 |
| Point Break Ventures Ltd | Construction | 2021 |
| Portal Financial Management Limited | Financial services | 2007 |
| Porth Eirias Marina Limited | Extraterritorial | 2018 |
| Porth Eirias Marine Limited | Extraterritorial | 2018 |
| Premier Lifting Services Limited | Administrative & support | 2010 |