| Megapar Holdings Ltd | Financial services | 2020 |
| Meithrin Y MÔR CIC | Agriculture & fishing | 2026 |
| Mellifera-Uk Ltd | Professional & scientific | 2023 |
| Mels Cafe Ltd | Hospitality | 2026 |
| Melyd Court (Caerwys) Management Company Limited | Professional & scientific | 2014 |
| Menna Gerrard Limited | Professional & scientific | 2004 |
| Meraki Beauty Ltd | Other services | 2022 |
| Meribel Lodges Limited | Manufacturing | 2015 |
| Meridian International Support Services Ltd | Professional & scientific | 2021 |
| Mesotier Limited | Information & communication | 2004 |
| Metakey Acoustics Ltd | Manufacturing | 2018 |
| Metric Surveys Limited | Professional & scientific | 2025 |
| MH2TECH Ltd | Professional & scientific | 2013 |
| Migion Ltd | Wholesale & retail | 2024 |
| Mike Moore Construction Ltd | Construction | 2021 |
| Mike Moore Property Ltd | Real estate | 2026 |
| Millennium Solutions (UK) Limited | Professional & scientific | 2021 |
| Millstones Property Management Limited | Real estate | 2005 |
| Millview Property (Mold) Limited | Households | 2019 |
| Mindsafety Training Services Limited | Education | 2025 |
| Mindscape Psychology Limited | Health & social care | 2015 |
| Mini Mantas Limited | Arts & recreation | 2004 |
| Misheli Ltd | Information & communication | 2021 |
| Mistral European Holidays Limited | Administrative & support | 1993 |
| Mistral Holidays UK Limited | Administrative & support | 1995 |
| Mistral Reader Holidays Limited | Administrative & support | 2008 |
| Mistral Transportation Limited | Transport & logistics | 1996 |
| Mistral Travel Limited | Administrative & support | 2006 |
| MJL Architectural Design Services Ltd | Professional & scientific | 2026 |
| MJP Evolutions Holdings Limited | Households | 2023 |
| MKR Catering Limited | Hospitality | 2017 |
| MOB Catering Ltd | Hospitality | 2019 |
| Mobot Ltd | Information & communication | 2016 |
| Mold Alexandra Football Club CIC | Arts & recreation | 2023 |
| Mold Boxing CIC | Education | 2023 |
| Mold Dessert Ltd | Hospitality | 2026 |
| Mold Development Limited | Construction | 1975 |
| Mold Fast Valeting Ltd | Administrative & support | 2021 |
| Mold Food and Drink Festival | Arts & recreation | 2009 |
| Mold Golf Club Limited | Arts & recreation | 2018 |
| Mold Home Improvement Limited | Administrative & support | 2015 |
| Mold Motor Services Ltd | Wholesale & retail | 2006 |
| Mold Rugby Football Club (Trading) Limited | Arts & recreation | 2017 |
| Mold Rugby Football Club/Clwb Rygbi YR Wyddgrug Limited | Arts & recreation | 1988 |
| Mold Shedders CIC | Other services | 2025 |
| Mold Smile Centre Ltd | Health & social care | 2025 |
| Mold Spice UK Limited | Hospitality | 2024 |
| MON Industries Limited | Administrative & support | 2020 |
| Mondex Industries Limited | Wholesale & retail | 2006 |
| MOO Music Wbloc Ltd | Education | 2017 |
| Moorland Developments (NW) Limited | Construction | 2018 |
| Moovey Limited | Professional & scientific | 2018 |
| Morb Media Ltd | Information & communication | 2023 |
| Morgan Audio Systems Limited | Manufacturing | 1994 |
| Morgan Davies Construction Limited | Construction | 2013 |
| Morris & Sharp Capital Developments Ltd | Real estate | 2026 |
| Mortgage Milestones Limited | Financial services | 2018 |
| Moster Inc Ltd | Agriculture & fishing | 2017 |
| Mountain View Windows Limited | Construction | 2025 |
| MPH Construction Limited | Construction | 1973 |
| MR Roberts Ltd | Arts & recreation | 2016 |
| MS Home Labs Ltd | Information & communication | 2025 |
| MTH Roofing and Building Services Ltd | Construction | 2021 |
| MTS Psychotherapy Limited | Health & social care | 2017 |
| Mulootaccounting.Com Limited | Professional & scientific | 2018 |
| Munro Equestrian & Tourism Ltd | Hospitality | 2021 |
| MWA and Associates Consulting Ltd | Administrative & support | 2024 |
| Mywildflower Limited | Manufacturing | 2023 |
| Mzje Ltd | Construction | 2021 |
| N W Energy Ltd | Energy | 2022 |
| N. & G. Dickens Limited | Wholesale & retail | 1975 |
| NAD Investments Ltd | Real estate | 2020 |
| Nannette Williams Limited | Extraterritorial | 2022 |
| Nant Court Management Ltd | Real estate | 2018 |
| Naru Holdings Ltd | Wholesale & retail | 2021 |
| Natural Weddings & Events Limited | Hospitality | 2022 |
| Nebula Apps Ltd | Information & communication | 2025 |
| NET Result.Uk.Com Limited | Information & communication | 2000 |
| New Horizons Trading Ltd | Wholesale & retail | 2024 |
| Newcis | Professional & scientific | 2014 |
| Newsome Homes Ltd | Real estate | 2024 |
| Nexas ERG Ltd | Public administration | 2024 |
| Nhcr Pubs Ltd | Hospitality | 2022 |
| Nice Vibes Limited | Administrative & support | 2019 |
| Niche Energy Solutions Limited | Construction | 2019 |
| Nick Crump.Stonemason Ltd | Construction | 2020 |
| Nimble Property Holbrook Ltd | Real estate | 2024 |
| Nimble Property Holdings Limited | Real estate | 2015 |
| Nimble Property Limited | Real estate | 2017 |
| Ninehouses Safety Services Limited | Public administration | 2012 |
| NJD Property Ltd | Real estate | 2024 |
| Nomad Kitchen Collective Ltd | Hospitality | 2024 |
| Noonan-Morris Ltd | Hospitality | 2026 |
| Norcoed Property Limited | Real estate | 2014 |
| North East Wales Mind Limited | Health & social care | 2008 |
| North Hills Farm Ltd | Agriculture & fishing | 2011 |
| North Wales Energy Hub Community Interest Company | Professional & scientific | 2025 |
| North Wales Tabletop Games Club Ltd. | Health & social care | 2025 |
| Northgreen Financial Services Ltd | Professional & scientific | 2020 |
| Northwest Orthotic Services Limited | Health & social care | 2014 |