| Middle Shop Limited | Wholesale & retail | 2003 |
| Midland Groundworks Limited | Construction | 1993 |
| Midlands Food Wholesale Ltd | Manufacturing | 2024 |
| Miim Media Ltd | Information & communication | 2021 |
| Mike Evans (Windows) Ltd | Construction | 2006 |
| Mike Griffiths & Partners Ltd | Professional & scientific | 2008 |
| Mike Mcgrath Instruments Limited | Administrative & support | 2013 |
| Mike Potts Light Haulage Limited | Transport & logistics | 2016 |
| Mike Pryde Electrical Services Limited | Construction | 1999 |
| Mikenaite Limited | Health & social care | 2018 |
| Milebarn Ltd | Wholesale & retail | 2023 |
| Millstone Park Limited | Hospitality | 1997 |
| Milner Engineering Services Limited | Manufacturing | 2009 |
| Milo Development Ltd | Construction | 2024 |
| Mindkey Therapy Ltd | Health & social care | 2022 |
| Minera MOT Centre Limited | Wholesale & retail | 2018 |
| Minera Studios Foundation Limited | Information & communication | 2025 |
| Minera Studios Ltd | Information & communication | 2024 |
| Mini & Jones Limited | Manufacturing | 2019 |
| Mint Electronic Security and Fire Limited | Administrative & support | 2017 |
| Mint Fencing & Groundworks Ltd | Construction | 2023 |
| Mirabeau Solutions Ltd | Administrative & support | 2011 |
| Mirage Automotive Developments Ltd | Wholesale & retail | 2016 |
| Mitch Bird-Jones Contracting Limited | Water & waste | 2025 |
| MJ Bakery Solutions Limited | Manufacturing | 2015 |
| MJ Express Logistics Ltd | Transport & logistics | 2026 |
| MJB Joinery and Building Limited | Construction | 2020 |
| MJW121SERVICES Ltd | Transport & logistics | 2015 |
| Mkap Limited | Transport & logistics | 2014 |
| Mkrs Capital Limited | Financial services | 2024 |
| MLH Group Limited | Financial services | 2026 |
| Mlwbrickwork Ltd | Construction | 2025 |
| MM Garage Ltd | Wholesale & retail | 2019 |
| MM Lettings Cleaning Ltd | Administrative & support | 2020 |
| Mm&Hp Limited | Households | 2026 |
| MMG Fleet Services Limited | Extraterritorial | 2025 |
| Mobile ECU Remapping Limited | Extraterritorial | 2010 |
| Mobile Optical (Wrexham) Limited | Health & social care | 2009 |
| Mobile UP Ltd | Other services | 2019 |
| Mobile Xperts Ltd | Other services | 2012 |
| MOBILE360 Ltd | Wholesale & retail | 2024 |
| Mobility Living Solutions Limited | Extraterritorial | 2010 |
| Model Car Shop Ltd | Wholesale & retail | 2023 |
| Molhashop Ltd | Wholesale & retail | 2025 |
| Molyneux Money Matters Limited | Financial services | 1987 |
| Mombies Parent Support Group Limited | Other services | 2024 |
| Momentum Sales and Marketing Limited | Professional & scientific | 2025 |
| Monabri Construction Ltd | Construction | 2017 |
| Monabri Properties Limited | Real estate | 2022 |
| Moneysprite North Wales Ltd | Financial services | 2025 |
| Monopolio Investments Limited | Real estate | 2021 |
| Monopoly (North West) Limited | Real estate | 2016 |
| Monopoly Buy Sell Rent Lettings Limited | Real estate | 2017 |
| Monopoly Buy Sell Rent Limited | Real estate | 2016 |
| Moohla Labs Ltd | Information & communication | 2025 |
| MOP Stars Support Limited | Administrative & support | 2025 |
| Moran Group Ltd | Real estate | 2025 |
| More Than Education C.I.C. | Education | 2020 |
| More Than MOW and Go Limited | Administrative & support | 2007 |
| Morehumanconsulting CYF. | Administrative & support | 2025 |
| Moreton Hall 2100 Limited | Financial services | 2026 |
| Moretube Engineering Limited | Manufacturing | 2004 |
| Morgan Body and Paint Ltd | Other services | 2019 |
| Morgzphotography Ltd | Professional & scientific | 2025 |
| Morland Consultancy LLP | | 2008 |
| Morland Developments Limited | Construction | 2008 |
| Morley's Mazda's Ltd | Wholesale & retail | 2022 |
| Morris Portraits Limited | Professional & scientific | 2010 |
| Morton & Jones Holdings Limited | Financial services | 2019 |
| Morton & Jones Limited | Construction | 2008 |
| Moss Homes (Wrexham) Limited | Construction | 2018 |
| Mossfords Memorials Limited | Manufacturing | 2006 |
| Mosswood Property Limited | Hospitality | 2025 |
| Mother Goose (Wrexham) Ltd | Health & social care | 2012 |
| MOTIV8.ME Ltd | Information & communication | 2014 |
| Motivated Mums & Dads CIC | Health & social care | 2023 |
| Moto Trends Ltd | Wholesale & retail | 2023 |
| Motobomb Ltd | Information & communication | 2026 |
| Mottram Gardens (Llay) Management Company Ltd | Households | 2019 |
| Mountain Garden Botanics Ltd | Wholesale & retail | 2020 |
| Mountain Gate Limited | Professional & scientific | 2020 |
| Mountforce Ltd | Wholesale & retail | 2025 |
| MP Estate Management Ltd | Professional & scientific | 2025 |
| MP Exterior Care Ltd | Administrative & support | 2026 |
| MPD Developments (NW) Limited | Construction | 1982 |
| MPE Air Conditioning Limited | Construction | 2024 |
| MPE Fire & Security Limited | Construction | 2024 |
| MPM Sourcing Solutions Ltd | Wholesale & retail | 2024 |
| MR Cleaning Line Ltd | Administrative & support | 2018 |
| MR Tee's Wrexham Ltd | Manufacturing | 2024 |
| MRJ Engineering Ltd | Construction | 2022 |
| MS Beauty Barbers Ltd | Other services | 2026 |
| MS Wrexham CIC | Health & social care | 2023 |
| MSC Technology Services Limited | Information & communication | 2017 |
| MSH Telecoms Limited | Construction | 2024 |
| Msmj Ltd | Financial services | 2022 |
| MSN Fencing & Groundwork Ltd | Construction | 2021 |
| MTE Properties Limited | Real estate | 2020 |
| MTS Groundworks Ltd | Mining & quarrying | 2018 |
| Mulberry Blinds Ltd | Manufacturing | 2013 |