| Llangedwyn Enterprises Limited | Real estate | 2019 |
| Llwyn Derw Limited | Real estate | 2016 |
| Llyr Consulting Ltd | Transport & logistics | 2024 |
| Llys Ioan Ltd | Construction | 2019 |
| Llys Marl Development Limited | Construction | 2018 |
| LNL Motors (NW) Ltd | Other services | 2018 |
| Locked OUT North Wales Limited | Wholesale & retail | 2025 |
| Loman Cavendish Limited | Information & communication | 2007 |
| LON Derw Ltd | Households | 2025 |
| Lotarn Limited | Manufacturing | 1988 |
| LR Food Safety Consultant Ltd | Hospitality | 2023 |
| Lucas Garage Company NW Ltd | Other services | 2017 |
| Lunalira.Com Ltd | Information & communication | 2025 |
| Lynx UK Trust Community Interest Company | Professional & scientific | 2015 |
| M & D Management Ltd | Hospitality | 2020 |
| M & G Graham Holdings Limited | Financial services | 2022 |
| M & G Graham Limited | Construction | 2011 |
| M G Independent Mortgages Limited | Financial services | 2017 |
| M James Construction Ltd | Construction | 2026 |
| M&J Williams Electrical Ltd | Other services | 2015 |
| M-Tech 360 Limited | Administrative & support | 2014 |
| M-Tech Europe Limited | Real estate | 2003 |
| Macbryde Homes Limited | Construction | 2020 |
| MAD Consulting Ltd | Information & communication | 2016 |
| Maelgwyn Ltd | Other services | 2020 |
| Maesmawr Farm Resort Limited | Hospitality | 2015 |
| Maesmawr Limited | Hospitality | 2017 |
| MAF Architectural Services Limited | Professional & scientific | 2016 |
| Magnolia Developments Limited | Construction | 2024 |
| Makeup and Lashes by Elliem Ltd | Other services | 2019 |
| Malcolm Drakeley Print Services Ltd | Professional & scientific | 2012 |
| Managing Maternity Limited | Professional & scientific | 2010 |
| Manchester Equestrian Ltd | Agriculture & fishing | 2026 |
| Mandarin Stasaph Ltd | Hospitality | 2025 |
| Manngo Design Ltd | Professional & scientific | 2011 |
| Manor Lane Garage Ltd | Manufacturing | 2015 |
| Manorafon Farm Park Ltd | Arts & recreation | 2021 |
| Manuel Tudor Ltd | Other services | 2018 |
| Marcus Andrews UK Ltd | Professional & scientific | 2019 |
| Marine and Renewable Energy Consultants (Marec) Ltd | Professional & scientific | 2015 |
| Mariva Care Ltd | Health & social care | 2016 |
| Mark Atherton Roofing Ltd | Construction | 2025 |
| Mark Salisbury Consulting Limited | Real estate | 2011 |
| Mars-Jones Properties Ltd | Real estate | 2022 |
| Marsh Planning & Design Ltd | Other services | 2014 |
| Marstane Accountancy Services Limited | Professional & scientific | 2009 |
| Marstep Resourcing Solutions Limited | Administrative & support | 2016 |
| Martin Brothers Developments Ltd | Construction | 2024 |
| Martin Brothers Plastering Limited | Construction | 2016 |
| Matthew Powell Hair Ltd | Other services | 2024 |
| MC Travel & Outdoor Activities Ltd | Other services | 2019 |
| Mccausland Developments Ltd | Construction | 2024 |
| MCS Rentals Limited | Administrative & support | 2016 |
| MCS Test Holdings Limited | Financial services | 2016 |
| MD Totally Trains Ltd | Other services | 2020 |
| Media Kitchin Ltd | Other services | 2018 |
| Medraf Digital Limited | Information & communication | 2026 |
| Meigh Ventures Limited | Administrative & support | 2016 |
| Merb Estates Limited | Real estate | 2021 |
| Mere Painting Services Limited | Professional & scientific | 2014 |
| Merton Villa Housing & Support Limited | Health & social care | 2023 |
| MG Developments (North Wales) Limited | Construction | 2012 |
| Mibar MB Ltd | Hospitality | 2025 |
| Michael Baxter Ltd | Administrative & support | 2023 |
| Mike Sargent & SON Limited | Construction | 2003 |
| Mike Smith Paving Ltd | Manufacturing | 2015 |
| Miss MIA Lashes (Sales) Limited | Wholesale & retail | 2019 |
| MJD City Lettings Ltd | Real estate | 2026 |
| MJH AIM Ltd | Professional & scientific | 2020 |
| MJS Care Limited | Health & social care | 2009 |
| MK Cubed Limited | Professional & scientific | 2019 |
| MLM Services NW Limited | Other services | 2019 |
| Mo-Ma's Pizza Ltd | Hospitality | 2026 |
| Modus International Ltd | Professional & scientific | 2021 |
| Moore Manor Estate Ltd | Real estate | 2024 |
| Morley Motors Ltd | Other services | 2014 |
| Morris Reynolds Properties Limited | Households | 2017 |
| Motex NW Ltd | Wholesale & retail | 2025 |
| Moveitwales Ltd | Transport & logistics | 2024 |
| MP Electrical NW Ltd | Construction | 2026 |
| MP Energy Group Ltd | Construction | 2026 |
| Mummy & Theo’S Little Baby Boutique Ltd | Wholesale & retail | 2019 |
| My Great Life C.I.C. | Real estate | 2013 |
| Myers LA Roche Limited | Professional & scientific | 2006 |
| Mymhp Ltd | Real estate | 2024 |
| Myzsa Group Ltd | Construction | 2024 |
| MÔN Medical Aesthetics Ltd | Other services | 2025 |
| N & J Scaffolding Limited | Construction | 2019 |
| N L C Joinery Ltd | Construction | 2026 |
| N P AIM Ltd | Professional & scientific | 2023 |
| N W Biomass Ltd | Construction | 2015 |
| N W Holiday Lettings Limited | Hospitality | 2018 |
| N&K Foxall Ltd | Financial services | 2026 |
| N. Cumberlidge (Jewellers) Ltd. | Wholesale & retail | 2002 |
| Naked Aesthetics NW Ltd | Other services | 2019 |
| Natalyashomestory Ltd | Wholesale & retail | 2020 |
| National Eco Investments Ltd | Construction | 2023 |
| Nautica Renewables Group Ltd | Professional & scientific | 2021 |
| Nbsw Limited | Administrative & support | 2016 |
| NC Vendor Management Limited | Administrative & support | 2014 |