| Kestrel Supply Co. Limited | Professional & scientific | 1971 |
| KF Brickworks NW Ltd | Construction | 2020 |
| Kindred Movement Project CIC | Arts & recreation | 2023 |
| KJ Houses Ltd | Real estate | 2019 |
| Klass Electric Ltd | Construction | 2020 |
| KLC Media Ltd | Arts & recreation | 2025 |
| Knmcc Limited | Education | 2021 |
| KNW Services Limited | Administrative & support | 2021 |
| Krave Desserts Ltd | Hospitality | 2024 |
| Krish Vilal Ltd | Health & social care | 2013 |
| Krystal Aesthetics Ltd | Other services | 2020 |
| L&D Holdings Ltd | Construction | 2023 |
| Label Print Engineering Ltd | Manufacturing | 2018 |
| Lalli Logistics Ltd | Transport & logistics | 2025 |
| Landmark Driveways & Patios Ltd | Administrative & support | 2021 |
| Larch Services Limited | Administrative & support | 2025 |
| Larko VIP Services Ltd | Administrative & support | 2025 |
| Lawnguard Ltd. | Construction | 2009 |
| LDH Scaffolding Ltd | Construction | 2025 |
| LEP Holdings Ltd | Financial services | 2023 |
| Letpilot Ltd | Information & communication | 2025 |
| Life & Soul Veteran AID Ltd | Wholesale & retail | 2023 |
| Lion Property Ltd | Real estate | 2024 |
| Liquid Metal FX Ltd | Construction | 2020 |
| Little Giants Mall Management Company Limited | Households | 2008 |
| Little Rascals Prestatyn Ltd | Health & social care | 2026 |
| LJH Landscaping & Groundworks Ltd | Administrative & support | 2026 |
| LJR Trading Ltd | Professional & scientific | 2022 |
| LMC Fencing & Gates Ltd | Construction | 2026 |
| LRA Distributions Ltd | Wholesale & retail | 2026 |
| Luminova Sun Limited | Construction | 2026 |
| Lynwood Accountancy Services Limited | Professional & scientific | 2023 |
| M. G. Roofing (North Wales) Limited | Construction | 2019 |
| M.A.P Plastering Ltd | Construction | 2025 |
| M.B Wind Ltd | Professional & scientific | 2016 |
| Mack Maintenance Limited | Transport & logistics | 2015 |
| MAG Healthcare Ltd | Health & social care | 2022 |
| Magpie Wind Ltd | Professional & scientific | 2024 |
| Maher Customs Ltd | Wholesale & retail | 2021 |
| Maher Property Development Ltd | Construction | 2026 |
| Mahlemut Ltd | Wholesale & retail | 2024 |
| Manchester Roofing & Guttering Ltd | Construction | 2024 |
| Mari Lwyd CYF | Education | 2023 |
| Mark Instance Limited | Manufacturing | 2017 |
| Mark James Enterprise Ltd | Real estate | 2026 |
| Mark Perry Vehicle and Plant Repairs Ltd | Wholesale & retail | 2022 |
| Maya Archaeologist Ltd | Professional & scientific | 2022 |
| Medipinion Ltd | Health & social care | 2023 |
| Meliden Football Club C.I.C. | Arts & recreation | 2023 |
| Merlin Marine Ltd | Transport & logistics | 2025 |
| Mersey Technology Ltd | Administrative & support | 2018 |
| Mevel Ltd | Information & communication | 2015 |
| MGS Quality Car Repairs Limited | Wholesale & retail | 2011 |
| MGW Leisure Ltd | Hospitality | 2025 |
| MHZ Corporation Limited | Wholesale & retail | 2026 |
| MIA Horne Ltd | Financial services | 2023 |
| Milos Farmers Market Cafe Limited | Hospitality | 2026 |
| Mimi Toko Limited | Real estate | 1997 |
| Minnie George Lettings Ltd | Hospitality | 2025 |
| MJB Logistics Ltd | Transport & logistics | 2025 |
| MJE (North Wales) Limited | Wholesale & retail | 2014 |
| ML Electrick Ltd | Construction | 2018 |
| Money Mental UK Ltd | Wholesale & retail | 2021 |
| Morethanabench Ltd | Manufacturing | 2025 |
| Morgan Brennan Hair Ltd | Other services | 2024 |
| Morgans Hair Loss Solutions Ltd | Other services | 2023 |
| Morgans Wigs Ltd | Other services | 2014 |
| Morris Financial Management Ltd | Financial services | 2014 |
| MRC & Sons Vehicle Sales Ltd | Wholesale & retail | 2022 |
| Mrc&Sons Property Ltd | Real estate | 2023 |
| MRT Decorators Limited | Construction | 2005 |
| MRW Composites Ltd | Construction | 2024 |
| Munch Prestatyn Limited | Hospitality | 2024 |
| MW Property Sourcing Ltd | Administrative & support | 2023 |
| My Dailys Health Ltd | Wholesale & retail | 2025 |
| Natural Decor Limited | Construction | 2008 |
| Nelsons Micro Care CIC | Health & social care | 2023 |
| New Pizza PAN Limited | Hospitality | 2016 |
| New Style Driveways and Patios Limited | Construction | 2012 |
| Newlyn Housing Limited | Hospitality | 2013 |
| Nextgenliving Ltd | Real estate | 2023 |
| Nexus Recycling Ltd | Wholesale & retail | 2025 |
| NH. Rose Transport Ltd | Transport & logistics | 2020 |
| Nick Evans Electrical Ltd | Construction | 2021 |
| Noble Install Group Limited | Wholesale & retail | 2026 |
| Noddfa Games Club Limited | Health & social care | 2025 |
| North Wales Alarms Ltd | Construction | 2003 |
| North Wales Brickwork Ltd | Construction | 2024 |
| North Wales Metal Finishing Ltd | Manufacturing | 2023 |
| North Wales Property Tax Consultants Ltd | Professional & scientific | 2023 |
| North Wales Spray Services Ltd | Construction | 2021 |
| North Wales Venture Capital Limited | Financial services | 2004 |
| Northline Roofing & Building Ltd | Construction | 2025 |
| Northwest Services (UK) Ltd | Other services | 2013 |
| Nova Brickwork Developments Ltd | Construction | 2024 |
| NP Shannon Property Group Ltd | Real estate | 2025 |
| NW Groundworks Limited | Construction | 2026 |
| NW Steel Solutions Ltd | Construction | 2026 |
| Nwfa Group Limited | Arts & recreation | 2025 |
| NXT LVL Gym Limited | Arts & recreation | 2025 |