| Kodinko Limited | Information & communication | 2017 |
| Korahi Kitchen Bangladeshi Takeaway Ltd | Hospitality | 2026 |
| KSV Supplies Ltd | Wholesale & retail | 2022 |
| KT Intelligence CIC | Information & communication | 2010 |
| KVC Consulting Limited | Professional & scientific | 2022 |
| KWI (UK) Limited | Manufacturing | 1959 |
| Kyabje Chime Rinpoche International Archive | Arts & recreation | 2021 |
| L Kitchiner BC Ltd | Professional & scientific | 2015 |
| L&Lsales Ltd | Wholesale & retail | 2025 |
| L&S Property Holdings Ltd | Real estate | 2006 |
| Ladybird Vapours Ltd | Wholesale & retail | 2015 |
| LAJ Business Consulting Ltd | Professional & scientific | 2023 |
| Lancashire Plant & Tool Hire Limited | Administrative & support | 1972 |
| Lancaster Carving Limited | Arts & recreation | 2019 |
| Land Trade Partners Limited | Real estate | 2023 |
| Landmark Rentals Ltd | Real estate | 2019 |
| Lang Developments Limited | Real estate | 2017 |
| Lanna Thai Limited | Hospitality | 2025 |
| Lanofilm Limited | Professional & scientific | 1955 |
| Late Apex Racing Ltd | Wholesale & retail | 2026 |
| Lawler Homes Ltd | Real estate | 2020 |
| Lbb&Co Ltd | Wholesale & retail | 2020 |
| LCS Property Management Ltd | Real estate | 2012 |
| Learn With Leon Driving School Ltd | Education | 2026 |
| Leenproperty Ltd | Real estate | 2020 |
| Leeswood Community Centre Trading Limited | Arts & recreation | 2017 |
| Leete Valley Caravan Park Ltd | Hospitality | 2025 |
| Legacy Change Limited | Wholesale & retail | 2019 |
| Legacy Communications Limited | Information & communication | 2013 |
| Legendary Pulls Ltd | Wholesale & retail | 2026 |
| Lets Book Florida Ltd | Administrative & support | 2024 |
| Lewis Hallam Limited | Information & communication | 2005 |
| Lewis Makes Ltd | Information & communication | 2025 |
| LGP Machinery Services Ltd | Manufacturing | 2023 |
| LHM Automotive Limited | Wholesale & retail | 2013 |
| Liberty Care (Flintshire) Limited | Health & social care | 2012 |
| Limitless Roofing & Building Ltd | Construction | 2025 |
| Lincoln Munro Properties Limited | Real estate | 2017 |
| Linear Engineering Services Ltd | Professional & scientific | 2007 |
| Link Legal Limited | Professional & scientific | 2018 |
| LJC Renewables Ltd | Construction | 2025 |
| LJC3 Ltd | Real estate | 2024 |
| LJM Construction Limited | Construction | 2017 |
| Ljny Ltd | Transport & logistics | 2019 |
| LJP Cabinetry Ltd | Manufacturing | 2021 |
| Llewellyn-Jones Limited | Professional & scientific | 2010 |
| Lloyd and Sons Haulage Ltd | Transport & logistics | 2020 |
| Lloyd Jones Contractors Limited | Construction | 2019 |
| Lloyd Motors NW Ltd | Wholesale & retail | 2024 |
| Lloyd's Spar Quarries (Mold) Limited | Wholesale & retail | 1939 |
| Llys Fammau Residents Association Limited | Professional & scientific | 1980 |
| LMP Agricultural Limited | Arts & recreation | 2023 |
| Loading Bay Safety Solutions Ltd | Manufacturing | 2026 |
| Loadlines Consultants Ltd. | Transport & logistics | 2015 |
| Logistics (Events) Limited | Arts & recreation | 2019 |
| Longhouse Business Services Ltd | Professional & scientific | 2003 |
| LOS Pelicanos LLP | | 2009 |
| Louis R Davies Barbering Co Ltd | Other services | 2025 |
| LRS Media Ltd | Professional & scientific | 2021 |
| LSR Landscapes Ltd | Administrative & support | 2025 |
| Lucien Limited | Wholesale & retail | 2025 |
| Lucy Palmer's Pilates Limited | Health & social care | 2016 |
| Lughnasadh Ltd | Information & communication | 2018 |
| Lulu Holdings Northwest Limited | Financial services | 2025 |
| Lush Hair Studio (Mold) Limited | Other services | 2017 |
| M & C Buxton Ltd | Construction | 2020 |
| M L Electrical Solutions Limited | Construction | 2014 |
| M&D Media Ltd | Information & communication | 2015 |
| M-Event Production Ltd | Arts & recreation | 2019 |
| M.J.G Groundworks and Drainage Consultants Ltd | Construction | 2014 |
| M.P.H. (North Wales) Limited | Construction | 1982 |
| Mackay Estates Ltd | Construction | 2025 |
| Madelocal Limited | Wholesale & retail | 2021 |
| Magical Breaks Ltd | Administrative & support | 2004 |
| Magickal Manfa Limited | Health & social care | 2025 |
| Mahalakshmi E - Commerce Limited | Wholesale & retail | 2025 |
| Maidperfectuk Ltd | Administrative & support | 2018 |
| Make a Difference Media and Events Limited | Information & communication | 2025 |
| Malk Homes Limited | Construction | 2005 |
| Mama Commune Ltd | Arts & recreation | 2019 |
| MAR Structural Glass Consultancy Limited | Construction | 2017 |
| Mari Edwards Marketing Ltd | Professional & scientific | 2025 |
| Marinendt Ltd | Professional & scientific | 2024 |
| Mark Hughes Property Development Limited | Real estate | 2003 |
| Mark Roberts Associates Ltd | Professional & scientific | 2016 |
| Marless Ltd | Construction | 2010 |
| Marshall D Limited | Wholesale & retail | 2024 |
| Martin Davies Limited | Wholesale & retail | 2007 |
| Martin Jones Steel Fabrication Limited | Manufacturing | 2015 |
| Mashfm Ltd | Real estate | 2026 |
| Matthews & Sons Taverns Ltd | Hospitality | 2024 |
| Maxoutuk Ltd | Arts & recreation | 2022 |
| MAZ Civils Limited | Construction | 2018 |
| Mcdonald Painting Contractors Ltd. | Construction | 2016 |
| Mcnally Property Investments Ltd. | Real estate | 2017 |
| Mcnallys Brewery Ltd | Manufacturing | 2023 |
| Mcvm Holdings Limited | Financial services | 2017 |
| MDR Online Ltd | Wholesale & retail | 2023 |
| Meadow Training Ltd | Education | 2021 |
| Mega Electrical NW Ltd | Construction | 2012 |