| Lawson Civil Engineering & Utilities Limited | Construction | 2013 |
| Lazar Shading Limited | Construction | 2015 |
| Lazar Trading Limited | Wholesale & retail | 2026 |
| Leonardo's Delicatessen Limited | Wholesale & retail | 2003 |
| Lewis Construction & Civil Engineering Services Ltd | Construction | 2014 |
| Little Acorns Day Care Ltd | Education | 2020 |
| Llaeth Y Llan CYF | Manufacturing | 2004 |
| Llanberis Llewelyn Apartments Right to Manage Company Limited | Administrative & support | 2017 |
| Lloyd Fencing Ltd | Construction | 2021 |
| Llyn a Mynydd Ltd | Hospitality | 2026 |
| Lock Stock Developments Limited | Administrative & support | 2003 |
| Lyallpur Spice Ltd | Hospitality | 2024 |
| M and H Coaches Limited | Transport & logistics | 2012 |
| M Jones Homes Ltd | Real estate | 2020 |
| M K Holmberg Ltd | Administrative & support | 2018 |
| M Roberts Haulage Ltd | Transport & logistics | 2005 |
| M T H Preservations Limited | Construction | 2008 |
| MAD COW Agri Ltd. | Professional & scientific | 2018 |
| Mancfootball Ltd. | Arts & recreation | 2024 |
| Martin Leeds Electrical Services Ltd | Construction | 2010 |
| Marydei Trust | Health & social care | 2012 |
| Mayflower 666 Ltd | Hospitality | 2025 |
| Mcandrew Consultancy Ltd | Professional & scientific | 2022 |
| Mech North Wales Limited | Construction | 2026 |
| Mech Tech Automotive Ltd. | Wholesale & retail | 2014 |
| Medipure Limited | Other services | 2000 |
| Meirion Davies & Co. Limited | Wholesale & retail | 2004 |
| Melia Haulage & Farm Services Limited | Transport & logistics | 2022 |
| Mental Health Care (Heswall) Limited | Health & social care | 2014 |
| Mental Health Care (Hoylake) Limited | Health & social care | 2013 |
| Mental Health Care (Wirral) Limited | Health & social care | 2014 |
| Miffy Properties Limited | Real estate | 2020 |
| Mijas Mountain Limited | Transport & logistics | 2011 |
| Millennium Lands Ltd | Real estate | 2022 |
| Miss Beasley Tutoring Ltd | Education | 2016 |
| Moda Contracting Limited | Construction | 2015 |
| Moda Holdings UK Ltd | Financial services | 2024 |
| Moda Projects Limited | Construction | 2021 |
| Monk Holdings (NW) Limited | Financial services | 2025 |
| Morgeisions Mortgages Ltd | Financial services | 2024 |
| Morris Funeral Directors Limited | Other services | 2017 |
| Morris Granite & Marble Company Limited | Manufacturing | 1955 |
| Mott Consulting Limited | Professional & scientific | 2025 |
| MRH Consultancy Ltd | Hospitality | 2016 |
| Myddelton College Ltd | Education | 2014 |
| Mynydd Sleddog Adventures Ltd | Arts & recreation | 2019 |
| Namsey Ltd | Hospitality | 2020 |
| Nant Lladron Ltd | Hospitality | 2021 |
| NEL OWI Ltd | Other services | 2025 |
| Newlyn Developments Limited | Real estate | 2025 |
| Nexellence ERP & Business Solutions Ltd | Information & communication | 2021 |
| Nexus Hydration Services Ltd | Hospitality | 2017 |
| NHC Holdings Limited | Professional & scientific | 2003 |
| NHC Technology Limited | Manufacturing | 1981 |
| Niagara Healthcare Limited | Wholesale & retail | 1981 |
| Niagara Therapy (U.K.) Pension Trustees Limited | Administrative & support | 1978 |
| Niagara Therapy(U.K.)Limited | Wholesale & retail | 1965 |
| Nixon I.T. Ltd | Information & communication | 2023 |
| North Star Welding Ltd | Construction | 2009 |
| North Wales Crane Hire Limited | Administrative & support | 2025 |
| North Wales Production CYF | Information & communication | 2025 |
| North Wales Tidal Energy and Coastal Protection Co Limited | Administrative & support | 2013 |
| North West Facilities Ltd | Administrative & support | 2023 |
| Nrns Family Control LLP | | 2021 |
| Odessa Group Ltd | Transport & logistics | 2018 |
| Odessa Logistics Ltd | Transport & logistics | 2019 |
| Oel-Held (UK) Limited | Wholesale & retail | 1998 |
| OFF Road Engineering Limited | Manufacturing | 2011 |
| OFF Track Limited | Professional & scientific | 2022 |
| Offas Dyke Wines Ltd | Manufacturing | 2024 |
| Oftech Wind Ltd | Construction | 2013 |
| OGJ Utilities Ltd | Construction | 2025 |
| One Earth Education Ltd | Education | 2022 |
| Oolong Consulting Ltd | Professional & scientific | 2007 |
| Ovenden Family Control LLP | | 2024 |
| Owen & Edwards Ltd | Manufacturing | 2014 |
| P & a Cross Investments Ltd | Real estate | 2018 |
| P.C. Construction Holdings Ltd | Financial services | 2018 |
| Panel Diogelu Cydenwadol / Interdenominational Safeguarding Panel Ltd | Other services | 2009 |
| Pant Y Foel GIN Ltd | Manufacturing | 2018 |
| Paul Davies Contracting Ltd | Construction | 2016 |
| Paul Edwards Fitness Ltd | Administrative & support | 2016 |
| PCO Haulage Limited | Transport & logistics | 2014 |
| Peak Marquee Hire Limited | Administrative & support | 2016 |
| Pearson James Business Advisors Limited | Professional & scientific | 2022 |
| Peartree Estates Limited | Real estate | 2013 |
| Pellinore Property Ltd | Real estate | 2025 |
| PEN Y Bryn Group Limited | Financial services | 2026 |
| Pen-Y-Bryn Joinery Limited | Construction | 2000 |
| Pentrefelin Dairy Ltd | Wholesale & retail | 2020 |
| Phoenix Music & Giftware Ltd | Wholesale & retail | 2011 |
| Phoenix Transport Limited | Transport & logistics | 2005 |
| Pinnacle Safety Services Ltd | Professional & scientific | 2016 |
| Pjfh LLP | | 2022 |
| Plantech Services Ltd | Wholesale & retail | 2024 |
| Powell Consultancy Limited | Real estate | 1987 |
| Prassein Consulting Ltd | Information & communication | 2024 |
| Premier Heating UK Ltd | Manufacturing | 2008 |
| Progressive Dairy Farming Ltd | Agriculture & fishing | 2020 |
| Prophecy Retail Limited | Wholesale & retail | 2012 |