| LEE Laus Limited | Hospitality | 2019 |
| Lees Garden Limited | Hospitality | 2018 |
| Lehart Productions Limited | Information & communication | 2024 |
| Leigh's Property Services Ltd | Construction | 2021 |
| Leilabells Ltd | Wholesale & retail | 2026 |
| Let's Play 2024 Ltd | Education | 2021 |
| Let's Play Management Ltd | Health & social care | 2023 |
| Lewburgess Ltd | Wholesale & retail | 2024 |
| Lewis Cabling Solutions Ltd | Construction | 2018 |
| Lewis Property Care Ltd | Construction | 2018 |
| LEX Bros Building & Brickwork Ltd | Construction | 2018 |
| Liffys Cafe Ltd | Hospitality | 2026 |
| Likkle Acorn Ltd | Wholesale & retail | 2021 |
| Limelight Developments Limited | Construction | 2011 |
| Line Managment Ltd | Wholesale & retail | 2025 |
| Linkstech Limited | Other services | 2018 |
| LL Estates Ltd | Real estate | 2012 |
| LL Recruitment CYF | Administrative & support | 2026 |
| LL19 Barbers Limited | Other services | 2016 |
| Llanberis Takeaway Limited | Hospitality | 2025 |
| Llandudno Smiles Limited | Health & social care | 2015 |
| Lloyd Property Ltd | Real estate | 2024 |
| LMI Logistitcs Ltd | Transport & logistics | 2025 |
| Loamy Ltd | Hospitality | 2026 |
| Lola's Business Support Ltd | Administrative & support | 2025 |
| London Lilies Fashion Ltd | Wholesale & retail | 2018 |
| Longacres Filling Station Ltd | Wholesale & retail | 2007 |
| Longtii Ltd | Wholesale & retail | 2025 |
| Lottie's Lodge Ltd | Wholesale & retail | 2023 |
| Loving Arms Domiciliary Care Ltd | Administrative & support | 2025 |
| LSR Accountancy Ltd | Professional & scientific | 2024 |
| Lucky House 2021 Limited | Hospitality | 2021 |
| Lucky House 2024 Limited | Hospitality | 2024 |
| Luckys Desserts Ltd | Hospitality | 2025 |
| Lucy Davies Ltd | Transport & logistics | 2025 |
| Lumina Solar Energy Solutions Limited | Energy | 2025 |
| Luxury Lodge Stays Ltd | Other services | 2021 |
| Luxury Perfume Ltd | Wholesale & retail | 2025 |
| LVL UP Scaffolding Limited | Construction | 2024 |
| M D Brown & SON Ltd | Construction | 2018 |
| M O 2026 Ltd | Hospitality | 2026 |
| M.D.W Carpentry and Joinery Ltd | Construction | 2021 |
| Mabella Properties Ltd | Real estate | 2026 |
| MAC 92 Solutions Ltd | Administrative & support | 2025 |
| Mag's Cosy Cafe Ltd | Hospitality | 2025 |
| Makerspace Rhyl Ltd | Wholesale & retail | 2026 |
| Mali at Langleys Limited | Other services | 2007 |
| Malvern Investment Group Ltd | Real estate | 2026 |
| Manhall Knight RTM Company Ltd | Households | 2025 |
| Manor Guest House Ltd | Other services | 2022 |
| Marford Estates Limited | Construction | 2016 |
| Mariam’S Kitchen Limited | Hospitality | 2026 |
| Mario Land Ltd | Wholesale & retail | 2018 |
| Marl Developments Ltd | Real estate | 2026 |
| Marsh Road Childrens Centre Ltd. | Education | 2010 |
| Marsh-Evans Caravan Repairs Limited | Manufacturing | 2018 |
| Massey Signalling Ltd | Construction | 2022 |
| Mathematical Systems Ltd | Information & communication | 2015 |
| Maxwell & Co Power CYF | Administrative & support | 2025 |
| Mbhv Ltd | Energy | 2025 |
| Mcguinness Electrical Ltd | Construction | 2017 |
| Mcguinness Property Solutions Ltd | Real estate | 2024 |
| ME & HIM Removals & Storage (North Wales) Ltd | Transport & logistics | 2012 |
| Mechanic Garage & Tyres Ltd | Wholesale & retail | 2026 |
| Megashedz Buildings Limited | Construction | 2011 |
| Meigh Premier Parking Ltd | Transport & logistics | 2024 |
| Menai Bridge Limited | Hospitality | 2014 |
| Mertch Ltd | Real estate | 2024 |
| MGL Design Group UK Ltd | Information & communication | 2024 |
| MGV Corp Ltd | Construction | 2016 |
| MH Lettings Management Limited | Real estate | 2025 |
| Millahz Autoz Ltd | Extraterritorial | 2025 |
| Millard & Welsman Homes Ltd | Hospitality | 2018 |
| Millbank Inn Ltd | Hospitality | 2021 |
| Mindfight C.I.C. | Health & social care | 2026 |
| Ming Sing Limited | Hospitality | 2016 |
| Ming Sing Takeaway Limited | Hospitality | 2025 |
| Minimalistic Menswear Limited | Wholesale & retail | 2025 |
| Miszmags Ltd | Manufacturing | 2026 |
| MJ Power Hire Services Ltd | Construction | 2019 |
| Mjtk Lettings Limited | Real estate | 2019 |
| Mjtk Properties Limited | Real estate | 2018 |
| Mobile Homes Installation Specialist Ltd | Construction | 2018 |
| Mojo Hair Studio Limited | Administrative & support | 2017 |
| Monolith Brick and Stone Limited | Manufacturing | 2015 |
| Moorside Farm LLP | | 2010 |
| Morris Funeral Services Ltd | Other services | 2025 |
| Mosaic IT Solutions Limited | Information & communication | 2009 |
| Moshtip Ltd | Arts & recreation | 2024 |
| Motoclark Ltd | Wholesale & retail | 2020 |
| Mouldtec Products Limited | Manufacturing | 2006 |
| Move 24/7 North Wales Ltd | Households | 2024 |
| MR a France Ltd | Energy | 2022 |
| MR Jones Welding Limited | Manufacturing | 2015 |
| MR Williams Ltd | Professional & scientific | 2021 |
| MRP Auto Ltd | Extraterritorial | 2021 |
| MTH Electrical Contractors Limited | Energy | 2004 |
| Mulberry Stores Ltd | Wholesale & retail | 2023 |
| Multi Maintenance Services (UK) Limited | Construction | 2011 |
| Multi Rail Ltd | Construction | 2018 |