| LIZ Rowlands Coaching Ltd | Administrative & support | 2023 |
| LJB Furniture Ltd | Wholesale & retail | 2025 |
| LJD Innovation Ltd | Professional & scientific | 2018 |
| LLA Legal Limited | Professional & scientific | 2020 |
| Llan Afterschool Club Limited | Health & social care | 2020 |
| Llanberis Property Limited | Real estate | 2008 |
| Llangollen Sports Club Ltd | Health & social care | 2016 |
| Llangollen Standard 4 Trust | Professional & scientific | 1996 |
| Llay Food Ltd | Hospitality | 2016 |
| Llay Miners Welfare Institute Limited | Information & communication | 1996 |
| LLC (Cheshire) Ltd | Other services | 2023 |
| LLC Building Contractors Limited | Construction | 2022 |
| Llewellyn Healthcare Ltd | Health & social care | 2026 |
| Llewellyn Ridge Limited | Real estate | 2007 |
| Llewelyn Estates Limited | Real estate | 2024 |
| Llewelyn Healthcare Group Limited | Health & social care | 2018 |
| Llif Limited | Professional & scientific | 2013 |
| LLJ Contracting Limited | Professional & scientific | 2012 |
| Lloyd Morris Electrical Limited | Construction | 1974 |
| Lloyds (Newtown) Limited | Wholesale & retail | 2004 |
| Llwyneinion Woodland and Village Green Community Interest Company | Other services | 2023 |
| Llys Y Dderwen Management Company Limited | Households | 1997 |
| LM Executive Travel Ltd | Transport & logistics | 2025 |
| LMJ Law Limited | Professional & scientific | 2023 |
| LMS Automotive Ltd | Wholesale & retail | 2016 |
| Localink Logistics Ltd | Transport & logistics | 2021 |
| Lodge Farm Biogas Limited | Water & waste | 2011 |
| Logger Clobber Limited | Wholesale & retail | 2014 |
| Logodigitizing Ltd | Professional & scientific | 2022 |
| Lojikal Limited | Manufacturing | 2012 |
| Loki Construction Consultants Ltd | Construction | 2023 |
| LOM Brothers & SON Ltd | Real estate | 2025 |
| Lomani Luxury Travel Limited | Administrative & support | 2012 |
| Lomani Travel Limited | Administrative & support | 2012 |
| Longmans Butchers Limited | Wholesale & retail | 2014 |
| Lord Street Limited | Real estate | 2012 |
| Lorenzo Developments Ltd | Construction | 2015 |
| LOT 3 Ltd | Health & social care | 2023 |
| LOT9 Auction House Limited | Real estate | 2020 |
| Louise Clancy Pilates Limited | Health & social care | 2016 |
| Louise Fisher Ltd | Administrative & support | 2018 |
| Love Wrexham Magazine Ltd | Information & communication | 2019 |
| Lovecyproperties Ltd | Real estate | 2025 |
| Lowe Management Services Limited | Professional & scientific | 2025 |
| Lowe Material Handling Limited | Manufacturing | 2025 |
| Lowe Special Products Limited | Manufacturing | 2011 |
| Lowe UK Incorporated Limited | Financial services | 2025 |
| Lower Oak Ltd | Administrative & support | 2006 |
| LPF Energy Limited | Energy | 2022 |
| LPM Solutions Group Ltd | Information & communication | 2026 |
| LPW Painters & Decorators Ltd | Construction | 2022 |
| LRS Site Services Limited | Construction | 2015 |
| LSC Developments Ltd | Construction | 2016 |
| LT Bookkeeping Ltd | Professional & scientific | 2023 |
| Lucid Natura Limited | Wholesale & retail | 2025 |
| Lucidpay Holdings Co Ltd | Financial services | 2025 |
| Lucidpay Limited | Financial services | 2024 |
| Lucky House TA Ltd | Hospitality | 2026 |
| Lucy Hunter Ltd | Administrative & support | 2013 |
| Ludford Farm Limited | Agriculture & fishing | 2025 |
| Ludvale Property Management Limited | Households | 2006 |
| Lukas Transport Specialists Ltd | Transport & logistics | 2017 |
| Luke R Electrical Solutions Ltd | Construction | 2023 |
| Lumibright Limited | Wholesale & retail | 2017 |
| Lumique-Store Limited | Wholesale & retail | 2025 |
| Luna & Co Events Limited | Arts & recreation | 2025 |
| Luna Beauty and Skin Limited | Other services | 2022 |
| Lura Properties Ltd | Real estate | 2026 |
| Luther Burrell Holdings Ltd | Financial services | 2025 |
| Luxas Properties Ltd | Real estate | 2025 |
| Luxchip Systems Limited | Other services | 2025 |
| Lwcus TOO Ltd | Extraterritorial | 2001 |
| LWE Plumbing & Heating Limited | Construction | 2024 |
| Lyan Packaging Supplies T/A Icertech Limited | Manufacturing | 1988 |
| Lyndon J Ellams Limited | Construction | 2011 |
| Lynno Trading Limited | Administrative & support | 2023 |
| Lynx Elite Logistics Ltd | Transport & logistics | 2026 |
| Lyons Platinum Group Ltd | Financial services | 2025 |
| Lyra Drinks Ltd | Manufacturing | 2025 |
| M & B Haulage Limited | Other services | 1981 |
| M & D Engineering Services Limited | Construction | 2025 |
| M & I Vehicle Hire Limited | Administrative & support | 2014 |
| M & J Lewis Property Services Limited | Extraterritorial | 2014 |
| M & J Services (J.B.) Limited | Construction | 2002 |
| M & K Holdings 1975 Ltd | Real estate | 2025 |
| M & L Investment Partners LLP | | 2009 |
| M & M Jones Developments Limited | Real estate | 2014 |
| M & P Plastering Contractors Limited | Construction | 2017 |
| M Burgess ADI Ltd | Education | 2014 |
| M D Coxey & Co Limited | Professional & scientific | 1988 |
| M D Coxey Holdings Limited | Extraterritorial | 2015 |
| M D Land Limited | Administrative & support | 2008 |
| M E Evans Ltd | Wholesale & retail | 2003 |
| M F Flute Construction Limited | Construction | 2014 |
| M G Walker Haulage Limited | Transport & logistics | 2022 |
| M Gibson & Sons Limited | Construction | 2013 |
| M Jawad Hassan Ltd | Wholesale & retail | 2026 |
| M L Commercial Services Limited | Wholesale & retail | 2019 |
| M T K Fast Food Ltd | Hospitality | 2017 |
| M&A Access Limited | Construction | 2020 |