| Lynn Worrall Ltd | Extraterritorial | 2023 |
| Lynsay Gould HR Services Limited | Administrative & support | 2015 |
| Lynwen Maxwell Consulting Limited | Information & communication | 2017 |
| Lyons Engineering Limited | Administrative & support | 2014 |
| Lyons Removals and Storage Company Ltd | Transport & logistics | 2026 |
| Lyster Development Corporation Limited | Real estate | 2019 |
| Lyte Bytes Limited | Information & communication | 2021 |
| LZ Howard Engineering Limited | Administrative & support | 2011 |
| LZK Consultancy Limited | Administrative & support | 2016 |
| M & a Murray (Joinery) Limited | Manufacturing | 1992 |
| M & C Developments Limited | Real estate | 2004 |
| M & C Event Catering Limited | Hospitality | 2026 |
| M & C Plumbing & Heating Ltd | Professional & scientific | 2023 |
| M & G Fidler Ltd | Administrative & support | 2018 |
| M & G Murray Properties Ltd | Real estate | 2016 |
| M & J Design Solutions Limited | Administrative & support | 2011 |
| M & J Supplies (UK) Ltd | Wholesale & retail | 2007 |
| M & L Properties Limited | Real estate | 1996 |
| M & M Commercial Solutions Limited | Professional & scientific | 2012 |
| M & M Garden Services Limited | Other services | 2016 |
| M & N Accountancy Services Limited | Professional & scientific | 2021 |
| M & S Properties (Warrington) Ltd | Real estate | 2022 |
| M & W Holdings U.K. Limited | Professional & scientific | 2008 |
| M a Financial Services Ltd | Financial services | 2020 |
| M a L Pumps Limited | Professional & scientific | 2001 |
| M B Windowclean.Com Limited | Administrative & support | 2020 |
| M Bear Ltd | Manufacturing | 2020 |
| M Bell Engineering Services Limited | Administrative & support | 2024 |
| M C Interiors and Office Refurbishments Ltd | Construction | 2012 |
| M C Perry Limited | Administrative & support | 2011 |
| M Cayton Construction Ltd | Administrative & support | 2023 |
| M D Hutton Group Ltd | Financial services | 2026 |
| M D Hutton Joinery Limited | Other services | 2003 |
| M Davidson Limited | Administrative & support | 2011 |
| M Emmess Limited | Administrative & support | 2022 |
| M G Kimani Ltd | Construction | 2017 |
| M Group NW Limited | Construction | 2023 |
| M H Electrical Installation Limited | Construction | 2014 |
| M Hafid Engineering Ltd | Professional & scientific | 2017 |
| M I Travel Limited | Transport & logistics | 2018 |
| M Ibrahim Perfumes Trading UK Limited | Manufacturing | 2026 |
| M J Fiddes Solutions Ltd | Administrative & support | 2023 |
| M J Hickman Limited | Construction | 2024 |
| M J Hickman Property Limited | Real estate | 2025 |
| M J Maintenance Ltd | Construction | 2016 |
| M J P Engineering Services Limited | Professional & scientific | 2015 |
| M J Roylance Limited | Professional & scientific | 2025 |
| M Keig IT Limited | Administrative & support | 2011 |
| M L Engineering (NW) Limited | Information & communication | 2008 |
| M Littlewood Limited | Construction | 2010 |
| M M Hunter Limited | Arts & recreation | 2025 |
| M Mackay Consulting Limited | Professional & scientific | 2024 |
| M Oils Limited | Wholesale & retail | 1998 |
| M Pavey Tutoring Limited | Education | 2025 |
| M Residential North West Limited | Real estate | 2025 |
| M ROD Consulting Limited | Administrative & support | 2021 |
| M Rogers Holdings Limited | Administrative & support | 2016 |
| M S Decorating Contractors Ltd | Construction | 2014 |
| M S Electrical Services Cheshire Ltd | Construction | 2025 |
| M Shaw Credit Management Limited | Professional & scientific | 2018 |
| M Stacey Engineering Limited | Administrative & support | 2014 |
| M Stewart Project Management Ltd | Professional & scientific | 2019 |
| M Sweeney Design Ltd | Administrative & support | 2014 |
| M Vincent Geological Services Ltd | Administrative & support | 2016 |
| M Wallwork Consulting Limited | Information & communication | 2008 |
| M&A Cliffe Limited | Construction | 2024 |
| M&A Rendering Supplies Limited | Wholesale & retail | 2022 |
| M&Bh Properties Ltd | Real estate | 2016 |
| M&C Catering Limited | Hospitality | 2021 |
| M&C Dawson Ltd. | Real estate | 2021 |
| M&D Platt Ltd | Real estate | 2021 |
| M&D Recovery Limited | Professional & scientific | 2009 |
| M&E Business Group Holdings Ltd | Financial services | 2025 |
| M&E Business Solutions Limited | Professional & scientific | 2023 |
| M&E Capital Investments Ltd | Real estate | 2024 |
| M&E Dynamics Limited | Energy | 2019 |
| M&E Stayhub Living Ltd | Real estate | 2025 |
| M&J NOY Limited | Financial services | 2022 |
| M&M Design UN Limited | Wholesale & retail | 2022 |
| M&Q Properties Limited | Real estate | 2019 |
| M&R Accommodations Ltd | Hospitality | 2024 |
| M&S Commercial Services Limited | Construction | 2018 |
| M&S Food Supplies Ltd | Hospitality | 2019 |
| M&S Security Limited | Administrative & support | 2024 |
| M-Daq Europe Limited | Financial services | 2022 |
| M-Power Housing Limited | Real estate | 2008 |
| M. & W. (Woolston) Electrics Limited | Construction | 1973 |
| M. a. Aziz and Partners Ltd | Health & social care | 2016 |
| M.C.S Plastering Services Limited | Construction | 2015 |
| M.D. Hotel Interiors Limited | Manufacturing | 1984 |
| M.D. Properties (Northern) Limited | Real estate | 2003 |
| M.G. Judd Limited | Wholesale & retail | 2001 |
| M.H Hanson Properties Limited | Real estate | 2026 |
| M.Helassa Ltd | Professional & scientific | 2022 |
| M.Hyam Projects Ltd | Professional & scientific | 2019 |
| M.I.B Training Solutions Ltd | Professional & scientific | 2025 |
| M.J Mcarthur Engineering Limited | Administrative & support | 2013 |
| M.J.M. Plumbing & Heating Limited | Construction | 1997 |
| M.Jakabfy Energy Consulting Ltd | Administrative & support | 2026 |
| M.L.B Consultancy Limited | Administrative & support | 2024 |