| Lockhard International Limited | Wholesale & retail | 2021 |
| London’S Design Ltd | Professional & scientific | 2026 |
| Longboat RUM Limited | Wholesale & retail | 2024 |
| Lord Durham Care Homes Limited | Health & social care | 2013 |
| Lordsandladiesclub Ltd | Hospitality | 2023 |
| LOW Borrowbridge Farm Limited | Agriculture & fishing | 2019 |
| Ltjma Limited | Information & communication | 2026 |
| Lucasa Property Rentals Ltd. | Real estate | 2020 |
| Luvix Holdings Ltd | Financial services | 2026 |
| Luxe Brickwork Limited | Construction | 2020 |
| Luxe Building and Construction Ltd | Construction | 2024 |
| Luxecleaningco Ltd | Administrative & support | 2025 |
| Luxor Advertising Group Ltd. | Information & communication | 2018 |
| LV Pixel Stories Ltd | Professional & scientific | 2025 |
| Lyons Properties Limited | Professional & scientific | 2009 |
| M & KB Construction Limited | Construction | 2017 |
| M & KB Installations Limited | Construction | 2009 |
| M a Colgan Financial Adviser Ltd | Administrative & support | 2010 |
| M Assets Limited | Professional & scientific | 2018 |
| M F Garden Maintenance Ltd | Other services | 2016 |
| M Hargreaves Management Ltd | Professional & scientific | 2018 |
| M J Teale Plant Hire Limited | Water & waste | 2003 |
| M&J Shaw Properties Ltd | Real estate | 2023 |
| M&M Technology Ltd | Administrative & support | 2023 |
| M&W Landscapes Northwest Ltd | Administrative & support | 2020 |
| M.C.S.Ambler Limited | Energy | 2022 |
| MAC Wheels Ltd | Wholesale & retail | 2023 |
| Magma Estates Ltd | Real estate | 2019 |
| Mainstream Water Services Ltd | Water & waste | 2018 |
| Maml Exports Limited | Wholesale & retail | 2019 |
| Mansmore Developments Limited | Professional & scientific | 1958 |
| MAP Optics Ltd | Wholesale & retail | 2022 |
| Marbeq Limited | Real estate | 2015 |
| Marble Beers Limited | Manufacturing | 1995 |
| Market Roots Ltd | Professional & scientific | 2022 |
| Markham Mortgages & Financial Planning Ltd | Financial services | 2023 |
| Marmalade Kidz Limited | Health & social care | 2019 |
| Marsland House Limited | Real estate | 2015 |
| Martin Powell Installations Limited | Construction | 2018 |
| Masala Fries Special Ltd | Manufacturing | 2026 |
| Masonic Hall (Cleveleys) Limited | Hospitality | 1907 |
| Maxigiene Environmental Services Ltd | Construction | 2004 |
| Maximeyez Ltd | Wholesale & retail | 2018 |
| Mayson Creighton Holdings Group Ltd | Financial services | 2025 |
| MC Composites Ltd | Wholesale & retail | 2024 |
| Mcconnachie Technical Services (MTS) Ltd | Administrative & support | 2024 |
| Mccormack Haulage Ltd | Transport & logistics | 2025 |
| MD Maintenance and Property Ltd | Real estate | 2025 |
| MDB Property Company Limited | Real estate | 2011 |
| Meadow Property Investments Limited | Real estate | 2016 |
| Meatsupply Limited | Wholesale & retail | 2019 |
| Mechanical and Fluid Services Limited | Construction | 2009 |
| Mechanical Services (NW) Ltd | Manufacturing | 1997 |
| Medtech Search Associates Limited | Administrative & support | 2013 |
| Mellon Games Ltd | Manufacturing | 2024 |
| Melrose Development Services Limited | Administrative & support | 2015 |
| Melrose Homes Limited | Real estate | 2004 |
| Melrose Investments Holdings Limited | Real estate | 2017 |
| Melrose Investments Limited | Real estate | 1998 |
| Melrose Land Limited | Construction | 2005 |
| Mercury Property Enterprises Limited | Real estate | 2022 |
| Mercury Property Innovation Ltd | Real estate | 2022 |
| Metcalfe Morley Properties Limited | Real estate | 2016 |
| MG Atex Access Ltd | Wholesale & retail | 2026 |
| Microlite Software Ltd | Information & communication | 2012 |
| Millami Limited | Wholesale & retail | 2026 |
| Milldown Property Management Services Limited | Real estate | 2015 |
| Millennial Opulence Ltd | Real estate | 2022 |
| Mills Property Investment Limited | Real estate | 2018 |
| Mister Jack Plumbing & Heating Limited | Construction | 2018 |
| Mitch Smith Events Ltd | Professional & scientific | 2023 |
| Mizzicats Consultancy Limited | Professional & scientific | 2020 |
| Mizzicats Services Limited | Professional & scientific | 2024 |
| Mjames VB Limited | Transport & logistics | 2025 |
| MJB Decking Limited | Construction | 2017 |
| MJV & Co Solicitors Ltd | Professional & scientific | 2016 |
| MKW Logistics Ltd | Transport & logistics | 2025 |
| MNM Properties (NW) Ltd | Real estate | 2025 |
| Mobile CAD Surveying Ltd | Extraterritorial | 2008 |
| Mobility 2000 Limited | Wholesale & retail | 2006 |
| Mobility Appliances Limited | Manufacturing | 1991 |
| Moccasin Jazz Limited | Hospitality | 2021 |
| Modestobuyabodes Ltd | Real estate | 2020 |
| Moor Park Court (Blackpool) Limited | Households | 1977 |
| Morley D Limited | Wholesale & retail | 2013 |
| Morningstar Property Ltd | Construction | 2020 |
| Moss Development Group Ltd | Real estate | 2020 |
| Mountain PAW Ltd | Other services | 2022 |
| Mowru Ltd | Real estate | 2016 |
| MRF Supply Chain Limited | Professional & scientific | 2021 |
| MRT Property Services Ltd | Construction | 2026 |
| Munnerley & SON Limited | Transport & logistics | 2024 |
| Murugan Property Limited | Real estate | 2012 |
| MWH Joinery Limited | Construction | 2003 |
| MWS Developments Limited | Real estate | 2023 |
| MWS Properties Limited | Real estate | 2012 |
| My Law Forms Limited | Professional & scientific | 2007 |
| My Rara Panda Ltd | Wholesale & retail | 2022 |
| Myhouse Agents Ltd | Real estate | 2019 |
| Mylondonplace (Britannia) Ltd | Real estate | 2022 |