| Lana C Limited | Other services | 2005 |
| Lancashire Investments Limited | Extraterritorial | 2003 |
| Landlordshield Limited | Information & communication | 2025 |
| Lavin & Lloyd Ltd | Wholesale & retail | 2026 |
| LDD Installations Ltd | Construction | 2022 |
| Leaf Environmental Services Ltd | Water & waste | 2017 |
| Learnactive NW Ltd | Education | 2024 |
| Leeds West Property Management Company Limited | Real estate | 2017 |
| LF Automotive Ltd | Wholesale & retail | 2020 |
| Lifterz (Scot) Limited | Administrative & support | 2017 |
| Lifterz Limited | Administrative & support | 2006 |
| Limpet Limited | Information & communication | 2014 |
| Links to Power Limited | Construction | 2024 |
| Lisasarah Limited | Hospitality | 2023 |
| Liscannor Ice Cream Ltd | Hospitality | 2026 |
| Listerdale PM Consultants Ltd | Professional & scientific | 2026 |
| Litlec Ltd | Manufacturing | 2024 |
| Litlet Ltd | Real estate | 2025 |
| Little Stars Party Dances Ltd | Health & social care | 2026 |
| LJ Sales Group Ltd | Wholesale & retail | 2025 |
| Luke Price and Sons Ltd | Other services | 2017 |
| Lunar Trading Supply Ltd | Wholesale & retail | 2026 |
| Luntswood Properties Limited | Real estate | 2019 |
| Lupo Strega Limited | Information & communication | 2026 |
| LUX Design Consultancy Limited | Wholesale & retail | 2018 |
| Luxe and Live Ltd | Real estate | 2025 |
| Luxe Living Hub Limited | Wholesale & retail | 2026 |
| Luxe Living Mart Limited | Wholesale & retail | 2025 |
| Luxury Inspired Design Ltd | Wholesale & retail | 2025 |
| M & M Groundwork Limited | Construction | 2013 |
| M.I.M Giraffe Ltd | Hospitality | 2023 |
| M1NT Studio Ltd | Professional & scientific | 2020 |
| Madamar Group Ltd | Construction | 2026 |
| MAJ Transport Services Ltd | Transport & logistics | 2019 |
| Majestic Stays IOM Ltd | Real estate | 2025 |
| Mamma J'S Coffee House Ltd | Hospitality | 2025 |
| Management and Commercial Services Limited | Professional & scientific | 2014 |
| Mankai Partners Limited | Professional & scientific | 2026 |
| Marek and Co Developments Ltd | Construction | 2024 |
| Mark Neary Construction and Management Ltd | Administrative & support | 2016 |
| Marlin Property Solutions Ltd | Real estate | 2022 |
| Marshsankey Ltd | Real estate | 2019 |
| Martin JON Limited | Other services | 2003 |
| Martin's Roofing & Maintenance Ltd | Construction | 2018 |
| Massive Deals Ltd | Wholesale & retail | 2024 |
| Matt Macaw Ltd | Professional & scientific | 2025 |
| Maximel Plastering Limited | Construction | 2017 |
| Maximise Sports Therapy Limited | Health & social care | 2024 |
| Mazins Health Care Ltd | Health & social care | 2025 |
| MC Personnel Limited | Administrative & support | 1998 |
| MC Personnel Transport Limited | Professional & scientific | 2021 |
| Mcginn Ltd | Professional & scientific | 2024 |
| MD GAS and Renewables Ltd | Energy | 2026 |
| Meadow Barbecue Limited | Wholesale & retail | 2003 |
| Meadowbank Landscaping Ltd | Administrative & support | 2026 |
| Meadowbank Properties Worldwide Ltd | Real estate | 2025 |
| Mechinos Limited | Professional & scientific | 2022 |
| Meganny Ltd | Wholesale & retail | 2022 |
| Melanie Green Financial Planning Limited | Financial services | 2021 |
| MELKAN19 Ltd | Hospitality | 2025 |
| Meowise Ltd | Hospitality | 2025 |
| Mercury Hampton Contract Ltd | Professional & scientific | 2021 |
| Mercury Hampton Executive Performance Limited | Administrative & support | 2025 |
| Mercury Hampton International Ltd | Administrative & support | 2025 |
| Mercury Hampton Ltd | Administrative & support | 2017 |
| Meteorite Innovations Ltd | Information & communication | 2025 |
| MG Accounting Service UK Limited | Professional & scientific | 2016 |
| MH Global Consulting & Services Ltd | Professional & scientific | 2026 |
| MH Rapid Industrial Services Ltd | Administrative & support | 2026 |
| MH Supply & Distribution Ltd | Wholesale & retail | 2025 |
| MI I.T GUY Limited | Information & communication | 2013 |
| Mia's Properties Limited | Real estate | 2023 |
| Michelle Harris Consulting Ltd | Professional & scientific | 2024 |
| Micro Computer Consultants Group Limited | Financial services | 2021 |
| Micro Computer Consultants Limited | Information & communication | 1981 |
| Mike Wire Electrical Ltd | Construction | 2021 |
| Milano Warrington Ltd | Hospitality | 2026 |
| Million Nails & Spa Limited | Other services | 2026 |
| Million Nails Limited | Other services | 2018 |
| Ministry VA Ltd | Administrative & support | 2019 |
| MJ Industrial Roofing & Cladding Limited | Construction | 2021 |
| MKB Realty Ltd | Real estate | 2025 |
| MKWAY4 Ltd | Transport & logistics | 2023 |
| MLC Ventures Limited | Real estate | 2020 |
| Mlmt Ltd | Information & communication | 2017 |
| MN Media Ltd | Information & communication | 2026 |
| Modern Air Solutions Ltd | Construction | 2023 |
| MON Photography Ltd | Professional & scientific | 2025 |
| Monastery Garden Supplies Ltd | Administrative & support | 2023 |
| Moov-Me (North West) Limited | Information & communication | 2015 |
| More Life MCR Ltd | Other services | 2023 |
| MPB Services Newton LE Willows Ltd | Wholesale & retail | 2025 |
| MPW Electrical Security Services Ltd | Construction | 2020 |
| MRA Plumbing and Heating Ltd | Construction | 2026 |
| Mrwtrades Limited | Education | 2025 |
| My Education Services Ltd | Education | 2020 |
| My Secured Loan Limited | Financial services | 2021 |
| N K Wheel Services Ltd | Manufacturing | 2019 |
| N-Jane Aesthetics Ltd | Other services | 2025 |
| NAE CAD Limited | Professional & scientific | 2024 |