| Lexo 1961 Ltd | Administrative & support | 2021 |
| Leyburn Racing Limited | Arts & recreation | 1997 |
| LG Roofing Limited | Construction | 2013 |
| Lifestyle Leisure Products Ltd | Wholesale & retail | 2009 |
| Lightman Group Ltd | Professional & scientific | 2010 |
| Lightman Properties Ltd | Real estate | 2019 |
| Limitprop Limited | Construction | 1981 |
| Link Crane Industry Support Ltd | Construction | 2024 |
| Lionrock Haulage Limited | Transport & logistics | 2025 |
| Lisa Mccarton - Beespoke Mortgages Limited | Financial services | 2020 |
| Little Coffee BEE Limited | Hospitality | 2010 |
| Little Minds LAB Ltd | Information & communication | 2025 |
| Littlemoss Properties Limited | Real estate | 2016 |
| LIV Sleator Garden Design Ltd | Administrative & support | 2023 |
| Liveside Technical Services Partnership LLP | | 2001 |
| Living Nature Wellness CIC | Education | 2022 |
| LIZ Mclean Limited | Health & social care | 2024 |
| LJV+ Ltd | Real estate | 2026 |
| LKM Surfacing (North West) Limited | Construction | 2017 |
| LLG Lifting Ltd | Construction | 2023 |
| LMB Entertainment Ltd | Arts & recreation | 2026 |
| LMB Maintenance Limited | Construction | 2012 |
| LMB Property Development (NW) Limited | Construction | 2021 |
| LMC Maverick Limited | Real estate | 2025 |
| LMJ (24) Limited | Wholesale & retail | 2024 |
| Logic Lifting Ltd | Construction | 2021 |
| Logic Motorsport Ltd | Wholesale & retail | 2021 |
| Logichem Waste Solutions Limited | Water & waste | 2013 |
| Lomax Investment Group Ltd | Real estate | 2026 |
| Lomax Renovation Solutions Ltd | Construction | 2025 |
| Lomax Trade Solutions Ltd | Construction | 2025 |
| London Architectural Solutions (Techtonic UK) Limited | Manufacturing | 2021 |
| Longdendale Autos Limited | Wholesale & retail | 2012 |
| Loram Lettings Ltd | Real estate | 2013 |
| Lorodiarry Limited | Wholesale & retail | 2025 |
| Lostock House Limited | Professional & scientific | 2012 |
| Louis Frank Properties Ltd | Real estate | 2025 |
| Louver-Lite Limited | Manufacturing | 1971 |
| Louvolite Fabrics Limited | Manufacturing | 1973 |
| Love and Faith Believers Church International Ltd | Other services | 2025 |
| Love Beauty Gatley Ltd | Other services | 2018 |
| Love Padel Ltd | Arts & recreation | 2024 |
| Loverocket Limited | Real estate | 2023 |
| LOW Cost Trade Windows Limited | Wholesale & retail | 2011 |
| LPG Bargains Limited | Wholesale & retail | 2025 |
| Lsgm Lettings Ltd | Real estate | 2025 |
| Lucan & Daughters Limited | Real estate | 2025 |
| Lucky Squid Limited | Transport & logistics | 2022 |
| Luminary Public Relations Limited | Professional & scientific | 2023 |
| Luna Laboratory Supplies Limited | Wholesale & retail | 2025 |
| Luno Groundworks Ltd | Construction | 2026 |
| Luno Media Ltd | Construction | 2026 |
| Lupo Coaching Limited | Education | 2021 |
| Luxe Light Northwest Limited | Administrative & support | 2024 |
| Luxora Transfers Ltd | Transport & logistics | 2026 |
| M & J Properties Saddleworth Ltd | Real estate | 2018 |
| M & Sons Holdings Limited | Hospitality | 2024 |
| M a Reid Consultancy Limited | Professional & scientific | 2022 |
| M Ashworth Machinery Removals Limited | Transport & logistics | 2024 |
| M M Automobiles Limited | Wholesale & retail | 2026 |
| M S a a Consultants Limited | Administrative & support | 2019 |
| M Tomlinson Build & Maintenance Ltd | Construction | 2024 |
| M Tomlinson Scaffolding Ltd | Construction | 2024 |
| M&M Dreams Limited | Wholesale & retail | 2026 |
| M&S Supply LAB Limited | Wholesale & retail | 2026 |
| M. Adams (Floorcoverings) Limited | Construction | 1977 |
| M.A.Kahhar Optical Limited | Health & social care | 2023 |
| M.J. Connelly Furnishings Limited | Wholesale & retail | 2003 |
| M.R Travel Hyde Limited | Administrative & support | 2019 |
| M4WIND Ltd | Construction | 2022 |
| M7 Projects (Yorkshire) Limited | Construction | 2024 |
| MA Pamboli Ltd | Education | 2022 |
| MAC Property Rentals Ltd | Real estate | 2025 |
| Mackintosh Advisory Ltd | Professional & scientific | 2021 |
| Macpactor International | Real estate | 1995 |
| Macpactorcare Limited | Extraterritorial | 1983 |
| Made by Astill Ltd | Professional & scientific | 2021 |
| Made by Raymo Ltd | Professional & scientific | 2009 |
| Madec Construction Ltd | Construction | 2023 |
| Madeeha Property Management Limited | Real estate | 2023 |
| Maden the UK Ltd | Wholesale & retail | 2023 |
| Madina Homes MCR Ltd | Real estate | 2025 |
| Magic Hatton Ltd | Arts & recreation | 2023 |
| Magnetes Pictures Limited | Information & communication | 2016 |
| Mahant Ltd | Real estate | 2026 |
| Maids 4 Homes Ltd. | Administrative & support | 1992 |
| Main Fast Food Ltd | Hospitality | 2022 |
| Maintenance & Construction Engineers Limited | Real estate | 1962 |
| Majid Enterprise Ltd | Manufacturing | 2009 |
| Making a Difference - Tameside | Health & social care | 2002 |
| Maleeha Education Services Limited | Administrative & support | 2018 |
| Mallard & Mckellar Home Improvements Limited | Construction | 2010 |
| Mallard Roofline Limited | Manufacturing | 2010 |
| Malpas Holdings | Real estate | 2017 |
| MAM Prop Ltd | Real estate | 2025 |
| Mamma Julie’S Limited | Wholesale & retail | 2024 |
| Managed INK Limited | Administrative & support | 1999 |
| Managed Tech Limited | Administrative & support | 2025 |
| Managers Circle Ltd | Professional & scientific | 2023 |
| Mancbee Firmware Solution Limited | Information & communication | 2026 |