| Lucid Advice Limited | Professional & scientific | 2022 |
| Lucky Panda 33 Limited | Hospitality | 2023 |
| Lulu Holdings Limited | Financial services | 2020 |
| Lumora Safety Limited | Professional & scientific | 2025 |
| Lunacorso Ltd | Transport & logistics | 2025 |
| Lustre Electrical Ltd | Wholesale & retail | 2022 |
| LY Joinery Ltd | Construction | 2024 |
| Lyndhurst Shoe Company Limited | Wholesale & retail | 1996 |
| M & J Construction Lancs Limited | Construction | 2001 |
| M Booth Construction Ltd | Construction | 2009 |
| M E Construct Ltd | Construction | 2025 |
| M O'Keefe Haulage Limited | Transport & logistics | 2017 |
| M R GAS & Heating Installations Limited | Construction | 2012 |
| M Star Turkish Barber Limited | Other services | 2024 |
| M W H C Limited | Wholesale & retail | 2005 |
| M2 Structural Maintenance Ltd | Construction | 2019 |
| MA and a Properties Ltd | Real estate | 2026 |
| MA Grab Hire Limited | Water & waste | 2015 |
| Macgregor Black Executive Limited | Administrative & support | 2020 |
| Macy’S Mucky Pups Limited | Agriculture & fishing | 2023 |
| Maden Support Services Ltd | Public administration | 2025 |
| Maene Ltd | Wholesale & retail | 2025 |
| Maha Business Solutions Ltd | Professional & scientific | 2025 |
| Majestic Accountancy Services Limited | Professional & scientific | 2012 |
| MAK3 Limited | Construction | 2023 |
| Mamara Services Ltd | Health & social care | 2010 |
| Manchester and Rossendale Speech Therapy Ltd | Health & social care | 2023 |
| Mannings Bakery Limited | Manufacturing | 2013 |
| Manr Ltd | Hospitality | 2025 |
| Manticore Security Ltd | Administrative & support | 2022 |
| Maraco Ltd | Wholesale & retail | 2023 |
| Marjax Logistics Ltd | Transport & logistics | 2003 |
| Mark Cull Limited | Information & communication | 2007 |
| Mark Grogan Web Consulting Limited | Information & communication | 2019 |
| Mark Nixon Limited | Real estate | 2015 |
| Mark& Joanne Lynch Limited | Other services | 2014 |
| Materials & Insulation Detection Systems Limited | Professional & scientific | 2020 |
| Mattresstek Ltd | Manufacturing | 2017 |
| MBS Projects Ltd | Construction | 2019 |
| Mccaw School of Dance Ltd | Arts & recreation | 2025 |
| Mcdermott Procurement Services Ltd | Professional & scientific | 2023 |
| Mckinlay Gray's Limited | Professional & scientific | 2023 |
| MCR Mini Market Ltd | Wholesale & retail | 2025 |
| Mcsound Ltd | Information & communication | 2019 |
| MD Engineering Support Ltd | Professional & scientific | 2025 |
| MDG Engineering & Surveying Ltd | Professional & scientific | 2013 |
| MDO Plumbing & Heating Limited | Construction | 2018 |
| Mdps Consulting Ltd | Administrative & support | 2011 |
| ME Property Group N/W Ltd | Construction | 2025 |
| Meandering Consulting Services Limited | Information & communication | 2015 |
| Mechanical Engineering Solutions Ltd. | Manufacturing | 2017 |
| Mechatech Limited | Manufacturing | 2013 |
| Media Stand Limited | Other services | 2021 |
| Melbec Microbiology Ltd | Professional & scientific | 2013 |
| Melia Analysis Ltd | Professional & scientific | 2019 |
| Mellor Brook Management Company Limited | Households | 2023 |
| Melvin Trading Ltd | Wholesale & retail | 2024 |
| MENDOZA2 Ltd | Hospitality | 2020 |
| Merit Rewards Ltd | Information & communication | 2026 |
| MH2R Learning Limited | Professional & scientific | 2014 |
| Mhudson Ltd | Professional & scientific | 2022 |
| Mian MAZ Ltd | Wholesale & retail | 2020 |
| Michael Curran Freelance Hairdresser Ltd | Other services | 2004 |
| Micom Solutions Ltd | Information & communication | 2024 |
| Middleton Beauty Consultancy Ltd | Education | 2025 |
| Mika BOO Limited | Other services | 2016 |
| Mike Aston Cleaning Services Ltd | Administrative & support | 2023 |
| Mike Ingham Financial Planning Limited | Financial services | 2005 |
| Millers Green (Worsthorne) Management Company Limited | Households | 2022 |
| Millon Foods Ltd | Hospitality | 2024 |
| Millon Spice Ltd | Hospitality | 2026 |
| Mimi Pizza Bar Ltd | Hospitality | 2025 |
| Mimis Kebab and Pizza Ltd | Hospitality | 2026 |
| Mimis Pizza and Kebab Limited | Hospitality | 2026 |
| Mimis Pizza Limited | Hospitality | 2025 |
| Minieiev Tech Ltd | Information & communication | 2025 |
| Miova Ltd | Professional & scientific | 2022 |
| Mission Impossible Limited | Other services | 1997 |
| Mixo Desserts Ltd | Hospitality | 2025 |
| MJR Closers Ltd | Professional & scientific | 2025 |
| MKH Optical Limited | Health & social care | 2022 |
| ML 43 Limited | Health & social care | 2017 |
| Mobile Welding NW Ltd | Professional & scientific | 2016 |
| Mocioc Properties Ltd | Real estate | 2024 |
| Mode Global Logistics Limited | Transport & logistics | 2026 |
| Modfather Vapes Haslingden Ltd | Wholesale & retail | 2023 |
| Mogley Logistics Ltd | Transport & logistics | 2024 |
| Mohammed Raeece Khan Limited | Extraterritorial | 2024 |
| Moneyteam Ltd | Health & social care | 2023 |
| More in the Room CIC | Education | 2022 |
| Morris Real Estate Ltd | Real estate | 2017 |
| Morris-Last Plumbing & Heating Ltd | Construction | 2023 |
| Motor House Blackburn Ltd | Wholesale & retail | 2022 |
| Motor Services (Rossendale) Limited | Wholesale & retail | 1979 |
| Motorhome Marketplace North West Ltd | Wholesale & retail | 2025 |
| MR Fitzpatrick's Limited | Manufacturing | 2010 |
| MR Pink Shop Ltd | Wholesale & retail | 2026 |
| Muck OUT Ltd | Transport & logistics | 2023 |
| Muhammad Unais Ltd | Wholesale & retail | 2025 |
| Mulberry Roots Limited | Education | 2018 |