| Money Matters (Merseyside) Ltd | Wholesale & retail | 2010 |
| Money Traders (NS) Limited | Wholesale & retail | 2014 |
| Moneymore Manufacturing Ltd | Wholesale & retail | 2025 |
| Monitor and Merrimac Limited | Arts & recreation | 1958 |
| Monks Training Services Limited | Professional & scientific | 2010 |
| Mono Yachting Ltd | Extraterritorial | 2024 |
| Monster Pet Supplies (UK) Ltd | Wholesale & retail | 2011 |
| Montague's Candy Ltd | Manufacturing | 2019 |
| Monterey Property Limited | Construction | 2025 |
| Montgomery NDT Services Ltd | Professional & scientific | 2025 |
| Monumental Conservation Ltd | Manufacturing | 2019 |
| Mooboo Blackpool Limited | Hospitality | 2022 |
| Moonstone Tangerine Ltd | Financial services | 2025 |
| Moor Nook Chippy Ltd | Hospitality | 2020 |
| Moorburn Manor Limited | Health & social care | 1997 |
| Moore Readymix Holdings Limited | Professional & scientific | 2014 |
| Moore Readymix Limited | Manufacturing | 1998 |
| Moores Builders Lancashire Properties Limited | Real estate | 2011 |
| Moorland Road Management Company Limited | Households | 2020 |
| Moorning Milk Ltd | Wholesale & retail | 2022 |
| Moorsyde North Ltd | Wholesale & retail | 2025 |
| More Roomz Ltd | Hospitality | 2025 |
| Morley Car Sales Limited | Wholesale & retail | 2019 |
| Mornadev Ltd | Information & communication | 2018 |
| Morro Holdings Limited | Real estate | 2026 |
| Mortalogix Limited | Transport & logistics | 2018 |
| Mortgage My Homes Limited | Financial services | 2018 |
| Mortgage Search NW Limited | Financial services | 2019 |
| Mortgage Securitisation Claims Ltd | Other services | 2018 |
| MORTGAGE42 Ltd | Financial services | 2025 |
| Mosaic Enterprises Limited | Wholesale & retail | 2014 |
| Mosc Ltd | Wholesale & retail | 2023 |
| Moseley Mortgage Services Limited | Professional & scientific | 2017 |
| Moss MEN Limited | Real estate | 2023 |
| Mosswood Properties Ltd | Real estate | 2025 |
| Motaspares Ltd | Wholesale & retail | 2012 |
| Motek Mechanics Ltd | Wholesale & retail | 2019 |
| Mothers Mane Ltd | Manufacturing | 2025 |
| Motorcycle Repair Centre Blackpool Ltd | Wholesale & retail | 2025 |
| Motoringco Ltd | Wholesale & retail | 2025 |
| Motorsound Limited | Wholesale & retail | 2019 |
| Motorsport Developments Blackpool Limited | Wholesale & retail | 2010 |
| Motorstar UK Limited | Wholesale & retail | 2018 |
| Motortech (Blackpool) Ltd | Wholesale & retail | 2026 |
| Mount Housing Ltd | Real estate | 2020 |
| Mountain Box Limited | Professional & scientific | 2015 |
| Mourne and Foyle Ltd | Wholesale & retail | 2025 |
| Move Holmes Limited | Real estate | 2016 |
| Movie Signs Ltd. | Information & communication | 2015 |
| Mowbray Drive MOT Centre Ltd | Wholesale & retail | 2021 |
| Mowbray Drive Motors Ltd | Wholesale & retail | 2021 |
| Mowbray Holdings Limited | Financial services | 2001 |
| Mowbray Rock Ltd | Wholesale & retail | 2025 |
| Mowbreck Park Limited | Hospitality | 1992 |
| Mowow Capital Ltd | Information & communication | 2021 |
| Mowow Studios Ltd | Information & communication | 2017 |
| Moxiaire Ltd | Wholesale & retail | 2023 |
| Moyallan Developments Ltd | Wholesale & retail | 2025 |
| Moyle Hill Properties Ltd | Wholesale & retail | 2025 |
| MPB Building Ltd | Construction | 2022 |
| MPG IT Ltd | Information & communication | 2017 |
| Mpgm Ltd | Construction | 1996 |
| MPK Events Ltd | Professional & scientific | 2014 |
| MPOWERED247 Limited | Wholesale & retail | 2024 |
| MPP Hospitality Limited | Hospitality | 2019 |
| MPS Solutions (N/W) Limited | Wholesale & retail | 2023 |
| MR Chip Limited | Administrative & support | 2009 |
| MR G'S Catering Ltd | Hospitality | 2025 |
| MR Gee's Limited | Wholesale & retail | 2004 |
| MR Grab Limited | Construction | 2016 |
| MR G’S Bispham Ltd | Hospitality | 2024 |
| MR Hiab Ltd | Extraterritorial | 2019 |
| MR King Limited | Extraterritorial | 1983 |
| MR P'S Resources Ltd | Professional & scientific | 2024 |
| MR Sandmans Hotel Ltd | Hospitality | 2023 |
| MR Trimmers 1 Limited | Other services | 2026 |
| MR Whippy Blackpool Ltd | Hospitality | 2026 |
| MR. MIM World of Entertainment Limited | Other services | 2004 |
| MRA Car Wash Limited | Wholesale & retail | 2018 |
| MRC Services (NW) Ltd | Construction | 2018 |
| MRK Property Rentals Limited | Real estate | 2024 |
| Mrph Mechanical Engineers Ltd | Construction | 2013 |
| MRQ Consulting Ltd. | Information & communication | 2013 |
| MRS Buffet Limited | Hospitality | 2011 |
| MS NDT Inspections Services Limited | Manufacturing | 2023 |
| MSC Media & Marketing Ltd. | Administrative & support | 2019 |
| Mschen Ltd | Hospitality | 2026 |
| MSD Lettings Limited | Real estate | 2019 |
| MSD Performance Ltd | Wholesale & retail | 2014 |
| MSG (NW) Ltd | Other services | 2022 |
| MSG Inspections Limited | Mining & quarrying | 2020 |
| MSG Investment Holdings Ltd | Financial services | 2022 |
| MSG Property Developments Ltd | Construction | 2022 |
| MSP Projects Limited | Construction | 2022 |
| MSR Lean Consultants Ltd | Professional & scientific | 2022 |
| MTB Projects Limited | Information & communication | 2017 |
| MTC Couriers Limited | Transport & logistics | 2014 |
| MTD 4 Subbies Limited | Construction | 2026 |
| Mtec (NW) Limited | Manufacturing | 2013 |
| Muddock Yacht Limited | Extraterritorial | 2025 |