| Mark White Electrical Limited | Construction | 2013 |
| Marker Lettings Ltd | Real estate | 2025 |
| Marlee Homes Ltd | Real estate | 2019 |
| Marsh Street Arches and Garden Community Interest Company | Arts & recreation | 2008 |
| Marsh Street Stores Limited | Wholesale & retail | 2002 |
| Mass Kitchen Ltd | Hospitality | 2025 |
| Mass Offshore Limited | Construction | 2013 |
| Mass Renewables Ltd | Financial services | 2026 |
| Matt Higgins Limited | Information & communication | 2018 |
| Matt Johnson Prestige Ltd | Wholesale & retail | 2018 |
| Matt Scaffolding Ltd | Construction | 2024 |
| Matt Williamson Media Ltd | Professional & scientific | 2022 |
| Maxwell Lettings Developments Limited | Real estate | 2025 |
| Maxwell Lettings Holdings Limited | Real estate | 2025 |
| Maxwell Lettings Limited | Real estate | 2022 |
| May's Thai Treats Limited | Hospitality | 2020 |
| May's Thai Treats Wholesale Limited | Wholesale & retail | 2022 |
| Mayfair Global Properties Ltd | Hospitality | 2018 |
| MC Autos Barrow Limited | Wholesale & retail | 2025 |
| MC GAS Services Ltd | Construction | 2018 |
| MC Risk Consultants Limited | Administrative & support | 2015 |
| Mccarthy Consulting Engineers Ltd | Professional & scientific | 2022 |
| Mcgoverns Machinery and Fabrications Ltd | Manufacturing | 2026 |
| Mcleys Bakery Limited | Wholesale & retail | 2003 |
| MD ALI RAJ Limited | Hospitality | 2025 |
| MD Electrical Lancs Ltd | Construction | 2025 |
| Mean Moor Wind Farm Ltd | Energy | 2014 |
| Medic Matt Ltd | Health & social care | 2016 |
| Mediventuk Ltd | Professional & scientific | 2025 |
| Medu Studios Limited | Wholesale & retail | 2026 |
| Melford 19 Ltd | Real estate | 2019 |
| Mellen & Co. Limited | Other services | 2010 |
| Melville & Co Accountants Limited | Professional & scientific | 2015 |
| MG Installations South Lakes Ltd | Construction | 2022 |
| Microsolutions IT Limited | Information & communication | 2012 |
| Milkshake Madness (Dalton) Ltd | Hospitality | 2020 |
| Mill Brow Holdings Limited | Real estate | 2023 |
| MIN MM Trading Ltd | Wholesale & retail | 2024 |
| Mind in Furness Limited | Administrative & support | 2011 |
| Mini & ME - the Role Play Village Ltd | Arts & recreation | 2025 |
| Mission Critical Pmcm Ltd | Construction | 2026 |
| Mitra Fusion Ltd | Hospitality | 2026 |
| MJ Hairdressing Limited | Other services | 2007 |
| MJG GAS Ltd | Construction | 2018 |
| MJL IT Consultancy Ltd | Information & communication | 2022 |
| Mjw-C Ltd | Real estate | 2026 |
| MKB (Northwest) Limited | Manufacturing | 2017 |
| MLP Rentals Ltd | Real estate | 2025 |
| Mlttransportuk Ltd | Administrative & support | 2015 |
| MMX Event Solutions Limited | Arts & recreation | 2010 |
| MN Drylining Limited | Construction | 2017 |
| Modoko Ltd | Wholesale & retail | 2022 |
| Moduflow FAN Systems Ltd. | Manufacturing | 2002 |
| Monkey Access Limited | Administrative & support | 2008 |
| More Holdings (U.K.) Ltd | Financial services | 2024 |
| Morrell Property Management Ltd | Real estate | 2017 |
| Mortgage Adviceworks Limited | Financial services | 2021 |
| Mpat Services Ltd | Other services | 2023 |
| MPH Holdings (NW) Ltd | Real estate | 2023 |
| Mrdetailing Ltd | Wholesale & retail | 2020 |
| MSH Aesthetics & Wellness Ltd | Health & social care | 2023 |
| MSH Healthcare Ltd | Health & social care | 2018 |
| MSH Medicare Ltd | Professional & scientific | 2020 |
| MSH Pipe Services Ltd | Professional & scientific | 2024 |
| Multan Handicrafts Ltd | Wholesale & retail | 2025 |
| Multi Fuel Supplies Barrow Ltd | Wholesale & retail | 2023 |
| Munyaradzi Mangwiro Logistics 360 Ltd | Transport & logistics | 2024 |
| Murray Quality Services Limited | Professional & scientific | 2025 |
| Muse Mind Limited | Wholesale & retail | 2025 |
| Mutton Lakeland Estates Ltd | Real estate | 2026 |
| Mutton Lakeland Properties Ltd | Construction | 2026 |
| MW Working Dogs Ltd | Agriculture & fishing | 2024 |
| My Smile Zone Limited | Health & social care | 2015 |
| Mysticliving Ltd | Arts & recreation | 2023 |
| Mytownhub Ltd | Information & communication | 2026 |
| N T Education & Skills Limited | Education | 2017 |
| N-Twenty Limited | Real estate | 2019 |
| N.A.R Utility Solutions Ltd | Construction | 2024 |
| Nailed Down Roofing Ltd | Construction | 2024 |
| Nandhi Limited | Information & communication | 2017 |
| Nathan Park Roofing and Building Limited | Construction | 2026 |
| NC Meats Limited | Wholesale & retail | 2017 |
| New Crystal Vision Limited | Wholesale & retail | 2010 |
| New HK Diner Limited | Hospitality | 2022 |
| Newcommons.Uk Ltd | Information & communication | 2025 |
| Nexus Project Consultancy Ltd | Other services | 2024 |
| Nexus Rental Properties Ltd | Real estate | 2026 |
| Niall Doherty Ltd | Professional & scientific | 2020 |
| Nichol END Marine Limited | Arts & recreation | 2013 |
| Nicholson Commercial Consultants Limited | Professional & scientific | 2013 |
| Nick Armstrong Limited | Professional & scientific | 2013 |
| Night at the Proms Ltd | Wholesale & retail | 2024 |
| Niviya Ltd | Real estate | 2025 |
| NJ Beauty Retreat Ltd | Other services | 2025 |
| NO 1 Shoe Care Ltd | Administrative & support | 2021 |
| Nook Fabrication Limited | Manufacturing | 2014 |
| Norfolk Business Systems Ltd | Information & communication | 1996 |
| North Lonsdale Agricultural Society | Other services | 1999 |
| North West Bolting Limited | Manufacturing | 2018 |
| North West Community Skateparks CIC | Education | 2025 |