| M&N Media Ltd | Professional & scientific | 2026 |
| M&N Outlet Ltd | Other services | 2021 |
| M&N Store Ltd | Other services | 2025 |
| M&N Sushi Ltd | Wholesale & retail | 2024 |
| M&R Properties/Holdings Ltd | Real estate | 2022 |
| M&R Services England Limited | Other services | 2018 |
| M&S Landscaping Limited | Administrative & support | 2024 |
| M&S NW Fuel Services Ltd | Wholesale & retail | 2022 |
| M&T Investments Group Ltd | Real estate | 2021 |
| M&Z Northern Limited | Financial services | 2017 |
| M-Belle-Ish Ltd | Wholesale & retail | 2016 |
| M-Fix-Tech Limited | Wholesale & retail | 2019 |
| M-Optometry Limited | Health & social care | 2023 |
| M-Tech Digital LAB Limited | Information & communication | 2024 |
| M-W New Generation Ltd | Hospitality | 2018 |
| M. Abbas & Sons Ltd | Real estate | 2024 |
| M. Aslam&Anwar Services Ltd | Transport & logistics | 2026 |
| M. B. Hampson (Q.S. Services) Ltd. | Professional & scientific | 1998 |
| M. Logan & Sons Limited | Construction | 2001 |
| M. W. Window Cleaning Services Ltd | Administrative & support | 2025 |
| M. Williamson Services Ltd. | Professional & scientific | 1996 |
| M. Withall (Plant Operator Services) Ltd | Construction | 2010 |
| M.A Techmart Limited | Wholesale & retail | 2025 |
| M.A. Begum Enterprise Ltd | Hospitality | 2025 |
| M.A. Mission Learning Centre | Other services | 2010 |
| M.A. Service Centre Ltd | Wholesale & retail | 2011 |
| M.A.C Planning Limited | Professional & scientific | 2019 |
| M.A.C. Marketing Services Limited | Professional & scientific | 2019 |
| M.A.G Laser/Press Consultation and Production Ltd | Manufacturing | 2026 |
| M.A.H.B Properties Ltd | Real estate | 2025 |
| M.A.J Construction (Bolton) Ltd | Construction | 2019 |
| M.C. Walker and Sons (Westhoughton) Limited | Professional & scientific | 1955 |
| M.E Boilers Ltd | Construction | 2024 |
| M.E.N.D Car & Commercial Ltd | Wholesale & retail | 2015 |
| M.G.Heating at Pluming Ltd | Construction | 2021 |
| M.H. Cragg & Sons Holdings Limited | Financial services | 2018 |
| M.I. Event Services Ltd | Hospitality | 2023 |
| M.I.A.D. Newsagents Ltd | Wholesale & retail | 2019 |
| M.I.K Outlet Limited | Wholesale & retail | 2025 |
| M.J. Blinds Limited | Wholesale & retail | 2006 |
| M.K.L. Automation Limited | Manufacturing | 2000 |
| M.L Trading Corp Ltd | Wholesale & retail | 2025 |
| M.L. Transportation Services UK Limited | Transport & logistics | 2025 |
| M.R.L. (Seeds) Limited | Agriculture & fishing | 1998 |
| M.S Auto Machine Ltd | Wholesale & retail | 2023 |
| M.S.S.J Holdings Ltd | Wholesale & retail | 2020 |
| M.S.S.J. Chatwood Holdings Ltd | Mining & quarrying | 2023 |
| M.T Belly's (Original) Ltd | Hospitality | 2025 |
| M.Tariq Ltd | Wholesale & retail | 2025 |
| M.Taylor Services Ltd | Construction | 2008 |
| M.W. Rana Limited | Health & social care | 2022 |
| M.Y Propandlett Ltd | Households | 2025 |
| M/E CV Writer Limited | Professional & scientific | 2025 |
| M1 Nails Horwich Ltd | Other services | 2025 |
| M1 Support Ltd | Health & social care | 2019 |
| M100W Ltd | Real estate | 2023 |
| M12A Investing Limited | Administrative & support | 2022 |
| M12A Ltd | Information & communication | 2018 |
| M200W Limited | Professional & scientific | 2025 |
| M28 Travel Ltd | Transport & logistics | 2026 |
| M2BLS Limited | Professional & scientific | 2017 |
| M2G Benefits Ltd | Administrative & support | 2023 |
| M2M Interior Limited | Construction | 2025 |
| M2P2 Ltd | Transport & logistics | 2022 |
| M3 Medical Writing Limited | Administrative & support | 2022 |
| M300W Limited | Financial services | 2025 |
| M60 Holdings Limited | Financial services | 2025 |
| M60 Self Storage Limited | Real estate | 2011 |
| M66 Car Sales Limited | Wholesale & retail | 2007 |
| M8 Windows Limited | Construction | 2024 |
| M84 Holdings Limited | Construction | 2025 |
| MA (UK) Ltd | Health & social care | 2010 |
| MA 01 Limited | Financial services | 2021 |
| MA Accounting Services Ltd | Professional & scientific | 2018 |
| MA Associates (NW) Ltd | Information & communication | 2021 |
| MA Experts Ltd | Health & social care | 2013 |
| MA Exterior Maintenance Ltd | Administrative & support | 2026 |
| MA Financial Accountants Ltd | Professional & scientific | 2024 |
| MA Land and Investment Limited | Real estate | 2019 |
| MA Links Ltd | Wholesale & retail | 2022 |
| MA Mart PK Ltd | Wholesale & retail | 2023 |
| MA Property Group (NW) Limited | Households | 2025 |
| MA Software Engineering Services Limited | Information & communication | 2018 |
| MA Techno Ltd | Wholesale & retail | 2020 |
| MA00 Ltd | Health & social care | 2022 |
| MAA Contracting Services Ltd | Transport & logistics | 2025 |
| Maamejoe Ltd | Health & social care | 2022 |
| Maana Bakery Ltd | Manufacturing | 2026 |
| Maanyaa Ltd | Professional & scientific | 2026 |
| Maas Corporation Ltd | Financial services | 2025 |
| Maas Healthcare Ltd | Financial services | 2009 |
| Maas Limited | Construction | 2018 |
| MAB Bolton Limited | Construction | 2011 |
| MAB Financial Ltd | Professional & scientific | 2026 |
| Maba Local Limited | Wholesale & retail | 2025 |
| Mabie Holdings Limited | Real estate | 2021 |
| MAC (OHL) Sales Consultancy Limited | Professional & scientific | 2014 |
| MAC Electrical Group Limited | Construction | 2025 |
| MAC MCG Property Ltd | Real estate | 2023 |
| MAC Medicare Limited | Health & social care | 2016 |