| Mount Eaton Court Limited | Households | 1991 |
| Mount Folly (Bodmin) Management Company Ltd | Households | 2023 |
| Mount Folly Development Ltd | Construction | 2020 |
| Mount Fuji International Limited | Wholesale & retail | 1999 |
| Mount Grange Management Company Limited | Households | 2018 |
| Mountain Movement Ltd | Administrative & support | 2019 |
| Mountlane Estates Limited | Construction | 2006 |
| Mountlane Properties Limited | Real estate | 2021 |
| Mouse of Books Limited | Information & communication | 2025 |
| Moxie Hair Ltd | Other services | 2026 |
| MP Detailing Limited | Wholesale & retail | 2026 |
| MP Hire Limited | Administrative & support | 1999 |
| Mp-Bds Ltd | Health & social care | 2012 |
| MPM Real Estate Limited | Real estate | 2003 |
| MPS Painting Services Shropshire Limited | Construction | 2022 |
| MPT Enterprises Group Limited | Financial services | 2025 |
| MR Fire Safety Ltd | Administrative & support | 2014 |
| MR Flynn Creative Limited | Professional & scientific | 2018 |
| MR Miscanthus Ltd | Administrative & support | 2016 |
| MR Smooth Plastering Limited | Construction | 2018 |
| MR Tee's Shrewsbury Ltd | Hospitality | 2026 |
| Mrdr Property Limited | Real estate | 2026 |
| MRO Griffiths Limited | Construction | 2019 |
| Mroads Ltd | Extraterritorial | 2019 |
| MS Bespoke Financial Services Ltd | Financial services | 2022 |
| Msass Limited | Professional & scientific | 2013 |
| MSK & SON Ltd | Hospitality | 2020 |
| MSK Services Ltd | Health & social care | 2018 |
| MSM3431PEARLDRAGON Limited | Hospitality | 2017 |
| MSN2628PEARLDRAGON Ltd | Hospitality | 2026 |
| MTB Plastering Limited | Construction | 2021 |
| MTM Aber' Limited | Real estate | 2008 |
| Mtrl Limited | Information & communication | 2014 |
| MTS Shropshire Limited | Manufacturing | 2002 |
| Muckaway Total Cleaning Solutions Limited | Administrative & support | 2021 |
| Muckers Grab Hire Ltd | Water & waste | 2018 |
| Muda Healthcare Services Ltd | Health & social care | 2025 |
| Mulberry Homes Management Limited | Real estate | 2002 |
| Mulberry Homes Railway Inn Management Company Limited | Real estate | 2006 |
| Mullin Dent Removal Ltd | Wholesale & retail | 2018 |
| Mullins Heating Limited | Construction | 2009 |
| MUM and SON Kitchen Ltd | Hospitality | 2026 |
| Mumma's Emporium Limited | Public administration | 2023 |
| Munro Associates (Architectural Services) Limited | Professional & scientific | 2012 |
| Murivance Holdings Limited | Professional & scientific | 2007 |
| Muscleflex Gym Ltd | Arts & recreation | 2023 |
| Muse Bridal Limited | Wholesale & retail | 2015 |
| Muse Educate Limited | Wholesale & retail | 2024 |
| Musecraft Ltd | Wholesale & retail | 2017 |
| Museum Court Freehold Limited | Households | 2013 |
| Museum Court Lincoln Management Limited | Households | 2008 |
| Music & Media Consultancy Ltd | Professional & scientific | 2020 |
| Music Bros Limited | Wholesale & retail | 2009 |
| Music Heroes Instrument Tuition Service LLP | | 2023 |
| Mustard and Gray Ltd | Manufacturing | 2018 |
| MVT Cleaning Limited | Other services | 2018 |
| MW Ground Screws Ltd | Construction | 2026 |
| MW2 (Kinnerley) LLP | | 2016 |
| MWH Carpentry Limited | Construction | 2025 |
| My GAS and Electrics Ltd | Construction | 2021 |
| My Group EOT Limited | Administrative & support | 2025 |
| My Health Xtras Ltd | Financial services | 2018 |
| My Lawyer for Life Limited | Professional & scientific | 2022 |
| My Money Xtras Limited | Financial services | 2019 |
| My Next Group Ltd | Information & communication | 2021 |
| My Next Retreat Ltd | Information & communication | 2025 |
| My PA Global Ltd | Information & communication | 2025 |
| My Property Pros (Leamington Spa & Warwick) Limited | Administrative & support | 2024 |
| My Staff Shop Limited | Administrative & support | 2011 |
| My TAN Studio Ltd | Other services | 2024 |
| My Wealth Coach Limited | Financial services | 2011 |
| My-Com Technology Limited | Professional & scientific | 2002 |
| Myford Window Group Limited | Construction | 2018 |
| MYLAWYER4LIFE Limited | Professional & scientific | 2022 |
| Myndstone Limited | Construction | 2018 |
| Mynurva Limited | Information & communication | 2017 |
| Myshrewsbury Ltd | Information & communication | 2017 |
| Mystique Wellbeing Ltd | Wholesale & retail | 2022 |
| Mytton Mill Developments Limited | Construction | 2015 |
| Mytton Mill Management Company Limited | Households | 2017 |
| Mytton Villa (Shrewsbury) Limited | Households | 1987 |
| N Crane Refrigeration Limited | Manufacturing | 2021 |
| N Lynn & Co. Ltd | Health & social care | 2013 |
| N R K K Properties Ltd | Real estate | 2021 |
| N R T Lorimer Limited | Professional & scientific | 2011 |
| N. Harrison Ltd | Professional & scientific | 2012 |
| N.C.B Media Ltd | Professional & scientific | 2025 |
| N.C.H Services Ltd | Construction | 2021 |
| N.M.O.A Limited | Real estate | 2023 |
| N@M Electrical Installations Ltd | Construction | 2025 |
| Nago Property Developments Ltd | Real estate | 2023 |
| Nagy Pubs Limited | Administrative & support | 2026 |
| Nahash Health Community Interest Company | Education | 2025 |
| NAL Trading and Exports Limited | Wholesale & retail | 2019 |
| Nale Holdings Limited | Real estate | 2021 |
| Nant Cribba Barns Management Company Limited | Households | 2019 |
| Naomi Anna DHT Limited | Health & social care | 2021 |
| Naomi G Events Ltd | Administrative & support | 2023 |
| National 50:50 CIC | Financial services | 2026 |
| National Canopy Ltd | Agriculture & fishing | 2023 |