| Lyonsdown Limited | Information & communication | 2006 |
| Lythwood Sheep Limited | Agriculture & fishing | 2009 |
| M & B Motor Services Ltd | Wholesale & retail | 2017 |
| M & C Management Consultants Limited | Professional & scientific | 2010 |
| M & I Plastering Contractors Limited | Construction | 2004 |
| M & J S Consulting Ltd | Information & communication | 2005 |
| M & JC Gould Limited | Agriculture & fishing | 2002 |
| M & M Energy Limited | Financial services | 2017 |
| M a Bowering Limited | Professional & scientific | 2021 |
| M C and M Solutions Limited | Health & social care | 2015 |
| M C Carpentry & Joinery Limited | Construction | 2007 |
| M C Edwards Building Services Limited | Construction | 2018 |
| M Coetsee Ltd | Other services | 2023 |
| M D Shropshire Construction Ltd | Administrative & support | 2021 |
| M E Tong Limited | Agriculture & fishing | 2013 |
| M Entwistle Ltd | Information & communication | 2019 |
| M G Lawncare Limited | Administrative & support | 2019 |
| M Harvey Homes Ltd | Real estate | 2022 |
| M Hedges Co Limited | Professional & scientific | 2021 |
| M J Baines Veterinary Limited | Professional & scientific | 2017 |
| M J Owen Plumbing & Heating Limited | Other services | 2021 |
| M J Parker Ltd | Agriculture & fishing | 2014 |
| M J Refrigeration Group Ltd | Financial services | 2018 |
| M N Newall Limited | Professional & scientific | 2006 |
| M SON Pet Supplies Limited | Professional & scientific | 2016 |
| M T Wilde Plant Services Limited | Construction | 1988 |
| M V Mortgages Limited | Financial services | 2020 |
| M W Carpentry (Shropshire) Ltd | Manufacturing | 2023 |
| M W Knight and Sons Limited | Construction | 1988 |
| M&K Properties Ltd | Real estate | 2016 |
| M&V Patel Ltd | Wholesale & retail | 2019 |
| M. J. Jones Electrical Ltd | Construction | 2011 |
| M.A.N.T. Limited | Construction | 2002 |
| M.J. Refrigeration Sales & Rental Limited | Wholesale & retail | 2024 |
| M.J. Refrigeration Transport Limited | Transport & logistics | 2003 |
| M.R. Munro Ltd | Professional & scientific | 2012 |
| M.S.Walker Limited | Real estate | 1959 |
| M2M Windows Ltd | Construction | 2021 |
| M6TT W Limited | Wholesale & retail | 2014 |
| M73 Limited | Hospitality | 2024 |
| MA Financial Planning Ltd | Financial services | 2017 |
| MA Vehicle Sales Limited | Wholesale & retail | 2020 |
| MAC1 Electrical Ltd | Construction | 2008 |
| Macadam Surfacing (Midlands) Limited | Construction | 1980 |
| Maccarigging Ltd | Information & communication | 2022 |
| Machin Electrical (Services) Ltd | Construction | 2010 |
| Macquarrie Enterprise Limited | Wholesale & retail | 2023 |
| MAD Badger Brewery Limited | Agriculture & fishing | 2023 |
| Maddocks Grange Management Company Limited | Households | 2011 |
| Maddox and Co Shrewsbury Ltd | Other services | 2020 |
| Madewell Developments Limited | Information & communication | 1998 |
| Madwire Ltd | Information & communication | 2016 |
| Mae-Rose Corporate Events Ltd | Administrative & support | 2023 |
| Maelor Homes (Bankhouse) Limited | Construction | 2022 |
| Maelor Homes (Hinton) Limited | Construction | 2022 |
| Maelor Homes (Pontesbury) Limited | Construction | 2021 |
| Maelor Homes Limited | Construction | 2021 |
| Maesbrook 1964 Limited | Extraterritorial | 2013 |
| Maesbrook Care Home Ltd | Health & social care | 2006 |
| Maesbrook Home Care Ltd | Health & social care | 2023 |
| Maesbrook Road PO Limited | Wholesale & retail | 2022 |
| Maestro's Blade Ltd | Other services | 2022 |
| Magda Multan Home Ltd | Manufacturing | 2024 |
| Magic Minutes Limited | Information & communication | 2016 |
| Magna Furniture Components (UK) Limited | Wholesale & retail | 2005 |
| Magrathea Holdings Ltd | Financial services | 2023 |
| Mahim Indian Takeaway Limited | Hospitality | 2018 |
| Mail House Mailing Services Ltd | Manufacturing | 2010 |
| Maine Place Management Company Limited | Administrative & support | 2008 |
| Mainland Education Limited | Education | 2012 |
| Maioflor Ltd | Information & communication | 2026 |
| Maiseler Lettings Limited | Hospitality | 2021 |
| Maisie MOO Gifts Limited | Wholesale & retail | 2013 |
| Maisie's Dresses Limited | Wholesale & retail | 2025 |
| Maison Femme Group Ltd | Education | 2025 |
| Maistro Limited | Information & communication | 2012 |
| Maistro UK Limited | Information & communication | 2007 |
| Maiva Motor’S Ltd | Wholesale & retail | 2024 |
| Major Properties (Shrewsbury) Limited | Real estate | 1951 |
| MAK Design Ltd | Other services | 2019 |
| Makespace Arts & Well-Being CIC | Education | 2019 |
| Makmarine Limited | Manufacturing | 2007 |
| Malehurst Farm Ltd | Agriculture & fishing | 2025 |
| Malin Court Property Management Ltd | Households | 2022 |
| Malt House Barn Ltd | Hospitality | 2019 |
| Malthouse Veterinary Group Limited | Professional & scientific | 2016 |
| Maltings Court (Burton) Management Company Limited | Households | 2005 |
| Maltings Management Company (Braintree) NO.1 Limited | Households | 2001 |
| Malton Foods Limited | Manufacturing | 2005 |
| Malvern View Management Limited | Households | 2004 |
| Mama's Cottage Mushrooms Ltd | Wholesale & retail | 2023 |
| Mammoth Consulting & Coaching Limited | Health & social care | 2019 |
| Mangel Ltd | Extraterritorial | 2017 |
| Manor Farm Court Management Company Limited | Administrative & support | 2004 |
| Manor Farm Management (Bardney) Limited | Households | 2004 |
| Manor Farm Weedon Management Company Limited | Real estate | 2013 |
| Manor Green (Holmes Chapel) Management Company Limited | Real estate | 2017 |
| Manor Road (Dorridge) Management Limited | Households | 2003 |
| Manor Walk (Thaxted) Management Company Limited | Real estate | 2022 |
| Manorfields Farm Limited | Agriculture & fishing | 2018 |