| Maddog Services Ltd | Other services | 2018 |
| Madewell Enterprises Limited | Other services | 1994 |
| Madgestic Trading Ltd | Wholesale & retail | 2021 |
| MAG RAK Ltd | Manufacturing | 2015 |
| Maggs Day Centre | Hospitality | 1988 |
| Magic Care Ltd | Health & social care | 2020 |
| Magic Moments 3D Farm Ltd | Wholesale & retail | 2025 |
| Magic Plums Holdings Limited | Manufacturing | 2012 |
| Magic Stitch Worcestershire Ltd | Wholesale & retail | 2025 |
| Magic Whiteboard Limited | Wholesale & retail | 2008 |
| Magna Property Solutions Limited | Construction | 2011 |
| Magnetic Field UK Limited | Professional & scientific | 2008 |
| Maheswary & Sons Ltd | Wholesale & retail | 2022 |
| Main Road Motor Company Limited | Wholesale & retail | 2016 |
| Main Street Finance Ltd | Professional & scientific | 2023 |
| Maiseb Limited | Professional & scientific | 2006 |
| Majestic Chauffeurs Ltd | Transport & logistics | 2022 |
| Majestic Systems Ltd | Administrative & support | 2017 |
| Majestic Worcester Ltd | Transport & logistics | 2023 |
| MAK Studios Limited | Information & communication | 2010 |
| MAK TAP Trading Limited | Wholesale & retail | 2020 |
| Make Ends Meet Limited | Wholesale & retail | 2004 |
| Make Waves Swim School Ltd | Education | 2021 |
| Making Tax Digital Hub Limited | Information & communication | 2025 |
| Malko's Fish Bar Ltd | Hospitality | 2020 |
| Malpas Stallard Limited | Wholesale & retail | 1956 |
| Malvern Analytics Limited | Information & communication | 2025 |
| Malvern Bespoke Kitchens Limited | Wholesale & retail | 2021 |
| Malvern Engineers Ltd | Professional & scientific | 2022 |
| Malvern Glass Fabrications Limited | Wholesale & retail | 1983 |
| Malvern Grange (Solihull) Limited | Households | 2007 |
| Malvern Hills Guitars Ltd | Wholesale & retail | 2015 |
| Malvern Hills Water Limited | Manufacturing | 2021 |
| Malvern Medical Group Limited | Manufacturing | 2008 |
| Malvern Motorsport Timing Services Limited | Arts & recreation | 1999 |
| Malvern Pharmaceutical Supplies Limited | Professional & scientific | 1981 |
| Malvern Recycling Ltd | Water & waste | 2014 |
| Malvern Road Worcester Management Limited | Households | 2022 |
| Malvern Saddle Company Limited | Manufacturing | 2004 |
| Malvern Skip Hire Ltd | Water & waste | 2014 |
| Malvern Taxis Agents Ltd | Transport & logistics | 2017 |
| Malvernoak Ltd | Manufacturing | 2023 |
| Malvteq Limited | Information & communication | 2009 |
| Mama Milla Ltd | Professional & scientific | 2009 |
| Management Services Europe Limited | Professional & scientific | 2001 |
| Manfirco Limited | Real estate | 1974 |
| Manford Pension Solution Services Ltd | Administrative & support | 2026 |
| Manifold Limited | Wholesale & retail | 2000 |
| Manik Group Ltd | Information & communication | 2025 |
| Mankamana Limited | Hospitality | 2021 |
| Mann Broadbent Limited | Administrative & support | 2014 |
| Manna Bake House Ltd | Hospitality | 2026 |
| Manor Coach House Apartments Limited | Hospitality | 2018 |
| Manor Coach House BED and Breakfast Limited | Hospitality | 2019 |
| Manor Farm Limited | Agriculture & fishing | 1955 |
| Manor Farm Stoulton Management Company Limited | Households | 1995 |
| Mansels (Sales) Ltd | Administrative & support | 2010 |
| Mansfield Ravenhall Limited | Extraterritorial | 1999 |
| MAP95 Ltd | Administrative & support | 2026 |
| Maple (178) Limited | Households | 2002 |
| Maple (355) Limited | Households | 2009 |
| Maple Tails Limited | Professional & scientific | 2024 |
| Mapped OUT Ltd | Professional & scientific | 2021 |
| Maprium (UK) Limited | Financial services | 2026 |
| MAR Consulting Practice Ltd | Other services | 2023 |
| MAR Group Limited | Transport & logistics | 2021 |
| MAR Securities Limited | Financial services | 2013 |
| MAR2BUILD Ltd | Construction | 2015 |
| Marathon Display Frames Ltd | Manufacturing | 2025 |
| Marathon Energy Limited | Professional & scientific | 2009 |
| Marc Rigg Limited | Information & communication | 2021 |
| Marchwood Marketing Services Ltd | Administrative & support | 2021 |
| Marcin Freight Ltd | Transport & logistics | 2018 |
| Mardy MOO Design Ltd | Professional & scientific | 2024 |
| Marfona Properties Ltd | Real estate | 2021 |
| Margrove Limited | Construction | 2020 |
| Maria's Place Ltd | Hospitality | 2024 |
| Marian Clare Medical Services Ltd | Health & social care | 2025 |
| Mario Caravans & Motorhome Repair and Painting Limited | Manufacturing | 2024 |
| Mariuta Construct Limited | Construction | 2026 |
| Mark a Linley Goldsmith Ltd | Wholesale & retail | 2022 |
| Mark E. Jenkins Building Contractors (Worcester) Limited | Construction | 2013 |
| Mark Evans Software Contractor Ltd | Information & communication | 2016 |
| Mark Lockyer Psychology Services Limited | Health & social care | 2008 |
| Mark Pavey Design & Build Ltd | Construction | 2016 |
| Mark Sheldon Ltd | Education | 2022 |
| Market Quarter Ltd | Real estate | 2002 |
| Market Squares Limited | Extraterritorial | 2001 |
| Marketing + Technologies Group Ltd | Professional & scientific | 2000 |
| Marl Bank Sheet Metal Co. (1977) Limited | Manufacturing | 1973 |
| Marley Estates Ltd | Real estate | 2024 |
| Marley Eternit Limited | Extraterritorial | 2018 |
| Marlin Selection Ltd | Administrative & support | 2009 |
| Marrakushi 101 Limited | Construction | 2019 |
| Marrakushi 211 Limited | Construction | 2019 |
| Marrakushi Limited | Real estate | 2019 |
| Marriott Nutrition Ltd | Arts & recreation | 2020 |
| Marsh Trust Limited(The) | Real estate | 1935 |
| Marshalls Distribution Ltd | Wholesale & retail | 2026 |
| Marshalls Stone Driveways Limited | Construction | 2019 |