Based or created in MN (M-N)

• Magnepan (White Bear Lake) - makes speakers for audiophiles
• magnetic poetry (Minneapolis) - writer's block turns into entrepeneurial gold; check your fridge
• Malt-O-Meal (Northfield) - roots as a hot wheat cereal company in 1919
• Manhattan Group (Minneapolis) - toy maker of the popular Groovy Girls
• Mariner Software (Minneapolis) - produces alternatives to Microsoft Office for the Mac platform
• Mar-O-Bar Company (Minneapolis) - started in 1920 and introduced the Milky Way chocolate bar in 1923. See Frank Mars
• Masking Tape (St. Paul) - 3M engineer Richard Drew invented it in 1925.
• McKnight Foundation (Minneapolis) - one of the largest American philanthropic foundations
• Medtronic (Fridley) - world's largest company in medical technology
• Minnesota Multiphasic Personality Inventory (MMPI) (Minneapolis) - widely used test of adult psychopathology
• Minnesota Public Radio (St. Paul) - largest producer of national public radio programs
• Minnetonka Moccasin (Minneapolis) - the private footwear company began in 1946; most popular style is the Thunderbird
• MoneyGram (St. Louis Park) - Travelers Expresss, founded in 1940, bought the 2nd largest money transfer in the world in 1998 and renamed itself in 2005
• Music Go Round (Minneapolis) - franchise for used musical instruments. See Winmark
• Musicland Group (Minnetonka) - owns Sam Goody, Suncoast and MediaPlay stores
• Mystery Science Theater 3000 (Eden Prairie) - the tv show on Minnesota's public access channel became a cult hit
• Nada-Chair (St. Paul) - makes back-supporting slings for sitting
• National Arbitration Forum (Minneapolis) - alternative dispute resolution provider
• Nobel Peace Prize Forum (various) - an annual collegiate event with cooperation from the Norweigan Nobel Institute
• Nordic Track (Excelsior) - inventor Ed Pauls filed for a patent in the mid 70s
• Northwest Airlines (Bloomington) - first major airline to ban smoking on international flights
• Nutrisoda (Minneapolis) - a line of nutrient-infused sodas from Ardea Beverage Co.