Mills and milrays are fractions of one cent (which is 1/100 of a US Dollar) 10 milrays equal one mill 10 mills equal one cent Most stock traders here are not familiar with these terms because almost all “normal” stocks trade in dollars. Some stocks called “penny”stocks are defined as stocks trading under five DOLLARS. There are very few recognized stocks trading in the milrays, yet only one or two milrays at that.