CarMax Earnings More Than Triple By: MarketMinute.com Stock News June 23, 2010 at 12:42 PM EDT First quarter earnings for CarMax Inc. (NYSE: KMX) more than tripled to 44 cents per share from 13 cents per share a year earlier to surpass analyst estimates by a wide margin. Shares of the used car retailer climbed $1.60 to $21.60. Related Stocks: CarMax