WARREN BUFFETT'S BERKSHIRE HATHAWAY SOLD ITS $1.3 BILLION COSTCO STAKE LAST QUARTER. HERE'S WHY THAT'S SURPRISING

© REUTERS/Rick Wilking Warren Buffett and Charlie Munger REUTERS/Rick Wilking Warren Buffett's Berkshire Hathaway sold its Costco position after investing more than 20 years ago, a filing revealed this week.The billionaire investor's company grew its stake in the big-box retailer from 355,000 shares worth $32 million in 1999, to 4.3 million shares worth $1.3 billion in June of this year....