Charlie Munger, the billionaire vice chairman of Berkshire Hathaway, owns a 3 percent stake in Costco Wholesale Corp.
Munger has been a director at Costco since December 2004 and his wife, Nancy Munger, is also a member of the board.
At Berkshire's annual shareholders meeting in May 2018, Charlie Munger said that he thinks Costco is one of the two or three most admirable retailers in America.