When you survey the thousands of companies in the stock market, looking for an investment that might build your wealth over the long term, give some consideration to Warren Buffett's company, Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B).

(Reuters) -Class A shares of Warren Buffett's Berkshire Hathaway fell 3% in afternoon trading on Monday, as investors fretted over a $3.8 billion write-down and a dip in quarterly operating profit that the firm disclosed on Saturday.