When Warren Buffett's Berkshire Hathaway makes big moves in the market, this time for selling off a portion of its Apple stock, investors tend to notice. The move has sparked interest and

In other words, history has shown that when Buffett's prized valuation tool moves well beyond the bounds of its long-term average, trouble follows for Wall Street. This may be why the Oracle of Omaha has been a net seller of stocks for eight consecutive quarters at Berkshire Hathaway, to the tune of $166.2 billion.

Shares of healthcare company DaVita (DVA) are down 11% on reports that Warren Buffett has reduced his holding of the stock.Maximize Your