CEO Warren Buffett speaks, the whole of Wall Street pays close attention. Delivering an aggregate return of more than 5,180,000% in Berkshire's Class A shares (BRK.A) since becoming CEO in 1965, and effectively doubling up the annualized total return of the broad-based S&P 500 spanning almost six decades,

The Berkshire Hathaway CEO is hunkering down by selling stocks and raising cash for the conglomerate, raising questions about whether he is souring on the outlook for the stock market and economy. The big news this morning in Berkshire’s financial report for the second quarter was a nearly 50% reduction in the size of Berkshire’s Apple stake to about 400 million share–as well as the sharp rise in total cash levels to a record $277 billion on June 30,