Unless you've been living under a rock, you already know that famed investor Warren Buffett has been selling Apple (NASDAQ: AAPL) stock by the boatload. His holding company, Berkshire Hathaway, has made several sales of the tech king over the past few months,

It is indeed interesting that Berkshire now holds $320 billion in cash vs just $272 billion in equity investments. Put another way, Buffett is holding more cash than stocks. "That’s a lot of firepower if markets see a sustained drop," notes Colas. "While Berkshire is not especially expensive, its multiple may be worrisome to a value investor ."

Nearly $193 billion of the $313 billion investment portfolio Warren Buffett oversees at Berkshire Hathaway can be traced to four market-leading businesses.