Warren Buffett's Berkshire Hathaway saw the value of its Apple stock tumble as much as $19 billion in two days.<br />On Thursday, Apple's stock price dropped 8%.<br />On Friday, Apple dropped as much as 7%.<br />That cut the value of Berkshire's roughly 981 million shares in the tech titan to below $110 billion.<br />Berkshire has still more than tripled the value of its Apple investment, as it spent about $35 billion to build the 5.7% stake.<br />Berkshire Hathaway's Apple stake is still worth more than the market capitalization of Citigroup or Starbucks.
