Investors often use Berkshire Hathaway's quarterly-filed Form 13Fs to track Warren Buffett's trading activity. Buffett has been a net seller of stocks for nine consecutive quarters, which has ballooned Berkshire's cash pile to $334 billion.

Tens of thousands of people will descend on Omaha, Nebraska, to attend the annual shareholder weekend for billionaire Warren Buffett's Berkshire Hathaway. Buffett, 94, is expected to answer shareholder questions over four and a half hours at Berkshire's annual meeting on Saturday.

CEO Warren Buffett, known as the Oracle of Omaha, is among the greatest living investors. Because Berkshire Hathaway has delivered outstanding long-term returns for its shareholders, the company’s imminent earnings release will be a closely watched and highly anticipated event.