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 .

A look at how Berkshire’s stock — and its equity holdings — have fared ahead of the annual shareholders meeting on Saturday