Warren Buffett has long complained that Berkshire Hathaway BRK.A BRK.B has become so huge that it’s difficult to find acquisitions that are both undervalued and large enough to make a material difference to the company’s bottom line.

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.

Close followers of Warren Buffett told BI they want him to discuss the impact of tariffs, why he's hoarding so much cash, and his retirement plans.