Anthropologists studying the cultural habits of a certain type of American investor could do no better than to join the thousands who make the annual pilgrimage to Omaha, Neb., where Warren Buffett's Berkshire Hathaway Inc.

Berkshire Hathaway investors are eager to hear CEO Warren Buffett hold forth at length about the company on Saturday. It may be one of the last such opportunities to do so.

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.