Warren Buffett’s net worth has risen by $15 billion this year, due in part to an extraordinary earnings report from Berkshire Hathaway.

Berkshire Hathaway has been building up its cash position to its highest-ever levels over the past two years, and that sends some clear messages about what Buffett's thinking about the market. Combined with his net sales of stocks, he seems to think there aren't so many great deals to be had in the market.

Warren Buffett's Berkshire Hathaway nearly doubled its cash pile to $334 billion, sold a net $134 billion of stocks, and paid $26.8 billion to the IRS.