Warren Buffett's Berkshire Hathaway hit a new milestone today (Monday) in a descent that had already put the stock into a 'bear market.'
The class A shares closed exactly 25 percent below the all-time high set last December.
Today's closing price of $111,900 each is the lowest for the stock since August 15, almost one year ago.
Berkshire is down 21.0 percent in 2008, underperforming the benchmark S&P 500 stock index, which has dropped 15.9 percent this year.