Shares of Warren Buffett's Berkshire Hathaway scored their biggest one-day gain in a year, with a lot of help from today's powerful overall stock market rally.
Berkshire Class B shares, now in the benchmark S&P 500 stock index, closed 5.1 percent higher at $78.23. That's their best day since April 29, 2009.
The six-figure Class A shares jumped by 5.2 percent to finish at $117,290 each, for their biggest one-day gain since March 26, 2009.