Both classes of Warren Buffett's Berkshire Hathaway marked the first day of trading today for the just-split Class B stocks with their biggest one-day percentage gain since last August.
Both the Class A and Class B stock ended the day at their highest levels since early November, 2008.
The A shares closed today with a gain of 4.5% at $108,850. After three straight days of strong gains, they're up 11.6 for the holiday-shortened week.
The Baby Bs finished 4.6% higher today at a post-split price of $72.72. They've gained 13.6 percent this week.
Volume for the Class B shares hit 14.5 million shares in today's session. That compares to a 10-day average of 65,100 shares when the stock traded at its pre-split price of over $3000.